中国电机工程学报2017，Vol.37Issue(9)：2551-2560,10.DOI:10.13334/j.0258-8013.pcsee.160599
多端柔性直流配电网接地方式设计
Grounding Method Design of Multi-terminal Flexible DC Distribution
摘要
Abstract
Multi-terminal flexible DC distribution is a new application form of combination of voltage source converter based high voltage direct current (VSC-HVDC) and distribution system. This distribution technology constructs a cross-distribution-areas low-voltage DC interconnected system using multi-terminal voltage source converter (VSC), and implements adaptive power flow transferring supply among distribution areas according to distribution transformers capacity ratio using optimized droop control. Zero-sequence steady equivalent circuit of VSC adopted was derived and calculation formula of zero-sequence grounding current was obtained. By analyzing steady zero-sequence grounding current of different DC-side grouding methods, analyzing filtering efficiency & common mode voltage of different AC-side grouding methods, a mode of AC filter direct grounding and DC capacitor ungrounding was proposed to achieve an optimal steady runing condition. A multi-terminal flexible DC distribution simulation model of 4-distribution-areas equivalent-network was established based on PSCAD/ EMTDC. Single-phase grounding fault at AC valve side and DC monopole grounding fault were set as typical transient fault scenes, characteristics of fault current of DC/AC side, DC voltage fluctuation and fault-recovery characteristic etc. were comparatively analyzed, results verified chose grounding method also achieve a beneficial transient fault characteristics.关键词
多端柔性直流配电网/接地方式/零序入地电流/稳态运行特性/故障暂态特性Key words
multi-terminal flexible DC distribution/grounding method/zero-sequence ground current/steady state characteristic/fault transient characteristics分类
信息技术与安全科学引用本文复制引用
吴峻,武迪,朱金大,洪莎莎,骆健,俞拙非,董长城..多端柔性直流配电网接地方式设计[J].中国电机工程学报,2017,37(9):2551-2560,10.基金项目
国家重大科技专项(2016YFB0901805) （2016YFB0901805）
南瑞集团公司科技项目(524606150143). National Science and Technology Major Project (2016YFB0901805) （524606150143）
Nari Group Corporation Technology Program (524606150143). （524606150143）
