基于连续潮流和模态分析的电压稳定分析

Voltage stability analysis based on continuation power flow and modal analysis

针对电压稳定分析的连续潮流和模态分析方法进行研究,详细推导了连续潮流和模态分析的具体算法。连续潮流通过局部参数化和预测校正的方法克服其在拐点的奇异性,模态分析则给出节点参与因子和支路参与因子用于标识电压稳定性。结合某省网进行实例分析,证明了节点参与因子和P-U曲线在反映电压稳定性上具有一致性。计算结果表明:连续潮流方法可快速、准确求得系统最大负荷点,判断系统稳定裕度;模态分析方法可以很好定位电压稳定的薄弱区域。

The continuation power flow and modal analysis approach for power system VSA（Voltage Stability Analysis） is presented and the key algorithms are derived. Local parameterization and prediction-correction of continuation power flow approach are used to overcome its singularity at inflexion. Modal analysis provides the participating factors of nodes and lines to identify the voltage stability. Simulative results for a provincial grid indicate that,the nodal participating factors and P-U curves have consistency in voltage stability analysis ,the continuation power flow method calculates the maximum load level and determines the voltage stability margin quickly ,and the modal analysis locates the weak regions of power grid well.