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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Li, Peng Bai, Qian Zhang, Tianfeng Sun, Wei Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei China Angang Group New Steel CO.LTD Anshan 114015 Liaoning China

ISBN: (纸本)0863412467

UPQC (unified power quality conditioner), which assembles a series voltage compensator;a shunt current compensator and an energy storage device, is the emerging device of custom power. Multiple power quality regulation functions are implemented in UPQC simultaneously. Synthetic compensating functions of UPQC are explained systematically, and a typical topological circuit of UPQC is proposed. For further improvement of the performance of UPQC, APFC (active power factor correction) is introduced to the DC capacitive voltage control for storage unit of UPQC;moreover its working principle is expounded in detail, simulation results are presented to testify the validity of this approach. It is feasible to apply APFC to the storage unit of UPQC, which makes the performance excellent.

关键词： power quality

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A survey on new methodologies and implementation strategies in bulk power system restoration

A survey on new methodologies and implementation strategies ...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Liu, Qiang Zhou, Ming Li, Gengyin Ni, Yixin Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0863412467

The research on the methodologies and implementation strategies in bulk power system restoration after a partial or complete collapse is of great significance. This paper provides the survey on the recent developments of restoration methodologies and implementation strategies. And many new ways to form a power system restoration plan and how to deal with the sub-problems encountered during the restoration process are summarized and introduced. Also, the future work are presented, such as, how to consider the AC/DC hybrid system in the restoration process, how to utilize the distributed generation (DG) and how to use the wide-area measurement system (WAMS) for restoration.

关键词： Restoration

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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...

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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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A Real-Time Data Compression & Reconstruction Method Based on Lifting Scheme

A Real-Time Data Compression & Reconstruction Method Based o...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Chang-you Yan Jian-fei Yang Liu Qi-Xun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

In this paper, a novel real time data compression and reconstruction method is proposed to process a large amount of steady state and transient data of power system. Based on the biorthogonality filters group with the linear wavelet (WT) of lifting scheme and Huffman coding approach, the new algorithm is studied and developed. The field data are used to test the method. The results prove that the method is valid with less data processing time and as high as about 9 times of compression ratio. This method is suitable for the real-time compression of mass data recorded continuously by dynamic monitoring devices of electric power system

关键词： Data compression Reconstruction algorithms Real time systems power system transients Steady-state Nonlinear filters Huffman coding Testing Data processing power system dynamics

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Perturbed trajectory prediction method based on wide area measurement systems

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Dianli Xitong Zidonghua/Automation of Electric power systems 2006年第23期30卷 27-32页

作者： Song, Fangfang Bi, Tianshu Yang, Qixun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China Sifang Research Institute North China Electric Power University Beijing 102206 China

A novel method for perturbed trajectory prediction of post-fault rotor angle is presented in this paper, which is based on phasor measurement unit (PMU) measurements and trigonometric function curve fitting technique. A mathematical relationship of post-fault rotor angle and time is derived from a speed-governing system, which reveals that the perturbed trajectory of the post-fault rotor angle can be expressed by attenuation trigonometric functions. Using curve fitting technique and trigonometric function, a least square method to predict the perturbed trajectory is proposed. Numerical simulations are conducted in IEEE 9-bus system and the simplified north China grid to test the effectiveness of the proposed method. The proposed method can give more reasonable and more promising prediction results as compared with polynomial curve fitting technique.

关键词： Electric power systems

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A Practical Approach for Ride Through of Super Capacitor Energy Storage Based ASD system

A Practical Approach for Ride Through of Super Capacitor Ene...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Zhongdong Yin Minxiao Han Yunlong Du Zheran Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China

A practical ride through scheme bases on super capacitor energy storage system for ASD (adjustable speed drive) equipment is presented in this paper. The topology of ASD discussed adopts AC-DC-AC structure and 12 pulses diode rectifier as input interface. Super capacitor (SC) module connects to inverter DC bus to support DC voltage while power quality problems such as voltage sag or short-term outage take place in power source. A SC energy storage system based 15 kVA ASD prototype was developed. Digital simulation and physical experiments were carried out to verify the correctness and validity of proposed ASD ride through topology and control strategies

