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International Conference on Critical Infrastructures, CRIS

作者： Junqiang Wei Gengyin Li Ming Zhou K L Lo Department of Mathematics North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

Available transfer capability (ATC) is defined as a measure of the system's capability for transfers of power for further commercial activity, over and above already committed uses. In practical power markets, ATC can provide important information for transmission customers, system operators and power marketers. The assessment of ATC should be carried out to assure the secure, economic, stable and reliable operation of power systems. Most of the existing ATC calculation are mainly focused on AC power system and based on deterministic techniques. As high voltage direct current (HVDC) power distribution systems have been extensively used in modem transmission network, less work has been done on evaluation of ATC in AC-DC hybrid power system. This paper is dealing with the evaluation of ATC for the integration of HVDC link with an AC power system. The mathematical model of ATC for AC-DC hybrid power system is proposed. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of hybrid power systems, several statistical indices are presented to evaluate ATC and they are calculated based on Monte Carlo simulation. states of system operation can be simulated, and the algorithm based on MATpower (A MATLAB™ power system Simulation Package) is developed in the environment of MATLAB 7.5. Case study with a modified IEEE 30-bus AC-DC hybrid power system is used to verify the presented approach. Sequential solution method is employed to deal with the AC-DC power flow. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method is effective and practical. The research achievements are undergoing to transfer to the application in other hybrid power systems with different control style, and some new problems are suggested at the end of paper.

关键词： Load flow Monte Carlo methods power system dynamics HVDC transmission Hybrid power systems Mathematical model

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Stochastic parallel algorithm based evaluation of Available Transfer Capability

Stochastic parallel algorithm based evaluation of Available ...

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International Conference on Critical Infrastructures, CRIS

In practical power markets, Available Transfer Capability (ATC) is crucial for transmission customers, system operators and power marketers to make a good choice. It is an indication of the expected transfer capability remaining on the transmission network. In order to assure the secure, economic, stable and reliable operation of power systems, the assessment of ATC should be carried out instantly. Most of the existing ATC calculation are mainly focused on AC power systems and based on deterministic techniques. As high performance computing has been extensively used in scientific computation and technology, less work has been done on evaluation of ATC by using parallel algorithm. This paper is dealing with the evaluation of ATC by stochastic parallel algorithm in an AC power system. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of power systems, several statistical indices is presented to evaluate ATC. They are calculated based on Monte Carlo simulation and parallel computing. The system operation states can be simulated by Monte Carlo method, and the parallel algorithm based on MATpower (A MATLAB™ power system Simulation Package) is developed. Case study with an IEEE 30-bus power system is used to verify the presented approach. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method can elapse shorter computation time and it is more effective and practical. Some new attractive issues are suggested at the end.

关键词： Monte Carlo methods Load flow power system dynamics Uncertainty Parallel algorithms

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Analysis of cutting-edge techniques in the high voltage and high power adjustable speed drive systems

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Science China(Technological Sciences) 2009年第2期52卷 442-449页

作者： ZHAO ZhengMing BAI Hua YUAN LiQiang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

The high voltage and high power adjustable speed drive (ASD) system is one of the most attractive fields in power electronics, and it is also a very crucial technique for energy saving and emission reduction. This paper discussed and analyzed the main cutting-edge knowledge and issues in the process of exploiting the high voltage and high power ASD system.

关键词： high voltage and high power inverter safe operation area pulse and pulse sequence

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New research advancement in electrical engineering field of China-Reviews on special issue of Science in China Series E:Technological Sciences

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Chinese Science Bulletin 2009年第8期54卷 1285-1286页

作者： MEI ShengWei MA Jin State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing 102206 China

Based on,but not limited to the research results of electrical engineering published in the special issue of Science in China Series E,June 2008,this essay gives a brief review on a wide range of state-of-art advancement in electrical engineering field of China,which includes power system modeling,analysis and control,risk assessments in power system,etc.

关键词：电气工程工程领域技术科学电力系统研究成果中国科学系统建模风险评估

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IGBT modeling for analysis of complicated multi-IGBT circuits

IGBT modeling for analysis of complicated multi-IGBT circuit...

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2009 2nd Conference on power Electronics and Intelligent Transportation system, PEITS 2009

作者： Deng, Yi Zhao, Zhengming Yuan, Liqiang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781424442461

A new IGBT (Insulated Gate Bipolar Transistor) model for simulation of eomplicated multi-IGBT cireuits is presented. Based on the gate chargc and discharge behaviors of IGBT, it piecewise models the turn-on and -off transient oflGBT, and simulates the static characteristics with curve fitting method . With the kcy features of high simulation spccd, easy parameters extraction and clear physical meaning, the model is available for various IGBTs and system level circuits. This paper describes the structure and equivalent circuit of the model in detail, implements it with the simulation tool of PSIM package, and determines the parameters of the model for an IGBT of FF300R12ME3 as an example. The accuracy of the model is verified by the comparison between the simulated and experimental results. ©2009 IEEE.

关键词： Equivalent circuits

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Dynamical simulation of laboratory Microgrid

Dynamical simulation of laboratory Microgrid

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2009 Asia-Pacific power and Energy engineering Conference, APPEEC 2009

作者： Zhao, Yishu Guo, Li Department of Electrical Engineering Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424424870

A MicroGrid can increase the reliability of energy supplies by disconnecting from the grid in the case of network faults or reduced power quality. The techniques that have been investigated to control MicroGrids in both modes are summarized as well as those proposed to maintain stability during the transitions from one mode to the other. This paper first introduces the MicroGrid planning structure in Shandong Electric power Research Institute (SEPRI) and discusses the various feasible control approaches used and presents for MicroGrid. Then, based on modeling different types of distributed generations and energy storage equipment, the SEPRI MicroGrid model was simulated with several operating modes under peer to peer control strategy. The importance of an energy storage to assist stability during transition between the operating modes is emphasized. © 2009 IEEE.

