Method and device for acquiring impedance model of direct-driven wind power plant through LCC-HVDC sending-out system

A technology of LCC-HVDC and impedance model, which is applied in circuit devices, wind power generation, electrical components, etc., can solve problems such as impedance acquisition without an effective solution, and achieve inaccurate model acquisition and accurate and comprehensive impedance model , easy-to-operate effect

Pending Publication Date: 2021-12-03
BEIJING INSTITUTE OF TECHNOLOGYGY +5
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Problems solved by technology

However, no effective solution has been proposed for the impedance acquisition of the direct drive wind farm through the LCC-HVDC transmission project

Method used

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  • Method and device for acquiring impedance model of direct-driven wind power plant through LCC-HVDC sending-out system
  • Method and device for acquiring impedance model of direct-driven wind power plant through LCC-HVDC sending-out system
  • Method and device for acquiring impedance model of direct-driven wind power plant through LCC-HVDC sending-out system

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Embodiment Construction

[0042] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0043] The method and device for obtaining the impedance model of the direct drive wind farm sending system via LCC-HVDC proposed by the embodiment of the present invention can accurately obtain the positive sequence impedance and coupling impedance of the direct drive wind farm sending system via LCC-HVDC in the full frequency band , considering the sub-synchronous and super-synchronous coupling relations, the obtained impedance model is more accurate and comprehensive, and it is more accurate and effective to analyze the system stability, making up for the current research on the model acquisition in the stability analysis of the direct-drive wind farm through the LCC-HVDC transmission system The lack of inaccuracy in various aspects provides an important basis for the design and grid connection of the direct drive wind farm through the LCC-HVDC transmiss...

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Abstract

The invention discloses a method and device for acquiring the impedance of a direct-driven wind power plant through an LCC-HVDC sending-out system. The impedance of the system can be accurately acquired, so that a model basis is provided for stability analysis and optimization of the sending-out system. The sub-synchronous and super-synchronous coupling relation is considered, the positive sequence impedance and the coupling impedance of the direct-driven wind power plant, the alternating current power grid and an LCC-HVDC sending end system are obtained through an obtaining module, a collecting module and a calculating module, the impedance of the whole direct-driven wind power plant in the full frequency band through the LCC-HVDC sending end system is obtained through calculation, and therefore the stability of the system is accurately analyzed. The device is easy to operate, the sub-synchronous coupling relation and the super-synchronous coupling relation are considered, the positive sequence impedance and the coupling impedance of the direct-driven wind power plant in the full frequency band through the LCC-HVDC sending-out system can be accurately obtained, the obtained impedance model is more accurate and comprehensive, and the method is more accurate and effective when being used for analyzing the stability of the system.

Description

technical field [0001] The invention belongs to the technical field of direct-current high-voltage transmission systems, and in particular relates to a method and a device for acquiring an impedance model of a direct-drive wind farm transmission system through an LCC-HVDC. Background technique [0002] my country's wind power is developing rapidly, and its installed capacity is increasing year by year. However, the geographical distribution of wind resources and electricity load centers is reversed, resulting in a significant imbalance between the supply side of wind power generation and the demand side of electricity consumption. The "long-distance, large-scale, high-concentration" wind power transmission construction has become the main way of wind power development and utilization in my country at present and for a considerable period of time in the future. The traditional LCC-HVDC power transmission technology occupies a dominant position in the current and future HVDC ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/36H02J3/18
CPCH02J3/381H02J3/36H02J3/18H02J2003/365H02J2203/20H02J2300/28Y02E10/76Y02E40/30Y02E60/60
Inventor 李震江长明董晓亮皮俊波田旭姜文罗永志王艳辉
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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