摘要
对±500kV柔性直流多电平换流器桥臂的工作原理进行了分析,在对阀段稳态工况和直流侧短路工况的基本特征进行总结的基础上,基于稳态和短路状态下电压应力、电流应力和热应力的等效工作原理,设计了一种功率模块试验装置等效试验电路,可满足不同功率等级的至少一个功率子模块在稳态工况和短路工况下的试验要求,针对该等效试验电路,在模型分析的基础上设计了满足试验要求的控制策略,以及设计了基于三层结构的阀段控制保护系统。搭建了一个五模块的2组阀段系统组成的2个桥臂,进行了相关的试验验证。试验结果表明,所提功率模块试验装置等效试验电路以及阀段控制保护系统能够满足试验要求,对多组阀段系统的控制方法是有效的。
The working principle of multilevel converter arm bridge in ±500kV flexible HVDC is analyzed,and the basic features of valve section steady-state operating conditions and the DC-side short circuit operating conditions are summarized. Based on the above analysis and the equivalent working principle of voltage stress,current stress and thermal stress of valve section in the steady-state and the short circuit operation conditions,a kind of equivalent test device circuit of power module is designed,which satisfies the requirement of the test with at least one power module of different power levels in steady-state and the short circuit operation conditions. In view of the equivalent test circuit,its control strategy is designed based on the analysis of model,and the protection and control system of the valve section based on a three-layer structure is designed. Two bridge arms composed of a five-module two-valve section system are built,and relevant tests are carried out. The test results show that the proposed equivalent test circuit of the power module test device and protection and control system of the valve section meet the test requirements,and the control method of the multi-valve section system is effective.
作者
李建春
胡兆庆
殷冠贤
卢宇
李海英
LI Jianchun;HU Zhaoqing;YIN Guanxian;LU Yu;LI Haiying(Nanjing NR Electric Co.,Ltd.,Nanjing 211102,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第3期84-89,共6页
Electric Power Automation Equipment
基金
国家电网公司科技项目(±500 kV/3000 MW高压大容量模块化电压源型换流器关键技术研究及样机研制)~~
关键词
柔性直流输电
阀段
等效试验电路
控制策略
控制保护
模块化多电平换流器
flexible HVDC power transmission
valve section
equivalent test circuit
control strategy
control and protection
modular multilevel converter
