基于简化SVPWM的逆变器死区效应分析与补偿

针对PWM逆变器死区效应引起的误差电压矢量致使开关管实际开通时间与理想给定开通时间不相等的问题,从消除误差电压矢量着手,结合SVPWM的特点,给出简化算式,提出了死区的时间补偿方法。本补偿方法采用对三个桥臂的死区时间进行独立补偿,死区大小由对应相电流的大小实时计算并直接补偿到简化SVPWM算法当中。仿真实验结果表明,所提方案能够有效地改善电流波形的正弦程度和相位偏移,算法实现简单,具有工程实用价值。

Dead Time Effect Analysis and Compensation of Inverter Based on Simplified SVPWM

Error voltage vectors caused by dead-time effects of PWM inverter were given in this paper.In order to make practical conduct time equal to ideal given time of switching devices,a dead-time compensation method based on time was proposed,simple arithmetic was obtained with the characteristic of space vector PWM(SVPWM).A dead-time compensation method based on voltage was proposed also to eliminate error voltage vector.A new method which independently regulates the dead-time of three inverter legs and the value of dead time is adjusted on-line by the value of corresponding phase current and direct compensation to the simplified SVPWM algorithm is proposed.Simulation results show that the proposed scheme can effectively improve the current level and phase of sine wave offset,and the algorithm is simple and has practical engineering value.