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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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Condition-based maintenance of electrical equipments based on ID3 algorithm and Monte Carlo stimulation

Condition-based maintenance of electrical equipments based o...

引用

2005 IEEE/PES Transmission and DistributionConference 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 Ministry of Education North China Electric PowerPower University Baoding 071003 Hebei Province China Department of Electrical Engineering North China Electric Power University North China Electric Power University

ISBN: (纸本)0780391144

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. © 2005 IEEE.

关键词： Electric equipment

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Monte Carlo simulation based available transmission capability calculation

Monte Carlo simulation based available transmission capabili...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Gao, Yajing Zhou, Ming Li, Gengyin Huang, Yuekui Xiao, Limin Li, Rui IEEE Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Hebei Electric Power Company Shijiazhuang 050021 Hebei Province China

ISBN: (纸本)0780391144

With the further development of power markets, large amount of electric power wheeling and frequent transmission transaction is emerging, accurately determining Available Transmission Capability (ATC) and broadcasting the ATC information in time are very important to prevent and relieve transmission congestion effectively. In practical power markets, there are large amount of uncertainties involved in Transmission Reliability Margin (TRM) and Capacity Benefit Margin (CBM) of ATC. Considering calculation accuracy and time, a novel approach is proposed to calculate ATC based on Monte Carlo simulation and sensitivity analysis considering large amount of uncertainties impacting the value of ATC. The steady state constraints and voltage stability and transient stability constraints are taken into account. The iterative solution based on PSASP by China EPRI is developed. IEEE 14-bus test system is used to verify the presented approach. The results show that the model and algorithm is correct and effective. The research achievements are undergoing to transfer to the application in certain provincial power system in China, and some new problems are suggested in the end of paper. © 2005 IEEE.

关键词： Power transmission

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A Novel Structure of dynamic Reactive Power Source

A Novel Structure of Dynamic Reactive Power Source

引用

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

作者： Zhongdong Yin Jianhua Zhang Xiangning Xiao Zhengpai Cui Yunbo Long Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China

This paper puts forward a novel topology of controllable reactor, the structure is based on many small capacity thyristor controlled reactor (TCR) modules and a three-windings transformer connecting to system. The transformer secondary adopts duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is very small. It not only possesses all the functions a traditional TCR has, but also has many other merits such as occupying small floor space, generating little loss, easy implement control and protection scheme, and high reliability etc. A 500 kVar industrial prototype is under construction in Langfang, Hebei province of ***. Digital simulation based on EMTDC/PSCAD and field test were carried out to verify the perfect harmonics characteristics of topology proposed

关键词： Reactive power Topology Power system harmonics control systems Inductors Power system protection Power system reliability PSCAD Thyristors Joining processes

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Iterative Prony Method Based Power system Low Frequency Oscillation Mode Analysis and PSS Design

Iterative Prony Method Based Power System Low Frequency Osci...

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

作者： Hu Guoqiang He Renmu Yang Huachun Wang Peng Ma Rui Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper presents an identification method based on the iterative Prony to identify transfer function and configure PSS parameters using residue way. The iterative Prony is a very useful method to acquire power system oscillation modes, by which the system eigenvalue, oscillation frequency, amplitude, damping and relative phase can be directly estimated using the response of given input signals. Considering the influence of input signal on output signal, the iterative Prony can acquire the transfer function of power system, then, according to the corresponding residues we conducted coordinated setting of power system stabilizer (PSS) by residue method. The simulation results for two testing system examples prove that this proposal method is effective in the power system oscillation mode analysis and parameters determination of PSS, can improve eigenvalues of system and can enhance system damping after PSSs whose parameters are optimized by above method are built into power system

关键词： Iterative methods Power system analysis computing Power system simulation Transfer functions Eigenvalues and eigenfunctions Frequency estimation Damping Amplitude estimation Phase estimation Analytical models

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A statistical method of improving the resolution of time-delay of UHF signals for PD location in transformers

A statistical method of improving the resolution of time-del...

引用

Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Zhiguo Tang Chengrong Li Xu Cheng Wei Wang Jun Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

It's important to make an accurate PD location in transformers for fault diagnosis and maintenances of power systems. Theoretically it's possible to locate the PD source by measuring the differences in the arrival time at the UHF sensor array. The propagation velocity of EM wave in air is 30 cm/ns, which is extremely fast, so the resolution of the time-delay of UHF signals detected at the UHF sensor array is one of the key points to make an accurate PD location. Here, we propose a mathematical method: cross-correlation-shifting-averaging algorithm that can improve the resolution of the UHF signal's time-delay by increasing the signal to noise ratio and reducing the time dispersion caused by the random nature of PD. The practical processing results of experimental data from our laboratory indicate that the method can increase the time-delay resolution by nano-seconds in some cases, which improve PD location accuracy by tens of centimeters.

关键词： Statistical analysis Signal resolution Transformers Sensor arrays Microwave antenna arrays Fault diagnosis Power system faults Power system measurements Time measurement UHF measurements

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The fault diagnosis layer model of electric power grid based on weighted mean roughness

The fault diagnosis layer model of electric power grid based...

