Study of a 1000 MW Turbine Control by Means of a New Short- and Long-Term Stability Program (STAG)

Abstract The improvement to the performance of turbine control systems of large-sized PWR units has been studied. The simulation and analysis tool is briefly described : it is a new computer program known as “STAG” intended for the study of the dynamic behaviour of electrical power systems. This program is distinguished by its use of a continuously variable integration step which allows it to calculate with an equal accuracy both the fast electro-mechanical phenomena and the slow thermal phenomena encountered on generating units. It also has a simulation macro-language at its disposal which provides facilities for the easy representation of new process and controllers models. Improvements to the operating performance of turbine control system is sought through a fundamental modification to the governor's design. This is highlighted by the simulation of the sets' behaviour under network short-circuit conditions, taking into account the interactions with other sets nearby.