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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security"

共 617 条记录，以下是261-270 订阅

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A novel active islanding detection method based on current-disturbing

A novel active islanding detection method based on current-d...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Peng Li Yinbo Sheng Ling Zhang Xilei Yang Yishu Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Shandong Electric Power Research Institute Jinan China

Desired islanding detection method not only can detect islanding within acceptable duration, but also require it has less adverse impact on power quality. This paper presents an active islanding detection method for a distributed resource (DG) unit which is coupled to a utility grid through grid-connected converter. With the proposed method which is based on adding periodical disturbing current through current controller of the interface voltage-sourced inverter, islanding can be effectively detected. But when the disturbing current remains unchanged, this method still has some shortages, so this article improved it and used a changed time-varying disturbing current ending with faster detecting time and less disturbing. The studies reported in this paper are based on time-domain simulations in the PSCAD/EMTDC environment. And the results show that the proposed islanding detection method always meets the two-second UL detection requirement.

关键词： Voltage control Inverters Control systems power systems power conversion Frequency Condition monitoring Laboratories power system protection power system dynamics

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Simulation and comparison of transient stability of power system including DFIGs wind farm based on detailed model

Simulation and comparison of transient stability of power sy...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Li Lin Hongjing Hou Wenxia Li Sheng Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Production & Technology Department Zhumadian Electric Power Company Henan China

This article is concerned with the impact of large-scale wind farms utilizing double fed induction generator (DFIG) on the transient stability to a general power system. In the first instance, the synthetical dynamic model of the wind turbine generators (WTGs) is introduced, including pitch angle control model and the generator protective model. And then, the simulation is made to the CIGRE B4-39 standard grid through the comparison between synchronous generator integration and wind farm based DFIG integration with the same power capacity. The simulation is also contained after the load and the topological structure changed. The conclusion shows that the transient stability of the power system including DFIGs wind farm is more robust than conventional synchronous generator connected.

关键词： power system simulation power system transients power system stability power system modeling Wind farms power system dynamics Induction generators power system protection Wind energy generation Synchronous generators

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Enhancement voltage stability of wind farm access to power grid by novel SVC

Enhancement voltage stability of wind farm access to power g...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Junjie Zhang Zhongdong Yin Xiangning Xiao Yajing Di Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424427994

This paper studies the voltage stability problems of wind farm access to electric grid. Based on the equivalent circuit of asynchronous machine, it deduces the relationship of wind turbine angular velocity rotation with the induction generator terminal voltage. Aiming at wind power for 10 kV distribution grid, a novel SVC is proposed to replace the fixed capacitors compensating devices. The reactive power can be detected based on the instantaneous reactive power theory and with this method the reactive power compensation is fast and continuous. The voltage level of wind farm access system is stable with a voltage feedback control strategy. The new SVC winding structure can achieve a multi-pulse, injecting the system small harmonic current component. Research results show that a corresponding control strategy of the novel SVC compensation device can be very good to improve voltage stability of wind farm access to the grid.

关键词： Voltage power system stability Wind farms power grids Static VAr compensators Reactive power Circuit stability Equivalent circuits Wind turbines Angular velocity

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Design of PV Array Model Based On EMTDC/PSCAD

Design of PV Array Model Based On EMTDC/PSCAD

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

作者： Jinhui Xue Zhongdong Yin Bingbing Wu Jun Peng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China North China Electric Power University Beijing Beijing CN

Along with consuming of fossil energy step by step, crisis of energy has been appeared. The solar energy, which is endless, is a kind of renewable energy. Radiation of sun coming to earth in a day is equal to the energy, which is released by trillion buckets of oil. The research of solar energy generation has stepped into a very activity period. This paper analyses the physics characteristic of photovoltaic array firstly, then researches the mathematical model applying in engineering, and designs the total simulation model based on power electronic circuit in the end. In order to validate the correctness and validity, this paper makes a simulation as an example. The scheme can express the V-I characteristic of photovoltaic array very well.

关键词： EMTDC PSCAD Solar power generation Solar energy Photovoltaic systems Mathematical model Circuit simulation Renewable energy resources Sun Earth

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Multi objectives operation of cascade inverter-based voltage quality compensator with PWM rectifier supply

Multi objectives operation of cascade inverter-based voltage...

引用

International Conference on power Electronics and Drive systems (PEDS)

作者： Renzhong Shan Zhongdong Yin Xiangning Xiao Yajing Di Ke Li 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 compensator (VQC) is proposed in this paper, composed of PWM rectifier and cascade H-bridges inverter. The three phase inverter is decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably and provide or absorb real power. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the voltage sag, swell and harmonic compensation is researched by theoretical and simulation. Finally, the simulation results show that the proposed main circuit topology and control strategy is feasible and efficient for multi objectives voltage quality compensation.

