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可控换相换流器低压加压试验方法

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针对葛洲坝—南桥±500 kV直流改造工程受端换流站所采用世界首套可控换相换流器现场调试需求,开展可控换相换流器低压加压试验方法研究,明确了可控换相换流器的试验条件、零部件保留情况、试验设备以及实施步骤等,旨在满足可控换相换流器现场首次低压加压试验的可行性和安全性要求.在常规直流换流器低压加压试验方法不适用的条件下,根据可控换相换流器单阀器件阻容分压规律,初步估算得到电力电子保留级数及试验电压.通过搭建含详细换流器电磁暂态模型的试验仿真电路,更为精确地分析了换流阀不同运行模式下、保留不同器件级数时的器件电压应力,选取既满足取能条件又确保器件安全的试验电压和保留器件级数配置,确定了试验设备容量等.最终按照研究分析结果,在工程现场搭建试验系统,按照实施步骤开展低压加压试验,试验结果与仿真一致,证明了仿真和试验方法的有效性.
Low Voltage Test Method for Controllable Line-commutated Converter
This paper studies the low voltage test method for the world's first set of Controllable Line-commutated Con-verter(CLCC)at the inverter station of±500 kV Gezhouba-Nanqiao DC refurbishment project.The test conditions,component retention,test devices and implementation steps were clarified and proposed,aiming to ensure the feasibility and safety of the unprecedented tests.Firstly,according to the resistance-capacitance voltage distribution of the CLCC single valve,the retention series number of the converter devices and test voltage were preliminarily estimated under the condition that the calculation formula of the low voltage test for the traditional high voltage converter was not suitable.Secondly,the test system simulation model including detailed converter circuit was built,by which accurate device volt-age stress was obtained under different operation modes of the converter and different series number retention through transient simulation.Then appropriate test voltage and the retention number were selected to ensure that the energization condition of the device driver was satisfied,and the device peak voltage was modest.Finally,the test circuit was built on site and the test was carried out.Test results are consistent with the simulation,which proves the effectiveness of the sim-ulation and test method.

commutation failurecontrollable line-commutation converterlow voltage testline commutation modecontrollable commutation moderesistance-capacitance voltage distribution

张民、杨俊、杜炤鑫、刘宏、王毅、李婷婷

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国家电网有限公司,北京 100031

先进输电技术全国重点实验室(国网智能电网研究院有限公司),北京 102209

大功率电力电子北京市重点实验室(国网智能电网研究院有限公司),北京 102209

国网上海市电力公司,上海 200122

中电普瑞电力工程有限公司,北京 102200

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换相失败 可控换相换流器 低压加压试验 电网换相模式 可控换相模式 阻容分压

国家电网有限公司科技项目

5108-202218280A-2-109-XG

2024

10.13336/j.1003-6520.hve.20232346

高电压技术
中国电力科学研究院　中国电机工程学会

高电压技术

CSTPCD北大核心
影响因子：2.32
ISSN：1003-6520
年,卷(期)：2024.50(8)