bluuebunny/crossref_metadata_2025 huggingface dataset:
Analogy Teaching Method of High-Frequency Electronic Circuit
Authors: Xu Zhuo Nong , Zhang Ling Tao
Published: July 2014

High-frequency electronic circuit is an important basic specialized course for the major of electronic information engineering, communication engineering, and electronic science and technology. Combined with a dozen years of classroom teaching experience and started from several aspects like relevancy of front-back courses, teaching framework and theoretical teaching content, this paper will discuss analogy teaching method of related content about signal amplifier, mixing, modulation and demodulation in order to help students to understand chapter structure. In the process of teaching, we should pay more attention to students ' weaknesses of knowledge, then stimulate their interests in learning and improve the teaching effectively quality.
Analysis of Lithium Battery Model for Electric Vehicle
Authors: Chen Yi Ning , Zhang Juan , Guo Chong
Published: July 2014

The establishment of an accurate battery model is crucial to the design and research of battery and battery management system. This paper takes 180Ah LiFePO4 as research object, adopts PNGV model to describe the working characteristics of the battery,establishes PNGV simulation model in MATLAB/Simulink, recognizes the model parameters based on the experiment of HPPC pulse, verifies the accuracy of model in different conditions. The results show that PNGV model can show the dynamic characteristic of battery well.
Application of Dual Switch Flyback Converter in Three-Phase Photovoltaic Inverter
Authors: Yi Chun Yang , Liao Tian Fa , Ma Qian Jin , Dong Chang Wen , Xue Jia Xiang
Published: July 2014

Auxiliary power of Three-phase photovoltaic inverter is supplied by solar cells with wide input ranging from 140V to 1000V.The conventional single-switch flyback converter exists too high voltage stress in power switch to be applied in this inverter. This paper presents a dual-switch flyback converter in which the voltage stress of each switch is slightly higher than the input voltage when switches turn off, at the same time , the leakage inductance energy is recycled back into the inputside; otherwise, this topology needs no snubber circuit, so it is much more efficient than single switch flyback. The dual switch flyback converter with seven outputs is successfully applied in 10KW three phase PV inverter.
Both Spatial and Temporal Distortions Caused by Spatial Chirp in Vortex Femtosecond Pulse Beams
Authors: Nie Yong Ming , Guo Ya Kun , TAN Feng Lei , Sun Fuan
Published: July 2014

Spatial chirp will cause temporal width broadening and wave front aberration with the femtosecond pulse beam. So effectively controlling and utilizing the spatial chirp has great significance. In this manuscript, the properties of the spatial chirp are theoretically investigated. An experimental setup which can easily control the spatial chirp of the femtosecond laser pulse beam and generate vortex femtosecond pulse beam with different spatial chirp parameters is proposed. The relationships between the spatial chirp and the temporal and spatial properties including the cross section intensity distributions and the temporal width and chirp of the femtosecond pulse beams are obtained. Both theoretical and experimental results indicate that as the spatial chirp parameter becomes larger, both the temporal and spatial pulse beam widths are broadening and the wave front aberration also becomes larger quickly. Moreover, the temporal chirp is also becoming larger when the spatial chirp parameter becomes larger. The spatial chirp properties of vortex and Gaussian femtosecond pulse beams are similar with each other.
Calculation of Leakage Magnetic Field and Short-Circuit Impedance of Power Transformer
Authors: Han Fang Xu , Li Yan , Sun Xin , Li Longnv
Published: July 2014

The leakage magnetic field and equivalent circuit model of OLTC double-winding power transformer has been established by electromagnetic field Finite Element analysis software. The method of field-circuit coupled method has been used to calculate its magnetic field leakage, the short circuit impedance obtained by the calculation of formula and compared with the experimental data. At the same time, based on the calculation method for the Visual Basic language as a tool for MAGNET software for secondary development, obtain the software to calculate the short-circuit impedance of power transformer simulation software, and is verified by using the typical products, proves the validity of this software.
Circuit Design of Electronic Igniter of MCU Used in Biogas Power Generation
Authors: Yu Liu
Published: July 2014

According to the technical requirement of biogas power generation system, introducing the working principle of electronic igniter which is controlled by MCU; Designing and developing the electronic igniter which used STC 89 C-52 RC MCU as the core;Having completed the hardware circuit designs of power supply module, main control module and ignition module of electronic igniter. After testing the signal of circuit, it meets the technical requirements of biogas power generation system.
Design of a Fixed-Frequency Beam-Scanning Antenna Controlled by Voltage
Authors: Wu Rui Kun , Chen Guo Tai
Published: July 2014

A microstrip leaky wave antenna with operating frequency 2.5GHz is designed based on composite right/left handed transmission line. The beam scanning of the antenna can be controlled by changing the bias voltage of varactor in the antenna. And the performance, S-parameters and horizontal polarization pattern, of the antenna are investigated by simulation and experimental measurement, respectively. The results show that the designed antenna has better beam scanning, which is proper to be used in wireless local area networks and short-range wireless technology.
Design Research of Unit Power Factor Power Converter
Authors: Sun Wei , Wu Kui Hua , Yang Bo , Liang Rong , Wang Jian , Wang Fei
Published: July 2014

