bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis on Primary Frequency Regulation Function Tests for Thermal Power Units
Authors: Kang Li Jie , Liang Wei Ping
Published: July 2014

With the increase of the load capacity and the development of the automation degree, the power dispatching center has a higher requirement for the primary frequency regulation function of the unit aircrew. After a certain period of time when the unit has been put into operation, the primary frequency regulation function must have the conditions to be put into operation, so that the unit can be involved in grid frequency at any time when the conditions are satisfied and the power supply quality can be fully guaranteed [1]. The regulation performance of primary frequency regulation plays a vital role in maintaining the stability of the unit aircrew and the power grid, so it is very necessary to conduct the frequency tests for the thermal power units [2]. In this paper, we describe the disturbance tests and recovery tests under different load points and different network frequencies. Through the analysis, we can draw the conclusion that the primary frequency regulation function of unit 1 can fully meet the requirement of the frequency regulation of the power grid.
Application of Special Optical Fiber Sensing Technology in New Generation of Smart Substation
Authors: Yang Rui Rui , Yang Hui Yuan , Ou Wei Chi
Published: July 2014

The new generation of smart substation puts forward higher requirements to sensing technology. Based on the needs of these requirements, four kinds of special optical fiber sensing technology in power systems were researched: all-optical current transformer, distributed temperature sensing technology, fiber grating vibration sensing technology and fiber Bragg grating sensing technology. These kinds of optical fiber sensing technology for the new generation of smart substation to enhance its performance were analyzed. Finally, based on the fiber Bragg grating sensing technology, the online oil and winding temperature monitoring system was constructed for the new generation of smart substation.
Development of Engine Exhaust Active Noise Control System
Authors: Wang Jie , Liu Zhi En , Zeng Jia Wei , Wang Chao
Published: July 2014

In order to enhance the capacity of elimination of engine exhaust low frequency noise, a set of engine exhaust active noise control system was developed. The system was developed by using MC9S12XS128 MCU, and it is based on the theory of sound wave interference. The system can realize the voice signal acquisition, reverse phase processing and output, and can eliminate engine exhaust low frequency noise. Experimental results showed that the system has good silencing effects on the engine exhaust noise under the steady state.
Coordinated Control of Variable-Speed Constant-Frequency Wind Farms in Weak Grids
Authors: Li Chao , Wang Hong Tao , Wei Zhong Kang , Wang Chun Yi
Published: July 2014

Variable-speed constant-frequency (VSCF) wind farms are gradually becoming a significant proportion of generation in weak grids with constantly increasing penetration rate, and it should certainly take responsibility of the grid frequency and voltage stability. Based on the P-Q performance curve of doubly fed induction generator (DFIG), by introducing static synchronous compensator (STATCOM), this paper presents a coordinated control strategy of active power and reactive power to deal with fault and load disturbance in weak grids. Simulation results show that the proposed coordinated control strategy can effectively improve the frequency and voltage stability of the grids.
Development and Application of Power Transformer Oil Purifier in Line
Authors: Wang En Lu , Wang Qing Hao , Zhao Chuan Zong , Zhang Wen Guang , Huang Yan Hai , Liu Chuan Bo , Liu Xiao , Zhang Xiao Shu , Tong Rui , Zhang Hua
Published: July 2014

Power transformer oil purifier described in this article is equipment that filters charged transformer oil in running transformers. Transformer oil can be filtered on line to improve performance of the transformer oil. This article analyzes the necessity of the purification and filtration on processing power transformer oil, describes the overall design ideas of oil purifier in line. Through examples, power transformer oil purifier in line is further discussed the steps and precautions in the application. By comparing the power outage transformer oil purifier and oil purifier in line, the superiority and science of oil purifier in line are clarified.
Research of Combined Optimum Grey Model to Mid and Long Term Electric Load Forecasting
Authors: He Xiang Shuo , Yang Li , Yu Xiao Na
Published: July 2014

It is well known that mid and long term electric load forecasting has many uncertain factors that influence the forecasting precision greatly, so every forecasting method has its limitation. Considering limitations of basic grey model and conventional improved models, a new practical method called combined optimum grey model for mid and long term load forecasting is introduced. The combined model is composed of partial error optimum grey model (GM) as well as equa-l dimension and new-information grey model. The forecasting algorithm can estimate model parameters, meet the requirements of dynamic power load and overcome random disturbances. Example analysis shows that the forecasting error is below 3 percent. Compared with conventional theoretical methods, the proposed scheme has the characters of simple computation, high forecasting precision and good applicability.
The Key Parameter Modeling of SiC MOSFET
Authors: Peng Yong Long , Li Rong Rong , Li Ya Bin
Published: July 2014

