Hysteresis Current Control for Permanent Magnet Synchronous Generator Based on Multilevel Vienna Rectifier

Low, Jing Wei (2022) Hysteresis Current Control for Permanent Magnet Synchronous Generator Based on Multilevel Vienna Rectifier. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

The high demand of electricity and the increase of carbon emission by fossil power plant has led to the rising in utilization of renewable energy including wind energy. Power converters are used in the wind turbines because they make it possible to control the speed and generate steady power to be fed to the utility grid. In fact, a two-level converter is more suitable for low power application. For medium and high power application, the performance of the two-level converter is not optimum and the voltage stress across the semiconductor switches is high due to limited voltage level, causing it to be unreliable. To cope with the high-power generation from the wind energy, multilevel converter has been introduced as an alternative to two-level converter. The input current of generator based on multilevel converter is smoother and has less harmonic as there are more stepped level of voltage. A three phase five-level Vienna rectifier will be constructed using MATLAB Simulink to control the speed of the Permanent Magnet Synchronous Generator (PMSG). The feasibility of this topology and its control strategy is studied. The results will be compared to that of the three phase three-level Vienna rectifier. The control strategy used to control five-level Vienna rectifier is known as variable band multilevel hysteresis current control whereas an existing conventional hysteresis current control is used to control three-level Vienna rectifier. Both topology is feasible but the total harmonic distortion (THD) for five-level Vienna rectifier is lower than three-level Vienna rectifier.