南非Cape Town输电网络无功功率优化研究

Reactive Power Optimization Study on Transmission System in Cape Town, South Africa

摘要: 本文对南非Cape Town的400 kv和765 kv的输电网络的无功功率优化进行了可行性研究。由于输电距离长，这个系统中存在着不可忽视的无功功率。适当的无功潮流和无功电源的整体性能管理是电力传输系统的一个组成部分，因为它直接影响到系统的输送容量。本文将为此输电网络提供最佳的SVC电压的具体建议设置点和下垂设置、分接开关的参考值和分流器开关原理。采用的研究方法是将2006年作为案例分析的一个起点，对本系统的无功功率进行了分析，建立一个基准，以便对未来几年电网的无功功率进行对比分析。两个用来分析比对的算例是2009年和2012年该系统的无功功率流动情况。研究的结果解释了此系统无功功率产生的原因和怎样优化无功功率，并根据基准对2009年和2012年系统的稳态状况进行了分析。

Abstract: This paper conducts a study with the view of optimizing the reactive power flow on 400 kV and 765 kV Transmission Lines in the Cape Regions, South Africa. The power flowing on the system has a significant reactive component due to the long transmission distances. The appropriate flow of reactive power and the management of VAr sources are essential in the overall performance of this part of the system since it impacts directly on the available levels of supply capacity. The report will provide specific recommendations on optimal SVC voltage set-points and droop settings, tap-changer reference values and shunt device switching philosophy. As a starting point, the reactive power flow in the year 2006 was examined to establish a “base case” against which “future year” cases could be referenced. Two future dates were considered in the analysis: 2009 and 2012. Results show the reason why a VAr originates in a network and how to deal with these problems. The flow of steady-state reactive power on the system was analysed in 2009 and 2012.