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2011 International Conference on Advanced power system Automation and Protection, APAP 2011

作者： Li, BoTong Li, YongLi Ma, Tao Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Junliangcheng Power Co. Ltd. China Huadian Tianjin 300300 China

ISBN: (纸本)9781424496198

For the access of green distributed generation(DG), LV microgrid is an important direction of development nowadays. Because the LV microgirds are in direct contact with users, so how to design its earthing scheme is the first thing to think about in order to guarantee personal safety and reliable operation of the equipments. Earthing schemes of LV mircrogrids are studied in the paper and how it works properly is presented. The principles of neutral earthing modes of microgrid is given according to standard IEC60364 and DGs neutral earthing mode is discussed under different operation modes. How the traditional protection modes of TN and TT are used in LV microgrids is studied. Considering the dispersion and variety of DGs and energy storage devices, combined earthing mode of TN and TT is proposed as a reasonable way for microgrids. © 2011 IEEE.

关键词： Earthing schemes LV microgrids Neutral earthing Protection earthing Stray current

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A self-healing reconfiguration technique for smart distribution networks with DGs

A self-healing reconfiguration technique for smart distribut...

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2nd Annual Conference on Electrical and control Engineering, ICECE 2011

作者： Li, Dapeng Wang, Shouxiang Zhan, Jie Zhao, Yishu Key Laboratory of Power System Simulation and Control Tianjin University Ministry of Education Tianjin 300072 China State Grid of China Technology College Shandong Jinan 250002 China

ISBN: (纸本)9781424481637

The requirement for power supply reliability and power quality has been increasing. When a fault occurs in distribution networks, fast locating and isolating the fault, restoring the power, and reducing outage time and area are becoming more and more crucial. The concept of fast self-healing has been proposed, which is also the requirement for smart grid development. In this paper, a self-healing reconfiguration technique is proposed for smart distribution networks with insertion of distributed generations (DGs). And a tree structure algorithm based on heuristic rules is proposed. Islands formed by DGs are used to deal with fault isolation and power restoration after a fault occurs. The effectiveness of the proposed algorithm is verified using a 26 bus bars test system with DGs. © 2011 IEEE.

关键词： Distributed power generation

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power Quality Improvement for Mircrogrid in Islanded Mode

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Procedia Engineering 2011年 23卷 174-179页

作者： Gao Xiaozhi Li Linchuan Chen Wenyan Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China

The aim of this paper is to analyze and improve the power quality of island microgrid assuming that the distributed generators could meet the load active power requirement. The main power quality problems through analysis are the harmonics caused by power-electronic devices and voltage variation caused by high reactive power requirement. Based on economy and compensation performance, a combined system constructed by SVC and SAPF is designed to improve the power quality of microgrid in this paper, in which SAPF is adopted near the microsource to mitigate harmonic currents and SVC near the load to compensate reactive power so as to relieve the voltage variation. simulation results show the effectiveness of the combined system.

关键词： v/f control scheme microgrid power quality APF SVC

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simulation of Shunt Active power Filter Using Modified SVPWM control Method

Simulation of Shunt Active Power Filter Using Modified SVPWM...

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The 2011 International Conference on Electric and Electronics (EEIC 2011)

作者： Jidong Wang Guanqing Yang Kun Liu Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University

Space vector pulse width modulation(SVPWM) was widely used in inverter control for the advantages of fixed switching frequency, full utilization of DC-link voltage and better control precision. In recent years, SVPWM is gradually applied in the control method of active power filter(APF) as the APF mains is just one invert. The voltage vectors are composed based on the α-β axis in traditional SVPWM however, in this paper one x-y composed reference axis at 60 degree angles from each other is used instead. Compared with traditional method, the principle of the method is relatively simple and easy to implement. At the same time PI regulator is adopted for the DC-link voltage control. Finally simulation results show that the APF has a better compensation effect using this control method.

关键词： active power filter(APF),space vector PWM,PI control,simulation

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simulation of Voltage Sag Detection Method Based on DQ Transformation

Simulation of Voltage Sag Detection Method Based on DQ Trans...

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The 2011 International Conference on Electric and Electronics (EEIC 2011)

作者： Jidong Wang Kun Liu Guanqing Yang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University

The rapid detection of characteristics of voltage sag is an important prerequisite for using dynamic voltage restorer(DVR) for voltage compensation. This paper introduced an improved derivation detection method based on dq transformation. simulation was performed to analyze the advantages and disadvantages of both methods and compare them. Results showed that the improved detection method had shorter delay and better waveform of detection and met the requirements of accuracy and timeliness better.

