Performance of UK Distribution Networks with single-phase PV systems under fault
Performance of UK Distribution Networks with single-phase PV systems under fault
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英国单相光伏系统配电网故障时的性能
DOI：
10.1016/j.ijepes.2019.05.077
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发表时间：
2019
影响因子：
5.2
通讯作者：
Bhagavathy S
中科院分区：
文献类型：
--
作者：
Bhagavathy S
故障是影响配电网动态性能的重要因素。随着光伏贡献的预测增加，了解光伏对配电网的影响至关重要。然而，有很少的工作发表，解决光伏系统对配电网的动态性能的影响。在配电层连接的大多数光伏系统本质上是单相的。本文提出了一个通用的单相动态光伏发电模型，包括保护机制。这使得多个单相光伏系统的配电网络的动态性能的评估。本文利用所建立的模型分析了故障对光伏逆变器输出的影响。分析了故障时PV对网络性能的影响。还讨论了采用不同法规的影响，即G-83，IEEE 1547：2018，IEC 61727和VDE 0126-1-1。结果表明，光伏系统的存在不会显着影响配电网的性能在故障期间。此外，在此电压水平下不会出现通常担心的保护协调丢失问题。远离PV终端的故障将在0.2 s内清除。这表明G-83规定的0.5 s断开延迟是适当的。然而，低于G-83中规定的电流值的欠压断开的截止电压将使更多的光伏系统在故障期间保持连接，并避免不必要的发电损失。本工作中使用的网络是英国配电网和保护方案的代表。因此，该分析的结果可扩展到使用标准保护的任何辐射状配电网络，例如低压配电网络中的熔断器和继电器。
Faults are a major concern to the dynamic performance of distribution networks. With the predicted increase in PV contribution, it is vital to understand the impact of PV on the distribution network. However, there is very little work published that address the impact of PV systems on the dynamic performance of distribution networks. Most PV systems connected at the distribution level are single-phase in nature. A generic single-phase dynamic PV model, including the protection mechanism, is presented in this paper. This enables the evaluation of the dynamic performance of distribution networks with multiple single-phase PV systems. The paper analyses the impact of faults on the PV inverter output using the models developed. The impact of PV on the network performance during fault is then analysed. The implications of the adoption of different regulations, viz. G-83, IEEE 1547:2018, IEC 61727 and VDE 0126-1-1, are also discussed. The results show that the presence of PV systems does not significantly affect the performance of the distribution network during faults. Also, the usual concern of loss of protection co-ordination does not occur at this voltage level. Faults that are far from the PV terminals would be cleared within 0.2 s. This indicates that the disconnection delay of 0.5 s as stipulated by G-83 is appropriate. However, a lower cut-off voltage for under-voltage disconnection than the current value stipulated in G-83 would enable more PV systems to stay connected during fault and avoid unnecessary loss of generation. The network used in this work is a representative of distribution networks and protection schemes in the UK. The results of this analysis are therefore extendable to any radial distribution network that uses standard protection, e.g. fuses and relays in low voltage distribution networks.
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期刊：
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