Hybrid Inverter and Control Strategy for Enabling the PV Generation Dispatch Using Extra-Low-Voltage Batteries

Luiz Henrique Meneghetti, Edivan Laercio Carvalho, Emerson Giovani Carati, Gustavo Weber Denardin, Jean Patric da Costa, Carlos Marcelo de Oliveira Stein and Rafael Cardoso ()
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Luiz Henrique Meneghetti: Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Pato Branco 85503-390, PR, Brazil
Edivan Laercio Carvalho: Department of Electrical Power Engineering and Mechatronics, Tallinn University of Technology (TalTech), 19086 Tallinn, Estonia
Emerson Giovani Carati: Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Pato Branco 85503-390, PR, Brazil
Gustavo Weber Denardin: Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Pato Branco 85503-390, PR, Brazil
Jean Patric da Costa: Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Pato Branco 85503-390, PR, Brazil
Carlos Marcelo de Oliveira Stein: Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Pato Branco 85503-390, PR, Brazil
Rafael Cardoso: Department of Electrical Engineering, Universidade Tecnológica Federal do Paraná (UTFPR), Pato Branco 85503-390, PR, Brazil

Energies, 2022, vol. 15, issue 20, 1-20

Abstract: This paper proposes a dispatchable photovoltaic (PV) hybrid inverter for output power tracking without any dependency on the converter’s efficiency and with no power closed loop. The system uses an extra-low-voltage battery energy storage system (BEES) based on a Li-ion battery pack to be applicable for use inside homes and other installations close to the end-user. A bidirectional isolated current-fed dual-active bridge (CF-DAB) converter associated with the batteries provides a wide conversion voltage ratio and ensures safety for the users. The proposed control system shares the DC bus voltage controller between the ac grid interfacing converter (AC-DC) and CF-DAB (DC-DC), eliminating the converter’s efficiency in the reference equations. When dispatchable power is not required, or according to the user’s request, the battery’s charge/discharge current can be specified. A disturbance rejection technique avoids low-frequency current ripple on the battery side. It contributes to the battery’s lifespan. Experimental results presenting the dc bus voltage control, current disturbance rejection, and power dispatching are included to validate the proposal.

Keywords: hybrid inverter; photovoltaic generation dispatch; battery energy storage; disturbance rejection; control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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