可控电流源型换流器IGCT串联均压技术
IGCT Series Voltage Sharing Technology of Controllable Current Source Converter
陈龙龙 1汤广福 2魏晓光 2王以璇 3崔翔 3高冲 1张闻闻3
作者信息
- 1. 先进输电技术国家重点实验室(国网智能电网研究院有限公司),北京市 昌平区 102209
- 2. 怀柔实验室,北京市 怀柔区 101400
- 3. 新能源电力系统国家重点实验室(华北电力大学),北京市 昌平区 102206
- 折叠
摘要
高压大功率逆阻型集成门极换流晶闸管(integrated gate commutation thyristor,IGCT)串联是可控电流源型换流器的关键技术之一,主要面临开通和关断不一致将会引起击穿的问题,目前尚缺乏深入研究和实验测试.该文首先分析可控电流源型换流器均压问题产生的原因,提出串联器件均压电路.接着,对开通不一致影响因素进行分析,给出IGCT使用电压和保护电压的配合关系,以确保开通过程器件安全.然后,对IGCT的自然和主动关断2种特殊关断过程影响因素进行分析,给出缓冲电路参数选择方法.最后,研制8级串联的IGCT模块样机,搭建实验平台进行测试.结果表明,所提方法能够有效抑制IGCT关断电压过冲,均压不一致性控制在8%以内.
Abstract
The control of voltage sharing is one of the core technologies of the current source converter based on series connected integrated gate commutation thyristor(IGCT).At present,there is a lack of research and testing on series-connected IGCTs,specifically addressing the inconsistencies in turn-on and turn-off characteristics caused by variations in IGCTs,trigger delay and snubber parameters.First of all,the mechanism caused voltage unbalance is carried out and a sub-module circuit for voltage sharing is proposed in this paper.Then,the inconsistency factors leading to IGCTs'turn-on inconsistency is analyzed,and the coordination between the IGCT utilization and protection voltage ratio is suggested.After that,this paper analyzes the natural and active turn-off characteristics and recommends snubber parameters.Finally,a test platform and an 8-level series IGCT module prototype are developed to verify the performance.Significantly,the test results indicate that the inconsistency of the voltage among IGCTs is controlled within 8%.
关键词
电流源型换流器/均压特性/静态均压/开通一致性/关断一致性Key words
current source converter(CSC)/voltage sharing characteristics/static voltage sharing/turning on inconsistence/turning off inconsistence引用本文复制引用
基金项目
国家电网科技项目(5500202058059A0000)
出版年
2024
国家科技期刊平台
NSTL
万方数据