Floating voltage suppression method, device, inverter control system and inverter thereof

摘要

#$%^&*AU2015203657B220161027.pdf#####ABSTRACT A floating voltage suppression method applied to a multi-input multi-stage inverter is provided. The method includes determining a suspended branch of the inverter, where the suspended branch is a branch for which an input voltage is less than a preset voltage; and sending a driving signal for a switching tube continuously to a first stage of power conversion circuit of the inverter connected to the suspended branch until an input voltage for the suspended branch is not less than the preset voltage, thereby suppressing the floating voltage on the input side of the inverter without reducing the conversion efficiency and sampling accuracy of the inverter and without increasing the hardware cost. Further, a floating voltage suppression device, an inverter control system and a multi-input multi-stage inverter are provided. (Figure 1)1/2 start 101 a suspended branch of the multiinput multi-stage inverter is determined 102 a driving signal for a switching tube is sent continuously to a first stage of power conversion circuit of the inverter connected to the suspended branch 103 whether an input voltage y of the suspended branch is less than a preset voltage N end Fig. 1 direct current+ o direct current- alternating PV1 direct current current - conversion circuit conversion + direct current-circuit PV2 direct current conversion circuit multi-input multi-stage inverter Fig. 2