城市电网输配全局最大供电能力分析

Global Maximum Power Supply Capability Analysis of City Power Grid

城市电网是包含输电网和高压配电网的全局电力系统。传统电网供电能力分析中,往往分别对输电网和配电网单独求解,割裂了输配电网之间的统一协调关系。针对这一问题,提出了城市电网全局最大供电能力分析模型。首先,针对输电网结构特点,结合改进的潮流计算模型,采用线性规划法求解输电网满足N-1约束的安全供电能力;其次,针对高压配电网的结构和负荷特性,建立基于需求侧分析的高压配电网最大供电能力分析模型;最后,进行电能阻塞分析,求取城市电网全局最大供电能力。通过算例证实了该分析体系能有效计算城市电网的全局最大供电能力,定位电网整体供电能力的薄弱环节,为电网规划提供参考数据。

City power grid is a global system containing transmission and high-voltage distribution networks. Traditional power supply capability analysis always analyses the transmission and distribution network respectively, separating the harmonious relationship between them. To solve this problem, this paper proposes an analysis model of city power grid global maximum power supply capability. Firstly, based on the characteristics of the structure of transmission network, the model of safety power supply capability of transmission network is established according to the improved power flow calculation model and is solved with linear programming. This model satisfies security constrains of N-1 contingency analysis; secondly, according to the structure and load characteristics of high-voltage distribution network, a maximum power supply capability analysis model of high-voltage distribution grid based on demand analysis is established in this paper; finally, the power congestion is analyzed to calculate the global maximum power supply capability of city power grid. Conformed with simulation of an example, the analysis system can effectively calculate global maximum power supply capability of city power grid, locate the weak link limiting global supply capacity and provide data reference for power network planning.