Analysis And Optimization Of Photovoltaic Micro Grid Standalone Operation

Photovoltaic micro grid system is a kind of small-scale system with photovoltaic power generation as the main energy supply while other power generation forms as auxiliary.Photovoltaic micro grid systems can provide power to nearby users and the remaining power can be used to store the battery.It can also be connected to the grid and into the system for other users.It can solve the problem of excessive power generation caused by waste and solve the problem of peak load power shortage.However,when the grid failure or other conditions,the micro-grid needs to be in the standalone state of operation.This paper researches the state of Photovoltaic standalone micro grid system.The output of photovoltaic power supply is affected by light and temperature and the illumination and temperature in one day are obvious and random.Therefore,there is a large volatility of PV output;the system needs the control strategy to control parameters and run the system.It needs to maintain the voltage,frequency and other operating indicators within a reasonable range.Therefore,a systematic and relatively accurate control method is needed to ensure the stability of various electrical energy indexes in the system so as to make the system keep stable under various changes of the load.In the paper,"the improved V-f control strategy" is adopted to control the operation of Photovoltaic standalone micro grid system.The control strategy is designed for a system with a plurality of photovoltaic power sources in the micro-grid.The system is controlled by a main control power supply into a plurality of main control power sources.And the power supply is coordinated with each other.The system voltage and frequency can be maintained within the standard range with the strategy.In addition to the control strategy of standalone micro grid system operation,it is necessary to analyze and optimize the economy of the system,so that the photovoltaic micro grid system has the best economy in all aspects.Based on the three indicators of environmental protection,economy and reliability,this paper establishes the optimization model of islanding operation and gives the corresponding constraints.The optimization objectives is minimum cost with the various types of power to optimize the configuration.The genetic algorithm is used to solve the planning model.Finally,an example is given to show the optimization of the method is beneficial to the operation of Photovoltaic standalone micro grid system.