A SPWM pulse rotation control method for cascade middle point clamping multi-level inverter
A technology of multi-level inverter and control method, which is applied in the direction of converting irreversible DC power input into AC power output, output power conversion device, electrical components, etc. Problems such as voltage balance, unbalanced voltage of two capacitors in series, increased hardware burden, etc., achieve easy motor vector control, reduce hardware burden, and achieve easy effects
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[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The following introduction takes phase A and N=4 as an example, and the method is applicable to phases B and C.
[0038] (1) Define the control signals K1, K2, K3 of each inverter unit, and define 8 switch signals Sa1, Sa2, Sb1, Sb2, Sa1', Sa2', Sb1', Sb2' of each inverter unit. according to Figure 1b , to determine the relationship between the control signal of each inverter unit and the switch signal, output voltage and capacitor used, as shown in Table 1, 1 in the table means Figure 1b The corresponding switch tube in is turned off, 0 means Figure 1b The corresponding switch in the conduction, v c1 , v c2 respectively Figure 1b Medium capacitance C 1 and C 2 the terminal voltage.
[0039] (2) Define the control signals of the 4 inverter units of phase A as: the first group of signals A11 、A 12 、A 13 , the second set of signals A ...
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