ตรงใจ ฐ. The Comparison of Shunt Active Power Filter Structure for the Harmonic Elimination in AC-Electric Railway Systems. sej [internet]. 2018 Aug. 31 [cited 2025 Dec. 6];13(2):38-51. available from: https://ph02.tci-thaijo.org/index.php/sej/article/view/121880