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Non-Line-Start Permanent Magnet Synchronous Machines (NLSPMSMs) have no damping windings in the rotor and hence cannot start themselves directly to the grid. For applications where a constant speed drive is preferred, NLSPMSMs are required to be driven by the grid. Therefore, inverter aided soft startup and soft stop of such kind of motors are necessary. In this paper, a modified method of switching...
This paper presents the design and control methods for a modular multilevel converter (MMC) based back-to-back (BTB) system. A 20kW, 50Hz three phase downscaled prototype is constructed to show the working principles, hardware design procedures, and control circuits implementation. In this prototype, there are two MMC stations, namely the inverter and the rectifier, each consisting of 18 full-bridge...
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