A new control strategy to improve the performance of a PWM AC to DC converter under unbalanced operating conditions
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| Title | A new control strategy to improve the performance of a PWM AC to DC converter under unbalanced operating conditions |
| Publication Type | Conference Paper |
| Year of Publication | 1993 |
| Authors | Enjeti PN, Choudhury SA |
| Conference Name | Power Electronics, IEEE Transactions on |
| ISBN Number | 0885-8993 VO - 8 |
| Keywords | AC generators, AC-to-DC power converter, Analog-digital conversion, DC generators, gating signals, GTO, harmonics, performance, power convertors, Power generation, Power system harmonics, Pulse generation, Pulse width modulation, Pulse width modulation converters, PWM, real time, Switching converters, thyristor applications, Thyristors, unbalanced operating conditions, Voltage control |
| Abstract | Abnormal harmonics of significant magnitude are generated at the output and input terminals of a PWM (pulse-width-modulated) AC-to-DC power converter under unbalanced operating conditions. A new control strategy is presented to selectively cancel the generated lower-order abnormal harmonics at the output and input terminals and thereby to preserve the high-performance features of a PWM AC-to-DC power converter. The proposed technique essentially involves computing the sequence components of the unbalanced input supply and suitably counter-unbalances the PWM gating signals of the power converter switches to cancel the generated abnormal harmonics. The technique is essentially a feedforward approach and is suitable for higher-power GTO (gate turn-off thyristor) type PWM AC-to-DC power converters. A procedure for implementing this technique in real time is discussed. Selected results are verified experimentally on a prototype PWM AC-to-DC power converter |
| DOI | 10.1109/63.261020 |
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