Ivan Kuraj

In modern electric power systems and industrial plants, there are loads that require absolute continuity and reliability of power supply, where any interruption can lead to severe technical and financial consequences. Although monolithic uninterruptible power supply systems have long represented the industry standard, their limitations regarding scalability, lack of internal redundancy, and long repair times are driving a gradual transition toward more advanced technological solutions. The introductory part of this lecture analyzes the shift to a modular architecture, highlighting its essential advantages in terms of high availability, hot-swapping, and easy adaptability to growing load demands. The central part of the presentation is dedicated to the promotion and technical analysis of the latest generation of modular uninterruptible power supply systems developed at the Nikola Tesla Institute. The development concept of these devices, designed to meet the most stringent requirements of industrial applications, will be presented. The presentation will cover the key performance indicators of our converters, with a special focus on energy efficiency, component reliability, and advanced digital control based on modern microcontroller platforms. To highlight the technological progress, the improvements achieved in this new generation of devices compared to traditional solutions will be explained in detail. Through topology optimization, high switching frequencies, and the application of advanced control algorithms, higher power density, a significantly faster dynamic response to sudden load changes, and further reduced harmonic distortion of the grid voltage and current have been achieved. The ultimate goal of the lecture is to demonstrate to the professional public how domestic engineering development in the field of power electronics results in innovative and competitive solutions that represent a reliable pillar of stability for modern electric power systems.

Keywords: Inverter, Rectifier, Battery charger, Static switch, Uninterruptible power supply