关键词： voltage sag detection method dq transformation derivation

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power Quality Improvement for Mircrogrid in Islanded Mode

Power Quality Improvement for Mircrogrid in Islanded Mode

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2011 International Conference on power Electronics and Engineering Application

作者： Gao Xiaozhi Li Linchuan Chen Wenyan Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University

关键词： v/f control scheme microgrid power quality APF SVC

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A novel algorithm for distribution network reconfiguration based on evolutionary programming

A novel algorithm for distribution network reconfiguration b...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Bingda Zhang Liu Yang Key Laboratory of Power System Simulation and Control (Tianjin University) Ministry of Education 300072 China Key Laboratory of Power System Simulation and Control (Tianjin University) Ministry of Education (of Affiliation) Tianjin China

Because there are slow evolutionary process and difficult smooth convergence in evolutionary programming algorithm, a mutation operator for distribution network reconfiguration is proposed. In order to guarantee that new individuals from mutation is close to the optimal individual actively, times of topology restructure should be inversely proportional to evolutionary generations, and both selection operators for switch to open and to close should be set in the process of topology restructure. Simplified calculation methods of power loss of network, quadratic load moment and selection operators are given. The feasibility of method proposed above is verified in the system of the operation optimization and the assistant decision of the 10kV distribution network, which is located in Shangqiu power supply bureau, Henan Province.

关键词： Switches Topology Equations Load flow analysis Programming

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Mathematical models of the system-level safe operational areas of power electronic converters in plug-in hybrid electric vehicles

Mathematical models of the system-level safe operational are...

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作者： Wang, Xuesong Bai, Hua Zhao, Zhengming Yuan, Liqiang China Power Engineering Consulting Group Corporation Beijing 100011 China Kettering University Flint MI 48504 United States State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China

With the development of plug-in hybrid electric vehicles (PHEVs), power electronics plays an increasingly important role in electric power train systems. The economic and reliable design of these power electronic systems, e.g., dc/ac inverter and battery charger, will be the inward search to popularize electric vehicles. As an extension of system-level safe operational areas (SSOAs) proposed in our previous literature, this paper details the criteria and mathematical models of SSOA for a battery charger and a three-phase two-level dc/ac inverter. Operational areas were established based on the SSOA. Thermal characteristics of the semiconductor devices, operational modes, and load characteristics were enclosed to enhance the mathematical models. Experiments on a 5-kW charger and a 55-kW/380-VAC inverter validated the effectiveness of SSOA. © 2011 IEEE.

关键词： Metals

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A Study on Capacity of Distributed Generation and its Effect on Short Circuit Current at Microgrid Operation Mode

A Study on Capacity of Distributed Generation and its Effect...

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2011 4th International Conference on Electric Utility Deregulation and Restructuring and power Technologies(第四届电力设施管制、重建及能源技术国际会议 DRPT 2011)

作者： JIN Qiang ZHANG Shuo LI Yong-li Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

Now more and more distributed generations will be connected to distributed power ***'s found that different distributed generation has its own operation characteristic such as fluctuation and *** micro-grid is to be island the voltage and frequency will change,so different control modes have been used on different distributed *** kinds of distributed generation have different behavior when system operates normally or fault *** and equivalence were adopted to deal with all kinds of the distributed generations in *** distributed generations with same control mode can be combined to an equivalent *** system operates on grid-connection mode the short circuit current relies on the capacity of grid so it is rather large for the capacity of distribution grid is much more than that of distributed *** when micro-grid operates on island mode the short circuit current may decrease to a relative small *** current protection is widely used in distribution system,and the performance of it is dependent on operation mode,so the value estimate of short circuit current is necessary for verification of credibility and *** summations of capacity were proposed to estimate the minimum and maximum short-circuit current in island.

关键词： capacity of distributed generation :equivalent capacity:short-circuit current:operation mode:over current protection

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Constant voltage control on DC bus of PV system with flywheel energy storage source (FESS)

Constant voltage control on DC bus of PV system with flywhee...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： HuiZhi Zhang YongLi Li Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University 300072 China

Fluctuation of the voltage is always the major barrier to the effective application of photovoltaic energy. In this paper, the flywheel energy storage system (FESS) is added to PV system. Considering the fluctuation of photovoltaic energy and limitation of flywheel capacity, flywheel may store energy from the photovoltaic source or AC system, or release energy to load in order to maintain the stable voltage on DC bus. Five different system operating modes and corresponding control strategies are presented in this paper. Corresponding to the different system operating modes, simulation has been done and the control strategies of FESS have been proved valid.

关键词： Industries

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