The concept of a hybrid traction power supply system Viktor Sychenko, Valeriy Kuznetsov, Yevheniy Kosarev, Petro. Beh, Yuriy Sayenko, Bohdan Styslo, Mihail Pavlichenko, Ihor Vasilev and Mykola Pulin MATEC Web Conf., 294 (2019) 01014 Published online: 16 October 2019 DOI: 10.1051/matecconf/201929401014