【摘要】 背靠背三电平变流器广泛应用于中压交流传动领域。单个三电平逆变器某一时刻只能存在一种换流过程。当三电平整流侧IGBT和逆变侧IGBT被放置在同一条母线上时,由于两者控制策略上的不相关性,会存在一定的电磁耦合影响,对IGBT的安全运行造成一定的威胁。该文以一种存在耦合影响的三电平叠层母线作为研究对象。首先,采用部分单元等效电路(PEEC)建立母线的等效电路模型;其次,分析整流侧和逆变侧IGBT开关暂态过电压耦合问题,并建立IGBT过电压耦合函数;进一步,对存在过电压风险的IGBT给出脉冲解耦方法;最后,通过实验对IGBT存在的过电压耦合问题和脉冲延时方法进行验证。该文的研究对于多逆变器功率器件共叠层母线设计及IGBT可靠应用具有指导意义。更多还原

【Abstract】 Back-to-back three-level converters are widely used in medium voltage AC drive applications. It has only one process of commutation at one point for one three-level inverter. When the IGBT of three-level rectifier side and the inverter side are placed on the one laminated bus-bar, there will be a certain electromagnetic coupling effect to the IGBT, which is caused by the irrelevance of the control method between them. In this paper, a laminated bus-bar of the back-to-back three-level converter with coupling effect was taken as the research object. Firstly, the equivalent circuit of the bus-bar was established by the partial element equivalent circuit(PEEC) method. Then, the transient electromagnetic coupling problem of the IGBTs between rectifier and inverter was analyzed innovatively, and the transient coupled over-voltage function was established. Furthermore, the IGBT pulse timing decoupling method was given for the coupling circuit loops that have the risk of over-voltage. Finally, the correctness of the analysis was verified by the experiment, which is instructive for the laminated bus-bar design of multi-inverters and reliable operation of IGBT.更多还原