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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security"

共 617 条记录，以下是421-430 订阅

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Numerical calculation of grounding current through Capacitive Voltage Transformer due to substation switching operation

Numerical calculation of grounding current through Capacitiv...

引用

2006 IEEE International Symposium on Electromagnetic Compatibility, EMC 2006

作者： Lei, Liu Xiang, Cui Lei, Qi Lin, Li Changzheng, Gao IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring Control Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)142440293X

The constituent of Capacitive Voltage Transformer (CVT) are almost capacitances in primary side, and they act essentially as a short circuit to the transient current produced by a switching operation, which will generate high grounding current. Because capacitance is lumped parameter, so this paper use Finite-Difference Time Domain method (FDTD) to build calculation formula of Multi-Conductor Transmission Lines (MTL) whose branch points has lumped parameter network. Based on the formula, the grounding current through CVT produced by substation switching operation has been calculated. The calculation results of this paper are anastomotic with the simulation based on EMTP. It has certain consult meaning for the research of substation electromagnetic interference (EMI) on primary and secondary equipments. © 2006 IEEE.

关键词： Electric grounding

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Overvoltage analysis of long AC transmission line connected with VSC in power system restoration

Overvoltage analysis of long AC transmission line connected ...

引用

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

作者： Li, Guangkai Li, Gengyin Liang, Haifeng Zhao, Chengyong Yin, Ming 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)0863412467

Overvoltage in power system restoration must be verified. The basic principle of VSC-HVDC (voltage source converter based high voltage direct current transmission) is briefly introduced. VSC-HVDC has such characteristics as flexible operation and control modes, independent control of active and reactive power, and operation on four quadrants. The overvoltage of the overvoltage between AC transmission line and the line connected with VSC-HVDC are calculated by theory analysis and simulation on PSCAD/EMTDC. The comparison of those overvoltage shows that the overvoltage of long AC transmission line connected with VSC-HVDC is lower than that of pure AC transmission lines. So the application of VSC-HVDC can enhance the speed of power grid restoration.

关键词： Restoration

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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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The perturbed trajectories prediction method based on wide area measurement system

The perturbed trajectories prediction method based on wide a...

引用

IEEE/PES Transmission and Distribution Conference and Exposition

作者： Song, F. F. Bi, T. S. Li, H. Y. Yang, Q. K. Liu, Y. IEEE China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China Beijing Power Company Beijing China

ISBN: (纸本)9780780391932

In this paper, a novel method for perturbed trajectory prediction of post-fault rotor angle is presented based on PMU (phasor measurement unit) measurements and trigonometric function curve fitting technique. A mathematical model about the relationship of post-fault rotor angle and time is derived from a speed-governing system model, which reveals that the perturbed trajectory of the post-fault rotor angle can be expressed by trigonometric functions. By curve fitting technique, a least square method to predict the perturbed trajectory using trigonometric function is proposed. Numerical simulations are conducted on IIEEE 9-bus system to test the effectiveness of this method. The proposed method can give more reasonable and more promising prediction results as compared with polynomial curve fitting technique.

关键词： trajectory predictions rotor angle wide area measurement rolling time window least square method

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Fuzzy excitation control based on wide-area measurements

Fuzzy excitation control based on wide-area measurements

引用

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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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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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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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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