Capacity Configuration Of Virtual Synchronous Microgrid Using Energy Storage As Main Power Supply

The microgrid containing energy storage units is an effective way to promote the wide-spread use of distributed energy sources and reduce the impact of volatile energy sources such as photovoltaics and wind power on distribution networks.Now,the application of microgrid is getting more and more attention.And its system configuration is the basis for stable and economical operation.The virtual synchronous microgrid with energy storage as the main power source realizes the virtual synchronization performance of the microgrid through the control of energy storage microelements.When grid-connected,energy storage is responsible for multiple tasks such as response to the grid and internal benefits such as reducing the peak-to-peak difference in power consumption.When off-grid,the energy storage is responsible for the voltage and frequency support tasks of the microgrid and needs to be able to bear the high power fluctuations.And off-grid switching,energy storage needs to be able to achieve seamless switching tasks to deal with randomness.The implementation of these tasks needs to be con-sidered with the minimum economic cost as a condition,and therefore these all can't be sepa-rated from a reasonable system configuration.Studying the optimal configuration methods for energy storage capacity and photovoltaic and other new energy capacity for multiple op-erating targets and load characteristics will be beneficial to the wide application of microgrid technology.This subject takes the industrial application microgrid as the research object,and pro-poses a targeted practical method for optimizing the configuration of microgrid capacity.The main tasks are as follows:1.In view of the harmonics caused by the intermittent and random output of new energy generation,problems such as serious losses caused by power outages in large power grids and other problems are discussed.The role of micro-grid energy storage modules is discussed.The effect of energy storage is often inconsistent with the economics.It discusses the control strat-egies and algorithms based on optimal configuration and reviews the existing configuration methods.2.Modeling the light output.In order to improve the modeling accuracy,a decomposition method of photovoltaic output curve was proposed.Based on the deterministic component and the uncertainty component,a random forest-Markov chain is established to obtain the weather-related time series output sequence,which provides the basis for the following.3.Based on the optical radiation simulation sequence,when the ratio of the total monthly power consumption to the current month's total radiation is the maximum,the method of obtaining the known load power for the number of photovoltaic panels and the known photo-voltaic panel area to obtain the power generation amount is given after taking into account the conversion factor;4.The energy storage and the capacity configuration of the diesel engine are performed in two working conditions including the connected-grid and the off-grid.The appropriate con-trol strategy can effectively reduce the proportioning capacity and improve the economy.Therefore,the control strategy under two conditions is designed.Taking the load-shedding rate and expectations as indicators,taking into account the economy and grid dependence,the specific configuration results are given by assigning weights using NSGA-II.5.A microgrid operation evaluation index system and evaluation table based on fuzzy analytic hierarchy process are given.6.The capacity configuration of the micro-grid operation monitoring system was de-signed and developed based on Visual Studio.