In order to reduce the operating frequency and loss of the auxiliary commutation circuit (ACC) and current stress of auxiliary switches of a parallel resonant dc-link inverter (PRDCLI), this article proposes a novel space vector pulsewidth modulation (SVPWM) method. The novel SVPWM method can reduce the number of operations of the ACC to once in every PWM cycle on the premise of realizing soft switching of all switches, thereby reducing the operating frequency and loss of the ACC. At the same time, by adding the shunt dead time, the novel SVPWM method can avoid the superposition of the resonant current and load current, thereby minimizing the current stress of auxiliary switches. In addition, the novel SVPWM method can apply to any PRDCLI with the ability of variable zero voltage durations. Under the novel SVPWM method, according to the equivalent circuits of different operation modes, the operation principle, soft switching realization conditions and parameter design methods of the inverter are analyzed. Finally, a 10-kW/16-kHz prototype is built using insulated gate bipolar transistors to verify the validity of the novel SVPWM method.

中文翻译：

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辅助换向电路中损耗最小的并联谐振直流逆变器的SVPWM方法

为了降低并联谐振直流逆变器（PRDCLI）的辅助换向电路（ACC）的工作频率和损耗以及辅助开关的电流应力，本文提出了一种新颖的空间矢量脉宽调制（SVPWM）方法。新颖的SVPWM方法可以在实现所有开关软开关的前提下，将ACC的操作次数减少到每个PWM周期一次，从而降低ACC的工作频率和损耗。同时，通过增加并联死区时间，新颖的SVPWM方法可以避免谐振电流和负载电流的叠加，从而最大限度地减少辅助开关的电流应力。此外，新颖的 SVPWM 方法可以应用于任何具有可变零电压持续时间能力的 PRDCLI。在新颖的 SVPWM 方法下，根据不同运行方式的等效电路，分析了逆变器的运行原理、软开关实现条件和参数设计方法。最后，使用绝缘栅双极晶体管构建了 10 kW/16 kHz 原型，以验证新型 SVPWM 方法的有效性。