High frequency injection sensor-less motor control method with cascade of SOGI and SFNF
In order to solve the problem of phase deviation and position estimation error caused by the simultaneous application of band-pass filter and low-pass filter in traditional high frequency pulsating volt-age injection,an improved strategy of cascaded second order generalized integrator(SOGI)and single frequency notch filter(SFNF)was proposed for accurate and real-time extraction of position error sig-nals.The amplitude-frequency characteristics of the position observation closed-loop transfer function were studied.The frequency selection characteristic of SOGI was used to extract the high-frequency cross-axis response current,and the second harmonic of the injected signal was filtered by the notch wave prop-erty of SFNF,which replaces the bandpass filter and low pass filter.It has the advantages of both filtering accuracy and bandwidth.An experimental platform was built to compare the traditional error signal ex-traction strategy with the proposed strategy.The experimental results show that the speed estimation error is reduced by 5.9 r/min and the position error is reduced by 0.11 rad under speed step condition.The speed estimation error is reduced by 3 r/min and the position error is reduced by 0.08 rad when load is suddenly applied,and the response time is shortened by 42%,which effectively improves the position observation accuracy and the dynamic response performance of the system.
high frequency injectionbrushless DC motorsensor-less controlvector controlsecond-or-der generalized integratornotch filter
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