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Abstract

This paper describes the practical experiences about the no-load dynamic performance test, parameter identification, and tuning of static excitation systems (SESs) of the synchronous generators in the Tong-Shiao Generation Station of the Taiwan Power System. The dynamic stability of under-load generators has also been improved. The hardware circuits of SESs had been modified. This caused the detuning of parameter values, so that the generators did not have enough ability to sustain voltage fluctuation disturbances. Several SESs had been preliminarily retuned according to the results from simple field tests. However, step signal responses in field tests revealed that the characteristics of some units were different from the computer simulation results. Before retuning them again, it needed to identify the parameters of SESs. The least-squared-error algorithm has been employed to estimate the parameters of inner-loop regulators in SESs. Then SESs have been retuned again to have good dynamic performance indices. Eigenvalue analysis and time domain simulation were used to examine the dynamic stability conditions of underload generators. The experiences and results in this paper provide useful references about performance improvement of generators.

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