段子越,孟永庆,孔颖,闫书豪,张海涛,杨勇
DUAN Ziyue,MENG Yongqing,KONG Ying,YAN Shuhao,ZHANG Haitao,YANG Yong

• 1:西安交通大学电气工程学院
• 2:国网甘肃省电力公司电力科学研究院

摘要(Abstract)：

带有电气隔离功能的高压大功率AC/AC换流器作为分频输电的关键设备,得到了越来越多的关注。基于模块化多电平技术,结合高频变压器和电压源型换流器模型,提出了一种高频隔离型模块化多电平换流器。建立了其在同步旋转dq坐标系下的数学模型,并设计了基于电网电压前馈的解耦控制策略以及桥臂内均压控制策略,在相同工程背景下,对4种模块化多电平换流器方案的经济性指标进行了对比总结,证明了高频隔离型换流器在分频输电系统中体积小,经济成本低的优势。在MATLAB/Simulink环境中搭建了换流器双端并网仿真模型,并对换流器的运行性能进行了仿真验证。
As a new transmission mode,fractional frequency transmission has increasingly prominent advantages in the field of renewable energy,especially in offshore wind power. As the key equipment of fractional frequency transmission,high-voltage and high-power AC/AC converter with electrical isolation function has attracted more and more attention. Based on modular multilevel technology. Based on modular multilevel technology,a high-frequency isolated modular multilevel converter(MMC)is proposed by combining high-frequency transformer and voltagesource converter models. A mathematical model in a synchronous rotating dq coordinate system is established,and a decoupling control strategy based on grid voltage feedforward and a voltage equalization control strategy within the bridge arm are designed to ensure stable operation of the system. Based on the method,the economic indexes of four MMC schemes are compared and summarized in the same engineering context. The advantages of small size and low economic cost of high-frequency isolated converters in fractional frequency transmission systems are demonstrated.A simulation model of the dual-terminal converter integration is built in MATLAB/Simulink environment,and the operational performance of the converter is simulated and verified.

关键词(KeyWords)： 分频输电系统;交交换流器;高频隔离;海上风电
fractional frequency transmission system;AC/AC converter;high-frequency isolation;offshore wind power

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司总部科技项目（5500-202099509A-0-0-00）

作者(Author): 段子越,孟永庆,孔颖,闫书豪,张海涛,杨勇
DUAN Ziyue,MENG Yongqing,KONG Ying,YAN Shuhao,ZHANG Haitao,YANG Yong

DOI: 10.19585/j.zjdl.202201010

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