bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation on Fault Detection Optimization Model of Large Intelligent Electronic Inverter
Authors: Huang Chun Ping
Published: July 2014

When a fault of power system occurs in grid-connected point, a serious impact is added to electronic inverter in photovoltaic micro-network internal including current, voltage and phase, the appropriate control strategies for completing fault detection of large-scale intelligent electronic inverter, is one of the currently hotspot difficulties. An engine fault diagnosis method based on PSO-SVM is proposed. Particle swarm method is used to search engine fault signals in designated space, so as to obtain optimal particle and provide the basis for an engine fault diagnosis. Support vector machine (SVM) method is applied to classify engine failure signal to complete the engine fault diagnosis. Experimental results show that the proposed algorithm for the engine fault diagnosis, can greatly improve the accuracy of diagnosis, so as to meet the needs of actual production, life, and achieve satisfactory results.
The Irremovable Properties Proof of Decaying DC Component for Dynamic Phasor Measurement
Authors: Bao Hai , Han Jin Si , Zhang Shu De , Chen Yu Long
Published: July 2014

Dynamic voltage can be described by two parts in time domain, sinusoidal steady state component and dynamic state component. The latter reflects the effect of the system’s characteristic root, and is also called decaying DC component. Decaying exponential signal has continuous spectrum, and this characteristic has a bad effect on the accuracy of phase angle’s measurement, therefore the idea of filtering the decaying exponential signal was proposed. To verify the possibility of this proposal, this paper analyzes the frequency formation of dynamic voltage signal mathematically, and points out that at the frequency of the sinusoidal component, measured voltage signal’s time domain description is the superposition of two sinusoidal signals with the same frequency, different phase angles and different amplitudes. This is the reason for the deviation between the measured voltage angle and the theoretical phase angle. The deviation angle not only shows the combined action of steady component and dynamic component, but also illustrates that the decaying exponential signal cannot be filtered out.
Videogrammetric Techniques for Wind Tunnel Testing and Applications
Authors: Zhang Zheng Yu , Huang Xu Hui , Yin Jiang , Lai Han Xuan
Published: July 2014

Videogrammetric measurement is a research focus for the organizations of wind tunnel test because of its no special requirements on the test model, its key techniques for the vibration environment of the high speed wind tunnel are introduced by this paper, such as the solution of exterior parameters with big-angle large overlap, the algorithm of image processing for extracting marked point, the method of camera calibration and wave-front distortion field measurement. The great requirements and application prospects of videogrammetry in wind tunnel fine testing have been demonstrated by several practice experiments, including to measure test model’s angle of attack, dynamic deformations and wave-front distortion field in high speed wind tunnels whose test section size is 2 meters.
Analysis of Active Power Loss for Reactive Power Compensation Devices
Authors: Cheng Ying Ying , Zhou Feng , Xiao Ji
Published: July 2014

Analyzing the active power loss of reactive power compensation device under normal reactive power output status and its influence factors and metering the active power loss of the reactor in the 500kV substation and the capacitor in the 220kV substation, concluding that the active power meter had the influencing factors of forward and reverse active and putting forward the assessment requirements for the running reactive power compensation device by analyzing the site calibration data of metering device.
Remote Sensing Interpretation and early Warning System Designing of Geohazards along Transmission Lines - A Case Study of the Danba - Kangding 500 kV Double Circuit Transmission Line
Authors: Cao Yong Xing , Chang Ming , Tang Chuan , Li Wei Le , Ma Guo Chao
Published: July 2014

The landslide and debris flow investigation area for Danba ~ Kangding 500 kv double-circuit transmission line route selection is within Ganzi in Tibetan autonomous prefecture, with the area of about 440 km2. The topography, geomorphology, geologic structure, stratum lithology, natural factors, social and economic conditions have great influences on the transmission lines route selection and its construction. For comprehensive evaluation engineering rationality and construction convenience, remote sensing technology (RS) and geographic information system (GIS) technology are taken to implement geological environment survey. With field investigation, remote sensing images interpretation method is used to determine basic characteristics of the geo-hazards.
Research of Improved On-Line Power Flow Method
Authors: Bao Hai , Wang Ling , Chen Yu Long
Published: July 2014

Based on measurement accuracy of reactive power lower than the accuracy of active power and voltage magnitude, this paper proposes an improved on-line power flow method. Through simulation, compared with the conventional power flow, this method improves the accuracy of the calculation results and also has obvious advantages on the convergence rate. Finally, the article analyzes the reasons for this situation.
Study on a New Type of Electric Larceny Using Half-Wave Rectifying Method
Authors: Xiao Ji , Zhao Fu Ping , Cheng Ying Ying , Zhou Feng , Liu Rong Mei
Published: July 2014

A new electricity larceny case is proposed in this paper, which using half-wave rectifying method. According to the fact that users consumption varies greatly, analyzing the phenomena discovered and stealing principle. Then simulating the method of electricity larceny in the laboratory, and dissecting the error of the half-wave rectifier stealing mode under different current and power factor. Finally, proposing preventive measures and proposals targeted.
Study on Linearity of Impulse Voltage Divider
Authors: Long Zhao Zhi , Lu Fei , Li Wen Ting
Published: July 2014

