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中文摘要：
提出了一种电压稳定裕度约束无功优化新方法，通过调节系统的控制变量，能真正有效地提高系统的静态电压稳定裕度，同时取得较小的网损．该方法将电压稳定裕度约束无功优化问题分解为非线性无功优化、电压稳定裕度及其对控制变量的灵敏度分析两个子问题，通过两者的交替求解实现寻优．前者采用非线性原对偶内点法求解，后者则以连续潮流计算为基础．该方法计算速度快，对多种系统具有一定的普适性．在IEEE14、30、118节点系统的试验结果验证了它的有效性，并发现一个系统在特定的负荷增长方式下，由于无功潮流的改变其分岔类型可能会在极限诱导分岔和鞍结分岔之间转换．
英文摘要：
This paper proposes a new algorithm for the reactive power optimization with the constraints of voltage stability margin, by which the static voltage stability margin is effectively increased and the active power loss is re- duced via the adjustment of control variables. In this method, the reactive power optimization problem is decom- posed into two sub-problems. One is the nonlinear reactive power optimization and the other is the voltage stability margin and its sensitivity analysis of control variables. The two sub-problems are then alternately solved to obtain the optimal solution, respectively with the nonlinear primal-dual interior-point method and the continuous power flow method. The proposed method is of high calculation speed and good universality for various real systems. The applications to IEEE 14-bus, 30-bus and l l8-bus systems demonstrate that the proposed method is effective and that, when the load increases in a particular mode, the bifurcation type of a system may change between a limit-in- duced one and a saddle-node one due to the change in reactive power flow.
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