孤岛模式下基于VSG的光储发电系统多机并联运行策略OA北大核心

With the large increase of installed capacity of photovoltaic power generation,the power system presents the characteristics of"low inertia and low damping",and the proposed virtual synchronous generator(VSG)technology can enhance system stability and power supply reliability.A collaborative adaptive control strategy is proposed to address the uneven system circulation and power distribution issues caused by impedance differences and load switching in the photovoltaic energy storage-VSG parallel system in isolated island mode.Firstly,the virtual impedance value is dynamically adjusted by the system reactive power deviation to achieve accurate allocation of reactive power and thus suppress the steady-state circulation of the system.Secondly,in order to enhance the system dynamic characteristics and suppress the oscillation of the system during load switching,a two-input and three-output radial basis function(RBF)neural network was established to optimize the key parameters of the system.Finally,three optical storages-VSG parallel models were established,and different capacity ratios were set for simulation analysis to verify that the proposed control strategy can better suppress the system circulation and ensure the stable operation of the system.