In view of the problems that traditional direct current control calculation is complex, that sensor precision requirements are high. This paper proposes a new control method of unit power factor power converter, which is easy to realize with simple control structure dispense with current sensor. Through the simulation and experimental verification, the control strategy can achieve unity power factor control, and the harmonic content is small and the operation is stable.
Research on Harm of Harmonics on Electrical Equipment
Authors: Gong Chen Bin , Wang Qing Hao , Chen Gang , Wang En Lu , Hai Tian Shu , Li Xin Yu , Li Bo , Wang Xue , Liu Chen Yang , Zhao Qi Dong
Published: July 2014

Through the analysis of harmonics caused by transformer, capacitor, electromagnetic voltage transformer and other accident, harmonics is an important indicator of power quality, which has been included in the “pollution" of power grid is found. In order to understand the harmonic, this paper from the concept of quality of electric energy, and then gradually extended to the field of harmonics. This paper firstly introduces the various reasons and equipment may produce harmonic, Secondly, illustrate harm of harmonic to operation of transformers, capacitors, electromagnetic voltage transformers and other electrical equipment, let more people know and understand the relevant knowledge of the harmonic, In order to save technical force and provide scientific basis for future effective harmonic.
Research on the Three-Level Inverter Midpoint Potential Algorithm Based on the Charge Balance Theory
Authors: Huang Sun Wei , Wang Yue Yu , Shi Jin
Published: July 2014

In order to achieve high voltage, high-power,two-level inverter need to switch in series which results switch static, dynamic-pressure problems. Three-level inverter solve this problem for its circuit, but this circuit has the midpoint potential imbalances of the DC side, we propose to charge balance theory based on the three-level inverter midpoint potential algorithm to solve the problem, build simulation model to validate the algorithm on the midpoint potential in MATLAB.
Simulation of Function Generator
Authors: Tan Xiao Long , Zhou Jia , Wang Wen Bin
Published: July 2014

The function generator is the classic analog adder circuit, either independently or as an intermediate for its links embedded in complex circuits, have a very wide range of applications. Function generator can be used as the signal source to produce for research, teaching, experimental signals for different purposes such as how to make it more accurate and stable signal generation, has been widespread concern and research; Similarly, construction work adder circuit commonly used as a module, accurate input-output relationship is also very worth exploring. Therefore, this paper, on both a profound theoretical analysis, based on the modeling and simulation through the more figurative exposition of both operating characteristics, application to increase its theoretical basis.
Study on Experimental System for Three Level Neutral-Point-Clamped Converter
Authors: Han Gang , Zhang Jian Wen , Cai Xu
Published: July 2014

This paper focuses on the digital experimental system for neutral-point-clamped three-level converter. First, SVM’s digital implementation method is studied. As neutral-point voltage unbalance is an inherent problem for this topology, a practical capacitor voltage balance method is present. This method uses a variable factor as the small vectors’ adjustment coefficient, which is calculated by PI controller with capacitor voltage deviation. Then, a digital modular control system is proposed, in which both hardware and software system structures are designed in modular. The digital control system adopts high speed optical-fiber communication between a master controller and multiple sub-controllers, and realized the effective and rapid control of the experimental prototype finally.
Study on Simulation of Temperature Field and Optimization of Structure to Grounding Resistor
Authors: He Da Jiang , Shao Peng Fei , Yang Hen Ling , Xiao Jing , Qu Jun
Published: July 2014

According to the structure of grounding resistor, the flow-current experiments of alloy materials which have different performance and specification have been done in the condition of simulation grounding fault. Based on the experiments, the simulation models of temperature field have been constructed; the distribution characteristics of the transient temperature field and the structure optimization of Grounding Resistor have been studied and discussed by the simulation models. The research results have a great engineering application value on the optimization of performance, the choice of the materials, the cost saving and the improvement of design efficiency to grounding resistor.
Study on the Lithium-Ion Batteries Performance of Electric Vehicles
Authors: Lu Jun Min , Wang Xiao Kan
Published: July 2014

By comprehensive analyzing the lead-acid batteries development situation of electric vehicle at first, and making a comprehensive comparison for the performances and features of the lead-acid batteries, nickel hydrogen batteries and lithium-ion batteries, then studying the charge and discharge performance of the lithium batteries which provides technical support and references for the application and popularization of lithium-ion batteries in electric vehicles.
The Technology Study of New Asymmetrical Half-Bridge Converter
Authors: Wu Yue Fen
Published: July 2014

Because the shortcomings of the common asymmetrical half-bridge circuit can't achieve soft switch and has DC bias for the transformer, the paper studies a new asymmetrical half-bridge circuit. Compared with the traditional asymmetrical half-bridge circuit, the circuit is added an auxiliary switch and diode by the composition of the slip. Thus the converter can achieve the control strategy of symmetric PWM. At last the simulation results show that the theoretical analysis is correct.
Capacity Configuration and Energy Control Strategy of Stationary Super Capacitor Energy Storage System of Urban Rail Transit
Authors: Wang Bin , Yang Zhong Ping , Lin Fei
Published: July 2014

