柔性电力变压器技术研究与试验验证  

Study and Test Verification of Flexible Power Transformer Technology

作　　者：乔光尧 赵国亮 靳艳娇 张永征 QIAO Guang-yao;ZHAO Guo-liang;JIN Yan-jiao;ZHANG Yong-zheng(State Key Laboratory of Advanced Power Transmission Technology(China Electric Power Research Institute),Beijing 102209,China)

机构地区：[1]先进输电技术国家重点试验室(中国电力科学研究院有限公司),北京102209

出　　处：《电力电子技术》2025年第2期18-22,共5页Power Electronics

基　　金：国家电网有限公司科技项目(5500-202228107A-1-1-ZN)。

摘　　要：我国交直流系统中均采用机械式有载调压开关进行调压。由于机械式有载调压运行中长期承受电、热、力、振动等复杂应力作用,运行工况恶劣,给电网安全稳定运行带来极大挑战。本文提出一种结合电力电子技术的柔性电力变压器技术,通过在变压器绕组末端串入电压幅值灵活可调的电压源换流器,可以实现电压平滑、连续、频繁调节,适应系统多种运行方式。分析柔性电力变压器基本工作原理和抵御换相失败原理,针对典型±800 kV/10 000 MW特高压直流输电系统,建立含柔性电力变压器的直流输电模型,仿真分析直流换相失败补偿效果。搭建柔性电力变压器低压试验平台并进行试验验证,试验结果表明,柔性电力变压器可实现稳态快速调压和直流换相失败抵御功能,响应时间小于20 ms。The mechanical on-load voltage regulator is used in the AC and DC system in China.Because the mechani-cal on-load voltage regulator is subjected to complex stress such as electricity,heat,force and vibration for a long time,the operation condition is harsh,which brings great challenges to the safe and stable operation of the power grid.A flexible power transformer technology combined with power electronics technology is proposed.By inserting a voltage source converter with flexible voltage amplitude into the end of the transformer winding,the voltage can be adjusted smoothly,continuously and frequently,so as to adapt to various operating modes of the system.The basic working principle of flexible power transformer and the principle of resisting commutation failure are analyzed.For a typical±800 kV/10000 MW UHVDC transmission system,a DC transmission model including flexible power transfor-mer is established,and the effect of DC commutation failure compensation is simulated and analyzed.The low-voltage test platform of the flexible power transformer is built and tested.The test results show that the flexible power trans-former can realize steady-state rapid voltage regulation and DC commutation failure resistance,and the response time is less than 20 ms.

关 键 词：柔性电力变压器 电压源换流器 换相失败补偿 

分 类 号：TM41[电气工程—电器]