Abstract: The air conditioner has higher requirements for the speed of compressor.Flux weaking control is an important strategy to improve the running speed of compressor.On the basis of FOC vector control adopted by the compressor,analy the control model of the compressor, the negative i_d compensation is obtained by analyzing the control model of the compressor.Then the flux weaking control model of negative i_d compensation method is established. The model adjusts the output voltage and the target voltage to obtain the flux weak compensation, and adds a low pass filter module and an anti disturbance clamping module in the flux weak control loop to reduce the disturbance of flux weak output in the steady state and improve the control stability. Finally, the algorithm is applied to variable-frequency air conditioning, and the experimental results show that the negative i_d compensation flux weak scheme can improve the compressor speed, and the flux weak compensation is not disturbed in the steady state.

Key words: Frequency converter air conditioner, Compressor, Flux-weak, Negative i_d compensation method