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Research On Control Strategy For Microgrid Based On Average Consensus Of Multi-agent

Posted on:2021-01-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y Q ZhangFull Text:PDF
GTID:2392330605458040Subject:Power system and its automation
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In recent years,with the rapid development of the world economy,the continuous consumption of renewable energy has aggravated the energy crisis and environmental pollution.Researchers at home and abroad have been actively exploring solutions,and the distributed generators supply regarding renewable energy as the main source has developed rapidly.The distributed generators is incorporated into the power grid in the form of microgrid,which not only facilitate the control of the distributed power supply output,but also ensure the safe and reliable operation of the power system.Microgrid has two modes of operation: grid-connected and isolated island.In order to enable the microgrid to adjust itself independently during isolated island operation and ensure the output frequency and output voltage to be maintained near the rated value,it is not only the basic requirement for the stable operation of the system and equipment,but also the necessary condition to provide users with high-quality power resources.The reasonable distribution of power output can effectively improve the efficiency of power generation equipment.Combined with the consensus algorithm of multi-agent system,this paper aims to realize the frequency,voltage stability and optimal power distribution of isolated microgrid,mainly from the following two aspects:(1)A distributed control strategy of micro-grid based on the fast consistency of multi-agent was designed to offset the frequency and voltage deviation caused by the droop control of microgrid,as well as the unreasonable power distribution.Based on the droop control,the second frequency voltage control layer and the third power control layer are added.By using the fast consistency algorithm,the deviation compensation of the system is obtained,the frequency and voltage are kept stable,and the output power of the distributed power supply is distributed according to the proportion of the standby power.In addition,the fast consistency algorithm also improves the response speed of the system and makes the operation of the microgrid more reliable.(2)A dynamic droop control strategy with network delay is proposed to solve the problem of network delay in the practical application of microgrid.In this strategy,a curve of slope changing with time is used to simulate the actual droop coefficient.At the same time,the influence of network delay on system stability and control performance is studied by using multi-agent consistency algorithm and transmission delay module.
Keywords/Search Tags:Microgrid, multi-agent system, Consensus, Droop control, Network delay
PDF Full Text Request
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