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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421-430 订阅

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Sequential Monte Carlo Simulation Based Available Transfer Capability Calculation

Sequential Monte Carlo Simulation Based Available Transfer C...

引用

International Conference on power system Technology (powerCON)

作者： Yajing Gao Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Available transmission capability (ATC) is the transfer capability remaining in physical transmission network for further commercial activity above existing transmission commitments. ATC is an important reference for market participators to make decisions, as well as a judgment for system operators to alleviate transmission congestion, and a reference for system planning and expansion. Most of the existing ATC calculation methods are mainly based on deterministic techniques. In practical power systems, there are large amount of uncertainties, and power system is dynamic and time-varying. A novel approach is proposed to analyze relevant features of ATC and calculate ATC based on sequential Monte Carlo simulation and linear programming considering uncertainties and time variation of the system. Through long-time simulation and analysis, the distribution features of ATC can be obtained. The algorithm based on MATLAB 6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： power system planning power system simulation power system dynamics power system analysis computing Uncertainty Time varying systems Linear programming Analytical models MATLAB system testing

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A novel adaptive scheme of discrimination between internal faults and inrush currents of transformer using mathematical morphology

A novel adaptive scheme of discrimination between internal f...

引用

IEEE General Meeting power& Energy Society

作者： Ma Jing Xu Yan Wang Zengping Liu Haofang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

This paper addresses a new relaying scheme for identifying the inrush current and short circuit current caused by internal fault on the basis of sudden changes detection using novel morphological gradient (NMG), transient current signals are then extracted by use of morphological opening and closing transform. Based on different characteristics of transient signals between the short circuit current and the inrush current, the transformer protection method is proposed. This method can avoid the symmetrical inrush current and saturation of current transformer (CTs). The results of Electrical power dynamic laboratory (EPDL) indicate that the proposed technique can also deal with the sampled data contaminated with various kinds of noises and DC components and is stable during internal faults with external shunt capacitance in a long EHV transmission line

关键词： Morphology Circuit faults Surge protection Current transformers Short circuit currents power system transients Relays Fault diagnosis Electrical fault detection Fault detection

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Study on Conjectural Variation Based Bidding Strategy in Spinning Reserve Markets

Study on Conjectural Variation Based Bidding Strategy in Spi...

引用

International Conference on power system Technology (powerCON)

作者： Xudong Jia Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

In this paper, a novel model of opportunity cost of spinning reserve capacity is proposed based on sequential dispatching. A model of strategic behaviors of generation firms based on conjectural variation is proposed to apply in monopoly spinning reserve capacity markets with incomplete information. According to the conjectural variation model, each firm rationally maximizes its profits while considering reactions of their competitors. The advantage of this method over others is that it is a real reflection of actual power markets without the need to know all firms' actual costs. Examples are used to illustrate that the proposed model is logical and practical.

关键词： Spinning Costs Dispatching Monopoly power markets power generation Educational programs power system simulation Reflection monitoring

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Modeling of VSC-HVDC and control strategies for supplying both active and passive systems

Modeling of VSC-HVDC and control strategies for supplying bo...

引用

IEEE General Meeting power& Energy Society

作者： Gengyin Li Ming Yin Ming Zhou Chenyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

An equivalent continuous-time state-space model for VSC-HVDC in the synchronous dq reference frame has been established in the paper. Based on the model, relevant control strategies have been developed for the cases of supplying active and passive systems. The multi-input multi-output (MIMO) control schemes are emphasized in designing power controller and voltage controller. The scheme features feed forward compensation to decouple the d- and q-axis of the voltage source converter (VSC) model, which ensures the independent control of active and reactive power, DC voltage and reactive power as well. Simulations have been performed on PSCAD/EMTDC, a visual design environment for power system studies. The validity of the mathematic model and the feasibility of the control strategies have been proved by the simulation results

关键词： power system modeling Voltage control Converters power conversion power system simulation Reactive power control PSCAD MIMO Feeds EMTDC

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Optimal Allocation of Electromagnetic Pollution Emission Rights in power Quality Markets

Optimal Allocation of Electromagnetic Pollution Emission Rig...

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International Conference on power system Technology (powerCON)

作者： Xiaodong Yang Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

power quality (PQ) is an issue that is becoming increasingly important to electricity consumption. How to design a market mechanism for power quality exchange becomes acute more and more. Due to its systematic property, a managed power quality market (PQM) should be organized. In this paper, a novel competing model involving two-price bidding of demand side and marginal cost bidding of supply side is presented to optimize the allocation of emission right (ER) among the consumers in a managed PQM. The uniform price for the basic emission capacity can help to reduce the risks in markets, and the ultimate allocation can maximize the total system utility because the trading between suppliers and consumers occurs at the point of market equilibrium. An example is given to illustrate the rationality and feasibility of the proposed model.

关键词： Pollution power quality power system management Energy consumption Energy management Load management Quality management power system modeling Cost function Erbium

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Active-reactive power compensation based on SCES in distribution system

Active-reactive power compensation based on SCES in distribu...

