【摘要】 在多光储与虚拟同步发电机(Virtual Synchronous Generator, VSG)单元互联组成的交流微电网中，其功率协调和稳定运行机制存在显著复杂性。针对多光储与VSG单元互联的交流微电网功率协调与稳定运行问题，首先通过荷电状态(State of Charge, SOC)自适应增益调节VSG调频特性参数，使各储能锂电池SOC趋于一致；其次利用超级电容SOC信号调整其承担功率分量，平缓锂电池功率波动；最后增加虚拟功率环节并多机参与预同步，实现并/离网平稳切换。仿真表明，所提策略可改善功率分配、均衡SOC并实现平滑过渡。更多还原

【Abstract】 In an AC microgrid composed of multiple photovoltaic-energy storage units interconnected with virtual synchronous generators(VSG),the power coordination and stable operation mechanisms exhibit significant complexity.To address the issues of power coordination and stable operation in such a microgrid, this paper proposes the following strategies: first, the state of charge(SOC) adaptive gain is employed to regulate the frequency regulation characteristic parameters of the VSG,thereby achieving SOC consistency among the lithium battery energy storage units; second, the SOC of supercapacitors is utilized to adjust their respective power sharing ratios, effectively smoothing the power fluctuations of the lithium batteries; finally, a virtual power loop is introduced and multiple VSG units participate in pre-synchronization, enabling smooth switching between grid-connected and islanded modes.Simulation results demonstrate that the proposed approach improves power sharing, balances SOC among units, and achieves seamless transition.更多还原