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

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The theoretical analysis and compensating experiment of voltage fluctuation

The theoretical analysis and compensating experiment of volt...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Chengxin Dai Zhongdong Yin Qiu Hong Shuhong Kong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

This paper researches the intrinsic relationship between inter-harmonics and typical voltage fluctuations of which the enveloping line is sine wave, it analyses the effects to voltage fluctuations of inter-harmonics of different frequencies, including a single inter-harmonic and a pair of inter-harmonics. In this paper, experiments of voltage fluctuations production and compensation are all carried out. The disturbance producing device makes use of different frequency voltage to modulate inverter output voltage, then the output voltage is superimposed on system voltage, at last voltage fluctuation waveforms of different frequency are produced, the voltage compensation device firstly detect the output voltage of disturbance producing device, and the standard reference 220V is subtracted from it, the result is used to modulate the output voltage of the compensation device, and it get a good compensation effect.

关键词： Voltage fluctuations power system harmonics power systems Inverters Frequency conversion Furnaces Harmonic analysis Information analysis Signal analysis Laboratories

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A Novel Method of Substation Configuration Based on the Virtual Impedance

A Novel Method of Substation Configuration Based on the Virt...

引用

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

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

Substation configuration is a vital part of the power system network topology, and its implementation has taken most of the total time of network topology analysis. The improvement of the network topology efficiency focuses on the faster and more accurate substation configuration based on the distributed modeling formation, which can be finished in parallel way in order to reduce the time consumed. Based on the analysis of the common characteristic of adjacent matrix and node admittance matrix and impedance matrix, a new method of original and tracking topology analysis in the substation has been proposed in this paper, which uses the addition of the virtual switch impedances and the virtual ground branches. The directional treatment to the original adjacent matrix is avoided in this new method. According to the characteristic of node impedance matrix, the work for substation configuration has been realized. Finally, the examples have validated the function of the new method in analyzing the original topology and tracking the variation in switch status. Compared to other methods based on adjacent matrix, this method features the easy-to-program property.

关键词： Substations Impedance Network topology Switches Circuit topology power system analysis computing Circuit breakers power system protection power system dynamics power system security

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

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

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Xiao-yu Zheng Ren-mu He Jin Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

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： Load modeling power system dynamics Analytical models Stability analysis Data models Induction motors

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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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