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A method for suppressing transient oscillation of doubly fed wind turbine generator system based on virtual impedance of rotor string

A doubly-fed wind power generation and virtual impedance technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as complex control structure, difficult implementation, increased cost of hardware circuit investment, etc., to increase the rotor side Damping, suppressing dynamic disturbance, and shortening the effect of transient transition process

Pending Publication Date: 2019-01-18
STATE GRID GANSU ELECTRIC POWER CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although these two types of methods can ideally solve the problem of current and voltage transient oscillations, the control structure is complex and difficult to implement; at the same time, the investment in hardware circuits also greatly increases the cost.

Method used

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  • A method for suppressing transient oscillation of doubly fed wind turbine generator system based on virtual impedance of rotor string
  • A method for suppressing transient oscillation of doubly fed wind turbine generator system based on virtual impedance of rotor string
  • A method for suppressing transient oscillation of doubly fed wind turbine generator system based on virtual impedance of rotor string

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Embodiment 1

[0014] A transient oscillation suppression method for doubly-fed wind turbines based on the virtual impedance of rotor strings. The comparison ports behind the two PI controllers in the rotor current loop of the rotor-side converter are connected in series with the virtual impedance as a disturbance. Impedance and PI controller output and feed-forward decoupling calculation, the obtained rotor d, q axis voltage U rdc , U rqc The sum is used as the input of the next port.

[0015] The series-in impedance is a resistance and a reactance connected in series, wherein the resistance R a Take a value between [0.1 1], reactance L a Take a value between [0.01 0.1].

[0016] The feasibility of the present invention is analyzed from the theoretical basis below.

[0017] Such as figure 1 The shown parameters on the rotor side are converted to the steady-state equivalent circuit on the stator side, where L as , L ar Leakage reactance of stator and rotor, L m is the magnetizing ind...

Embodiment 2

[0071] Such as image 3 Shown, the doubly-fed generator control structure diagram based on the rotor string impedance. It can be seen from the structure diagram that the transient oscillation suppression method of doubly-fed wind turbine based on the virtual impedance of the rotor string mainly includes coordinate transformation to obtain the stator and rotor dq axis current components respectively; stator flux calculation and corresponding feed-forward decoupling Calculation, to obtain the c-phase rotor dq axis voltage components; power calculation, to obtain active and reactive reference power; command calculation, to obtain the reference value of the rotor dq axis current component; current loop control, to obtain the rotor dq axis voltage reference value; space vector pulse Broadband modulation and other links. machine side current i a i b i c As the input signal, the rotor current dq axis component i is obtained through the coordinate transformation link rd and i rq...

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Abstract

The invention discloses a method for suppressing transient oscillation of doubly-fed wind turbine generator system based on virtual impedance of a rotor string. The method is that the virtual impedance is serially connected to the comparison port of the two PI controllers in the rotor current loop of the rotor-side converter as the disturbance, that is, the series-in impedance is summed with the rotor d, q-axis voltages Urdc, Urqc calculated from the output of the PI controller and feedforward decoupling as the input of the next port. As that impedance is connected in series on the rotor side,the damp on the rotor side can be increased, the dynamic disturbance can be restrained, and the transient transient process can be shorten, thereby realizing the continuous grid connection of the doubly-fed wind turbine generator system during the fault period. Therefore, not only the principle and the structure are simple, the realization is easy, but also the hardware cost does not need to be increased, and the shortcomings of the prior method are remedied.

Description

technical field [0001] The invention relates to a method for suppressing the transient oscillation of a doubly-fed wind power generator based on the virtual impedance of a rotor string, belongs to the technical field of wind power grid connection, and is applied to the continuous grid-connected operation of a doubly-fed wind power generator during a power grid fault. Background technique [0002] With the increase of wind power grid-connected scale and installed capacity, the transient smooth transition of wind turbines is an urgent problem to be solved. At present, there are two main methods for dealing with transient overcurrent oscillations and transient induced overvoltage oscillations caused by power grid faults (voltage dips and voltage surges) at home and abroad: one is to improve the The vector control strategy of the converter is used to feed the corresponding compensation amount to suppress the transient overcurrent; the second is to increase the hardware circuit, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/386H02J3/24Y02E10/76
Inventor 汪宁渤董海鹰马明杨杰吕清泉马彦宏韩旭杉韩自奋李晓虎王定美周强张健美王明松陈钊丁坤赵龙周识远黄蓉张金平张艳丽张睿骁张珍珍高鹏飞张彦琪
Owner STATE GRID GANSU ELECTRIC POWER CORP