This thesis mainly analysed the internal relations between parameters of SiC MOSFET and its dynamic and static characteristics respectively. And furthermore, a new method for modeling of SiC MOSFET based on PSpice was proposed in this paper. By introducing voltage’s controlling for voltage source E, we can compensate and correct the difference between PSpice default value of gate threshold voltage and actual value. At the same time, we can adopt two different junction capacitance models to describe the changes of junction capacitance which were brought about by the difference of the terminal voltage. In the meanwhile, there are newly increased source-drain resistance of MOSFET and gate resistance with the temperature change of variable temperature sub models. New models are able to fully and accurately reflect SiC MOSFET’s static and dynamic characteristics. Moreover, it provides an important foundation for switch process analysis of SC MOSFET, loss calculation and main circuit design. The fact that the experimental testing result is highly coincident with the simulation results verifies the correctness and accuracy of the models.
A Meshless Method for Solving the Mathematical Model Associated the Leakage Problem in Gas Pipeline
Authors: Li Jun Shan
Published: July 2014

In this paper, we propose a meshless method for solving the mathematical model concerning the leakage problem when the pressure is tested in the gas pipeline. The method of radial basis function (RBF) can be used for solving partial differential equation by writing the solution in the form of linear combination of radius basis functions, that is, when integrating the definite conditions, one can find the combination coefficients and then the numerical solution. The leak problem is a kind of inverse problem that is focused by many engineers or mathematical researchers. The strength of the leak can find easily by the additional conditions and the numerical solutions.
An On-Line Monitoring Method of Interharmonics Based on ANF and Interpolated FFT
Authors: Wang Jian Xun , Deng Hai Hua
Published: July 2014

To detect interharmonics whose amplitudes are often small, a detection method based on ANF and interpolated FFT is proposed. In the method, the parallel structure of the ANF (adaptive notch filter) is firstly used to detect the fundamental and harmonic components, in which the fundamental frequency signal with high amplitude is detected with the main ANF and then the measured base frequency is output to sub-parallel ANF structure so as to extract the harmonic components. Then a separated interpolated fast Fourier transformation (FFT) analysis of interharmonic components will be effectively completed without the influence of the fundamental and harmonic components. A detection platform based on the proposed method is implemented in LabVIEW. The results of simulation and experiments show the effectiveness of the method.
Application of Wavelet Analysis to Eddy Current Testing for the Surface Fatigue Crack of Bolt Holes
Authors: Li Xiao Li , Sun Jin Li
Published: July 2014

Eddy current testing is one of the five major routine nondestructive testing methods and it is convenient, fast and suitable for online detecting of the surface fatigue crack of bolt holes. However, the signals of eddy current testing are so weak that it is difficult to identify the signals. So more effective signal processing method must be adopted to deal with the weak signals. This paper used the wavelet analysis to process signals of the eddy current testing for the surface flaw of bolt holes. It can inhibit the noise and reinforce signal and make qualitative testing possible for quality evaluation of the surface fatigue crack of bolt holes.
Design of High-Gain Amplifier for Soft X-Ray Imaging Diagnostic System on J-TEXT Tokamak
Authors: Xiao Zheng Yu , Zhang Xiao Qing , Ding Yong Hua , Li Jian Chao
Published: July 2014

Amplifier is a key component of the Soft X-ray imaging diagnostic system and the system is one of the most important diagnostic systems on J-TEXT tokamak. Signal generated by the photodiode is current and it’s too small. A high-gain amplifier enable us to observe the soft x-ray radiation signal in J-TEXT tokamak accurately. So an amplifier based on transimpedance circuit was proposed. Through theoretical calculations and simulations, the designed amplifier can achieve the set goals that are the V/I gain of 106 and the bandwidth of 20KHz. In order to ensure the quality of the signal, interface and shell of the amplifier are designed specially. Finally designed amplifier works properly in the experiment and it can meet the needs of the experiment.
Impacts on Water Consumption in Wet Flue Gas Desulfuration
Authors: Xiao Hai Ping , Dong Lin , Han Gao Yan , Ning Xiang
Published: July 2014

Material balance calculation was adopted to a bubbling desulfurization system of 600MW unit for water-saving measures. Analysis was made on main factors affecting water consumption. Results showed that heat release of desulfurization reaction and water evaporation went up with sulfur content increasing; Free water and bound water in gypsum increased rapidly with calcium improved; When sulfur content enhanced from 0.5% to 3.5%, water evaporation of reactor increased by 28.9% and waste water increased by 7.8%; With inlet flue temperature of WFGD raised from 120°C to 200°C, waste water increased by 25.3% and evaporation of water increased by 102.35%; Once gas-gas heater (GGH) was installed, heat release of original flue gas decreased by 43.72% and the total water consumption decreased by 39.06%. Therefore, with sulfur content and temperature of inlet flue increasing, water consumption raises. Installation of gas-gas heater (GGH) can effectively reduce water consumption of WFGD system.
Research of Fault Monitoring and Early Warning Technology of Optical Cable
Authors: Zhang Gang , Liu Chuan , Ren Jie , Zhang Zeng Hua , Chen Wei
Published: July 2014

Electric power optic cables, as infrastructure facilities of the power communication system, are commonly affiliated to primary towers and poles of power transmission lines. And their safe and stable operation is one of important factors to guarantee the reliable power supply. At present, there are many kinds of professional application systems for equipment management in the field of Power System, so the level of their automation and intelligence is relatively high. But Management and Monitoring of outdoor lines are still staying the same as traditional methods, becoming a vulnerable part in smart grid. This paper introduces a network management system of electric power optic cables based on GIS and referred to the design method of Transmission Network Management System (TNMS). Its aims and several main developing technologies are also discussed. This system will play an important role in improving maintenance management and operational reliability for the power communication network.
Research of Process Procedures in Lighting Impulse Measurement Software
Authors: Liu Shao Bo , Li Weng Ting , Zheng Yan , Long Zhao Zhi , Zhang Shu Han
Published: July 2014

