Two-stage AC/DC optimal power flow with VSC-MTDC considering uncertainty of wind power

Considering the impact of uncertain wind power integrated through a multi-terminal flexible direct current (VSC-MTDC) transmission system on the operation of an AC system, a two-stage AC/DC optimal power flow model with VSC-MTDC considering wind power uncertainty is proposed. This paper focuses on the optimization of VSC-MTDC in real-time scheduling, based on the dispatching idea of "multi-level coordination and step-by-step refinement". During intraday rolling dispatching, the model optimizes the generator's operation cost according to the short-term forecast data of wind power. During real-time dispatching, it continuously adjusts and optimizes the control instructions of the VSC converter station and the output of the buffer unit based on the ultra-short-term forecast data of wind power, and corrects the impact of short-term forecast errors of wind power on AC system network losses and voltage levels immediately. The proposed model is applied to the IEEE 30-node and IEEE 118-node example, and the validity and feasibility of the proposed model are verified. © 2020, Power System Protection and Control Press. All right reserved.