电网运行风险在线评估中基于灵敏度分析的负荷削减模型

传统负荷削减模型通常采用全局寻优得到负荷削减范围,难以满足电网运行风险在线评估的时效性要求。为解决现有的负荷削减模型存在的问题,提出了一种基于灵敏度分析的负荷削减模型,通过计算各支路对母线节点的灵敏度,筛选对越限支路潮流影响显著的母线节点作为负荷削减范围,将全局寻优转换为局部寻优。综合考虑负荷重要程度和计及设备电气耦合关系的临近原则,以各类负荷削减量加权求和最小为目标,采用原对偶内点法计算负荷削减量。所提模型可在保证负荷削减结果正确的前提下,大幅提高计算效率。以IEEE 300节点等系统为例,验证了所提负荷削减模型的正确性和高效性。

Load shedding model based on sensitivity analysis in on-line power system operation risk assessment

The traditional load shedding models usually use global optimization to get the load shedding region, which hardly meets the requirement of timeliness in on-line power system operation risk assessment. In order to solve the problems of the present load-shedding models, a load shedding model based on sensitivity analysis is proposed. By calculating the sensitivity of each branch to each bus, the buses having remarkable influence on the power flow of over-load branches are obtained as the load shedding range, which can convert the global optimization to local optimization. The importance of load bus and adjacency principle regarding the electrical coupling relationship are comprehensively considered, the minimum weighted sum of reduction of different kinds of loads is taken as the object, and the load reduction is calculated by the primal dual interior point method. The proposed model can greatly improve the calculating efficiency on the premise of ensuring correct load shedding results. Taking IEEE 300-bus system and other systems as study cases, the correctness and high-effectiveness of the proposed load shedding model are demonstrated.