分布式电源对配电网继电保护的影响及评估方法

Evaluation Method for Impact of Distributed Electric Resources on the Relaying Protection of Distribution Network

在分析有源配电网故障电流特征的基础上,分析了分布式电源(distributed electric resources,DER)对配电网继电保护可能产生的影响。根据是否影响配电网继电保护的正确动作以及是否需要采取克服其影响的技术措施,将DER对配电网继电保护的影响程度分为没有实质性影响、有一定影响与严重影响3个级别。基于线路上DER输出的最大短路电流,提出了DER对配电网继电保护影响的评估方法。最后,结合示例证明了该方法评估DER对配电网继电保护的影响的有效性和实用性。

Based on the analysis of the characteristics of fault current, this paper analyzed how distributed electric resources impacted the relaying protection of distribution networks. According to the actual performances of the protections and the countermeasures need,the impact of the DER to the protection is classified as three levels, no substantial impact, moderate impact and serious impact. According to the maximum fault contribution of the DERs in a line, a simple assessment method is presented. To prove the feasibility and efficiency of this method, examples are given.