According to the new processing requirements of lightning full-wave with oscillation in IEC60060-1 Ed.3.0, a impulse measurement calculation program based on Labview has been designed. The method of starting point determination and curve fitting has been introduced. Ordered sample mean clustering thinking was used to find the chopping point of lighting impulse tail-chopping waveform. Waveforms in TDG(test data generator)2.0.6 in IEC61083-2Ed2.0 were used to check the accuracy of the calculation program. The uncertainty of test results has also been estimated. Test results show that this calculation program meets the requirements in IEC61083-2. When the calculation program was used with oscilloscope or data capture card,the accuracy of impulse measurement system can be ensured. It is of significant importance in impulse measurement research.
Research on High Bandwidth Rogowski Coil for Measuring Lightning Traveling Wave Current on Double Circuit Transmission Line
Authors: Yang Cheng Ju , Zhang Cheng Wei , Zhang Geng Bin , Chen Pei Ling , Xie Shi Jun
Published: July 2014

Double circuit transmission line is an important part of the power grid, which is vulnerable to lightning and may endanger the security and stability of the power grid. In order to design a sensor which can monitor the lightning traveling wave current on double circuit transmission line, simulations of lightning on the double circuit transmission line were conducted. The simulation result shows that besides high frequency components, the traveling wave contains a lot of low frequency components. Based on the equivalent model and the frequency response of the self-integrated Rogowski coil, it turns out that the widely used self-integrated Rogowski coil is not suitable for this application as the problem of low frequency distortion. In this paper, through theoretical analysis and simulations in Matlab, an improved Rogowski coil with analog integrator is proposed which can correct the low frequency distortion of the self-integrated Rogowski coil. All the simulations, experiments and operating data installed to a double circuit transmission line in China verify the validity of the high bandwidth Rogowski coil.
Color Tunability of Blue Phosphors by Changing Cations for Near-UV InGaN-Based Light-Emitting Diode
Authors: Zhu Yi Wen , Hu Fen Fen , Zhou Mei Li , Chen Ping , Wang Zheng Liang
Published: July 2014

The serials of blue phosphors, CaAl2Si2O8: Eu2+ doped with different content Sr2+ and Mg2+ ions, were prepared by solid-state reaction at high temperature. And their structure and photo-luminescent properties were investigated. In Ca0.96-ySryAl2Si2O8: 0.04Eu2+ (y = 0.10, 0.30, 0.50, 0.70, 0.90) system, for y ≦ 0.03, all the compositions crystallize in triclinic structure of CaAl2Si2O8, and on further increase of y, the system undergoes a compositionally induced phase transition from triclinic to monoclinic structure. For Ca0.96-yMgyAl2Si2O8: 0.04Eu2+ (y = 0.10, 0.30, 0.50, 0.70, 0.90) system, for z ≦ 0.03, all the compositions are of triclinic structure of CaAl2Si2O8. With the further increase of z, other phase appears. The emission spectra of these phosphors show blue shift with the introduction of Sr2+ ions, and red shift with Mg2+ ions. The reason may be due to the difference ionic radii of Mg2+, Ca2+, Sr2+. These phosphors show excellent blue emission and broad excitation band in near-UV (ultraviolet) range. They may be potential phosphors for near-UV light-emitting diodes (LEDs).
Metal-Semiconductor-Metal Ultraviolet Photodiodes Fabricated on Bulk GaN Substrate
Authors: Xie Feng , Yang Guo Feng , Wang Jun , Wang Guo Sheng , Song Man , Wang Tang Lin , Wu Hao Ran , Guo Jin
Published: July 2014

We report the demonstration of a GaN-based planar metal-semiconductor-metal (MSM) ultraviolet photodetector (PD). The MSM PD with semitransparent interdigitated Schottky electrodes is fabricated on low-defect-density GaN homoepitaxial layer grown on bulk GaN substrate by metal-organic chemical vapor deposition. The dislocation density of the GaN homo-epilayer characterized by cathodoluminescence mapping technique is ~5×106 cm−2. The PD exhibits a low dark current density of ~4.1×10−10 A/cm2 and a high UV-to-visible rejection ratio up to 5 orders of magnitude at room temperature under 10 V bias. Even at a high temperature of 425 K, the dark current of the PD at 10 V is still <1×10−9 A/cm2 with a reasonable UV-to-visible rejection ratio more than 3×104, indicating that such kind of PDs are suitable for high temperature operation.
The Research on the Integrational Measurement Device of Grounding Resistance
Authors: Li Bo , Pang Yan Jun , Li Jian Feng , Li Ying , Ge Chang Xin , Shan Yi , Wang Qing Hao , Hai Tian Shu , Li Zhi , Li Yi Ran
Published: July 2014