The installation of super capacitor in urban rail transit system allows the recovery of the braking energy for increasing the energy efficiency as well as a better pantograph voltage profile. An energy control strategy of the energy storage system which is suitable for the urban railway transit is proposed in this paper. Then, the methodology of capacity configuration is put forward based on the simulation platform in Matlab environment. Ultimately, the capacity configuration results of super capacitor energy storage system are determined based on parameters of an actual metro line under different traffic conditions.
Computation and Analysis of Static and Dynamic Radial Stability of Power Transformer Inner Winding
Authors: Sun Xin , Li Yan , Han Fang Xu , Li Jian
Published: July 2014

In this paper, the size of winding electromagnetic force after short circuit has been acquired through leakage field calculation and analysis on power transformer, and based on the computation results, the radial stability experimental results of large capacity power transformer inner winding short-circuit model were compared to the simulation values to guide actual product analysis and checking. With the accumulated simulation experience on this model, then a type of sfz9-80MVA power transformer inner coil static and dynamic stability has been checked to confirm the radial instability phenomenon could whether or not occur on this product.
Design of the Three-Phase Photovoltaic Grid-Connected Inverter
Authors: Wu Kui Hua , Sun Wei , Wang Jian , Yang Shen Quan , Wang Yi Qun , Li Bo
Published: July 2014

Photovoltaic grid-connected power generation is the inevitable development trend of solar photovoltaic systems,grid inverter is an essential part of photovoltaic grid-connected power generation. With the developed three phase current type PWM inverter device as the research object, and symmetry rules sampling method is applied to the inverter, through the method combined by the computer simulation and experiment research, the device was verified by simulation and experimental .The results show that: This method could not only effectively reduce the DC side inductance volume of the current-mode PWM inverter , and it could make output AC currents sinusoidal and in phase with grid voltages, but also improve the efficiency of the system, it will be more suitable for photovoltaic grid-connected.
Discussion Based on Small PABX Lightning Overvoltage
Authors: Sun Guo Feng , Bai Yan
Published: July 2014

Construction of large and medium-sized program-controlled switches be placed strictly in accordance with national standards Professional program-controlled switchboard in the room, general will not be affected by lightning overvoltage and harm of operating over voltage. And small PABX are commonly used for smaller enterprises and institutions, such enterprises are unlikely to build professional for program-controlled switchboard room. Mostly I placed it on the corner of the Office or the Office area, convenient pin-outs. As a result of this device is undersized and lower prices, lightning protection concepts and enterprises and institutions to understand enough, it will not attach too much importance to. During the thunderstorm-prone season often makes their lightning overvoltage damage, direct economic loss was not too large, but the indirect economic losses are direct losses many times. This article in view of the characteristics of this equipment, according to the wiring form of power supply system using proper surge protection devices, equipotential bonding, shielding and grounding, and other combinations of several methods, and do not put too much financial and material resources to avoid accidents from happening, the various types of losses to a minimum.
Wide-Band Modeling of the IGBT Module Based on the Physical Structure
Authors: Sun Hai Feng , Wu Xiao Ming , Zheng Chen Da , Liu Xiao Qian
Published: July 2014

This paper presents a new modeling method, based on the physical structure of the IGBT module, considering the distribution parameters of high frequency.This method is simple and the wideband model has physical meaning, by choosing suitable model initial parameters as well as the objective function which use the iterative optimization algorithm to solve the model parameters.Comparing the wideband model with the measured results ,the wideband model maintain high accuracy in the range of 100KHz ~ 20MHz.
Efficiency Analysis for a Two-Stage Three-Phase Inverter
Authors: Geng Pan , Ye Yin Zhong , Wu Wei Min , Liu Yi Jian , Xue Shi Long
Published: July 2014

This paper takes a two-stage three-phase inverter as an example. The efficiency calculation method is analyzed in detail for the inverter, and the power losses calculation method is proposed for the second stage under SVPWM. A 10kW/380V inverter system is designed. The system efficiency and the power losses for every part are theoretically calculated. Finally, experiments on a 10 kW prototype are carried out to verify the calculation.
Influence of Transformer Capacity on Insulator Leakage Current Acquisition Results
Authors: Miao Peng Chao , Xu Zhi Niu
Published: July 2014

