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

共 542 条记录，以下是41-50 订阅

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The study of complex torque coefficient approach's realization based on PSCAD/EMTDC

The study of complex torque coefficient approach's realizati...

引用

International Conference on Critical Infrastructure

作者： Wang, Jin Guo, Chunlin Xiao, Xiangning Zheng, Rui Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University China

ISBN: (纸本)9781424480814

The method, complex torque coefficient approach, which is used to analyze the sub synchronous oscillation (SSO) problems with the help of PSCAD/EMTDC are recommended. While how to achieve the complex torque coefficient approach by time-domain simulation method effectively has not been specified. With the simulation study of different systems like HVDC system, AC system with series compensation device, etc, amplitude, injection time and additivity of injected oscillating torques are discussed. A set of conclusion to the method is drawn for reference. © 2010 IEEE.

关键词： HVDC power transmission

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Research of analysis method of power system real-time digital simulation error

Research of analysis method of power system real-time digita...

引用

International Conference on Critical Infrastructure

作者： Wang, Xiangxu Guo, Chunlin Xiao, Xiangning Zhao, Chengyong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University China

ISBN: (纸本)9781424480814

Simulation accuracy has great effects on power system analysis and control. In this paper, in order to analyze the power system real-time digital simulation error, prony algorithm is used to extract the features of signal. Based on the analysis results of this algorithm, residual similar index was used to characterize the global error of simulation, and then frequency, damping and amplitude similar indexes were employed to represent features error of transient signals respectively. A calculation program for power system real-time digital simulation accuracy evaluation was employed to analyze the measured waveforms and results of fault simulations on RTDS. Simulation results have proved the validity of the proposed analysis method of power system real time digital simulation error. © 2010 IEEE.

关键词： Errors

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Auxiliary frequency control of HVDC systems for wind power integration

Auxiliary frequency control of HVDC systems for wind power i...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Hu, Jing Zhao, Chengyong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424480814

As a promising renewable resource, wind power is highly expected to contribute a significant part of generation in power systems in the future, but this also brings new integration related power quality issues due to its unconventional characteristics. To solve frequency fluctuating problems of wind power integration, this paper proposes an idea that it is possible and reasonable to use HVDC lines with auxiliary frequency control(AFC) to stabilize the frequency fluctuation caused by wind power, which could increase the rate of wind power integration not only, but also reduce intra-region reserve capacity and wind power cost. Furthermore, an improved frequency control strategy of HVDC is proposed. The simulation results show that the substitution of wind power frequency control reserves with the HVDC connection is possible without additional equipment and without causing large disturbances in both sides. © 2010 IEEE.

关键词： Wind power

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Electromagnetic and electromechanical transient hybrid real-time simulation technology based on RTDS used in subsynchronous resonance research

Electromagnetic and electromechanical transient hybrid real-...

引用

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Li, Wei Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424459407

In this paper, power system electromagnetic and electromechanical transient hybrid real-time simulation technology is expounded in details, which has advantages of the electromagnetic transient simulation program and electromechanical one. The more details needed to analyze the dynamic characteristics of power systems are provided by this hybrid simulation technology, and the scale of power system simulated is not limited in the hybrid simulation program. The hybrid simulation program is applied to analyze the power system subsynchronous oscillation problem occurred in a power plant with 4 turbine generators located in the northwestern China. According to the simulation results, it is clear that the stability of generators is threatened by the subsynchronous oscillations caused by capacitor series compensation in the transmission line connecting the power plant and the load center system. In meantime, the effectiveness of the countermeasure is validated simultaneously by the hybrid simulation results. ©2010 IEEE.

关键词： Electromagnetic simulation

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Research on Submodule Capacitance Voltage Balancing of MMC Based on Carrier Phase Shifted SPWM Technique

Research on Submodule Capacitance Voltage Balancing of MMC B...

引用

2010年中国国际供电会议(CICED 2010)

作者： Xin Zhao Chengyong Zhao Guangkai Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry

ISBN: (纸本)9781457700668

Modular multilevel converter (MMC) is a new multilevel converter suitable for VSC-HVDC. The principle of the submodules and converter topology are introduced in this paper. A novel carried phase shifted sinusoidal pulse width modulation (CPS-SPWM) scheme suitable for MMC in VSC-HVDC is presented. Voltage balancing among the submodules is a crucial problem of MMC. Based on the energy equipartition and voltage balance,a capacitor voltage-balancing strategy is presented in this paper with the topology of MMC and modulation. This scheme could effectively ensure each submodule at the same capacitor voltage level. The correctness and effectiveness of the schemes were verified by the simulation.

