A Real-Time Real-Power Emulator of a Medium-Voltage High-Speed Induction Motor Coupled with a Mechanical Load

This paper provides an experimental discussion on a real-time real-power emulator that play as important role in achieving a total test of medium-voltage, high-power, high-speed induction motor drives. The use of the emulator brings cost and time savings to the test. The test bench including the emulator is characterized by connecting two identical modular multilevel double-star chopper-cell (DSCC) converters in front-to-front (FTF). This paper designs, builds, and tests a 400-V
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, 10-kW downscaled test bench in which one DSCC converter is used as an inverter under test, and the other as a real-time real-power high-fidelity emulator of an induction motor coupled with load. Experimental waveforms obtained from the downscaled test bench confirm that the emulator can reproduce the electrical and mechanical operating performance of a three-phase 200-V, 10-kW, four-pole, 9000-r/min induction motor loaded with a centrifugal compressor.