分区柔性互联城市电网的最大供电能力分析

Total power-supply capability of urban power grid with flexibly-interconnected partitions

对比现有电网分区运行模式与新型柔性互联运行模式,并阐述柔性直流分区互联装置的基本工作模式;介绍分区互联装置的基本结构,并研究装置在分区间有功支援与动态无功支撑过程中的工作原理;考虑电网N-1静态安全性与暂态电压稳定性,提出分区柔性互联城市电网最大供电能力的定义与模型,并给出一种简化的逼近求解算法。某电网示范工程实际算例验证了所提方法的正确性;与传统分区运行相比,柔性互联后最大供电能力得到提升。

The novel flexibly-interconnected operating modes of power grid is compared with the present partitioned operating mode and the basic working modes of flexible DC inter-partition connecting device are analyzed. The basic structure of inter-partition connecting device is introduced and its working principles during the active-power support and the dynamic reactive-power support among partitions are investigated. With the consideration of N-1 static security and transient voltage stability of power grid, the definition and model of total power-supply capability of urban power grid with flexibly-interconnected partitions are proposed and a simplified approximation method is given to solve it. Case study for a pilot project verifies the correctness of the proposed method. Compared with the traditional partitioned operation,the total power-supply capability of flexibly-interconnected partitions is enhanced.