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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 542 条记录，以下是121-130 订阅

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A new node contribution factors for the low frequency oscillations of power system based on the PMU's data and HHT

A new node contribution factors for the low frequency oscill...

引用

International Conference on Critical Infrastructure

作者： Li, Jin Xue, Ancheng Wang, Jinping Ding, Lan Wang, Maohai Bi, Tianshu Han, Fukun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China North China Power Dispatching Center Beijing 100053 China North China Electric Power Research Institute Co.Ltd Beijing 100045 China

ISBN: (纸本)9781424480814

With the rapid development and interconnection of power systems, the low frequency oscillations(LFO) has become one of the serious factors threatening the power system stability. Thus, how to quickly locate the source of LFO and implement controller to suspend it, is an urgent task. The general approach to locate the sources of LFO is using the node contribution factor(NCF), which indicating the contribution of the node(generator) in the oscillation. This paper aims at proposed a new more effective method to calculate the NCF for LFO based on the HHT and data obtained with Wide Area Measurement system (WAMS). As general philosophy, the proposed NCF is defined as the ratio of the generators' node oscillation energy(NOE) and the total oscillation energy(TOE), related to a particular oscillation mode. The NOE and TOE is defined based on the intrinsic mode functions(IMFs), which is obtained with the application of the HHT method. In detail, the (individual) node oscillation energy is defined as the product of the node's oscillation amplitude and cosine of relative phase. And the TOE, is defined the positive (or reverse respectively) group total energy for the node in the positive or reverse respectively, where the positive (or reverse respectively) group total energy is the cumulative energy of all nodes in the positive(or reverse respectively) group. And the generator grouping is obtained according to the phase, which is defined for the IMFs obtained with the HHT method. Simulation results in 4-machine and 17- machine system show that the proposed algorithm for NCF is more effective than the existed algorithm. And furthermore, the active power signals have better performance than the angle signals. © 2010 IEEE.

关键词： Intrinsic mode functions

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A novel method for determining minimum break point set based on network reduction and relays incidence matrix

A novel method for determining minimum break point set based...

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International Conference on Critical Infrastructures, CRIS

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

This paper presents a simple and effective approach based on two dynamic matrixes of node-relay matrix (NRM) and relay-incidence matrix (RIM) to determine minimum break point set (MBPS) for coordination of the directional relays. Firstly, the NRM and RIM are defined and their calculation methods are developed. Then, some optimization operations for network reduction and special structure are presented to update the NRM and RIM and the detailed flowchart is provided. At last, case studies on various topologies demonstrate the effectiveness and simplicity of the proposed method.

关键词： power system dynamics Phantoms Network topology Protective relaying Heuristic algorithms

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A combined prediction method of wind farm power

A combined prediction method of wind farm power

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International Conference on Critical Infrastructures, CRIS

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

ISBN: (纸本)9781424480807

Wind power forecasting has great significance to the connection of wind farms to the electric power system. This paper analyzes individual forecast models, such as the time series forecasting, Elman network forecasting that based on the chaos theory, grey neural network forecasting, and generalized regression neural network forecasting, etc., then puts forward an entropy weight combination prediction model, and an optimal combination forecasting model for the wind power forecasting that based on vector angle cosine. The forecasting results indicate that due to the different forecast precisions of different methods, the methods with high precisions may bring great variation in some points, and the combination forecast can reduce the forecasting variation in several points, which improve the forecasting precision.

关键词： Forecasting Predictive models Wind forecasting Wind power generation Artificial neural networks Entropy Wind farms

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Multi-level voltage quality adjustment device based on FPGA control

Multi-level voltage quality adjustment device based on FPGA ...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

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

This paper studies the FPGA-based control 4 H-bridge cascaded 9-level structure of voltage quality adjustment device, for the variety of voltage quality issues appears in electric power system, providing a comprehensive solution. With the voltage swell, voltage sag, voltage harmonics, voltage fluctuations which occurs in the power system, it can give out the complex compensation, so as to ensure the system voltage quality, 0.1MVA/400V Low-voltage prototype was designed and developed for validating the variety of experiments. Experimental results show that the design of this device is feasibility and effectiveness.

关键词： Field programmable gate arrays Voltage control Voltage fluctuations power quality power system harmonics Circuit topology control systems Prototypes Inverters Circuit testing

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Study on Characteristics of Multi-Phase Rectifier system Based on Phase-Shifting Reactor

Study on Characteristics of Multi-Phase Rectifier System Bas...

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

作者： Ning Kong Zhongdong Yin Ruochen Cui Po Yang Zhijian Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education (North China Electric Power University) Beijing China

In view of the harmonic problems caused by plenty of nonlinear load, especially large-capacity rectifiers, are becoming more and more serious, a kind of harmonic suppression method based on phase-shifting reactor (PSR) is studied in this paper. The problem of determination of the winding turns aiming at a certain phase-shifting angle is solved through theory analysis and calculation. And the topological structure of multi-phase rectifier system composed by cascade phase-shifting reactors is introduced. Also, a method of determining the phase-shifting angles is proposed and the characteristic harmonic of rectifier system is suppressed comprehensively. At last, simulation and experiment of twelve-phase rectifier system composed by phase-shifting reactors are made and the results show that using phase-shifting reactors can realize the same effect as phase-shifting transformers. The harmonic caused by rectifier system can be suppressed very well by phase-shifting reactors.

关键词： Rectifiers Inductors power system harmonics Iron Transformers Laboratories Harmonics suppression Voltage Electrical equipment industry power system protection

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The theoretical analysis and compensating experiment of voltage fluctuation

The theoretical analysis and compensating experiment of volt...

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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...

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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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power system transmission section security protection control program

Power system transmission section security protection contro...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Gang Li Zeng-Ping Wang Jian-Wen Ren Xu-Feng Zhen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Baoding Power Supply Company Baoding China

The removal of overload lines can cause power flow transferring, which may give rise to some transmission lines overload. By analysis of available methods of determining transmission sections with shortcomings, this paper proposes a new way to determine transmissions section based on real-time power flows, and then deduce a new criterion of transmission section security protection based on the redundancy of normal line's power flows. A new transmission section security protection control scheme based on wide area measurement system (WAMS) is also proposed. When there is line overload, we should make a decision according to the protection criterion, if the transmission lines are safe after the overload removal, allow the backup protection to cut off the overload line; if not, block the protection. Therefore, it can avoid cascading overload tripping. At last, the validity of proposed algorithm is verified by the simulation results of CEPRI 36-bus system.

关键词： security Load flow Redundancy Real time systems power system dynamics Machine learning

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A transmission line overload control program based on wide area information

A transmission line overload control program based on wide a...

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International Conference on Machine Learning and Cybernetics (ICMLC)

When taking emergency control measures to eliminate the overload circuits, it is necessary to ensure the normal lines of power system won't overload. Therefore, it's necessary to analyze the security of the normal lines when take measures to eliminate overload. Based on the analysis of traditional methods of eliminating overload lines, this paper proposes an new overload control scheme based on wide area information, which can in parallel analyzing the impact of the normal line's redundancy on the regulated quantity of matching units, then the analysis results are sent to the control center, which finally determines the regulated quantity. It can ensure the normal lines won't overload when eliminating overload, and also can improve the computing speed of the whole control process. Therefore, it's very conducive to ensure the power system operating in a safe and stable state. Finally, simulation experiments verify the program is fast and reasonable.

关键词： Sensitivity security Load flow power system dynamics Redundancy Machine learning

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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...

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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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