Synchronous and Asynchronous Generators Frequency and Harmonics Behavior after a Sudden Load Rejection

ABB Automation Products Sweden
IEEE Power Engineering Review 09/2002; 22(8):65-65. DOI: 10.1109/MPER.2002.4312495
Source: IEEE Xplore


This paper describes load rejection tests done at two hydro power plants in Sweden, one equipped with synchronous and the other with asynchronous generators. During the tests, voltages and currents are digitized, recorded, and thereafter offline processed. By this, in the processing of distorted and fast parameter-varying voltages and currents, the powerful estimation technique, the Newton type algorithm, is applied. It was intended to investigate the frequency changes and the distortions of the measured signals. The transient processes at both generators are compared. In particular, the frequency changes after the instance of load rejection are investigated and discussed from the signal processing and physical nature point of view.

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    • "Due to its active role within the system -being used to supply electric power and to modify the voltage and the circulation of active and reactive power – the synchronous generator shows a capital significance for designers and engineers involved in solving system problems. Beginning from the Park's equations, the non-liner model of a synchronous generator connected to an infinite bus through a long transmission line (figure 1) is described by the next ten equations depicted as follows [4] [8] "

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