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A low voltage ride through control method and device

A low-voltage ride-through and control method technology, applied in circuit devices, AC network voltage adjustment, wind power generation and other directions, can solve the problems of SVG side voltage tracking failure, etc., to avoid tracking failure, fast reactive power compensation, transient inrush current small effect

Active Publication Date: 2019-12-10
XJ ELECTRIC +2
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-voltage ride-through control method and device, which is used to solve the problem of voltage tracking failure on the SVG side caused by voltage failure on the high-voltage side of the prior art power grid

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  • A low voltage ride through control method and device
  • A low voltage ride through control method and device
  • A low voltage ride through control method and device

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Embodiment Construction

[0026] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] An embodiment of a low voltage ride through control method of the present invention:

[0028] Such as figure 2 As shown, when the power grid is operating normally, the SVG is generally in the reactive power closed-loop mode or the voltage closed-loop control mode; when the grid voltage drops, the SVG needs to switch to the LVRT (low voltage ride through) mode. Such as image 3 As shown, the control method when the SVG enters the LVRT mode includes the following steps:

[0029] Collect the actual positive-sequence voltage amplitude U on the high-voltage side of the power grid pg ', the actual positive sequence voltage amplitude U on the SVG side pg , the voltage reference value of the high-voltage side of the power grid ( image 3 set as 1pu) and the actual positive sequence voltage amplitude U on the high voltage side of the pow...

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Abstract

The invention relates to a low-voltage ride-through control method and apparatus. A total current instruction value is generated by summation of a current instruction value which is obtained by difference between a high-voltage side voltage reference value and a high-voltage side actual positive sequence voltage of a power grid, and a current instruction value which is obtained by difference between an SVG side voltage reference value and an SVG side actual positive sequence voltage; then a difference value between the total current instruction value and the actual positive sequence current is obtained; and PWM modulation wave is generated through a regulator. When the power grid falls off, a control strategy in combination with high-voltage side voltage control and SVG side voltage control is rapidly switched, so as to realize rapid reactive compensation; and therefore, it is ensured that transient state impact current is low at the falling-off moment of the voltage, and SVG side voltage tracking failure also can be avoided.

Description

technical field [0001] The invention belongs to the technical field of electric energy control, and in particular relates to a low-voltage ride-through control method and device. Background technique [0002] At present, wind power technology has entered a period of rapid development in China, and the installed capacity of wind turbines ranks first in the world. The variability of wind resources, the centralized distribution of wind turbines, and the large capacity of wind farm power transmission and distribution systems have caused fluctuations in the grid-connected power of wind turbines, for example, small active power factors, unbalanced three-phase power, System low voltage and overvoltage problems, etc. SVG (Static Var Generator) is a new generation of reactive power compensation equipment. It is the best choice for wind farm reactive power compensation and voltage stability. It takes both reactive power compensation and harmonic control into account, and can assist w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/16
CPCH02J3/16H02J3/386Y02E10/76Y02E40/10Y02E40/30
Inventor 孙健许恩泽刘海舰刘刚左广杰高志军王青龙
Owner XJ ELECTRIC
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