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Study on the coordinated control strategy of wind farm and VSC-HVDC

Study on the coordinated control strategy of wind farm and V...

引用

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

作者： Yang, Xiaolian Zhou, Min Li, Guangka Li, Gengyi Zhao, Chengyon 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

Offshore wind farms based on doubly fed induction generator (DFIG) are generally connected to the AC system via long submarine cables. Integration of offshore wind farms with HVDC transmission based on voltage source converter (VSC-HVDC) is an advantage due to its regulating properties. This paper analyzes the need for coordinating the control of DFIG and VSC-HVDC link so that the two topologies can work together. Stator flux oriented vector control technology is used to execute AC excitation for DFIG rotor, then independent control of active and reactive power is realized and electricity generation by capturing maximal wind energy with high efficiency is also obtained. The control objective of VSC-HVDC is delivering the generated power to the AC network instantaneously and to keep AC voltage at wind farm bus constant. Interactions between DFIG and HVDC link are investigated and simulations performed in PSCAD/EMTDC to verify the proposed control strategy.

关键词： Offshore wind farms

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Fuzzy excitation control based on wide-area measurements

Fuzzy excitation control based on wide-area measurements

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

作者： Liu, Xingjie Mi, Zengqiang Zhao, Hongshan Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)0863412467

In this paper, a fuzzy excitation controller based on wide-are measurement system (WAMS) is built, in which the voltage deviation and its rate are introduced as the input of main-controller, while the deviation and corresponding rate of local generator's frequency and center-of-inertia frequency are acted as the input of the second controller to indicate the global information. The multi-machines system model is firstly set up with MATLAB/PST. Then the digital simulation is conducted to compare the influences of PID excitation controller and fuzzy excitation controller based on WAMS on the transient stability. Results show that applying the fuzzy excitation controller proposed in this paper, the ability to endure serious disturbances can be strengthened and transient stability can be improved.

关键词： controllers

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Voltage waveform deadbeat control of DVR

Voltage waveform deadbeat control of DVR

引用

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

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

ISBN: (纸本)0863412467

Because the compensation signals of DVR are unpredictable, this paper advanced a deadbeat control algorithm for DVR voltage waveform tracking compensation. On the basis of state equations and state variables information of the system, a specific scheme is produced to realize voltage waveform tracking compensation, which includes a state observer a voltage forecast and a current forecast for a random load. The switch control signals of next sampling period are calculated so that the output voltage can track the reference voltage synchronously. The simulation results show that this control algorithm is correct and feasible.

关键词： Equations of state

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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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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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Study of electricity market stability model

Study of electricity market stability model

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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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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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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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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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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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