基于负荷曲线分段的配电网无功优化策略

针对电网负荷的波动性,采取分时段无功补偿策略对改善电压质量和保证运行经济性具有重要实用价值。首先,基于典型日负荷曲线建立了负荷曲线的优化分段模型。在此基础上基于平均节点电压偏移灵敏度指标和网损灵敏度指标建立了无功补偿点的筛选确定方法,并以平均电压偏移和网损最小为优化目标建立无功补偿优化模型。其次,通过基于分解的多目标优化算法对所建立优化模型分别进行求解,可得出负荷曲线的分段点及每个负荷分段下对应的最优补偿方案。最后,以IEEE 33节点配网系统和实际电网仿真分析,验证了所建立优化策略的可行性和有效性。

Reactive Power Optimization Strategy of Distribution Network based on Segmental Load Curve

In view of the fluctuation of power grid load, adopting time division reactive power compensation strategy has important practical value for improving voltage quality and ensuring operation economy. Firstly, based on the typical daily load curve, the optimal segmentation model of load curve is established. On the basis of this, the screening and determination method of reactive power compensation node is established based on the average node voltage deviation sensitivity index and the active power loss sensitivity index, and the reactive power compensation optimization model is established with the minimum average voltage deviation and minimum active power loss as the optimization objective. Through multi-objective evolutionary algorithm based on De-composition to solve the established optimization model respectively, the segment nodes of the load curve and the corresponding optimal compensation scheme under each load segment can be obtained. Finally, the feasibility and effectiveness of the proposed optimization strategy are verified by IEEE 33 bus distribution system and actual power grid simulation.