PMSM sensorless control strategy based on improved ADRC and high-frequency square wave injection
A control strategy and sensor technology, applied in the control system, control generator, motor control and other directions, can solve the problems of response signal delay, complex signal processing process, slow response speed, etc., to achieve the effect of simplifying the processing process
Inactive Publication Date: 2019-12-27
NANJING UNIV OF TECH
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Traditional high-frequency signal injection methods use sinusoidal signals. The signal processing process is complex, and a filter link is required to filter out high-frequency response signals. The filter will delay the response signal and narrow the system bandwidth. The traditional speed The controller adopts PI control, the response speed is slow and overshoot is easy to occur
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[0020] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:
[0021] see figure 1 , a kind of ADRC of the present embodiment and the PMSM sensorless control strategy of improving high frequency square wave signal injection, it is applied to improve the reliability of permanent magnet synchronous motor (PMSM) vector control system, mainly comprises: High frequency square wave signal injection Method 1; ADRC speed controller 2; space vector pulse width modulation (SVPWM) 3; inverter 4; permanent magnet synchronous motor (PMSM) 5.
[0022] Inject a square wave signal on the observed rotor d-axis:
[0023]
[0024] in, are the high-frequency voltage components injected under the observed d and q axes, respectively; u h is the amplitude of the injected high-frequency square wave voltage; k is the discrete sampling time.
[0025] The i of the three-phase current after coordinate transformation ab Contains fund...
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The invention discloses a PMSM sensorless control strategy based on improved ADRC and high-frequency square wave injection. The strategy comprises steps that continuous high-frequency square wave voltage signals are injected into a d axis of a vector control synchronous rotating coordinate system of a permanent magnet synchronous motor, and the frequency of the high-frequency square wave voltage signals is made to be equal to the switching frequency of an inverter; in a single high-frequency signal injection period, through two times of current sampling, the separation processing process of the fundamental current and the high-frequency response current is simplified, and no filter is needed; the fundamental current is used for performing current feedback in vector control, the high-frequency current comprises the rotor position information, the position error information is decoupled by adopting the alpha-beta axis high-frequency response signal cross multiplication method, and the rotor position is observed through a Luenberger position tracking observer; in terms of a speed controller, an improved linear active disturbance rejection controller is utilized instead of a PI controller. The method is advantaged in that the bandwidth of a sensorless control system can be improved, and higher dynamic response speed and anti-disturbance performance are achieved.
Description
technical field [0001] The invention relates to the technical field of a permanent magnet synchronous motor (PMSM) vector control system, in particular to a PMSM sensorless control strategy technology based on ADRC and high-frequency square wave injection. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of high power density, high efficiency and good dynamic performance, and has been widely used in industrial sites, electric vehicles, household appliances and other fields. In high-performance AC drive systems, sensorless control strategy has become a research hotspot in the field of motor control due to its small size, low cost, and high reliability. [0003] According to the motor control speed range, PMSM sensorless control technology can be mainly divided into two categories: medium-high speed and zero-low speed; medium-high speed control relies on the back electromotive force or flux linkage information in the three-phase voltag...
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Login to View More IPC IPC(8): H02P21/24H02P21/04H02P21/18
CPCH02P21/24H02P21/04H02P21/18H02P2207/05
Inventor 袁宇浩冯进
Owner NANJING UNIV OF TECH