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A method for calculating the input number of mmc and sub-modules, input method and device

A technology of seed module and calculation method, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of low utilization rate of redundant sub-modules, reduce electrical stress, improve The effect of reliability

Active Publication Date: 2020-07-21
XUJI GRP +3
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for calculating the input number of MMC, sub-modules, input method and device, which are used to solve the problem of low utilization rate of redundant sub-modules

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  • A method for calculating the input number of mmc and sub-modules, input method and device
  • A method for calculating the input number of mmc and sub-modules, input method and device

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] MMC embodiment:

[0038] This embodiment provides a kind of MMC, its circuit schematic diagram is as follows figure 1 As shown, the MMC line is included, and the MMC line includes six bridge arms, and every two bridge arms are connected in series, respectively connected to the three phases a, b, and c. Each bridge arm is provided with n sub-modules, respectively denoted as SM 1 , SM 2 ,...,SM n , there are m redundant submodules in n submodules. Since the method for controlling the sub-modules on each bridge arm of the MMC will be described in detail in the following embodiments of the method for calculating the number of sub-modules input and the embodiment of the method for controlling the input of sub-modules, no further deta...

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Abstract

The invention relates to an MMC, a sub-module input number calculation method and an input method and device. The sub-module input number calculation method comprises a step of counting the number offault sub-modules on one bridge arm, a step of calculating and obtaining the modulation voltage Vn=Vd / [2(n-k)] of each sub-module on the bridge arm according to DC bus voltage, the total number of sub-modules on the bridge arm and the number of the fault sub-modules when the number of the fault sub-modules on the bridge arm is smaller than or equal to the number of redundant sub-modules, wherein Vd is the DC bus voltage, Vn is the modulation voltage of each sub-module on the bridge arm, n is the total number of the sub-modules on the bridge arm, and k is the number of the fault sub-modules, and a step of calculating the ratio of the modulation voltage of the bridge arm to the modulation voltage of each sub-module on the bridge arm to obtain the number of inputted bridge arm sub-modules. Byreducing the modulation voltage of each sub-module, more redundant sub-modules participate in the bridge arm voltage modulation, and the reliability of a flexible DC transmission commutation system is improved.

Description

technical field [0001] The invention relates to a method for calculating the input number of MMC and sub-modules, an input method and a device, and belongs to the technical field of flexible direct current transmission of electric power systems. Background technique [0002] Modular multilevel flexible direct current transmission (MMC-HVDC) is a new generation of direct current transmission technology, and flexible direct current transmission is a direct current transmission based on a voltage source. The voltage polarity of the direct current line is unchanged, so it is very easy to form a multi-terminal direct current Power transmission, which can directly supply power to small isolated loads over long distances, especially passive systems. [0003] The flexible HVDC converter valve is composed of 6 bridge arms, and each bridge arm contains several redundant sub-modules. When the system is running, the rated voltage (also called modulation voltage) of the sub-modules remai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00
CPCH02M7/00
Inventor 胡四全宣佳卓董朝阳俎立峰王朝亮丁超吉攀攀赵洋洋秦鸿瑜慕小乐王晓丽樊大帅樊宏伟周航裴杰才
Owner XUJI GRP
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