Hyun-Woo Kim, Yu-Ran Go, Myung-Hwan Min, Tae-Pung An, Tae-Hoon Lee, 2019, Study on
the Parallel Operation of Active Balancer for Unbalanced Load in AC Electric Railway
System, The transactions of The Korean Institute of Electrical Engineers, Vol. 68,
No. 11, pp. 1489-1496