The uncertainty contribution related to linearity shall be considered in the calculation of measurement uncertainty when using the impulse voltage measuring system. Under the condition that the national standard is not yet established at present, the paper proposed an experimental method to measure the linearity of 600kV damped capacitive impulse divider (HCR600). The paper used low voltage resistance divider R200S to measure the linearity of generator, and obtained the linearity curve. With the increase of charging voltage, the linearity of divider can be obtained by measuring the charging voltage of impulse voltage generator precisely and its ratio of indicating value of the sample divider HCR600 after corrected. The result shows that the linearity of HCR600 decreases from +0.4% to-0.8%; the maximum difference between positive polarity and negative polarity is 0.14% and the linearity of negative polarity is superior to that of positive polarity. Besides, the paper used a 500kV resistance divider (SMR 7.7/ref500) calibrated by PTB to compare with HCR600, and obtained the linearity curve. By comparison, two curves show a good agreement, the maximum difference between them is 0.15% at the same voltage. The result shows that the method proposed in the paper can be used to measure the linearity of divider accurately. It also can be used as experimental verification in the process of the national standard establishing and to calibrate the ultrahigh voltage impulse voltage measuring equipments when equipments satisfy some requirements.
Development of Calibration Device for the Belt Weigher Based on the Material Superimposed Technology
Authors: Cheng Jia , Liu Yi Zhou , Chen Yuan Jie , Huang Zhen Wei
Published: July 2014

Great accuracy is required in the settlement process of coal trade. In order to improve the accuracy of coal measurement, a set of online belt weigher calibration device based on the method of material superimposed has been developed. The mechanical structure of the whole device is well designed realizing material circulation conveying. At the same time the software and hardware of calibration system are fully designed.Finally the experimental results indicate that the uncertainty of the calibration device for belt weigher is within 2% and the minimum theoretical ratio of belt material superimposed is about 42% which attains the error requirement of grade 0.5.
A Design of Intelligent Fast Charger Based on 89C52 MCU
Authors: Chen Lun Qiong , Du Lu Lu , Li Bei
Published: July 2014

In order to reduce the charging time and improve the charging efficiency, designed a kind of intelligent charger on the base of existing charging methods by stages after analyzing the advantages and disadvantages of the domestic quick charge of the storage battery. This system uses STC89C52 as the controller, adding the function of trickle charge and the ability to prevent reverse polarity. It has extended the working life of storage battery a lot.
A Sense Amplifier for Low Voltage Embedded Flash Memories
Authors: Zhang Hua
Published: July 2014

A sense amplifier applied for low voltage embedded flash memories is presented. The sense amplifier uses an enhanced current sensing method allowing power supplies lower than 1.5 V to be used. The sense amplifier was implemented in a FLASH realized with a 0.13 um FLASH technology. Simulation results showed a read access time of about 25 ns with a power supply of 1.5 V, and 32ns with a power supply of 1.2V.
A Voltage Compensation Circuit for Flash Memory
Authors: Zhang Hua
Published: July 2014

In order to get a stable source line voltage, a novel source line voltage compensation circuit has been designed to compensate the IR drop on the source line decoding path. The circuit is verified in 0.18um flash memory technology.
A Costal Wave Energy Power Station Equipment
Authors: Tong Jun Jie
Published: July 2014

This paper introduced a coastal wave energy power generation and its unique dual channel structure, in which two–way coastal current was transformed into single direction rotation of the impeller. Also according to coastal wave energy characteristics, the paper analyzed relationship between inshore sea water kinetic energy and the wave amplitude away from the coast. In addition, the water velocity and flow area of equipment through power generation equipment are studied.
Calculation of Thermal Performance in Amorphous Core Dry-Type Transformers
Authors: Li Yan , Guan Yin Jun , Li Yang , Li Tian Yuan
Published: July 2014

The amorphous core dry-type transformer is a new energy-saving transformer. In this paper, a SCBH15-600/10 type amorphous core dry-type transformer is analyzed by 3-D finite element calculation of iron core and winding thermal. Analyzing the temperature distribution characteristics of amorphous transformer, assure the temperature rise highest point. It is in the permitted error between the simulation value and test value. It has important engineering value for the calculation of similar transformer temperature rise; and has certain guiding significance on the amorphous transformer structure design.
Design of Intelligent Reactive Compensation Controller Based on Microchip
Authors: Wang Hai Xiang
Published: July 2014

The reactive compensation controller using MC9S08AW60 chip and ATT7022A is introduced. The detail design of the hardware and software is illustrated too.
Design of Micro Power Consumption Synchronous Chopped Wave Power Supply Based on Fixed and Mobile Double Comparative Point
Authors: Wang Long Teng , Lin Jun , Su Hui
Published: July 2014

