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Telecommunication facilities are faced with the challenge of configuring a power supply that supports the network requirements as reliably and economically as possible. The telecommunication equipment generally requires 48VDC input power. Such power systems consist of multiple parallel-redundant rectifiers that convert AC power to required DC power. This power is utilized to charge lead-acid storage batteries and supply power to critical-loads. A charge controller or charge regulator is basically a voltage and/or current regulator to keep batteries from overcharging. It regulates the voltage and current coming from DC source going to the battery and load. This paper presents the improved charge controller for the telecommunication system using microcontroller (Renesas-RL78) based buck converter.

Delivering quality power is the important issue of grid connected solar photovoltaic (PV) system. The generation of quality power from the proposed system is influenced by the intermittent nature of solar photovoltaic power, power electronic converters used and the nonlinear loads connected to the system. To understand and analyze the system an accurate modeling is required. This paper deals with modeling of PV array of 100kWp grid connected photovoltaic system in the direction of providing quality power mainly related to harmonic issues at low irradiation level. The proposed system is analyzed with the help of MATLAB/SIMULINK.

Fuel cell is an efficient and clean source of electricity. Among the various types of fuel cells, Proton Exchange Membrane Fuel Cell (PEMFC) is preferred due to its less start up time and low cost. In this paper, a five level multi string inverter with converter at front end has been proposed for fuel cell applications. The design of the inverter requires only six switches instead of the conventional eight switches. The electrical model of PEMFC has been studied. The proposed multi-string inverter with fuel cell as the DC source has been simulated in MATLAB Simulink and the results are tabulated. The total harmonic distortion factor has also been tabulated.