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Doubly-fed induction motor phase-locked-loop-free power control method and device

A doubly-fed induction motor, no phase-locked loop technology, applied in motor generator control, generator control circuit, asynchronous generator control and other directions, can solve the problem of complex and cumbersome decoupling control, to simplify the calculation process, ensure no Effects of differential tracking and decoupling control

Active Publication Date: 2020-08-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art most relevant to the present invention is the patent titled "A PLL-free Current Control Method and Device for Doubly-fed Induction Generator" (Patent No.: CN201710205022.5), which proposes The SVM-DPC of SVM constructs the voltage matrix in the virtual synchronous rotating coordinate system to realize the decoupling control of active and reactive power. The disadvantage is that its decoupling control is relatively complicated and cumbersome

Method used

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  • Doubly-fed induction motor phase-locked-loop-free power control method and device
  • Doubly-fed induction motor phase-locked-loop-free power control method and device
  • Doubly-fed induction motor phase-locked-loop-free power control method and device

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Embodiment 1

[0056] A method for power control of doubly-fed induction motor without phase-locked loop

[0057] Such as figure 1 shown, including the following steps:

[0058] Step 1: Collect the instantaneous value of the stator voltage and current of the motor, and calculate the active power P and reactive power Q output by the motor stator.

[0059] Through the sensor, the stator three-phase voltage and current instantaneous value of the doubly fed induction generator (DFIG) is collected, and then the collected motor stator voltage signal is band-pass filtered through the power frequency band-pass filter. get

[0060]

[0061]

[0062] In the formula, s is the Laplacian operator, ω 1 =100πrad / s is the rated frequency, ξ is the damping ratio, u sa_mea1 , u sb_mea1 , u sc_mea1 is the instantaneous value of the three-phase stator voltage processed by the band-pass filter; u sa_mea , u sb_mea , u sc_mea Respectively represent the collected instantaneous values ​​of the three-...

Embodiment 2

[0129] Power control device for doubly-fed induction motor without phase-locked loop

[0130] include:

[0131] The sensor is installed on the stator of the motor and is used for collecting instantaneous values ​​of stator voltage and current.

[0132] A power regulator, the signal input terminal of the power regulator is connected to the power output terminal of the motor stator, and is used to adjust the active power P and reactive power Q output by the motor stator; the signal input terminal of the power regulator is connected to the motor stator power output. Can be used including but not limited to proportional (proportion) P regulator, proportional integral (proportion integral) PI regulator, proportional integral differential (proportion integral differential) PID regulator, proportional integral resonant (proportion integral resonant) PIR regulator, sliding mode regulator linear or non-linear regulators such as

[0133] A control signal calculation unit, the control...

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Abstract

The invention relates to a doubly-fed induction motor phase-locked loop-free power control method and device, and the method comprises the following steps: 1, collecting the stator voltage and currentinstantaneous values of a motor, and carrying out calculation to obtain active power P and reactive power Q outputted by a motor stator; 2, adjusting the active power P and reactive power Q output bythe motor stator, and calculating an active power feedback item vp and a reactive power feedback item vq; 3, calculating an active power excitation voltage up and a reactive power excitation voltageuq of the motor based on the active power feedback item vp and the reactive power feedback item vq; 4, based on the active power excitation voltage up and the reactive power excitation voltage uq, calculating motor rotor excitation voltages ur alpha and ur beta under a two-phase static coordinate system; 5, based on the motor rotor excitation voltages ur alpha and ur beta, calculating motor rotorexcitation voltages urr alpha and urr beta under a two-phase coordinate system rotating at the rotor electrical angular frequency, and controlling the motor rotor side converter according to the motorrotor excitation voltages urr alpha and urr beta.

Description

technical field [0001] The invention relates to a power control method and device for a double-fed induction motor without a phase-locked loop. Background technique [0002] Direct power control (DPC) has been widely used due to its advantages of no current loop, fast dynamic response and simple structure. Although the direct power control based on the look-up table method has simple structure and fast dynamic response, there are problems such as large steady-state control pulsation and unfixed switching frequency. In order to solve these problems, on the one hand, direct power control based on model predictive control (MPC-DPC) introduces an objective function, and uses the optimal objective function as the basis for selecting the effective voltage vector per cycle, and then introduces the zero voltage vector for modulation to obtain The stable switching frequency is improved, and the steady-state power ripple is reduced, but the objective function of all voltage vectors n...

Claims

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Application Information

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IPC IPC(8): H02P9/30H02P21/14H02P103/10
CPCH02P9/007H02P9/305H02P21/14H02P2103/10
Inventor 程鹏孔惠文刘祎恺贺敬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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