Predictive Control of Three Phase AC/DC Converters

106 CHAPTER 6. EXPERIMENTAL STUDY
6.4 Summary
In order to verify the behavior of the predictive control methods several experimental
test have been carried out. This Chapter evaluates both VSF and CSF
predictive methods, along well known ST-DPC and DPC-SVM. Additionally, for
selected methods, a low switching frequency operation have been investigated.
Control Method t set [µs] t r [µs] t r2 [µs]
ST-DPC 600 190 400
VSF-P-DPC 420 390 400
HC-VSF-P-DPC 600 100 300
FL-VSF-P-DPC 600 100 300
DPC-SVM 1000 600 500
CSF-P-DPC 600 260 450
VF-CSF-P-DPC 600 260 450
Table 6.4: Summarized dynamic properties of control methods for P ref step
change
Control Method t set [ms] t r [ms] Overshot [%]
ST-DPC 50 25 5
VSF-P-DPC 50 25 5.5
HC-VSF-P-DPC 50 25 3
HC-VSF-P-DPC 50 25 3
DPC-SVM 55 30 4
CSF-P-DPC 50 35 3.5
VF-CSF-P-DPC 50 35 3.5
Table 6.5: Dynamic properties of control methods for U DCref step change
Control Method t set [µs] t r [µs]
DPC-SVM 4000 2000
CSF-P-DPC 1500 1000
VF-CSF-P-DPC 1500 1000
Table 6.6: Summarized dynamic properties of control methods for P ref step
change with low switching frequency
The Predictive methods have very good results both in steady-state (see
Tab. 6.2) and transients (see Tab. 6.4 and Tab. 6.5). The comparative study
between ST-DPC and variable switching frequency predictive methods establish
that for comparable switching frequency VSF-P-DPC has the same dynamic features,
but it gets lower T HD factor (1% of improvement).