Adaptive SPMC Frequency Modulation Strategy for AC/DC Interconnected Grid Including Wind Power

Connecting large-scale wind power into AC/DC interconnected grid put forward higher requirements on the control performance and frequency regulation ability of automatic generation control (abbr. AGC). On the basis of wind power participating power system frequency regulation, a supplementary power modulation controller (abbr. SPMC) based inter-regional power compensation strategy was proposed. Firstly, considering the elastic characteristics of overload rate variation in HVDC link, an adaptive dynamic SPMC strategy, in which the variation of power and frequency was considered simultaneously, was put forward. This strategy could effectively promote the rapidity of power regulation in HVDC when SMPC participated in the system frequency regulation. Secondly, based on the active participation of HVDC link in the system frequency regulation, considering the uncertainty of wind power, the integrated inertia control was utilized to change wind power output to further improve system frequency regulation performance index. Simulation results show that the dynamic power regulation characteristics of the put forward strategy can effectively enhance the pertinence of inter-regional power transmission and improve the effect of power grid frequency regulation.