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VOLTAGE AND FREQUENCY CONTROL OF A STAND-ALONE SYNCHRONOUS GENERATOR USING PLC
(2021-07-12) Elhawat, Masoud Mohamed Masoud
In hydroelectric and thermal type power plants, mechanical energy is converted into electrical energy using synchronous generators. One of the most important issues for both the large and medium sized synchronous generators in such power plants, and the smaller synchronous generators found in diesel or gasoline powered generator sets is to keep the frequency and voltage constant according to the changing load because it is very important to keep the voltage and frequency constant for stabilization of the grid. In this thesis, an automatic speed and voltage control of a 1 kW standalone synchronous generator was aimed to be conducted in accordance with the changing load conditions and therefore, an experimental setup was prepared. The experimental setup consists of a synchronous generator, an asynchronous (induction) motor, a frequency converter driving this asynchronous motor, load groups and other equipment necessary for the control of the system. The system is controlled using PLC (Programmable Logic Controller) and it is possible to control and monitor the system through a designed SCADA screen. PID and PI controller methods were performed individually for frequency and voltage control in different load conditions and the results obtained from these two methods were compared with each other accordingly.