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Vector control device for induction motor

A technology of induction motor and vector control, applied in motor generator control, electronic commutation motor control, vector control system and other directions, can solve the problems of large rotation speed observation error, system instability, and inability to guarantee algorithm stability.

Inactive Publication Date: 2010-12-29
哈尔滨同为电气股份有限公司 +1
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a vector control device for induction motors to solve the problem that the traditional induction motor vector control method cannot guarantee the stability of the algorithm due to the speed adaptive rate, and the system is unstable under low-speed power generation status and the speed is observed at low speeds. big error problem

Method used

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  • Vector control device for induction motor
  • Vector control device for induction motor
  • Vector control device for induction motor

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specific Embodiment approach 1

[0012] Specific implementation mode one: the following combination Figure 1 to Figure 3 This embodiment will be specifically described. This embodiment includes a current sensor 105, a converter 103, a first coordinate transformation unit 102, a second coordinate transformation unit 110, a three-phase to two-phase coordinate transformation unit 107, a voltage reconstruction unit 109, a first current control unit 101, a second Two current control unit 106, speed control unit 100, flux linkage control unit 122, full-order observer unit 108 and rotational speed adaptive observation unit 111,

[0013] After the stator current A of the induction motor 104 is sampled by the current sensor 105, it is sent to the three-phase to two-phase coordinate transformation unit 107 for coordinate transformation of the α-β stationary coordinate axis system. The second coordinate transformation unit 110 is based on the full-order observer unit 108 The observed angle of the observed value C of t...

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Abstract

The invention discloses a vector control device for an induction motor and relates to a vector control device without speed sensor for the induction motor. The invention solves the problem of the vector control method of the conventional induction motor that a system is unstable in a low-speed power generation state and has a bigger rotating speed observation error under a low-speed condition because a rotating speed adaptive rate cannot guarantee the stability of an algorithm. In the invention, the speed of the motor can be observed by adding the exciting current error between the actual value and observed value of an exciting current and the product of a q axis stator magnetic chain observed value and a variable gain (M) into the general product of the observed current bias and the observed rotor magnetic chain and through a PI regulator; and thus, the speed of the motor can be controlled. The device reduces the low-speed performance of the system considerably and solves the unstable problem of the system in a power regeneration state effectively. The device is used for controlling the rotating speed of the induction motor.

Description

technical field [0001] The invention relates to a control device of an induction motor, in particular to a speed sensorless vector control device of the induction motor. Background technique [0002] At present, the commonly used AC speed control methods include V / F control, vector control and direct torque control (DTC). Vector control is considered to be the most widely used control method for high-performance control of induction motors. The vector control based on rotor field orientation can realize the decoupling control of induction motors. This method can make the dynamic performance of induction motors comparable to that of DC motors. comparable to. In a vector control system, a speed sensor is usually required to decouple the motor for flux orientation. However, the installation of the speed sensor increases the cost and complexity of the entire system, and under severe conditions such as high temperature and humidity, the installation of the speed sensor reduces ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/04
Inventor 陈伟杨荣峰于泳王高林徐殿国杨明贵献国
Owner 哈尔滨同为电气股份有限公司
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