多馈入直流系统无功补偿选址研究

无功补偿是提高电压稳定性的有效手段之一。在多馈入直流系统中，无功补偿问题更加复杂，传统电压稳定性指标无法有效地表示多馈入系统的电压和无功功率之间的关系。从多馈入相互作用因子、节点权重和时域计算的角度出发，综合考虑静态和动态电压稳定性，提出了用于判断多馈入系统电压稳定性的新指标—多馈入电压稳定因子。在此基础上提出无功补偿选址方案：先利用多馈入相互作用因子对应的临界阻抗的交集判定电压薄弱区域，再根据电压薄弱区域和多馈入电压稳定因子大小综合排序选出区域内的优先补偿节点。仿真结果验证了指标的有效性和准确性。

Site Selection for Reactive Power Compensation of Multi-Infeed HVDC systems

Reactive power compensation is one of the effective means to improve voltage stability. The reactive power compensation problem of multi-infeed HVDC systems is more complex as the conventional voltage stability index can not effectively represent the relation between voltage and power of multi-infeed HVDC systems. The multi-infeed voltage stability index (MVSI) is proposed for judging the voltage stability of multi-infeed systems, which is based on multi-infeed interaction factor(MⅡF), node weight and time domain analysis. Furthermore, a site scheme is proposed for reactive power compensation. Firstly, the voltage weak areas are identified with the help of critical impedance. Then, the priority compensation node is selected on the basis of voltage weak areas and MVSI. The simulation results proved the validity and accuracy of the index.