Siemens Robicon has set a new record with the world's largest high-speed variable frequency drive

Siemens Robicon has set a new record with the world's largest high-speed variable frequency drive.

Responsible by factory engineers August 18, 2008

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Siemens Energy and Automation announced that its Siemens Robicon Perfect Harmony Inverter has reached a technological milestone and has launched an 8 MW inverter (VFD) with an output frequency of 500 Hz, making it the world's largest high-speed VFD.

This milestone is just the latest achievement in the high-speed Siemens Robicon Perfect Harmony drive series. Although the basic VFD topology is limited to output frequencies in the range of 120 to 200 Hz, Siemens has manufactured and installed frequency converters that operate between 315 and 400 Hz.

The multi-stage structure based on the Siemens Robicon Perfect Harmony power unit provides a unique topology, which can operate at frequencies up to 500 Hz regardless of the rated power of the VFD. A VFD control test was set up to run the motor under encoderless vector control at a 920 Hz IGBT switching frequency, resulting in an effective switching frequency of 9.2 kHz and a sampling frequency of 9.2 kHz. The test drive showed high-quality waveforms to the motor with low harmonic distortion.

The latest VFD will be used to drive permanent magnet motors, such as those used in natural gas processing and transportation applications that require high-speed compression.