Eliyan Tamer, Wadie Fady
Faculty of Engineering at Shoubra, Benha University, Cairo, 11629, Egypt.
Department of Electrical Power & Machines Engineering Department, The Higher Institute of Engineering at El-Shorouk City, Alshorouk Academy, Cairo, 11837, Egypt.
Sci Rep. 2023 Aug 22;13(1):13655. doi: 10.1038/s41598-023-40768-4.
Various overvoltage mitigation schemes were used in literature in suppression of switching overvoltages in wind farms. However, the evaluation of how the effectiveness of these mitigation techniques would vary with the change of the wind farm topology is still un-explored territory. The main aim of this paper is to study the effectiveness of four mitigation schemes while using SF6 circuit breaker namely; R-L smart choke, R-C snubber circuit, surge capacitor and pre-insertion resistor (PIR) were studied in four different wind farm topologies; radial, single-sided ring, double-sided ring and star topologies. The topologies were based on a real wind farm located in Zaafrana, Egypt. The results showed that R-L choke to be the most effective scheme for all topologies followed by PIR, R-C snubber and surge capacitor schemes respectively. Their percentage of reduction of overvoltage ranged from 62 to 84% for R-L choke, 33-67% for PIR, 8-25% for R-C snubber circuits and 4-15% for surge capacitors. Also, it was shown that the change of the wind farm topology didn't affect the order of effectiveness of the mitigation schemes such that R-L remained the most effective and surge capacitor the least effective for all topologies.
文献中使用了各种过电压抑制方案来抑制风电场中的操作过电压。然而，这些抑制技术的有效性如何随风电场拓扑结构的变化而变化，仍是一个尚未探索的领域。本文的主要目的是研究四种使用SF6断路器的抑制方案的有效性，即：R-L智能扼流圈、R-C缓冲电路、浪涌电容器和预插入电阻器（PIR），并在四种不同的风电场拓扑结构中进行研究，即：径向、单侧环形、双侧环形和星形拓扑结构。这些拓扑结构基于位于埃及扎夫拉纳的一个实际风电场。结果表明，对于所有拓扑结构，R-L扼流圈是最有效的方案，其次分别是PIR、R-C缓冲电路和浪涌电容器方案。它们的过电压降低百分比范围为：R-L扼流圈为62%至84%，PIR为33%至67%，R-C缓冲电路为8%至25%，浪涌电容器为4%至15%。此外，结果还表明，风电场拓扑结构的变化并不影响抑制方案的有效性顺序，即对于所有拓扑结构，R-L仍然是最有效的，而浪涌电容器是最无效的。
