Hybrid DC (direct current) electric power transmission system

A DC transmission system and hybrid technology, applied in two-wire DC circuits, power transmission AC networks, etc., can solve the problems of affecting voltage and current balance, reducing the reliability of converters, and high switching frequency of devices, eliminating the need for switching. Phase failure, reducing the number of fully controlled devices, and promoting the effect of grid connection

Inactive Publication Date: 2011-11-02
ZHEJIANG UNIV
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Problems solved by technology

However, the dispersion of power electronic devices in terms of volt-ampere characteristics, turn-on time, and recovery charge affects their voltage and current balance when they are connected in series and parallel, resulting in a decrease in the reliability of the converter; Very high, high loss, still need to configure a high-pass filter with a certain capacity to filter out high-frequency components

Method used

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  • Hybrid DC (direct current) electric power transmission system
  • Hybrid DC (direct current) electric power transmission system
  • Hybrid DC (direct current) electric power transmission system

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Embodiment Construction

[0033] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Such as figure 1 As shown, a hybrid direct current transmission system includes: passive filter 1, rectifier converter transformer 2, twelve-pulse bridge thyristor converter 3, smoothing reactor 4, direct current transmission line 5, modular multiple A level converter 6 and an inverse converter transformer 7 .

[0035] The passive filter 1 is connected in parallel on the incoming high-voltage three-phase bus of the AC system at the sending end. The specific type, capacity, number of groups and tuning points are determined according to the specific system engineering conditions. Generally, a double-tuned filter and a parallel capacitor phase can be used. Cooperate to filter out the characteristic subharmonic current generated...

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Abstract

The invention discloses a hybrid DC (direct current) electric power transmission system comprising a passive filter, a rectifier converter transformer, a thyristor converter, a flat wave reactor, a DC electric power line, a multi-level converter and an inverse converter transformer. A twelve-pulse bridge converter based on a thyristor is arranged at a sending-end rectifier side, and a modularized multi-level converter is arranged at a receiving-end inverter side, thus eliminating the phase conversion failure of the traditional DC electric power transmission system fundamentally and being suitable for supplying power for multi-DC droppoint areas, passive networks or weak alternating current systems and other occasions. Compared with a light-type high-voltage DC electric transmission system, the hybrid DC electric power transmission system provided by the invention has the advantages that the number of expensive full-control devices is greatly decreased, the cost is reduced, the loss is reduced, the reliability is high, the control is flexible, and fewer reactive compensation devices are used. In addition, the hybrid DC electric power transmission system provided by the invention can be used as a black start power supply of a receiving-end alternating current system and is good in engineering application value.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission, and in particular relates to a hybrid direct current transmission system. Background technique [0002] The traditional high-voltage direct current transmission system uses a thyristor-based converter, which has the advantages of low cost, low loss, and high reliability. It has nearly 40 years of reliable operation in large-capacity long-distance power transmission, asynchronous grid interconnection, and submarine cable power transmission. experience. However, since the thyristor is a semi-controlled device and uses grid commutation, commutation failure is prone to occur on the inverter side, especially the failure of the AC system in a multi-DC drop point area may cause multiple converter stations to fail commutation at the same time, causing huge damage to the AC system. The impact seriously affects the stable and safe operation of the system; at the same time, for p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/06H02J3/36
CPCY02E60/60
Inventor 徐政薛英林管敏渊屠卿瑞
Owner ZHEJIANG UNIV
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