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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Li, Gang Li, Gengyin Yue, Wei Zhou, Ming Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424480814

Distributed generation (DG) technology has drawn increasing attention for its tremendous benefits to customers, utilities and the environment. Furthermore, microturbine based power generation has become the most promising DG for its excellent record of improving system stability and economy. In this paper we develop a complete mathematic model, which includes the microturbine, a permanent magnet synchronous generator (PMSG), a three-phase bridge AC to DC rectifier, a boost converter and a DC to AC inverter. The simulated microturbine generation system (MTGS) model is a single shaft type with control systems and capable of regulating its output power in grid-connected mode. Also, the design and modeling of a MTGS which is suitable for isolated operation are explained with the ability of electronic controls that maintains the output voltage at their prescribed levels. Different load conditions are applied to the MTGS for evaluation of the validity and practicability of the model. Simulation studies have been carried out in PSCAD/EMTDC under different load conditions. Simulation results testify that the MTGS developed from this model can produce predictable results with these control methods. © 2010 IEEE.

关键词： system stability

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Information entropy based contingency selection for available transfer capability calculation

Information entropy based contingency selection for availabl...

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2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Zheng, Yanan Zhou, Ming Li, Gengyin Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424459407

Available Transfer Capability (ATC) is a measure of the transfer capability remaining in the physical transmission network for further commercial activity over and above already committed uses. Putting forward against the defect that the traditional contingency selection method uses single index to enumerate states or disturbances, this paper introduces the active power behavior index and the voltage-reactive power behavior index, and uses the entropy weight to rank and select the states which seriously affect the system;then from the point of both safety and economy, optimal power flow model is used in every power flow calculation;last introduces the maximum entropy principle to research the probability distribution of ATC. By simulating on the IEEE-14 bus test system, the proposed method has the advantages over the conventional approach in contingency selection, calculation accuracy and processing speed. ©2010 IEEE.

关键词： Probability distributions

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Energy storage control for the photovoltaic generation system in a micro-grid

Energy storage control for the photovoltaic generation syste...

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2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Wang, Zhongqiu Li, Xi Li, Gengyin Zhou, Ming Lo, K.L. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

ISBN: (纸本)9781424480814

Distributed generation (DG) that uses renewable energy sources has an unstable output and this can negatively affect existing electric power systems. In order to reduce above impact, we need to develop an energy control system to control the output through individual DG installed in a micro-grid. First, this paper designs a grid-connected Photovoltaic (PV) system and introduces the operation principle of the various parts as well with the control strategy of the power flow. The design of energy storage is of great significance as the output power of PV cells array is greatly affected by the light intensity and the temperature change. Then, it uses the battery as the energy storage device and designs the charge-discharge control strategy according to the characteristics of the battery. Finally it verifies the feasibility of the energy storage control strategy through the simulation models which is built based on the PSCAD/EMTDC platform. © 2010 IEEE.

关键词： Energy storage

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Analysis of Nonlinear Torsional dynamics Using Second-Order Solutions

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IEEE Transactions on power systems 2010年第1期25卷 423-432页

作者： Wuhui Chen Tianshu Bi Qixun Yang Jixiang Deng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Northeast Dianli University Jilin China

Based on the modal series method, this paper derives the second- and first-order solutions of torques for investigating nonlinear torsional dynamics. The derivatives of the two types of solutions are compared to explain the advantage of the second-order solutions. The index is given for evaluating the feasibility of solutions. Subsequently, several nonlinearity indices are defined to quantify the effects of nonlinear modal interactions on torsional dynamics, and the suitable indices are determined for analyzing nonlinear torsional dynamics. The systematic method is developed for the analysis of nonlinear torsional dynamics. Furthermore, the concept of nonlinear modal interactions is extended to deal with both the fundamental and the combination modes; the nonlinearity contribution factors are emphasized. The study is implemented on two modified cases from the IEEE first benchmark model, which validates the presented method for investigating torsional dynamics in the stressed case and gives new engineering insights into nonlinear torsional dynamics.

关键词： Nonlinear dynamical systems power system dynamics power system transients Modal analysis Torque Bismuth Resonance Steady-state Electromagnetic transients Electromagnetic analysis

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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...

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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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Dominant mode identification for low frequency oscillations of power systems based on prony algorithm

Dominant mode identification for low frequency oscillations ...

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International Conference on Critical Infrastructure

作者： Ding, Lan Xue, Ancheng Han, Fukun Li, Jin Wang, Maohai Bi, Tianshu Wang, Jinping 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

Once the power system low frequency oscillation occurs, the operators desire to find out the dominant mode LFO so as to take measures to suspend it. This paper proposes an identification method for dominant mode of LFO based on Prony algorithm in wide-area measurement system (WAMS). The presented method contains three steps, the first step is preprocessing of Prony analysis result, the second step is the dominant mode identification, and the third step is the grouping of different generators according individual generator's frequency and phase information. Among the dominant mode identification step, three indexes are proposed to select the dominant mode. The first one is the ratio of amplitude and damping ratio;the second one is mode energy and the third one is the amplitude of sinusoidal decay mode after a period of oscillation. The simulation results in a two-area-four-machine benchmark system and 10 generator 39-bus New England system by DSATools demonstrate that the proposed method has strong adaptability to noise, i.e., the method has good performance of identification. © 2010 IEEE.

关键词： Benchmarking

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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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