Storage-less PV Fed Telecom Power Supply using High Gain Boost and Resonant Power Converter Configurations

摘要

To cater the need of expanding telecom network to rural areas with quality power supply poses a challenge as many areas are still unapproachable to the grid. PV based generation is envisaged to alleviate the problem providing maintenance free and robust in working in low operating cost. The proposed telecom power supply uses a high gain DC-DC MPPT converter having high efficiency and very low current ripples through two interleaved inductors to power 380V DC bus to cater Base Transceiver Station (BTS) and retrofit Auxiliary/Data Center loads. The topology provides isolation to avoid common mode problems/leakage currents together with low stresses on the switches making it robust and highly efficient. A LLC resonant converter is also proposed to cater the BTS load at 48V from the DC bus to supply constant voltage at constant power with high hold up time amidst large voltage variations. The proposed control operates the two converters at different range of frequencies such that possibility of interference with each other is totally eliminated. For realizing storage-less operation the load controller is also employed which equalizes the power based on insolation changes and load perturbations. The topology is verified in MATLAB-Simulink environment and tested for various disturbances and perturbation on DC bus.