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Current source hybrid offshore wind farm DC converter

A current source type, inverter technology, applied in the direction of converting AC power input to DC power output, wind power generation, electrical components, etc., can solve the problems of high cost, heavy weight and large volume.

Active Publication Date: 2020-07-31
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of large volume, heavy weight and high cost of existing offshore wind farm DC converters, and propose a current source type hybrid offshore wind farm DC converter

Method used

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  • Current source hybrid offshore wind farm DC converter

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Such as figure 1 As shown, the current source hybrid offshore wind farm DC converter of the present invention consists of a 12-pulse converter LCC, a low-voltage small-capacity auxiliary converter based on a current source converter TOD-CSC that can be turned off. Current transformer, three DC reactors L1, L2 and L3, two multi-winding transformers T1, T2.

[0016] The DC negative terminal of the 12-pulse converter LCC is connected to the DC positive terminal of the current source converter TOD-CSC based on a turn-off device through the DC reactor L2; the DC positive terminal of the 12-pulse converter LCC is used as a current source hybrid The positive terminal of the DC converter in the offshore wind farm is connected to the positive terminal of the high-voltage DC side through the DC reactor L1; the DC negative terminal of the current ...

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Abstract

The invention discloses a current source type hybrid offshore wind field direct current converter. The converter is composed of a 12-pulse converter LCC, a low-voltage small-capacity auxiliary converter of a current source type converter TOD-CSC based on a turn-off device, three direct-current reactors L1, L2 and L3, and two multi-winding transformers T1 and T2. In a wind field starting stage, the12-pulse converter LCC is in a direct mode, and the turn-off device-based current source type converter TOD-CSC as the auxiliary converter is used for establishing a voltage of a wind field alternating current internal network and returning the power, so that black start of a wind field unit is realized; and in a power generation stage of the wind field unit, the output power is continuously increased, the 12-pulse converter LCC is switched to be in a direct-current voltage control mode from the direct mode and undertakes a power transmission task, and the turn-off device-based current sourcetype converter TOD-CSC as the auxiliary converter is in a zero active power operation state.

Description

technical field [0001] The invention relates to a DC converter of an offshore wind field. Background technique [0002] Modular Multilevel Converter (MMC) has the advantages of modular structure, multi-level output, strong reliability and high efficiency, and is suitable for building large-capacity long-distance high-voltage direct current transmission systems. As stated in patent 210520107377.7, when the modular multilevel converter is applied to offshore wind power, it can solve the voltage equalization problem caused by the series connection of two-level or three-level corresponding devices. However, with the increase in the number of power modules used by MMC , the volume and weight of the converter are relatively large, and the control system is very complicated, and the manufacturing cost of the converter is relatively high. For DC transmission applications in offshore wind farms, the construction of offshore platforms is expensive, which further increases the system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/521H02J3/38
CPCH02J3/386H02M7/483H02M7/521Y02E10/76
Inventor 栾轲栋李耀华李子欣王平赵聪徐飞
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI