Predictive Control of Three Phase AC/DC Converters

78 CHAPTER 5. INVESTIGATIONS OF CONTROL METHODS PERFORMANCE
5
4.5
4
3.5
F swAV
[kHz]
3
2.5
2
1.5
1
0.5
2 kW
1 kW
0
−100 −50 0 50 100
∆ L [%]
Figure 5.1: Average switching frequency F swAV versus line choke inductance
value mismatch ∆L in VSF-P-DPC
25
(a)
2 kW
1 kW
25
(b)
2 kW
1 kW
20
20
∆ S [%]
15
∆ S [%]
15
10
10
5
5
0
−100 −50 0 50 100
∆ L [%]
0
−100 −50 0 50 100
∆ L [%]
Figure 5.2: Power error ∆S versus line choke inductance value mismatch ∆L in:
(a) VSF-P-DPC, (b) CSF-P-DPC
(a)
(b)
15
2 kW
1 kW
15
2 kW
1 kW
10
10
THD i400
[%]
THD i400
[%]
5
5
0
−100 −50 0 50 100
∆ L [%]
0
−100 −50 0 50 100
∆ L [%]
Figure 5.3: Line current T HD i factor versus line choke inductance value mismatch
∆L in: (a) VSF-P-DPC, (b) CSF-P-DPC
When L C inductance, used in VSF-P-DPC predictive model, is too low (∆L < 0),
switching frequency decreases Fig. 5.1. The line current T HD i factor depends