Designing of stand alone small scale wind turbine for battery charging application

Author: . Chandanpreet Kaur

Chandanpreet Kaur, ., 2021 Designing of stand alone small scale wind turbine for battery charging application, Flinders University, College of Science and Engineering

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The increase in fossil fuel costs and global warming issues lead to the popularity of renewable energies. Wind and solar energy are two main sources of green energy which have been widely used in large and small-scale power plants. In small-scale power plants, consumers are storing the additional generated energy in a battery pack. The battery packages are charged in the constant current or constant voltage charging process where the battery state of charge (SOC) determines the charging type. Therefore, a controller is required when the generated energy is stored in the battery. The charge controller consists of a power converter and its controller system. The permanent magnet synchronous generators (PMSGs) are usually utilized in small scale wind generators due to their high power density. In this thesis, a 1.1kW wind turbine equipped by PMSG is investigated for the design of the charge controller. The wind turbine which operates independently from the power grid supplies a small load and a battery package. A 12V 30Ah battery package and 150W constant load is assumed as the loads of the system. A charged controller is designed to provide a regulated voltage for the system load in a wide range wind speed. Both the constant load and battery package are supplied through a constant DC-link where a boost converter provides a regulated voltage for the constant load, the main power converter of the charge controller is a buck converter. The elements of the buck and boost converter are designed based on the required power and voltage level. The control loops of these converters are optimally designed to deliver the power with a regulated voltage. The proportional and integral gains of the control loops are determined using the Characteristic equation derived from the transfer function of the overall system consisting of DC-DC buck converter and PI controller. The results demonstrate the designed controller can deliver the required power properly to the load and battery package.

Keywords: Stand alone Wind turbine, Horizontal WT, permanent magnet synchronous generator, battery, PI Controller, Buck converter, Rectifier

Subject: Engineering thesis

Thesis type: Masters
Completed: 2021
School: College of Science and Engineering
Supervisor: Amin Mahmoudi