Consensus Algorithm based Active Support Control Method for Grid Connected Photovoltaic Voltage Sourced Converters

Voltage sourced converters (VSC) is a flexible and efficient interface for grid connected Photovoltaic power generation (PV), this paper presents an active frequency control method for grid connected PV-VSC to improve dynamic stability of power system. First an equivalent single PV-VSC model is built to illustrate frequency static characteristics and frequency response curves. Then the active frequency control method is proposed based on the consistency algorithm which enable PV-VSC state perception ability and regulate the frequency actively based on its operation status. The control system is three hierarchies control, namely frequency response control, PV power reserve control and voltage control, which can dispatch frequency regulation power between and within PV-VSC and regulate power system frequency immediately. Simulation results prove the correctness and feasibility of the proposed control method.