Model Predictive Torque Control with Fault Tolerance for PMSG Based on Vienna Rectifier

Yong, Dek Wei (2022) Model Predictive Torque Control with Fault Tolerance for PMSG Based on Vienna Rectifier. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

The demand of energy by using renewable energy resource is increasing rapidly around the world. Wind energy is well known as a clean, cost effective and sustainable type of energy. In order to generate electricity from the wind energy, a wind energy conversion system (WECS) is designed based on several criteria to ensure high power quality generation with lower cost. The major components in a WECS are the wind turbine, generator and the power converter. In this project, the performance of permanent magnet synchronous generator (PMSG) based WECS using Vienna rectifier under normal operation has been investigated through MATLAB Simulink. The control algorithm that applied to Vienna rectifier is called as model predictive direct torque control (MPDTC). This MPDTC method will select the optimal switching vector to the Vienna rectifier by predicting next optimum state of torque and flux of the PMSG. It will significantly reduce the electromagnetic torque and stator flux error of PMSG as well as maintain the balance of DC-link voltage of the WECS. Also, the performance of MPDTC method to PMSG under Vienna rectifier open and close switch fault conditions has been investigated. The major cause of power converter failure is due to open and short switch fault. When these faults occurred, it may affect the overall performance of WECS and lead to maloperation of the system if there is no any protection scheme being implemented. Thus, an open and short switch fault detection model is being developed based on the current characteristic of PMSG under faulty Vienna rectifier condition. The result shows that, the MPDTC method is able to control the speed of PMSG under short switch fault condition of Vienna rectifier. However, the three phase current generated by the PMSG under this condition is tends to have power quality issue. Under open switch fault condition, the current generated and the speed of PMSG is unbalance and totally out of control.