A phase-locked loop-free current control method and device for a doubly-fed induction generator

A doubly-fed induction and current control technology, applied in the direction of motor generator control, asynchronous generator control, electromechanical transmission control, etc., can solve problems such as instability, converter output negative impedance, oscillation, etc., to achieve simplified design and Implement processes to enhance the effectiveness of adaptability

Active Publication Date: 2021-09-03
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

However, current studies have proved that the phase-locked loop will lead to the negative impedance of the output of the converter, and the interaction with the positive impedance of the power grid will cause oscillation, and in severe cases, it will even cause instability.

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  • A phase-locked loop-free current control method and device for a doubly-fed induction generator
  • A phase-locked loop-free current control method and device for a doubly-fed induction generator
  • A phase-locked loop-free current control method and device for a doubly-fed induction generator

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0062] The present invention is a phase-locked loop-free current control method of a doubly-fed induction generator, said method comprising the following steps:

[0063] Step 1: Collect the parameters of the double-fed induction generator, and perform coordinate transformation on the parameters to obtain the stator voltage vector U in the two-phase stationary α-β coordinate system sαβ and the stator current vector I sαβ ;

[0064] Step 2: For the stator voltage vector U sαβ and the stator current vector I sαβ Carry out coordinate transformation to obtain the stator voltage vector U in the virtual synchronous rotating coordinate system sdq and the stator current vector I sdq ;

[0065] Step 3: According to the stator voltage vector U sdq , Doubly-fed induction generator active power P s and output reactive power Q s , to calculate the stator current vector I o...

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Abstract

The invention provides a phase-locked-loop-free current control method and device of a doubly-fed induction generator. The method includes: collecting the parameters of the doubly-fed induction generator and performing coordinate transformation to obtain the stator voltage vector U sαβ and the stator current vector I sαβ ;For the stator voltage vector U sαβ and the stator current vector I sαβ Carry out coordinate transformation to get the stator voltage vector U sdq and the stator current vector I sdq ; Calculate the stator current vector I of the doubly-fed induction generator sdq d, q axis command; calculate the rotor voltage command U in the virtual synchronous rotating coordinate system rdq ;To the rotor voltage command U rdq Carry out coordinate transformation to obtain the rotor voltage command U in the two-phase static α-β coordinate system rαβ , and then generate a set of PWM signals to control the rotor converter of the doubly-fed induction generator. The technical scheme provided by the invention simplifies the design and implementation process of the control system, and enhances the adaptability of the control system to generator parameter changes.

Description

technical field [0001] The invention relates to the field of doubly-fed induction wind power generator control, in particular to a phase-locked-loop-free current control method and device for a doubly-fed induction generator. Background technique [0002] With the widespread installation and application of doubly-fed wind turbines in wind farms, doubly-fed induction generators are the core unit of the entire power generation unit, and their operation and control technology has been focused on research. At present, there are two main control schemes for doubly-fed induction generators: vector control and direct power control. [0003] Vector control is generally implemented in a synchronous rotating coordinate system. The rotor current is used as the controlled object to construct a corresponding control closed loop. By adjusting the excitation component and torque component of the rotor current, the output of active power, Control of reactive current. Among them, the rotor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/14H02P21/22H02P101/15
CPCH02P9/14H02P2101/15H02P2103/10H02P21/22
Inventor 程鹏李庆张金平
Owner CHINA ELECTRIC POWER RES INST
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