基于有功负荷注入空间静态电压稳定域的最小切负荷算法

A Minimum Load Shedding Calculation Algorithm Based on Static Voltage Stability Region in Active Load Power Injection Space

针对电力系统电压稳定控制中的切负荷量求解问题,提出基于有功负荷注入空间静态电压稳定域的最小切负荷量计算方法。首先给出该稳定域的2阶段求解方法,与传统基于拟合技术的求取方法相比,该方法通过聚类分析在保证计算精度的条件下减小了计算代价,同时可对临界点基于其局部切平面的法向量进行分类拟合,从而计及稳定域边界曲率的变化得到更加准确的边界估计。基于该稳定域提出最小切负荷量的计算方法,与基于灵敏度的连续线性规划法相比,该方法可利用全局信息给出最小切负荷量,并且在计算速度上具有优势。通过6节点算例的可视化稳定域计算结果说明2阶段求解方法的有效性,最后利用39节点系统验证该最小切负荷计算方法的准确性。

To solve the minimum load shedding calculation problem in the static voltage stability assessment of power system, a new algorithm based on static voltage stability region in active load power injection space was developed. In this paper, a two-stage calculation method of this stability region was proposed, it firstly used clustering analysis to reduce computational cost, and then classified critical points into individual groups to fit different hyper planes based on theirnormal vectors of local tangent planes. In this case, computation efficiency and curvature changes of stability boundary could be well taken into account. Furthermore, a minimum load shedding method was given based on stability region. Compared with successive linear programming method based on sensitivity analysis, algorithm gives smaller shedding value due to the global information of stability region, and its computation speed is much faster. A visualized example of stability region in active load power injection space based on the IEEE 6-bus system was used to verify the stability region calculation method. Finally, New England 39-bus system was used to validate the accuracy of proposed minimum load shedding computation method.