User P-Q Diagram as a Part of a Synchronous Generator Monitoring System

Abstract

This paper describes the implementation of the P-Q capability diagram into the existing monitoring system for the 247 MVA synchronous turbo generator installed in a thermal power plant. The paper also addresses features, characteristics and uniqueness of the existing monitoring system as well as the modeling considerations required for the development of a P-Q diagram. This enables better insight into the operational limits which ensures better utilization of the synchronous generator. The proposed approach and methodology can be used for the implementation of the user real-time P-Q diagram whose limits change dynamically in accordance with operating conditions when the generator operates on the grid.

Condition-Monitoring System for Identification and Representation of the Capability Diagram Limits for Multiple Synchronous Generators in a Hydro Power-Plant

“…It is known that the the synchrous reactances are changing with the operating point of the generator which has been reported in literature [6][7][8]22,[41][42][43][44][45][46][47][48][49].…”

“…A smaller number of papers deal with the steady-state models of the synchronous machines [45][46][47][48][50][51][52][53][54]. An interesting approach is presented in [6][7][8] where the dynamical model of the synchronous generator is identified based on the measurement of the steady-state operating points during on-grid operation.…”

“…Due to the magnetic saturation, cross-magnetisation effect, and variation of the armature voltage, the operational limits will be changing in real-time. The variable capability diagram limits are analysed in [45][46][47][48][55][56][57].…”

“…Condition-monitoring systems for synchronous generators are reported in [48,[59][60][61]. However, none of the described condition-monitoring systems deals with the logging data for identification of the P-Q diagram capability limits for multiple hydro generators in power plants.…”