To study the influence of test transformer capacity on insulator leakage current acquisition results, leakage current acquisition experiments with the clean and dry insulator and the water drops attached insulator were conducted based on the sampling resistor method and the test transformers of different capacities whose models are YDTW-1200 kVA/300 kV, YDTW-50 kVA/250 kV, YDTW-10 kVA/100 kV, YDJ-5 kVA/50 kV respectively. To make the results more reliable, sampling resistors with different resistances, 10 Ω, 100 Ω, and 1 kΩ, were used to collect the leakage current. The root-mean-square (RMS) values of the leakage current, the ratio of the 3rd harmonic to the fundamental (K3) and the 5th harmonic to the fundamental (K5) were extracted from the measured data. And it was discovered that the transformer capacities has a very slight influence on the leakage current RMS value but has a great impact on the value of K3 and the K5. The maximum K3 are approximately 3 times of the minimum K3 and the maximum K5 are approximately 9 times of the minimum K5.
Research on the Influence of Closing Resistor inside Circuit Breaker on Magnetizing Inrush Current of UHV Transformer
Authors: Guo Zhen , Zhang Hui Yuan , Wang Bo , Gong Ren Min , Zhang Yong Hao
Published: July 2014

Using Matlab/Simulink software established the simulation model of UHV transformer and UHV power grid.The characteristic of magnetizing inrush current for UHV transformer was obtained by simulation.The paper also analyzed the impact on differential protection from it. Closing resistor inside circuit breaker method was proposed to restrain magnetizing inrush current.The method cuts down the amplitude and accelerated the attenuation speed of it, so as to restrain it. The simulation analysis verified the effectiveness of the method.
An Empirical Analysis on Guangdong’s FDI, Energy Intensity and Industrialization
Authors: Liao Xin Lin
Published: July 2014

Energy is the base of modern industrial economy. Basing on the data of cities and industries in Guangdong from 2000 to 2013, this paper analyzes the relationship of energy intensity, FDI and industrialization by regression model. The results show that the industrialization levels of the cities in Guangdong are in accordance with their energy consumption and economic conditions, and Guangdong should focus on the development of “win-win” industries which both increasing industrial output and reducing energy efficiency.
Two-Port Characteristic Analysis for Transformers with the Large Scale Windings Based on Sparse Matrix
Authors: Zhang Xu Dong , Yuan Jian Ye , Zhang Jing Ping , Feng Jian Ying
Published: July 2014

In order to calculate the two-port wide frequency parameters of a large transformer quickly and accurately, parameter calculation of multi-conductor transmission lines model is proposed based on the sparse matrix operation. It solved the problem caused by the large matrix. Firstly, multi-conductor transmission lines model of the transformer windings is established. Secondly, matrix characteristics ofYandZis analyzed, based on which the block storage and computation method is applied. Then the frequency-domain model is solved based on sparse matrix operation. At last, taking a SS11-20000/110 transformer as an example, the correctness of this method has been verified by comparing calculation results with measurement results.
An Optimal Power Allocation for the Two-Way Relay System Using Physical-Layer Network Coding
Authors: Yuan Ren Gang , Chu Li Li , Li Chuang , Cao Ling Li
Published: July 2014

In this letter, an optimal power allocation in the two-way relay channel of four transmission nodes employing the physical-layer network coding (PNC) protocol is proposed to improve the network sum-rate of the two-way relay system. The optimal power allocation is obtained by maximizing the network sum-rate of the PNC protocol under a sum-power constraint in a Rayleigh fading channel environment. Analytical and simulation results show that the proposed power allocation can improve the network sum-rate. Furthermore, compared with the equal power allocation scheme, the proposed power allocation scheme can achieve much higher network sum-rate performance.
Virtual-MIMO Cooperation Communication Based on Integrated Power Line and Wireless Communication System
Authors: Wang Yi , Zhen Shan , Hou Xing Zhe , Sun Hong Liang , Luo Kai Bo , Zhou Tan Jie
Published: July 2014

Power line communication (PLC) is a competitive technology in broad band access services and smart grids considering it widely distribution and low infrastructure built cost. This paper proposes a new PLC virtual MIMO cooperation system merged with the wireless communication to improve the reliability and capacity performance of conventional PLC system. A wireless interface is integrated in the conventional PLC modems. The nearby PLC modems constitute a V-MIMO module to share their transmitting information via the wireless link. The PLC modem in different V-MIMO module can communicate with each other through power line. The outage probability and capacity simulation results prove that new system can significantly increase the PLC system throughput and the link reliability.
Research on Nuclear Power Station Video Conferencing System from “Standard Definition” to “High Definition”
Authors: Zeng Xie
Published: July 2014

Transition is a natural law which means the things gradually developed from one stage to another. It comes to be a natural and logical thing when it moves towards the right direction. In this paper, we will take the nuclear power station video conference room contribution as an example to comb the management of video conference room from three parts: the limitations of “Standard-Definition”, the excellence of “High-Definition” and the necessity of transition. It also discusses the feasibility of nuclear power station’s High-Definition video conferencing system.
Application of Virtualization Technology in Nuclear Power Plant
Authors: Zhang Qiu , Wang Xiao Hua , Ou Chao Chun , Luo Jin Fei
Published: July 2014

