Fuzzy Logic Control Based Standalone Wind Energy Conversion System For Dc Base Telecom Loads

Abstract

Abstract:The main demand for renewable energy resources is increase in the price and limited availability of conventional energy resources. Available alternative sources of wind energy are neat and clean but due to the intermittent nature it can need back up. In order to ascertain continuous supply of potency felicitous storage technology is utilized as backup. In this paper, the sustainability of a 4-kW hybrid of wind and battery system is investigated for meeting the requisites of a 3-kW stand-alone dc load representing a base telecom station. A charge controller of battery bank charging and discharging depends on Fuzzy logic controller predicated maximum power point tracking and battery state of charge. The mechanical safety and electrical safety of wind energy conversion system is achieved by using pitch control technique. Both the control schemes are integrated and the efficacy is validated by testing it with various load and wind profiles in MATLAB/SIMULINK. [7]. In order to extract maximum power form WECS the turbine needs to be operated at optimal angular speed [7]. The BTS load requirement is modeled as a dc load which requires a nominal regulated voltage of 50 V. The WECS is interfaced with the standalone dc load by means of rectification ac-dc and buck converter dc-dc to regulate the load voltage at the desired level. The proposed control scheme utilizes the turbine maximum power tracking technique with the battery State Of Charge(SOC) limit logic to charge the battery in a controlled manner. The MPPT logic [8] used here actually forces the turbine to operate at optimum Tip Speed Ratio(TSR) and hence is parameter independent. The battery charging current is always continuous with very low ripple thus avoiding harmonic heating. The change over between the modes for battery charging is affected based on the actual value of the SOC. Further it also provides protection against turbine over speed, over loading, and over voltage at the rectifier output by using pitch control [9].