Dual Port Impedance Converter for PV – Battery fed Remote Telecom Towers

Abstract

Base Transceiver Station (BTS) installed in difficult terrains with photovoltaics support require battery backup to provide a suitable and uninterrupted power solution. This paper proposes a multiport impedance source converter interfacing photovoltaic panel on unidirectional port and battery stacks at bidirectional port to feed power to the telecommunication DC microgrid through a single unit of converter. The proposed topology employs continuous input modified T type impedance networks capable of boosting in normal operating conditions and providing extra boost during shoot through conditions exhibiting wide operating range for PV applications. Modular and power dense architecture allows single control algorithm to govern the converter operation under normal and intermittent conditions for both extraction of power from PV and controlling of quantum of charging/ discharging current into / from the battery. The converter response is simulated under MATLAB environment and analyzed under charging discharging conditions of battery under intermittent operation of photovoltaic system including partial shading to affirm the uninterruptable support to telecommunication tower.