Computer-based model of electric propulsion drive for Project 22220 multi-purpose nuclear icebreaker

Object and purpose of research. The object of this study is electric propulsion drive of the electric propulsion system aboard Project 22220 multi-purpose nuclear icebreaker now under construction. The purpose of the study is to developcomputer-based model of electric propulsion drive for this icebreaker. The drive is frequency-regulated and has vector control algorithm. The model is intended to both analyse electromechanical processes taking place in the channels of the electric drive and to synthesize its control system. Materials and methods. The study was based on scientific & technical information available in literature on electric drive theory, as well as on personal findings of the authors and on their profound experience accumulated over many years of R&D in the sphere of marine electric propulsion systems. Solution to this problem is based on the possibility to simulate various electromechanical equipment and systems by means of Simulik application software and Sim Power Systems block library of MatLab package. Main results. The computer-based model developed under this work and representing electric propulsion drive of Project 22220 multi-purpose nuclear icebreaker makes it possible to investigate electromechanical processes taking place in different operational conditions of this drive. Virtual oscillograms were obtained for currents, voltages, RPM, power, electromagnetic moment, etc. These oscillograms characterize operation of the electric drive in the conditions of RPM regulation, power regulation, change of rotation direction, shaft cranking, ice milling, propeller jamming, decrease and increase of static load moment. The model can also be used to update the software governing microchip-based control system of the electric drive (this update becomes necessary during pre-commissioning set-to-work activities). Conclusion. The model of electric propulsion drive for Project 22220 icebreaker is an engineering tool that enables, already at early design stages, investigation and analysis of electromechanical processes: these data are necessary for proper selection of electric drive equipment. After corresponding update, this model can be used in detailed design of electric propulsion plants for ice-breaking ships of other designs.