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Quick restart method for rotor side converter of doubly-fed wind generating set

A technology for rotor-side converters and wind turbines, which is applied in the control of generators, motor-generators, and electromechanical brakes, etc., and can solve the problems of secondary overcurrent of doubly-fed motor rotors.

Active Publication Date: 2012-09-19
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0008] From the above analysis, it can be seen that during the power grid fault, because the stator is not off the grid, the rotor of the doubly-fed motor will have a relatively large terminal voltage, so when the active crowbar circuit is disconnected and the rotor-side converter is turned on again, it may cause relatively large voltage. Large inrush current causes double-fed motor rotor secondary overcurrent

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  • Quick restart method for rotor side converter of doubly-fed wind generating set
  • Quick restart method for rotor side converter of doubly-fed wind generating set
  • Quick restart method for rotor side converter of doubly-fed wind generating set

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[0037] The following will combine figure 1 , figure 2 , image 3 , clearly and completely describe the technical solutions in the embodiments of the present invention, obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] In order to ensure the safe and reliable operation of the doubly-fed converter when the power grid fails, generally the grid-side converter 103 (near the grid) and the machine-side converter 101 (closer to the doubly-fed converter) on the rotor side of the doubly-fed wind turbine Generator DIFG) will perform a short-term blocking control, and if necessary, the active crowbar circuit 102 connected to the rotor side winding will also participate in the work to discharge the huge energy cou...

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Abstract

An embodiment of the invention provides a quick restart method for a rotor side converter of a doubly-fed wind generating set. Momentary rotor current, stator voltage, synchronous angular speed, doubly-fed motor rotor angular speed and doubly-fed motor rotor slip angular speed of the rotor side converter before restarting are detected, momentary voltage of the rotor side end of the rotor side converter before restarting is calculated to serve as a feed-forward compensation term outputted by a rotor current regulator when the rotor side converter is restarted, the influence of the rotor side induced electromotive force of the rotor side converter is offset when the rotor side converter is restarted, secondary over-current is avoided in the restarting process of the rotor side converter of the doubly-fed wind generating set, the quick control capacity of the rotor side converter is improved, and the low-voltage ride-through capacity of the doubly-fed wind generating set is enhanced.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for quickly restarting a rotor-side converter of a doubly-fed wind power generating set. Background technique [0002] With the rapid increase in the installed capacity of wind turbines, their proportion to the total global power generation is also increasing. In order to deal with the negative impact of large-scale grid-connected wind turbines on the power grid, power grid companies around the world have also successively introduced Strict technical regulations for connecting wind farms to the power grid, including low-voltage ride-through capability of wind turbines, that is, when the grid experiences a short-term drop, the wind turbines can operate without leaving the grid, and provide certain reactive power support to the grid until the grid returns to normal. [0003] However, since the stator side of the doubly-fed wind turbine is directly connected to the powe...

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Application Information

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IPC IPC(8): H02P21/14
Inventor 曹仁贤邹海晏余勇屠运武邓立荣
Owner SUNGROW POWER SUPPLY CO LTD
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