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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Monitoring and Control"

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Multi-layer Disturbance Processing system based on Multiple Information Sources

Multi-layer Disturbance Processing System based on Multiple ...

引用

IEEE General Meeting power& Energy Society

作者： Tianshu Bi Qian Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

More and more IEDs have been commissioned in power systems, such as digital relays, PMUs, metering and control devices, fault recorders and so on. Once there is a disturbance (for example, fault, low-frequency oscillation, etc.), large amount of information will pour into the control center. Therefore, how to identify the disturbance and then take corresponding countermeasures is crucial for power system security and reliability. A multi-layer disturbance processing system based on multiple information sources is proposed in this paper. Firstly, the characteristics of different kinds of information sources, including PMUs, RTUs, digital relays and fault recorders, are analyzed. Secondly, according to the arrival times of the information, the framework and functions of multi-layer fault diagnosis system is presented in detail. After a disturbance occurs, the suggested system could realize disturbance identification, fault element diagnosis and detailed post-fault analysis in succession at different time frames with the information coming, which fits the needs of operators well.

关键词： Fault diagnosis Digital relays Phasor measurement units power system reliability Information analysis power system faults power system relaying power system control power systems control systems

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Research on identifiability of equivalent motor in composite load model

Research on identifiability of equivalent motor in composite...

引用

2007 IEEE Lausanne powerTECH

作者： Ma, Jin Han, Dong He, Renmu Dong, Zhaoyang Hill, David J. IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China School of Information Technology and the Electrical Engineering University of Queensland St. Lucia QLD 4072 Australia Department of Information Engineering Australian National University

ISBN: (纸本)9781424421909

Load modeling is very important for power system dynamic analysis and control. The composite load model widely applied recently in the power system operation centre consists of the static load and the equivalent motor. Current practices in measurement-based load modeling identify all the parameters in this composite load model. However, it is not clear whether all these parameters could be identified from the measurements. This paper investigates the identifiability of the equivalent motor parameters in the composite load model. Trajectory sensitivity approach is applied first to find the motor parameters that have great effects on the measured active as well as reactive load dynamics. The analysis results show that the motor outputs have various sensitivities with respect to the parameters. Since the voltage disturbance, the active load and the reactive load dynamics are applied to identify the motor parameters, those parameters affecting the measurements to a great extent are observable, thus identifiable from the measurements;while those that have little effects on the motor outputs are unobservable from the measurements and consequently unidentifiable. The case studies verify the identifiability of the motor parameters. ©2007 IEEE.

关键词： Parameter estimation

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Research on PT Ferromagnetic Resonance Region and the controllable Damping

Research on PT Ferromagnetic Resonance Region and the Contro...

引用

power Tech Conference

作者： L. X. Zhou Z. D. Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

In the neutral ungrounded system, potential transformer (PT) ferro-magnetic resonance is a kind of interior overvoltage which is frequently appears and creates most of the accidents. Whether the elimination measures are reasonable and effective or not affects the security and stability of the power system directly. Fundamental research has been done on the resonance region changeable situation and the characteristics of each resonance region under different system parameter and PT saturation characteristics. According to the occurring principle of PT ferromagnetic resonance and the characteristics, a novel effective controllable damping device is designed, which will change the correlative parameter that lead to resonance to make the circuit parameter of the system get out of the resonance area to eliminate the resonance. The accuracy of the fundamental analysis and the effectiveness of the elimination measure have been verified by the digital simulation based on EMTDC/PSCAD and by the high voltage propotype experiment.

关键词： Magnetic resonance Damping power system security power system stability PSCAD Voltage transformers Voltage control Accidents power measurement power system measurements

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A Mathematic Model and its Iterative Algorithm on Obtaining Optimal Capacity of P-S Station

A Mathematic Model and its Iterative Algorithm on Obtaining ...

引用

2007 International power Engineering Conference (IPEC2007), vol.1

作者： Fang Cao Li-zi Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

With rising electricity loading in developing country, measuring capacity of pumped-storage station (P-S station) is becoming more critical. This paper tries to establish mathematic model on obtaining capacity of P-S station for maximum cost sayings. The paper first deducts the relationship between capacity of P-S station, peak load and the vale load by simulating cost curve of thermoelectric unit, and then deducts the formula for calculating optimal capacity of P-S station. Based upon these findings and the load curve, the paper then develops the curve to describe the relationship between volume of generated electricity and capacity of the P-S station and provides the solution for obtaining optimal capacity of the P-S station. Finally, the paper discusses the impact of selecting initial solution or certain iterative solution on iterative speed and suggests the direction for further research.

关键词： Iterative methods Optimization methods Pumped storage power generation

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Hybrid Non-linear State Estimation with Voltage Phasor Measurements

Hybrid Non-linear State Estimation with Voltage Phasor Measu...

引用

IEEE General Meeting power& Energy Society

作者： Xiaohui Qin Tianshu Bi Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

In this paper, a new method of hybrid non-linear state estimation with PMU is proposed. Firstly, the voltage phasor measurements are transformed into indirect equivalent branch current measurements, with which the conventional state estimator takes the impact of PMU into consideration. Secondly, the indirect measurement errors caused by the measurement transforming are analyzed and calculated in detail. Thirdly, the accuracy of hybrid estimator is analyzed in the paper. The simulation results show that the proposed method improves the accuracy of estimator and the convergence speed also.

