Method for large-sized wind-driven generator group to get through low voltage failure of electric network

A technology for wind turbines and low-voltage faults, which is used in wind power generation, control of generators, electrical components, etc., to achieve reliable action and facilitate dynamic stability.

Inactive Publication Date: 2009-03-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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Problems solved by technology

[0021] In short, each solution in the existing technology has its own limitations, and it is necessary to further explore new methods for large-scale doubly-fed induction wind turbines to resist and ride through low voltage

Method used

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  • Method for large-sized wind-driven generator group to get through low voltage failure of electric network
  • Method for large-sized wind-driven generator group to get through low voltage failure of electric network
  • Method for large-sized wind-driven generator group to get through low voltage failure of electric network

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Embodiment Construction

[0048] The present invention takes a typical large-scale doubly-fed induction wind-driven generating set of 2 megawatts as an example to illustrate the influence of low voltage caused by grid failure on the doubly-fed induction wind-driven generating set.

[0049] Figure 8 ~ Figure 13 A low-voltage fault occurred on the grid for a 2 MW large-scale doubly-fed induction wind turbine, and the PCC (Point of Common Connection) voltage was reduced to 15% U N (where U N When is the PCC rated voltage value), the transient process calculation waveform of the doubly-fed induction wind turbine current, flux linkage and its electromagnetic torque. can be seen:

[0050] 1) The stator flux linkage changes drastically, the stator and rotor currents change drastically, and the transient peak values ​​reach 10 times the rated value respectively, which seriously threatens the converter equipment of the double-fed induction wind turbine;

[0051] 2) During the process of voltage collapse and...

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Abstract

The invention discloses a method used for letting a large-scale wind generating set to ride through when a power network has low voltage failure, and the method belongs to the technical field of the electric power transmission. Aimed at solving the connecting problem of the wind power generation, the method has the technical proposal that a three-phase passive impedance network or a resistance network is connected between the wind generating set and the power network in series, and a three-phase AC switch composed of a power semiconductor device is connected with the passive impedance network or the resistance network in parallel; when the power network has the low voltage failure, the three-phase AC switch is switched off, thereby accessing into the passive impedance network or the resistance network; and when the voltage is recovered, the three-phase AC switch is switched on, thereby enabling the passive impedance network or the resistance network to have short circuit, and recovering the normal connection between the wind generating set and the power network. The invention not only can ensure the security of a doubly fed induction wind generating set when the power network has the low voltage failure, but also can uninterruptedly provide currents for the power network, thereby enabling a line protecting device to reliably work.

Description

technical field [0001] The invention relates to a method for a megawatt-level large-scale doubly-fed induction wind power generating set to ride through a low-voltage fault of a power grid. Background technique [0002] With the depletion of global chemical energy, wind power has attracted more and more attention. In the past 20 years, wind turbines have continued to be large-scale, and megawatt-scale doubly-fed induction wind turbines have become mainstream products in the current market. [0003] In the event of a low-voltage fault, the most important thing in the past was to protect the wind turbine itself and allow the wind turbine to be disconnected from the grid. Grid decoupling is no longer acceptable. The new international power grid requirements are: when a fault occurs, the MW-level wind turbine should provide a certain short-circuit current to ensure the reliable operation of the protection device, thereby reducing the scope of the impact of the voltage dip; at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P9/10H02J3/38
CPCY02E10/763Y02E10/76
Inventor 颜湘武
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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