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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 531 条记录，以下是81-90 订阅

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Subsynchronous oscillations study of non-parallel operating AC/DC system with series capacitor

Subsynchronous oscillations study of non-parallel operating ...

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作者： Zheng, Rui Xiao, Xiangning Jin, Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781457700668

The first non-parallel operating AC/DC system with series capacitor being constructed in China is hybrid of the Hulunbeier-Liaoning ±500kV HVDC lines and Yimin-Fengtun 500kV AC transmission system. Its subsynchronous oscillation problem become complex because of the mutual effect of series capacitor compensation and HVDC. In order to analyze the SSO characteristic of this new grid structure, six cases derived from original system have been adopted: the islanded operating HVDC(Hulunbeier-Liaoning) system, the AC(Yimin-Fengtun) system without series capacitor and HVDC lines, the AC system with FSC and HVDC lines, the AC system with FSC+TCSC(two control strategy) and HVDC lines. Through the simulation of shaft torque and rotational speed of studied generators with multimass in different faults situations, the results show that the non-parallel operating AC/DC system can mitigate SSO caused by HVDC or FSC. The system characteristic is in association with the system structure, compensation type and control strategy of TCSC. © 2010 Chinese Soc for Elec Eng.

关键词： Electric utilities

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A Novel Wide-area Fault Location Algorithm Based on Fault Model

A Novel Wide-area Fault Location Algorithm Based on Fault Mo...

引用

IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Jing Ma Jin-long Li Zeng-ping Wang Qi-xun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel wide-area fault location algorithm is proposed in this paper. Fault model is developed in super-imposed network, and then based on network correlation coefficient matrix (NCCM), location function is defined. Finally search technique with adaptive step is used to locate fault branch and fault distance. This method requires few PMUs, avoids modifying node admittance matrix and NCCM. It has less calculation burden, and is easy to achieve. Simulation results based-on PSCAD show that the algorithm can locate fault branch accurately and fault distance precisely in condition of limited measurement points. And fault location results are not affected by fault type or fault resistance.

关键词： Fault location power system modeling Phasor measurement units Transmission line matrix methods power system simulation PSCAD power system reliability power system faults power transmission lines Voltage

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Wind power price regulation considering wind power fluctuation

Wind power price regulation considering wind power fluctuati...

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International Conference on Critical Infrastructures, CRIS

作者： Yuhong Zhang Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

Wind power penetration to power systems is increasing rapidly in the recent years due to its environmental benefit, while wind power fluctuation also brings some problems to power system operation which impacts the transmission company's willingness to accept wind power. The most serious conflict influencing wind power development is that the currently adopted price of wind power on-grid does not take this fluctuation or the impact on the system operation into account. Currently, quotas and enforcing access is broadly used in wind power regulation. It is now required that all wind power output should be accepted by the grid, and is rewarded with a guided rate. But with the increase of wind power penetration to power grid, a more effective price regulation to wind power should be set up with wind output uncertainty into account. This paper takes wind farms in different areas in China as the research objects and uses accounting cost analysis approach to calculate wind power costs, which enables the wind farms in different areas to get the same rate of return on investment as that of thermal power plants. These tariffs will be derived as a basic price for the reference by the power grid then. The basic wind power prices are multiplied by a penalty factor which is an innovative as the final prices paid to the wind farms. The penalty factor is related to the accuracy of wind power output. If the accuracy of the wind farm output is higher than that of the regional average one, the penalty factor will be greater than one, so that the really paid wind power price is higher than the base value and the income of the wind farm will be increased, otherwise the earnings will be reduced. To illustrate the problem, an example is given. The use of this penalty factor will eventually help stimulate wind farms to improve the accuracy of wind power output, and improve the stable operation of the systems with large wind power penetration, and promote the sustainable development of wind

关键词： Fluctuations

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New Principle of Single-Ended Fault Location Base on Verification for Transmission lines

New Principle of Single-Ended Fault Location Base on Verific...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Jiangtao Yu Yanjun Jiao Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

A new principle of single-ended fault location is presented. It is proposed to carry out the correct fault distance by comparing the reverse traveling waves break time at the fault point, after transition resistance is calculated approximately. Distortionless model is employed to deduce the single-ended electric quantities to the verification point. The judging criterion for fault point verification and algorithm for the transition resistance calculation are introduced in detail, after reviewing the relationship between fault branch currents and fault current traveling waves. In this paper, the traveling wave propagation velocity and load current affect the calculation accuracy, will not affect the result of fault location. The simulation and calculation results by ATP and MATLAB confirm sensitivity and reliability of the principle.

关键词： Fault location Transmission lines Electric resistance power transmission lines Mathematical model Accuracy Transmission line matrix methods power system transients Voltage Laboratories

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Study on sequence component based fault phase selector during power swings

Study on sequence component based fault phase selector durin...

