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DC line power flow controller and control method

A technology of power flow controller and DC line, which is applied in the direction of power transmission AC network, emergency protection circuit device, and AC network with the same frequency from different sources, etc. It can solve the problems of unrecognizable DC line faults and insufficient freedom of power flow control, etc.

Pending Publication Date: 2020-10-20
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, an additional power flow controller is often used to solve the problem of insufficient freedom of power flow control in the DC power grid, but the existing power flow controller does not integrate the DC fault, and cannot identify the fault of the DC line and block it

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  • DC line power flow controller and control method
  • DC line power flow controller and control method
  • DC line power flow controller and control method

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Embodiment Construction

[0062] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0064] The present invention provides a DC line power flow controller, such as figure 1 As shown, the DC line power flow controller includes: a power flow regulating unit, a blocking u...

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Abstract

The invention relates to a DC line power flow controller and a control method. The DC line power flow controller comprises a power flow adjusting unit, a blocking unit, a first control unit and a second control unit, and the power flow adjusting unit and the blocking unit are connected in series. The first control unit is used for generating a control signal of the power flow adjusting unit according to the voltage and the current of a direct-current line and controlling the power flow adjusting unit to be switched on or switched off by utilizing the control signal. The second control unit isused for switching on or switching off the blocking unit according to the current of the direct-current line. Two functions of DC line power flow control and DC fault blocking are fused and integrated, and the control flexibility and reliability of the DC power transmission system are improved.

Description

technical field [0001] The invention relates to the technical field of DC converters, in particular to a DC line power flow controller and a control method. Background technique [0002] DC transmission technology has the advantages of low unit cost and loss, high transmission capacity, and small line footprint, and is especially suitable for ultra-large-scale ultra-long-distance power transmission. The DC power grid is one of the development trends of the future smart grid form. It can realize wide-area balance and interconnection of various types of renewable energy supply and demand, large-scale grid connection and transmission of renewable energy, increase system reliability and flexibility, and reduce system backup. Capacity, reducing the cost of grid construction, will bring revolutionary changes to the efficient use of energy. [0003] There may be multiple transmission lines between two converter stations in the DC power grid, and the line flow will be naturally dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/36H02H7/26
CPCH02J3/06H02J3/36H02H7/268H02J2203/10Y02E60/60
Inventor 曹远志杨波卢俊峰姚良忠
Owner CHINA ELECTRIC POWER RES INST