Day-ahead stochastic optimal dispatch of LCC-HVDC interconnected power system considering flexibility improvement measures of sending system

Abstract

This paper proposes a day-ahead (DA) two-stage stochastic optimal dispatch strategy of line commutate converter-based HVDC (LCC-HVDC) interconnected power system, considering two flexibility regulation measures of sending system. First, the energy storage systems (ESSs) are used to suppress the real-time (RT) power fluctuations of sending system net loads decomposed by the Hodrick-Prescott filter under the two-stage stochastic programming structure, which can feedback to DA stage. Second, the flexible adjustment characteristics of LCC-HVDC power are modeled, and the actions of reactive power control equipment (RPCE) are limited for the operation safety. The static operation model of converter stations is linearized, and the linearization errors are analyzed by the probability statistics of multiple scenarios. The effectiveness of the proposed strategy is verified on the wind power LCC-HVDC transmission system.