关键词： State estimation Voltage measurement Phasor measurement units Current measurement Fluid flow measurement Jacobian matrices power measurement Bismuth power system simulation Hybrid power systems

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Phase-to-Phase Distance Relay Based on the Measured Impedance Trajectory

Phase-to-Phase Distance Relay Based on the Measured Impedanc...

引用

IEEE General Meeting power& Energy Society

作者： Huanzhang Liu Qiankuan Liu Shaofeng Huang Qixun Yang Huazhong Electric Power Dispatch and Communication Center Wuhan China 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 under Ministry of Education North China Electric Power University Beijing China

The measured impedance trajectory changing with fault resistance during multi-phase faults and the reasons that fault resistance may cause unwanted impedance relay operations in two-source systems were analyzed in this paper. To improve the impedance relay adaptive ability and reliability during three phase fault, a combined phase-to-phase impedance relay based on the measured impedance trajectory was presented. The relay is composed of three criteria respectively called the reactance line based on the measured impedance trajectory, the sending end and the receiving end directional lines, whose transient and steady state operating characteristics have been analyzed for forward and reverse faults. The simulation test was made by RTDS on a 340 km long 750 kV line in a two-source system. Theoretical analysis and dynamic simulation test results show that the adaptive relay can respond to three phase faults and phase-to-phase faults, and has satisfactory performances.

关键词： Protective relaying Impedance measurement Phase measurement Relays Electrical resistance measurement Transient analysis Steady-state system testing Performance analysis Analytical models

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Research on energy efficiency of supercapacitor energy storage system

Research on energy efficiency of supercapacitor energy stora...

引用

2006 International Conference on power system Technology, powerCON2006

作者： Yun, Zhong Jiancheng, Zhang Gengyin, Li Aiguo, Liu Department of Electrical Power Engineering North China Electric Power University Baoding. Hebei 071003 China School of Information Engineering Nanchang University Nanchang Jiangxi 330029 China 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

ISBN: (纸本)1424401119

Recent developments in the field of supercapacitors have led to the achievement of high specific energy and high specific power devices which are suitable for energy storage in high power electronic applications, especially in the field of management of embarked electrical power. Equivalent serial resistance is put forward to estimate energy efficiency. Reducing the equivalent series resistance in a supercapacitor will gain a great appreciation. A supercapacitor energy storage system (SCESS) is also designed in this paper 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. This SCESS installed capacity is 0.235MJ;peak power is 5OkW;and generating efficiency is up to 97.94%. © 2006 IEEE.

关键词： Energy efficiency

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The propagation characteristics of electromagnetic wave generated from partial discharges in power transformer by FDTD simulation

The propagation characteristics of electromagnetic wave gene...

引用

2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP

作者： Tang, Zhiguo Li, Chengrong Wang, Wei Wang, Hui Wang, Li Ding, Yansheng Beijing Key Laboratory of High Voltage and EMC Ministry of Education North China Electric Power University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University State Grid Corporation of China 100081 Beijing China Beijing Key Laboratory of High Voltage and EMC School of Electric and Electronic Engineering North China Electric Power University P.O. No.88 Beijing 102206 China

The radiation and propagation of electromagnetic (EM) waves generated from PD caused by the obstruction of main transformer components are studied by FDTD simulation in order to get more information for PD location and diagnosis. Current filament, perfect conductive cylinder and perfect conductive spiral coil models are used to simulate the radiation and the influences of iron-core and transformer coil to the propagation of EM *** results demonstrate dynamic propagation process of EM waves in time order, and prove the correctness of the shortest optical path principle. But the attenuation and distortion of EM waves-especially the first peak amplitude-caused by the obstruction of large solid conductive obstacle like iron-core are quite intensive that it may cause great difficulties to identify exact arriving time position of incident waves coming along the shortest optical path. While the influences of the coil to the propagation of EM waves are so little that HF EM waves can penetrate it in almost linear path. ©2007 IEEE.

关键词： Electromagnetic waves

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Measurement-based load modeling using genetic algorithms

Measurement-based load modeling using genetic algorithms

引用

2007 IEEE Congress on Evolutionary Computation, CEC 2007

作者： Ma, Jin Dong, Zhao-Yang He, Ren-Mu Hill, David J. IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education 102206 Beijing China School of Information Technology and Electrical Engineering University of Queensland St. Lucia QLD 4072 Australia Department of Information Engineering Australian National University Australia

ISBN: (纸本)1424413400

Load modeling is very important to power system operation and control. Measurement-based load modeling has been widely practiced in recent years. Mathematically, measurement-based load modeling problem are closely related to the parameter identification area. Consequently, an efficient optimization method is needed to derive the load model parameters based on the feedback of estimation errors between the measurements and model outputs. This paper reports our work on applying genetic algorithms on measurement-based load modeling research. Due to its robustness to the initial guesses on the load model parameters, genetic algorithms are very suitable for load model parameter identification. Two cases including both the real measurement in a power station and the digital simulation are studied in the paper. For comparison purpose, the classical nonlinear least square estimation method is also applied to find the load model parameters. The simulated outputs from the load model confirm the efficiency of genetic algorithms in measurement-based load modeling analysis. Future work will focus on fastening the converging speed of the genetic algorithms, and/or utilizing more efficient evolutionary computation methods. © 2007 IEEE.

关键词： Electric load management

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IEEE Women in Engineering Magazine 2007年第1期1卷 16-17页

作者： Leslie Prives Key Laboratoty of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei Province China

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