耦合电感辅助换流的并联谐振直流环节逆变器  

Parallel resonant DC link inverter with coupled inductors-assisted commutation

作　　者：王强[1] 唐朝垠 王天施[1] 刘晓琴[1] 

机构地区：[1]辽宁石油化工大学信息与控制工程学院,辽宁抚顺113001

出　　处：《电机与控制学报》2015年第6期76-82,共7页Electric Machines and Control

基　　金：国家自然科学基金(51207069);辽宁省教育厅科研项目(L2013146);中国博士后科学基金(2013M531349);江苏省博士后科研资助计划项目(1301105C)

摘　　要：为克服传统硬开关逆变器存在的缺点,提出一种新型并联谐振直流环节软开关逆变器,其辅助谐振电路含有耦合谐振电感,结构相对简单。通过辅助电路的谐振使直流母线电压下降到零时,逆变器的主开关可以完成零电压开关,同时辅助开关也可以在辅助谐振电路的工作过程中完成软开关,而且直流母线零电压持续时间的变化范围取决于谐振电流设定值和谐振参数。依据不同工作模式下的等效电路图,分析电路的换流过程和设计规则,并建立起辅助谐振电路损耗的数学模型,讨论谐振参数对辅助电路损耗的影响。制作了一个140W的实验样机,实验结果表明逆变器的主开关和辅助开关器件都实现了软开关,所以该软开关逆变器能有效地降低开关损耗和提高效率。A novel parallel resonant DC link soft-switching inverter was proposed to overcome the draw- backs of the conventional hard-switching inverter. The coupled resonant inductors were in the auxiliary resonant circuit and the topology was relatively simple. When DC-bus voltage decreased to zero via the resonance of the auxiliary circuit, zero-voltage operation of all main switching devices in inverter could be realized. Auxiliary switching devices could also be operated under soft-switching in the resonant process. Furthermore, the duration time of zero voltage was dependent on resonant current and resonant parame- ters. According to equivalent circuits under different modes, commutation process of the circuit and de- sign rule were analyzed. The mathematical model for auxiliary resonant circuit loss was established and the influence of resonant parameters on the loss of auxiliary circuit was discussed. A 140W laboratory prototype was built. The experimental results demonstrated that soft-switching operation of all switching devices could be realized. Therefore, the soft-switching inverter presented can effectively reduce switc- hing loss and improye efficiency.

关 键 词：逆变器 软开关 并联谐振 耦合电感 零电压 

分 类 号：TM464[电气工程—电器]