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Research On Economic Dispatch Of Microgrid And The Reliability Of Distribution Network With Microgrid

Posted on:2016-10-04Degree:MasterType:Thesis
Country:ChinaCandidate:H PanFull Text:PDF
GTID:2322330473465842Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
The smart grid is the development trend of modern power grid,more and more distributed generations are connected to distribution network, the distributed generation technology is keeping rapid development. And the microgrid including a variety of distributed generations and loads is an essential part of the smart grid. The microgrid converts conventional radial distribution network with single power supply to a new one all over power supplies and loads, which has significant influences on planning, operation and control of power system, such as distribution network dispatch, power quality and reliability of the system.The microgrid is an effective supplement to the power system and a highly active form used by distributed generations, the economy of microgrid is the key to further development in power system, so it is necessary to study the microgrid economic dispatch. According to the characteristics of distributed generation, considering different fuel, maintenance, gas emission and electricity puraching costs of various DGs, a mathematic model about economic dispatch of microgrid is built in which the minimum operation cost is taken as the objective. An improved plant growth simulation algorithm is applied to the research of economical DG unit dispatch. In order to solve the problem of slow speed in global search caused by a lagre increse of growing point while having full simulation of plant growth, we can improve the algorithm through the method of reserving the best and reserving the better after the hybridization of the worst, which accelerate the calculation speed while restraining precocity and preventing into local optimum. The validity and feasibility of the proposed model and method was verified by a case study.The microgrid has greatly increased the complexity of the distribution network reliability evaluation, so it is a pressing need to solve the problem about the influence on distribution network reliability. The output power of wind power generation and photovoltaic generation are stochastic and energy storage can smooth out the fluctuation. Considering the characteristics of DGs and collaborative operating strategies of energy storage, a model of microgrid containing wind power generation, photovoltaic generation and energy storage is bulit. And a hybrid method based on zone model failure modes and effects analysis and sequential Monte Carlo is proposed. First, the distribution network is devided into zone model based on feeder partition and an unit FMEA table is generated, which quickly locate the interruption load caused by fault and accelerate the calculation speed. Then combined with sequential monte carlo method, the evaluation process is put forward which be analyzed from inside and outside microgrid.The evaluation results show that it is feasible of coordinated operation, and collaborative operating strategies have a large impact on the reliability of distribution network. Increasing the capacity of microgrid can raise the distribution network reliability, but it tend to be saturated when up to a certain value. In addition, due to the traditional single indicator can not fully reflect the role of microgrid, a comprehensive evaluation indicator of microgrid is presented, further the new indicator is analyzed by the case. The results can provide a valuable reference for the microgrid planning and design.
Keywords/Search Tags:microgrid, distribution network, economic dispatch, plant growth simulation algorithm, failure modes and effects analysis, Mote Carlo, reliability evaluation
PDF Full Text Request
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