徐政,张哲任
XU Zheng,ZHANG Zheren

• 1:浙江大学电气工程学院

摘要(Abstract)：

低频海底电缆输电技术在远海风电送出和海上风电场构网方面具有竞争优势,而M~3C(模块化多电平矩阵变换器)是低频输电技术的核心元件。针对M~3C的控制策略与子模块电压平衡控制展开研究:控制器仍然采用电压源换流器中常用的双环控制器结构,外环控制器设计与常规方法相同,内环控制器设计分成外部量控制与内部量控制分别进行。其中,内环外部量控制器设计在dq坐标系下进行,内环内部量控制器设计直接在αβ坐标系下进行。此外,针对全桥子模块的特点,通过定义3个特征量,提出一种简单有效、基于最近电平逼近且可满足子模块电压平衡控制要求的桥臂子模块投切策略。
Low-frequency submarine cable power transmission technology has competitive advantage in offshore wind power transmission and offshore wind farm network construction, and the modular multilevel matrix converter(M~3C) is the core component of low-frequency power transmission technology. This paper focuses on the M~3C control strategy and sub-module voltage balance control. The controller still uses the dual-loop controller structure commonly used in voltage source converters. The design of the outer loop controller is the same as the conventional method, and the inner loop controller design is divided into two parts: external variable control and internal variable control. Among them, the design of the outer variable controller is carried out in the dq coordinate system, and the design of the inner variable controller is carried out directly in theαβ coordinate system. In addition, according to the characteristics of the full-bridge sub-modules, by defining three characteristic variables, this paper proposes a simple and effective sub-module switching strategy that can meet the voltage balance control requirements of the sub-modules based on the nearest level modulation.

关键词(KeyWords)： 低频输电;M~3C;全桥子模块;双环控制;电容电压平衡
low-frequency transmission;M~3C;full-bridge sub-module;dual-loop control;capacitor voltage balance

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 徐政,张哲任
XU Zheng,ZHANG Zheren

DOI: 10.19585/j.zjdl.202110004

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