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R. Griñó, R. Costa-Castelló and E. Fossas Instituto de Organización y Control (IOC)

Digital Control of a Single-Phase Shunt Active Filter. R. Griñó, R. Costa-Castelló and E. Fossas Instituto de Organización y Control (IOC) Universitat Politècnica de Catalunya Barcelona, Spain. Introduction.

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R. Griñó, R. Costa-Castelló and E. Fossas Instituto de Organización y Control (IOC)

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  1. Digital Control of a Single-Phase Shunt Active Filter R. Griñó, R. Costa-Castelló and E. Fossas Instituto de Organización y Control (IOC) Universitat Politècnica de Catalunya Barcelona, Spain

  2. 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. Nonlinear Load Linear Load Active Filter Basic Concepts

  4. Complete Picture Full Bridge Boost Converter

  5. r L r L C C Boost Converter

  6. Boost Converter II The averaged model

  7. Control Goals • Constant average value of the voltage at the DC bus capacitor: • Current in phase with the voltage waveform:

  8. Boost Converter Repetitive Controller PI Controller Proposed Control Scheme • Two control loops : • Current loop : Digital Repetitive Control • Voltage loop : Classical PI Control

  9. Current Control loop ZOH, T

  10. + Repetitive Control Basics

  11. Repetitive Control Scheme Repetitive Controller

  12. Repetitive Stability Conditions • First stability Condition : The System without the Repetitive Controller must be stable. • Second stability Condition • Third stability Condition :

  13. Voltage Loop Current loop in steady state r=0

  14. Voltage Loop PI

  15. Setup : General view

  16. Setup : IGBT drivers

  17. Setup : Control hardware

  18. 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 Experimental Setup

  19. Experimental Results: Nonlinear Load

  20. Experimental Results: No-Load

  21. Experimental Results: Full NL load

  22. Experimental Results: Full NL load

  23. Experimental Results: Full load to No-load

  24. Experimental Results: No-load to full load

  25. 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.

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