关键词： Pulse width modulation inverters Rectifiers Circuit simulation Circuit topology Pulse width modulation Voltage fluctuations Field programmable gate arrays PSCAD EMTDC Voltage control

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A Novel dynamic Var Compensator

A Novel Dynamic Var Compensator

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International Conference on Energy and Environment Technology (ICEET)

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

This paper proposed a novel dynamic reactive power compensation circuit topology which is applicable to low voltage distribution system. It described the composition, features, and working principle of dynamic reactive power compensation system. Open-loop SPWM control strategy is applied for the inverter, by adjusting the inverter output voltage to dynamically regulate the absorption or emission of reactive power by SVC, zero reactive power compensation of the system can be achieved. With the combination of fixed compensation capacitor the capacity of the inverter can be smaller when it compensates the reactive power dynamically, it can improve the power factor and voltage level fast, efficiently and reliably. It overcomes the switching oscillation and the shortcomings of inadequate compensation, at the same time, reduce power loss and improve the voltage quality.

关键词： Reactive power Inverters Reactive power control Circuit topology Low voltage Open loop systems Voltage control Control systems Absorption Static VAr compensators

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A Novel Hybrid dynamic Reactive power Compensator

A Novel Hybrid Dynamic Reactive Power Compensator

引用

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

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

A novel dynamic reactive power compensation circuit topology suitable for low voltage distribution system was proposed. The efficient compensation of unbalanced load could be realized by the structure of three-phase four-leg inverter circuit. The sinusoidal pulse width modulation (SPWM) control of inverter could ensure the low distortion of voltage and current. Besides, by the regulation of the inverter's output voltage, the compensation reactive power could be dynamically regulated and the aim of system's zero reactive power compensation could be realized. Combined with fixed capacitor compensator, small capacity of inverter is required to compensate dynamic reactive power. The novel dynamic static var compensator (SVC) could improve the system's power factor and voltage stability. Finally, simulations are carried on the platform of PSCAD/EMTDC. The results show that the proposed control strategy is feasible and efficient.

关键词： Reactive power Pulse width modulation inverters Low voltage Static VAr compensators Circuit topology Pulse inverters Voltage control Capacitors Stability PSCAD

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A Novel Low Harmonic dynamic Static Var Compensator Resaerch

A Novel Low Harmonic Dynamic Static Var Compensator Resaerch

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Renzhong Shan Zhongdong Yin Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China 102206

ISBN: (纸本)9781424427994

A novel SVC topology is proposed in this paper, firstly a multi-winding transformer is adopt to realize 12 ripple, secondly the 5th harmonic filter on system bus as the fundamental reactive power compensation, and control thyristor controlled reactor (TCR) to realize inflow system reactive power, thirdly modularization design is adopted, according to the compensation reactive power only one TCR module is phase controlled. Finally, the experimental result shows that the novel TCR without an additional filter has the advantages of low harmonic, good static and dynamic performance, small volume and etc, compared to traditional TCR.

关键词： Reactive power Var compensation Thyristor controlled reactor Harmonic current 12 ripples Modularization

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A method of tracking voltage flicker envelope real-time

A method of tracking voltage flicker envelope real-time

引用

IEEE General Meeting power& Energy Society

作者： Xiufang Jia Qing Chen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China North China Electric Power University Baoding Hebei China

Fast and accurate tracking of voltage flicker envelope is significant to the performance of flicker meter, flicker source location and the mitigation of voltage flicker. Using the energy of a signal and its shifted signals to track the envelope of voltage flicker is presented in this paper. It is assumed that the signal is shifted, once by a lead angle equal to beta, and at another time by a lag angle equal to beta, which generates two new signals u + (t) and u - (t). According to the energy differences, the relationship between the flicker amplitude and u(t), u + (t), u - (t) can be obtained, so the voltage flicker envelope is successfully tracked. How to obtain the shifted signals u + (t), u - (t) is analyzed in the paper. The frequency error e f (%), amplitude error e m (%) and waveform standard deviation sigma(%) are used as the weighing index of the accuracy of tracking flicker envelope. The theoretical analyzing and RTDS simulation test verify that the suggested method is accurate, fast and anti-noise.

关键词： Voltage fluctuations Frequency Signal analysis Envelope detectors power quality Wavelet transforms Narrowband Filters Blind source separation Noise reduction

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A study on VSC-HVDC based black start compared with traditional black start

A study on VSC-HVDC based black start compared with traditio...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Sheng Li Mingxia Zhou Zongqi Liu Jianhua Zhang Yinhui Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China Department of Electrical Engineering School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

A good black-start scheme is important and necessary to resume power supply fast and efficiently after black out, and how to choose black-start power is the first thing to consider in the scheme. In this paper, the advantages of VSC-HVDC as black start power are analyzed with contrast to traditional black start power. The ability of VSC-HVDC to soft energize major power system equipment is proved through simulation by software PSCAD/EMTDC. Simulation waveforms during soft energization are illustrated. These plots have described the good voltage and frequency characteristics of VSC-HVDC. The transition from one control mode of VSC to another is also discussed. Simulation results indicate that by using soft energization, VSC-HVDC is an ideal black start power.

关键词： Converters power conversion PSCAD power system harmonics power system simulation power system restoration Voltage control power system transients Frequency Transformers

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