Adaptive Dead-Time Compensation for Grid-Connected PWM Inverters of Single-Stage PV Systems

MARIO ALEJANDRO HERRÁN; JONATAN FISCHER; GONZÁLEZ, SERGIO ALEJANDRO; MARCOS GABRIEL JUDEWICZ; DANIEL OSCAR CARRICA

IEEE TRANSACTIONS ON POWER ELECTRONICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2013 vol. 28 p. 2816 - 2825

0885-8993

This work presents a new software-based dead-time compensation method for grid-connected PWM voltage-source inverters of single-stage photovoltaic (PV) systems that employ Predictive Current Controllers (PCC) to regulate phase currents. First, a non-linear dead-time disturbance model is reviewed, which is used for the generation of a feed-forward compensation signal that eliminates the current distortion associated with current clamping effects around zero-current crossing points. A novel closed-loop adaptive adjustment scheme is proposed for finetuning in real time the compensation model parameters, thereby ensuring accurate results even under the highly varying operating conditions typically found in PV systems due to insolation, temperature and shadowing effects, among others. The algorithm implementation is straightforward and computationally efficient. Experimental results with a 5kW PV system prototype are presented.