Hybrid direct-current transmission system, control method and power reversal control method

A power transmission system and hybrid DC technology, applied in power transmission and AC networks, etc., can solve the problems of inability to change the polarity of the DC voltage, incapable of making full use of the converter, and inability to change the current direction, achieving low loss, high reliability, less dependent effect
CN104852401AActive Publication Date: 2015-08-19NR ELECTRIC CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NR ELECTRIC CO LTD
Publication Date
2015-08-19

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Abstract

The invention discloses a hybrid direct-current transmission system. A first group of thyristor converter units and a second group of thyristor converter units are connected with the same sending end alternating-current power grid through a converter respectively, or connected with different sending end alternating-current power grids. An inversion converter station is composed of at least one group of voltage source converters, direct-current lines at the positive and negative ends of each voltage source converter are respectively equipped with a first switching element and a fourth switching element, and the direct-current lines at the positive and negative ends are wired in parallel and in a cross manner to the opposite-end direct-current lines through the first switching element and the fourth switching element respectively. Converter stations at the two ends are connected by two direct-current lines. The invention further discloses a hybrid direct-current transmission system control method and a hybrid direct-current transmission system power reversal control method. The hybrid direct-current transmission system of the invention has the advantages of low cost of traditional direct current, flexible control on flexible direct current, and the like.
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Description

technical field

[0001] The invention relates to the field of hybrid direct current transmission, in particular to a hybrid direct current transmission system, a control method and a power flow reversal control method. Background technique

[0002] HVDC transmission systems can be divided into two types: traditional DC transmission systems (LCC-HVDC) based on thyristor technology; flexible HVDC systems based on fully controlled power electronic device technology (Flexible-HVDC). The traditional direct current transmission system (LCC-HVDC) has low cost, low loss, and mature operation technology. At present, almost all the operating direct current transmission systems in the world are LCC-HVDC systems, but the traditional direct current transmission system (LCC-HVDC) has inverter It is prone to commutation failure, strong dependence on the AC system, absorbs a large amount of reactive power, and the converter station occupies a large area. The new generation of flexible direc...

Claims

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