A sliding mode control strategy for permanent magnet motor
A permanent magnet motor and sliding mode technology, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problem of affecting the dynamic response speed of double closed-loop control, not being able to suppress load disturbance well, and affecting system control Accuracy and other issues to achieve the effect of improving anti-disturbance performance, reducing fluctuations, and fast convergence speed
Active Publication Date: 2016-06-08
TIANJIN UNIV
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[0004] In addition, in the traditional control system, the rotational speed is obtained by the differential of the discrete rotor position output by the encoder, which will bring noise and discrete errors, and affect the dynamic response speed of the system's double closed-loop control
The disturbance of the load torque will also affect the control accuracy of the system. In the closed-loop control of the permanent magnet synchronous motor, it is assumed that the load torque disturbance is zero or a fixed value. When the load changes suddenly, the controller cannot suppress it well. Load disturbance, resulting in a large change in the motor speed
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] figure 1 It is the block diagram of the permanent magnet synchronous motor speed and current double closed-loop control system.
[0027] Composed of permanent magnet synchronous motor, three-phase inverter, SVPWM space vector modulation, position sensor, sliding mode speed controller, current PI regulator, two-phase stationary / two-phase rotating coordinate transformation (αβ / dq), three-phase stationary / Two-phase stationary coordinate transformation (abc / αβ), two-phase rotational / two-phase stationary coordinate transformation (dq / αβ) and extended sliding mode observer. Among them, the motor stator three-phase current i a i b i c It is measured by the current sensor, and then obtained through three-phase / two-phase stationary, two-phase stationary / two-phase rotating coordinate transformation to obtain i d and i q ; The position sensor is inst...
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The invention belongs to the technical field of permanent magnet motors, and relates to a sliding mode control strategy for permanent magnet motors. The permanent magnet motor adopts double-closed speed and current control, and is characterized in that the control strategy adopts a sliding mode speed controller and An extended sliding mode observer, the sliding mode speed controller adopts the exponential reaching law containing the speed error and the sliding mode surface information, takes the deviation of the given speed and the feedback speed as the input quantity, and outputs the controlled quantity through the sliding mode q-axis current given value; the extended sliding mode observer estimates the rotor position, speed and load torque in real time, the speed and rotor position provide information for speed closed-loop control and coordinate transformation, and the load torque is compensated to the sliding mode speed controller , to achieve high-precision vector control of permanent magnet motors. The control strategy of the invention enables the system to quickly track a given speed in dynamic state, reduces speed overshoot and current fluctuation, and improves the anti-disturbance performance of the system.
Description
technical field [0001] The invention belongs to the technical field of permanent magnet motors, and relates to a motor sliding mode control strategy. Background technique [0002] Since the permanent magnet synchronous motor is a multivariable, strongly coupled nonlinear system, the performance of traditional linear control such as PI control is easily affected by system uncertainty and external disturbance, which will reduce the reliability of system operation and dynamic and static performance. Sliding mode variable structure control has the advantages of strong robustness to uncertain disturbances and fast dynamic response. It can still obtain good tracking performance under external disturbances and parameter changes, and has a fast dynamic response speed. It has been successfully applied to permanent magnet synchronous motor AC servo system. [0003] Due to the discontinuous switch control in the sliding mode control, chattering becomes an inherent characteristic of th...
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IPC IPC(8): H02P21/05H02P21/18H02P21/20
Inventor 夏长亮史婷娜马银银
Owner TIANJIN UNIV