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Offshore wind power system fault combined ride-through method based on flexible direct current MMC converter

A technology for offshore wind power and system faults, applied in wind power generation, AC network voltage adjustment, power transmission AC network, etc., can solve the problems that the power grid affects the safe and stable operation of MMC converters, so as to improve the fault ride-through capability and reduce wind power The effect of absorbing and improving power imbalance

Active Publication Date: 2021-02-23
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the offshore wind power is connected to the grid through the flexible straight MMC converter, the failure of the grid will affect the safe and stable operation of the MMC converter.

Method used

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  • Offshore wind power system fault combined ride-through method based on flexible direct current MMC converter
  • Offshore wind power system fault combined ride-through method based on flexible direct current MMC converter
  • Offshore wind power system fault combined ride-through method based on flexible direct current MMC converter

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0037] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combina...

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Abstract

The invention relates to an offshore wind power system fault combined ride-through method based on a flexible direct current MMC converter. According to the method, a grid-side MMC is allowed to redistribute an active and reactive reference current through a reactive priority link when a fault happens to a power grid and the voltage drops, and reactive current support is provided for the voltage recovery of the power grid. The wind power plant increases the pitch angle of a fan and reduces the active output of the fan by adjusting the active power set value of the fan, that is, the absorptionof wind power during a fault period is reduced, the power imbalance phenomenon between a grid-side MMC and an offshore MMC is improved, excessive power in a direct current link is effectively prevented from being stored in a direct current capacitor, the MMC converter is prevented from being damaged due to overvoltage during a fault period, so that the fault ride-through capability of the offshoreflexible direct-current wind power system is effectively improved, and the safe and stable operation of the system is ensured.

Description

technical field [0001] The invention relates to the technical field of offshore wind power systems, in particular to a combined fault ride-through method for offshore wind power systems based on flexible straight MMC converters. Background technique [0002] In recent years, large-capacity and long-distance offshore wind power will be a trend in the future development of wind power. Modular multilevel converter-based high-voltage DC (MMC-HVDC) technology has modular High level, low switching loss, small output voltage distortion, active and reactive power decoupling control and other advantages, become an ideal solution for grid connection of large offshore wind farms. [0003] As a new generation of DC transmission technology, flexible DC transmission is similar in structure to HVDC, and is still composed of a converter station and a DC transmission line (usually a DC cable). The Voltage Source Converter based High Voltage Direct Current Transmission (VSC-HVDC) technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/50H02J3/16
CPCH02J3/36H02J3/50H02J3/16Y02E10/76Y02E40/30Y02E60/60
Inventor 叶荣唐雨晨薛静玮孟永庆王海波于建洋
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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