分布式电源接入对配电网电流保护的影响分析

Analysis of Influence of Distributed Generation Supply Access on Current Protection of Distribution Network

摘要: 大量分布式电源接入将改变传统配电网的潮流,对配电网电流保护造成影响。本文在对传统配电网电流保护系统进行分析的基础上，深入分析了分布式电源接入对配电网电流保护系统带来的影响；针对分布式电源接入可能带来的电流保护灵敏度降低或保护系统出现误动及拒动等问题，提出了含分布式电源场景下配电网电流保护配置和参数整定的解决方案，并以深圳市某含分布式电源的10 kV区域配电网为例，分析了分布式电源接入可能造成保护系统误动作等问题，并验证了所提解决方案的有效性，为含分布式电源的配电网保护系统的整定提供有意义的参考。

Abstract: A large number of distributed generation (DG) access will change the structure of the traditional distribution network and affect the current protection of distribution network. Based on the analysis of the current protection system in traditional distribution network, this paper analyzes the influence of the DG penetration on the current protection system of distribution network. Focusing on the problems include current protection sensitivity reduction or protection system malfunction and refusal with DG penetration, this paper proposed a solution for current protec-tion configuration and parameter tuning for distribution network penetrated with DG. Also, taking the distribution network with DG in Shenzhen 10 kV regional as an example, the paper analyzes the malfunction of the protection system caused by DG penetration. Then, the effectiveness of the proposed solution is verified and results reveal that the proposed solution can provide meaningful reference for distribution network protection system penetrated with DG.