电源学报2025，Vol.23Issue(1)：67-75,9.DOI:10.13234/j.issn.2095-2805.2025.1.67
混合九电平逆变器功率均衡的调制策略
Modulation Strategy for Power Balance of Hybrid Nine-level Inverter
摘要
Abstract
For a hybrid cascade H-bridge inverter with a DC-side voltage ratio of 1:1:2,if the hybrid carrier disp-osition modulation strategy is adopted,the problem of output power imbalance in the low-voltage unit will occur al-though there is no current backflow phenomenon and the harmonic performance of output voltage is good.To solve this problem,the power imbalance is analyzed at first.Then,an improved hybrid modulation strategy is proposed,under which the high-voltage unit performs step wave modulation and the low-voltage unit performs PWM,and two low-voltage units adopt different processing methods for the modulation wave.The good harmonic performance of output voltage is kept,the number of triangular carriers is reduced,and the control process is simplified,with a frequency doubling effect.Third,this strategy is optimized,and the switching signal of low-voltage unit is logically calculated,which can solve the power imbalance problem of low-voltage unit in two carrier cycles.Finally,the feasibility was proved by simulation and experimental results.关键词
逆变器/混合调制/三角载波/逻辑运算/功率均衡/谐波含量Key words
Inverter/hybrid modulation/triangular carrier/logical operation/power balance/harmonic content分类
信息技术与安全科学引用本文复制引用
顾军,杜治斌,李平,宋飞,张维国,张明..混合九电平逆变器功率均衡的调制策略[J].电源学报,2025,23(1):67-75,9.基金项目
国家自然科学基金资助项目(51607003)This work is supported by National Natural Science Foundation of China under the grant 51607003 （51607003）
