On-Line Hydrogenerator Power Angle and Synchronous Reactances Determination Based on Air Gap Measurement

Abstract

This paper presents a method for the power angle determination of the salient-pole synchronous machine from the terminal voltage and air gap measurement. The method is developed as a part of a monitoring system that is installed on the 26 MVA generator of the Peruca hydroelectric power plant in Croatia. The raw signal of the air gap sensor is used to detect the rotor displacement referenced to the fundamental component of the terminal voltage. The method is proved by comparing it to another measurement of the generator power angle based on a tooth gear mounted on the rotor shaft. In addition, the on-line determination of the synchronous reactances in the q- and d-axis was performed and saturation effects were also considered.

Marin Despalatović

Full Professor | Department of Electrical Drives and Industrial Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he teaches courses Electric Machines, Electric Drive Systems, and Electromechanical System Modeling. His research focuses on power systems, energy storage, and smart grid technologies, with active participation in multiple national and international projects aimed at advancing energy infrastructure and improving system stability.

Božo Terzić

Full Professor | Department of Electrical Drives and Industrial Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with significant contributions in the field of industrial development projects including the design of prototypes of electronic converters used in industrial plants around the world. His research interests are focused on the application of electronic converters in electric drives and renewable energy sources.