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检索条件"机构=Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control"

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Research on Super Capacitor Energy Storage system for Power Network

Research on Super Capacitor Energy Storage System for Power ...

引用

International Conference on Power Electronics and Drive systems (PEDS)

作者： 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, which is mainly composed of three parts: the electrical double-layer capacitors array that stores energy, the AC/DC-DC/AC power converter system and the integrated control system composed of microprocessors. Application studies of the SCES system for active power supply, voltage control, voltage oscillation elimination and harmonic elimination are described. The stability and control effect of the system relation to the node impedance are analyzed in detail. This paper also presents studies on experiments of the SCES system synchronous and re-synchronous operating with power network when grid fault and recovered.

关键词： Capacitors Energy storage Supercapacitors Distributed control DC-DC power converters Centralized control Microprocessors Power supplies Voltage control Power system harmonics

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Condition-Based Maintenance of Electrical Equipments Based on 1D3 Algorithm and Monte Carlo Stimulation

Condition-Based Maintenance of Electrical Equipments Based o...

引用

IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Li Ran Chen Li Gu Xueping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Condition-based maintenance is an advanced maintenance strategy which is based on the monitoring of equipments status and according to the results of monitoring and analysis people can arrange maintenance scientifically. When monitoring and analyzing the status of equipments, there are vast historical and on-line data to analyze. If we can find the main factors leading to equipment failure through analyzing the data and pay more attention to these factors, we can make maintenance decision more exactly and quickly. In this paper we propose to apply ID3 algorithm to classify the data according to the importance of their influence to equipment failure and then find the factors which influence equipments most. After finding the most important factors, apply Monte Carlo simulation to forecast the probability of equipment failure which occurs in their operational life span, and according to this we can pay more attention to monitor the factors which result in failure easily

关键词： Monte Carlo methods Condition monitoring Maintenance Equipment failure Data analysis Data mining Algorithm design and analysis Failure analysis Power system reliability Time series analysis

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Decomposition on Pollution Current of Load Emitting and Analysis of Its Influence on Power Price

Decomposition on Pollution Current of Load Emitting and Anal...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Xiufang Jia Chengyong Zhao J. Suo 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

Along with the increment of disturbing loads in the power system, the effect on network that is brought by the power quality problems, become increasingly serious. Based on the market bargaining principles, the power price should be affected by the disturbance of loads. However current power price system fails to reflect the factor. Evaluation of load's disturbing property and analysis of its influence to power price is performed in this paper. The load current can be decomposed into three parts: instantaneous active current, instantaneous fundamental reactive current and instantaneous distorted current by the generalized instantaneous reactive power theory in dq0 coordinate system. The reactive current emission factor reflecting pure resistance of load and distorted current emission factor reflecting load's linearity are defined. According to these two factors, the evaluation method of the effect of the disturbing load on the power price based on allocating compensation equipment's cost is presented. The method provides some basis for contract's subscribing in the future. The calculated example shows the feasibility of above method, as well the degree of the influence of the disturbing load upon the power price

关键词： Pollution Power quality Reactive power Power system harmonics Costs Nonlinear distortion Educational programs Voltage Power system analysis computing Performance analysis

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The similitude power detection on single-phase-to-ground fault in the non-solidly grounded system

The similitude power detection on single-phase-to-ground fau...

引用

IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Chengyong Zhao Yanfen Guo 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

Detecting single-phase-to-ground fault is a difficult and challenging problem in the non-solidly grounded system that includes neutral point ungrounded, neutral point high-resistance grounded and neutral point compensated extinction coil grounded system. It is important to identify the faulted line quickly and exactly to reduce the time and effort necessary to locate and remove the fault, so that the probability of a second ground fault with its destructive currents can be reduced significantly. Based on analyzing the characteristics of the existing methods about identifying the faulted line in the non-solidly grounded system, the characteristics of the lines' zero-sequence current and the system's zero-sequence voltage and the relationship between every line's zero-sequence current and the system's zero-sequence voltage are analyzed deeply and a new method using similitude power to determine the faulted line is presented. The method can be applied to neutral point ungrounded system and neutral point ineffective grounded system to determine the faulted line accurately when resistance ground faults occur. Various ground faults under different conditions are simulated using MATLAB. The results show the method is feasible and effective

关键词： Fault detection Circuit faults Fault diagnosis Power system faults Power system security Power system transients Voltage Power system protection Power system harmonics Coils

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New Mitigating Measures against Core Saturation by Series of Additional Grounding Resistance from the Point of View of Network Configuration

New Mitigating Measures against Core Saturation by Series of...

引用

IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yulong Ma Xiangning Xiao Xu Jiang Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

High current of HVDC grounding electrode will induce a high potential in the nearby substation ground grid if the soil resistivity is high. Once there are potential differences among the ground grids, direct current will flow through the neutral grounded transformer. If the direct current through transformer winding is high enough core saturation will occur. The paper presented a method of series of additional resistance between the transformer neutral point and ground grid from the point of view of network configuration. A novel optimized algorithm is adopted in order to calculate the grounding resistance. Method presented in the paper is tested with China South Grid data. Results show that current through transformer neutral point can be reduced greatly and thus core saturation can be avoided

关键词： Electrical resistance measurement Grounding Circuit faults Transformer cores Soil measurements HVDC transmission Electrodes Substations Conductivity Windings

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Study on the Influence of TCSC on Fault Component Distance protection

Study on the Influence of TCSC on Fault Component Distance P...

