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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control"

共 605 条记录，以下是71-80 订阅

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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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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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Research on the arithmetic of non-unit voltage protection for EHV transmission line based on wavelet analysis

Research on the arithmetic of non-unit voltage protection fo...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yang, Ming-Yu Wang, Shi-Xu Mao-ying, Chen 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)0780391144

This paper presents a new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines. This scheme Is developed using wavelet analysis, in which the singularity of fault transient voltage signals in one terminal Is utilized to discriminate clearly between Internal and external faults. Lipschltz Exponent (LE) Is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500-kV EHV transmission system has been simulated by ATP to evaluate the scheme. The simulation results show that this scheme is capable of providing correct responses under various system configurations and fault conditions. © 2005 IEEE.

关键词： EHV power transmission

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Study on improvement of available transfer capability by demand side management

Study on improvement of available transfer capability by dem...

引用

3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Ming, Zhou Yajing, Gao Gengyin, Li IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9787900714138

Demmand Side Management (DSM) is now an important consideration for electric power utilities. DSM in general refers to any activity adopted by an electric utility that ultimately changes the utility's system load curve. Enhancing the DSM activities could help not only the system operate more efficiently, but also benefit the system Available Transfer Capability (ATC). This paper presents an integrated framework for evaluating impacts of DSM on ATC. A set of load management models for peak clipping/shifting and valley filling, strategic conservation and strategic load growth are presented. Composite DSM actions in the power system's diverse areas are also modeled. ATC evaluation procedure incorporated with DSM resources is given in sequential Monte Carlo simulation. The Liner-programming based ATC calculation model and time-varying load curves are employed to calculate ATC indices. The IEEE-RTS79 is used to illustrate the proposed approach and implement comparisons of impacts with and without DSM activity on ATC indices. © 2008 DRPT.

关键词： Demand side management

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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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A generalized reconstruction algorithm for electrical capacitance tomography 6

A generalized reconstruction algorithm for electrical capaci...

引用

6th World Congress in Industrial Process Tomography

作者： Lei, J. Liu, S. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing102206 China

ISBN: (纸本)9780853163220

Owing to the advantages, such as high speed, low cost, high safety, easy implementation and non-intrusive sensing, electrical capacitance tomography (ECT) is considered as a promising process tomography technology. Successful applications of ECT depend on the speed and precision of the image reconstruction algorithms. In essence, ECT image reconstruction process belongs to a typical ill-posed problem. Methods that ensure a stable numerical solution while enhancing the quality of the reconstructed images should be employed. In this paper, based on the semiparametric model, a generalized objective functional that considers the inaccuracy nature in the measured capacitance data and the model error, which has been developed using the combination estimation and a novel stabilizing functional, is created. An efficient algorithm, which integrates the beneficial advantages of the homotopy method where the homotopy equation is designed by the fixed point homotopy and solved using the fixed point iteration algorithm based on the alternate iteration scheme, the self organizing migration algorithm and the harmony search algorithm, is proposed for searching a possible global optimal solution. This algorithm is tested by the noise-free capacitance data and the noise-contaminated capacitance data, and excellent numerical performances and encouraging results are observed. Numerical simulation results reveal that the proposed algorithm is very successful in solving the ECT image reconstruction problem. In the cases considered in this paper, the reconstructed results by the proposed algorithm show salient improvement in the spatial resolution and accuracy. The spatial resolution of the reconstructed images by the proposed algorithm is enhanced, and the artifacts in the reconstructed images can be removed effectively. Furthermore, the reconstructed results under the noise-contaminated capacitance data indicate that the proposed algorithm is very competent to deal with the inaccuracy i

关键词： Capacitance

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Research on dynamic mathematic model of VSC-HVDC based on energy conservation principle

Research on dynamic mathematic model of VSC-HVDC based on en...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Li, Guangkai Li, Gengyin Zhao, Chengyong Liang, Haifeng Yin, Ming 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)0780391144

Voltage Source Converter (VSC) based HVDC (VSC-HVDC) technology is a kind of newly developed HVDC transmission technology. Based on analyzing the fundamental functions of VSC-HVDC, a dynamic mathematic model based on energy conservation principle is developed in this paper. The process of energy conversion and dynamic operation mechanism are analyzed. Theoretical analysis and the control system are validated by simulation on software PSCAD/EMTDC. © 2005 IEEE.

关键词： Energy conservation

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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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