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Simulations of Rotating Brushless AC Excitation System with Controlled Thyristor Bridge Rectifier for Hydropower Generators (Mechanical Project)

This project aims to simulate and find out more about the electrical dynamics of a six-phase exciter for hydropower generators. Because ordinary electric circuit-based simulation software only simulate three-phase electrical systems, a FEM-based software is used for the electrical dynamics simulations of the six-phase system.

The objective is to analyse the pulsation behaviour of the rectified electrical output on the six-phase system and compare it to the three-phase system. The three-phase system is also simulated with filters with the aim of decreasing the amplitude of the pulsations on the electrical output.It is expected that an upgraded system from a three-phase system to a six-phase system should double the pulsation frequency on the rectified electrical output.

However, the result shows that the rectified electrical output of the six-phase system consists of pulsations with unexpected frequencies. The simulated RL-filter on the three-phase system shows only insignificantly small changes on the rectified electrical pulsation amplitude.
Source: Uppsala University
Author: Butros, Peter

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