提出了一个直流负总线辅助谐振电路(NBARC)与新型直流侧谐振电路镜像对称对模块设计, 用以实现两电平和三电平逆变器的软换流.NBARC的电路拓朴减少了功率器件的数目并降低了对器件的功率额定值的要求.为两电平逆变器零电压开关设计并分析了基本NBARC谐振电路,这个电路拓朴和模块设计方法被扩展到一个谐振模块镜像对称对电路,用以钳夹直流侧电压,并实现三电平逆变器的软换流.提出软换流允许在似零电压状态下实现,并分析了残余换流电压对于逆变器开关损耗的影响.模块方法允许软开关电路被设计成标准逆变器的可选附加块,可以把传统的逆变器转变为软开关逆变器.实验结果验证了电路分析和实现.%A negative-bus auxiliary resonant circuit (NBARC) and novel mirror symmetrical pair of resonant link modules for soft commutation of two -level and three-level inverters is presented. The NBARC topology reduces the power device counts and requires low device power ratings. While the basic NBARC resonant circuit is conceived and analyzed for zero-voltage switching of two-level inverters, the topology and modular design approach are extended to form a pinched-link resonant stage of zero-voltage switching for three-level inverters using mirror-symmetrical pair of resonant modules. An analysis of switching losses versus the residual commutation voltage is conducted. The modular approach allows the soft-switching circuit to be designed as an add-on optional module to a standard inverter, which can convert a conventional inverter into a soft-switched inverter. Experimental results verify our circuit analysis and implementation.
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