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检索条件"机构=The Key Laboratory of Modern Power System Simulation and Control"

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A novel algorithm for distribution network reconfiguration based on evolutionary programming

A novel algorithm for distribution network reconfiguration b...

引用

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...

引用

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...

引用

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...

引用

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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A Grid-Connection control Scheme of PV system with Fluctuant Reactive Load

A Grid-Connection Control Scheme of PV System with Fluctuant...

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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： Bin Li Xiaohe Tian Hongyan Zeng Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

The fluctuations of reactive load in micro-grid will have a great impact on the supply *** this paper,a novel grid-connection control is proposed in view of this problem,based on a model of a PV system with load paralleled in large *** can not only make full use of photovoltaic power,but also maintain a stable voltage with a fluctuant reactive *** adopted double-loop principle in inverter *** gridconnected current of the PV system and the current of large system are both decoupled into active and reactive component by abc/dq0 transformation to achieve the independent control of active and reactive *** the one hand,the active component of the PV grid-connected current is adjusted to the reference value given by the Maximum power Point Tracking (MPPT) in order to maintain maximum active power output of PV,the reactive component of the large system current is adjusted in order to maintain a constant reactive power *** a stable supply voltage can be maintained with a fluctuant reactive load,as the supply voltage of the grid-connected PV system is mainly sustained by the large *** the other hand，the main circuit topology of three-phase reactive power compensation device and three-phase grid-connected inverter is exactly the ***,in support of a reasonable control strategy it can be integrated together with both function of grid connection and reactive power compensation *** can ensure a stable voltage in the PV system with a fluctuant reactive load paralleled in large system by the regulation of *** advantages compared with the simple and traditional unitypower-factor inverter control scheme are validated by simulation with Matlab/Simulink.

关键词： component:PV system:control scheme:reactive load:grid-connection

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Analysis of directional pilot protection on transmission line with wind farm integration

Analysis of directional pilot protection on transmission lin...

引用

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

作者： Bin Li Meng Lin Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University 300072 China

Increased integration of wind power makes higher demands on the stability and protection of power system. Wind farms are connected to power grid through transmission line. When single-phase fault occurs on the line, positive and negative sequence currents are not equal and are much smaller than zero sequence current. Phase selector based on the theory of current- difference sudden-change may mistake single-phase fault for phase-to-phase fault because positive and negative branch coefficients are not equal. Considering a case of mal-operation of directional pilot protection, the paper studies the impedance characteristics of asynchronous wind generator, analyzes the causes of weak feed and different branch coefficients, and explains their contribution to fault phase selector's mal-operation. The results are validated by simulation and an improvement for fault phase selection with wind farm integration is proposed.

关键词： Circuit faults Wind farms Impedance Feeds Wind power generation power transmission lines Generators

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A neutral-point potential balancing algorithm for five-level ANPC converters

A neutral-point potential balancing algorithm for five-level...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Kui Wang Yongdong Li Zedong Zheng State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

Five-level active neutral-point-clamped (ANPC) converter is a newly emerging topology which can overcome the drawbacks of traditional neutral-point clamped (NPC) converters and flying-capacitor (FC) converters. Its dc-link is subdivided into two equal parts and the main problem is the neutral-point (NP) potential balancing. In this paper, a NP potential balancing algorithm based on zero-sequence voltage injection is presented. By calculating the NP currents of all key zero-sequence voltages, the most appropriate zero-sequence voltage is selected to generate the demanded NP current. Moreover, by further limiting the span of injected zero-sequence voltages, the NP balancing algorithm can make the two IGBTs connected in series operate at fundamental frequency. A three-phase five-level ANPC inverter prototype was built up and experimental results are presented to verify the validity of this algorithm.

关键词： Capacitors Electric potential Switches Voltage control Inverters Insulated gate bipolar transistors Heuristic algorithms

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Cooperative Grid Modeling for Interconnected Multilevel Multi-area power systems

Cooperative Grid Modeling for Interconnected Multilevel Mult...

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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： ZHANG Jia-an ZHANG Na Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072China

With the formation of large-scale interconnected power systems,the grid structure and operation mode are becoming increasingly ***,the power network model is maintained by distribution centers respectively according to the scope of *** power system analysis,the model data of the whole network is necessary,while only the internal data is transparent to a distribution center and the external data is not accessible ***,the model data from distribution centers must be integrated in a high-level distribution *** a traditional approach cannot meet the efficiency requirements for large power grid *** paper presents a method of network data modeling and maintenance for multi-level multi-area power systems,in which the local model data are maintained in each distribution center,the connection model is maintained in a higher level of distribution center,and all centers work *** a distribution center,the graphic modeling tools should be supported and the local model data can be maintained manually or exported from the *** the method,some technologies are considered,such as model data interfacing,version management,model data maintenance,*** modeling is helpful to improve the analysis efficiency and to reduce the burden of model data maintenance for large power grids.

关键词： power system:cooperative modeling :operation mode:model data interfacing:model data integration:version management:model data maintanence

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Harmonic Analysis of the Interconnection of Wind Farm

Harmonic Analysis of the Interconnection of Wind Farm

引用

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

作者： Jidong Wang Xuhao Du Guodong Li Guanqing Yang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin Electric Power Science & Research Institute

With the large-scale wind farms accessing systems continuously and a wide range of variable speed wind turbines' application, the harmonic problems caused by the interconnection of wind farms have got more and more attention. This paper analyzes the harmonic mechanism caused by wind farms connected with the grid;based on Dig SILENT / power Factory simulation platform, establishes a permanent magnet direct drive wind turbine model. Finally, the harmonic simulation of an actual example for a wind farm connected with the grid is given in this paper. simulation results show that the second harmonic current of the wind farm accessing point and the third harmonic current of point of common coupling are exceeded, which should be suppressed;the contents of other harmonics are in the allowed range of Chinese National Standard.

关键词： wind farm interconnection harmonic simulation

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Numerical simulation on Small Scale Straight-blade and Twisted-blade Vertical Axis Wind Turbine

Numerical Simulation on Small Scale Straight-blade and Twist...

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2011 International Conference on Energy and Environment(ICEE 2011)

作者： Lv Yongzhe Jiang Dongxiang Jiang Yong State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University

This paper presents an analysis on the performance of vertical axis wind turbine of two types, namely straightblade vertical axis wind turbine(SB-VAWT) and twisted-blade vertical axis wind turbine(TB-VAWT). An attempt of this simulation is to identify which type performs better in the same wind conditions and swept area. Three-dimensional computational fluid dynamics(CFD) was adopted in this analysis, after solid models of them were generated. Preliminary results of torque, power and aerodynamics in the fluid field were obtained for discussion. Finally, there provided some guidance for future wind tunnel tests.

关键词： straight-blade vertical axis wind turbine twistedblade vertical axis wind turbine numerical simulation performance aerodynamics

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