Quasi-switched inverter using space vector pulse width modulation with triangular comparison for photovoltaic applications

Iván F. Moran, José A. Restrepo, Martha L. Orozco-Gutierrez, José M. Ramirez-Scarpetta

Abstract


This work analyzes a prototype for of a quasi-switched boost inverter (qSBI) feeding an isolated resistive load from a DC source. The use of a spatial vector pulse width modulation (SPWM) with triangular comparison is proposed to give an increase in the qSBI gain factor, and its performance is contrasted with another types of spatial vector modulations, such as discontinuous modulations. To verify the validity of the method for voltage range extension in the qSBI converter, a semi-customized test platform was developed. This platform uses a DSP floating point card (Analog Devices ADSP-21369) for processing and control strategies, and an interface card that includes a programmable logic array (FPGA) from Xilinx (Spartan-3), which allows the to develop development of the synchronized modulation that the qSBI needs. The experimental results show improvements in the performance of the qSBI converter in terms of the gain factor, voltage reduction in the capacitor, and the input current profiles. The dDiscontinuous space vector modulation strategies do not perform well when compared to the continuous SVPWM or SPWM modulations, since because the ripple levels in the currents taken from the PV module are approximately twice as great as in the case of continuous modulation techniques. Finally, the usage ofthe usefulness of the a qSBI as PV microinverter is put into evidence confirmed by two practical experimental cases of a PV photovoltaic system with a maximum power point adjustment algorithm (MPPT).

Keywords


Quasi-Switched Boost Inverter; Space Vector Modulation; Sinusoidal Modulation; Embedded System; PV Microinverter

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