微型电脑应用

为消除T型三电平逆变器共模电压产生的电磁干扰问题，提出一种改进型虚拟电压矢量调制策略。所提调制策略通过筛选零共模矢量并合成新虚拟矢量，可将逆变器共模电压降低为0。对电容电压不平衡的情况，采用分配系数调节矢量作用时间，对中点电流进行控制，实现中点电位平衡。并对新虚拟矢量占空比进行计算，提出一种简化算法。

To eliminate the electromagnetic interference problems caused by the common mode voltage in T-type three-level inverters, an improved virtual voltage vector modulation strategy is proposed. The proposed modulation strategy selects zero common mode vectors and synthesizes new virtual vectors to reduce the common mode voltage of the inverters to zero. In the case of unbalanced capacitor voltage, the vector dwell time is adjusted using a distribution coefficient to control the neutral-point current and achieve neutral-point voltage balancing. Furthermore, a simplified algorithm for calculating the duty cycle of the new virtual vectors is proposed.