Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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UPQC-based effective mitigation of harmonics by signal processing approach

  • Nagarajan, Ananthan (Department of Electrical and Electronics Engineering, Vel Tech Multi Tech Dr. Rangarajan Dr. Sakunthala Engineering College) ;
  • Suganyadevi, M.V. (Department of Electrical and Electronics Engineering, Saranathan College of Engineering)
  • Received : 2021.08.21
  • Accepted : 2021.12.02
  • Published : 2022.03.20
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Abstract

This paper introduces a solution for solving the harmonics problem in power distribution systems. The unified power quality conditioner (UPQC) is a combination of shunt and series converters linked by a common capacitor. Controlling the link voltage and generating the reference current are the two main objectives of this work. An adaptive PI controller is employed for regulating the link voltage. For reference current generation, the DDSRF (decoupled double synchronous reference frame) theory is employed, which assists in eliminating the harmonics that occur in the system. By the DDSRF theory, a THD of around 3.3% is accomplished, and to further minimize the harmonics, a signal processing approach is implemented. Pre-processing, segmentation and feature extraction are the three major steps used in this paper to accurately extract the reference current. Finally, the obtained test data is classified with the trained data by the DCNN (deep convolutional neural network). Thus, the reference current is extracted clearly by this technique, and the THD is minimized to 0.98%. This work is implemented in MATLAB, and the results are verified through hardware implementation.

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References

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