关键词： modular multilevel converter high voltage direct current transmission carrier phase-shifted sinusoidal pulse width modulation technique circulating current capacitance voltage balancing

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A methodology for vulnerability assessment of backup protection under cascading failures

A methodology for vulnerability assessment of backup protect...

引用

International Conference on Critical Infrastructure

作者： Yang, W.H. Bi, T.S. Huang, S.F. Xue, A.C. Yang, Q.X. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)9781424480814

To avoid undesired operation of backup protection caused by load encroachment under cascading failures, the methodology for vulnerability assessment of backup protection is studied. In this paper, the vulnerability assessment of backup protections is formulated as a mixed integer nonlinear programming problem, which is solved by the binary particle swarm optimization approach. The measurement index for assessing the vulnerability of backup protection is given as well. The simulation results on New England 39-bus system demonstrate that the proposed method can effectively assess the vulnerability of backup protection under cascading failures. © 2010 IEEE.

关键词： Particle swarm optimization (PSO)

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A novel method for determining minimum break point set based on network reduction and relays incidence matrix

A novel method for determining minimum break point set based...

引用

International Conference on Critical Infrastructure

作者： Ye, Donghua Ma, Jing Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424480814

This paper presents a simple and effective approach based on two dynamic matrixes of node-relay matrix (NRM) and relay-incidence matrix (RIM) to determine minimum break point set (MBPS) for coordination of the directional relays. Firstly, the NRM and RIM are defined and their calculation methods are developed. Then, some optimization operations for network reduction and special structure are presented to update the NRM and RIM and the detailed flowchart is provided. At last, case studies on various topologies demonstrate the effectiveness and simplicity of the proposed method. © 2010 IEEE.

关键词： Geometry

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Available transfer capability assessment of AC/DC transmission system

Available transfer capability assessment of AC/DC transmissi...

引用

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Gao, Yajing Yang, Jin Zhou, Ming Li, Gengyin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 071003 Baoding China

ISBN: (纸本)9781424459407

With the increasing expansion of AC/DC transmission system scale, the research on Available Transfer Capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. Most of the existing ATC calculation methods are mainly based on deterministic techniques and suitable for AC transmission system. In practical power systems, there are large amount of uncertainties which can effect the operation of AC/DC transmission system, and power system is dynamic and time-varying. A novel approach is proposed to analyze relevant features of ATC and calculate ATC based on sequential Monte Carlo-Frequency and Duration (FD) considering uncertainties and time variation of AC/DC transmission systems. The algorithm MATLAB6.5 is developed. Modified IEEE-14 node test system is used to verity the presented approach. ©2010 IEEE.

关键词： Uncertainty analysis

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New algorithm of topology analysis based on PMU information 1

New algorithm of topology analysis based on PMU information ...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Qian, Cheng Wang, Zengping Zhang, Jinfang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)9781424480814

With the widely installation of Phasor Measurement Units (PMUs) in power system and the increasing requirement of the real-time monitoring and control, a novel power system topology analysis algorithm is proposed with high precise information from PMUs to improve the performance of current network topology analysis. First of all, a method of identifying switch status is established to correct the state mistake of circuit breakers (CB) relying on the analog data acquired by PMUs. Subsequently, a topology analysis in substation combined with the PMUs information (including the digital data of CBs state and the phasor of voltage and current) is advanced in this paper. And then an efficient topology analysis algorithm introduces into topology search process using Cotree-to-Bus structure array. Finally, simulation results based on the PSCAD and MATLAB software have validated the efficiency and accuracy of the novel method introduced in this paper. © 2010 IEEE.

关键词： MATLAB

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A new substation configuration algorithm based on the graphic characteristic of the main electrical connection

A new substation configuration algorithm based on the graphi...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Zhang, Jinfang Wang, Zengping Zhang, Yagang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)9781424480814

In order to overcome some disadvantages of the conventional adjacent matrix method, the relationship between the elements of the adjacent matrix and the connected routes among nodes is analyzed as the fundamental introduction. Subsequently, the graphic characteristic of the main electrical connection in power plant or substation is extracted as three types: single branch, two branches in-parallel and multibranches in-parallel, and an unified principle for the formulation of connected routes among arbitrary two nodes in wiring connection is also proposed as the cornerstone for the novel method. Thirdly, a novel method of substation configuration is established based on the set of connected routes among arbitrary two nodes, and by mean of taking the route state as variables, the value of connected routes set is used to directly determine the element in corresponding place of the adjacent matrix. Finally, the example results show that the new method is able to finish the original topology analysis and track the state status of switches more accurately and rapidly. © 2010 IEEE.

关键词： Electric connectors

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