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Reliability Studies Of Power Systems Concerning Capacity Credit Of Wind Farms

Posted on:2011-12-07Degree:DoctorType:Dissertation
Country:ChinaCandidate:S ZhangFull Text:PDF
GTID:1102360305453244Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Wind power generation has some characteristics such as randomicity and volatility, if the penetration level of wind power exceeds certain value, the electric energy quality as well as stability and reliability of power systems will be seriously influenced, even large area is caused blackout. In this paper, first two-parameter Weibull distribution is used to simulate wind speed, then the reliability model of wind farms is established, which includs the wake effects of different terrain modeling by Jensen model and Lissaman model, and combining with outage model of wind turbine generator, active power generation of wind farms is calculated. Random variation of wind direction and wind speed influence is also included. Second, an adequacy assessment model of generation and transmission systems integrated with wind farms based on the sequential Monte-Carlo simulation approach is presented. In this model, the failure model based on two-states Markov process of main system units is discussed according to the research of adequacy evaluation algorithm. Depth priority algorithm is used to analyze the topology of network and search the subsystems after power system islanding caused by fault of transmission lines. Power flow distribution is calculated by DC power flow method, and then whether the transmission capacity is overload is judged and treated. The reliability indices of IEEE-RBTS and IEEE-RTS 79 are calculated by corresponding software, and the reliability of generation and transmission systems integrated with large scale wind farms is evaluated by comparison of different integration solutions.The wind farms capacity value is calculated based on the adequacy assessment model of generation and transmission systems integrated with wind farms, and the value of wind farms is evaluated in the view of capacity. Effective load carrying capability (ELCC) is considered to be the most appropriate standard to evaluate new added power unit capacity value of power system. The concept of ELCC is introduced; an algorithm about ELCC of new added power unit based on non-sequential Monte-Carlo simulation is presented. The calculations on the IEEE-IBTS test system added wind farm model is carried out, and the influencing factors of ELCC are analyzed.The calculation of capacity credit of wind farms is an important basis which decides the saving cost after wind farms replaced by traditional generators and the pool purchase price of wind power generation, and also improves economic value of wind farms. This paper presents a detailed definition of wind farms capacity credit, and a calculation method of capacity credit of wind farms based on non-sequential Monte-Carlo simulation is proposed, in which secant method will be used at calculation process. This method does not only consider the fault of transmission line, but also two different measures of capacity credit which have ideal reliable traditional generator and multi-states generator. The transmission line fault has effect on transmission capacity limitation and capacity credit of wind farms under conditions of the usage of traditional power flow calculation method. Corresponding software is programmed, and detailed analysis of the influence by wind turbine generator parameters and different integration solutions to capacity credit of wind farms is carried out based on case studies.
Keywords/Search Tags:wind power generation, reliability evaluation, Monte-Carlo simulation, Effective load carrying capability, wind farms capacity credit
PDF Full Text Request
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