Research On The Accommodation Of Photovoltaic Power Considering Storage System And Demand Response In Microgrid

Under the trend of increasing energy shortage and deteriorating environment,photovoltaic power develops rapidly.However,because of the intermittence,volatility and uncertainty of PV power output,the absorption of large-sacle PV power brings great difficulty to peaking load regulation of power system and leads to a large number of abandoned PV power.In order to solve the serious problem of abandoned PV power,the energy storage system can promote the absorption of PV power and reduce abandoned PV power.However,there is no change in the peak-to-valley characteristics of the user load,and the amount of PV absorption is greatly influenced by the parameters of the energy storage system.The demand response is an important interactive resource within the framework of smart grid,and it's flexibility makes it become an important way to absorb PV power.It established a microgrid system containing PV,energy storage system and demand response.Combining the current background of power market reform,it introduced the idea of game theory in the formulation of demand-side electricity prices to give full play to the role of demand-side users in the market.Finally,the validity of the model is verified by an example.In the PV microgrid,it started from the source side,establishing the PV microgrid model combined energy storage system.It analyzed the operation strategy of PV microgrid and energy storage system and made the comparison of the absorption of PV and operating costs before and after installing energy storage system.Finaly,it used MICA to solve the model.The results showed that installing energy storage system can promote the absorption of PV and reduce abandoned PV power operating costs.But this method did not change the load characteristics and is affected by the capacity of energy storage system.So it can do further research by introducing demand response.Secondly,from the perspective of the demand side,the demand response was introduced into the PV microgrid.And it analyzed the effects of demand response in promoting the absorption of PV power.Taking Time-of-use price as an example,the results showed that introducing Time-use-of price made the load curve more close to the PV power curve.This method improved the absorption of PV and reduced the load peak difference and operating costs.But the ability of demand response is limited.To further improve the consumptive level,it needed to fully dispatch more resource in source side and demand side.Finally,from the perspective of interacted source and demand resources,it established a microgrid system containing PV,energy storage system and demand response and set four scenes to make comparison,including not considering energy storage system or demand response,only considering energy storage system,only considering demand response,considering both energy storage system and demand response.The results showed that considering both energy storage system and demand response not only can promote the absorption of PV and reduce the abandoned PV,but also make more economic benefits compared to the scene of only considering energy storage system and only considering demand response.So this method can play an important role in promoting the absorption of PV power in microgrid.