Synchronous Generator Load Angle Measurement and Estimation

The article is focused on a load angle measurement and estimation in excitation control systems of synchro-nous generator. Load angle is measured by digital encoder. The estimation method is based on synchronous gene-rator parameters given by the corresponding voltage-current vector diagram. The estimation results were compared with the measured ones. The estimation method gives satisfactory accuracy for load angles less then 120°°el. Load angle control in excitation systems improves the stability of a synchronous generator in capacitive operating mode. Key words: digital control system, excitation system, load angle estimation, synchronous generator