模块化多电平谐振变换器多自由度调压控制及子模块电容均压方法

doi:10.19595/j.cnki.1000-6753.tces.221010

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摘要模块化多电平谐振变换器（MMRC）因具备模块化多电平拓扑和谐振电路的共同优点而在中压领域得到广泛研究,但在宽范围输入下的配用电场合,针对该拓扑的高效调控方法仍缺少相关深入探究。为此,该文提出一种适用于中压宽范围输入的模块化多电平谐振变换器多自由度调压控制方法。首先,分析开关频率和调制比应用于电压增益调节的效果和特点。接着,结合调频和调制比两种控制自由度提出多自由度组合的宽范围调压方法,并且揭示变调制比控制引发的子模块电容电压波动大的问题,针对性地提出一种监督式电容均压算法以降低纹波。最后,基于输入电压8~16kV、输出功率60kW的实验样机验证所提调控方法的有效性,并实现了全输入电压范围满载效率大于96%,子模块电容电压纹波幅值降低60%。

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关键词 ：模块化多电平谐振变换器, 宽范围中压, 多自由度调控, 电容电压纹波抑制

Abstract：Modular multilevel resonant converters (MMRC) have attracted many studies in the medium voltage area due to the advantages of modular multilevel topology and LLC resonant circuits. However, in the wide input range field, more in-depth research still needs to be conducted on the efficient regulation of this topology. This paper proposed a multi-degree-of-freedom (DOF) voltage regulation control method for a modular multilevel resonant converter. Firstly, the voltage regulation effects and characteristics of switching frequency and modulation index are analyzed. Then, combining both frequency regulation and modulation index control, a wide-range voltage regulation method with multi-degree-of-freedom is proposed, and the hardware parameters and control parameters are designed in detail. Moreover, a supervised capacitor voltage method for ripple suppression is proposed to reveal large capacitor ripple issue under modulation index control. Finally, the effectiveness of the proposed method is verified by a laboratory prototype with a wide input voltage of 8~16kV and an output power of 60kW. The full-load efficiency of the full input voltage range is greater than 96%, and the submodule capacitor voltage ripple is reduced by 60%.

Key words： Modular multilevel resonant converter medium voltage wide input range multiple degree-of-freedom control capacitor voltage ripple suppression

收稿日期: 2022-05-31

PACS:

TM46

基金资助:国家重点研发计划国际合作重点专项（2022YFE0101900）、国家自然科学基金（52107214）和内蒙古自治区重大专项（2021D0026）资助项目

通讯作者: 向鑫男,1990年生,研究员,博士生导师,研究方向为新能源发电并网、柔性直流输配电与大容量直流变换。 E-mail: xiangxin@zju.edu.cn

作者简介: 盛景男,1993年生,博士研究生,研究方向为模块化多电平变换器拓扑及其控制。E-mail: zjdxsj2013@zju.edu.cn

引用本文:

盛景, 陈聪, 向鑫, 李楚杉, 李武华. 模块化多电平谐振变换器多自由度调压控制及子模块电容均压方法[J]. 电工技术学报, 2022, 37(24): 6216-6229. Sheng Jing, Chen Cong, Xiang Xin, Li Chushan, Li Wuhua. Multiple-Degree-of-Freedom Control and Capacitor Voltage Balancing Method of Modular Multilevel Resonant Converter. Transactions of China Electrotechnical Society, 2022, 37(24): 6216-6229.

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