安全域视角下的有功安全校正优化控制方法

传统基于灵敏度的电力系统有功安全校正控制方法多建立在相互孤立的线路负载率指标上,在处理多支路潮流越限时可能存在调节反复、低效的问题。文中将安全域理论应用于安全校正控制,分析了传统方法存在问题的原因,并通过对系统当前运行状态在高维空间中各方向上的安全距离进行整体评判,给出了最优控制的指导向量。在此基础上,提出了安全距离灵敏度指标,对各发电机组根据其安全距离灵敏度及实际调节能力进行反向配对,按所得的机组操作序列选择机组对,代入校正控制的线性规划模型中进行求解。IEEE 39节点系统和某地区电网算例的仿真结果表明,文中提出的有功校正控制方法切实可行,尤其在处理多支路过载时更加直观、高效,并且能兼顾系统中其他支路的安全裕度,避免反复调整。

Optimization Control Strategy for Active Power Correction from Perspective of Security Region

Traditional sensitivity method for active power corrective control are often based on the isolated indices of line loading rates, which may cause repeated or inefficient adjustment. The theory of security region is applied in analysis of problems in traditional methods. In the security region, the security distance from the operation point to the boundaries is obtained to quantify the security margin and provide guidance for optimal security control. On this basis, the concept of security distance sensitivity is proposed. Then, the generators are matched to opposite equal quantities according to their security distance sensitivities and actual adjustable abilities. Finally, the generators are selected in sequence prior to solving the linear programming problem. Simulation results of IEEE 39-bus system and a certain power grid show that this method is more intuitive and effective than the traditional one when dealing with multi-overload cases. In addition, as the security margin of other branches could also be considered in this method, repeated adjustment can be avoided.