Virtualization is the basic physical computer hardware that related modules in the virtual basis rather than the real independent operation to realize the simplified and optimization management of resources. This paper reviews the historical development of virtualization technology and the compare of mainstream realization manners which are the basis for comparative analysis. At the end of this paper we study a feasible mean for the disaster recovery backup solution in nuclear power plant.
Analysis of Arc Suppression Coil Accident in Fushun Zhongzhai 66kV Substation
Authors: Liu Chen Yang , Zhang Yun Shan , Wang Qing Hao , Guan Ling , Zhang Hua , Shan Yi , Liu Guo Bin , Liu Bo , Li Zhi , Ge Chang Xin
Published: July 2014

Through the analysis of 66kV arc suppression coil smoke accident in Fushun Zhong Zhai 220kV substation,scientifically pointed out that the accident was due to leave hidden trouble in the process of design and manufacture of cause.This paper introduces the working principle of arc suppression coil and use value, and cites several reasons can cause arc suppression coil accidents.This paper introduces in detail the whole process of hoisting core checks after the accident in Liao Ning Yongtai Transformer Manufacturing Co., Ltd,and carefully check the chromatography test data and the operation report before and after the accident, proveing the results of the analysis of the accident is correct.
Solving Economic Dispatch Problem in Energy Internet Using a Two-Level Stochastic Gossip-Based Consensus Algorithm
Authors: Meng Jie , Zhang Yan , Zhang Tao
Published: July 2014

In the future, energy Internet will gradually replace the traditional power network since it enables flexible energy sharing for consumers. Consensus algorithm achieved good performance in solving economic dispatch problem in microgrid system whereas the difficulty is finding a consensus variable. By means of choosing the incremental generator cost of each energy local area network (ELAN) as the consensus variable, the economic dispatch problem can be solved. Using the stochastic gossip-based algorithm as the basic framework, the economic dispatch problem can be solved in a distributed manner. In order to meeting the real-time load requirement in time under the fixed communication topology, the fluctuation of each ELAN will do the consensus update at the same time. The result of a representative case is presented to illustrate the performance of the proposed two-level stochastic gossip-based consensus algorithm.
Optimal Study of the Reverse Logistics Network for Electronic Waste under Fuzzy Environment
Authors: Sun Li Gang , Zhang Zheng
Published: July 2014

Considering the uncertainty of electronic waste recovery quantity in consumption areas, a fuzzy optimization model for electronic waste reverse logistics network with capacity constraints was constructed to determine the number and location of the facilities, the flows between each facility. A numerical example was provided to demonstrate the feasibility of the model.
The Design of Emergency Management System for Thermal Power Plant Based on B/S Architecture
Authors: Zhang Li Fang , Sun Hai Rong , Jia Hao , Dong Ze
Published: July 2014

The thermal power has a large proportion in China’s energy structure, thus, the thermal power plants can be said to be the foundation of our national economy. However, the industry characteristics of thermal power plant themselves make it to be accident-prone. In this paper, we aim at the suddenness and rapidity of emergency, combine the principle of “both prevention and response, combined with the normal and abnormal”, relay on the B/S architecture, run through the four stages of emergency management which are prevention, preparedness, response and recovery, in order to propose the overall design scheme of emergency management system for thermal power plant.
The Comparative Analysis of an Official and Experimental Building
Authors: Fan Yi Peng , Li Yu Yun , Yang Jun Zhou , Huang Rui
Published: July 2014

The simulation software DeST developed by Air Conditioning Research Group Of Tsinghua University has been used in my thesis. We use this software to simulate an official and experimental building’s energy of air conditioning and heating, then compared to the measured efficiency. We analyzed what has caused the simulated and measured energy consumption data difference, providing a reference for rationality of consumption simulation and optimization of building’s operation management.
Analysis on Capacity of Wind Power Integration into Grid Based on Power Balance
Authors: Han Liang , Li Yong Gang
Published: July 2014

Among all the factors influencing the capacity of wind power, peak regulation capability is commonly regarded as one of the most important constraint factors. From the perspective of peak regulation, the maximum peak-load regulating adequacy revised by the wind power characteristic coefficient is the limitation of the capacity of wind power. This paper proposes an assessment system on capacity of wind power integration into grid based on power balance. First of all, this assessment system takes the impact of wind power integration on the reserve capacity of the power system into consideration. Then calculate the reserve capacity based on power generation reliability index. Finally, evaluate the capacity of wind power based on the peak regulation capability of the units during the low load period. This paper analyses the capacity of wind power integration into Liaoning power grid based on power supply characteristics, load characteristics and peak-valley difference, and points out that the phenomenon of the “wind curtailment” is unavoidable. According to the specific situation of wind power limitation, this paper proposes measures to maximize the capacity of wind power.
Comprehensive Evaluation of the Offshore Wind Power Project Navigation Safety
Authors: Jiang Fu Cai , Guo Yan Bin , Ma Quan Dang
Published: July 2014

This paper introduce the necessity of the construction of offshore wind power projects, analysis of the impact on the marine transport of offshore wind power project after completion, and then use the fuzzy comprehensive evaluation method to carry out a comprehensive assessment of offshore wind power projects, by identifying risk assessment index system, establish model for risk assessment, the final task is use the model to evaluate the navigation safety of an offshore wind power project.
Countermeasure Research on New Energy Automobile Industry Chain Optimization
Authors: Wang Dong Hui
Published: July 2014

