Abstract
This paper has presented improved control structure based direct power control (DPC) applied for shunt active power filtering. Basically, DPC control strategy employs instantaneous active and reactive power terms as controlled variables. This work introduces an integration concept of predictive control algorithm for shunt active power filter system application. Process of this latter adopts discrete model of PWM converter in the aim to predict future behaviour of the system. Switching vector selection principles for predictive control is very different compared to conventional method. For conventional DPC the selection is performed via heuristic switching table while predictive DPC algorithm takes on an optimized way based on cost function minimization depending to power errors, this latter evaluate the effects of each active voltage vector and the one reducing the cost function is chosen to be applied in the next sampling period. The application of optimal switching state leads to regulate the input active and reactive power which resulted in the cancellation of harmonic power component contained in the network. Simulation results are presented to verify the validity and effectiveness of the proposed predictive DPC in terms of dynamic and steady state performance for shunt active power filtering application.
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Appendices
Appendix A: Nomenclature
e s (a, b, c) | Source voltage of phase-A, phase-B and phase-C respectively |
V SAPF (a, b, c) | Inverter output voltage of phase-A, phase-B and phase-C respectively |
i s (a, b, c) | Source current of phase-A, phase-B and phase-C respectively |
i l (a, b, c) | Load current of phase-A, phase-B and phase-C respectively |
i f (a, b, c) | Filter current of phase-A, phase-B and phase-C respectively |
P s | Instantaneous grid active power |
P * s | Command signal for grid active power |
Q s | Instantaneous grid reactive power |
Q * s | Command signal for grid reactive power |
– | Over the letter: continuous component |
∼ | Over the letter: harmonic component |
* | Over the letter: conjugate operator |
α | Direct component in the stationary reference frame |
β | Quadratic component in the stationary reference frame |
Appendix B: Circuit parameters
Circuit parameters | |
e s | Grid voltage 80 V |
R s | Grid filter resistor 0.1 Ω |
L s | Grid filter inductor 2 mH |
R c | Load side filter resistor 0.01 Ω |
L c | Load side filter inductor 0.5 mH |
R f | SAPF filter resistor 0.01 Ω |
L f | SAPF filter inductor 1 mH |
R l | Load resistor 10 ∼ 20 Ω |
L l | Load inductor 1 mH |
C | Capacitor 2200 μF |
V dc | Dc link voltage 180 V |
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Medouce, H.E., Benalla, H. Predictive model approach based direct power control for power quality conditioning. Int J Syst Assur Eng Manag 8 (Suppl 2), 1832–1848 (2017). https://doi.org/10.1007/s13198-017-0679-4
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DOI: https://doi.org/10.1007/s13198-017-0679-4