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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Peng Li Bin Song Wei Wang Tiemin Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Baoding Tianwei Wind Power Blade Company Limited Baoding Hebei China

Considering the operation of microgrids (MGs) composed of distributed generations (DGs) and loads, a service restoration model aiming at the restoration of the most load with giving priority to the important load power supply is built. On the basis of the proposed hierarchical control strategy, this paper builds up a multi-agent system (MAS) for service restoration of microgrid. Accordingly, the special functions and control strategies of each agent are discussed in detail. A simulation example of a particular microgrid based on the multi-agent system is performed to demonstrate that the efficiency and reliability of the microgrid can be improved by using MAS.

关键词： power system restoration Multiagent systems Distributed control control systems Cogeneration power system modeling power system reliability Artificial intelligence Communication system control Switches

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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...

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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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The implication and implementation of smart grid in China

The implication and implementation of smart grid in China

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IEEE General Meeting power& Energy Society

作者： Tianshu Bi Sumei Liu Zhenyu Huang Nouredine Hadjsaid Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control under Ministry of Education North China Electric Power University Beijing China Pacific Northwest National Laboratory Richland WA USA INP Grenoble Domaine Universitaire Saint Martin d'Heres France

In recent years, smart grid becomes the trend of future power systems in China and abroad. Present status and the facing challenges of electric power industries in different countries are different, and thus the understanding and the development plan of smart grid are also different from one country to another. In this paper, the motivations and implications of smart grid in USA, Europe and China are compared. Furthermore, the implementation and the key technologies of smart grid in China are introduced.

关键词： Smart grids Electricity Reliability power system reliability Real time systems

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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...

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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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Monte Carlo simulation based assessment of available transfer capability in AC-DC hybrid systems

Monte Carlo simulation based assessment of available transfe...

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International Conference on Critical Infrastructures, CRIS

作者： Junqiang Wei Gengyin Li Ming Zhou K L Lo Department of Mathematics North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

Available transfer capability (ATC) is defined as a measure of the system's capability for transfers of power for further commercial activity, over and above already committed uses. In practical power markets, ATC can provide important information for transmission customers, system operators and power marketers. The assessment of ATC should be carried out to assure the secure, economic, stable and reliable operation of power systems. Most of the existing ATC calculation are mainly focused on AC power system and based on deterministic techniques. As high voltage direct current (HVDC) power distribution systems have been extensively used in modem transmission network, less work has been done on evaluation of ATC in AC-DC hybrid power system. This paper is dealing with the evaluation of ATC for the integration of HVDC link with an AC power system. The mathematical model of ATC for AC-DC hybrid power system is proposed. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of hybrid power systems, several statistical indices are presented to evaluate ATC and they are calculated based on Monte Carlo simulation. States of system operation can be simulated, and the algorithm based on MATpower (A MATLAB™ power system Simulation Package) is developed in the environment of MATLAB 7.5. Case study with a modified IEEE 30-bus AC-DC hybrid power system is used to verify the presented approach. Sequential solution method is employed to deal with the AC-DC power flow. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method is effective and practical. The research achievements are undergoing to transfer to the application in other hybrid power systems with different control style, and some new problems are suggested at the end of paper.

关键词： Load flow Monte Carlo methods power system dynamics HVDC transmission Hybrid power systems Mathematical model

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Stochastic parallel algorithm based evaluation of Available Transfer Capability

Stochastic parallel algorithm based evaluation of Available ...

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International Conference on Critical Infrastructures, CRIS

In practical power markets, Available Transfer Capability (ATC) is crucial for transmission customers, system operators and power marketers to make a good choice. It is an indication of the expected transfer capability remaining on the transmission network. In order to assure the secure, economic, stable and reliable operation of power systems, the assessment of ATC should be carried out instantly. Most of the existing ATC calculation are mainly focused on AC power systems and based on deterministic techniques. As high performance computing has been extensively used in scientific computation and technology, less work has been done on evaluation of ATC by using parallel algorithm. This paper is dealing with the evaluation of ATC by stochastic parallel algorithm in an AC power system. Due to the stochastic nature of power system behaviors, it is important to assess ATC from a statistical and risk analysis point of view. Considering the dynamics, time-varying and uncertainties of power systems, several statistical indices is presented to evaluate ATC. They are calculated based on Monte Carlo simulation and parallel computing. The system operation states can be simulated by Monte Carlo method, and the parallel algorithm based on MATpower (A MATLAB™ power system Simulation Package) is developed. Case study with an IEEE 30-bus power system is used to verify the presented approach. Five-number summary and other statistical indices of ATC are calculated. The results show that the proposed method can elapse shorter computation time and it is more effective and practical. Some new attractive issues are suggested at the end.

