MMC maintenance period determination method and system based on sub-module state monitoring
A technology for determining the maintenance cycle and method, which is applied in the field of power conversion and transmission, and can solve problems such as unreliable maintenance cycle
Active Publication Date: 2020-07-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0006] The purpose of the present invention is to provide a method and system for determining the MMC maintenance cycle based on sub-module status monitoring, which can solve the problem of unreliable maintenance cycle
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[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0067] The purpose of the present invention is to provide a method and system for determining the MMC maintenance cycle based on sub-module state monitoring, which can solve the problem of unreliable maintenance cycle.
[0068] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodime...
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The invention relates to an MMC maintenance period determination method and system based on sub-module state monitoring. The method comprises the following steps: determining the fault rate of a firstsub-module and the number of first fault sub-modules according to a preset maintenance period, the number of sub-modules and a preset sub-module fault probability density, and determining a first correction sub-module fault probability density according to the data and the number of first actual fault sub-modules; determining corresponding second data according to the method; determining the fault rate of the current sub-module according to the reliability index; then determining a current maintenance period; performing maintenance according to the current maintenance period to obtain the number of current actual fault sub-modules; determining the number of currently estimated fault sub-modules; and finally, determining the fault probability density of the sub-modules in the next period;updating the current sub-module fault probability density to the current sub-module fault probability density, returning to re-determine the fault rate of the current sub-module, and adjusting the maintenance period of the next period. Through the method, the problem of unreliable maintenance period can be solved.
Description
technical field [0001] The invention relates to the technical field of power conversion and transmission, in particular to a method and system for determining an MMC maintenance period based on submodule status monitoring. Background technique [0002] In recent years, the modular multilevel converter (MMC) has been widely used in HVDC transmission systems. Its main circuit is composed of three phase units a, b and c, and each phase unit has It is composed of upper and lower bridge arms, each of which is composed of a certain number of sub-modules in series, and several redundant sub-modules are set in each bridge arm, such as figure 2 As shown, the MMC can operate normally only when the sub-modules of each bridge arm working normally are not lower than a certain value. In order to ensure the operational reliability of the MMC and reduce the probability of failure, it is necessary to maintain the MMC. Most of the existing maintenance methods are based on a constant sub-mod...
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IPC IPC(8): H02M1/32H02M7/00H02J3/36G06Q10/00G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q10/20G06Q50/06H02J3/36H02M1/32H02M7/00H02M1/0067Y02E60/60
Inventor 袁敞邱俊卿戴笃猛陈璐
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)