Optimal Reactive Power Flow of Interconnected Power System Based on Static Equivalent Method Using Border PMU Measurements

A new static equivalent method using border PMU measurements is proposed to effectively retain various voltage and reactive power support characteristics of external network without real-time synchronous information of the entire external system. Based on the proposed method, a set of equivalent criteria is developed to determine whether the simplest and the most widely used PV/PQ equivalence is still appropriate. Based on the proposed equivalent method and criteria, we establish a new equivalent optimal reactive power flow model, which can achieve high calculation accuracy for interconnected power systems. The simulation results of the IEEE 39-bus system and an actual 661-bus system demonstrate the accuracy and effectiveness of the proposed method, criteria, and model.