Control method for improving low voltage ride through capability of wind power plant

A technology of low voltage ride-through and control method, which is applied in wind power generation, single grid parallel feeding arrangement, etc., can solve the problems of reducing fault recovery time, etc., so as to reduce fault recovery time, maintain stability, and reduce Crowbar action. effect of probability

Inactive Publication Date: 2016-02-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER +2
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Problems solved by technology

[0003] The present invention aims at the problem of low-voltage ride-through under the fault of the current VSC-HVDC grid-connected wind farm side, and proposes a control method for improving the lo

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  • Control method for improving low voltage ride through capability of wind power plant
  • Control method for improving low voltage ride through capability of wind power plant
  • Control method for improving low voltage ride through capability of wind power plant

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Embodiment Construction

[0027] Traditional DFIG and improved DFIG models such as figure 1 , 2 shown. The purpose of the crowbar in traditional doubly-fed wind turbines is to protect the rotor-side converter RSC from being burned in case of failure. Although the rotor-side converter is protected, when the crowbar operates, the DFIG becomes a conventional asynchronous generator and needs to be absorbed from the grid. A large amount of reactive power, and sacrificed the reactive power support capability of the wind turbine when it fails. The improved DFIG uses active DC-Chopper with Crowbar to replace the traditional Crowbar protection technology, and controls the input of DC-Chopper switch according to the DC bus voltage. When the grid voltage drops, the output power of the grid-side converter GSC is limited, and the energy accumulates on the DC side, causing the DC bus voltage U dc When it reaches a certain value, the IGBT in the DC-Chopper circuit is triggered to turn on, and the unloading resisto...

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Abstract

The invention relates to a control method for improving the low voltage ride through capability of a wind power plant. According to the invention, a voltage value of a grid-connection point at the wind power plant side is detected in real time and compared with a given reference value of the grid-connection point voltage, a difference value is subjected to conventional calculation of a PI controller, and a total reactive value required by a power grid is acquired. Meanwhile, DFIG direct current bus voltage is monitored and compared with a given value so as to control switching of a direct current unloading resistor, maintain the stability of the direct current bus voltage and prevent rotor side overcurrent, thereby reducing the actuating probability of a double-fed fan. Reactive power distribution is judged and realized among a grid-side converter, a double-fed fan stator-side converter and a VSC-HVDC wind power plant-side converter through acquiring rotor-side rotor protection actuating signals of the double-fed fan, so that the wind power plant is ensured to acquire enough reactive compensation when facing various faults with different severities, the transient voltage stability of the wind power plant is maintained, the actuating probability of the double-fed fan is reduced, the fault recovery time is shortened.

Description

technical field [0001] The invention relates to a doubly-fed wind turbine control technology, in particular to a control method for improving the low-voltage ride-through capability of a wind farm based on the coordinated control of a DFIG model and a voltage source type high-voltage direct current transmission technology. Background technique [0002] Today, wind power technology is showing a momentum of rapid development, the installed capacity is getting bigger and bigger, and the proportion in the power grid is also rising. The increase of wind farm scale and grid-connected transmission distance makes traditional AC transmission present various disadvantages. The voltage source-based high-voltage direct current transmission (VSC-HVDC) is a long-distance large-scale power transmission system because its converters use fully-controlled power electronic devices, which can improve the power quality of grid-connected points and reduce the impact of wind farms on the grid thro...

Claims

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Application Information

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IPC IPC(8): H02J3/50
CPCY02E10/76
Inventor 边晓燕王本利施勇姚超群田春笋俞晓峰耿艳符杨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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