Frequency fluctuations of electric machines in systems with frequency converters and fluctuation suppression algorithms

Electromechanical processes in systems with frequency converters and electric machines, which are characterized by fluctuations in machine speeds, currents and voltages, are considered. In drives with rectifiers, capacitor filters, transistor inverters and asynchronous motors in some cases there are fluctuations of filter voltages and motor speeds, leading to emergency shutdown. In systems with thyristor frequency inverters with a DC link and synchronous machines at the start-up of machines in the zones of artificial commutation there are fluctuations of rotation frequencies and currents, which can also lead to emergency shutdown. A control algorithm based on the use of oscillations of constant capacitor voltages in transistor drives or excitation voltages of synchronous machines and the effect of these oscillations on the frequency of inverter control pulses is proposed.

Authors: A. G. Vorontsov, M. V. Pronin1, G. G. Rozbitskiy

Direction: Electrical Engineering

Keywords: turbogenerator, induction motor, thyristor frequency converter with DC link, transistor frequency converter with diode rectifier, control pulses, control system, excitation voltage, rectified voltage

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