1. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco R. Griñó, R. Costa-Castelló and E. Fossas Instituto de Organización y Control (IOC) Universitat Politècnica de Catalunya Barcelona, Spain Digital Control of a Single-Phase Shunt Active Filter

2. 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Introduction Proliferation of nonlinear loads ->This fact has deteriorated the power quality of electrical power systems. More stringent requirements proposals IEC-61000-3-{2,4} and IEEE-519.

3. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Basic Concepts Linear Load Nonlinear Load Active Filter

4. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Complete Picture Full Bridge Boost Converter

5. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Boost Converter r L C r L C

6. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Boost Converter II The averaged model

7. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Control Goals Constant average value of the voltage at the DC bus capacitor: Current in phase with the voltage waveform:

8. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Proposed Control Scheme Two control loops : –Current loop : Digital Repetitive Control –Voltage loop : Classical PI Control Boost Converter Repetitive Controller PI Controller

9. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Current Control loop ZOH, T

10. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Repetitive Control Basics +

11. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Repetitive Control Scheme Repetitive Controller

12. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Repetitive Stability Conditions 1.First stability Condition : The System without the Repetitive Controller must be stable. 2.Second stability Condition 3.Third stability Condition :

13. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Voltage Loop Current loop in steady state r=0

14. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Voltage Loop PI

15. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Setup : General view

16. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Setup : IGBT drivers

17. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Setup : Control hardware

18. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Setup Active filter parameters: –Capacitor: 6600 uF, 450 V DC –Inductor: 0.8 mH –parasitic resistance: 0.04 Ohm –IGBT: 1200 V, 100 A Feedback paths (sensors): –Network voltage: voltage transformer (220V/15V) –Network current: Hall-effect sensor (TECSA-HA-050053) (50A) –DC bus voltage: AD-215BY isolation amplifier Control hardware: –ADSP-21161 floating-point DSP –ADMC-200 coprocessor: A/D channels and PWM generation

19. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Results: Nonlinear Load

20. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Results: No-Load

21. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Results: Full NL load

22. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Results: Full NL load

23. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Results: Full load to No-load

24. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Experimental Results: No-load to full load

25. Digital Control of a Single-Phase Shunt Active Filter 34th IEEE Power Electronics Specialists Conference June 15-19, 2003. Acapulco Conclusions The paper shows the design of an all digital multirate controller for a single-phase parallel active filter. The inner current control loop is designed using a repetitive control approach that. The outer slow sampling rate voltage control loop presents a good dynamic behavior in front of sudden changes of the load.