Method and system for controlling double-fed wind turbine generator emergency power support

A doubly-fed wind turbine, power support technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problems of power system frequency instability, insufficient inertia capacity, etc., to suppress system power oscillation and realize damping The effect of controlling and suppressing power angle oscillation

Inactive Publication Date: 2018-05-04
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of unstable frequency and insufficient inertia capability in the existing power system, the present invention provides an emergency power support control method for double-fed wind turbines that can improve the frequency stability of the grid and compensate the inertia capability of the large grid

Method used

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  • Method and system for controlling double-fed wind turbine generator emergency power support
  • Method and system for controlling double-fed wind turbine generator emergency power support
  • Method and system for controlling double-fed wind turbine generator emergency power support

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Embodiment 1

[0042] refer to Figure 1-4 , the present embodiment provides a doubly-fed wind turbine emergency power support control method that fully considers grid frequency stability, including inertia power support and reactive power damping. The control method includes the following steps:

[0043]1) Quickly and accurately (high precision) detect the voltage and current values ​​at the outlet of the DFIG, calculate the grid frequency (high precision), the real-time active power of the DFIG, and the real-time reactive power of the DFIG;

[0044] 2) According to the grid frequency and combined with the dead zone setting, it is judged whether the DFIG has entered the emergency power support mode.

[0045] 3) If the DFIG enters the emergency power support mode, the DFIG uses the kinetic energy stored in the rotor for emergency power support, and the DFIG controls the speed of the wind turbine through rapid active power adjustment to release or store the DFIG The rotational kinetic energy...

Embodiment 2

[0088] This embodiment provides an emergency power support control system for doubly-fed wind turbines, which includes:

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Abstract

The invention discloses a method and system for controlling double-fed wind turbine generator emergency power support. According to the technical scheme, the method includes: calculating the frequencyof a power grid and the real-time active power and real-time reactive power of a double-fed wind turbine generator; according to the power grid frequency combining with dead zone setting, judging whether the double-fed wind turbine generator enters an emergency power support mode or not; if so, by the double-fed wind turbine generator, using kinetic energy stored in a rotor to perform fast powersupport; when the power grid frequency recovers to a value in the dead zone range, by the double-fed wind turbine generator, starting power recovering, and entering reactive power damping control. Themethod has the advantages that virtual inertia is achieved by the control strategy of the double-fed wind turbine generator, the double-fed wind turbine generator can fast perform emergency power support during power grid frequency disturbance, system damping is improved during frequency modulation recovering by the emergency power support combining with reactive power control, system frequency oscillation is suppressed, and the secondary impact of frequency can be prevented.

Description

technical field [0001] The invention relates to the control of wind power generators participating in power system frequency modulation, in particular to a doubly-fed wind generator emergency power support control method and system that fully considers the frequency stability of the power grid. Background technique [0002] With the continuous increase of wind power installed capacity, the fluctuation and uncertainty of wind energy will lead to the fluctuation of wind turbine output. At the same time, the different operating characteristics and control methods of wind turbine itself and conventional generators may also affect the security of power system. Stable operation brings some adverse effects. And when the wind power penetration rate in a system continues to increase, these effects will become more and more obvious, and even threaten the normal operation of the entire system, and even lead to system frequency instability in severe cases. The decoupling control system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50H02J3/24
CPCH02J3/24H02J3/386H02J3/48H02J3/50Y02E10/76
Inventor 吴跨宇杨靖房乐卢岑岑许国东陆海清张建承楼伯良张锋沈轶君熊鸿韬黄弘扬
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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