Damping support strategy of virtual synchronous machine

The invention discloses a damping support strategy for a virtual synchronous machine. The damping support strategy is specifically implemented according to the following steps of: 1, establishing a second-order model of a synchronous generator, and acquiring a power-frequency transfer function; 2, applying power disturbance to the second-order model of the synchronous generator through a VSG grid-connected control circuit, and calculating a frequency response function under the power disturbance; and 3, deriving a frequency response function under power disturbance, and setting a damping coefficient to obtain a steady-state frequency after disturbance. The problem that the inertia time constant is not matched with damping is avoided, and the grid-connected stability and reliability of the virtual synchronous machine are improved. 本发明公开了一种虚拟同步机的阻尼支撑策略，具体按照以下步骤实施：步骤1、建立同步发电机二阶模型，获得功率-频率的传递函数；步骤2、通过VSG并网控制电路对同步发电机二阶模型施加功率扰动，计算该功率扰动下频率响应函数；步骤3、对功率扰动下频率响应函数求导，并设置阻尼系数，获得扰动后的稳态频率；避免惯性时间常数和阻尼不匹配的问题，增加的虚拟同步机并网的稳定性与可靠性