Impact on Distribution System Protection with the Integration of EG on the Distribution Network

Jane Courtney, Aaron McDonnell
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引用次数: 3

Abstract

A significant increase in EG connections on the distribution network over the past decade in Ireland has presented challenges to the Distribution System Operator (DSO). The connection of EG can cause co-ordination of Distance protection to be altered and has resulted in variations in short circuit levels. Multidirectional power flow has been introduced into a Distribution system that was not designed for the direction change in current flow. The impact of connecting EG to a typical 38 kV Distribution Network was demonstrated as part of this study. Increasing fault levels and protection co-ordination selectivity problems were identified when the network was fed as a closed network. The increase in short circuit fault levels was evident when the fault contribution from the EG was considered. This increase in short circuit fault current could be a concern if EG is installed in an area where the maximum current rating of the switchgear could be exceeded. The co-ordination of Distance protection IEDs were also affected when EG was connected. Case studies on a typical Distribution Network were presented as part of this study. The impact that EG can have on the short circuit fault levels and the co-ordination of Distance protection when the network is feeding as a closed loop network was identified. When incorporating EG to a typical 38 kV Distribution Network, considerations must be made to ensure that the connection of the EG does not inhibit the performance of the overall protection system. A protection review of the network is required before any EG is connected. The issues identified the miscoordination of Distance protection IEDs. A revision of current IED settings in the vicinity of the installed EG and the addition of duplicate protection IEDs may be required.
配电网集成EG对配电网保护的影响
在过去的十年中,爱尔兰配电网络上的EG连接显著增加,这给配电系统运营商(DSO)带来了挑战。EG的连接会导致距离保护的协调改变,并导致短路水平的变化。在配电系统中引入了多向潮流,而这种潮流并不是为电流方向变化而设计的。将EG连接到典型的38千伏配电网的影响作为本研究的一部分进行了演示。当网络作为封闭网络馈电时,发现了故障水平增加和保护协调选择性问题。当考虑EG的故障贡献时,短路故障水平的增加是明显的。如果EG安装在可能超过开关柜最大额定电流的区域,则短路故障电流的增加可能是一个问题。当连接EG时,距离保护简易爆炸装置的协调也受到影响。一个典型的分销网络的案例研究是本研究的一部分。确定了当电网作为闭环馈电时,EG对短路故障水平和距离保护协调的影响。当将EG并入典型的38kv配电网时,必须考虑确保EG的连接不会抑制整个保护系统的性能。在连接任何EG之前,需要对网络进行保护审查。这些问题确定了距离保护简易爆炸装置的不协调。可能需要修改已安装的爆炸装置附近现有的简易爆炸装置设置,并增加重复保护的简易爆炸装置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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