4-SiC 3L-ANPC逆变器损耗均衡和效率优化调制策略

A Dedicate Modulation Scheme for 4-SiC 3L-ANPC Inverter With Loss Balanced Distribution and Efficiency Improvement

提出一种4-SiC混合三电平有源中点钳位逆变器(three-level active neutral point clamped,3L-ANPC)及其损耗均衡调制策略,将硬开关损耗分配给不同SiC MOSFET,让通态损耗高的SiCMOSFET仅承受关断损耗,而通态损耗低的SiCMOSFET仅承受开通损耗;并提出将续流状态2条电流支路并联,降低续流状态的通态损耗。分析所提新4-SiC混合3L-ANPC的工作原理和模态,理论计算和对比传统4-SiC和所提4-SiC混合方案的损耗。最后,搭建一台2kW的单相3L-ANPC逆变器样机,验证所提4-SiC混合方案相比与传统4-SiC混合方案,优化了SiC器件损耗均衡,并提高了变换效率。

A 4-SiC hybrid three-level active neutral point clamped(3L-ANPC) inverter and dedicate modulation scheme with the loss balance distribution characteristic were proposed.The turn-on switching loss was distributed to the SiC MOSFET with a lower conduction loss. Moreover, the turn-off switching loss was distributed to the SiC MOSFET with a higher conduction loss. In addition, dual freewheeling paths were used to lower the conduction losses during freewheeling modes.Both the operation principle and working states were analyzed in detail. The calculated power losses of the proposed new 4-SiC hybrid 3L-ANPC inverter and the conventional 4-SiC hybrid 3L-ANPC inverter were addressed and compared.Finally, a 2kW prototype was built. Experimental results and analysis show that compared with the conventional 4-SiC hybrid 3L-ANPC inverter, the proposed 4-SiC 3L-ANPC inverter and dedicate modulation scheme exhibit higher efficiency and better loss balance performance.