Portal de Periódicos da CAPES

Closed-Loop Control of a Three-Phase Neutral-Point-Clamped Inverter Using an Optimized Virtual-Vector-Based Pulsewidth Modulation

2008; Institute of Electrical and Electronics Engineers; Volume: 55; Issue: 5 Linguagem: Inglês

10.1109/tie.2008.918646

1557-9948

Sergio Busquets‐Monge, Juan Diego Ortega, J. Bordonau, J. Beristáin, Joan Rocabert,

Microgrid Control and Optimization

This paper presents a closed-loop control scheme for the three-level three-phase neutral-point-clamped dc-ac converter using the optimized nearest three virtual-space-vector pulsewidth modulation, which is a modulation that produces low output-voltage distortion with a significant reduction of the dc-link capacitance. A new specific loop modifying the modulating waveforms is proposed to rapidly control possible perturbations in the neutral-point voltage balance. An online estimation of the load displacement angle and load linear/nonlinear nature is introduced at no extra cost. The remaining part of the control is analogous to the control for a two-level converter with an appropriate interfacing to the selected modulation. The closed-loop control is designed for the case of a renewable-energy source connected to the ac mains, and its performance is analyzed through simulation and experiments.