Harmonic detection using PQF with fundamental positive sequence voltage detector for co-phase AC electric railway systems

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Published: Jun 1, 2024
Keywords:
harmonic detection positive sequence voltage detector PI controller active power filter power quality improvement

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Twin Udomkitpanya
Power Electronics, Energy, Machines and Control Research Group, School of Electrical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000
Tosaporn Narongrit
Power Electronics, Energy, Machines and Control Research Group, School of Electrical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000

Abstract

This paper presents the harmonic detection using PQF in combination with the fundamental positive sequence voltage detector (Fundamental Positive Sequence Voltage Detector : FPSVD) for co-phase AC railway systems. The proposed method is used to calculate the reference current for harmonic compensation of the shunt active power filter (Shunt Active Power Filter : SAPF), both in cases where the voltage source of the railway system is a pure sinusoidal waveform and in cases where the voltage source of the railway system is distorted due to harmonics. Harmonic detection tests in co-phase AC railway systems apply hardware in the loop simulation techniques using Simulink/MATLAB software with the TMS320C2000TM Experimenter Kit DSP board. The simulation results for the case where the voltage source of the railway systems is a pure sinusoidal waveform found that harmonic detection using the PQF method can calculate the reference current more accurately and flexibly than the conventional PQ method. As a result, the percentage of total harmonic distortion (%THD) after compensation at the three-phase power system, which is the Point of Common Coupling (PCC) is less than 0.42%. In cases where the voltage supply of the railway systems is distorted. It was found that harmonic detection by the PQF method combined with the FPSVD method has better performance than using only the PQF method, resulting in the shunt active power filter effectively removing harmonics in co-phase AC railway systems, and %THD after compensation at the PCC point is less than 0.86%. Moreover, the %THD after compensation of the source current decreases within the framework of IEEE Standard 519-2014.

Article Details

Issue
Vol. 17 No. 2 (2024)
Section
บทความวิจัย (Research Article)

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