|Paper title: CLOSED LOOP DISCONTINUOUS PULSE WIDTH MODULATION CONTROL USED IN INVERTER GRID-CONNECTED PHOTOVOLTAIC SYSTEM FOR REDUCED SWITCHING LOSSES
Author(s): SID-AHMED TOUIL, NASSERDINE BOUDJERDA, AHSENE BOUBAKIR, KHALIL EL KHAMLICHI DRISSI,
This paper proposes a novel control of a direct grid-connected photovoltaic (PV) system using solely a three-phase inverter.
Considering the large amount of energy transmitted to the network, we use the so-called discontinuous pulse width modulation
(DPWM) technique for driving the inverter in closed loop, which reduces the number of commutations by about 33 %, resulting
in an important decrease of the switching losses. The operation of the PV source at the maximum power point (MPP) and the
control of the reactive energy injected into the network are performed using a designed robust sliding mode controller (SMC).
The performances of the proposed system are evaluated through some simulation results, which highlight the effectiveness of the
proposed SMC to achieve good control of the grid connected PV system. Additionally, the generalized discontinuous pulse width
modulation strategy implemented in closed loop opens a new approach to the reduction of the switching losses in the PV inverter
and may apply in other converters topologies for renewable energy systems.
Keywords: Discontinuous pulse width modulation, Photovoltaic system, Sliding mode control, Switching losses, Dc-ac inverterYear: 2019 | Tome: 64 | Issue: 4 | Pp.: 357-363
Full text : PDF (673 KB)