As the international energy supply remains tense, international oil price continues rising and calls for global environmental protection becomes higher, people attach more and more importance to the research and development of new energy automotive technology, and the industrialization development. Rapid industrialization led to heavy pollution, increasing greenhouse gas emission, which makes the development of new energy automobile have practical significance.
Automobile industry is an important mainstay in national economy, its industrial chain is long, correlation degree is high and the consumption pursuing is big. New energy automobile based on the gradual development of low carbon economy is a systemic revolution to the transportation that our society uses and the way of using energy, which will bring to the technical revolution of automobile industry.
Determination of Photovoltaic and Wind Turbine Capacities in an Islanded Operation Mode with Meteorological Data
Authors: Wu C.X. , Xiao H.F.
Published: July 2014

Sufficient and economical power supply is important for an islanded operation mode with renewable energy. This paper deals with the problem of optimizing photovoltaic (PV) and wind turbine (WT) capacities from the point of view of power supply reliability as well as economics. Meteorological data is analyzed, and then PV and WT capacities are optimized to supply the load reliably. The optimization is also discussed when the load profile is changes. Short-term power system operation is also analyzed. Several different cities in China with different climate features are simulated.
Doubly-Fed Wind Farm Engineering Aggregation Model Used for Planning
Authors: Dai Meng
Published: July 2014

Establishing an appropriate aggregation model of wind farm is the first step of the electrical computation in wind power integration planning. This paper first summarizes the technical requirements of wind farm model from the viewpoint of engineering, then proposes an aggregation DFIG model of wind farm. Because of the lack of measured data in the planning stage, the single equivalent model is used in this paper, and be improved by considering the equivalent collection lines model. The accuracy of the aggregation model in different electrical calculation, such as power flow, transient stability and shortcut current simulation, is verified through a sample system in DIgSILENT.
Impact of 750kV Transmission Line Series Compensation Capacity on Power Frequency Overvoltage
Authors: Wen Ding Jun , Zhang Xiu Bin , Chen Hong Gang , Jiang Feng , Sun Ya Ming
Published: July 2014

The overvoltage calculation of 750kV transmission line with series compensation has great significance on the design, insulation coordination and protection of the line. In this paper, a transient model of 750kV power transmission system with series compensation is established. Effects of different capacity on no-load capacitive rise overvoltage, single-phase grounding overvoltage, two-phase grounding overvoltage are calculated. Secondary arc current and recovery voltage of different series compensation capacity in single-phase grounding is also calculated.
Liaoning Wind Power Integration into Power System Problems Analysis and its Strategies
Authors: Wang Gang , Zhao Qing Song , Zhu Yu , Ge Yang Yang , Li Sheng Hui
Published: July 2014

For the actual situation in Liaoning Power Grid, analyzed the problems the wind power interconnection brought. Involving power quality, power fluctuations, power peaking, power delivery and so on. Proposed related coping strategies. Strengthen wind power connection management, plan the power structure scientifically and rationally, carry out multi-channel consumer of wind power actively, improve the security and stability level of the power grid.
Determination of the Collapse and Transfer Pressure for Monomolecular Layer of Copper (II) Phthalocyanine
Authors: Zhu Lin , Chen Yong Jian , Xu Feng , Cui Hai Ning , Wang Hai Shui
Published: July 2014

Systematic research on monomolecular layer of symmetrically substituted copper (II) phthalocyanine (CuPc) derivatives bas been done. An attention is focused upon final determination of the transfer pressure in an ordered nanoassembly film of CuPc by comparing different methods about surface pressure-area (-A) isotherm, morphology observation and thickness measurement by transmission electron microscopy (TEM) . The present study and improvement methods provide new insight into the choice of transfer pressure for mono molecule layer .
Optimal Configuration of Dynamic Reactive Power Compensation for Large Petrochemical Enterprise Grid
Authors: Li Si Yu , Yang Qi , Huang Jia Dong , Guo Qing Kui , Yuan Yong Yu , Sun Jian Jun
Published: July 2014

Considering different kind of external grid failures, this paper gives analysis of voltage fluctuation and flicker of large petrochemical enterprise grid. Trajectory-based time-domain dynamic simulation method is used to analyze problems of transient voltage security. A strategy for the application of STATCOM is proposed in order to improving electric power quality. The total loss of motor load of the whole system is counted and buses are sorted according to sensitivity analysis to ascertain installing sites of STATCOM. Then the optimal capacity of STATCOM can be gained by the way of solving linear programming model,which is suitable for transient voltage security under multi-faults. Test simulations show very encouraging result.
Optimization of Voltage and Reactive Power in Regional Power Network Based on MCR
Authors: Xu Xue Yong , Zhou Pan , Huang Qi Zhe , Deng Chun Ming , Shi Meng Meng , Xue Gang
Published: July 2014

