基于60°坐标系下三电平逆变器VSVPWM策略研究  

Research on VSVPWM Strategy for Three-Level Inverters Based on 60-Degree Coordinate System

作　　者：陈友明 党轶凌 刘万里 张欢欢 柏忆梦 张秀文 CHEN Youming;DANG Yiling;LIU Wanli;ZHANG Huanhuan;BAI Yimeng;ZHANG Xiuwen(State Grid Ili Yihe Power Supply Co.,Ltd.,Yining 835000,China;Western Gold Ili Co.,Ltd.,Yining 835000,China)

机构地区：[1]国网伊犁伊河供电有限责任公司,新疆伊宁835000 [2]西部黄金伊犁有限责任公司,新疆伊宁835000

出　　处：《电工技术》2025年第2期37-42,46,共7页Electric Engineering

摘　　要：虚拟空间矢量调制策略能够完全消除三电平逆变器的中点电位低频波动,因而也能很好地解决中点电位平衡问题,但传统实现过程复杂、运算量大,且未考虑抑制中点电位波动及调节中点电位。采用基于载波的虚拟矢量调制策略简化开关占空比获取过程,通过广义PWM方程证明了虚拟矢量与直流侧不平衡度无关。提出的中点电位控制策略能够准确调节不平衡度,且能平抑小容值电容带来的中点电位波动。通过MATLAB/Simulink仿真实验验证了虚拟矢量调制策略和所提出的中点电位控制策略的有效性。Virtual Space Vector Modulation(VSVPWM)strategy can completely eliminate the low-frequency fluctuation of the neutral-point(NP)in three-level inverters,effectively addressing the issue of NP unbalance.However,the conventional implementation process is complex,computationally intensive,and does not consider suppressing NP fluctuations or adjusting NP independently.Adopting a carrier-based VSVPWM simplifies the process of obtaining switch duty ratios.Through the generalized PWM equation,it is demonstrated that the virtual vector is independent of the unbalancing degree.The proposed NP control strategy can accurately adjust the unbalancing degree and suppress the fluctuation of the NP caused by small capacitor.The effectiveness of the VSVPWM and the proposed NP control strategy is verified through MATLAB/Simulink.

关 键 词：虚拟空间矢量 中点电位低频波动 广义PWM方程 中点电位控制 

分 类 号：TM464[电气工程—电器]