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The document discusses selective harmonic current mitigation using a shunt active power filter (SAPF). It describes various harmonic detection methods and the operating principle of active power filters. The proposed selective harmonic current compensation method uses an SAPF to extract the fundamental component of current for the nonlinear and unbalanced loads, and selectively compensate the fifth harmonic. Simulation results show the total harmonic distortion is reduced from 16.25% to 3.39% using this selective harmonic current mitigation approach.
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
- 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