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Constant-voltage-control-based method for identifying mutual inductance parameters of doubly-fed wind power generator

A wind turbine, constant voltage control technology, applied in the control of generators, wind energy power generation, motor generator control, etc., can solve problems such as complicated calculation methods, and achieve the effect of reducing complexity

Active Publication Date: 2019-03-26
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the exact solution is obtained by solving a matrix integral equation, which is cumbersome to calculate.

Method used

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  • Constant-voltage-control-based method for identifying mutual inductance parameters of doubly-fed wind power generator
  • Constant-voltage-control-based method for identifying mutual inductance parameters of doubly-fed wind power generator
  • Constant-voltage-control-based method for identifying mutual inductance parameters of doubly-fed wind power generator

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Embodiment 1

[0044] Example 1: figure 2In the control block diagram shown, the number of pole pairs of the doubly-fed wind generator=3, the grid-connected voltage=100V (line voltage), and the grid-connected power=300W. The filter excitation structure is adopted, the excitation DC voltage is 50V, the power grid is controlled and simulated by IPM (intelligent power control module), the three-phase asynchronous motor is used as the prime mover, and the rotor vector angle is obtained by the rotary encoder.

[0045] image 3 During the mutual inductance parameter identification control period, the voltage waveform and the mutual inductance parameter identification curve when the initial value of the mutual inductance is 100mH. The stator voltage control is the same as the mutual inductance parameter identification time, which is completed within about 65ms. And when the stator voltage phase is ahead of the grid voltage, the stator voltage waveform and the parameter identification curve chang...

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Abstract

The invention discloses a constant-voltage-control-based method for identifying mutual inductance parameters of a doubly-fed wind power generator. The method comprises the following steps that: according to a mathematical model of a doubly-fed wind power generator, a grid voltage and a stator voltage are oriented respectively during the no-load grid-connection control process of the doubly-fed wind power generator, wherein the rotor employs the motor convention and the stator employs the generator convention; a voltage error signal is adjusted by using a double-fed motor constant-voltage control method and accurate mutual inductance parameters are identified; and during the identification process, the voltage error signal is adjusted by using a PI controller to control a q-axis excitationcurrent reference signal. While, the constant-voltage control is realized, the accurate mutual inductance values are identified based on a mathematical relationship among a comparison signal c, a control output signal eta and a mutual inductance initial value Lm-o. After identification of the mutual inductance parameters, the PI control is removed, so that the system control complexity is reduced.

Description

technical field [0001] The invention relates to a method for identifying mutual inductance parameters of doubly-fed wind power generators based on constant voltage control Background technique [0002] For flexible grid-connected control and power decoupling control after grid-connected, the control method based on vector orientation requires motor mutual inductance parameters to obtain accurate reference values ​​of inner-loop current signals, or adds a compensation control link to make the stator voltage track the grid voltage. For the DFIG flexible grid-connected control with uncertain parameters, although the traditional voltage compensation control can be used to achieve constant voltage control, but due to the lack of mutual inductance parameters or inaccurate mutual inductance parameters, the switching of power decoupling control has a large jitter, which affects the control. stability. In order to solve the problem of DFIG parameter uncertainty, different parameter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/40H02J3/24H02P21/14
CPCH02J3/386H02J3/24H02J3/40H02P21/14Y02E10/76
Inventor 田鹏郝正航李泽滔曾实何俊贤
Owner GUIZHOU UNIV