Robust Control Method Research On Distributed Generation System In Microgrid

Microgrid provides the effective technology for large-scale applications of new energy and renewable energy distributed generation and technical support for distributed generation to operate safely and reliably in smart grid.Microgrid has become one of the latest research focuses in electrical engineering field.However,the model reduction,environmental changes,component aging and other factors of photovoltaic power,diesel generators and other types of distributed power generation systems in microgrid seriously affect the dynamic performance of microgrid control quality and even the safe and stable operation.Therefore,the study of robust control on distributed power generation system in microgrid is significantly important.Firstly,this paper describes the technical characteristics of distributed generation and microgrid,summarizes the research status of microgrid robust control,and analyzes the concepts of uncertainty and robustness and the theoretical system of robust control.Then,loop shaping principle is applied to improve the anti-interference performance of the diesel power generation power generation system in microgrid.After that,the two degrees of freedom H_?loop-shaping control theory is applied on the design of diesel engine speed controller,which guarantees the robust stabilization of shaped objects and the inhibition of tracing error caused by load disturbance to improve the response precision of diesel engine speed control system.Finally,aiming at the effect of component parameter perturbation which was caused by environmental changes,component aging and so on,a?-synthesis robust control method for flexible grid-connection of photovoltaic generation system based on model matching is proposed to better ensure its nominal performance and robust performance.The simulation results show that the loop-shaping principle,H_?control theory and?-synthesis robust control method is feasible and effective on micro grid robust control.