中国电机工程学报2017，Vol.37Issue(z1)：177-185,9.DOI:10.13334/j.0258-8013.pcsee.161080
考虑中点电位平衡的三电平逆变器断续脉宽调制策略研究
Three-level Inverter Discontinuous Pulse-width Modulation Strategy Considering Neutral Point Potential Balance
摘要
Abstract
In high-power inverters, discontinuous pulse width modulation (DPWM) could increase the equivalent switching frequency, improve control performance of the system and reduce the difficulty of filter design with the same switching losses, but its neutral point balancing control had not been well resolved. To address this issue, this paper took the three-level DPWM1 as an example. The realization method of the three-level DPWM1 based on the space vector pulse width modulation was analyzed. The influence of three-level DPWM1 and its redundant vector sequence (DPWM3) on the midpoint potential was quantitatively analyzed by using the neutral point balance control method of continuous modulation. A hybrid modulation strategy based on DPWM1 and DPWM3 was proposed, which could effectively control the balance of neutral point potential. During the adjustment period, the switching frequency was almost constant, and hysteresis control was adopted to switch between the two modulation algorithms. The common vectors of each small sector of the two modulation algorithms were selected as the switching vectors, which could reduce the extra switching action caused by the switch. Finally, the simulation and experimental results verify the feasibility of the modulation strategy.关键词
断续脉宽调制/三电平/中点平衡/冗余矢量/混合调制Key words
discontinuous pulse width modulation/three-level/neutral point balance/redundant vector/hybrid modulation分类
信息技术与安全科学引用本文复制引用
孙青松,吴学智,唐芬..考虑中点电位平衡的三电平逆变器断续脉宽调制策略研究[J].中国电机工程学报,2017,37(z1):177-185,9.基金项目
国家能源应用技术研究及工程示范项目(NY20150301).Project Supported by Application Technology Research and Engineering Demonstration Program of National Energy(NY20150301). （NY20150301）
