电网技术2017，Vol.41Issue(8)：2423-2428,6.DOI:10.13335/j.1000-3673.pst.2016.2645
受端分层特高压直流阀区保护优化策略
Optimal Strategies of Valve Protection of UHVDC With Hierarchical Connection Structure
摘要
Abstract
In UHVDC with hierarchical connection structure, HV and LV valves are connected to AC systems with different voltage levels to improve equipment availability and reduce power loss caused by AC system fault. This paper proposes a commutation failure prediction control linkage mechanism to reduce commutation failure probability and a valve harmonic current protection. The valve harmonic current protection is based on negative sequence voltage amplitude of fundamental frequency to withdraw corresponding valve connected to the AC system with asymmetric fault from service, so another valve can continue to operate normally. Valve undervoltage protection serves as backup protection for AC system with three phase symmetrical fault. On this basis, a multi-level protection action strategy is proposed to improve equipment availability and reduce power loss. Theoretical analysis and Real Time Digital Simulator (RTDS) simulation verified correctness and feasibility of the proposed strategies.关键词
受端分层特高压直流/换相失败/基波负序电压/谐波保护Key words
UHVDC with hierarchical structure/commutation failure/negative sequence of fundamental frequency/harmonic current protection分类
信息技术与安全科学引用本文复制引用
刘孝辉,赵森林,阮思烨,张庆武,卢东斌,王振曦,王永平..受端分层特高压直流阀区保护优化策略[J].电网技术,2017,41(8):2423-2428,6.基金项目
国家重点研发计划项目(2016YFB0900602) （2016YFB0900602）
国家电网公司科技项目(SGTYHT/15-JS-191).Project Supported by the National Key Research and Development Program of China (2016YFB0900602) and Science and Technology Foundation of State Grid Corporation of China (SGTYHT/15-JS-191). （SGTYHT/15-JS-191）
