Mixed MMC-based mixed direct current power transmission system

A technology of DC transmission system and DC transmission line, which is applied in the direction of converting AC power input to DC power output, electrical components, power transmission AC network, etc. It can solve problems such as DC voltage drop, reduce the number of uses, and reduce investment costs Effect
CN103701145AInactive Publication Date: 2014-04-02ZHEJIANG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2014-04-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a mixed MMC-based mixed direct current power transmission system, comprising a rectifying converter station and an inversion converter station, wherein the inversion converter station adopts a mixed MMC. The direct current power transmission system has the active and reactive decoupling control capacity, can transmit power to a reactive network without the phase change failure risk and has direct current fault self-cleaning capacity; under the condition that a feeding end alternating current system has a fault; the mixed MMC has the capacity of outputting a negative level by using a full-bridge submodule, the direct current voltage output by the system can be reduced under the premise of ensuring the controllability and stability of the system, the direct current voltage can be matched with the direct current voltage of a rectifying station, and the direct current power is maintained to be continuously transmitted; due to the optimization on the number of two types of submodules in the mixed MMC, the use number of power electronic components is greatly reduced and the investment cost is reduced under the condition that the mixed modularized multi-level converter meets the stable and transient operation demands of the direct current system.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics, and in particular relates to a hybrid direct current transmission system based on a hybrid MMC. Background technique

[0002] The traditional high-voltage direct current transmission system (LCC-HVDC) based on LCC (grid commutated converter) has the advantages of low cost, low loss, and high reliability. It has been used in submarine cable power transmission, large-capacity long-distance power transmission, and asynchronous grid interconnection. and other occasions have been widely used. However, there is a risk of commutation failure on the inverter side of LCC-HVDC, and it is not suitable for power transmission to weak AC systems or passive networks, which limits its further development.

[0003] The HVDC transmission system composed of two-level VSC (voltage source converter based on fully-controlled power electronic devices) or modular multi-level converter (MMC) has independent co...

Claims

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