Measuring grounding resistance is the only basis to judge the grounding of electrical equipment is good or not. Aim at the trouble on retracting and releasing of the current lead wire and voltage lead wire;the insecure connection Lead wire and grounding resistance tramegger、grounding crooked chisel and so on;The hectic trouble such as placing or picking the grounding resistance testing equipment, we developed the integrational measurement device of grounding resistance. It mainly introduces the structure and design principle of the device, and provides the related technical essentials. Combined with the actual application,and demonstrates its convenience and flexibility by the force of contrast; Through the case analysis, fully demonstrates the device is feasible、creative and rationality.
The Application of Rogowski Coil in Power System
Authors: Wang Qing Hao , Zhang Yun Shan , Zhang Wen Guang , Li Zhi , Zhang Ning , Li Yan , Wang Zhi Xu , Cheng Peng Fei , Lin Bin , Li Jian Feng
Published: July 2014

The traditional current transformer measurement device cannot meet the requirements of the rapid development in the current power system because of the outdated structure while the Rogowski coil has significant advantages. This article introduces some applications of Rogowski coil in power system. Now the research and application of Rogowski coil current transformer has become one of the most important research directions. Rogowski coil today has been widely used in electric power system.
A Compound Positioning and Splitting Criterion for Power System Oscillation Center with Predicting Function
Authors: Jiang Su Na , Zhou Yu Xiao , Song Dun Wen , Hao Jian Hong , Bin Hong , Qin Zhao Lei
Published: July 2014

In this paper, an oscillation center fast positioning method and the criterion that determines whether a system is out-of-step are combined together to put forward a compound oscillation center positioning and splitting criterion with predicting function. Simulation of a classical numerical example of four-machine system in two regions and an actual example of central China-north China power grid proves that this method can pre-locate lines where oscillation center lies after out-of-step operation of the system when the system is oscillating intensely but still keeps synchronized.
A New Autonomous Chaotic System and its Circuit Simulation
Authors: Chen Heng , Lei Teng Fei , Meng Jing , Wang Rong
Published: July 2014

In this paper, a new chaotic system is constructed. This system contains four parameters and two nonlinear terms. The fractal dimension and the heteroclinic orbit are analyzed in the system. Meanwhile, the circuit of the chaotic system is designed by using Mutisim software. The conclusion confirms the consistency of the numerical simulation and circuit. Because of the above properties, the proposed system has a wide application in such as weak signal detection secure communications and secure communications.
A Voltage Regulator Circuit for Low Power Flash Memories
Authors: Zhang Hua
Published: July 2014

A voltage regulator circuit for low power flash memories is presented. The voltage regulator circuit was implemented in a flash chip realized with a 0.18 um flash technology. Experimental results show that standby current is less than 0.3 μA at 1.8 V and 25 °C.
Research on a Battery Balancing Method for Lithium-Ion Battery Pack of Electric Vehicle
Authors: Chen Yi Ning , Gui Yu , He Hong
Published: July 2014

As the key technology of the electric vehicle, more and more research on battery management system has been done. And the balancing technology is the important part of battery management system. In this paper, a multi-inductor balancing method based on the Buck-Boost topological structure is used to improve batteries’ inconsistencies by obtaining parameters of the battery pack in real time. The proposed balancing method can improve batteries’ inconsistencies so as to increase the capacity utilization rate of the battery pack and prolong the battery lifespan. And in this paper a series of bench experiments were done to examine the effectiveness of the balancing method.
Calculation and Analysis of Three-Phase Transformer Short-Circuit Current
Authors: Pan Pei Ming , Lian Huan , Hui Fei Xiang , Tan Wei Pu
Published: July 2014

Analysis the important significance of transformer short-circuit current calculation for the stable operation of power system. Lead to three different types of transformer short-circuit current calculation methods, this literature uses a simplified example to compare the characters among three methods. Meanwhile, calculation by using the theory to get a quantitative range of simplified method. The calculation results and theory support each other, finally, summarizing the application range of the three methods, and offering a reference for reasonable selection of short-circuit current methods.
Conformation Optimization Based on Impulse Grounding Resistance for Ground Electrode of Power Lines
Authors: Ge Guang Zu , Tang Bo , Qu Zi Hang , Li Yu , Chen Bin
Published: July 2014

Reducing tower ground’s impulse grounding resistance can prevent the power lines from lightning effectively. The concept of impulse grounding resistance is described. Calculation formula of the impulse grounding resistance for ground electrode in different Conformations is derived with impulse coefficient method. The conformation of the ground electrode is improved according to the theory of impulse grounding resistance is decreased when the effective area of the electrode is reduced, using ETAP for simulation of the improved ground electrode. The results show that the impulse grounding resistance of the improved ground electrode can be reduced to 41.1% of the original, and safety margin is larger in practical engineering.
Investigation on Polarity of TiO2 Varistor Using Impedance Spectroscopy and the Frequency Effects
Authors: Zhang Xiao Wen , Chen Er Wei
Published: July 2014

