A non‐isolated bidirectional high gain integrated multiport converter for grid tied solar PV fed telecom load

Abstract

A multiport converter (MPC) with a non-isolated high gain bidirectional port is proposed for the grid integration of solar photovoltaic array (SPA) fed telecommunication load. The SPA along with a battery energy storage (BES) meets the power demand of the telecom DC load and the excess/deficit power is exchanged with AC grid. The MPC feeds the DC link of a voltage source converter for bidirectional operation with the AC grid. The small signal analysis of the converter shows that its operation is stable. The SPA, BES, and telecommunication load are rated for lower voltages, consecutively reducing the complexity with series-connected SPA. The proposed MPC possesses the merits of high voltage gain, reduced inductor size, and reduced number of components. Moreover, a power flow management algorithm is devised for the proposed converter that regulates the DC voltage at the telecom load and ensures smooth power flow control among various ports. The MPC is able to operate at various modes by controlling the ports independently. The converter performance during steady state and dynamic operating conditions under various modes are analyzed with detailed simulation studies. An experimental prototype is developed and test results are demonstrated to prove the viability of the designed converter.

Control of Converter for a Solar PV-BESS Powered Telecom Load With Real, Reactive and Harmonic Power Exchange With Grid

“…The MPC has only unidirectional HV load port and has a coupled inductor for voltage boosting. A nonisolated multiport converter for grid integrated PV system demonstrates higher efficiency [28] but is having more inductors in the converter. A non-isolated bidirectional HV port for AC grid integration is presented in [29] with an MPC and is demonstrating power flow management control to extract MPP of PV array and to regulate DC load voltage under dynamic variations in PV power.…”