Abstract
A grid-connected inverter is often controlled digitally and there is a control time delay, which is inevitable due to A/D conversion, computation times, etc. This delay degrades the stabilities and damping effects of the inverter because the frequency characteristics are different from the designed one especially around the resonant frequency of the filter and they have large amplitude peaks and phase-shifts. This paper proposes a simple and effective compensation method of the control time delay. It is based on a new predictive estimation method of future state values advanced by the delay time. It is applied to compensate a feed-back (FB) and feed-forward (FF) stabilization method for an inverter system which has a good tracking characteristic by the FB control and has a passive characteristic for stability by the FF control. Its effectiveness of the proposed compensation is investigated and validated theoretically and experimentally by a DSP-based digital control system.
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