Current-voltage (I-V) and impedance spectroscopy are employed to investigate the polarity of TiO2varistor. It is found that TiO2varistor shows typical polarity behavior, i.e., theI-Vcurve is asymmetric, the impedance slightly increases, and the capacitance slightly decreases when the bias voltage reverses. The effects of measuring frequency on impedance spectroscopy are systematically investigated. The results indicate that TiO2varistor behaves considerable polarity under low sweeping frequency. High sweeping frequency (over 103Hz) counteracts the polarity behavior. A model ofmicro-polarized zoneis tentatively proposed to clarify the polarity behavior of TiO2varistor.
Lossless Compression of Weak Electrical Signal of Ginseng Molecule Based on Discrete Wavelet Transform and Siesta Program
Authors: Li Chang Cheng , Yin Lai Wu , Chen Dong , Xu Shu Jie
Published: July 2014

This paper proposed the electron density of time series by using the Siesta software to calculate the weak electrical signals of ginseng molecule, combining with the lifting scheme DWT to remove ginseng molecular spatial redundancy. For the acquisition and identification of weak electrical signals of ginseng molecule in physical environment , based on the analysis of collection and identification’s principles, the noise coefficient is removed to reconstruct the signal and retain the useful signal components through applying the multi-decomposition of DWT transform to divide weak electrical signals of ginseng molecule into wavelet coefficients of different scales. The experimental results show that the multi-resolution analysis of DWT transform is performed for the weak electrical signal of ginseng molecule with different rhythms and different frequency ranges, and the weak electrical signal size of ginseng molecule before and after compression, the percentage of high frequency coefficients set to zero, and the average energy percentage after compression are, respectively, increased to 77.73%, 46.88%, and 99.99%. This algorithm operates fast enough to ease hardware implementation, providing an effective method for lossless compression of the weak electrical signals of ginseng molecule.
Research of Single Phase Short Fault in One-Generator Infinite Bus Power Systems
Authors: Tan Xiao Long , Zhou Jia , Wang Wen Bin
Published: July 2014

Electric power industry is related to people's livelihood, economic development, an important foundation for national construction industry. With the deepening of our country comprehensive construction, the demand has increased rapidly, at the same time also have higher requirements for quality of power supply. From the previous electricity use can be gradually increased to cannot accept a power outage, to the power grid voltage waveform, harmonic, frequency and so on each index has a clear requirement, countries have introduced related national standard specification. This aspect shows a gradually increase in the standardization of industrialization in China, on the other hand also puts forward higher demands on distribution power supply departments. One of the goals of the grid is to reduce the failure rate, improve the reliability of power supply. And power grid failure and is the highest percentage of short circuit fault, and the single-phase earth fault and occupy the vast majority of proportion, it is necessary to in-depth analysis of the formation mechanism of single-phase earth fault and damage, so as to find the related protection and remedial measures.
Study on Simulation Model on Partial Discharge in Void of Solid Insulation
Authors: Ming Li , Zeng Qing Hui
Published: July 2014

In order to analyze the partial discharge of void defect discharge in solid insulator, for the PD problems that at home and abroad simulation model can’t objectively reflect the physical process of partial discharge. Based on classical three capacitor equivalent-circuit model, the change of the electric field intensity and the voltage as size of the air void differs is studied. The influence of the air void geometry properties of partial discharge is analyzed. By comparing the results of the simulation model and its results and existing research results, the correctness of the circuit simulation model is verified.
Measurement and Research on Attenuation Characteristics of Low Voltage Power Line Communication Channel
Authors: Wang Yi , Wang Qian Dong , Hou Xing Zhe , Sun Hong Liang , Chen Xiao Ming , Li Xiao Jun
Published: July 2014

Signal transmission attenuation characteristics of low voltage power distribution network is an important factor must be considered by the power line communication system design. The effects of power line network on the power line communication channel attenuation are studied, including cable cross-sectional area, length and T network structure. With the experimental and simulation results, the relationship between low voltage power line cable length, the network structure and the power line communication channel attenuation is analyzed.
BIPV with On-Grid Tariff Policy in China
Authors: Guo Rong
Published: July 2014

Building integrated photovoltaic (BIPV) is an important direction of the green building. BIPV has developed rapidly in many developed countries and effectively saved resources. It owes to the government's effective promotion policy. The implementation of the on-grid tariff policy is a new stage of BIPV development. BIPV on-grid tariff pricing is a key point of BIPV promotion. Whether on-grid tariff is reasonable and applicable or not will directly affect the implementation effect of BIPV on-grid tariff policy. The current international common standard cost method is used to calculate on-grid tariff. Many countries implement unified on-grid tariff standard in their country, and often ignores the differences between different projects and areas. Based on the average on-grid tariff with standard cost method ,combined with the influence factors of BIPV on-grid tariff this paper build a corresponding on-grid tariff adjustment coefficient system with the current study method. Three methods used to get this goal are given and analyzed in this paper, the Delphi method, fuzzy mathematics method and neural network. This paper uses the Delphi method to build the on-grid tariff adjustment coefficient system model and choose three main factors, annual effective utilization hours, combination mode and PV system capacity, to build the on-gird tariff coefficient adjustment system model. This paper provides a reference basis of BIPV promotion policies and on-grid tariff pricing model for many countries.
Design and Develop Resources Investigation and Evaluation System of Electric Power DSM
Authors: Cheng Le Feng , Zhou Bin , Yu Tao
Published: July 2014