This paper proposes a design method of the micro power consumption synchronous chopped wave and low-power switching power supply based on fixed and mobile double comparative point. The output of this power supply ranges from 5V to 200V. It overcomes the residual voltage effect after the bridge rectifier by using fixed comparative point to limit the maximum output voltage, and stabilizes the voltage by using mobile point to produce the required output voltage. The circuit charges with nonlinear resistors pattern in the low voltage, thus improving the charging efficiency, and it has short circuit protection function, simple structure and low power consumption.
Design of Three-Phase Reference Energy Meter Based on FPGA and ARM
Authors: Wang Xian Wei , Qian Zheng , Tian Shuang Shu , Qiu Yong Jie
Published: July 2014

Compared with the normal energy meters which use the integrated measurement chip as the key component, the three-phase reference energy meter based on FPGA and ARM possesses the advantages of high precision. And compared with the energy meters which use DSP as the key part, it has the advantages of small volume and multi-parameter measurement. The design method of three-phase reference energy meter integrating FPGA with ARM is presented in this paper. And the individual miniaturization design are discussed, the key parts during the realization are also discussed. After that, two kinds of electric energy metrological algorithm which are digital differential and instantaneous IV are introduced according to the characteristic of the system, and the advantages and disadvantages of them are compared. All this work will provide powerful foundation for the engineering applications of design method.
Development and Design of Embedded Control Systems for Coal Mine
Authors: Li Xiao Fang
Published: July 2014

China's coal mine monitoring system and scientific management level is relatively backward. Environmental information of coal mine is difficult to achieve control and sharing. Combining with the traditional model of the safe production of coal, the author presents a new monitoring system structure of coal mine based on embedded technology to achieve the aboveground control and underground monitoring of coal mine. By combining control instance of monitoring system, this paper focuses on the safety production monitoring system design and implementation of coal mine, and describes the design methods for monitoring system, which is helpful for China's coal production safety.
Implementation of Single Phase Locked Loop Based on FPGA and its Application in SVC
Authors: Pei Yu Jie , Zhang Yun Shan , Xu Jian Guo , Mu Jing Long , Zhang Lei , Dong Pin , Cong Bo , Wang Shu Han
Published: July 2014

Whereas three-phase phase locked loop could not get accurate phase position under three-phase unbalanced condition of the power grid, the design of single phase locked loop is implemented in the principle of single phase locked loop, based on FPGA technology. the paper explains design difficulties of single phase locked loop in detail, puts forward adaptive sampling scheme using single phase locked loop under variable frequency, increases accuracy of SVC sampling system. And tests response speed of phase locked loop via Real Time Digital Simulator for Power Systems (RTDS), through final verification in Fushun Lishizhai SVC Project, the design could meet system requirement for voltage phase accuracy.
A Heuristic Analysis Method for the Impact of DGs to Power System Reliability
Authors: Zeng Bo , Wang Kai , Kong Xiang Yu , Zeng Yi , Yang Qun
Published: July 2014

With high penetration of distributed generation connected to the grid, distribution system will have some huge impacts, and system reliability calculation models and assessment methods are changing. Based on Monte-Carlo method, a heuristic reliability analysis method for distribution system with distributed generations was proposed in the paper, which focuses on the mode of distributed generation in parallel to system power supply. Functional role of distributed generation in the power distribution system failure and distributed power adapter with load strategies were analyzed in this method. Cases simulation analysis was used to verify its effectiveness.
The Research on Deposition Saturation of Disc Suspension Porcelain Insulator
Authors: Hai Tian Shu , Wang Qing Hao , Ge Chang Xin , Wu Shao Yong , Cheng Peng Fei , Cheng Shuo , Hu Yang , Li Zhi Xuan , Huang Dong Wei , Shi Feng
Published: July 2014

The equivalent salt deposit density (ESDD) is an important characteristic of our country which is used to measure insulator deposition level. The contamination of the insulator would reach saturation after a period of time.In order to increase the specific creepage distance, disc suspension porcelain insulator lower surface inward concave, which makes the rain washing the upper surface difficult, that cause the saturation time of lower surface longer than upper surface .For studying the operation insulator contamination saturation time and reflecting the ESDD of the actual operation line accurately,this paper adopts a comparison method between empty hanging insulator surface and operation insulator surface to measure the ESDD , the field experimental results further verify that the saturated time of disc suspension insulator lower surface is longer, so as to lay the foundation for the ESDD measurement.
A Novel Comprehensive Draw-Out Power Circuit of High Voltage Thyristor
Authors: Tian Yu , Yin Zhong Dong
Published: July 2014

The method of self-energy extracting has been adopted in high voltage thyristor device more and more widely. In consequence of the existing insufficient of high heat loss and large variation range of storage voltage value, this paper designs a novel comprehensive draw-out power circuit which is suitable for almost all kinds of working conditions of thyristor. The circuit includes voltage draw-out power module, current draw-out power module and the coordination control module between them. The principle of each module has been detailed analyzed and the calculation formulas of the corresponding parameters have been concisely given. At last, every conclusion drawn in this paper has been verified in simulation.
Multi-Level Cascaded H-Bridge Inverter Based on Three Harmonic Injection Method
Authors: Ye Man Yuan , Li Song
Published: July 2014

