PWMインバータの正弦波追従ディジタル制御法

概要

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Fast responses without any steady-state errors 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 voltages. 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 simple numerator and a denominator z2-2z cos ωT + 1 of a transfer function which is equal to the z function of a sinusoidal waveform of the angular frequency ω and the sample time T. Compensator and feedback gains of the inverter are determined by the optimal control principle. The proposed method is investigated for actual performances and it is validated through theoretical and experimental results for linear and nonlinear loads by using a DSP system at the switching frequency of 20kHz.
2006-03-01