Implementation of a digital excitation control system to reduce the third harmonic and improve voltage quality in a synchronous generator

Abstract

With the development and spread of electrical equipment that contains rectifiers and inverters, which are considered non-linear loads, where the shape of the voltage wave is different from the shape of the current wave, and thus causes distortion of the voltage wave and loads it with different harmonics according to the type of load.

Getting rid of the harmonics and preserving the pure sinusoidal form of the voltage wave is considered one of the important issues in the electrical distribution and feeding systems, especially the systems independent from the network, because of the problems caused by these harmonics in increasing heat, losses, noise, and other undesirable conditions.

In this research, we will implement a digital system to control the excitation of the synchronous generator so that the generator is able to feed the load with regular voltage, in addition to mitigating the harmonics and reducing their ratio when loaded with nonlinear loads without changing the structure of the generator, but only by controlling the excitation wave shape.