Figure 1.

Topology of three-phase APF"

Figure 2.

Schematic diagram of deadbeat control with one-sampling-period delay"

Figure 3.

Deadbeat control structure diagram with delay in Z domain"

Figure 4.

Pole-zero plots of the conventional deadbeat control method with different inductance variation coefficients"

Figure 5.

Block diagram of reference current prediction"

Figure 6.

Block diagram and its simplified diagram of improved predictive deadbeat current control (a)Block diagram of improved current prediction deadbeat current control (b)Simplified and improved current prediction deadbeat current control block diagram"

Figure 7.

Pole-zero plots of different weight coefficient (a)k=0.8,0<m<0.5 (b)k=1.2, 0<m<0.5"

Figure 8.

Bode diagram of closed-loop transfer function of traditional and improved deadbeat control system"

Figure 9.

Improved current prediction deadbeat control system unit step response (a)k=1.2, 0<m<0.5 (b)k=1.5, 0<m<0.5"

Table 1

Simulation parameters"

Figure 10.

Grid current and its harmonic distortion rate (a)Grid side current waveform before treatment (b)Grid side current harmonic distortion rate"

Figure 11.

Comparison of simulation results of traditional and improved deadbeat control (a)Simulation results under traditional deadbeat control (b)Simulation results of improved deadbeat control without weight coefficient (c)Simulation results of improved deadbeat control with weighting coefficient"

Figure 12.

Grid-side current waveform and harmonic distortion rate under inductance deviation (a)k=0.5 (b)k=2"

Figure 13.

Grid current waveform under sudden load change"