More and more deep integrated resource planning methods and demand side management (DSM) technologies have been studied and applied in China. Using technological and economic means of DSM, exploiting energy-saving potentialities from demand side, balancing load, easing contradictions of power structure, improving energy utilization rate, etc. have been important tasks in electric power enterprises. Based on this background, the paper designed and developed resources investigation and evaluation system of electric power DSM, which could investigate electricity resources of DSM of China, and implement energy-saving potential evaluation and energy efficiency analysis. From aspects of technology, economy, management, etc. suggestions were proposed for DSM, trying to be more rational and effective to allocate and use electricity resources, seeking satisfaction of power demands to the greatest degree, thus promote sustainable development of electric power enterprises effectively.
Evaluation of China's Energy Strategy
Authors: Wang Shuai
Published: July 2014

The energy problem is a matter of human survival and development of a global issue. With the deepening of the new industrialization, energy resources, climate change, environmental problems to human challenge is becoming more and more serious. In the development of China's energy consumption, energy consumption structure and the world in general there are many differences between the consumption structure, rational utilization of domestic coal resources, improve efficiency, promote the reform of energy-using way, will become China's energy industry development in the future be solved the problem. To build China's energy security system is not only the need of China's economic and social development, but also to enhance our voice and influence in the global energy affairs.
Modeling and Simulation of Grid-Connected Photovoltaic System Based on PSCAD
Authors: Han Xian Sui , Liu Qi Hui
Published: July 2014

In order to investigate the impacts of large scale PV power plants on the stability of power system, dynamic PV models are of particular interest to the industry for simulating large-scale power systems. The transient model of large scale grid-connected PV generation system was given based on the model of each component of PV generation system. Response of the model was simulated respectively when the illumination changes. The methods proposed could be applied to the power grid with photovoltaic generation integration.
Power Distribution System Evaluation in Chemical Industry Park Using Subjective and Objective Comprehensive Weight Method
Authors: Duan Zai Peng , Qian Xin Ming , Wang Ru Jun , Duo Ying Quan
Published: July 2014

The plan for power supply and distribution system in the Chemical Industry Park is complex. The evaluation method must be easy and truly show the site conditions in order to maintain the proper function of the system. Thus the fuzzy comprehensive evaluation method was chosen and applied in this paper. As for the weight calculation, Analytic hierarchy process (AHP) was used to compute the subjective weight; on the purpose of avoiding strong effect of subjective factors, the standard deviation for each index was calculated, and then the subjective weight was integrated to build the subjective and objective comprehensive weight model. Lastly fuzzy comprehensive evaluation method was applied into the model for assessing the power supply and distribution system in the Chemical Industry Park.
Effect of Different Radios of Two Complexes on the Structural and Optical Properties of ZnS Thin Films
Authors: Shang Jin , Ke Huan , Duo Shu Wang , Liu Ting Zhi , Zhang Hao
Published: July 2014

ZnS thin films were deposited at three different radios of V(NH3·H2O)/V(N2H4) on glass substrates by chemical bath deposition (CBD) method without stirring the deposition bath during the deposition process. The structural and optical properties were analyzed by X-ray diffraction (XRD) and UV-VIS spectrophotometer. The results showed that ZnS thin film deposited at the radio of V(NH3·H2O)/V(N2H4)=15:15 is higher than that of the other two different solutions. With the radio of V(NH3·H2O)/V(N2H4) decreasing from 15:5 to 15:15, homogenous precipitation of Zn (OH)2easily forms in the bath, but ZnS precipitation first become suppressed and then easily forms in solution. It means that the concentration of OH-ion increases with the volume of N2H4increasing, which accelerates the formation of Zn (OH)2. However, when the volume of N2H4increases to 15mL, relatively high concentration of OH-ion not only accelerates the formation of Zn (OH)2, but also be used to the hydrolysis of thiourea. The average transmissions of all the ZnS films from three different solutions (V(NH3·H2O)/V(N2H4)=15:5, 15:10 and 15:15) are greater than 90% for wavelength values in visible region. The direct band gaps range from 3.80 to 4.0eV. The ZnS film deposited for 2.5h with the radio of V(NH3·H2O)/V(N2H4)=15:15 has the cubic structure only after single deposition.
Research on Economic Security Evaluation of China's Coal Cities Based on Neural Network
Authors: Liu Hai Sheng , Chen Cang
Published: July 2014

According to the pressure-state-response model, building an evaluation index system, evaluating the level of economic security of 21 coal cities by back propagation (BP) neural network theory and means of MATLAB. The results show that the level of economic security of coal cities in China is not ideal and must be improved. The level of economic security shows regional differences.
Safeguard Mechanism Research for Effective Implementation of Energy Tax Policy Reform
Authors: Wang Ming You , Song Yang , Ji Liu He
Published: July 2014

Energy tax policy has an irreplaceable role in promoting conventional energy conservation, sustainable use and promotion of new energy sources. But China's current energy taxes still has many problems and needs an energy tax reforms. The effective implementation of the energy tax policy reform must have relevant supporting mechanisms to ensure implementation of the policy. Thus we need analyze the behavioral characteristics and trade-offs involved in policy-related aspects to achieve the establishment of appropriate safeguards.
Summary of Study on Error Evaluation Indices of Power System Simulation Model
Authors: Qin Zhao Lei , Ye Xiao Hui , Wu Li Na , Liu Guan Qi , Song Xin Li , Jiang Su Na , Liu Tao
Published: July 2014

