电力建设2017，Vol.38Issue(8)：73-79,7.DOI:10.3969/j.issn.1000-7229.2017.08.010
基于LCC-MMC的三端混合直流输电系统故障特性与控制保护策略
Fault Characteristics and Control & Protection Strategy of Three-Terminal LCC-MMC Hybrid HVDC Transmission System
洪潮 1时伯年 2孙刚 2张野 1杨健 1刘斌2
作者信息
- 1. 南方电网科学研究院,广州市 510080
- 2. 北京四方继保自动化股份有限公司,北京市 100085
- 折叠
摘要
Abstract
This paper studies the AC/DC fault characteristics and control & protection strategies of the three-terminal hybrid DC transmission system with line commutated converter (LCC)-modular multilevel converter (MMC) converters.Based on the analysis of the existing fault crossing control strategy,the coordination strategy of the minimum triggering angle control,the maximum modulation ratio of the MMC and the DC voltage deviation control of the inverter side LCC is proposed for the AC side fault.In order to solve the DC fault,the DC line fault current transient variable can be used to identify the fault location and break the fault by the DC circuit breaker by arranging the boundary condition of the current limiting reactor at both ends of the DC link,which can quickly isolate the DC link fault and narrow the scope of the impact of failure.Finally,a hybrid DC transmission system model is established in PSCAD/EMTDC,and the feasibility of the proposed strategy is verified by simulation.The results show that the proposed control strategy can improve the transmission power of the DC system and reduce the probability of the power transmission interruption when the AC fault condition is rectified.The DC current mutation rate protection scheme based on the DC circuit breaker can quickly isolate the fault,and improve power supply reliability.关键词
混合直流输电/多端直流输电/交直流故障/电流突变量保护/协调控制策略Key words
hybrid DC transmission/multi-terminal DC transmission/AC/DC fault/suddenly changed current protection/coordination control strategy分类
信息技术与安全科学引用本文复制引用
洪潮,时伯年,孙刚,张野,杨健,刘斌..基于LCC-MMC的三端混合直流输电系统故障特性与控制保护策略[J].电力建设,2017,38(8):73-79,7.