Along with the increasing use of cables in power grid and the increasing ration of distributed power sources’ synchronization, such as small hydropower’s synchronization, increasing the reactive power transmission on the line, make it difficult to achieve the balance of reactive hierarchical partition. Take a certain region’s power grid for actual examples, after the installation of magnetic control reactor (MCR), using immune genetic algorithm (IGA) to coordinate the capacity of magnetic control reactor and the existing reactive power resources, the results show that the magnetic control reactor does much good to absorb the system’s excessive reactive power and limit the voltage’s increasing.
Optimized Electric Vehicle Charging Pricing Method Using Game Theory
Authors: Lu Kuan , Gao Wen Shan , Li Jing , Xue Wan Lei , Sun Wen Xue
Published: July 2014

First, behavior models of the station operator and consumer are established considering all the main factors. Second, an optimized EV charging pricing method using Game Theory is introduced based on benefit-cost analysis. The calculation of government subsidies is also proposed in order to reach an equilibrium charging price. Finally, actual data of Hebei is used and results are shown to give supports to local government and charging station operator’s decision making.
Optimizing the Allocation of the Relay Setting Related to Power Grid and over Frequency Generator Tripping Scheme
Authors: Yang Qi , Zeng Xin , Guo Qing Kui , Yuan Yong Yu , Sun Jian Jun , Ren Jian Wen
Published: July 2014

Through the summary of typical accident, the problem between the over speed protection device of thermal power unit steam turbine and over frequency generator tripping measure is analyzed in island operation of sending ends of regional grid. The optimizing allocation principle between over frequency generator tripping measure and over speed protection equipment is put forward. By a variety of program analysis and comparison, the optimizing scheme is given. Finally, the typical models of thermal power unit steam turbine over speed protection are established in software. Based on a practical power system as an example, the whole process of islanding is simulated. Checking the coordination with existing over frequency generator tripping measure and the relay setting related to power network in the islanding operation, the validity and practicability of the optimal scheme and principle are analyzed. With the method, the regional grid will remain safe and stable.
Determination of the Optical Constants of Gallium Oxide Films
Authors: Sun Chang Long , Wu Zhen Ping , Lu Shi Jie , Ren Zhen , An Yue Hua , Guo Dao You , Guo Xun Cai , Chu Xu Long , Tang Wei Hua
Published: July 2014

Transmission spectrum and reflectance spectrum have long been used to characterize gap semiconductor. Transmission spectrum can be measured very directly, but the influence of substrate absorption is often unavoidable. However, when using the reflectance spectrum measurement, the absorption of thin film, substrate absorption, and coherent interference will make the reflectance spectrum much more complicated. In this paper, Considering the absorption of thin film, substrate absorption, and coherent interference, we use the envelope curves algorithm to achieve the calculation formula of refractive index deduced from the reflectance spectrum. Through the analysis of the reflectance spectrum of Ga2O3film, we achieved thickness of the film, refractive index, extinction and absorption coefficient and dispersion constant.
Quantitative Analysis of the Relationship between Temperature and Power Load
Authors: Zhong Jian Liang , Zhao Bei , Zhang Da , Bao Hai
Published: July 2014

This paper presents the results of a study regarding the relationship between temperature and power load of the electric power system. Weather-influenced load part is picked up from original load series data with the conclusion that the lagged effect of temperature on load is within 12 hours. Furthermore, decision tree and step regression methods are employed to get a group of decision trees and corresponding regression equations which are able to quantitatively describe the relationship between load and temperature. A short-term load forecasting algorithm is then developed and its practical implementation shows this quatitative analysis method could reliably reflect the influence of the temperature changes on the load and effectively improve the accuracy of short-term load forecasting.
Reliability Evaluation Research of 10 kV Typical Configuration Feeder Based on the FMEA
Authors: Li Wen Wu , Zhu Xin Chun , Zhang Cheng
Published: July 2014

The 10kV feeder typical configuration is divided into two categories of no standby power and standby power in the paper, and subdivided into different configurations, then we use FMEA to analyze the power supply reliability of 10 kV radial lines under the different configurations, at last we compare and analyze the reliable indexes of the different equipment configuration schemes, such as the reliable rate RS-1, the system average interruption frequency AITC-1 etc. The research results show that space truss structure and switch configuration directly affect the power supply reliability of the distribution network. In the conditions of reserved auto-switch-on device and section switches automatically isolating faults, the power supply reliability rate is the highest, and the average interruption frequency and outage time are the lowest.
Research for Smart Micro-Grid System of Optimal Operation on the Island
Authors: Liu Jiao Jiao , Wang Zhi Jie , Zhang Zhen Hai , Ye Yi Zhi
Published: July 2014

The paper introduces the advantage of the application of new energy generation, and then describes the structure of a smart micro-grid system built on an island which includes wind, solar, tidal-wave energy system. The method of day-ahead optimal operation was applied to smart micro-grid system on the island to minimize the operation cost by using genetic algorithm. Taking actual datum of Shanghai Electric Group’s micro-grid for case study, the dynamic economic dispatch is compared with traditional dispatch strategy. The results verify the effectiveness of the dynamic economic.
Research on Combined Peak Load Regulation with Hydropower, Thermal Power and Nuclear Power Plants
Authors: Wang Gang , Ma Xiao Dong , Wang Chao , Ye Peng
Published: July 2014