The integrity, objectivity and science of the evaluation index system will be directly related to the accuracy of the evaluation results. However, studies on the quantitative assessment of the effectiveness of the simulation model are not still perfect, comprehensive, and links between relevant literatures are not close enough. The main thing is the lack of systematic summary of the theoretical literatures. Therefore, this paper is summarized in three aspects, the research results, indices classification and their respective advantages and disadvantages, the applicable range of indicators.
The Influence of Detailed Onshore and Offshore Wind Farm Models on the System Voltage Level
Authors: Gao Jian Tao , Zhu Xiao Rong
Published: July 2014

For the power load centers in china coast, large-scale development of new energy (such as offshore wind power and onshore wind power) is not only an effective means of control the bad weather (such as fog and haze), but also the practical requirements of coastal power shortage. In this paper, according to actual situation of China's large-scale wind power accessing to the coastal load centers centrally, also the characteristics of onshore and offshore wind farm models is considered, The voltage variation in the centralized model and detailed model is analyzed based on the platform of PSD-BPA, and the characteristic of each model is obtained. Research results have a certain reference value for China's coastal onshore and offshore wind power development.
Modeling and Uncertainty Estimation of Wind Power Curve Based on Recorded Field Data
Authors: Lin Peng , Zhao Shu Qiang
Published: July 2014

Wind power curve of wind turbine has great importance in the prediction of wind power. The measured wind power curve is drawn by method of bins based on recorded field data; the uncertainty factors of the wind power curve is analyzed, and a non-parametric confidence interval estimation method is proposed based on analyzing the statistical characteristics of the data distribution. By means of the method, a probability density function model for wind power in each wind speed level is established, and the uncertainty estimation confidence interval of wind power curve is obtained on the basis of deterministic estimation. The example analysis proves the efficiency and feasibility of the method proposed in this paper.
Duplicate Confluence Precipitation Technology Processing Desulphurization Dust Removal Actual Waste Water Experimental Study
Authors: Gao Yun Xia , Dai Xue Min , Yao Li , Nan Guo Ying
Published: July 2014

In order to discuss the treatment performance of wastewater from desulphurization precipitator by settling technique of compound flow, the field test rendered the effluents of integrated desulfurization precipitator as the handing objects. The results show that the critical load of the sediment separator is 4mm/s. When the surface load is less than or equal to 4 mm / s, the turbidity of effluent is less then 10 degrees and the maximum is less then 18.2 degrees. The effect of hydraulic load impact on the water treatment system is greater than that of pH and SS of inlet. The treatment efficiency of field test is equivalent that of laboratory simulation.
Review on the Supervision Monitoring Program for Radiation Environment around Nuclear Power Plants
Authors: Zhang Yan Xia , Li Jin , Lu Wei Wei , He Liang
Published: July 2014

The supervision monitoring program of radiation environment around nuclear power plants is an important basis for the environmental radiation monitoring work. Key elements such as source, exposure pathway and representative person are discussed in the design of the supervision monitoring program, and technical details about the review of monitoring, evaluating and quality assurance are also given in this article. For the supervision monitoring work of radiation environment around nuclear power plants, it can provide some guidance about the review of the supervision monitoring program for nuclear safety regulators, and provide some reference about the design and revision of the supervision monitoring program for nuclear safety monitoring departments.
Modeling and Optimization of Heat Exchanger in Automotive Exhaust Thermoelectric Generator Based on Fluid Kinematics
Authors: Wang Xin Yu , Wang Shun Min , Zhou Liang , Li Xi Chao
Published: July 2014

The HE (heat exchanger) of automotive exhaust TEG (thermoelectric generator) plays a vital role in converting thermal energy into electrical energy, therefore achieves the goal of energy conservation and emission reduction. A new regular-octagon HE is modeled and simulated in FLUENT to obtain the velocity path-lines of fluid. Through simulation results, the velocity path-line is tracked and analyzed, in order to evaluate the fluid resistance and fluid turbulence intensity. By using control variable method, a variety of HE models with different structural parameters are modeled and simulated, to optimize the structure of HE. Eventually, it is intended to design a HE with proper fluid resistance and remarkable turbulence intensity.
Physical Parameters Consistency Based 3D Temperature Field Reconstruction for Combustion Flame
Authors: Wang Xu Guang , Zhang Hai Peng
Published: July 2014

We present a novel solution to accurately recover 3D dynamic flame temperature field based on physical parameters consistency. First, a new optical model is proposed to establish the relationship between the flame radiation and the radiance field, this model fully considers refractive effect caused by refraction index changing; Second, high dynamic range (HDR) cameras are used to take flame images, a lookup table is employed calculate temperature from radiance; Third, an algorithm is put forward to reconstruct the flame temperature field. Experimental results on real flame accord with physical facts, which demonstrate that our solution is validate.
Review of Research Development on Slurry Pipeline Drag Reduction Technology
Authors: Sun Ping , Wang Dong Dong , Sha Yu Zhang , Liu Lu Xi
Published: July 2014

