Modeling of deadband function of governor model and its effect on frequency Response characteristics

Frequency Response has been the focus of increased attention and analysis recently due to its importance to the reliability of the network. The models used by the utilities proved to be insufficient and the inability to duplicate events using the existing models and databases has led to several initiatives to address these shortfalls. In this work, the effect of the dead-band in the governor/turbine model is investigated. For this purpose, IEEEG1 model is used to study the frequency response of the steam generators. Many of the existing industrial software used by the utilities ignore the dead-band function in their governor model. Using the incorrect parameters for the dead-band function can lead to the significantly incorrect frequency response, it is even worth in case of ignoring the dead-band function. In this paper, the effect of the dead-band setting on the frequency response is studied. The response of the generator during the frequency deviation is analyzed both with and without the dead-band. ETAP is used as a good candidate for an industrial software to study the effect of the frequency deviation on the generator response. Ignoring the dead-band is shown to depict a very optimistic picture of the frequency response.