AC adjustable speed drive（ASD）is susceptible to the production interruption due to voltagedip. For obtaining voltage dip immunity feature of ASD

in this paper

the simulation model of ASD is setup firstly by the Matlab/Simulink. Then

with reference to the standard specification

the simulation testflow of ASD is designed and the simulation test is performed from the operation status of motor and voltage dipcharacteristics. After that

the simulation test result is analyzed so to obtain voltage dip immunity of ASD at dif-ferent dip type

load rate and voltage dip initial angle and corresponding voltage tolerance curve is plotted. Fi-nally

the influence of converter on voltage dip immunity characteristic is analyzed and the technical mea-sures on improving voltage dip immunity of ASD are obtained. The voltage dip immunity of ASD is testedby large number of simulation

which can be able to reduce the test cost and improve the test efficiency.