A Steady-State Contingency Analysis of the SADC Regional Grid Using the N-1 Criterion

Southern Africa has experienced electric power deficits over the last decade. This has been due in part to the member countries＇ inadequate electrical power supply system, as well as load growth in areas which were not adequately planned for. This has induced the formation of organizations such as SADC （Southern African Development Community） and SAPP （Southern African Power Pool） that have the common goal of achieving development and economic growth in the region which comprises of 15 member countries. This paper presents results from a security analysis of the region＇s electric power supply system using a baseline level of performance. This was carried out by performing a steady-state contingency analysis on a SADC power network model subject to the N-1 criteria which expresses the ability of the power network to experience a contingency without causing an overload or failure in any other part of the network. Simulations were carried out using DigSilent.

柔性互联配电台区联合优化配置

针对配电网中新增的分布式电源、电动汽车快充站等新型源荷储元素,提出了一种考虑“N−1”转供对于配电设备容量配置要求的台区柔性互联系统优化配置方法。首先,简要介绍了互联系统的基本概念与应用前景;然后,以固定资产投资与设备电能损耗构成的综合成本最小为目标,建立了包含“N−1”转供约束的互联系统优化配置模型;最后,通过相关算例的对比分析,验证了互联系统在增强供电可靠性、提高设备容量利用率、降低配电系统损耗、提升分布式电源接纳能力等方面的有效性。