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随着柔性交流输电系统(flexible AC transmission system,FACTS)的广泛发展,研究其装置容量限制对电压稳定的影响具有重要意义。分析无功补偿设备输出达到容量极限时,可能出现引起电压失稳的极限诱导分岔;提出容量达到极限时判定发生极限诱导分岔的新判据,该判据只需估算矩阵谱半径的上下界,避免矩阵求逆和特征值等运算,在原理和技巧上有别于传统方法,具有原理清晰、计算量小的特点。基于上述判据探讨识别极限诱导分岔和鞍结分岔的综合方法,最后给出提高电压稳定裕度新的控制策略。该文以静止同步补偿器(static synchronous compensator,STATCOM)为例,在IEEE-30节点算例中验证所提方法的正确性和有效性。
With the widespread development of flexible AC transmission system (FACTS), it is of great significance to study the influence of device capacity limitation on voltage stability. When the output of the reactive power compensation device reaches the capacity limit, the limit induced bifurcation causing the voltage instability may occur. A new criterion for determining the limit induced bifurcation when the capacity reaches the limit is proposed. The criterion only needs to estimate the upper and lower limits The world, to avoid the matrix inversion and eigenvalue calculation, the principle and skills are different from the traditional method, with a clear principle, a small amount of calculation. Based on the above criteria, an integrated method for identifying the ultimate induced bifurcation and the saddle-knot bifurcation is discussed. Finally, a new control strategy is proposed to improve the voltage stability margin. In this paper, a static synchronous compensator (STATCOM) is taken as an example to verify the validity and validity of the proposed method in the IEEE-30 node example.