引用

IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

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

Based on the characteristics of TCSC, the influence of TCSC on fault component distance protection is analyzed. With the new setting resistance to be Z Zd -jX C , the action of fault component distance protection on the line equipped with TCSC is presented. It is concluded that the fault component distance protection will not act incorrectly, but the range of protection will be reduced, especially when the TCSC is bypassed

关键词： Power capacitors Thyristors Impedance Power system protection Protective relaying Power system stability Circuit faults Inductance Power transmission lines Power system dynamics

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Research on Flywheel Energy Storage system Using in Power Network

Research on Flywheel Energy Storage System Using in Power Ne...

引用

International Conference on Power Electronics and Drive systems (PEDS)

作者： 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

The flywheel energy storage (FES) system presented in this paper is composed of four parts: the flywheel, the bearing, the motor/generator and the power converter. The control methods and strategy of the FES system in power network are introduced in detail. During the storage period and generating times, the waveform of the power converter output currents is controlled to be sinusoidal by using sinusoidal pulse width modulation (SPWM) control method, so the efficiency of the energy conversion is high and the torque ripple of the motor/generator is minimized. The control methods of starting and operating large moment of inertia of the flywheel are simulated and studied for the power converter. The latest experimental results of the FES system are introduced, and the control validity is verified through these results.

关键词： Flywheels Energy storage Power generation Pulse width modulation converters control systems Pulse generation Torque control Torque converters Pulse width modulation Energy conversion

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The research of electric appliance running status detecting based on DSP

The research of electric appliance running status detecting ...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Li, Baoshu Quan, Chao Zhao, Shutao Tong, Weiguo Tao, Peng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003Hebei Province China Electrical Engineering Department North China Electric Power University Baoding 071003 China North China Electric Power University Baoding 071003 China

ISBN: (纸本)0780391144

A new load detection method was presented based on its running status of Power system. The loads are sorted according to their index of capacitive, inductive, and none-linear. The static character of each load was got according to the time-distribution. The concept of load detection is completed. The data-sample and wave recording equipment is designed and assembled based on the DSP for power loads status detecting. The superior software was designed for data management and analyzing. The recognizing status data was analyzed in both time-domain and frequency-domain;the identifying method for electric power loads status is deduced based on the correlation coefficient;the mathematical model for the status identifying is built;the trueness and validity of the methods is verified based on the testing and analyzing. © 2005 IEEE.

关键词： Electric power systems

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Research on remote meter automatic reading based on computer vision

Research on remote meter automatic reading based on computer...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Zhao, Shutao Li, Baoshu Yuan, Jinsha Cui, Guiyan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Electrical Communication Department North China Electric Power University Baoding 071003 China North China Electric Power University Baoding 071003 China

ISBN: (纸本)0780391144

A novel method is put forward, which the power meter can be read based on compute vision, and the architecture of remote meter auto reading system is designed. Different with the normal automatic meter reading system that must obtain the value from digital communication interface, the new method recognizes the meter reading utilizing the computer vision technique, it is a kind of non-contact measurement. In the meter automatic reading, the computer vision discrimination, incorporate human's ability of visual and apprehensive models. Not only the digital display power meter can be read, but also the direct-reading instrument can be fetched In this paper, the scheme of remote automatic reading is introduced, the local meter reading information of distributed substation can be transmitted to center using computer network. And then the pretreatment, segmentation and pattern matching, are detailed description in the meter image recognition process. Via energy meter automatic recognition experiment, the results based computer vision is accurate enough to monitor the remote substation running parameters. © 12005 IEEE.

关键词： Computer vision

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A novel harmonics injecting approach on over saturation suppression of DVR series injection transformer

A novel harmonics injecting approach on over saturation supp...

引用

International Power Engineering Conference (IPEC)

作者： Zhongdong Yin Lixia Zhou Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education. North China Electric Power University China

ISBN: (纸本)9810557027

Voltage problems can be effectively solved by series compensators coupled with series injection transformers. However, the magnetic flux in iron core of series transformer may change in a large range depending on the close angle of injecting voltage, at the same time iron core easily get over saturated. Over saturation in transformer iron core leads to produce large field inrush current and distortion on compensating voltage wave, bring about hazard to operation of transformer and inverter, also increase the possibility of relay mishandling and finally decrease reliability of power supply. This paper analyzes the over saturation mechanism of series injection transformer and presents a novel harmonics injection control approach to suppress. The validity of proposed approach is verified by calculation and simulation

关键词： Circuit faults Iron Transformer cores Magnetic cores Magnetic flux Surges Hazards Inverters Relays Power supplies

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