为了避免三电平逆变器的上下桥臂直通，开关切换过程中会引入死区． 死区会提 高逆变器的输出电流谐波，降低逆变器的输出电压和电流． 文中分析了死区在开关管换流 过程中的作用，并在此基础上提出一种死区消除与补偿相结合的方法来消除其对逆变器 的不利影响． 当相电流足够大时，可以根据电流的方向输入不同的驱动信号，达到在没有 死区的情况下防止开关管短路的目的． 当相电流接近零点时，由于电流纹波的影响，死区 消除方法并不适用，只能通过引入死区来提高逆变器的稳定性，然后通过死区补偿来消除 其不利影响． 实验结果证明，文中方法可以有效地解决死区问题． 

 In Ttype converters， to avoid the power switches of the same leg to conduct simultaneously during altering the power switches， the deadtime has to be inserted into the switching sequence． However， the inserted deadtime increases the current THD and reduces the output voltage and current． In this paper，an approach which integrates deadtime elimination and compensation is proposed to remove the adverse effect of deadtime based on the function of the deadtime． When the phase current is much larger than the phase current ripple，the deadtime elimination is applied to avoid short circuit without dead time． When the phase current is near zero-crossing point， the deadtime elimination is inapplicable because of the disturbance of current ripples，and the deadtime must be used to improve the stability of inverter． Therefore， the deadtime compensation is used to remove the adverse effect of deadtime． At last， the experimental results demonstrate that the proposed approach is an effective solution to the problems caused by deadtime