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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161-170 订阅

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Intelligent diagnosis algorithm of power equipment based on acoustic signal processing

Intelligent diagnosis algorithm of power equipment based on ...

引用

International Workshop on Advanced Computational Intelligence (IWACI)

作者： Shutao Zhao Baoshu Li Yumin Ge Weiguo Tong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China School of Control Science and Engineering North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424463343

The operational state determination of power equipment is a key prerequisite to realize maintenance. On studying the relationship between power equipment state and its acoustic wave mutation character, a new diagnosis scheme of power equipment fault has been put forward. After the running acoustic signal acquired, MFCC coefficient has been selected the acoustic signal various band energy feature, and dynamic time warping (DTW) is utilized to determine equipment type. Then local energy band based wavelet packet decomposition is used in fault feature extraction. According to these feature parameters values and expert experience scoring, the knowledge based of fault database was established to diagnosis power equipment state and its fault level. Lastly, By 200 group transformer measured acoustic signal analysis experiments have been completed, and the results show the series acoustic treatment of methods is effective, and the diagnosis scheme of equipment failures have great practical value.

关键词： Feature extraction Wavelet packets Fault diagnosis Mel frequency cepstral coefficient Band pass filters

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A scheme of connecting microgird to AC grid via flexible power electronics interface

A scheme of connecting microgird to AC grid via flexible pow...

引用

International Conference on power system Technology (powerCON)

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

Based on the synthetic control of microgrid, a flexible power electronics interface is developed in this paper. Considering distributed generation types and storage devices, different control strategies are adopted in controller design for different distributed generation units. The interface comprises a couple of back-to-back VSC converters, and exports variable active power and reactive power in order to maintain the power balance inside the microgrid. Apparently, the interface separates the microgird from the AC grid, prevent harmonic component transmitting from one side to the other side and control the active power precisely flowing between microgrid and main grid. Besides, it's also in charge of reactive power compensation and keeping the microgrid voltage stable. Simulation results can approve its superiority and validity comparing with direct connection.

关键词： Joining processes Reactive power Voltage control Converters Inverters Distributed power generation

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Comparison of Transient Stability between Wind Farm Based on DFIG and Traditional power Plant in an Actual Grid

Comparison of Transient Stability between Wind Farm Based on...

引用

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

作者： Hongjing Hou Li Lin Tao Wu Youzhong Miao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China North China Electric Power Research Institute Company Limited Beijing China

As a clean renewable energy, wind energy draws more and more attention around the world. In case of high wind speed or low speed but substantial installed wind power capacity, wind turbine generators (WTGs) will take the place of traditional power plant partly. Under the circumstance, the transient stability will change. Therefore, in this article, the synthetical dynamic model of WTG is introduced first, and on the basis of it, the article focus on the comparison of transient stability characteristic between wind farm based on double fed induction generator (DFIG) and tradition power plant with the same capacity. Take an actual grid including wind farm as an example. The power factor of the wind farm is 1.00 and keeps constant during steady state. Under this control mode, the reactive power between wind farm and the grid is zero. The study indicates that, in this system, when the scale of wind farm connected is below 12.3%, the transient stability is better than synchronous generator integrated with the identical capacity. And with the increasing capacity of wind farm, the fault critical clearing time (CCT) is shorter, and it lasts longer time during the recovery. When the scale of wind farm exceeds 12.3%, the terminal voltage of point of common coupling (PCC) is below 0.95 p.u. The stability is inferior to the synchronous generator connected. Under the circumstance, the stability will be enhanced through adding the reactive power compensative device.

关键词： Stability Wind farms power generation Wind energy Reactive power Synchronous generators Renewable energy resources Wind speed Wind turbines Wind energy generation

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An adaptive distance protection scheme for distribution system with distributed generation

An adaptive distance protection scheme for distribution syst...

引用

International Conference on Critical Infrastructures, CRIS

作者： Jing Ma Jinlong Li Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Chengdu Electric Power Bureau Chengdu Sichuan China

ISBN: (纸本)9781424480807

The value setting of the traditional distance protection has become very difficult for the distribution system with distributed generators (DGs) owing to the randomness of the DG output power. This paper proposes a new adaptive distance protection scheme to solve this problem. Firstly, on the basis of the connected point of DGs, the protected feeders are divided into different zones, with adaptive distance protection configured at the upstream side of DG. Then, based on a fault characteristic analysis of the distribution system with DG, the adaptive distance protection scheme for the distribution system with DG is studied to solve this problem. The results show that this scheme can automatically calculate the settings according to the operation mode and the output power of DG with no need for communication. Compared with the traditional adaptive protection scheme, the performance of this method is greatly improved. Simulation results on a 10 kV distribution system have verified the validity of the scheme proposed.

