Variable Excitations Effect on the Output Voltage in the Synchronous Generator

Abstract

The synchronous generator is the main source of electrical energy. It is considered the largest power transformer in the world. It converts mechanical energy into electrical energy. Usually, the synchronous generator is excited by direct voltage to form a number of magnetic poles that rotate at synchronous speed to produce electrical energy.

Because of the nonlinear loads connected to the synchronous generator, it can cause the distortion of voltage wave, thus we need to improve the voltage waveform.

In this paper, the effect of excitation of the synchronous generator with variable voltage on the form of the produced voltage wave, i.e., the possibility of generating a voltage wave containing the basic wave at the required frequency and harmonics opposite to the harmonics produced due to nonlinear loads, which leads to an improvement of the waveform generator voltage.

Thus, this technology can be used in the future to be within the structure of the digital automatic voltage regulator, so that the voltage regulator in this case performs two functions, the first is to regulate the voltage amplitude on the output of the synchronous generator in the normal state by controlling the dc excitation current, and the second is to improve the shape of the produced voltage wave and keep it always sinusoidal even if non-linear loads containing different harmonics are connected, the digital automatic voltage regulator works to add voltages of appropriate frequencies to the primary DC wave of excitation, resulting in the generation of the 50Hz fundamental component in addition to the restoration components of the output wave distortions.