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High-voltage ride-through control method and device for permanent magnet direct-drive wind turbines

A wind turbine, permanent magnet direct drive technology, applied in the direction of wind power generation, control generator, control system, etc., can solve the problems of exacerbating the heat dissipation of the unloading resistor on the DC side and increasing costs, and achieve the elimination of reverse active power on the DC Effect of side voltage, stability of DC side voltage, and effect of avoiding heat dissipation problems

Active Publication Date: 2017-09-01
XINJIANG GOLDWIND SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will aggravate the heat dissipation problem of the unloading resistor on the DC side, and the control circuit based on the Insulated Gate Bipolar Transistor (IGBT) corresponding to the unloading resistor on the DC side also needs to be upgraded in hardware, increasing cost

Method used

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  • High-voltage ride-through control method and device for permanent magnet direct-drive wind turbines
  • High-voltage ride-through control method and device for permanent magnet direct-drive wind turbines
  • High-voltage ride-through control method and device for permanent magnet direct-drive wind turbines

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Embodiment 1

[0028] image 3 It is a logic schematic diagram of an embodiment of the high-voltage ride-through control method for the permanent magnet direct-drive wind power generating set provided by the present invention. Such as image 3 As shown, the high voltage ride-through control method of the permanent magnet direct drive wind power generator set in this embodiment may specifically include:

[0029] S301, according to the generator output active power difference △P gen , the preset high voltage ride-through duration △t and the mechanical angular velocity ω of the generator m Calculate the electromagnetic torque difference ΔT of the generator.

[0030] Specifically, the generator output active power difference △P gen Equal to the reverse active power P injected into the wind turbine by the grid neg , to eliminate the reverse active power P injected into the wind turbine by the grid neg On the DC side voltage U dc Impact. The preset high-voltage ride-through duration △t is ...

Embodiment 2

[0036] Figure 4 It is a logic schematic diagram of another embodiment of the high voltage ride-through control method for the permanent magnet direct drive wind power generating set provided by the present invention. Such as Figure 4 As shown, the high-voltage ride-through control method of the permanent magnet direct-drive wind turbine set in this embodiment gives image 3 A specific implementation of the high voltage ride-through control method of the permanent magnet direct drive wind power generator set in the illustrated embodiment, the output active power control method of the permanent magnet direct drive wind power generator in this embodiment may specifically include:

[0037] S401, according to the generator's DC bus active power P dc , The active power P injected by the wind turbine into the grid grid , The active power P lost by the unloading resistor on the DC side R and generator output active power P gen Calculate the output active power difference △P of ...

Embodiment 3

[0070] Figure 5 A structural schematic diagram of an embodiment of a high-voltage ride-through control device for a permanent magnet direct-drive wind power generating set provided by the present invention. Such as Figure 5 As shown, the high-voltage ride-through control device of the permanent magnet direct-drive wind power generator set in this embodiment can implement the above-mentioned image 3 The high voltage ride through control method of the permanent magnet direct drive wind power generating set in the illustrated embodiment. Specifically, the high-voltage ride-through control device for permanent magnet direct-drive wind power generators in this embodiment may include: an inertia response calculation module 51 , an electromagnetic torque calculation module 52 and a control module 53 . in:

[0071] The inertial response calculation module 51 is used to calculate the electromagnetic torque difference of the generator according to the output active power differenc...

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Abstract

The invention provides a method and a device for controlling high voltage ride through of a permanent-magnet direct-driven wind generator set. The method comprises the following steps: calculating an electromagnetic torque difference value of a generator according to an output active power difference value of the generator, preset high voltage ride through duration and a mechanical angle speed of the generator; calculating a set value of the electromagnetic torque of the generator according to the electromagnetic torque difference value of the generator and the electric angle speed of the generator; and carrying out torque control on the generator according to the set value of the electromagnetic torque of the generator. According to the method and the device for controlling the high voltage ride through of the permanent-magnet direct-driven wind generator set provided by the invention, the output active power of the generator is reduced; the effects on direct-current side voltage caused by reverse active power which is injected into the wind generator set by a power grid are removed; the direct-current side voltage is stable; the high voltage ride through function of the wind generator set is realized under the conditions of not changing a hardware structure and not increasing the cost; and aggravation of the heat dissipation problem caused by direct-current side unloading resistance is avoided.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a high-voltage ride-through control method and device for a permanent magnet direct-drive wind power generating set. Background technique [0002] During the normal operation of the permanent magnet direct drive wind turbine, the main circuit has the following power balance relationship: P gen -P grid =P dc =U dc I dc =U dc C dc (dU dc / dt). Among them, P gen is the output active power of the generator, P grid Active power injected into the grid for wind turbines, P dc is the active power of the DC bus, U dc is the DC side voltage, I dc is the DC side current, C dc is the capacitance value of the DC side voltage stabilizing capacitor. [0003] When the voltage on the grid side rises sharply, the grid will inject a certain amount of reverse power into the wind turbine, that is, the reverse active power P injected by the grid into the wind turbine neg , at this ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02P9/00H02P101/15
CPCY02E10/76
Inventor 艾斯卡尔
Owner XINJIANG GOLDWIND SCI & TECH CO LTD
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