An electro-hydraulic station controller retro-designed with UML capsules

An EHG (electro hydraulic governor) system, makes it possible to stabilize the frequency of an hydroelectric generating station having a low power. A first version of this system has been developed using analog electronic components. A new version based on a programmable system is under development. This paper describes an application case chosen to test a new approach that the authors have proposed, based on its conception and realization with UML capsules.