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High-voltage ride-through control method for wind power doubly-fed converter

A doubly-fed converter and control method technology, applied in wind power generation, electrical components, single-network parallel feeding arrangements, etc., can solve problems such as inability to meet high-voltage ride-through requirements, and achieve the effect of saving upgrade costs

Active Publication Date: 2020-08-07
CORONA WIND EQUIP BEIJING CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings that the existing conventional doubly-fed converter control methods cannot meet the high voltage ride-through requirements, the present invention proposes a doubly-fed converter high-voltage ride-through control method

Method used

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  • High-voltage ride-through control method for wind power doubly-fed converter
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  • High-voltage ride-through control method for wind power doubly-fed converter

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0044] The topology diagram of the double-fed converter is as follows figure 1 As shown, the main circuit of the doubly-fed converter of the present invention is composed of grid-side converter 101, machine-side converter 102 and DC unloading 103. The grid-side converter 101 and machine-side converter 102 pass through DC The DC unloading 103 is connected to the positive and negative poles of the DC side. The main controller 111 includes two parts, the grid-side controller and the machine-side controller, which control the grid-side converter 101 and the machine-side converter 102 respectively.

[0045] The grid-side current controller has a double-loop structure. The set value of the DC bus voltage outer loop is obtained by subtracting the DC bus voltage feedback value from the DC bus voltage set value, and the DC bus voltage deviation is obtained through the PI...

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Abstract

The invention relates to a high-voltage ride-through control method for a wind power double-fed converter. According to the method, when the voltage of a power grid rises to 1.1-1.3 times of nominal voltage, an optimized phase-locked loop technology is used, a grid-side converter prevents overmodulation through the flexible control of a direct-current bus voltage, and a machine side outputs inductive reactive current to reduce the amplitude of the voltage of the power grid. By using the method provided by the invention, under the condition that the voltage of the power grid is 1.1-1.3 times ofthe nominal voltage, the converter can continuously operate without off-grid, and inductive reactive power output meeting the national standard is provided at the same time without complex mode switching and hardware cost increase.

Description

Technical field [0001] The invention relates to a control method of a wind power double-fed converter. Background technique [0002] In recent years, the issue of high voltage ride-through of wind farms has received more and more attention. In July 2019, the high-penetration standard "GB / T 36995-2018 Wind Turbine Generator Fault Voltage Ride Through Capability Test Regulations" was issued and implemented. [0003] The high penetration standard requires: when the voltage at the grid connection point of the wind farm increases to 1.3 times the nominal voltage, the wind turbine should be able to operate continuously without going off the grid for 500ms; when the voltage is increased to 1.25 times the nominal voltage, it should be able to operate continuously without going off the grid 1s; when it is increased to 1.2 times the nominal voltage, it should be able to run continuously for 10s without disconnecting the grid; when it is 1.1 times the nominal voltage, the wind turbine should ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/50
CPCH02J3/38H02J3/48H02J3/50H02J2300/28Y02E10/76
Inventor 马强武鑫吕佃顺王立鹏王朝孙明丽冯莉许洪华赵栋利
Owner CORONA WIND EQUIP BEIJING CO LTD