Novel DC transmission system suitable for offshore wind power integration

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...

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

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