考虑时序特性的主动配电网静态安全分析

主动配电网(ADN)是实现间歇性绿色能源高效利用和网络优化运行的有效技术方案。静态安全分析是调度过程中提高系统运行安全性的重要工作。文中计及分布式电源、储能、可平移负荷,考虑ADN运行的时序特性,提出适用于主动配电网N-1支路故障的静态安全分析方法。首先建立了适用于ADN静态安全分析的元件时序模型和安全指标;其次考虑故障发生时段和故障期间网络运行状态两方面的时序性,提出一种ADN静态安全分析方法,该方法计及了ADN的孤岛运行与主动管理能力,以孤岛功率平衡和网络潮流约束为准则得出切负荷值,定量评估出不同时段、不同支路和系统总体的安全性,以找到系统运行的薄弱环节;最后通过算例的基本分析结果和多场景比较,验证了所提出安全指标和静态安全分析方法的正确性和有效性。

Static Security Analysis of Active Distribution Network Considering Time Sequence Characteristics

Active distribution network(ADN)is an effective technical solution to realize efficient utilization of intermittent green energy and optimized operation of network. Static security analysis is the important work in the dispatching process to improve the operational security of system. Considering distributed generators, energy storage systems and shiftable loads, the static security analysis method of N-1 branch fault in ADN is proposed, which is based on the time sequence characteristics of ADN. Firstly, the time sequence models of elements and security indices applicable to static security analysis of ADN are established. Then, based on two aspects of time sequence, i. e. the fault occurrence period and network operational status during fault time, the ADN static security analysis method is proposed. This method takes island power balance and network power flow constraints as criteria to get the value of load shedding considering the ADN''s capabilities of island operation and active management. The security of different periods, different branches and system is evaluated quantitatively to find the weak link of system. Finally, by basic analysis results and multi-scenario comparison, the correctness and effectiveness of the proposed security indices and static analysis method are verified. This work is supported by National Natural Science Foundation of China(No. 51407113)and Shanghai Engineering Research Center of Green Energy Grid-connected Technology(No. 13DZ2251900).