| With the continuous development of human society,the dispersivity and diversity of electricity have gradually become a new form of electricity use.The isolated island microgrid can fully utilize the advantages of renewable energy and solve the daily electricity problems in remote areas and island residents.The PV/energy storage/diesel engine standalone system is widely used.This paper focuses on the research of the capacity optimization and multi-source coordination control strategy of the PV/energy storage/diesel engine standalone system.Taking the minimum annual average cost as the optimization goal,the nonlinear integer optimization model of the micro network capacity configuration is established,and the global optimal solution of the system is obtained by using the genetic algorithm(GA).A green node is proposed to make full use of solar energy,optimize the working state of the energy storage battery,and make the system stable.Energy management strategy is proposed.Based on this strategy,a coordinated control strategy of light storage Island microgrid system based on energy management is proposed,and the feasibility of the proposed strategy is verified by a simulation example.The main contents of this paper are as follows:(1)In the analysis of the PV/energy storage/diesel engine standalone system,the general situation of microgrid was introduced first,the isolated island microgrid system needed in this paper was established,and then the micro sources in the system were analyzed.The working principles of the photovoltaic system,energy storage battery and diesel engine were expounded in detail,and the physical model and output characteristics of the system were also carried out.The analysis shows that the dynamic model of the microgrid of the PV/energy storage/diesel engine is built in the software,and the whole network frame structure of the optical storage Island microgrid system is established.(2)In the aspect of the capacity configuration of the isolated network system,the function of the photovoltaic system,the energy storage unit and the diesel engine is analyzed and the related power model is set up.Under the premise of guaranteeing the reliability of the microgrid power supply,the 3 indexes of the economy,the environmental protection and the utilization of renewable energy are considered,and the 3 indexes are converted into the cost in a unified way.The minimum comprehensive cost is the optimization goal,and the nonlinear integer optimization model of the micro network capacity configuration is established,and the genetic algorithm(GA)is used to solve the specific capacity of each micro source,and the global optimal solution is obtained.It provides the specific data for the next step in the modeling of the Dig SILENT simulation software,and is ready to do the work well.(3)In the control strategy of the isolated network system,this paper first analyzes the current scheduling strategy of the microgrid,and optimizes the working state of the energy storage battery by making full use of the photovoltaic power to provide the power,making the system stable and economical running as the target,and proposes a green energy saving energy management strategy,and then introduces the traditional control side in the micro network.According to the different characteristics of photovoltaic generating set,energy storage battery and diesel engine,we choose the appropriate control mode,focus on the seamless switching of energy storage battery and diesel engine and the conditions of quasi synchronization.Finally,a coordinated control strategy of the PV/energy storage/diesel engine standalone system based on energy management is proposed,and using the Dig SILENT simulation software to build the corresponding isolated net system,the simulation results show the effectiveness of the proposed control strategy is designe,and the simulation results verify the effectiveness of the control strategy designed in this paper. |
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