International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The structural scheme of the distributed power supply system with the use of solar photovoltaic stations is presented. An algorithm for the conversion of a solar photovoltaic power plant conversion system in the Matlab software environment has been developed and implemented, which allows using a standard power topology to simultaneously implement two operating modes – renewable energy generation to the mains and mains current shape correction.

Implementation of the principles of “INDUSTRY 4.0” into the traction power supply systems implies the introduction of power factor correction modes and the possibility of bi-directional energy transfer in the DC traction substations used on railways and subways. The article provides an overview and comparison of active rectifier circuits, which allow to realize power factor correction and eliminate the higher harmonics of the input current. A number of requirements are presented, on the basis of which the optimal scheme for the rectifier of the traction substation was chosen.

Among the main problems of the induction furnaces are the clearly manifested worsened power factor during operation, the asymmetry, the deflection and the variance of the supply voltage in their power supply. Induction furnaces in all their operating modes are a non-linear load with significant and varying consumption of active and reactive energy. Compensation devices are set for the heaviest mode of operation – metal melting. There remains a question of the limits of the low inherent power factor for individual regimes, the size of the penalties for this on an annual basis, and the potential energy saving measures taking into account the possibilities of waste heat utilization. In this connection, the task of implementation of modern optimal management according to predefined criteria is current.