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Development of dynamic var compensator based on 12-pulse thyristor controlled reactor

Development of dynamic var compensator based on 12-pulse thy...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Long, Yunbo Yu, Han Cui, Zhengpai Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

This paper analyzes characteristic harmonic currents of TCR and presents a method to reduce the harmonics by means of phase-shift transformer. It also introduces the constitution and implements methods of compensating device. Some key solutions for developing TCR device are introduced, such as reactive currents detection, control algorithm and the realization of controller based on ATmega128 microcomputer. Finally, the data of field test is analyzed. © 2006 IEEE.

关键词： Electric transformers

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Analysis and simulation of multi-terminal VSC-HVDC connection

Analysis and simulation of multi-terminal VSC-HVDC connectio...

引用

7th IET International Conference on Advances in power system Control, Operation and Management, APSCOM 2006

作者： Liang, Haifeng Li, Gengyin Zhou, Ming Zhao, Chengyong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0863412467

VSC-MTDC has attracted increasing attention because of its excellent characteristics. Its connection type is one of the key points in research works. Three basic connection types including Parallel, Series and Hybrid are analyzed and their characteristics are discussed in this paper. Through the analysis on VSC equations in dqO coordinate system, constant DC voltage PI controller and constant power PI controller are designed. On the basis of establishing MATLAB simulation models, the simulations of three connection types are conducted. Simulation results show that the proposed connection types of VSC-MTDC are feasible and the characteristics of them are verified.

关键词： MATLAB

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Study of electricity market stability model

Study of electricity market stability model

引用

7th IET International Conference on Advances in power system Control, Operation and Management, APSCOM 2006

作者： Lu, Zhanhui Li, Gengyin Zhou, Ming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0863412467

Combining electricity market dynamic model proposed by Alvarado, this paper uses differential/algebraic equations and eigenvalue techniques to study the stability of electricity markets. The necessary and sufficient conditions of judging electricity market stability and asymptotical stability are provided. As well as the sufficient conditions of judging electricity market unstable and asymptotical unstability is presented. The obtained conclusions removed the condition of Yang's with the assumption "the matrix is square and nonsingular" and other conditions. Using these stability conditions may directly judge the electricity market model stability by the initial data. In addition, the theoretical results in this paper can be used to reasonably explain the unable phenomena of electricity market proposed by Alvarado.

关键词： power markets

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Research on a practical approach of integrated compensation for unbalanced load

Research on a practical approach of integrated compensation ...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Cui, Zhengpai Yu, Han Li, Sheng Long, Yunbo Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

Asymmetric load is quite common in distribution network, the compensation of which is a serious problem under some situations. A novel integrated compensation method is put forward based on the principle of reactive power compensation. A practical formula of the balancing compensation for the unbalanced load is deduced by using the symmetrical component method, which is not only suitable for the threephase three-wire system but also for the three-phase four-wire system. The simulation results based on MATLAB show the validity of the compensation for the unbalanced load with different connection, and verify the correctness of theoretical deduction. © 2006 IEEE.

关键词： MATLAB

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Available transfer capability assessment considering parameters variety

Available transfer capability assessment considering paramet...

引用

7th IET International Conference on Advances in power system Control, Operation and Management, APSCOM 2006

作者： Gao, Yajin Li, Gengyi Zhou, Min Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0863412467

Available transfer capability (ATC) determines the largest transfer that can be implemented in a certain direction across the power grid without violating security constraints. The uncertainties including load level, aging and maintenance of elements and weather conditions, which have great influence on power system operation should be taking into account when calculating ATC. Considering time-varying nature and uncertainty of system parameters, the time-dependent model is adopted to describe the effects of weather conditions, aging and maintenance on element fault rates. Time-varying restoration time and load are modeled using random variables. The sequential simulation technique is applied to sample the system states, then based on linear programming and DC power flow ATC calculation is proposed. The algorithm based on MATLAB 6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： Linear programming

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Research and simulation of shunt reactors used to EHV transmission lines

Research and simulation of shunt reactors used to EHV transm...

