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2009 Asia-Pacific power and Energy engineering Conference, APPEEC 2009

作者： Wang, Zhenshu Li, Linchuan Niu, Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China School of Electrical Engineering Shandong University Jinan China State Nuclear Electric Power Design and Research Institute Beijing China

ISBN: (纸本)9781424424870

At present, the load modeling is still one of the difficult problems in power system. In this paper, a new method is presented which uses wide-area measurements and support vector machine (SVM) for load modeling. Based on wide-area measurements, this method does non-linear regression analysis on model with SVM. By using radial basis function (RBF), model structure is optimized, and Bayesian Framework is used for identifying parameters, then a kind of non-mechanical model is founded. This method can easily solve the problems in choosing structure and identifying parameters. The founded model has good generalization ability, flexible structure, and rapid calculation speed. In the end, this method has been programmed;the simulation verifies the validity of this model. © 2009 IEEE.

关键词： Support vector machines

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Load forecasting scheme based on energy efficiency for planning the expansion of electrical systems

Load forecasting scheme based on energy efficiency for plann...

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2009 IEEE Bucharest powerTech: Innovative Ideas Toward the Electrical Grid of the Future

作者： Cerda Arias, J.L. Westermann, D. Department of Power System Faculty of Electrical Engineering and Information Technology Technology University of Ilmenau Gustav-Kirchhoff-St. 01 D-98693 Ilmenau Germany Technology University of Ilmenau Ilmenau Germany Institute of Electric Power and Control Technologies Ilmenau University of Technology Germany

ISBN: (纸本)9781424422357

A fundamental phase in the electrical systems planning is the temporal and spatial load forecasting. By changes in the structures of electricity markets and implementing policies for energy optimization, it is necessary to consider new variables that detail of better form the behaviorś forecasting and expansion of the electrical consumption to medium and long time. This work proposes a global load forecasting scheme to long-time, covering the topic temporal and spatial. The load forecasting proposes based in the influence of macroeconomic variables, implementing energy efficiency policies and the entry of new technologies that optimize their consumption. The proposed strategy combines load forecasting methods based on traditional methodologies with the implementation of the wavelets transformed and is validated through a sensitivity analysis for a real data set. Also, the model is applied to a real distribution system showing the potential for their use. © 2009 IEEE.

关键词： Energy efficiency

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A kind of low leakage inductance planar transformer

A kind of low leakage inductance planar transformer

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2009 IEEE 6th International power Electronics and Motion control Conference, IPEMC '09

作者： Yugang, Yang Lee, Fred C. Hongzhu, Li Jiaju, Wu Liaoning Technical University Institute of Electrical and Control Engineering Huludao 125105 China Virginia Polytechnic Institute State University Center for Power Electronics System Blacksburg VA 24061 United States Nanchang Hangkong University Nondestructive Test Key Laboratory of Ministry Education Nanchang 330034 China

ISBN: (纸本)9781424435562

It's necessary to decrease the leakage inductance of transformer because it often produces a large voltage peak as device is turned off, meanwhile the large voltage peak is a source of EMI and produces a large voltage stress and affects the power supply's efficiency. This paper proposes a kind of low leakage inductance planar transformer with shunt magnetic circuit structure, the primary winding number of this structure can be decreased to 1 turn and the equivalent secondary winding can be decreased to less than 1 turn, therefore the leakage inductance can be decreased remarkably, and it can be used to various turns ratio of high frequency transformer expressly in the transformer of low voltage and large current power supply. This shunt magnetic structure is verified with Maxwell 3D. ©2009 IEEE.

关键词： Inductance

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Measurement of micro-scale two-phase flow in a pulsating heat pipe using electrical capacitance tomography

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical engineering 2009年第17期29卷 103-107页

作者： Li, Jing-Tao Xiao, Hai-Ping Dong, Xiang-Yuan Liu, Shi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Changping District Beijing 102206 China School of Energy and Environmental Engineering Zhongyuan Institute of Technology Zhengzhou 450007 Henan Province China

The electrical capacitance tomography (ECT) system was used to the visualization of the two-phase flow as well as the measurement of the film thickness in a pulsating heat pipe (PHP). The new-developed micro-sensor was also applied as a part of the flow channel, with the characteristics of heat transfer and hydrodynamics similar to the measured tube. The measurement accuracy and the image resolving power were improved as compared with the conventional sensors. So the applied area of the ECT technology was widened. The experimental results indicate that there might exist three flow patterns, i.e. bubble-liquid slug flow, semi-annular flow and annular flow, corresponding to different operating conditions. The measurement results of the film thickness compare well with the actual conditions, and the trend of the film thickness can realize the identification of the flow patterns.

关键词： Two phase flow

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Dynamical Simulation of Laboratory MicroGrid

Dynamical Simulation of Laboratory MicroGrid

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

作者： Yishu Zhao Li Guo Department of Electrical Engineering Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

A micro-grid can increase the reliability of energy supplies by disconnecting from the grid in the case of network faults or reduced power quality. The techniques that have been investigated to control micro-grids in both modes are summarized as well as those proposed to maintain stability during the transitions from one mode to the other. This paper first introduces the micro-grid planning structure in Shandong Electric power Research institute (SEPRI) and discusses the various feasible control approaches used and presents for micro-grid. Then, based on modeling different types of distributed generations and energy storage equipment, the SEPRI Micro-Grid model was simulated with several operating modes under peer to peer control strategy. The importance of an energy storage to assist stability during transition between the operating modes is emphasized.