关键词： Monte Carlo methods Load flow power system dynamics Uncertainty Parallel algorithms

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A transformer fault diagnosis method integrating improved genetic algorithm with least square support vector machine

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Dianwang Jishu/power system Technology 2010年第2期34卷 164-168页

作者： Zhang, Kai Huang, Hua-Ping Yang, Hai-Tao Xie, Qing Shijiazhuang Power Supply Corporation Shijiazhuang 050000 Hebei Province China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Baoding 071003 Hebei Province China Communication and Dispatching Center of Guang'an Electric Power Bureau Guang'an 638000 Sichuan Province China

Least square support vector machines (LS-SVM) can solve small sample nonlinear multi-classification problem well, so it is applicable to the power transformer fault diagnosis by dissolved gas analysis (DGA), however the selection of parameters c and σ2 greatly impacts the diagnosis result, thus the optimized selection of these parameters is necessary. In this paper, the improved genetic algorithm (IGA) is applied to the optimized selection of c and σ2. The initial population of IGA is randomly generated by coding mechanism, in this way, the search space can be quickly expanded and the diversity of individuals in the populations can be stabilized, thus both global search ability and convergence speed can be effectively improved. The LS-SVM optimized by IGA is applied to fault diagnosis by multi-sets of chromatographic data of transformer oil and the result shows that optimizing LS-SVM by IGA, the optimized selection of c and σ2 can be implemented effectively and the accuracy of power transformer fault diagnosis can be improved.

关键词： Failure analysis

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Comprehensive evaluation method of power quality based on variable weight and set pair analysis

Comprehensive evaluation method of power quality based on va...

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IEEE General Meeting power& Energy Society

作者： Guodong Li Gengyin Li Xiang Li Ming Zhou Xiaodong Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electrical Engineering Tsinghua University Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

In this paper, variable weight theory and set pair analysis (SPA) theory are applied to comprehensive evaluation of power quality. Among existing comprehensive evaluation methods of power quality, the problems about index uncertainty and imbalance case are less considered. The application of variable weight SPA, for ensuring identical discrepancy contrary (IDC) of unsure system, effectively reduces the complication of assessment process. Variable weight SPA uses the hybrid model of variable weight to modify power quality indices vector, and the final weights of indices could be determined. Then it takes advantage of new weight vector to compute the relativity coefficient of power quality assessment points. Finally the levels of power quality assessment points are assessed by their relativity coefficient. The results of the simulation show that the method used to carry out comprehensive evaluation of power quality is simple, and the classification is detailed. This method could effectively decrease the impact on index uncertainty to assessment results.

关键词： power quality Indexes Uncertainty Voltage fluctuations Electrical engineering Entropy

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A methodology for power quality evaluation in distribution network with distributed generation

A methodology for power quality evaluation in distribution n...

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International Conference on Critical Infrastructures, CRIS

作者： Gengyin Li Zhe Zhang Xiang Li Song Wang 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 Department of Electrical Engineering Tsinghua University Haidian Beijing China School of Electrical and Computer Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

The issue of power quality in the distribution system is always in sense of the concern. With the high penetration of distributed generation (DG) currently, it tends to be more complicated. This paper presents a new approach to evaluate impacts of the DG on power quality of the distribution network. In the process an objective function will be modeled, which will be solved by the optimization toolbox, in order to calculate the result for the evaluating grade. Furthermore, the results of the overall evaluation will be given via the eigenvalue weighted method. The power quality ranking of each feeder with the distributed generators in the distribution network will be apparent with the given weight of influence caused by DGs divided in forms of energy resource.

关键词： power quality Generators Indexes Distributed power generation Eigenvalues and eigenfunctions Optimization Voltage fluctuations

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power distribution network planning optimization based on life cycle cost (LCC)

Power distribution network planning optimization based on li...

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China International Conference on Electricity Distribution, CICED

作者： Haifeng Su Jianhua Zhang Zhirui Liang Shengsuo Niu North China Electric Power University Baoding 071003 Hebei Province China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Changping District Beijing 102206 China

Combined with the characteristics of conventional distribution network planning, this article proposed a new power distribution network planning optimization method that based on the minimum life cycle cost (LCC) to decide distribution network planning scheme. The life cycle cost calculation model for distribution network planning scheme is made on the premise that the power network operate safely and steadily, in order to obtain the minimum life cycle cost (LCC) as the objective function and use the multi-particle swarms cooperative optimization algorithm to optimize the distribution network path planning, while according to comparative analysis of different layout patterns of switch with LCC to obtain the minimum LCC planning scheme. Finally, the feasibility and effectiveness of the method are verified by the result of applying it to a test system.

关键词： Planning Search problems

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