引用

7th IET International Conference on Advances in power system Control, Operation and Management, APSCOM 2006

作者： Xu, Yuqin Zhang, Li Liu, Lihua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Qingnian road 204 Baoding China

ISBN: (纸本)0863412467

The power frequency over-voltage of EHV power transmission lines in three operating conditions, i.e., capacity effect of unloaded line, unsymmetrical faults and load shedding is analyzed. The shunt reactor's function to restrain the power frequency over-voltage is analyzed theoretically. Different compensation ratios and installment positions of shunt reactors are simulated in three operating conditions of 750 kV transmission lines through the software ATP/EMTP. From the simulation results, it is found that the shunt reactors can restrain the power frequency over-voltage in three operating condition effectively and the magnitude of the power frequency over-voltage will be lower with the compensation ratio of the shunt reactor becoming larger. In addition, when the shunt reactor is switched at the terminal of the transmission line, its effect restraining the power frequency voltage is the best compared with other two modes of connection in unloaded line with single power supply, unsymmetrical faults and load shedding. The method of operation for the shunt reactor is also discussed in this paper. Along with the expansion of the system capacity and the line's transmitted power, the method of operation that the shunt reactor is switched off from the system needs to be considered according to the power system's operation condition.

关键词： Electric lines

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Coordinated control strategy for UPQC and its verification

Coordinated control strategy for UPQC and its verification

引用

2006 IEEE power Engineering Society General Meeting, PES

作者： Peng, Li Qian, Bai Gengyin, Li IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)1424404932

This paper researches profoundly on the coordinated control of UPQC (Unified power Quality Conditioner). By analyzing the radical reasons of coupling effect between UPQC series unit and shunt unit, a simple and practical coordinated control strategy for UPQC series unit and shunt unit is proposed, i.e. by introducing corresponding voltage corrective link directly to UPQC series unit and shunt unit respectively, and by suitable mode of PWM in addition, the coupling effect between its series unit and shunt unit is eliminated fully. Therefore, the complex degree of the whole UPQC control system is simplified greatly. Combined with a power quality waveform tracking method based on H∞ control, the coordinated control between UPQC series unit and shunt unit is implemented by the proposed strategy. The experimental results indicate that the method can eliminate the steady-state phase shift and amplitude attenuation of the voltage tracking compensation of series unit and the current tracking compensation of shunt unit for UPQC. Finally, the unified power quality multi-function control of UPQC is achieved. ©2006 IEEE.

关键词： power quality

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Approach on detection of reactive and harmonic currents in single-phase circuit

Approach on detection of reactive and harmonic currents in s...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Yu, Han Cui, Zhengpai Li, Sheng Liu, Qihui Long, Yunbo Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

This paper presents an approach to the detection of harmonics and reactive currents in single-phase circuit according to the orthogonal characteristic of sine function. The method is simple and practical, which cannot only detect the current component in the distorted current but can also obtain the sum of the active and reactive current. Meanwhile, the presented method possesses fine digital filtering characteristics, and has better qualities in real-time and dynamic response characteristics in comparison with the harmonics detection through the simulated low pass filter. The MATLAB simulation studies illustrate the effectiveness of the proposed method. © 2006 IEEE.

关键词： Low pass filters

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Research on the integrated criterion for single-phase reclosure of EHV transmission lines without shunt reactors

Research on the integrated criterion for single-phase reclos...

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Liu, Haofang Wang, Zengping Xu, Yan Ma, Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0863416381

The relation between the voltage at the end of the opened phase conductor (VATEOTOPC) and the sum voltage of the two healthy phases (SVOTTHP) are analyzed. An integrated criterion based on the relation is proposed to determine the fault nature of single-phase faults. The integrated criterion is simple in scheme and can be realized easily. It can distinguish between temporary and permanent faults effectively and has good adaptability to load currents and fault distances. Simulation tests show that the conclusions in this paper are correct.

关键词： Permanent fault Temporary fault The sum voltage of the two healthy phases(SVOTTHP) The voltage at the end of the opened phase conductor(VATEOTOPC)

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Computation of power line tower lightning surge impedance using the electromagnetic field method

Computation of power line tower lightning surge impedance us...

引用

17th International Zurich Symposium on Electromagnetic Compatibility, 2006

作者： Gao, Changzheng Li, N. Li, Bing Zhao, Zhibin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Baoding Hebei 071003 China

ISBN: (纸本)3952299049

The power line tower lightning surge impedance is computed using an electromagnetic field approach. After comparing the results computed by our method and those tested with both a vertical conductor and reduced scale 4-poles model of tower, the method we used is proved to be right and more practical as the soil and the grounding system of the tower can be considered in the method. Using this method, the lightning surge impedance of the full scale UHV tower with grounding system is analyzed and the results show that the lightning surge impedance of a tower on the perfect ground has a little difference with those of an actual tower considering both its grounding system and soil resistivity, and when the soil resistivity is changed, the surge impedance changes slightly. Furthermore, a circuit model of the tower is obtained by Vector Fitting method based on the results we computed. Using the circuit model, the lightning surge performance of a power transmission line can be analyzed more accurately by EMTP or other methods.

关键词： Lightning protection

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