The static synchronous condenser (SSC) is a new type of device that adopts grid - forming control technology and combines technologies such as high - voltage cascading of power electronics and short - term energy storage of supercapacitors. The power unit is its key component. When the system voltage suddenly changes, the voltage - source - type grid - forming control strategy with independent amplitude and phase of the internal electromotive force it adopts can quickly calculate the power command value through the power outer loop, respond rapidly to system changes, improve transient support capabilities to support the power grid, and enhance anti - disturbance capabilities.