基于连续潮流法的含双端VSC-HVDC交直流系统负荷裕度分析

Load margin analysis of hybrid AC/DC system with two terminal VSC-HVDC using continuous power flow method

为了分析含双端VSC-HVDC交直流系统的静态电压稳态特性,结合交替求解法和连续潮流法给出一种交直流连续潮流法。根据初始输入得到初始解确定负荷增长方向,引入负荷裕度参数。通过调节VSC-HVDC的控制策略,最终得到系统不同情况下的负荷裕度,采用左特征向量乘子法对系统进行负荷裕度灵敏度计算。对含双端VSC-HVDC的IEEE39节点系统和IEEE118节点系统进行建模仿真,得出了系统负荷裕度以及负荷裕度灵敏度近似线性的变化规律。直流线路功率流向对系统负荷裕度的影响相反,验证了方法的有效性。

In order to analyze the static voltage steady state characteristics of a two terminal VSC-HVDC AC/DC system, the AC/DC continuation power flow method is proposed by combining alternating solution method with continuation power flow method. The direction of the load growth is determined by initial solution from the initial input and the load power margin parameter is introduced. The different system load margin is gotten by adjusting VSC-HVDC control strategy, and the left eigenveetor multiplier method is used in the system load margin sensitivity calculation. Based on IEEE39 bus system and the IEEE 118 bus system with two terminal VSC-HVDC modeling and simulation, it is concluded that the changing rules of system load margin and load margin sensitivity are approximate linear. The impact of DC power flow on the system load power margin is contrary. The results verify that the proposed method is valid.