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Research On A Microgrid Control Strategy Based On Wind Power Hybrid Energy Storage

Posted on:2021-05-07Degree:MasterType:Thesis
Country:ChinaCandidate:R N GuoFull Text:PDF
GTID:2392330602494077Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
Due to the burning of fossil fuels,carbon dioxide is released into the atmosphere,causing the atmosphere to capture solar radiation,which in turn leads to global warming or the "greenhouse effect." In the current energy market,the strong expansion of the wind energy market has consolidated its position as a mainstream green energy source.The latest outlook of the International Energy Agency(IEA)for the wind power industry indicates that wind power will become one of the main power sources of all power generation by 2040.During the "Thirteenth Five-Year Plan" period,distributed power generation,as a new power generation method,can make full use of local clean and renewable energy sources and become an effective means of developing green energy sources.However,distributed power generation is unstable,and when it is directly connected to the microgrid,it will seriously affect the reliability of the power generation system.As a weak grid system,when it is impacted,the reliability of power supplies is easily affected.Therefore,how to control the continuous and reliable power supply of the micro grid is the key issue to ensure the quality of the micro grid.In order to solve the problems of unstable power generation of wind power microgrid system and insufficient reliability when connected to the grid,first of all,in this paper,the modeling and control strategy of permanent magnet direct-drive wind power generation system are studied.On this basis,the wind power generation system is equipped with corresponding The energy storage system can effectively alleviate the volatility problem caused by wind power generation.For the energy storage system,the charging and discharging principles and characteristics of the lithium battery and supercapacitor models are analyzed.Because they are complementary to performance,they form a hybrid energy storage system,make full use of the advantages of the two,and are equipped with corresponding control strategies.,Can effectively extend the service life of the system,is an effective and economical method to improve system efficiency.Secondly,in order to meet the power fluctuation problem of the wind power generation connected to the DC microgrid,in order to meet the continuous high-quality power supply demand,the goal is to stabilize the voltage of the DC bus and maintain the system power balance through the hybrid energy storage system.The simulation results show that the hybrid energy storage system has a faster dynamic response speed and bettercontrol performance,can well meet the load powered requirements,and stabilize the DC bus voltage.Finally,a microgrid coordinated control strategy based on wind power generation is proposed to the grid-connected and island mode of microgrid operation.Specifically,a model predictive power and voltage control(MPPVC)method is adopted for AC / DC converters to provide high-quality voltage and ensure smooth power transmission.At the same time,it can achieve smooth grid synchronization and connection,and ensure stable operation under changing power generation and load consumption conditions.The research results to provide a reference to the analysis of the stability of large-scale new energy access to microgrid systems,and have certain guiding significance of the issue of renewable energy distributed power consumption and the actual development and application of the system.
Keywords/Search Tags:Wind power, Microgrid, Hybrid energy storage, Voltage fluctuation, Model prediction
PDF Full Text Request
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