面向输出电压波形质量及中点电位动态性能提升的三电平逆变器混合虚拟空间矢量调制策略  

Hybrid Virtual Space Vector Modulation Strategy for Enhancing Output Voltage Waveform Quality and Neutral Point Potential Dynamics in Three-level Inverters

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作  者:张鑫 刘增[1] 宋英 王绪杰 刘进军[1] ZHANG Xin;LIU Zeng;SONG Ying;WANG Xujie;LIU Jinjun(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区:[1]西安交通大学电气工程学院,西安710049

出  处:《高电压技术》2025年第4期1877-1888,共12页High Voltage Engineering

基  金:国家重点研发计划(2023YFB2604600)。

摘  要:中点电位平衡是三电平逆变器稳定运行的前提,现有基于虚拟空间矢量调制的中点电位控制方法虽然能够改善中点电位动态性能,但在跨扇区选择开关矢量时,会导致输出交流电压波形质量下降。针对此问题,该文提出一种混合虚拟空间矢量调制策略,根据中点电位偏移程度选用相应的中点电位控制模式。中点电位偏移较小时,在所有扇区内均依据“最近三矢量原则”选取开关矢量以提高输出交流电压波形质量,并通过中点电位闭环控制实现中点电位稳定;当中点电位偏移较大时,通过筛选序列中小矢量并增加小矢量作用时间,提升中点电位控制动态响应。实验结果验证了所提调制策略的有效性及优越性。Neutral-point potential balance is a prerequisite for the stable operation of a three-level inverter,and the existing neutral-point potential control method based on virtual space vector modulation enhances the dynamic performance of neutral-point potential control,however,it facilitates a degradation in the quality of output AC voltage waveforms during the selection of switching vectors across sectors.To address this issue,this paper proposes a hybrid virtual space vector modulation strategy that selects the corresponding neutral-point potential control mode according to the degree of neutral-point potential offset.When the neutral-point potential offset is small,the vectors are selected in all sectors according to the principle of the“nearest three vectors”to improve the output AC voltage waveform quality,with the neutral-point potential stabilized through closed-loop control.Meanwhile,when the neutral-point potential deviation is large,the small vectors in the sequence are screened,and the action time of the small vectors is increased to ensure that the neutral-point potential control achieves expected response speed.The effectiveness and superiority of the proposed modulation strategy are validated through experiments.

关 键 词:T型中点箝位三电平逆变器 中点电位平衡 虚拟空间矢量脉宽调制 波形质量优化 混合调制 

分 类 号:TM464[电气工程—电器]

 

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