Novel DC transmission system suitable for offshore wind power integration

A DC power transmission system and offshore wind power technology, applied in wind power generation, power transmission AC network, electrical components, etc., can solve the problems of high cost and high probability of commutation failure, reduce design capacity, improve operating efficiency, and reduce system costs Effect

Inactive Publication Date: 2020-01-21
NARI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies in the prior art, the present invention provides a new DC transmission system suitable for grid-connected offshore wind power, which solves the problems of requiring harmonic and reactive power compensation devices, high probability of commutation failure, and high cost

Method used

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  • Novel DC transmission system suitable for offshore wind power integration
  • Novel DC transmission system suitable for offshore wind power integration

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0027] Such as figure 1 As shown, a new DC transmission system suitable for grid-connected offshore wind power includes: a converter transformer with a compensation winding on the rectification side, a compensation converter connected to the compensation winding on the rectification side and its control system, a thyristor rectifier station, The thyristor inverter station, the converter transformer with compensation winding on the inverter side, the compensation converter connected to the compensation winding on the inverter side and its control system, the thyristor rectifier station and the thyristor inverter station are connected through DC transmission lines; The compensation converter and ...

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Abstract

The invention discloses a novel DC transmission system suitable for offshore wind power integration. The novel DC transmission system is characterized by comprising a converter transformer with a compensation winding on a rectification side, a compensation converter connected to the compensation winding on the rectification side, a control system of the compensation converter, a thyristor rectification station, a thyristor inversion station, a converter transformer with a compensation winding on an inversion side, a compensation converter connected to the compensation winding on the inversionside, and a control system of the compensation converter. The thyristor rectification station and the thyristor inversion station are connected through a DC transmission line. The compensation converters and the control systems thereof are used for controlling the compensation currents of the compensation windings. Harmonic wave and reactive power compensation is carried out on the secondary sidethrough the transformer compensation winding side, and therefore, harmonic waves are prevented from entering a primary side power grid and an inversion side power grid. The novel DC transmission system has the advantages of both a conventional high-voltage DC transmission technology and a flexible DC transmission technology, and is suitable for offshore wind power transmission.

Description

technical field [0001] The invention relates to the technical field of wind power grid connection and direct current transmission, in particular to a novel direct current transmission system suitable for offshore wind power grid connection. Background technique [0002] Offshore wind power usually uses different transmission technologies to send out the power flow. Generally, when the connection distance is less than 75km, the wind farm adopts a high-voltage alternating current transmission (HVAC) grid-connected scheme; when the connection distance exceeds 150km, the wind farm adopts high-voltage direct current transmission (HVDC) and net program. HVDC transmission includes conventional high-voltage direct current transmission (LCC-HVDC) and flexible direct current transmission (VSC-HVDC), both of which have their own advantages and disadvantages. LCC-HVDC adopts thyristor converter station, which has high operating efficiency and high reliability, but there are problems su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/01H02J3/18
CPCH02J3/01H02J3/1821H02J3/36Y02E10/76Y02E40/30Y02E40/40Y02E60/60
Inventor 吕宏水武迪骆健陈璐瑶刘旭光
Owner NARI TECH CO LTD
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