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A doubly-fed wind power generator fault voltage ride-through control method and system

A wind turbine and fault voltage technology, applied in wind power generation, AC network voltage adjustment, reducing/preventing power oscillation, etc., can solve problems such as the inability to realize high and low voltage ride-through at the same time, and realize complex and single fault ride-through at the same time. Achieve the effect of improving fault ride-through capability, intuitive and concise analysis method, and assisting grid voltage recovery

Active Publication Date: 2022-06-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this high-voltage ride-through method can meet the requirements of the wind power grid-connected code for the high-voltage ride-through capability of the unit during the voltage increase process, the implementation is relatively cumbersome, and the control mode needs to be switched based on the calculated overvoltage criterion.
[0006] The inventor believes that the above-mentioned schemes propose different solutions for the fault ride-through of wind turbines, but they all have certain limitations, that is, only a single fault ride-through can be achieved, and the two goals of high and low voltage ride-through cannot be achieved at the same time. The unification of control strategies during voltage swells and sags is relatively complex, or requires coordinated control with the power grid, or requires control mode switching, and the economic cost is higher

Method used

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  • A doubly-fed wind power generator fault voltage ride-through control method and system
  • A doubly-fed wind power generator fault voltage ride-through control method and system
  • A doubly-fed wind power generator fault voltage ride-through control method and system

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Embodiment 1

[0041] This embodiment provides a fault voltage ride-through control method for a doubly-fed wind turbine, such as figure 1 As shown, the stator of the doubly-fed asynchronous wind turbine is directly connected to the power grid, and the rotor is connected to the power grid through a back-to-back three-phase two-level voltage converter, which is divided into a grid-side converter (GSC) and a rotor-side converter ( RSC); the rotor-side converter is used to realize the power control of the doubly-fed asynchronous wind turbine and provide reactive power support during the fault ride-through process. like figure 2 shown, including:

[0042] S1: Obtain the three-phase current of the doubly-fed wind turbine rotor, and obtain the DC component i after coordinate transformation of the three-phase current rd with i rq ;

[0043] S2: Obtain the d-axis current command value according to the dynamic voltage command value

[0044] S3: Obtain the q-axis current command value based on...

Embodiment 2

[0086] This embodiment provides a fault voltage ride-through control system for a doubly-fed wind turbine, including:

[0087] The data acquisition module is configured to acquire the three-phase current of the rotor of the doubly-fed wind turbine, and obtain the DC component after coordinate transformation of the three-phase current;

[0088] The first command processing module is configured to obtain the d-axis current command value according to the dynamic voltage command value;

[0089] The second command processing module is configured to obtain the q-axis current command value based on the active command value of the maximum wind energy tracking control;

[0090] The control module is configured to adjust the DC component, the d-axis current command value and the q-axis current command value to obtain a modulation signal through the current loop adjustment, and generate a driving signal for the switch tube of the rotor-side converter according to the modulation signal, s...

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Abstract

The invention discloses a doubly-fed wind power generator fault voltage ride-through control method and system, comprising: obtaining the three-phase current of the doubly-fed wind power generator rotor, and obtaining the DC component after coordinate transformation of the three-phase current; and obtaining the DC component according to the dynamic voltage command value The d-axis current command value; the q-axis current command value is obtained based on the active power command value of the maximum wind energy tracking control; the modulation signal is obtained by adjusting the DC component, the d-axis current command value and the q-axis current command value through the current loop, and the rotor is generated according to the modulation signal The driving signal of the switch tube of the side converter is used to control the fault voltage ride-through of the doubly-fed wind turbine. It can dynamically change the control voltage command value to realize the reactive power exchange between the wind turbine and the grid, and improve the high and low voltage fault ride-through capability of the double-fed asynchronous wind turbine DFIG.

Description

technical field [0001] The invention relates to the technical field of wind turbine converter control, in particular to a fault voltage ride-through control method and system for a doubly-fed wind turbine. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In recent years, with the continuous increase of the proportion of wind power in the power grid, the installed capacity of wind power has reached a relatively high level. If the wind turbine does not have a certain ability to withstand power grid faults, passive protection solutions are still adopted in the event of grid voltage faults. It will increase the difficulty of fault recovery of the entire system, and may even deteriorate the security and stability of the power grid, which will eventually cause a chain reaction and lead to system collapse. Therefore, effective ride-through control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/50H02J3/38H02J3/24H02J3/16
CPCH02J3/50H02J3/38H02J3/24H02J3/16Y02E10/76Y02E40/30
Inventor 王辉王艺霏王腾鑫邢阳刘畅
Owner SHANDONG UNIV
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