A fast corrective load shedding control scheme to prevent AC/DC systems voltage collapse

摘要

This paper proposes a corrective load shedding algorithm to restore power flow solvability of AC/DC systems after severe contingencies. Firstly, contingency parameterization power flow is constructed to describe a set of multiple contingencies, including generators, HVDC links, ac lines and transformers. The post-contingency critical point is quickly determined through optimal multiplier power flow and a simple optimization-based outage parameter updating procedure. The updating strategy is better improved by the analysis of stability surface. At the nose point, the sensitivity analysis is performed to select the most effective control measure. Then, the corrective load shedding sensitivity-based linear programming model is constructed to improve the stability margin. The numerical simulations on a practical 1621 bus system testify that the proposed method can prevent system from voltage collapse effectively and efficiently.