Base on Nuclear Power Plant (NPP) participating in peak load regulation of power grid, this paper studies the operation mode of hydropower, thermal power and NPP in Combined Peak Load Regulation. The optimization model for Peaking depth of NPP was set up. The case based on actual power grid were calculated and analyzed, results of the research show that in combined peak load regulation of hydropower, thermal power and NPP, a reasonable peaking depth of NPP will effectively alleviate the peaking pressure of power grid, avoid start-stop of thermal power and abandoned water of hydropower, while ensuring the hydroelectric generating capacity in the low load periods, and ensure thermal power output smooth, it further reduce the operating costs, verify the effectiveness of the model.
Research on Energy Logistics Service Quality Management Implications to Sustainable Development
Authors: Han Fang Xu , Li Chun Fa , Yang Qi Qi
Published: July 2014

Analyzed about the present situation of energy logistics service quality, and combined with related literature at home and abroad, select “energy logistics tracking information timeliness”, “accuracy of energy logistics tracking information”, ”energy delivery time accuracy”, “energy distribution accuracy “, “energy integrity “, “error handling” six elements as a measure factors of the energy logistics service quality, establish research model. Through questionnaire investigation and quantitative analysis verify this research model. The Conclusions: energy distribution of accuracy have significant positive effects on sustainable development, and influence degree; Energy delivery time accuracy, integrity have significant positive effects on sustainable development, but the impact is relatively small; While energy logistics tracking information timeliness, accuracy and error of energy logistics tracking information treatment had no significant influence to the sustainable development of economy and society. Energy logistics is an important part of the logistics industry, also is an important support of economic society and people's life. Improve the quality of energy logistics service, to play an important role in promoting sustainable development.
Research on Flow Calculation of Wind Power Integration
Authors: Wang Yi Qun , Zhang Bo , Wu Kui Hua , Yang Shen Quan , Yang Bo
Published: July 2014

In this paper, the flow calculation problem of wind power connected to the grid was researched and the corresponding models were put forward.According to the relationship between the node voltage and reactive power of wind farms, modified the jacobian matrix.Implement and trend of the expression for calculating and according to the relationship between the node voltage and reactive power of wind farms, to modify the traditional methods of jacobian matrix and axle and consistency.Finally through the IEEE - 14 standard system, to verify this model and algorithm in this paper, satisfactory effect was obtained ,also laid the foundation for the further research.
Research on Power System Stochastic Economic Dispatch Considering Interruptible Load and Wind Power
Authors: Ma Xiao Yi , Wei Wei
Published: July 2014

Interruptible load was an important measure for demand response which can effectively implement the interaction between grid side and demand side. It’s also the important feature and component of smart grid. This paper established a stochastic economic dispatch model which brought both interruptible load and stochastic wind generation models into scheduling, and took the active and reactive power constraint of generator, the adjustable capacity constraint of interruptible load and the constraint of branch power flow into account. On the basis of Monte Carlo simulation and modified interior point method, a comprehensive optimization algorithm is proposed to tackle the above stochastic economic dispatch model. The result of IEEE 118-bus system illustrated that the proposed method can effectively curtail system’s operational cost and, to some extent, boost grid’s adaptability to wind power.
Risk Analysis of Grid Operational Performance Influencing Factors Based on ISM-Model
Authors: YUE Hai Tao , Yu Xiao Bao , He Pu Yu , Liu Hai Bo , Liu Wen Yan , Tan Zhong Fu
Published: July 2014

The ISM model is applied to the influencing factors risk analysis of grid operational performance. The research constructed multilevel hierarchical structure diagram by the association between various factors and reflected the hierarchical relationship of the index intuitively. Select a large driving force factors as the core influencing factors and develop a risk prediction radar diagram to provide a theoretical basis for grid operational performance improving. A provincial power grid company provides the data for empirical analysis to explore the applicability of the model.
Simulation on Multi-Objective Wind Power Integration Using Genetic Algorithm with Adaptive Weight
Authors: Ren Jie , Tian Jian She
Published: July 2014

Aiming at problems which were brought by large-scale wind power integration, and the problem of multi-objective reactive power optimization considering the coexistence of discrete variables and continuous variables, a method of simulation based on genetic algorithm with adaptive weight is brought out. A solving thinking presents that capacitor switching and transformer tap adjusting and other discrete equipments are first, and the action sequence of generator and dynamic reactive power compensation (DRPC) devices and other continuous equipments setting follows, which is presented that optimization problem is decomposed into continuous variable optimization and discrete variable optimization, then they are solved respectively and cross iteration until convergence. In view of the optimization complexity and the coexistence of discrete variables and continuous variables, genetic algorithm with adaptive weight is presented for finding global optimal solution. Case studies show that the proposed thinking and algorithm for solving multi-objective reactive power optimization are reasonable.