关键词： Laboratories Hydroelectric power generation Wind energy generation power generation Stability Energy storage Wind turbines Fuel cells Topology power system simulation

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A New Coupled Inductors Design in 2-Phase Interleaving VRM

A New Coupled Inductors Design in 2-Phase Interleaving VRM

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第六届IEEE国际电力电子与运动控制会议 (2009 IEEE 6th International power Electronics and Motion control Conference-ECCE Asia

作者： Yang Yugang Yan Dong Fred.C.Lee Liaoning Technical University/Institute of Electrical & Control Engineering Huludao125105China Vir Virginia Polytechnic Institute and State University/Center for Power Electronics System BlacksburgV

In order to adapt the power delivery requirements of modern microprocessors of high current, low voltage and faster transient response, interleaving VRM with coupled inductors should be used. At first, this paper presents a numerical analysis of benefits of 2-phase coupled inductors and gives out the region of coupling coefficient in which the transient response speed increases meanwhile the steady-state ripple current decreases, coupled inductors should be designed in this region. Secondly, this paper proposes a novel magnetic coupling structure of 2-phase coupled inductors and sets up its magnetic model to simplify the coupling structure and reduce the winding length. Its validity is verified with 3D FEA simulation.

关键词： Inductors Interleaved codes Coupling circuits Steady-state Inductance Transient response Magnetic cores Microprocessors Low voltage Numerical analysis

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Based on Particle Swarm Optimization and Simulated Annealing Combined Algorithm for Reactive power Optimization

Based on Particle Swarm Optimization and Simulated Annealing...

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

作者： Zhenshu Wang Linchuan Li Bo Li Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China School of Electrical Engineering Shandong University Jinan China Shandong Electric Power Engineering Institute Jinan China

This paper presents a novel combined algorithm based on particle swarm optimization (PSO) and simulated annealing algorithm(SA) for power system reactive optimization. According to the characteristics of PSO and SA, the proposed method which combined PSO and SA efficiently makes good use of easily implementing performance and fast convergence performance of PSO and global convergence performance of SA, and makes them search in phase. This paper detailed explains coding of control variables, selecting of parameters and material steps of combined algorithm for optimizing reactive power. Taking the IEEE 14-bus system, IEEE 57-bus system and IEEE 118-bus system for example, the simulation results demonstrate that the proposed method is simple and easy to implement, and has high computing efficiency and comparing with conventional PSO it can obtain higher quality solutions.

关键词： Particle swarm optimization Simulated annealing Reactive power power system simulation Reactive power control power generation Convergence Voltage Optimization methods Laboratories

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Electronic commutator with parallel capacity storage for Switched Reluctance Motor

Electronic commutator with parallel capacity storage for Swi...

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Compatibility in power Electronics (CPE)

作者： V.I. Tkachuk M. Klytta Institute of Power Engineering and Control System National University "Lvivska Polytechnika" Ukraine Faculty of Electrotechnics and Information Technology University of Applied Sciences Giessen-Friedberg Giessen Germany

Switched reluctance motor is simpler and more cost-effective than other small power electrical motors. The paper proposes a new electrical scheme with energy buffer and an average values mathematical model for this kind of motor, which provide a basis for calculation or computation of its characteristics. A computation example of dynamic and static characteristics is presented.

关键词： Commutation Reluctance motors Switches Reluctance machines Rotors Permanent magnet motors Diodes Mathematical model Samarium Magnetic switching

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power Load Modeling Based on Wide-Area Measurements and Support Vector Machine

Power Load Modeling Based on Wide-Area Measurements and Supp...

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

作者： Zhenshu Wang Linchuan Li Li Niu Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China School of Electrical Engineering Shandong University Jinan China State Nuclear Electric Power Design and Research Institute Beijing China

At present, the load modeling is still one of the difficult problems in power system. In this paper, a new method is presented which uses wide-area measurements and support vector machine (SVM) for load modeling. Based on wide-area measurements, this method does non-linear regression analysis on model with SVM. By using radial basis function (RBF), model structure is optimized, and Bayesian Framework is used for identifying parameters, then a kind of non-mechanical model is founded. This method can easily solve the problems in choosing structure and identifying parameters. The founded model has good generalization ability, flexible structure, and rapid calculation speed. In the end, this method has been programmed; the simulation verifies the validity of this model.

关键词： Load modeling Wide area measurements Support vector machines power system modeling power system dynamics power system simulation control system synthesis power system measurements power system analysis computing Bayesian methods

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Optimal placement of Unified power Flow controllers (UPFCs) using Mixed-Integer Non-Linear Programming (MINLP) method

Optimal placement of Unified Power Flow Controllers (UPFCs) ...

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IEEE General Meeting power& Energy Society

作者： F. Aminifar M. Fotuhi-Firuzabad A. Khodaei S. O. Faried Centre of Excellence in Power System Control and Management Electrical Engineering Department Sharif University of Technology Tehran Iran Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Department of Electrical Engineering University of Saskatchewan Saskatoon Canada

Utilization of unified power flow controllers (UPFCs) can be more beneficial in the restructured power systems due to their capabilities in increasing the transmission line capacities as well as shunt reactive compensation. So, these devices should be installed such that the most benefit can be gained. In this paper, the problem of optimal placement of UPFCs is solved using Mixed-Integer Non-Linear Programming (MINLP) method. Hence, the problem is completely formulated based on this method and is solved using available commercial solvers. The salient feature of this method is having potential to simultaneously determine the optimal location of multi UPFCs. Also, since a full AC Optimal power Flow (AC-OPF) is fulfilled during this process, functional parameters of UPFCs and results of OPF are obtained finally. Some case studies are examined to illustrate the effectiveness of the proposed formulation.

关键词： Load flow Optimal control Reactive power Voltage Nonlinear control systems control systems Admittance power systems power transmission lines power system control

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