This paper introduces seven-level Cascaded H-bridge (CHB) inverter and work principle. Then, the strongpoint and disadvantage of multi-level inverter usual PWM technologies are analyzed and compared. We find that multi-level cascaded inverter based on three harmonic injection method have two advantages via analysis. The voltage modulation index can increase 1.15. The equivalent switching frequency of H-bridge inverter’s load voltage is N times of each cell switching frequency. At last, H-bridge inverter was investigated with simulation and experiment. The results prove that the analysis is correctness and validity.
Research on an AC/DC Converter Based on the Convert Station in HVDC Light Technology
Authors: Huang Yue Hua , Zhou Zhe Heng , Fan Hong Tao , Qi Jian
Published: July 2014

In this research, a converter, suitable for the convert station of the HVDC light technology, is proposed and optimized. The converter mainly consists of AC chopper, rectifier transformer, low-pass filters and smoothing reactor. This system can restrain the disturbance of the input power and output the power with high quality. This research is going to analyze the working principle of the converter and then optimize the output wave through filters. Circuit’s simulation is carried out by MATLAB to verify the reliability and feasibility of this converter topology.
Research on Photovoltaic DC Power Supply System for Office
Authors: Wang Hui , Wu Jiang , Gao Hou Lei , Yuan Jian Hua
Published: July 2014

This paper discusses the post stage power supply circuit’s structure of electronic appliances such as laptops, desktops, mobile phones and digital cameras, which are commonly used in office. The advantages and feasibilities of DC power supply’s substitution for AC are analyzed. On this basis, a DC power supply system consists of photovoltaic cells, batteries, AC/DC modules, DC/AC modules as well as DC loads is brought forward. The main power supply unit, photovoltaic cells, connects the DC bus through a DC regulator circuit. The bus voltage can be maintained stable by real-time adjustment of photovoltaic cells’ output power. The battery module connects the DC bus through a bidirectional Boost-Buck circuit. The charges and discharges of batteries can be real-time controlled according to the bus voltage level. The AC/DC module connects the DC bus as a backup, which can real-time detect the bus voltage to determine whether to start. The DC/AC module can supply power to ordinary AC loads and the DC loads are usually powered from the bus through DC/DC converters.
Simulation of EMP Inject Effects Based on Improved Elman Network
Authors: Ji Zhi Qiang , Wei Ming , Wu Qi Meng , Wu Xiao Le
Published: July 2014

In order to quickly determine the performance of a transient voltage suppressor (TVS), improve time domain identification capability of Elman network, the simulation of electromagnetic pulse (EMP) inject effects based on improved Elman network is proposed. Derivation proved that improved Elman network trained by standard BP algorithm has a similar form with the basic Elman network trained dynamic BP algorithm. We establish and improve its Elman network predictive modeling based on the measured parameters of TVS and then demonstrate that improved Elman network has the characteristics of quick speed, high precision, good performance and strong generalization ability, and broad use of prospects.
The Model for PV Array Based PSIM
Authors: Zeng Ji
Published: July 2014

Based on the theory and mathematical treatment for the photovoltaic cell, a simple and accurate PV array model of external characteristics is developed with PSIM. Output simulation results for different Temperature and Light intensity. The simulation results show that I-V and power simulation result of the Photovoltaic array model, and experimental result are in close agreement with each other. This verifies the accuracy and suitability of the developed PSIM model.
Analysis of Statistical Characteristics of the Laser Vibrometer’s Static Signal Noise
Authors: Yang Jing , Tang Jian Long , Hou Jun Hui , Zhang Xue , Wu Zhi Shan
Published: July 2014

The static signal is collected through the experiment, and the probability density function model is established. The static random signal noise is analyzed by frequency spectrum, power spectrum and high order spectrum analysis. It is found that the third order spectrum of the laser static signal is zero by the high order spectrum analysis. Noise signal is only to analyze on the frequency spectrum and power spectrum. The results show that the static laser signal has the characteristics of stationary Gauss random signal.
Analysis of the Channel Capacity under OFDM System with Insufficient CP
Authors: Liu Xin Ya , Yang Hong Wen
Published: July 2014

The standard OFDM signal requires a cyclic prefix (CP) of length larger than the channel impulse response. This paper investigates the effect of CP length to the capacity of OFDM system. We have found that full CP or none CP may not be optimal in the sense of capacity. Specifically, the capacity is a monotonic function of CP length in the low and high SNR regime and is approximately concave down when SNR is about 3dB.
Coupling Effect of Transmission Lines by HEMP Based on CST
Authors: Zhang Jian Guo , Zhang Xin
Published: July 2014

High-altitude nuclear electromagnetic pulse (HEMP) has a significant effect on electronic devices by cables. This paper makes an analysis of field-wire coupling. With the software of Computer Simulation Technology (CST) constructing the model, coupling current has been acquired. The effect of length, height and impedance on coupling current has been gained. To our surprise, the rise time of HEMP is faster than the time of coupling current. This provides HEMP hardening with the crucial basis.
SVG Graphical Analysis Tool Online Regional Reactive Power Optimization System Development
Authors: Li Gan , Ding Li Jie , Li Dan Dan
Published: July 2014

