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.

地区电力系统供电能力评估

随着电力系统规模不断增大、运行特性趋于复杂及用电负荷逐步增长,电力系统供电能力评估研究逐步由较大的省级电力系统延伸到相对较小的地区电力系统。地区电力系统供电能力能够反映该系统的可靠性、供电薄弱环节和与其它地区电力系统间的互联强度,可以在相当程度上据此来判断电力系统结构的优劣。传统的地区电力系统供电能力评估方法在计算时有可能遗漏一些重要的风险状态,如此得到的计算结果可能会有较大的误差。在此背景下,将地区电力系统供电能力计算描述为非线性有约束优化问题。之后,引入了基于支路开断分布因子的N-1预想事故分析方法,并采用差异进化算法来求取地区电力系统最大供电能力。最后,采用广东电力系统的两个实际算例来说明所提出的模型和方法的可行性与有效性。