Optimization of No-Load Voltage Waveform in a Large Hydro-Generator by the Schemes which Shift the Damper Winding and Skew Stator Slots

Abstract

Improvement of no-load voltage waveform is a important problems for designing hydro-generators and ensuring operation reliability of the generators and electric network. The no-load voltage waveforms of a 335MW hydro-generator are optimized with the design scheme which shift damper winding and skew stator slots, and the computations are implemented and analyzed by the multi-slice moving electromagnetic field-circuit coupling model of the hydro-generator The results show that the waveforms of the no-load voltage are improved observably when reasonable shift damper winding and skewing stator slots. The calculation results are coincident well with the test data. The research is helpful for improving design standard and enhancing the operation reliability of the large hydro-generator and electric network.