Online region reactive power optimization is used to reduce power bus voltage operation over limit and reduce net loss for the economy to ensure that the power grid of great significance. SVG graphics file is a standard file format used by our dispatching operation, analysis file and basic information within the file corresponds to reactive power optimization system can guarantee the system reactive power optimization of interactive graphics capability and versatility. In this paper, we design and development of a SVG graphics file parsing tool that can automatically complete the import SVG, structural analysis, and text parsing; graphics and connectivity analysis to ensure the accuracy of the topology; the module contains a custom chart for human-computer interaction element, Element Properties and topological analysis and dynamic trend function, to meet human-computer interaction and reactive power optimization computing needs. This module has been applied to a region with reactive power optimization system, with good results.
A New Clustering Routing Algorithm of Wireless Sensor Network
Authors: Chen Li Qiang
Published: July 2014

In wireless sensor network, node’s energy is limited. The energy consumption of transmission a bit is larger than that of handle a bit. If it adopt effective routing algorithm, it can greatly improve the energy efficiency of wireless sensor network. In order to improve the energy efficiency of wireless sensor network in the large area, we propose a clustering routing algorithm based on energy, the algorithm realize the multi-hops communication between cluster heads by dividing the WSN area into concentric rings, and reduce the size of radius of the clusters gradually when the nodes’ energy is decreasing slowly. The results of simulation show that the algorithm can effectively prolong the network lifetime.
Research on Broadband Channel Characteristics and Hardware Testbed for Power Line Communication System
Authors: Wang Yi , Yang Yun Chun , Hou Xing Zhe , Sun Hong Liang , Zheng Ke , Ye Jun
Published: July 2014

With the decision to construct the smart grids around China, the power line communications (PLC) on the low-voltage (LV) distribution networks have become one of the potential technologies to commute the information between the end users and the power provider. Comprehensive and well-founded knowledge of the LV power line channel is the foundation to establish realistic modeling of the channel characteristics. The growing power line communication (PLC) technology is providing new potential for emerging applications such as G3 and Prime. In this paper, we have proposed a OFDM based channel sounding test bed to measure PLC channel within frequency band 100 kHz-2 MHz. A souding signal for the PLC channel is designed and a time-domain measurement method for the time-varying PLC propagation is presented. The experimental results of PLC channel characteristics under different scenarios are and analyzed.
Research on the Convergence Trend of Power Communication Network
Authors: Liu Wen Gui , Lin Yi Lei , Feng Bao , Zhong Chang Qing , Yi Dan
Published: July 2014

With the development of communication technology, the communication network present many characteristics, such as unified standard, flatten structure and diversified services. As a special form of communication network, power communication network has higher requirements on intelligent, stability, reliability and real-time. In order to better support smart grid, we analyzed the current communication network at first. On this basis, the converged power communication network is proposed from two aspects: communication technology and network architecture. Moreover, typical technology route and network architecture is also given in the convergence background. The conclusion is that the converged network can solve problems of the current independent network, and it is an inevitable evolution direction of the future.
AN Research on Energy Management and Cooperation Performance in Eco-Industrial Symbiosis Network
Authors: Zou Ya Ling , Li Chun Fa , Yao Zhan Dong , Cao Ying Ying
Published: July 2014

With the rapid development of economy and technology, enterprises in eco-industrial symbiosis network (EISN) are facing enormous challenges. However, the emergence and development of EISN is closely tied with the energy management in eco-industrial park (EIP). This paper takes institution construction, allocation and new technology of energy management, cooperation performance and long-term cooperation relationship into research and develops a theoretical model of energy management accordingly. We conduct statistical analysis and Structural Equation Modeling using SPSS17.0 and AMOS17.0 based on 241 valid questionnaires from the EISN enterprise managers. The findings indicate institution, allocation and new technology are significantly positively related to cooperation performance, and cooperation performance has positive significant influence on long-term cooperation relationship. Based on the above results, the relative strategies and suggestions of strengthening energy management to enhance cooperation performance are given.
Energy Saving Routing Protocol of Wireless Sensor Network by Using Particle Swarm Optimization Algorithm
Authors: Wang Run Liu , Yi Yun Hui
Published: July 2014

The utilization efficiency of energy is an important performance index of designing WSN routing protocol. This paper put forward an improved energy saving routing algorithm LPSOA based on LEACH, which improves the cluster head election method of LEACH algorithm. It firstly divides the entire network into multiple child regions by using the good convergence and global optimization ability of particle swarm algorithm, and then elects the cluster head by considering the residual energy of node in the child area. The experiment results show that compared with the classical routing protocol LEACH, the protocol can more effectively balance the network load and improve the utilization of energy, prolong the network lifetime.
Performance Evaluation and Analysis of ZigBee Technology in Smart Grid
Authors: Wei Ke Feng , Wang Duo
Published: July 2014

