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Light-weight hybrid converter topology suitable for offshore wind power delivery and control strategy thereof

An offshore wind power and inverter technology, which is applied in output power conversion devices, wind power generation, power transmission and AC networks, etc., can solve the problems of high cost and technical content, and achieve the effect of reducing volume and weight and reducing switching loss.

Active Publication Date: 2021-04-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

However, CSC needs to adopt a new type of reverse-resistance semiconductor switching device, and its application to high-voltage and large-capacity occasions requires high cost and technical content.

Method used

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  • Light-weight hybrid converter topology suitable for offshore wind power delivery and control strategy thereof
  • Light-weight hybrid converter topology suitable for offshore wind power delivery and control strategy thereof
  • Light-weight hybrid converter topology suitable for offshore wind power delivery and control strategy thereof

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Embodiment Construction

[0027] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0028] figure 1 It is the topological structure diagram of offshore wind power converter station, and all converters are analyzed with 12 pulses. like figure 1 As shown, after the wind turbine is connected to the machine-side converter and the grid-side converter, it is connected to the offshore sending-end converter through a short-distance cable, transmitted through a long-distance submarine cable, and then inverted by the on-shore receiving-end converter. Then merged into the land AC power grid. The offshore sending-end converter is composed of 12-pulse CSC and 12-pulse DR connected in parallel on the AC side and connected in series on the DC side. .

[0029] In the black start phase of the wind turbine, only 1...

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Abstract

The invention provides a light-weight hybrid converter topology suitable for offshore wind power delivery and a control strategy of the light-weight hybrid converter topology. Large-scale fans are gathered to an offshore alternating-current bus through a converter, an offshore converter carries out rectification, an onshore converter carries out inversion through a direct-current cable and then the current is connected to an alternating-current power grid. The offshore converter adopted by the invention comprises an active commutation type current source converter (CSC) and a diode rectifier (DR), wherein the CSC is cascaded with the DR. In the wind power plant starting stage, the CSC establishes an offshore alternating-current voltage to realize power return; in the power generation sending-out stage of the wind power plant, a fan converter and an offshore sending terminal CSC jointly control active power and alternating voltage / frequency, and an onshore receiving terminal converter adopts constant direct voltage control. The technical scheme provided by the invention has the advantages that the CSC can supply power to the passive system to realize black start of the offshore windplant; the sending terminal converter adopts CSC and DR cascade connection, the size and the weight of the offshore platform can be reduced, and therefore the cost is reduced.

Description

technical field [0001] The invention relates to the technical fields of direct current transmission and power electronics, in particular to a lightweight hybrid converter topology and control strategy suitable for offshore wind power transmission. Background technique [0002] my country's offshore wind energy resources are abundant and close to the load center in the southeast, so it has great potential for development. At present, the type of converter widely used in engineering is Voltage Source Converter (Voltage Source Converter, VSC), and its sub-module capacitor has a large weight and volume, which increases the cost of the entire offshore platform. [0003] Some scholars have proposed to use a diode rectifier (Diode Rectifier, DR) to send out the scheme at sea, which greatly reduces the volume of the offshore booster platform, and also reduces the cost and operation loss. However, the diode cannot establish the AC voltage of the wind farm's internal network, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M5/458
CPCH02J3/36H02M5/4585Y02E60/60
Inventor 赵成勇郭小江夏嘉航郭春义赵瑞斌许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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