Increasing the reliability of synchronous generators based on the control of the excitation current

Abstract

Relevance: In this article, a method has been developed to increase its reliability based on controlling the excitation current of synchronous generators. The excitation circuits of the synchronous generator are powered by an alternating current source, and the excitation system includes controls and protection of the generated power. The difference between this method and other existing ones is that the reasons for the change in the excitation current of the generator are indicated using the Matlab/Simulink program.

Aim: The purpose of introducing this method into practice is to extend the period of normal operation of generators by preventing damage to the insulation of the exciting rings, power changes, accidents associated with a drop in voltage supplied to the electrical network, ensuring the continuity of the technological process, reducing the cost of technical and economic parts of the generator and providing consumers with uninterrupted electricity.

Methods: The study was conducted using a systematic approach, regression analysis methods and theoretical experimental planning. The power plant consists of several devices that operate independently of each other. Therefore, a systematic approach plays an important role in the description of complex systems. When controlling the excitation current of synchronous generators, it is more convenient to describe the function of changing electromechanical parameters over time using mathematical expectation and use the regression analysis method to find the optimal solution.

Results: The results of the study were obtained based on the parameters of a 110 MW synchronous generator operating at Navoi Thermal Power Plant JSC. Increasing the reliability and stability of power supply was achieved by controlling the excitation current of synchronous generators located at power plants, damage to the insulation of the stator and rotor of the generator, voltage drop, changes in power supplied to the network, continuity of the technological process, reducing the cost of technical and economic components of generators, uninterrupted power supply to consumers.