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A high-voltage ride-through control method for direct-drive wind turbines

A technology for a wind turbine and a control method, which is applied to wind power generation, electrical components, circuit devices, etc., can solve problems such as off-grid operation of direct-drive wind turbines, and achieves a simple and easy method, convenient operation, and a solution to off-grid operation. Effect

Active Publication Date: 2021-01-01
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem in the prior art that the direct-drive wind turbine runs off-grid due to a sudden rise in the grid voltage, and propose a high-voltage ride-through control method for the direct-drive wind turbine

Method used

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  • A high-voltage ride-through control method for direct-drive wind turbines
  • A high-voltage ride-through control method for direct-drive wind turbines
  • A high-voltage ride-through control method for direct-drive wind turbines

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0025] Such as Figure 1-4 As shown, in this example, a direct-drive wind turbine high-voltage ride-through control method is provided:

[0026] Step 1: Real-time detection of the effective value of the grid-side grid voltage, based on the peak value of the phase voltage, to calculate the per-unit value of the phase voltage In the formula E. ph is the peak value of the grid phase voltage at the grid side, V LL is the grid-connected point-to-line voltage, E ph_b is the peak value of the phase voltage of the grid-connected point under rated conditions;

[0027] Step 2: Determine the per-unit value E of the phase voltage ph_pu Is it greater than 1.1pu;

[0028]...

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Abstract

The invention relates to the technical field of direct-drive wind generating sets, and especially relates to a direct-drive wind generating set high voltage ride through control method. The direct-drive wind generating set high voltage ride through control method comprises detecting grid connection point voltage and DC bus voltage; calculating the difference between power grid voltage and rated voltage, if the difference is within 10%, carrying out control by means of a unity power factor with reactive current being zero; if the difference is higher than 10% and smaller than 20%, calculating areactive current reference value through a provided reactive current calculation formula or setting the reactive current reference value according to a power grid dispatching instruction, then calculating an active current reference value according to the reactive current reference value and the capacity of a grid-side inverter; if the difference is higher than 10%, emitting a blocking signal, and cutting off the wind generating set. During the grid voltage rise period, unbalanced energy at the DC side is absorbed by a super-capacitor. According to the invention, the direct-drive wind generating set can operate in a fault ride-through manner during the grid voltage rise period, and the working stability of the direct-drive wind generating set can be improved.

Description

technical field [0001] The invention relates to the technical field of direct-drive wind power generators, in particular to a high-voltage ride-through control method for direct-drive wind power generators. Background technique [0002] Direct-drive permanent magnet synchronous wind turbines have become one of the main development directions of modern large-scale variable-speed constant-frequency wind turbines because of their simple structure, high power generation efficiency, and good operational reliability. With the increase of installed capacity of wind power, the mutual influence between wind power and grid becomes more and more obvious, especially the resistance ability of wind turbines to grid. It will cause the wind turbine to run off-grid. [0003] At present, the proportion of wind power in the power grid has reached a relatively high level. If the power grid fails and runs off the grid, it will increase the difficulty of recovery and control of local power grid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/386H02J3/28Y02E10/76Y02E70/30
Inventor 刘广忱胡剑文
Owner INNER MONGOLIA UNIV OF TECH
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