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

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

引用

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

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

引用

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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Research on DC Bias Due to Magnetic Storm and DC Transmission

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

引用

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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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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A Novel HVDC Transmission system with Parallel Large Capacitor Connected in the DC Side of the Rectifier and Its Technical Feasibility

A Novel HVDC Transmission System with Parallel Large Capacit...

引用

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

作者： Chengyong Zhao Haibo Cui Gengyin Li Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

In this paper, a novel HVDC transmission system is presented which is with parallel large capacitor connected in the DC side of the rectifier (shorted form HVDC-C). The fundamental principle and technology characteristics of HVDC-C are analyzed. The study shows that HVDC-C reduces the component of harmonic voltage and harmonic current both side in AC system and DC transmission line, makes control strategy more flexible and the filter structure more simple, etc. Furthermore, the control method, contrast to conventional HVDC and application foreground of HVDC-C is discussed briefly. The simulations based on PSCAD/EMTDC show that HVDC-C can operate steadily, has the capability to restore steadily when short circuit fault occurs, and is feasible technically and obvious in advantages

关键词： HVDC transmission Capacitors Rectifiers power harmonic filters Transmission lines Voltage control control systems Circuit simulation PSCAD EMTDC

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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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An application to set up a model to forecast electric rate adjusted through cos/spl Phi/ using regressive analysis

An application to set up a model to forecast electric rate a...

引用

International power Engineering Conference (IPEC)

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

ISBN: (纸本)9810557027

A 2-step tariff mechanism is adopted in Chinese electric power market. That means the payment of the customers is calculated through the cosPhi of a net node. So the value of cosPhi is used to adjust the rate of consumer's tariff. But because of the policy, the value of the adjusted rate can't be calculated accurately in advance. Some problems always lie in how to choose a proper model to make sure the adjusted value of electric rate when to analyze the economic benefit. The paper firstly points out the disadvantage of traditional method on forecasting the adjusted rate through cosPhi. Then it presents a new method to establish the forecast model based on regressive analysis. The model proposed here was applied in a distribution company and given the reasonable result. The paper describes the applicability of the proposed model and gives some explanation for application

关键词： Predictive models Economic forecasting Reactive power Laboratories power system protection power system dynamics power system security monitoring control systems power generation economics

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Self zero sequence component control of dynamic voltage restorer in systems with different neutral point grounded modes

Self zero sequence component control of dynamic voltage rest...

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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. China Electric Power University China

ISBN: (纸本)9810557027

The dynamic voltage restorer (DVR) has become popular as a cost effective solution for the protection of sensitive loads from voltage problems such as sags. There are many investigations on DVR dealing with the unbalanced operation situations, however, few found in the area relating to DVR self zero sequence component control in power grid with different neutral point grounded modes. In fact, incorrect control strategy of zero sequence will lead DVR to instability in a special system condition. This paper studies the generating mechanism of self zero sequence component in systems with different neutral point grounded modes and presents effective control strategy to get rid of its influence. Simulations are carried out to verify the validity of proposed self zero sequence component control strategy

关键词： Voltage control control systems power harmonic filters Frequency power system restoration power system harmonics Costs power system protection power grids power quality

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Research on dynamic Mathematic Model of VSC − HVDC Based on Energy Conservation Principle

Research on Dynamic Mathematic Model of VSC − HVDC Based on...

引用

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

作者： Guangkai Li Gengyin Li Chengyong Zhao Haifeng Liang 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

Voltage source converter (VSC) based HVDC (VSC-HVDC) technology is a kind of newly developed HVDC transmission technology. Based on analyzing the fundamental functions of VSC-HVDC, a dynamic mathematic model based on energy conservation principle is developed in this paper. The process of energy conversion and dynamic operation mechanism are analyzed. Theoretical analysis and the control system are validated by simulation on software PSCAD/EMTDC

关键词： Mathematics Mathematical model HVDC transmission Energy conservation Converters power conversion Voltage Energy conversion control system analysis control system synthesis

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Determination of Total Transfer Capability Incorporating FACTS Devices in power Markets

Determination of Total Transfer Capability Incorporating FAC...

引用

International Conference on power Electronics and Drive systems (PEDS)

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

It is very important and necessary to calculate total transfer capability (TTC) incorporating flexible alternate current transmission system (FACTS) devices in power markets and analyze impacts of FACTS on TTC. Calculating TTC incorporating with FACTS devices is an optimal problem constrained by some equalities and inequalities. This paper proposes a mathematical model for calculating TTC incorporating with FACTS devices in power markets, and detailed calculation method is also put forward. The constraints include voltage constraints, thermal stability limits, generator's capacity limits, load demand, steady-state power flow, and control parameter constraints of FACTS devices, etc. The sensitivity-based repetitive linear iterative approach is proposed to solve the proposed model. The detailed solution process is described in this paper. To realize the proposed model and calculation method, a TTC calculation software incorporating with FACTS devices is developed based on PSASP/UPI, a set of advanced application software package developed by China Electric power Research Institute. This paper proposes a new approach on combined TTC solution including FACTS and power flow calculation based on PSASP/UPI, and gives the interface program for user programming interface (UPI) in PSASP. The IEEE 14-bus test system is used to verify the proposed algorithm and program. Numerical results show that FACTS devices and their locations have different impacts on TTC, also prove that the proposed model and algorithm is correct and effective

关键词： power markets Flexible AC transmission systems Load flow Mathematical model Thermal loading Thermal stability power generation Steady-state Voltage control Iterative methods

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