Multi-Timescale Coordinated Control of Wind Power Plant for Supporting Power System Operation

Wind power plants (WPPs) are increasingly expected to be dispatchable and provide frequency regulation support (FRS) to support power system operation. However, the inherent wind power intermittency and variety make it challenging to achieve these goals simultaneously. This paper proposes a multi-timescale coordinated control framework considering the response characteristics of wind turbine generators (WTGs) using different deloading methods. (1) In the minute-level timescale, to address wind fluctuation issues, wind speed prediction results are used to coordinate WTGs using overspeed and pitch control-based deloading methods for balancing between tracking dispatch commands and preserving regulation reserve. Meanwhile, the fast reserve from WTGs using the overspeed deloading method is preserved priorly, considering their better frequency regulation performance. (2) In the second-level timescale, to improve the dynamic performance of a WPP, a power sharing strategy is proposed, where primary and secondary frequency regulation signals are decomposed to be shared among WTGs according to their response characteristics. Case studies validate the effectiveness of the proposed method.