Low-voltage combined ride-through control method and system for wind power low-frequency power transmission system

A power transmission system, low voltage technology, applied in the field of low voltage combined ride-through control of wind power low frequency transmission system, to achieve the effect of improving wind energy utilization rate, fast response speed, and high power utilization rate

Pending Publication Date: 2021-12-28
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a low-voltage combined ride-through control method and system for wind power low-f

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  • Low-voltage combined ride-through control method and system for wind power low-frequency power transmission system
  • Low-voltage combined ride-through control method and system for wind power low-frequency power transmission system
  • Low-voltage combined ride-through control method and system for wind power low-frequency power transmission system

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[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0054] In the description of the present invention, it is to be understood that the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, The existence or addition of a whole, step, operation, element, component, and / or a collection thereof.

[0055] It should also be understood that the terminology used in t...

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Abstract

The invention discloses a low-voltage combined ride-through control method and system for a wind power low-frequency power transmission system. The control system is used for monitoring a power grid voltage signal in real time; if a low-voltage fault occurs, a current auxiliary controller is designed to solve the reactive current injection problem according to the degree of voltage drop, a concentrated energy storage device is adopted on the low-frequency side of the converter, an energy storage system is combined with a draught fan to control and absorb residual unbalanced power, and during low-voltage ride-through, part of power which cannot be transmitted due to capacity limitation of the current converter is stored in the storage battery; if the fault is eliminated, the energy storage device is allowed to release energy in a fixed power mode, and the energy is fed back to the power grid. According to the control strategy, the reactive current injection requirement can be ensured during low voltage ride-through, unbalanced power is transferred, redundant power is fed back to a power grid after a fault is ended, and the control strategy is very suitable for multiple voltage drop faults or faults with long voltage drop duration.

Description

technical field [0001] The invention belongs to the technical field of power system transmission and distribution applications, and in particular relates to a low-voltage combined ride-through control method and system for a low-frequency wind power transmission system. Background technique [0002] In the context of global energy transformation and vigorous development of new energy, the proportion of offshore wind power in new energy power generation technologies continues to increase, and research on offshore wind power related technologies has become increasingly important. To develop large-scale offshore wind power, on the one hand, it is necessary to improve the grid-connected reliability of wind power itself, and on the other hand, it is necessary to develop new technical roads, improve transmission efficiency, maximize the transmission capacity of existing transmission lines or alleviate the pressure of offshore transmission channel construction. [0003] In 1994, Pr...

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Application Information

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IPC IPC(8): H02J3/16H02J3/32H02J3/50H02J3/02H02J3/24
CPCH02J3/16H02J3/32H02J3/50H02J3/02H02J3/24H02J2300/28H02J2203/20Y02E10/76Y02E40/30Y02E70/30
Inventor 宁联辉仪力萌王琦晨周治伊
Owner XI AN JIAOTONG UNIV
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