关键词： Energy storage

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Assessment Method for the Reliability of power Transformer Based on Fault-tree Analysis

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高电压技术 2009年第3期35卷 514-520页

作者： WANG You-yuan ZHOU Jing-jing CHEN Wei-gen DU Lin CHEN Ren-gang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Department of High Voltage and Insulation Engineering College of Electrical Engineering Chongqing University Chongqing 400030 China

Accurate assessment of system reliability with limited or insufficient statistical data is difficult. At present, to assess the reliability of the transformers primarily depend on the statistics data, and the result of the assessment does not accurately reflect the reliability of a transformer. Fault tree is a powerful tool for depicting the logical relationships between the faults system. However, for a sophisticated reliability system, like power transformer, fault analysis is hard or infeasible because of the complexities of the equipment configuration and its faults. This paper presents a method which overcomes the drawbacks of traditional fault-tree analysis (FTA) by using FTA based on fault probability and equivalent calculation of each failure mode. Based on the further analysis of typical failure modes and influences of power transformer, the fault-tree of transformer is set up by using FTA techniques and the assessment method for the reliability of transformer is put forward, combined with the index of the importance and the method of improved analytic hierarchy process(IAHP). The assessment examples show the method can deduct the failure modes of transformer clearly, meanwhile, find out the weaknesses in time during the operation and get better assessment results. The method is helpful for the reliability analysis of a sophisticated system.

关键词：电力变压器供电系统故障树分析失效模式

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Selection method of transformer interconnecting distributed generation and distribution networks

Selection method of transformer interconnecting distributed ...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Shouzhen Zhu Lin Geng Jinghong Zheng Xiaoyu Wang DaeHee Choi Yang Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

Recently, DG (distributed generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the grounding requirements in the distribution networks. Through theory analysis and simulation, optimal selection methods are proposed. Yg/¿-connection transformer is suitable for small resistance grounding distribution networks while ¿ /Yg and ¿ / ¿ connection transformers are fit for small current neutral grounding networks. The conclusions are useful for the DG-connected power system.

关键词： Distributed control Grounding power transformer insulation power system simulation Coils power system interconnection Distributed power generation Ferroresonance Voltage power generation

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A Novel control Strategy for DFIG Based on Magnitude and Frequency of Rotor Voltage for Wind power Generation

A Novel Control Strategy for DFIG Based on Magnitude and Fre...

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IEEE PES Asia-Pacific power and Energy engineering Conference (APPEEC)

作者： Zhong Wang Yuanzhang Sun Guojie Li Xiong Li State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China

A magnitude and frequency control (MFC) strategy has been proposed for a doubly fed induction generator (DFIG). The proposed MFC is to make the DFIG equivalent to a synchronous generator in power system. It is found that the stator active and reactive powers depend on the phase and magnitude of the internal transient electro-magnetic field (EMF). The relationship between the rotor voltage and the internal transient EMF is also described. Unlike traditional control strategies such as stator-flux-orientation vector control and FMAC, the proposed MFC method manipulates the magnitude and frequency of the rotor voltage which can simplify the control system design and improve system reliability. Thus, complex coordinate transforms, rotor position detection, and rotor currents are not required in the proposed MFC for the DFIG control system. Furthermore, the rotor speed signal is also not required in the proposed MFC, but it is needed for MPPT. Simulation results are provided to demonstrate the correctness of the control scheme.

关键词： Voltage control Rotors Wind power generation power system transients control systems Stators Frequency control Induction generators Synchronous generators Reactive power

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A Circuit Model in a Wide Frequency Range for power Transformer and Analysis of its Characteristics

A Circuit Model in a Wide Frequency Range for Power Transfor...

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IEEE PES Asia-Pacific power and Energy engineering Conference (APPEEC)

作者： Yang Yu Wang Zanji Shao Chong Department of Electrical Engineering State key Laboratory of Power System Tsinghua University Beijing China

In order to predict VFTO (very fast transient overvoltage) distributions in the windings during transformer design stage, it is important to acquire the frequency range of the surge wave that could enter the transformer winding, and then model the windings in that frequency range. In GIS (gas insulated station), transformer is connected to bus through bushing and lead wire. The bushing capacitance to ground will bypass the high frequency components, so there should be a upper limit of the frequency components of the surge wave at the entrance of the transformer. In this paper, the transformer windings are modeled using MTL (multitransmission-line) model firstly, then the lumped equivalent circuit is formulated with the -type circuits, and finally the driving-point impedance and voltage transfer functions of the equivalent circuit are calculated using nodal analysis. The driving-point impedance of a model winding is calculated and compared with the measured result, and the validation of the equivalent circuit of transformer winding in the frequency range below 20 MHz is verified. Then the driving-point impedances of two real transformer windings are calculated with the equivalent circuit. Taking the lead impedance into consideration, the impedance of the winding is compared with the one of the bushing capacitance. The results show that most of the energy of the frequency components above 10 MHz in the surge wave will pass through the bushing capacitance and will not cause damage to transformer insulations.

关键词： Frequency power transformers power transformer insulation Impedance Windings Insulators Equivalent circuits Surges Capacitance Voltage control

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