Attachment shcm

1. Selective Harmonic Current Mitigation
with a Shunt Active Power Filter
Project C0014-2014-03 247099 Institutional Links CONACYT-British
Council
Universidad Michoacana de San Nicolás de Hidalgo
Meeting April 6, 2016
División de Estudios de Posgrado de la
Facultad de Ingeniería Eléctrica

2. Motivation
Introduction
Detection methods
SAPF
Selective harmonic current
compensation method
Conclusions

3. 1. MOTIVACIÓN
• In electric power systems are switched system
introducing harmonic line mainly due to the
switching elements.
•Harmonics generated from nonlinear loads, such
as switch mode power converters and adjustable
speed drives, as well as other unbalanced loads in
distribution networks deteriorate power quality in
power transmission and distribution systems.
•Nonlinear loads increase losses and produce
harmonic distortion in the grid.

4. •This harmonic distortion can be mitigated using
passive filters.
•Thus, passive filters cannot always provide a
complete compensation solution.
•As an alternative, different active filter solutions
have been continuously analyzed in recent years. A
conventional (APF) is typically composed of three
single phase inverters and pulse width modulation
(PWM) and can be connected to the load either in
parallel or in series
INTRODUCTION

5. Algorithm Harmonic Detection Method
Frequency-domain Discrete Fourier Transform (DFT)
Fast Fourier Transform (FFT)
Recursive Discrete Fourier Transform
Time-domain Synchronous harmonic dq-frame
Band pass filters
Instantaneous power “pq theory”
Generalized integrators
Other Prediction algorithms, Prony analysis
Kalman filters
Nueral networks and adaptive control
Wavelets Transform
Classification of the most used harmonic
detection methods in APF’s

6. REFERENCE CURRENTS CALCULATOR
BASED ON THE THEORY PQ

7. Schematic of SAPF

8. PRINCIPLE OF OPERATION OF AN ACTIVE FILTER

9. Components of an APF connected to a
power system

10. Block diagram of the control circuit based on
the APF-abc

11. Implementation of the APF in MatLab®

12. Topology of a shunt active power filter

13. Case Study

14. LOAD CURRENTS AND HARMONIC SPECTRUM

17. Selective harmonic current mitigation based of
a Hybrid active power filter

18. Currents generated by the nonlinear load
and unbalanced linear load.

19. Illustrates the current to be injected by the
active filter. It may be noted that has a
high harmonic content, can be impractical
in some systems

20. Extraction of the fundamental component for the APF
Results of the contribution of injection of the fundamental component
current in the three-phase system

21. Harmonic spectrum for selective compensation the
fifth harmonic
Selective compensation of fundamental component
and fifth harmonic

22. Harmonic spectrum of source currents based
on selective harmonic compensation

23. Conclusion
s•The simulation was conducted based
on a three-phase circuit with linear and
nonlinear unbalanced loads.
•Using the proposed SAPF resulted in a
reduction of the original THD from 16.25%
to 3.39% or nearly five times less.
•The effectiveness of the proposed
SHCM system makes it a practical
solution for a variety of industrial
applications with need harmonic current
mitigation.

24. Thank You