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

作者： Li Ran Ix Li Jinghua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education China Electric Power University Baoding Hebei China

Based on rough set, this paper use discernibility matrix to reduce the condition attributes. The reduced samples are laid by weighted mean roughness to avoid blindness and redundancy. By this method, model space can be compressed greatly and weighted mean roughness is easy to calculate. Weighted mean roughness is used to separate attributes' priority in every lay, which make the diagnosis system had strong tolerant ability. When the electric power grid is fault, the result of diagnosis will be correct by searching every lay with priority level. The correctness and effectiveness are validated by the analysis result of emulation

关键词： Fault diagnosis Power systems Fault tolerance Redundancy Blindness Power system modeling Emulation Power grids Rough sets Power system reliability

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Research on DC Bias Due to Magnetic Storm and DC Transmission

Research on DC Bias Due to Magnetic Storm and DC Transmissio...

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

作者： Weiping Shi Lianguang Liu Qian Wang Zongqi Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper focuses on the research on the DC bias due to magnetic storm and HVDC. In the paper, we introduce the DC bias problem of Jiangsu Yang-Huai transmit electric system and Southern Power Grids, discuss the harmful effect of the transformer DC bias and the significance of research, and analyze the compensation, weakening and elimination of transformer bias current. Finally, the problems that should be paid attention to and some corresponding suggestions are proposed

关键词： Storms Power grids Substations HVDC transmission Grounding Power transmission lines Electrodes Magnetic analysis system testing Power generation

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Parallel operation of hybrid active power filter with passive power filter or capacitors

Parallel operation of hybrid active power filter with passiv...

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

作者： Yonghai Xu Xiangning Xiao Hao Liu Hong Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

Harmonic pollution and reactive power compensation are the important power quality problems. This paper proposes a combined power filter system consisting of the parallel operation of a hybrid active power filter (HAPF) and the passive power filters or capacitors. The HAPF is formed by a single tuned LC filter per phase and a small-rated three-phase active filter, which are directly connected in series. The characteristics of the combined system and the harmonic current detection method using the combination of load current and the mains current are analyzed and simulated. The simulation results show that good filter performance can be obtained by the combined system. Experimental results from a 100 kVA/380 V hardware prototype parallel operation with capacitors are presented to conform the validity and effectiveness of the combined system

关键词： Active filters Power filters Power capacitors Power harmonic filters Power system harmonics Pollution Reactive power Power quality Harmonic analysis Analytical models

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Multiobjective Optimization Scheduling Based on Fuzzy Genetic Algorithm in Cascaded Hydroelectric Stations

Multiobjective Optimization Scheduling Based on Fuzzy Geneti...

引用

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

作者： Hu Guoqiang He Renmu Ma Rui Wang Peng Yang Huachun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

The multi-objective fuzzy optimal method based on the fuzzified optimal solutions of single objectives need not list all non-inferior solution sets, which can optimize directly objectives in value area of variables. This method can reflect the interrelation between individual objective optimal solutions and multi-objective optimal solution. On the basis of fundamental principle of multi-objective fuzzy optimization and genetic algorithm, combing with the concept of objective relative subject degree, this paper presents a multi-objective optimization approach for the hydroelectric power system with contradictory objectives. The proposal method considers the satisfied degree of various characters and contradictory objectives and seeks an appropriate optimized solution to make each objective optimal as possible considering each objective comprehensively. The simulation results of example show that the fuzzy genetic algorithm is an effective method for multi-objective optimization problem in the cascaded hydroelectric plants

关键词： Genetic algorithms Optimization methods Power system dynamics Laboratories Power system protection Power system security monitoring Fuzzy systems control systems Fuzzy set theory

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Study on the Reduction of Identified Parameters of the Power Load's Aggregated Motor Model with the Aim of Sustaining Its Representability

Study on the Reduction of Identified Parameters of the Power...

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

作者： Wang Peng Wu Yan-hong Hu Guo-qiang Ma Rui Yang Hua-chun He Ren-mu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

There exists a fatal disadvantage for the integrated induction motor load model of too many parameters, which leads to the difficulty of finding optimal parameters set in the identification process. For this reason, a model parameter reduction method is proposed in this paper, which divides the above 14 parameters into two parts: one fixed parameters part alpha F and the other part alpha C : parameters needing identification. After defining of the representability of the load model, the criterion of rational division of alpha F and alpha C is set as remaining the representability of the load model. Thus the strategy of parameter reduction belongs to the optimization methods. For avoiding the large scale optimizing process, the reduction method of building priority sequence based on parameters' sensitivity is proposed. In the end, a case study is given out on the basis of certain power grid measurement data, which verified the simplicity and effectiveness of the proposed method

关键词： Load modeling Induction motors Power system modeling Power system simulation Mathematical model Optimization methods Power system dynamics Differential equations Helium Large-scale systems

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