Theresistance of slurry pipelinetransportation has greatly impact on slurry transportation system. In order toimprove transportation efficiency,energy utilization rate,taking theappropriate drag reduction technology has a very important significance.Thispaper presents drag reduction technologies for slurry transportationapplications,including micro-bubble drag reduction technology and vibrationdrag reduction technology.
Verifying Calculation of Reactor Pressure Vessel Fast Neutron Fluence
Authors: Liu Qiao Feng , Han Jing Ru , Chen Hai Ying , Zhang Chun Ming
Published: July 2014

The reactor pressure vessel is an unchangeable component of the light water reactor. To some extent, the life of the pressure vessel depends on the fast neutron fluence. In addition, the fast neutron fluence is an important parameter for radiation protection. So, the fast neutron fluence is one of the main parameters which should be verifying calculated by the reviewers. The verifying calculation of the fast neutron fluence of one reactor pressure vessel is presented in this paper, and the standard deviation between the verifying and designing calculations is lower than 10%. The reasons for the deviation are discussed.
The Performance Research of Different Concentrations of Methyl Adsorption on Si (110) Surface
Authors: Yan Zheng Xin , Yan Dong Zhi , Chen Qian , Gong An , Liao Qian
Published: July 2014

First-principles method was carried out to investigate the methyl chemical adsorbing on Si (110) surface. To clarify the different concentrations of methyl on Si (110) surface, the mono-methyl, double-methyl, treble-methyl, and quadruple-methyl on the Si surface adsorption models were comparably investigated. Adsorption energy and methyl C-H bond structure change, density of states and electron density difference were used to analyze the structure change of adsorption models. The adsorption energy shows that Si surface top site has significant sensitivity to methyl, and the adsorption energy increase with the increasing methyl concentrations. The electron density difference data show charge transfer is obvious and electron cloud center tend to Si atom with Si-C bond formed. The PDOS of methyl reveals electron peaks move to the low direction about (5.5036, 5.7868, 5.8572, 5.8788eV) with the increasing concentrations of methyl. The data above exhibit that quadruple-methyl adsorption structure is more stable one. The conclusion can provide the insight for gas detection and sensors.
The Effect of Doping Lanthanum on Phlogopite-Iron Pearlescent Pigments
Authors: Fu Yu , Pang Xue , Liu Mei Tang
Published: July 2014

Mica-based pearlescent pigments are widely applied in plastics, cosmetics, automobiles coatings and other fields, but very few applications in high temperature field are found as their poor heat resistance. In this paper, phlogopite is chosen as a new substrate which is coated by Fe2O3(doping with La3+) in order to improve the high temperature resistance and luster of the new developed pearlescent pigments. According to the X-ray diffraction (XRD) and scanning electron microscopy (SEM) results, it is found that Fe2O3nanospheres were coated on the surface of phlogopite homogenously. Colorimeter data imply that doping La3+can improve the color saturation and purity of pigments apparently. And the optimum amount is 3% lanthanum nitrate addition in this work.
Experimental Study of Dynamic Characteristics and Model Parameter Identification of Tensioner
Authors: Wang Hong Yun , Zeng Xiang Kun , Zhao Ji Yong
Published: July 2014

Tensioners play a predominant role in the dynamic behavior of serpentine belt drive systems. The experimental set-up was carried out to study the dynamic characteristics of tensioner. Experimental results illustrate that tensioner shows hysteresis nonlinear dynamic characteristics, and dynamic stiffness and damping of slip motion of up stroke of tensioner are related to excitation frequency and amplitude. The first differential nonlinear model of tensioner was determined, and the parameter identification method of the model was introduced. The accurate of the nonlinear model and effectiveness of the parameter identification method was validated.
Nonparametric Control Charts Design and Analysis for Small Lot Production Based on the Moving Average
Authors: Deng Yu Hao , Zhu Hai Ping , Zhang Guo Jun , Yin Hui , Liu Fan Mao
Published: July 2014

This paper designed a moving average sampling method for small samples, further designed moving average (MA) control chart and moving average cumulative sum (MACS) control chart respectively, and calculated the in-control and out-of-control average run length for both charts. The charts are robust, which can monitor the process state effectively without knowing the distribution. Through analyzing the control chart costs and quality loss that is related to the production lot size, the control chart parameters are reasonably optimized. By comparing the average run lengths and some numerical examples, the paper finds that MACS chart has a good performance on detecting small shift within the small samples under the nonparametric condition.
The Application of Finite Element Method in Calculating Two-Dimensional Heat Conduction in the Ground
Authors: Zhang Hui , Zhang Jing
Published: July 2014

This thesis simulated the principle of the fast heat conductivity testing instrument, introduced how to use the finite element method to calculate two-dimensional unstable heat conduction condition. When establish the mathematical model, the article simplifies the soil temperature field as the two-dimensional non-stable heat conduction problem. Through computation it can get the soil temperature field at any moment in the running time and the plan uniform temperature lines, that also may obtain the change of temperature about one point in the process. The method is simple and credible. These solutions of these questions are the foundation of research the heat conduction in the ground and the temperature field.