Control Relevant Model of Synchronous Generator Attached to Turbine and Grid
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A synchronous generator is one of the important units in the hydropower plant that plays a key role in the production of electricity. Much effort has been done for designing more accurate models of synchronous machines over the years. Here, a possible extension of the existing description of the synchronous generator model presented in Lie (2019) was carried out. First, a complete mathematical model of a synchronous generator is presented, and thereafter the model is connected to the waterway system including turbine and grid. Different behavior of the models was observed through simulation by using the open-source program OpenModelica. The dq0 and phase space model of a synchronous generator was compared and the dq0 model was found to be stable than phase space. When large mechanical power was applied, synchronism was lost, and it was discovered that field voltage could be increased to regain synchronism. The frictional loss was also introduced to the model, and the results were found to be as expected.