分布式电源对配网继电保护影响及综合改进保护方案

谢民; 王同文; 徐靖东; 邵庆祝; 于洋; 张炜

引用本文:	谢民,王同文,徐靖东,等.分布式电源对配网继电保护影响及综合改进保护方案[J].电力系统保护与控制,2019,47(19):78-84.
	XIE Min,WANG Tongwen,XU Jingdong,et al.Effect of distributed generation on relay protection of distribution network and comprehensive improvement of protection scheme[J].Power System Protection and Control,2019,47(19):78-84

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分布式电源对配网继电保护影响及综合改进保护方案
谢民¹,王同文¹,徐靖东²,邵庆祝¹,于洋¹,张炜¹
(1.国网安徽省电力有限公司，安徽合肥230022;2.西安交通大学电力设备电气绝缘国家重点实验室，陕西西安 710049)

摘要:

随着大规模分布式电源的接入，配电网的运行方式、潮流特性及短路电流等都将发生很大变化，这对配电网线路的反时限过电流保护产生较大影响。在传统电力系统反时限电流保护基础上，分析了分布式电源在故障发生时的助增电流对配电网反时限保护的影响机理和特性，提出一种利用电压因子修正的综合改进反时限过电流保护方案，以改善相邻线路保护间的配合特性来满足分布式电源接入下的继电保护要求。在PSCAD／EMTDC环境中建立了仿真模型，验证了所提方案选择性和速动性的有效性。

关键词: 分布式电源配电网继电保护助增电流电压因子修正

DOI：10.19783/j.cnki.pspc.181524

分类号:

基金项目:国家自然科学基金项目资助(51277143);国网安徽省电力有限公司科技项目(52120017001G)

Effect of distributed generation on relay protection of distribution network and comprehensive improvement of protection scheme

XIE Min¹,WANG Tongwen¹,XU Jingdong²,SHAO Qingzhu¹,YU Yang¹,ZHANG Wei¹

(1. State Grid Anhui Electric Power Co., Ltd., Hefei 230022, China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract:

With the access of large-scale distributed generators, the operation mode, power flow characteristics and short-circuit current of distribution network will change greatly, which has a great impact on the reverse-time over-current protection of distribution network lines. Based on the traditional inverse-time current protection of power system, this paper analyses the mechanism and characteristics of the influence of the auxiliary current of distributed generation on the inverse-time protection of distribution network when the fault occurs. And a comprehensive improved reverse-time over-current protection scheme using voltage factor correction is proposed. It meets the requirements of relay protection under the access of distributed generation. A simulation model is established in PSCAD/EMTDC environment to verify the effectiveness of the selectivity and speed of the proposed scheme. This work is supported by National Natural Science Foundation of China (No. 51277143).

Key words: distributed generation distribution network relay protection augmented current voltage factor correction

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