摘要
IIDG(逆变型分布式电源)的大量接入使得传统电网的结构发生了巨大的改变,IIDG并网侧变压器中性点接地方式会对系统的故障特性造成一定的影响。当配电网发生故障时,IIDG提供的故障电流与传统发电机相比有较大不同。根据IIDG的运行特性,建立了在非对称故障下短路电流的计算模型,对不同情况下的系统故障电气量进行详细的理论分析,进一步提出接地电阻的阻值选取方案。区域电网实例的数字仿真结果验证了理论分析的正确性以及接地电阻取值方案的实用性。
The massive access of inverter interfaced distributed generation(IIDG)brings about drastic changes in the structure of the traditional power grid. The neutral grounding mode of the transformer on IIDG-integrated side to some extent affects the fault characteristics. In the case of distribution network failure,the fault current from IIDG is quite different from that of traditional generators. According to the operation characteristics of IIDG,the calculation model of short-circuit current under asymmetric fault is established,and the detailed theoretical analysis of the system fault electrical quantities under different conditions is carried out to propose a limit value selection scheme of grounding resistance. The results of digital simulation on regional power grid verify that the theoretical analysis is correct,and the value selection scheme of the grounding resistance is practicable.
作者
高美金
诸言涵
张啸
张波
房鑫炎
GAO Meijin;ZHU Yanhan;ZHANG Xiao;ZHANG Bo;FANG Xinyan(State Grid Zhejiang Economic Research Institute,Hangzhou 310008,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《浙江电力》
2022年第3期11-19,共9页
Zhejiang Electric Power
基金
国网浙江省电力有限公司科技项目(5211JY19000Q)。
关键词
逆变型分布式电源
配电网
故障特性
接地电阻
inverter interfaced distributed generation
distribution network
fault characteristics
grounding resistance