Start-up and synchronization of a variable speed pump-turbine unit in pumping mode

Variable-Speed Operation of Hydropower Plants: A Look at the Past, Present, and Future

“…• The DfIM startup procedure can be difficult [33], [49], [50]; because of the limited starting torque, a time-consuming and costly dewatering procedure may be necessary.…”

Optimization of the start-up time of a variable speed pump-turbine unit in pumping mode

“…Boldea [9] for generating and pumping operation at the power grid. The theoretical aspects related to the start-up and synchronization procedures for such large pump-turbine units have been presented in details [20]. The aim of this paper is to present the aspects related to the optimization of the start-up procedure in order to guarantee the different operation modes within a reasonable time and by using the only existing equipment used in normal operating modes (speed sensor and without use of any autotransformer connected to the rotor).…”

“…Note that set rq i _ can be chosen by modifying the limit values of the speed regulator output, as this one is equal to its maximal value during all the start-up procedure. The three steps related to the start-up procedure are summarized in TABLE III [20].…”

Speed Control in Electromagnetic Synchronization System with Two Single Phase Induction Motors by Rotor Flux Regulation

“…Solutions for load distribution in multi elimination, are described. Authors in [12] described the speed synchronization of a DC multi motor system, while the DC motors, in the recent years, are rarely used because of their disadvantages compared to the in systems using three-phase induction motors [1], [11], [14], [15].…”