Dynamic reactive power optimal allocation to decrease wind power curtailment in a large‐scale wind power integration area

Abstract

Autonomous voltage security regions (AVSRs) have been proposed to prevent cascading trip faults in wind farms. However, due to insufficient dynamic reactive power (DRP) support and unreasonable DRP allocation in large-scale, centralised wind power integration areas, especially for high wind power penetrations, AVSRs may be too small to guarantee secure wind farm operation, resulting in large amounts of wind power curtailment. DRP allocation is crucial for wind farms to accommodate more wind power and decrease curtailment. Therefore, a DRP allocation scheme based on the AVSR to accommodate more wind power is proposed in this work. An improved AVSR considering wind power curtailment is first derived; the function between the AVSR, DRP reserves and curtailment is then obtained, and an optimal DRP allocation scheme using Benders decomposition is finally proposed. Good performance is observed when tested on a real large-scale wind power base in Northern China.