Abstract: According to the 90 s regular breaking and 15 s emergency breaking requirement for 60 MW axial

compressor used in some large scientific facility，a control strategy of electric hybrid breaking in the convertor was

designed. The hybrid braking control strategy was analyzed and calculated，and the optimal braking control process

for the compressor and the parameters of the braking resistance were determined. The control strategy and breaking time were verified by real-time digital simulator（RTDS）simulation and experiment. The simulation result and experiment result show that simulation result is closed to experiment result，and the hybrid breaking control strategy of convertor is safe and reliable. The real regular breaking time is 87.54 s and the real emergency breaking time is 14.82 s. The regular breaking time and the emergency breaking time fulfil the technical performance.

      Key words: axis compressor；convertor；hybrid breaking；control strategy；breaking resistance