A Harmonic Voltage Elimination in Electric Railway System Using Series Active Power Filter

Harmonic distortion has been a big problem in railway electrification systems because high-speed trains create harmonics in the distribution grids of railway electrification systems. Thus, for the efficient use of high-speed trains, the harmonic voltage must be improved for the railway electrification system. This paper proposes compensating voltage control in cooperation with a series active power filter (SAPF) using the PI controller for harmonic voltage elimination. In addition, the harmonic voltage detection with a positive sequence voltage detector (PSVD) is presented in this paper. To verify the proposed harmonic voltage elimination, the processor-in-the-loop (PIL) simulation technique was applied to the proposed system. Matlab/Simulink program was utilized to model the electric railway system, while the overall control of SAPF were implemented digitally with CCStudio program on the eZdspTM F28335 board. The results of the PIL technique testing show that the SAPF with the proposed control can show the good performance of eliminating harmonic voltage distortion. Consequently, the percentage of total harmonic voltage distortion (% THD
V
) that is in line with IEEE Standard 519-2014.