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Owing to the part-load operations for the enhancement of grid flexibility, the Francis turbine often suffers from severe low-frequency and large-amplitude hydraulic instability, which is mostly pertinent to the highly unsteady swirling vortex rope in the draft tube. The influence of disturbances in the upstream (e.g., large-scale vortex structures in the spiral casing) on the draft-tube vortex flow...
Squirrel-cage induction motors are replacing DC motors in variable speed applications due to the availability of advanced control techniques such as Direct Torque Control and Field Oriented Control. At part-load operation of an induction machine, the core losses and, to some extent, copper losses can be minimized, if the machine is operated at a reduced value of flux rather than at the rated value...
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