As heavy investment in the smart grid in China, the research and application of new technology has obtained rapid development. To meet the requirements of reliability, stability, robust and low energy consumption in smart grid, ZigBee plays an important role with its own inherent advantages and reasonable design. In this paper, we focus on the route algorithms of ZigBee, introduce the principles and evaluate the performances of them. The simulation results provide feasible effective evidence and feasible solution for further development for smart grid by using ZigBee technology.
Research and Application of Mobile Internet Technology in Power
Authors: Zhao Guang Zhong , He Shu Ping , Zhang Wei , WU Jian Nan
Published: July 2014

Based on mobile Internet technology applications, Customers access ladder price electricity price standard, the implementation, such as power charge information. Change the way traditional electricity propaganda, tips, rich ladder price electricity price means of propaganda, tips. Improve the enforcement ladder price electricity price propaganda, strengthen the publicity and guide ladder price electricity price, improve the various circles of society to the understanding and awareness of the residents ladder price electricity price policy. Tariff and other policies to promote in the future suggesting that provides technical application support for the implementation of the price ladder policy to create a good atmosphere.
Research on Visualized Protective Relaying Setting Software for Coal Mine Power System
Authors: Sun Kang , Sun Nian Nian
Published: July 2014

According to the special requirement of protective relaying setting in coal mine power system, the research and development of a visualized protective relaying setting software is described in this paper. Firstly, software architectural and its functional module is defined to meet special needs, then a novel setting method based on ‘triggered by setting condition’ and action simulation method based on setting value are proposed. Object-oriented and visualized programming means ensure its users can easily and directly carry out the setting calculation of protective relaying and simulate the protective action. The application and the achievements of good effects at last ensure its rationality.
Relationship of Three Rock Parameters
Authors: Sui Li Li , Yang Yong Ming , Liu Peng , Chen Jia Liang , Ge Zhi Shun , Chen Lei , Zhang Shou Cheng , Yu Jian
Published: July 2014

In order to solve complex problems of traditional methods used to evaluate the rock fracability, the relationship between fractal dimension, rock brittleness and fracture density these three parameters was studied. The multiple linear regression is reasonable through nine kinds cores. The regression coefficients demonstrate both rock brittleness and surface fracture density play positive roles on fractal dimension value, the larger they are, the better the fracability. Therefore, the two parameters can be converted to consider only one parameter that is the fractal dimension of rock. The larger the fractal dimension, the better the fracability is, that is using fractal dimension represents brittle index and surface density to participate in fracability evaluation.
Research on Guided Roadway Pressure Relief Combined Supporting Technology in High Stress Roadway
Authors: Li Wan Jiang
Published: July 2014

The problem of maintaining the surrounding rock in deep high-stress roadway has been a major subject in coal mining. The analysis of high stress roadway supporting mechanism, and the research on high stress roadway supporting technology as well as its adaptability have important significance in improving the support technology of mine. This paper analyzes the features and reasons of the high stress roadway deformation and failure, and the high stress roadway supporting measure is put forward. At the same time the paper systematically analyzed the guided roadway pressure relief combined support technology which has been used in the transporting roadway in Taoyang Coal Mine and achieved good.
Analysis of Industrial Structure Optimization Based on Energy Saving
Authors: Cao Ying Ying , Zou Ya Ling
Published: July 2014

The industrial structure optimization based on energy saving is different from the traditional industrial structure optimization. It relays on the supply and demand of industrial structure. It takes low carbon cycle, energy conservation and environmental protection as guiding principles and maximization of the use of resource and minimization of production from environmental pollution as the goals. Innovation of technology has also be taken as a means to help industry be sustainable, healthy and orderly and to shape an industrial optimization model that economy, society, nature are harmoniously existed. In this paper, we have an analysis of the energy industry structure to point out the shortages of the structure, technology, policy, talent and so on in energy industry. Then based on these shortages we explored the optimal path of industrial structure for energy saving.
Analysis of Wind Field Fan Based on Performance Enhancement Method
Authors: Tan Xiao Long , Zhou Jia , Wang Wen Bin
Published: July 2014

For the simulation of wind turbine, the wind speed is extremely important parameters and indicators to measure the output power of the unit is the wind load. Therefore, in the airflow dynamics and simulation of wind loads before establishing an accurate wind speed model is crucial. At present, the application for wind turbines COMSOL fan, fan blades and wind load simulation field, the extremely important wind speed model is not perfect, most of the research is confined to a single constant wind speed, wind speed virtually ignored the magnitude and direction of change, on changes over time and space at the same time is one of the few studies of wind, so find a way to accurately describe the range of wind speeds, and can be combined well with COMSOL method can greatly improve the aerodynamic performance of wind turbines the overall level of .
Cloning and Analysis of MeCWINV6 Promoter from Biofuel Plant Cassava (Manihot esculenta Crantz)
Authors: Liu Jiao , Xia Wen Rui , Hu Yan Ping , Yao Yuan , Fu Shao Ping , Duan Rui Jun , Li Rui Mei , Guo Jian Chun
Published: July 2014

