Control over Grid Reactive Power by Using a Powerful Regenerative Controlled-Speed Synchronous Motor Drive

The authors propose a technique for reactive power compensation using powerful regenerative controlled-speed synchronous motor drive (SMD) based on three-level (3L) neutral point clamped (NPC) active front-end rectifier (AFE) and voltage source inverter (VSI). review of technical solutions showed that the limitations transmitted in system under consideration still have not been studied. paper provides mathematical description proposes synthesis-friendly block diagrams 3L-NPC-AFE-VSI SMD models. developed models allow defining instantaneous values total 3L-NPC-AFE consumed from grid depending load diagram. It is noted 3L-NPC-AFE-VSI-SMD designed without considering opportunities generation. was determined limit value generated by depends DC link voltage, current consumption modulation index. possibility through experimentally tested main metal plate hot rolling mill. analysis results obtained during breakdown, an can generate equal to 16% rated at overcurrent. shown generating expedient low-load operation modes or idle. Research this area promising due widespread use high-power tightening requirements energy saving efficiency supply quality. proposed control be used as part industrial smart grid.