Asynchronous oscillation suppression method of separately controlled doubly fed electric machine and doubly fed electric machine system of asynchronous oscillation suppression method

A doubly-fed motor and controller technology, applied in the control system, motor parameter estimation/correction, slip frequency control, etc., can solve problems such as unstable characteristics and limit the industrial application of the control system, and solve the problem of easy out-of-step , improve stability, improve the effect of rapid response

Active Publication Date: 2015-12-30
SHENZHEN INVT ELECTRIC
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Problems solved by technology

However, similar to the separately controlled control mode of permanent magnet synchronous motor without damping winding (starting winding), the separately controlled doubly-fed speed control system using voltage source inverter has inherent instability characteristics. , f

Method used

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  • Asynchronous oscillation suppression method of separately controlled doubly fed electric machine and doubly fed electric machine system of asynchronous oscillation suppression method
  • Asynchronous oscillation suppression method of separately controlled doubly fed electric machine and doubly fed electric machine system of asynchronous oscillation suppression method
  • Asynchronous oscillation suppression method of separately controlled doubly fed electric machine and doubly fed electric machine system of asynchronous oscillation suppression method

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Embodiment Construction

[0014] In the embodiment of the present invention, a method for suppressing out-of-step oscillation of a separately controlled doubly-fed motor and a doubly-fed motor system using the method are provided.

[0015] In some embodiments of the present invention, the schematic diagram of the separately controlled doubly-fed motor system can be as figure 1 Shown. In these embodiments, the doubly-fed motor system may include a doubly-fed motor 1, a frequency converter 2, and a controller 3. A frequency converter 2 (for example, a four-quadrant frequency converter) is connected to the doubly-fed motor 1. The controller 3 is connected to the inverter 2 and controls the operation of the doubly-fed motor 1 through the inverter 2 based on the received control signal.

[0016] although figure 1 It is displayed in a way that the controller 3 and the inverter 2 are separated, but it should be understood figure 1 It is only a schematic structural diagram for the convenience of description, and i...

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Abstract

The embodiment of the invention discloses an asynchronous oscillation suppression method of an separately controlled doubly fed electric machine and a doubly fed electric machine system of the asynchronous oscillation suppression method. The method comprises the steps that active power of a rotor of the electric machine is calculated; an oscillating component of the active power is extracted from the active power; a slip frequency compensation quantity is calculated according to the oscillating component; slip frequency of the electric machine is compensated through the slip frequency compensation quantity. According to the asynchronous oscillation suppression method of the separately controlled doubly fed electric machine and the doubly fed electric machine system of the asynchronous oscillation suppression method, the slip frequency compensation quantity of the electric machine is calculated according to the oscillating component of the active power of the rotor and used for conducting compensation on the slip frequency, system damping is increased, stability of the system and rapidity of a response are improved, and the inherent unstable problems such as out-of-step which is prone to occurrence and overcurrent of a separately controlled doubly fed speed regulating system are solved.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a method for suppressing out-of-step oscillation of a separately controlled double-fed motor and its double-fed motor system. Background technique [0002] In the traditional speed control system of the wound rotor motor, most of the rotor series resistance speed control and the traditional cascade speed control system are adopted. The rotor string resistance speed control method is all wasted on the resistance due to the slip energy, and the system efficiency is low, and it has been gradually eliminated. This speed control method is almost no longer used in the new system, but it is still widely used. The old system of the speed regulation mode needs to be technically transformed and upgraded. The traditional wound rotor motor cascade speed regulation system realizes the subsynchronous speed regulation of the motor, but this system has the problem of inverter subversion, and t...

Claims

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Application Information

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IPC IPC(8): H02P23/08H02P23/14H02P27/04
Inventor 王二峰曾川
Owner SHENZHEN INVT ELECTRIC
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