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World Congress on Intelligent control and Automation (WCICA)

作者： Zhaoxia Xiao Hongwei Fang School of Electrical Engineering and Automation Tianjin Professional University Tianjin China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

Transient stability of a MicroGrid in which the micro sources using the peer-to-peer and master-slave control was investigated. The P-f and Q-V droop control was used for micro sources 1 and 2. And the PQ control was used for micro source 3. The impacts of motor load on the transient stability of the MicroGrid were shown when the motor load starts, load power changes and a three-phase faults happens. And the power sharing between each micro sources and the main frequency supporting are achieved. simulation results have verified the effectiveness of the proposed control strategy.

关键词： Stability analysis power system stability Transient analysis Automation Inverters Distributed power generation

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A Pi-based control scheme for primary cascaded H-bridge rectifier in transformerless traction converters

A Pi-based control scheme for primary cascaded H-bridge rect...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Tao Xinghua Li Yongdong Sun Min Department of Electrical Engineering Naval University of Engineering China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University China

Cascaded H-Bridge rectifier (CHBR) is a more attractive solution in traction application for its transformerless structure. Because of the currents of different cells are exactly the same one, it is a challenge job to regulate the voltages of cells with only one current controller. In this paper, a PI-based control scheme is presented to deal with the voltages balance issue in CHBR. To satisfy the demand of rectifier such as unity power factor and regulated output DC voltages, the proposed control scheme consists of two parts. One is for shaping the grid current waveform and regulating the sum of DC-link voltages of all the cells; the other one is for balancing DC-link voltages. The latter is more concerned in this paper and is discussed in detail especially. simulations and experiments are carried on. The results verified the feasibility and effectiveness of the proposed scheme.

关键词： Rectifiers Voltage control Voltage measurement Converters Pulse width modulation Mathematical model

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State of the art of hybrid excitation permanent magnet synchronous machines

State of the art of hybrid excitation permanent magnet synch...

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作者： Wang, Shanming Xia, Yonghong Wang, Xiangheng Su, Pengsheng Huang, Shaogang Zhang, Anming State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Department of Electrical and Automatic Engineering Nanchang University Nanchang Jiangxi 330031 China Military Deputy Department Dalian 426 Factory No.1 Yanhai Jie Xigang Qu Dalian Liaoning 116005 China

ISBN: (纸本)9788986510119

The hybrid excitation permanent magnet machine (HEPMM) combines two kinds of excitation: permanent magnet (PM) and electrical excitation, so it possesses the advantages of PM machines and overcomes the incapability of regulating the excitation field. By now many HEPMM schemes have been presented. In this paper the operation principle, structure, advantages and disadvantages of these HEPMMs have been reviewed and compared in detail. These HEPMMs are classified into three types by new classification method - placement of PM and iron poles. At last novel harmonic excitation HEPMM is proposed and discussed.

关键词： Permanent magnets

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State of the art of hybrid excitation permanent magnet synchronous machines

State of the art of hybrid excitation permanent magnet synch...

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2010 International Conference on Electrical Machines and systems, ICEMS2010

关键词： Iron Magnetic fields Windings Stator cores Rotors Stator windings Magnetic circuits

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Double-circuit transmission line based on interconnection of sequence networks

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Dianli Xitong Zidonghua/Automation of Electric power systems 2010年第9期34卷 53-58页

作者： Li, Botong Li, Yongli Li, Hongbo Su, Bin Li, Youyi Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Research Ltd. Beijing 100016 China

For short circuit fault analysis on double-circuit transmission line, a method based on three sequences is put forward. Combining with the boundary conditions of fault, a new approach for calculating the faulty electric quantities is presented, and the interconnections of sequence networks of typical fault types are given. Because it keeps the independence of the two lines, it can serve as a basic theoretical approach for studying the process of fault inception, tripping and reclosing on double-circuit transmission lines with some special line construction modes such as different line parameters or voltage classes of the two circuits on the same tower. ©2010 State Grid Electric power Research Institute Press.

关键词： Boundary conditions

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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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Chaos Analysis of Discharge Current Based on Tracking Test of Phenolic Resin

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Transactions of Tianjin University 2009年第1期15卷 1-6页

作者：杜伯学郑晓磊董典帅 Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Henan Electric Power Survey and Design Institute State Grid Jiangsu Wuxi Power Supply Company

In tracking test, discharge is a complicated process and comparative tracking index (CTI) has wide varia-tion. To evaluate tracking resistance, the chaos analysis of discharge current is presented based on the tracking test of phenolic resin in accordance with IEC60112. According to the characteristics of statistical self-similarity and complexity of discharge current, the largest Lyapunov exponent is calculated, and the 2-dimensional attractor of discharge current is reconstructed. Moreover, the attractors of discharge current and recurrence plots of different discharge states are reconstructed. The results indicate that the chaos attractors have different characteristics in evo-lutionary tracks, the topological structure and grain direction of recurrence plots show significant differences. The chaos attractor can describe the tracking process, the recurrence plot can identify the tracking state clearly, while its arithmetic is simple.

关键词： phenolic resin tracking failure chaos theory chaos attractor recurrence plot

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Management method of the balance account based on incentive compatible theory

Management method of the balance account based on incentive ...

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1st International Conference on Sustainable power Generation and Supply, SUPERGEN '09

作者： Jikeng, Lin Xudong, Wang Tie, Bao Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424449347

In the unilateral open electricity market in China, the balance account is created as "regulator" between the bidding price of generation and retail price of electricity. Currently, the management of the balance account has serious defects. This might lead to the huge deficit and endanger the operation of market. Based on the incentive compatible principle, we propose a new method to manage the balance account through reward-penalty in the paper. The optimal bidding strategy for the power suppliers considering the new management method is also provided. The test results indicate that the proposed bidding strategy can mitigate the market power of the generation, reduce the market clearing price significantly, keep the fund of the balance account fluctuating within a certain range and further ensure the stability and sustainability of power market operation.

关键词： power markets

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Asynchronous parallel simulation of transient stability based on equivalence

Asynchronous parallel simulation of transient stability base...

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1st International Conference on Sustainable power Generation and Supply, SUPERGEN '09

作者： Jikeng, Lin Xudong, Wang Xinyu, Tong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424449347

An asynchronous parallel method based on equivalence is proposed for transient stability simulation of power system. In the method, the system is partitioned into several interconnected subsystems by geographical location, and the subsystems are equivalent each other at each integration step. Each subsystem utilizes equivalent information from other subsystems to calculate independently. At each integration step, a subsystem only needs the predictive equivalence and correctional equivalence once. Additionally, asynchronous parallel technology based on the MPI on the PC-Cluster platform is designed to speed up the convergence. Several cases demonstrate that the proposed method has fast calculation speed and efficiency, as well as the simulation precision accepted for engineering application. For some large scale real system, the real-time or even super-real-time simulation will be realized.

关键词： Transients

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simulation of three-phase four-wire shunt active power filter

Simulation of three-phase four-wire shunt active power filte...

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

作者： Wang, Jidong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424424870

With the proliferation of nonlinear loads as power electronics equipment, the disadvantage of harmonic is more and more, which influence quality of power grid. Active power filter (APF) is a new harmonic restraint method comparing with passive filter, which is a power electronics device. This paper inspects harmonic current based on three-phase circuit instantaneous reactive power theory and simulates a three-phase four-wire shunt active power filter. The simulation results validate parameter is reasonable. The outcome indicates that active power filter can suppress harmonic and neutral wire current and balance three-phase current effectivelY. © 2009 IEEE.

关键词： Wire

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