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Rotating speed adjustment method in asynchronous motor direct torque control system

A technology of direct torque control and adjustment method, which is applied in the field of control, can solve the problems that fast tracking performance and strong anti-disturbance ability cannot be achieved at the same time, and achieve the effect of improving fast tracking performance, starting performance and anti-disturbance ability

Inactive Publication Date: 2010-03-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0003] The invention aims at the problem that the traditional PI controller in the existing direct torque control system cannot have both fast tracking performance and strong anti-disturbance ability, and proposes a speed adjustment method in the direct torque control system of an asynchronous motor. The speed regulation loop is modified by the new IP control method, which can effectively improve the dynamic and steady-state performance of the AC motor direct torque control system

Method used

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  • Rotating speed adjustment method in asynchronous motor direct torque control system
  • Rotating speed adjustment method in asynchronous motor direct torque control system
  • Rotating speed adjustment method in asynchronous motor direct torque control system

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Embodiment Construction

[0012] Such as figure 1 As shown in the IP control closed-loop control principle diagram, the proportional control link in the traditional PI controller is moved from the forward channel to the feedback channel, and a new type of IP controller is formed through structural changes.

[0013] The closed-loop transfer function of the IP control system is: G b(s) =k I G p(s) / [k I G p(s) +(1+k p G p(s) )s] In the above formula: G p(s) , G b(s) Represent the transfer function of the controlled object and the transfer function of the closed loop; k p is the proportional gain, k I Integral gain, there is no zero point in the closed-loop transfer function of the IP control system. Since the proportional link is moved to the feedback channel, the IP control first plays an integral role and then a proportional role, and the overshoot will be reduced or even disappeared.

[0014] figure 2 It is the structure diagram of IP controller. The IP structure is used in the figure, 1 ...

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Abstract

The invention relates to a rotating speed adjustment method in an asynchronous motor direct torque control system. By modifying the traditional PI speed regulator in the direct torque control system,a new speed adjustment IP control method is obtained, so that the speed response time quickened, overshoot is reduced or even eliminated and the anti-interference property of the system is also enhanced, thus further improving the rapidness, accuracy and robustness of the asynchronous motor direct torque control system in the control of rotating speed.

Description

technical field [0001] The invention relates to a control method, in particular to a speed regulation method in a direct torque control system of an asynchronous motor. Background technique [0002] At present, direct torque control has the characteristics of novel control idea, simple structure, direct means, clear physical concept, and quick response. It is an AC speed control method with high static and dynamic performance, so it is being adopted by AC speed control systems. However, the speed regulator in the direct torque control system generally adopts the traditional PI controller. Although it has good dynamic and static performance, the PI control still has defects that are often ignored by people, such as the speed when the speed is given a step change. If the overshoot is too large, especially in the occasions where frequent starting and braking are required, too much speed overshoot will seriously affect the control effect and even damage the mechanical equipment;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/02H02P23/00
Inventor 梅菁刘海华梅柏杉陈晖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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