Control strategy of controllable shunt reactors (CSR) in Zhangbei substation of Zhangbei-Xiongan UHV project

Abstract

Based on the incremental control method of reactive power demand, this paper considers accessing the status information of low-voltage reactive power compensation devices and the reactive power exchange information of the medium-voltage side of the main transformer, so as to realize the reactive power balancing of the partition system, which is composed of the substation and half the length of substation outlets. Aiming at the actual situation of Zhangbei UHV substation interconnected with wind farms, this paper further considers the constraint of reactive power flow ride-through, so as to generate an inner-layer control strategy, which comprehensively considers the reactive power balancing of partition system and reactive power flow exchange. This inner-layer control strategy and the outer-layer control strategy of voltage boundary emergency control together constitute double-layer control strategy of controllable shunt reactors in Zhangbei UHV substation. This control strategy has passed the thematic review conference organized by the State Grid UHV Department, and has been applied to Zhangbei UHV substation.