In order to gain insight into the specific function of the cassava cell wall invertase 6 (MeCWINV6), the promoter sequence of MeCWINV6 gene was cloned using the PCR amplification approach. 118 bp CDS sequence and 1042 bp potential promoter sequence of MeCWINV6 gene were obtained. PlantCARE analyzed the putative cis-elements in silico revealed that these elements can be grouped into five classes: basic transcription elements (CAAT box and TATA box), light responsive elements (ACE, AE-box, ATCT-motif, AT1-motif, Box 4, GAG-motif, GT1-motif and Sp1), phytohormone responsive motifs (GARE-motif, TATC-box, TGACG-motif and TCA-element), defense and stress responsive element (TC-rich repeats and HSE), wounding and pathogen responsive elements (W-box and WUN-motif). This data demonstrate that it might be associated to regulate the cell wall invertase gene function in source-sink relations of cassava starch accumulation and response to internal and environmental stimuli.
Distributed Energy Resource Impacts on FLISR Scheme in Distribution System
Authors: Liu Hai Tao , Yu Hui , Lu Yi Ming , Lv Guang Xian , Chen Yu , Zhang Xin Hui
Published: July 2014

The key distribution automation (DA) application for implementing a self-healing smart distribution network is the fault location isolation and service restoration (FLISR) application. With DGs introduce significantly more variability into distribution system power flows, it has a great impact to FLISR. Based on summarizing the existing FLISR scheme, this paper analyses the influence of fault detection and service restoration with large-scale DGs.
Z-Transform Implementation of the CFS-PML for Truncating 3D Meta-Material FDTD Domains
Authors: Yue Yong Qing , Zhu Chun Hui , Feng Nai Xing
Published: July 2014

Efficient Z-transform implementa-tion of the complex frequency-shifted perfectly matched layer (CFS-PML) based on the stretched coordinate PML (SC-PML) formulations and the D-B formulations is proposed for truncating meta-material finite-difference time-domain (FDTD) lattices. In the proposed PML formulations, the Z-transform method is incorporated into the CFS-PML FDTD implementation. The main advantage of the proposed formulations can allow direct FDTD implementation of the Maxwell’s equations in the PML regions. A numerical test has been carried out in a three dimensions (3-D) FDTD domain to validate the proposed formulations. It is shown that the proposed formulations with CFS scheme are efficient in holding good absorbing performances.
Co-Cracking of Bio-Oil Model Compound Mixture and Ethanol with Different Blending Ratios for Bio-Gasoline Production
Authors: Zhang Li , Cai Qin Jie , Wang Shu Rong
Published: July 2014

Since the composition of crude bio-oil was complex, model compounds were usually used in the study of cracking to simulate the actual bio-oil. However, the cracking of pure model compound mixture generated an inferior oil phase which had a high content of oxygenated byproducts. When ethanol was adopted as the co-reactant, the reactant conversion, yield and quality of oil phase were obviously improved. The conversions of the reactants were 100% and the selectivity of the oil phase was 31.5wt% when the concentration of model compound mixture in the feed reached 30%. Meanwhile, the oil phase also had a superior quality which was entirely composed of aliphatic and aromatic hydrocarbons.
Fast Evaluation Method on Thermal Stability Limit of Power Grid Cross-Section
Authors: Tian Chun Zheng , Yu Lin Lin , Huang Jing Hui , Xie Yan , Shen Xu Hui , Zhang Xin
Published: July 2014

Enhanced grid structure makes the system thermal stability problems increasingly prominent. The thermal stability of grid section is deduced by use of DC power flow method in typical equivalent system, furthermore, the effect of section N-1 breaking on active power flow in operating equipment is analyzed. Based on the principle of active power flow distribution to meet the impedance proportional relationship, thermal stability limit section assessment methods and processes are presented, which can achieve fast assessment on thermal stability limits and restriction faults. Finally, the summer maximum loads mode of Henan Power Grid in 2014 is taken as example, and the thermal stability limit in northern sections is evaluated. The simulation results prove the feasibility of the proposed method. The research results can provide references for dispatchers and related software developers.
Grid Electricity Market Bidding Model Based on Agent
Authors: Ou Chao Chun , Zhang Jia Qing , Wang Xiao Hua
Published: July 2014

Grid technology can provide electricity market bidding to achieve the ability to provide large-scale computing. Agent technology has the autonomy, interoperability, and self-learning, can effectively solve the grid resource discovery and management, computing task allocation and scheduling problems, shared grid environment of heterogeneous computing resources. Introduction grid technology related content, Agent technology and proposes a use of Agent technology in the electricity market bidding model grid environment. Bidding able to provide the technology platform the parties a fair trade.
Composite Electrolyte Containing Binary Ionic Liquids and LiDFOB Additive on the Performance of Graphite Anode in Li-Ion Battery
Authors: Wang Zhen Feng , Zhang Xiao Xue , Li Cui Hua , Liu Jian Hong , Zhang Qian Ling
Published: July 2014