关键词： Capacitors Energy storage Variable speed drives Topology Voltage fluctuations Diodes Rectifiers Inverters power quality Prototypes

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power factor and power quality improvement in distribution networks via a novel dynamic reactive compensation equipment

Power factor and power quality improvement in distribution n...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Ji, Hongquan Yang, Yihan Gu, Haibin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Changping District Beijing 102206 China School of Electrical Engineering North China Electric Power University Changping District Beijing 102206 China Power Design and Research Institute Baoding Power Supply Co. Hebei Province Baoding 071051 China

ISBN: (纸本)0863412467

In order to keep the power factor at a high level and maintain acceptable voltage quality in distribution systems, a novel dynamic reactive compensation equipment is proposed. This equipment, which consists of a special regulating autotransformer with a vacuum on-load tap-changer and an intelligent power factor controller (IPFC), adopts step-voltage- regulating control method. It bases on the principle of the capacitor bank's output is in direct ratio with the square of the voltage works on it. In the course of tap- changer switching, the capacitor bank is not cut-out from the power system all along, it is proved in theory that dangerous over-voltage and associated inrush current will not occur. Thus security of the operation on capacitor bank is improved greatly and its natural life will increase much too. Compared with any other dynamic reactive compensation this novel equipment is less expensive and would be more likely to be put to be practical use. In the end, experimental results are given to verify that the proposed equipment has good characteristic of dynamic reactive compensation.

关键词： power quality

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Researches on the Load Representation of Hunan power Grid AC/DC system

Researches on the Load Representation of Hunan Power Grid AC...

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International Conference on power system Technology (powerCON)

作者： Z.y. Liu J. Wen M.x. Han L. Dong H. Ding Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Both static and dynamic electric load characteristics have considerable effect on short circuit ratio (SCR) or effective short circuit ratio (ESCR). This paper gives emphasis on the relationship between static/dynamic load characteristics and SCR (ESCR). Different power level with different power factor is considered for the impacts on SCR or ESCR of static load characteristics. Three-phase short-circuit current of induction motors is qualitative analyzed and simulation of the feeding current is carried out for the dynamic process of induction motor in the consideration of dynamic load characteristics. Case studies are carried out on WEPRI-36 system and Hunan power grid. Simulation results with power system analysis software package (PSASP) illustrates that load should be considered in calculating SCR.

关键词： power grids power system dynamics Thyristors power system simulation Induction motors Analytical models Reactive power Circuit simulation power system analysis computing Software packages

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Study on Secondary Voltage control Based on Multi-agent Particle Swarm Optimization Algorithm

Study on Secondary Voltage Control Based on Multi-agent Part...

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International Conference on power system Technology (powerCON)

作者： Z. W. Jia J. Liu X. M. Xie Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Secondary voltage control system is a significant segment of the hierarchical voltage control in power systems. Though voltage controller has both constant voltage regulators, such as generators and static reactive power compensators, and discrete voltage regulators, such as OLTC and shunt capacitors/reactors, traditional secondary voltage control (SVC) only consider constant voltage regulators. A few of the papers consider discrete voltage regulators, but they are also treated as constant variable. In this paper, Considering the trait of continuous and discrete devices in secondary voltage control co-existing, a mixed secondary voltage control optimal model including continuous and discrete variables is established. The solution is gained by multi-agent particle swarm optimization algorithm. This method concerned with the advantages of multi-agent system and particle swarm optimization algorithm can get every setting value of regulator exactly and quickly. The proposed method is applied to the New England 39 nodes system. It is shown that by contrast to the traditional secondary voltage control, this method can achieve satisfactory controlling effort involved both constant and discrete controllers at the same time.

关键词： Voltage control Particle swarm optimization Regulators power system control power systems power generation Reactive power control Shunt (electrical) Capacitors Inductors

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