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A MMC converter system and its fault-tolerant control method

A fault-tolerant control and control method technology, applied in the direction of AC power input conversion to DC power output, power transmission AC network, AC network voltage adjustment, etc. The effect of filling gaps in the industry and improving reliability

Active Publication Date: 2018-10-19
STATE GRID CORP OF CHINA +5
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide an MMC converter system and its fault-tolerant control method to solve the problem of low capacity level of the traditional flexible converter system

Method used

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  • A MMC converter system and its fault-tolerant control method
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  • A MMC converter system and its fault-tolerant control method

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] figure 1 The topology of the matrix flexible converter system based on the sub-module hybrid MMC converter unit is given. The topology includes m×n sub-module hybrid MMC converter units. The m×n MMC converter units constitute A matrix, the matrix units in the matrix are MMC converters. Among them, m represents the number of matrix rows of the matrix commutation system, that is, the number of MMC units connected in series, m determines the DC voltage level of the matrix commutation system; n represents the number of matrix columns of the matrix commutation system, that is, the number of MMC unit strings The number of parallel connections, n determines the DC current level of the matrix converter system; m and n together determine the capacity of the matrix converter system.

[0038] In order to facilitate fault-tolerant control, each bridge arm in eac...

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Abstract

The invention relates to an MMC converting system and a fault-tolerant control method thereof. The converting system comprises m*n MMC converting units which form an m*n-order matrix, wherein each MMC converting unit is one matrix unit in the matrix, the matrix units in the same column are connected sequentially, and the matrix units in the same line are connected sequentially; at least one full-bridge sub-module is arranged on each bridge arm in each MMC converting unit. The MMC converting system is divided into three layers for fault-tolerant control, the first-layer control is matrix unit fault-tolerant control, the second-layer control is matrix line fault-tolerant control, and the third-layer control is matrix column fault-tolerant control; by means of the fault-tolerant control on three levels including the matrix units, the matrix lines and the matrix columns, cross-redundant fault-tolerant control of the flexible converting system is realized, the industrial blank is filled up, the reliability of the high-voltage high-capacity flexible converting system is improved greatly, and industrial promotion is facilitated.

Description

technical field [0001] The invention relates to an MMC commutation system and a fault-tolerant control method thereof. Background technique [0002] At present, the traditional HVDC transmission system (also known as grid commutated converter HVDC transmission system, LineCommutated Converter Based High Voltage Direct Current, LCC-HVDC) has been widely used due to its mature technology, high transmission capacity, fast controllable active power and other advantages. application. However, the LCC-HVDC system has defects such as the commutation failure of the inverter station, the inability to supply power to the weak AC system, and the need to consume a large amount of reactive power during operation, which restricts its development to a certain extent. [0003] With the development of electric power technology, the voltage source converter based high voltage direct current transmission (Voltage Source Converter Based High Voltage Direct Current, VSC-HVDC) based on fully con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/16H02M7/5387
CPCH02J3/16H02J3/36H02M7/5387Y02E40/30Y02E60/60
Inventor 吴金龙江伟杨杰刘欣和王先为姚为正祁招屈路军
Owner STATE GRID CORP OF CHINA
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