Study On The Multi-objective Optimization Of Micro-grid Based On Improved Differential Evolution Algorithm

Micro-grid is a small power supply for a series of links to the system integrated distributed generation,load,energy storage and protection and control,which can solve the contradictions between the power system and distributed power,and overcome the shortcomings of distributed generation,such as low power,high cost and difficulty of network operation control and so on.It is a kind of most development potential of the new power generation technology.In recent years,it has been widely concerned by domestic and foreign researchers.This thesis studies the key problems existing in the current calculation and operation optimization of micro-grid.The research mainly starts from the following aspects:Firstly,the research background and significance of the subject,the definition of micro-grid characteristics and research status are introduced respectively.The key problems of micro-grid research are also discussed.Secondly,it has established a variety of DG models,and according with backward flow calculation,that handle the four node types of PQ?PV?PI and P-Q(V),derived three-phase power flow calculation equation of micro-grid.Then,it derives static voltage stability index and the calculating formula for network loss,based on micro-grid flow equations,and compares with the distributed power of the position,capacity and power factor's impact on the micro-grid voltage and the loss for concluding its regular which shows that seasonable allocation plays an important impact on the benefits of distributed power's play.Finally,considering both economy and security of micro-grid,an optimized multi-objective economic model is established to optimize the voltage level of micro-array,minimize network damage and operation cost,introduced the concept of self-adaptive proportion method and self-adaptive penalty function,proposed self-adaptive genetic algorithm,and it solves multi-objective optimization problems into single objective ones.The validity of theoretical research and simulation analysis is verified by using 30 Node of micro-grids.