Assuming that the main circuit of the three-phase CCM UPF Boost rectifier is a six-switch bridge converter, as shown in Figure 1, a current-type dual-loop system is adopted.
The power conservation method will be applied to establish the transient analysis model of the main circuit of current control.
Assuming that the three-phase input AC voltage is balanced and symmetrical, the input voltage and current are sinusoidal, the parasitic resistance of the input inductor La, Lb, Lc of each phase, and the on-state resistance of the corresponding switch tube are represented by Ra, Rb, and Rc respectively.
The output signal of the voltage controller (expressed in current) is known.
iu < Im, Im is the amplitude of the three-phase input current
The control current signal (the control signal of the current closed-loop system) is the synthesis of Im and iu:
Figure 1 Main circuit of three-phase CCM UPF Boost rectifier
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