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Sinusoidal Waveform Compensator For Optimal Digital Control Of PWM Inverter
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| Author(s) |
Toshiji Kato, Kaoru Inoue, Shinsaku Kuroda |
| Abstract |
Not only steady-state but also fast transient
performances are required for control of a sinusoidal PWM
inverter. Its reference voltage waveform is not constant but
sinusoidal. The output voltage is controlled to coincide with
a reference waveform. However the reference varies to be
a further value when the output reaches the value. So there
is always a deviation between the reference and the output
voltage. It is necessary to design a compensator by considering
these sinusoidal variations of the reference waveform
to get a good steady-state and fast transient response. This
paper proposes a sort of digital repetitive control systems
for a sinusoidal PWM inverter control. It is based on the
internal model principle to realize a response with no deviation
for a periodic sinusoidal reference input. It has a
denominator z2 −2 cos ùT +1 of a transfer function which is
equal to the z function of a sinusoidal waveform of the angular
frequency ù and the sample time T . Compensator and
feedback gains of the inverter are determined by the optimal
control principles. The proposed method is investigated for
actual performances and it is validated through theoretical
experimental results for linear and nonlinear loads by using
a DSP system at the switching frequency of 20kHz. |
| Download |
| Filename: | A33598 |
| Filesize: | 395 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-16 by System |
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