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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

Inactive Publication Date: 2015-07-08
ZHEJIANG UNIV +1
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Problems solved by technology

[0005] However, these hybrid topologies currently proposed ignore a problem: when the AC system at the sending end where the LCC is located fails, especially a serious ground fault, the DC voltage output by the LCC will drop with the AC voltage
The power interruption time is the same as the AC system failure time, which is more harmful than commutation failure

Method used

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  • Mixed MMC-based mixed direct current power transmission system
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  • Mixed MMC-based mixed direct current power transmission system

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Embodiment Construction

[0047] 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.

[0048] Such as figure 1 As shown, a hybrid DC transmission system based on hybrid MMC includes a rectifier converter station connected to the AC system at the sending end and an inverter converter station connected to the AC system at the receiving end. Both the rectification converter station and the inverter conversion station include an AC busbar and a converter unit, and the converter unit is connected to the AC busbar through a converter transformer. An AC filter and a reactive power compensator are connected to the AC busbar of the rectifier station. They are respectively used to filter the harmonics generated by the rectification converter station and compensate the reactive power demand of the rectification converter statio...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M7/5387
CPCY02E60/60
Inventor 徐政许烽唐庚刘高任刘昇薛英林吴琛李玲芳张丹张杰
Owner ZHEJIANG UNIV
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