Voltage Stability Analysis of AC/DC System Considering Static Load Characteristics

摘要

With the rapid construction of UHV AC-DC interconnected power grids, it is increasingly important to ensure the voltage stability of interconnected systems. In this paper, a continuous power flow algorithm for voltage-source converter (VSC) AC-DC system considering static load characteristics is proposed. It establishes an index for evaluating voltage stability based on the load margin and identified the weak region of the system. The effects of load model changes on voltage stability (VS) are analyzed in various scenarios. The relationship between DC control mode and system VS is further considered. The effectiveness of the proposed method is verified by an improved 10-node example.