Journal of Electrical Engineering : Volume 17 / 2017 - Edition : 1

CURRENT SHARING IN PARALLELED CONNECTED LUO CONVERTERS FOR STANDALONE PHOTOVOLTAIC SYSTEM

Authors:
M.R.Geetha
R.Suja Mani Malar
T.Ahilan
Domain:
power electronics
Abstract:
This paper proposes a new current sharing scheme for solar integrated parallel connected positive super lift LUO converters (PSLLCs). The proposed current sharing scheme consists of two loops, an outer voltage loop and an inner current loop. The outer voltage loop ensures voltage regulation using fuzzy pre-compensated PID controller. An inner current loop ensures equal sharing of load current between parallel connected converter modules. For ensuring equal sharing of load current no dedicated current sharing controller is used. Instead by sensing power input voltage, output voltage and inductor currents of parallel connected converter modules, inner current loop ensures equal sharing of load current. Since parallel connected converters are designed for renewable energy systems, the input current is used as a control parameter. PID controllers and fuzzy pre- compensated PID controllers are designed for voltage regulation and compared through MATLAB based simulation and fuzzy pre-compensated PID controllers are found to be satisfactory. The proposed current sharing scheme is implemented using PIC16F877A and the results are presented
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