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

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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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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...

引用

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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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...

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. 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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Data Mining Used For the Assessment of the Ability of Bidding Units

Data Mining Used For the Assessment of the Ability of Biddin...

引用

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

作者： Li Ran Li Jinghua 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 new data-mining method for assessment of the ability of bidding units is proposed in this paper. The algorithm of reducing attribute value is introduced to get minimum rules. An example which considers the various factors is illustrated the procedure of finding association among many factors and then obtained the rules to assess bidding units ability. The rules are very useful in supporting the generating bidding unit to make decisions and helping the electric agency (power exchange-PX) and (independent system operator-ISO) to design an optimal trade plans

关键词： Data mining power generation power markets Economic forecasting power generation economics ISO Industrial control Radio access networks Demand forecasting power system economics

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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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Application in Electric power System Transient Stability Analysis with PC Cluster System

Application in Electric Power System Transient Stability Ana...

引用

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

作者： Lu Jinling Yu Lei Zhu Yongli Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

In this paper, a simple parallel calculation cluster is built by PC and local area network. The power electric network is divided into several subnets according the method of path graph partitioning. Subnets are allocated to PC unit to calculate individual and the server is in charge of adjusting process and counting the current of link line. Besides soft-hard ware environment of PC cluster is given in this paper and the design and implementation of program are also presented. The key technique and way to settle problem are discussed during implementation procedure. At last, the IEEE39 nodal points system is tested. The satisfaction result is gotten by comparing to single computer

关键词： power system transients Transient analysis Stability analysis power system simulation power system dynamics power system security Local area networks Computational modeling Analytical models Acceleration

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Analysis and control of Wind Farm Incorporated VSC-HVDC in Unbalanced Conditions

Analysis and Control of Wind Farm Incorporated VSC-HVDC in U...

引用

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

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

With increasing attention to sustainable development and environmental protection, more and more countries turn to wind energy to reduce their dependence on traditional fossil fuel energy. Among the new challenges with this trend is how to integrate wind farm with existing AC network more effectively. The paper presents a possible measure based on VSC-HVDC, namely so-called wind farm incorporated VSC-HVDC (WVSC-HVDC). In the paper the wind farm along with an AC grid supplies to a passive network. The paper firstly introduces VSC-HVDC, and then presents a space vector based control strategy for supplying to a passive network. The rectifier controls DC voltage and reactive power that is needed by the wind farm. The inverter controls the AC bus voltage in the passive network. Simulations using PSCAD/EMTDC are performed to study the steady and transient behaviors of WVSC-HVDC. With harmonics analysis, the simulation results will be helpful for further understanding of the operation characteristics of WVSC-HVDC and its protection design

关键词： Wind farms Passive networks protection Voltage control Sustainable development Wind energy Fossil fuels Rectifiers Reactive power control Inverters

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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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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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