N n + 1 input single-phase rectifier switch group and a control method mmc

The present invention provides N N + 1 input single-phase rectifier and a control switch group MMC method. The inverter includes N AC input power, the N AC inductance, capacitance bridge arm, the switching arm and a rectifying load; arm of the capacitor in series from the N + 1 capacitors, the switch arm by the N + 1 th switch group, the first inductor and a second inductor connected in series; i-th switch group connected in series by the switching arm of the power switching unit is made of n, wherein the value of i is 1 ~ N + 1; k-th AC as both ends of the k-th input, wherein the value of k 1 ~ N. The present invention employs a carrier phase shift PWM control, input AC N N channels into n + 1 AC input level, is superimposed to the rectified load, and the voltage stress of the power switch cells each MMC switch receiving only 1 / n of the DC power supply voltage, to solve the problem of equalizing switch tube, for multiple AC power input, the application of high pressure and high power applications.