A.L. Kulikov - Dr. Sc. (Eng.), Professor, Department of «Electric power engineering, electricity supply and power electronics», Nizhny Novgorod State Technical University n.a. R.E. Alekseev E-mail: inventor61@mail.ru V.V. Ananyev - Post-graduate Student, Department of «Electric power engineering, electricity supply and power electronics», Nizhny Novgorod State Technical University n.a. R.E. Alekseev E-mail: an-vitek@ya.ru V.Yu. Vukolov - Ph. D. (Eng.), Associate Professor, Department of «Electric power engineering, electricity supply and power electronics», Nizhny Novgorod State Technical University n.a. R.E. Alekseev E-mail: vvucolov@mail.ru