| In recent years,the problems of environmental pollution and energy shortage in China have become increasingly prominent.As the main driving unit in the industrial field,the optimization and improvement of its driving control has become an irresistible trend.Among them,the Interior permanent magnet synchronous motor(IPMSM)has been widely used in industry,aerospace,transportation,household appliances and other industries due to its advantages of high efficiency,high power density,and easy to weaken the magnetic field.Then,high-precision motor control technology often requires accurate position information.Traditional mechanical sensors are prone to failure under different equipment and different working conditions,which seriously affects the reliability of the drive system.Sensorless technology can increase system reliability while also lowering system costs as a form of location fault tolerance.Therefore,it is of great significance to develop a high-performance,high-precision and robust sensorless permanent magnet synchronous motor drive control system.The research contents of this paper include:(1)The operation principle of the mathematical model of the IPMSM motor is analyzed,and the IPMSM vector control model is established.The high-frequency rotation injection method involves injecting a rotating high-frequency voltage vector into the stationary phase(αβ)coordinate system,and the position information can be hidden in the phase of the induced high-frequency current.Main advantage: Due to the symmetrical sinusoidal voltage injected,it has potential stability.Disadvantages:Inevitably,it will bring about current fluctuations and torque pulsation,which will have adverse effects on control performance.In addition,to ensure the sinusoidal nature of the injected signal,the injection frequency is limited.The high-frequency pulse voltage signal injection method is to inject the pulsating voltage signal into the estimated rotating two-phase(dq)coordinate system,and the amplitude of the induced highfrequency current includes the position signal.Main advantage: Due to the injection of the d-axis,there is little current and torque ripple,and the signal processing process is relatively simple.Disadvantage: In order to ensure the sine curve of the injection voltage,the injection frequency signal is limited,which is not conducive to improving dynamic performance.(2)Aiming at the problems of insufficient response ability and poor antidisturbance ability of the current loop,a decoupled linear active disturbance rejection controller is proposed.By separating the tracking response performance and antidisturbance performance of the traditional linear active disturbance rejection controller,the parameters are simplified.Tuning widens the bandwidth of the current loop and improves the stability of the current loop.By comparing the simulation with traditional Linear Active Disturbances Rejection Controller(LADRC)and Proportional Integral Controller(PI)under variable load conditions,it is verified that the proposed algorithm has faster response performance and stronger anti-disturbance performance.(3)Aiming at the shortcomings of the filtering accuracy and dynamic performance of the traditional current demodulation algorithm of the high-frequency rotation injection method,an improved current demodulation algorithm based on the adaptive position closed-loop demodulation algorithm is proposed,and the dual-frequency adaptive notch filter is used to filter the demodulation algorithm Harmonic signals in the algorithm.The algorithm significantly increases the bandwidth of the demodulation algorithm by utilizing the closed-loop characteristics of the demodulation algorithm.The decoupled linear active disturbance rejection controller was introduced in the experiment to optimize the current loop,and finally the high-precision and robust performance of the proposed improved high-frequency rotation injection sensorless drive control system was verified. |
