电网技术2017，Vol.41Issue(7)：2092-2098,7.DOI:10.13335/j.1000-3673.pst.2016.2643
混合式直流断路器在柔性直流电网中应用初探
Potentials of Hybrid HVDC Circuit Breakers'Application to MMC-HVDC Grid
摘要
Abstract
High voltage direct current (HVDC) grid based on modular multilevel converter (MMC) is one of the most promising transmission technologies toward future power grids. However, the MMC-HVDC grid poses a great challenge of DC-fault clearing difficulty. By comparing three isolation techniques of DC faults, the hybrid HVDC circuit breaker (DCCB) is chosen to isolate DC faults. Based on a differential-current fault detection technology, a DC grid protection scheme is proposed, which includes a DC transmission line protection, a DC busbar protection that can consider the distributed line capacitive current. Then the principle of protection parameter settings is discussed. A four-terminal MMC-HVDC grid is used to verify validity and feasibility of the proposed hybrid DCCB based scheme on PSCAD/EMTDC platform. The results show that the proposed differential protection scheme can exhibit proper selectivity and speed, and the hybrid DCCBs can clear DC faults within several milliseconds.关键词
柔性直流电网/直流故障/混合式高压直流断路器/差动保护Key words
MMC-HVDC grid/DC fault/hybrid DCCB/differential protection分类
信息技术与安全科学引用本文复制引用
彭发喜,汪震,邓银秋,郑超,宋云亭..混合式直流断路器在柔性直流电网中应用初探[J].电网技术,2017,41(7):2092-2098,7.基金项目
国家重点研发计划项目(2016YFB0900903) （2016YFB0900903）
国家电网公司 2014 年基础性前瞻性科技项目.Project Supported by the National Key Research and Development Program of China (2016YFB0900903) and the 2014 State Grid Corporation of China (SGCC) Prospective Research Project. （2016YFB0900903）