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International Conference on Critical Infrastructures, CRIS

作者： Wei Li Tian-shu Bi Qi-xun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

For digital distance relays, in order to get the correct measuring impedance, phase selector is widely used to identify the fault phases first. However, when a fault occurs at the line during power system swings, the traditional sequence component based phase selector might not identify the fault phase correctly, which leads to mal-operation of distance relays. Therefore, how to improve the existing sequence component based phase selector, especially at the condition of power system swings, is crucial. The relationship between the relative phase and amplitude of the sequence component of various asymmetric faults is analyzed. An improved asymmetric fault phase selector during power swings is proposed according to the corresponding relationship between the zero, negative sequence current components and the asymmetric fault types. The simulation results have shown the effectiveness of the method under power swings. Combining with fault component phase selector in no power swing, this method can perfectly solve the phase selection problem of transmission lines.

关键词： Grounding

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A New Algorithm of Topology Analysis Based on PMU information

A New Algorithm of Topology Analysis Based on PMU informatio...

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International Conference on Critical Infrastructures, CRIS

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

ISBN: (纸本)9781424480807

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.

关键词： Switches Network topology Topology Algorithm design and analysis Phasor measurement units Arrays power systems

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A methodology for vulnerability assessment of backup protection under cascading failures

A methodology for vulnerability assessment of backup protect...

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International Conference on Critical Infrastructures, CRIS

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

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.

关键词： power system protection power system faults Indexes Simulation Particle swarm optimization Load flow

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A novel SSR-damping scheme based on a single-phase SSSC

A novel SSR-damping scheme based on a single-phase SSSC

引用

International Conference on power Electronic Drives and Energy systems for Industrial Growth

作者： Xiangning Xiao Benfeng Gao Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring And Control under Ministry of Education North China Electric Power University Beijing China

A three-phase unbalanced system will reduce mechanical and electrical energy interaction and thus, to some extent, inhibit subsynchronous resonance (SSR). Based on this principle, a compensation method using a single-phase static synchronous series compensator (SSSC) is proposed. In this method, only one phase employs an SSSC to replace part of the fixed series capacitor, while the other two phases have fixed series compensation (FSC). By controlling the SSSC, the three-phase reactance at power frequency is balanced, while at sub-synchronous frequencies, the system is unbalanced and thus inhibits SSO. A single-phase SSSC model based on a cascaded H bridge topology is built for time-domain simulations. The damping effect and the minimum degree of compensation required from the SSSC are analyzed by transient simulations. Simulation results show the method can effectively restrain SSO and has little effect on the three-phase voltage unbalance factor. Compared with employing SSSC in all three phases, this method is more economical.

关键词： Damping power capacitors Torque Generators Capacitance Time domain analysis

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Impact of transient response of instrument transformers on phasor measurements

Impact of transient response of instrument transformers on p...

引用

IEEE General Meeting power& Energy Society

作者： Tianshu Bi Hao Liu Xing Zhou Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control under Ministry of Education North China Electric Power University Beijing China

The instrument transformer is the necessary equipment which connects the primary power system and PMU. Therefore, the measurement accuracy of PMU is directly affected by the transfer accuracy and the transient response of instrument transformer. In this paper, the dynamic signal models are abstracted from the phenomena of practical power systems. under such kinds of dynamic signal models, the impact of instrument transformer on PMU is analyzed in detail, especially for the saturation problem of the current transformer and the ferromagnetic resonance and transient response of capacitor voltage transformer. Based on the analysis, the suggestions for the evaluation criteria of PMU dynamic behavior can be provided. Moreover, the principles of choosing instrument transformers in the wide-area measurement systems are suggested as well.

关键词： power system dynamics Frequency modulation Phasor measurement units Oscillators Circuit faults Current transformers

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Parameters optimization of HVDC control system based on Simplex Algorithm in RTDS

Parameters optimization of HVDC control system based on Simp...

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International Conference on Critical Infrastructures, CRIS

作者： Zhuo Jia Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

The performance of HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of HVDC system are very few up to now. And when the optimization task comes to RTDS, it becomes more complex. This paper introduces the Simplex Algorithm and its application in real time simulation (RTDS). The system objective functions are adopted to optimize the PI parameters of constant current (CC) control at the rectifier and the extinction-angle control at the inverter for Three Gorges-Shanghai ±500 kV DC Transmission Project on the basis of the control strategy. After the optimization process was finished, the performance of the PI controller with the optimized parameters was compared with that of the PI controller with the initial parameters. The step responses of those two PI controllers were presented by figures. And it shows that the controller with the optimized parameters has strong robustness.

关键词： HVDC transmission Optimization Rectifiers Inverters control systems Voltage control Robustness

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