| 引用本文: | 王伟健,顾 军,张海杰.混合级联 H 桥逆变器的新型功率均衡调制策略(J/M/D/N,J:杂志，M：书，D：论文，N：报纸).期刊名称,2025，42（3）：19-26 |
| CHEN X. Adap tive slidingmode contr ol for discrete2ti me multi2inputmulti2 out put systems[ J ]. Aut omatica, 2006, 42(6): 4272-435 |
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| 摘要: |
| 目的 传统的混合调制策略在应用于直流侧电压比为 1 ∶ 1 ∶ 2 的混合级联 H 桥多电平逆变器时,解决了电流
倒灌问题,但仍存在着各单元输出功率不均衡的问题。 为解决此问题,提出了一种可实现各单元输出功率均衡的
新型调制策略。 方法 新型调制策略从数学计算和开关状态组合角度出发,通过计算,控制高压单元输出功率为逆
变器输出总功率的一半,在此基础上,通过对冗余开关状态组合的调整,对高压单元的导通区间进行一次再分配,
以满足完整调制的要求,而低压单元在特定区间上的脉冲信号需经逻辑处理,以确保两低压单元的导通时间相等,
进而确保两低压单元输出功率相等。 结果 仿真和实验表明:新型调制策略不仅实现了三单元的功率均衡输出,并
且其输出电压质量更好。 结论 仿真和实验同时也说明了计算法可以控制 H 桥单元的输出功率,而对开关状态组
合的调整可以满足调制的需求,两者结合使用,可以有效解决直流侧电压比不相等的级联 H 桥单元间的功率均衡
问题。 |
| 关键词: 电流倒灌 功率均衡 开关状态组合 导通时间 |
| DOI： |
| 分类号: |
| 基金项目: |
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| A Novel Power Balancing Modulation Strategy for Hybrid Cascaded H-Bridge Inverters |
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WANG Weijian, GU Jun, ZHANG Haijie
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School of Electrical and Information Engineering Anhui University of Science and Technology Anhui Huainan 232001
China
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| Abstract: |
| Objective Traditional hybrid modulation strategies applied to cascaded H-bridge multilevel inverters with a
DC-side voltage ratio of 1 ∶ 1 ∶ 2 have addressed issues such as current backflow but still face challenges in achieving
balanced output power among individual cells. To tackle this issue a novel modulation strategy capable of balancing
output power among all cells is proposed. Methods The novel modulation strategy starts from the perspectives of
mathematical calculations and switch state combinations. Through calculations it controls the output power of the high-
voltage unit to be half of the inverter ?? s total output power. On this basis by adjusting redundant switch state
combinations the conduction intervals of the high-voltage unit are redistributed once to meet the requirements of complete
modulation. Meanwhile pulse signals for the low-voltage cells within specific intervals require logical processing to ensure
equal conduction time between the two low-voltage cells thereby ensuring that their output powers are equal. Results
Simulation and experimental results demonstrate that the novel modulation strategy not only achieves balanced output power
among the three cells but also improves the quality of output voltage. Conclusion Simulation and experiments also confirm
that the calculation method effectively controls the output power of the H-bridge cells and adjustments to switch state combinations meet the requirements for modulation. These two methods when combined can effectively address the issue
of power balancing between cascaded H-bridge units with unequal voltage ratios on the DC side. |
| Key words: current backflow power balancing switch state combination conduction time |
