Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability

A DC power transmission system, DC fault ride-through technology, applied in the direction of AC power input conversion to AC power output, AC power input conversion to DC power output, AC network circuits, etc., can solve problems such as restricting applications, and achieve good output waveform quality , reduce loss, and occupy a small area

Active Publication Date: 2015-12-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the shortcomings of MMC-HVDC restrict its application in the field of industrial power transmission to a certain extent.

Method used

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  • Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability
  • Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability
  • Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability

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Embodiment Construction

[0036] 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.

[0037] Such as figure 1 As shown, the series hybrid bipolar DC transmission system with DC fault ride-through capability of the present invention includes: a rectifier station and an inverter station, both of which are connected through a DC transmission line, wherein:

[0038] Both the positive pole and the negative pole of the rectifier station and the inverter station are composed of a thyristor converter (LCC) and a modular converter in series, where the modular converter adopts one or more modular multilevel converters (MMC) parallel composition;

[0039] There are passive filters connected to the three-phase bus of the AC power grid at the sending end and the receiving end. The specific type, capacity, number of groups and tu...

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Abstract

The invention discloses a series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability. The series hybrid bipolar direct-current transmission system comprises a rectifier station and an inverter station, wherein the rectifier station is connected with the inverter station through a direct-current transmission line; positive electrodes and negative electrodes of the rectifier station and the inverter station are formed by connecting thyristor converters and modular converters in series; and each modular converter is formed by connecting one or more modular multilevel converters in parallel. The series hybrid bipolar direct-current transmission system has the advantages of low construction cost, low loss, high reliability and the like of the traditional thyristor converters, and has the advantages of flexible control, low harmonic wave, active and reactive power decoupling control, voltage support capacity on an alternating-current system access point and the like of the modular multilevel converters; the system is divided into the positive electrode and the negative electrode; the operation reliability is enhanced; and a direct-current fault can be removed by the actions of the converters under various faults. Therefore, the series hybrid bipolar direct-current transmission system is suitable for high-voltage direct-current transmission occasions of a remote high-capacity overhead line, has a wide development space and is worthy of strong popularization.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission, and in particular relates to a series hybrid bipolar direct current transmission system with direct current fault ride-through capability. Background technique [0002] With the development of electric power science and technology, the cost of the traditional high-voltage direct current transmission system (LCC-HVDC) based on thyristor converters has been reduced year by year, the reliability of power transmission has been continuously improved, and the loss in the station has gradually decreased. At present, the traditional HVDC power transmission system based on thyristor converters has been widely used in large-capacity long-distance power transmission, island power transmission, and back-to-back interconnection of asynchronous grids. However, the traditional HVDC power transmission system based on the thyristor converter has the following three main defects: (1) The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02M7/7575H02J2003/365Y02E60/60H02M5/4585H02M1/325H02M7/4835H02M1/0095
Inventor 徐政王世佳肖晃庆
Owner ZHEJIANG UNIV
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