Control Strategy for a Two-Stage PV Grid-Side Inverter with Active Participation in Frequency Regulation

Massive PV grid penetration squeezes the functional space of traditional synchronous generating units in the power system, decreasing inertia for the grid itself. For this reason, this paper presents a control strategy for frequency regulation based on the dynamic characteristics of the grid-side DC capacitor. Initially, the control method for the PV inverter is optimized, and the mechanism for the dynamic response model of grid frequency under PV penetration is analysed; secondly, a three-machine and nine-node simulation model is erected; ultimately, this paper analyses the capability of inertial power support for the FR strategy under diverse control parameters and proves the effectiveness for the control method.