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Asynchronous motor pure electronic speed feedback method

An asynchronous motor, speed feedback technology, applied in the control of generators, motor-generator control, electronic commutation motor control and other directions, can solve the problem that the dynamic performance of the transmission system cannot be guaranteed, the vector control cannot be guaranteed, the large amount of calculation is not conducive to online implementation, etc. question

Inactive Publication Date: 2014-08-20
XIAN UNIV OF TECH
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Problems solved by technology

However, since this type of method is essentially an open-loop observation method, there is no error correction link, and the shortcomings are also very obvious
The existing problems are as follows: 1) The dynamic performance of the entire transmission system cannot be guaranteed because the vector control in the dynamic process can not be guaranteed; The impact of disturbance is large; 3) For the method based on the rotor back electromotive force, the value of the back electromotive force at low speed is very small, resulting in a large error in the calculated speed
The disadvantage of the EKF speed estimation method is that the large amount of calculation is not conducive to online implementation

Method used

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  • Asynchronous motor pure electronic speed feedback method
  • Asynchronous motor pure electronic speed feedback method
  • Asynchronous motor pure electronic speed feedback method

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Embodiment Construction

[0082] figure 1 It is a block diagram of an existing conventional system realizing a direct vector control device without a speed sensor of an asynchronous motor, wherein the entire vector control algorithm 120 including the EKF rotational speed estimation algorithm 90 is all implemented using DSP programming, that is, the entire vector control algorithm 120 in the figure needs Occupies the storage space resources and runtime resources of the DSP. This conventional asynchronous motor direct vector control device using EKF for speed estimation and speed feedback includes closed-loop control of speed, torque current and rotor flux excitation current. The speed PI regulator 30 according to the speed instruction and speed feedback value The deviation between provides the torque reference value, in the case of constant rotor flux, the torque is proportional to the stator current torque component, therefore, the output of the speed regulator 30 is based on the torque current ref...

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Abstract

The invention provides a pure electronic speed feedback method for an asynchronous motor. The specific operation steps are as follows: first obtain the discrete-time form expression of the mathematical model of the asynchronous motor, and then obtain the reduced-order EKF speed estimation algorithm for the asynchronous motor according to the extended Kalman filter algorithm, and then Design the algorithm structure of FPGA to realize the reduced-order EKF speed estimation. Based on the algorithm structure described above, the FPGA is described in hardware language VHDL, and the state estimated values ​​iαs, iβs, Ψαr, Ψβr, ωr are sent to the parallel port and sent back to the main control DSP. The present invention greatly reduces the pressure on the real-time calculation amount of the main control DSP, leaving more storage space and calculation space for speed and current control; and the EKF speed estimation algorithm implemented in parallel by FPGA can be implemented within 1 μs level Complete, so that the speed estimation algorithm can choose a smaller sampling period, so the speed estimation accuracy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of industrial transmission, and relates to a pure electronic speed feedback method, in particular to a method for realizing online estimation of the speed of an asynchronous motor by using a pure hardware circuit. Background technique [0002] In high-performance speed control of asynchronous motors, speed feedback signals are needed for speed closed-loop control in order to obtain fast dynamic response and high steady-state accuracy. [0003] In recent years, the rapid development of power electronics and computer technology has provided the necessary conditions for the realization of high-performance AC speed control systems. Due to the installation of speed and flux sensors, the price of the transmission system is increased, the reliability of the system is reduced, and the inherent firmness and simplicity of the asynchronous motor are destroyed. Therefore, speed sensorless control has not only become an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/18
Inventor 李洁
Owner XIAN UNIV OF TECH
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