With fast microprocessors and suitable switching devices such as GTO thyristors CSI-drives are considerably improved. Sinusoidal input and output currents are replacing the block-shaped currents of sequentially commutated inverters and a sophisticated control permits fast dynamic response. To achieve this goal, the resonant circuit consisting of the capacitors at the inverter terminals and the machine inductances has to be kept under close control. With an online calculation of the PWM switching times, not only the voltages but also the currents are maintained very close to the reference value, even at limited switching frequency. Measurements at the machine side converter show the distinctive features of this drive system at various operating points.
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