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Research On Optimal Control Of Microgrid With Distributed Power Generation And Energy Storage

Posted on:2019-04-13Degree:MasterType:Thesis
Country:ChinaCandidate:S M PeiFull Text:PDF
GTID:2322330566457974Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
The traditional energy generation methods in the world are mainly thermal power,however,thermal power generation will cause environmental pollution and energy depletion.In order to achieve the sustainable development of energy,distributed generation technology has been developed both at home and abroad in recent years,and the diversity of microgrid has made it a more effective carrier of distributed generation technology.However,there are also some problems such as power oscillation,voltage fluctuation and unbalanced output power of inverter when switching mode of microgrid.To some extent,it restricts the development of microgrid.The main content of this paper is to study the optimal control of microgrid.The research of droop control strategy,fuzzy PID controller and virtual impedance characteristic to optimize the operation of microgrid system,and improve the stability of microgrid system.Firstly,combining the characteristics of traditional droop control strategy and fuzzy PID controller,an improved droop control method is designed under the condition that the equivalent output impedance of inverter is inductive.The Simulink simulation is carried out in the switching mode of microgrid,which proves the effectiveness of the proposed control method in optimizing the mode switching of microgrid.Secondly,under the condition of considering the line impedance,a voltage and current dual loop control model is established.According to the control variable method,the influence of line impedance parameters on the output power allocation,frequency and system circulation of distributed power inverter is analyzed,which lays the foundation for subsequent parameters setting.Finally,combining with the characteristic of virtual impedance to optimize the line impedance parameters of microgrid system.We try to add conventionalvirtual impedance and adaptive virtual impedance to optimize the operation of the system,and the simulation results of Simulink show that the effectiveness of adaptive virtual impedance control strategy.
Keywords/Search Tags:traditional droop control, switching mode of microgrid, fuzzy PID control, power allocation, virtual impedance, adaptive
PDF Full Text Request
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