A Feedback-Based Active Power Decoupling Control Strategy for Virtual Synchronous Generators

Virtual Synchronous Generator (VSG) control technology is an effective way to provide inertia support for inverter-based resources, whereas the VSG also faces the issue of low-frequency oscillation (LFO) like that in synchronous generators. Especially when applied in low-voltage grids, where the line impedance exhibits the resistance-inductance characteristics, and the power coupling can exacerbate the LFO. At this point, the power coupling problem cannot be ignored. In order to solve this issue, a power decoupling control strategy is proposed to eliminate the adverse influence of the reactive power control loop on the active power control loop, thereby suppressing the LFO deteriorated by power coupling. The effectiveness of this method is validated through the simulation results.