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ELIMINATING THE HARMONICS FROM MEASURED CURRENT VALUES IN PWM DRIVES
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| Author(s) |
F. Bauer; G. Heinle |
| Abstract |
ln electric drive systems the stator currents and voltages are measured for control purposes. PWM inverter operation inherently produces harmonic voltages and currents along with the desired fundamental frequency. These harmonics cause harmonic components in the measured signal. The consequences are: distortion in the reference voltages, lower permissible amplification of the current regulators with a resulting impairment of dynamic behaviour and a limited stability range for the control system. For high drive system performance, stator quantities are needed which are devoid of inverter-induced harmonics. A method is introduced that eliminates such harmonics from the measured signal. lt enables the harmonic-free measuring of currents and voltages synchronously and non-synchronously with the pulse patterns. This proposed correction method enables to obtain suitable mean values of fundamental-frequency quantities for all three phases to serve further processing purposes. The method can be implemented bath on-line or off-line and can be employed for either two-level or three-level inverters. |
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| Filename: | Unnamed file |
| Filesize: | 3.322 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-15 by System |
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