Frequency Difference To Control Energy-saving Ac Variable Speed System,

A new model of variable frequency experiment system, which adoptsAc asynchronous motor as analogue load, is presented in this thesis.Based on the qualitative and quantitative analysis of system principle, acontrol method that is frequency difference control is derived. Theprocess of energy flowing and the principle of saving energy areanalyzed, and also the rate of saving energy is calculated, compared to thetraditional experiment system. Applied the simulation software MATLAB,first the single motor's model is composed, then the two motors' modelare formed to prove the feasibility and validity of frequency differencecontrol. The constant torque load and the square load are also simulated.Finally abundant data and waveform of motor characteristic and manykinds of loads are obtained, indicating that frequency difference control isflexible and effective, and system has good property of saving energy.