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Grid-tie pv microinverter with isolated full-bridge boost converter controlled with the state-space feedback control method

Oliveira L. R., Barros T. A. S., Nascimento P. S., Villalva M. G., Ruppert E.

Przegląd Elektrotechniczny

2015

R. 91, nr 9

259-264

This paper presents the modeling and control design of an isolated full-bridge boost converter fed by a photovoltaic (PV) device. The converter and PV device are modeled using the method of average state variables and the controller is designed with the state-space feedback control technique, using concepts of characteristic polynomial, controllability and Ackerman’s matrix. The dynamic model of the converter is obtained and the voltage controller is designed in order to achieve the regulation of the input voltage of the boost converter, thus allowing the direct control of the PV voltage, which brings advantages when this system is compared to traditional control strategies for grid-tie PV converters.

W artykule zaprezentowano modelowanie i projekt sterowania izolowanym pełnomostkowym, przekształtnikiem typu boost zasilanym przez ogniwo fotowoltaiczne. Zbadano właściwości dynamiczne. Układ sterowania jest tak zaprojektowany żeby osiągać prawidłowy poziom napięcia.

DC-DC boost-flyback converter functioning as input stage for one phase low power grid-connected inwerter

Kawa A., Penczek A., Piróg S.

Archives of Electrical Engineering

2014

Vol. 63, nr 3

393--407

The paper treats about main problems of one phase DC-AC microinverters that allow single solar cell to be joined with the grid. One of the issues is to achieve high voltage gain with high efficiency in DC circuit, which is necessary for proper operation of inverter. The operating principles, results of practical implementation and investigations on boost-flyback converter, which meets mentioned demands, are presented. (high step-up DC-DC boost-flyback converter for single phase grid microinverter).