A new composite electrolyte for lithium-ion batteries (LIBS) was prepared by combining N-methyl-N-propylpyrrolidinium bis (trifluoromethanesulfonyl) imide (PYR13TFSI), N-methyl-N-pr-opylpiperidinium bis (trifluoromethanesulfonyl) imide (PP13TFSI) and lithium difluoro (oxalate) bor-ate (LiDFOB). Graphite electrode was tested in the LiDFOB-containing electrolyte, exhibiting higher reversible charge/discharge capacity and better cyclic stability. An initial charge capacity of 351.5 mAh⋅g-1 is obtained and a stable capacity of above 332.8 mAh⋅g-1 is retained after 30 cycles. The coulombic efficiency remains high above 99.3%. The outstanding cell performance was associ-ated with the formation of stable solid electrolyte interface (SEI) film on the surface of electrodes derived from LiDFOB.
Lightning Impulse Voltage Correction of Power Transmission and Transformation Project Typical Gap
Authors: Peng Ying Jie , Ding Yu Jian , Lü Fang Cheng
Published: July 2014

External insulation design of UHV power project is important. The lightning impulse (LI) voltage is one of the main factors that determine the air gap distance. Based on existing LI voltage results of power project typical gap, impact of gap structure and distance on LI discharge correction is analyzed. And from a theoretical aspect, existing LI discharge correction methods are summarized. Furthermore, by the use of common correction methods, LI voltage correction factors of rod - plane were calculated and analyzed. Results show no significant impact of gap type or gap distance on LI voltage correction is found out. Average atmospheric conditions are effective when atmospheric parameters method is used for LI voltage correction. DL/T 620, IEC 60060-1 and IEC 60071-2 can be used for LI voltage correction at areas with altitudes of 1000-5000m. While GB311.3-improvement method can be used for LI voltage correction at areas with altitudes blow 4000m.
Line Vulnerability Assessment on Power Grid Based on Combination Weighing Method
Authors: Zeng Xin , Chen Yan Zhen , Yang Qi , Miao Miao , Ren Jian Wen , Li Xuan Xuan
Published: July 2014

To study the mechanism of cascading failures in a power grid and find out the key vulnerable lines propagating cascading failures, entropy theory and analysis hierarchy process were applied in entropy-weighted fuzzy comprehensive evaluation model, and information of objective data and the subjective opinion of experts were combined in the model to implement effective evaluation and sorting of line vulnerability. The article builds a index system that contains voltage deviation, power flow coefficient and electric betweenness in considering the network structure and real-time running state of the system, and then the lines vulnerability assessment method is proposed .This method can be used to help power grid designers and operators spot the lines prone to black-out. Numerical example results show that the proposed indicators can overcome the deficiency of existing indicators not taking the state of the grid structure and operation into account which proves the assessment method is feasible.
Medium and Long Term Load Forecasting of Power System Based on Interval Taylor Model Arithmetic
Authors: Zheng Zhi Jie , Wang Shou Xiang , Wang Yan , Zhao Long , Zhang Jie
Published: July 2014

For long time span, the impact of many factors, uncertainties and other characteristics of mid-long term load forecasting, as well as the over-estimation of interval arithmetic, a mid-long term load forecasting method based on interval Taylor model algorithm was presented. In order to avoid misjudgment of the relationship between variables, reducing over-estimation problem, a global variable named Taylor model ID was presented to identify the independent variables and the dependent variable. The same independent variables construct the interval Taylor model only once. Use Maclaurin formula to derive the interval Taylor model of correlation function formula, and then get a quadratic exponential smoothing method based on interval the Taylor model. The proposed method has been tested on a provincial calculation. The results demonstrated the effectiveness and practical value of the approach by comparing with the results of Monte Carlo simulation and interval method.
Micro-Grid Fault Transient Characteristics and Relay Protection
Authors: Chen Fen Fen , Xiao Shi Wu
Published: July 2014

Micro grid can minish the impact from fluctuation of distributed generator by control and management system as a new type of power system. But micro-grid also brings disadvantages on power attemperation, function and relay protection. Firstly the inverter’s electric model is built and the fault transient is simulated. Inverter interfaced distributed generator shows evident non-linear characteristic for the limits on power and current from control system. In this paper, according to the fault transient simulation results, analysis of the problems faced by the existing relay protection and corresponding solutions is given respectively.
Optimal Capacitors Placement of Distribution Systems Using 2nd Order Power Loss Sensitivity Analysis and Hierarchical Clustering
Authors: Gao Hui Min , Zhang Jian Min , Wu Chen Xi
Published: July 2014

Heuristic methods by first order sensitivity analysis are often used to determine location of capacitors of distribution power system. The selected nodes by first order sensitivity analysis often have virtual high by first order sensitivities, which could not obtain the optimal results. This paper presents an effective method to optimally determine the location and capacities of capacitors of distribution systems, based on an innovative approach by the second order sensitivity analysis and hierarchical clustering. The approach determines the location by the second order sensitivity analysis. Comparing with the traditional method, the new method considers the nonlinear factor of power flow equation and the impact of the latter selected compensation nodes on the previously selected compensation location. This method is tested on a 28-bus distribution system. Digital simulation results show that the reactive power optimization plan with the proposed method is more economic while maintaining the same level of effectiveness.