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检索条件"机构=Key Lab of Power System Protection and Dynamic Monitoring & Control under Ministry of Education"

共 259 条记录，以下是21-30 订阅

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Prony analysis of electrical transient characteristics of AC system during HVDC commutation failure

Prony analysis of electrical transient characteristics of AC...

引用

2010 9th International power and Energy Conference, IPEC 2010

作者： Zhang, Rulian Zhao, Chengyong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei Province China

ISBN: (纸本)9781424473991

With the development of High Voltage Direct Current (HVDC) transmission, the impact of DC system on AC relay protection becomes more prominent. So it becomes more important to research electrical characteristics of AC system under DC faults. In PSCAD/EMTDC environment, the inverter commutation failure resulted from short circuit faults in AC line is simulated based on the electromagnetic transient model of Shandong grid containing Ningdong-Shandong DC transmission system. Prony algorithm is applied to analyze the electrical transient characteristics of AC system during commutation failure. The coincidence of fitted waveform and simulated waveform verified the validity of prony algorithm. Prony analysis results show that DC system injects a large number of inter-harmonic components into the inverter side AC system during commutation failure, and the distortion of the parallel line current is more serious than that of the fault line current, so the impact of DC system on the AC relay protection devices equipped on the parallel line is greater. ©2010 IEEE.

关键词： Relay protection

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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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Study on sequence component based fault phase selector during power swings

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

引用

International Conference on Critical Infrastructure

作者： Li, Wei Bi, Tian-Shu Yang, Qi-Xun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Changping District Beijing 102206 China

ISBN: (纸本)9781424480814

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. © 2010 IEEE.

关键词： Electric relays

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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 new load model suitable for transient stability analysis with large voltage disturbances

A new load model suitable for transient stability analysis w...

引用

作者： Zheng, Xiao-Yu He, Ren-Mu Ma, Jin 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)9788986510119

Load model has great impacts on the power system simulation results, while in transient stability analysis the traditional load models have some disadvantages which can't describe the load shedding characteristic when low voltage disturbances happened. Thus, a new load model is proposed in this paper after the investigation of the field measurement data and the load characteristics of some equipment under low voltage. Several new parameters describing the load shedding characteristic are provided in the new load model which can be derived by identifying the field data. With these new parameters, the load difference caused by the load shedding during the low voltage disturbances can be well illustrated. The improved load model has larger application ranges and better properties in describing the nature of the load dynamic behaviors during the transient stability analysis which also improves the reliability of the simulation. The field measurement data illustrate its efficiency.

关键词： Transient analysis

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Study and simulation of VSC-HVDC under AC power system faults

Study and simulation of VSC-HVDC under AC power system fault...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Yue, Wei Zhao, Chengyong Lu, Yi Li, Gang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Zhejiang Electric Power Test and Research Institute Xiacheng District Hangzhou 310014 China

ISBN: (纸本)9781424480814

In this paper, control strategies of VSC-HVDC aiming to improve the ability of fault ride through of the VSCHVDC system under serious asymmetric fault at the receiving side was studied. On the basis of DQ decoupling control scheme, two additional fault control modules are proposed based on positive and negative sequence detecting technology. One is based on negative sequence voltage compensation, and the other is based on oscillating active power elimination. Simulations are carried out in PSCAD/EMTDC to verify the validity of the proposed control strategies. © 2010 IEEE.

关键词： HVDC power transmission

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Multi-objective Voltage Quality Disturbance Generator with Cascade H-bridges

Multi-objective Voltage Quality Disturbance Generator with C...

引用

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

作者： Renzhong Shan Xiangning Xiao Zhongdong Yin Qiao Liu Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel main circuit topology of voltage quality disturbance generator is proposed in this paper, composed of PWM rectifier and cascade H bridge inverter. The three phase inverter is decoupling controlled. The main advantage of the topology is a hybrid structure, the mainly power of voltage quality disturbance generator is supplied by system source and the small power is supplied by inverter, so the capacitor generator is easy to realize larger because of lower active loss. PWM rectifier is adopted to maintain the dc-bus voltage stably, the later inverter is composed of cascade H-bridges. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the problems of voltage fluctuation and flicker, sag and harmonic is researched by theoretical analysis and simulation. Finally, the simulation and experimental results show that the proposed main circuit topology and control strategy is feasible and efficient.

关键词： Pulse width modulation inverters Circuit topology Circuit simulation Rectifiers power generation Hybrid power systems Analytical models Voltage fluctuations Bridge circuits power supplies

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Simulation and Test Study on Module Based controllable Shunt Reactor

Simulation and Test Study on Module Based Controllable Shunt...

引用

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

作者： Ke Li Zhongdong Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This paper puts forward a TCR module based new type shunt high voltage reactor, which consists many small capacity thyristor controlled reactor modules and via three-windings transformer connecting to system. The secondary windings of transformer adopt duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is limited remarkably. A 500 kvar/10 kV industrial prototype was developed, and digital simulation based on EMTDC/PSCAD and field test were carried out to verify the characteristics of topology proposed.

关键词： Testing Shunt (electrical) Inductors Topology power system harmonics PSCAD Thyristors Voltage control control systems Joining processes

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Calculation and analysis of capacity credit of wind farms based on Monte-Carlo simulation

Calculation and analysis of capacity credit of wind farms ba...

引用

IEEE General Meeting power& Energy Society

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

How to compare the wind power generation and traditional power generation in aspect of capacity is essential of power system expansion. The capacity credit is a convenient and effective way to compare these two different types of power generation. Unfortunately, the definition of capacity credit of wind farms is not clear and generally acknowledged. In this paper, a more clear definition of wind farms' capacity credit based on well-known concept of effective load carrying capability (ELCC) is presented. As well as a calculation method of wind farms' capacity credit based on non-sequential Monte-Carlo simulation, this method considered the failure of transmission lines. The secant method is used at capacity credit calculation process, and the modified direct current optimal power flow method is adopted in power flow calculation. Several different influence factors of capacity credit of wind farms such as the cut-in, cut-out and rated wind speed and the rated capacity of the wind turbine generator, transmission capacity of transmission lines and different integration solutions are analyzed in IEEE-RTS79 case studies.

关键词： Wind farms Reliability power system reliability power generation power transmission lines Monte Carlo methods

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Wind power price regulation considering wind power fluctuation

Wind power price regulation considering wind power fluctuati...

引用

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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