关键词： Relays power systems Adaptive systems Sensitivity Simulation Impedance Distributed power generation

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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...

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International Conference on Critical Infrastructures, CRIS

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

ISBN: (纸本)9781424480807

In this paper, control strategies of VSC-HVDC aiming to improve the ability of fault ride through of the VSC-HVDC 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.

关键词： power conversion Voltage control HVDC transmission Inverters Steady-state

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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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Comparison and Conversion of dynamic Models of Speed Governor for Transient Stability Analysis in BPA and PSS/E

Comparison and Conversion of Dynamic Models of Speed Governo...

引用

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

作者： Li Lin Kun Zhang Feng Sun Qunju Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China North China Electric Power Research Institute Company Limited Beijing China

In the paper, the principle of speed governor of synchronous machine is discussed firstly. Based on this, mathematical models of the speed governors of BPA and PSS/E are compared to find the corresponding relationship of the speed governor models between BPA and PSS/E. The corresponding models have been validated by simulation of a single machine infinite bus system and the quantitative analysis of conversion error between models is given. The results indicate that the corresponding speed-governor models of BPA and PSS/E have good consistency, so conversion of corresponding speed-governor models between BPA and PSS/E can be entirely achieved for transient stability analysis.

关键词： Transient analysis Stability analysis power system modeling power system simulation power system dynamics PSCAD power system transients Analytical models power system planning power system analysis computing

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Compound control algorithm based on a novel topology of current compensation apparatus

Compound control algorithm based on a novel topology of curr...

引用

International Conference on Critical Infrastructures, CRIS

作者： Liu Yukun Xiao Xiangning Lei Xiao Wang Xiangxu Wang Jin Key Laboratory of Power Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing P.R.China

ISBN: (纸本)9781424480807

This paper theoretically analyzes the compound control apparatus for current quality compensation which is designed as differentiation cascaded H bridge type with two modules: fundamental-frequency module and high-frequency module. The detection algorithm calculates the harmonic current and fundamental-frequency current of the load current which serve as the command current. For the purpose of eliminating the steady periodic error of system and improving the tracking accuracy of the compensation current, PI and repetitive controller in parallel is introduced as a advanced current control method. A detailed analysis and design for the high-frequency module is presented based on frequency characteristic and steady state. A 10kV system simulation model based on PSCAD/EMTDC is built to analyze the control strategy. Finally, the experimental results illustrate that the proposed control strategy is feasible and provide a reference for the 10kV industrial apparatus.

关键词： Harmonic analysis power harmonic filters Load modeling Switching frequency Compounds

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A droop control method of microsources based on divided self-adjusting slope coefficient

A droop control method of microsources based on divided self...

引用

International Conference on power system Technology (powerCON)

作者： Peng Li Wei Wang Xilei Yang Shuai Wang Hongfen Cui Changzheng Gao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Jilin Electric Power Company Limited Changchun Jilin China

Microgrid, as a new effective way for large scale new energy and renewable energy power generation systems connected to the grid, injects new vigor into the power system. Focusing on the characteristics of P-f (active power versus frequency) droop and Q-V (reactive power versus voltage) droop, on the basis of analyzing the variable slope coefficient of droop characteristic, a droop control method of microsources based on divided self-adjusting slope coefficient is proposed in this paper. By calculating the quantity of the load fluctuation, this control method dynamically adjusts the active and reactive power maximums of inverters in the range of the inverter ratings to change the slope coefficients of droop curves. The aim of this method is to decrease the deviation of the frequency and voltage magnitude of the microgrid bus effectively. The simulation result verifies the correctness and feasibility of this control method.

关键词： Reactive power Inverters Fluctuations Voltage control Artificial neural networks

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Compensation strategy of switching dead-time effect based on frequency domain model

Compensation strategy of switching dead-time effect based on...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

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

The problem of current waveform distortion because of dead-time inserted in power electronic applications is analyzed and researched in this paper, and the equivalent voltage source model is set up in to analyze the low frequency harmonic voltage because of dead-time effect. The control strategy of harmonic injection is proposed to compensate the current distortion due to dead-time effect. Firstly, obtains the application output current amplitude and phase of mainly harmonic current by Fourier transform, then calculates the compensation instructive voltage according to the connected inductor and dc voltage. Based on H-bridges cascaded static synchronous compensator (STATCOM), the experiment on a STATCOM based on digital signal processor (DSP) and (Field Programmable Gate Array) FPGA is implemented. The simulation and experimental results show that the proposed method is feasible and efficient to compensate the current distortion.

关键词： Frequency domain analysis Harmonic distortion Harmonic analysis Automatic voltage control Field programmable gate arrays power electronics power system harmonics Low voltage Fourier transforms Inductors

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