Saint Petersburg Mining University, Saint Petersburg, Russia:

B. N. Abramovich, Professor at the Department of Electrical Power Supply and Electromechanics, Doctor of Technical Sciences, e-mail: abramovich_bn@pers.spmi.ru
A. A. Veprikov, Assistant Lecturer at the Department of Electrical Power Supply and Electromechanics, Candidate of Technical Sciences, e-mail: veprikov_aa@pers.spmi.ru
Yu. A. Sychev, Associate Professor at the Department of Electrical Power Supply and Electromechanics, Candidate of Technical Sciences
D. A. Lyakh, Postgraduate Student at the Department of Electrical Power Supply and Electromechanics

The paper presents the research data of energy characteristics of the electrical power converter complex based on switch-mode power source (SMPS) units with IGBT used to power industrial non-ferrous electrolyzers. Conducted researches have shown the possibility of increasing the load current by increasing a number of IGBTs in parallel connection and established criteria for calculating number of paralleled semiconductors blocks. It is shown that SPMS-based converter complex allows to decrease specific energy consumption, consumption of reactive power and installed power of electrical equipment while still providing a smooth adjustment of the load current. To improve the quality of electrical energy in power networks with industrial high-current DC consumers a structure for converter complex based on current-source buck-type active rectifiers has been proposed. It is demonstrated that desynchronizing switching processes of active rectifiers will reduce the total harmonic distortion of the mains voltage. On the basis of the conducted researches, it has been revealed that utilizing current source buck-type active rectifiers with parallel connection of IGBT modules as a part of electric power converters for electrolyzers electrical power supply significantly improves its efficiency. The considered types of converters allows for smooth and precise load current control within a wide range, without reducing the overall power factor. It has been shown that the usage of active rectifiers to minimize reactive power, distortion power while providing required load voltage in the range from 80 to 100% of rated value allows to reduce installed power of transformer equipment by 20–40% by removing on-load-tap-changer device. Reducing the harmonics of voltage and current by desynchronization of switching processes in active current source buck-type rectifiers will increase the electromagnetic compatibility of the converter complex and power supply network, thus increasing the service life of the electrical equipment.

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