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International Conference on power system Technology (powerCON)

作者： Rong Lu Jiancheng Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A Super Capacitor Energy Storage (SCES) system applied to distributed generation system and distribution network is presented. Application studies of the SCES system for active power supply, voltage control and harmonic elimination are described. With inverter control, both active and reactive power pumped into the utility grid can be controlled. The proposed approach combines a dual-loop voltage and current control and a power control which does not require knowledge of the equivalent impedance of the utility grid the SCES unit is connected to. Furthermore, the proposed power control has superiorities as strong P and Q regulation capability, fast enough response, and purely sinusoidal line current. Finally, experiments are performed to verify the proposed theory which shows its well performances.

关键词： power control Capacitors Energy storage Distributed control power supplies Voltage control power system harmonics Inverters Reactive power control Current control

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Research on dynamic characteristics of VSC-HVDC system

Research on dynamic characteristics of VSC-HVDC system

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IEEE General Meeting power& Energy Society

作者： Guangkai Li Gengyin Li Haifeng Liang Chengyong Zhao Ming Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

VSC-HVDC technology based on voltage source converter (VSC) and isolated gate bipolar transistor is a kind of novel HVDC technology for low power and long distance with flexible control and operation modes. In this paper, the dynamic mathematic model of VSC-HVDC with SPWM control is founded based on analyzing the fundamental principle of VSC-HVDC system. Its switch characteristic and dynamic operation mechanism are analyzed. Simulation results of dynamic operation characteristics for VSC-HVDC system with a rapid power change or a short time fault show that the theoretical analysis is correct. This is a basement to do more dynamic analysis for VSC-HVDC

关键词： Converters power conversion Isolation technology Switches Bipolar transistors HVDC transmission Voltage control Mathematics Mathematical model power system modeling

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The structure and application of flexible SCADA

The structure and application of flexible SCADA

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IEEE General Meeting power& Energy Society

作者： Yang Haijing Yang Yihan Zhang Dongying Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China

This paper put forward to an interactive flexible SCADA system in which information shared, on the basis of analyzing and summarizing the defections of former SCADA. It not only solves the interaction of data and function in the information islands, but also solves functions coordination and data exchange of distributed application system in different location. The paper proposes the concept of general data acquisition, discusses the structure and the ways of technology support, and describes the application of flexible SCADA based on the example of fault decision support system (FDSS). This proposal flexible SCADA extends and develops the data source of traditional SCADA and enriches the data foundation for power system advanced analysis software

关键词： power grids SCADA systems Dispatching Application software power system management Management information systems Medical services Management training power system protection Decision support systems

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The intelligent research of image recognition used for unattended substation

The intelligent research of image recognition used for unatt...

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Yang, Jun Ai, Xin Jia, Xiufang Li, Yansong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Deshengmenwaizhuxinzhuang Beijing 102206 China Electric Power Company Jinzhou Engineering Technology Department Liaohe Petroleum Exploration Bureau Liaoning Province Linghai 121209 China

ISBN: (纸本)0863416381

It is a trend to construct unattended substation in power system *** paper systematically analyses the superiority and limitation of MATLAB and Visual C++ and illustrates how to compile m-files to cpp-files by MATLAB engines and integrate cpp-files code into existing C++ projects by Visual C++ to realize intelligent function on image recognition used for unattended *** intelligent function can effectively test illegal intrusion and fires through the detection and recognition of moving goals by three-image difference method and self-adapting threshold value segmentation algorithm and detect situations of disconnection link by use of image crop and image index processing and give warnings to alarm system. Because of lacking of brightness of image or nonlinear brightness and being influenced by kinds of noise,this paper determines to adopt contrast enhanced algorithm and high-frequency enhanced algorithm to repair grey-scale distribution and uses median filtering to remove noise of image. In the end,this paper brings forward the expectation about the image recognition of the unattended substation. When non-uniform of image illumination distribution, grey-scale of background changes largely and image segmentation has not the fittest threshold, so the paper uses self-adapting threshold segmentation algorithm to gain the image segmentation.

关键词： Image segmentation

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Study on control Strategies to Improve the Stability of Multi-Infeed HVDC systems Applying VSC-HVDC

Study on Control Strategies to Improve the Stability of Mult...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Chengyong Zhao Ying Sun Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control under Ministryof Education North China Electric Power University Baoding Hebei China

Against the stability of the multi-infeed HVDC (MIDC) transmission system, voltage source converter based HVDC (VSC-HVDC) is applied to MIDC systems. The new systems can reduce probability of commutation failure and improve the stability of the MIDC systems. A physical model of a multi-infeed HVDC and VSC-HVDC system is developed, and its mathematical model is analyzed. The rectangular coordinate form of VSC's power transmission equations is deduced through coordinate conversion. Based on the inverse system method for multivariable nonlinear control, the nonlinear controllers of the multi-infeed HVDC and VSC-HVDC system are designed. Simulation results by PSCAD/EMTDC show that the designed nonlinear controllers improve effectively the voltage stability of the multi-infeed HVDC and VSC-HVDC system under small or large disturbances, such as short circuit fault, reduce the probability of commutation failure in the inverter of HVDC systems and increase the operation reliability of HVDC systems

关键词： control systems Stability HVDC transmission Converters power conversion Nonlinear control systems Mathematical model Voltage power system modeling power transmission

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