Multipriority Hierarchical Reactive Power and Voltage Optimization Strategy for a Large-scale New Energy Island System Delivered by VSC-HVDC

VSC-HVDC plays an important role in transmitting large-scale new energy power. The fast reactive power regulation of the converter station and the unique topology of new energy cluster require special reactive power and voltage control strategy. This paper has proposed a multipriority hierarchical reactive power and voltage optimization strategy for a large-scale new energy island system delivered by VSC-HVDC. This strategy takes objectives of the dynamic reactive power margin of converter station, voltage safety margin of PCC point, reactive power coordination factor of each new energy station and system power loss into consideration, and has been verified based on the planning of Zhangbei VSC-HVDC project. The strategy can keep the dynamic reactive power margin and voltage safety margin at high level with acceptable power loss, and improve resolving speed at the same time.