Abstract
This paper presents a software-based adaptive dead-time compensation technique for single-phase grid-connected photovoltaic (PV) inverter system. To prevent a short circuit in the dc-link, a switching delay time is needed to be inserted in Pulse Width Modulation (PWM) signals. This causes the dead-time effect which is harmful to the system performance. To improve the mitigation of dead-time effect around the zero-crossing point of output current, an adaptive harmonic mitigation of instantaneous feedback current is used as an integrated part of conventional current controller. This dead-time compensator mitigates undesirable harmonic components from current, where only the knowledge of frequencies is needed. The simulation and experimental results are shown to verify the effectiveness of proposed dead-time compensation method in single-phase grid-connected power distributed generation systems.
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