Fault diagnosis method of modular multilevel inverter based on state observation

A modular multi-level, fault diagnosis technology, applied in the direction of measuring electrical variables, measuring electricity, fault location, etc., can solve the problems of increasing the complexity of the algorithm, not being able to specifically determine the fault switching device, and affecting the use effect

Active Publication Date: 2015-09-30
SOUTHEAST UNIV
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Problems solved by technology

[0006] However, although the above several fault diagnosis methods can all have the function of MMC fault diagnosis, they all have their own defects.
For example, in the synovium observer method, multiple physical quantities need to be observed and compared, which increases the complexity of the algorithm; while in the Kalman filter method, although there is only one physical quantity to be obse

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  • Fault diagnosis method of modular multilevel inverter based on state observation
  • Fault diagnosis method of modular multilevel inverter based on state observation
  • Fault diagnosis method of modular multilevel inverter based on state observation

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[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] In order to illustrate the working principle of this fault diagnosis method, here, the MMC single-phase upper and lower bridge arms are cascaded with n sub-modules, and in the fault assumption, it is assumed that the upper switching device in each sub-module fails as an example , combined with the working principle of the extended state observer to illustrate the working process of the observer module. It should be noted that this fault diagnosis method is for all sub-modules in one phase, so the fault diagnosis method for the remaining phases of the multi-phase MMC and the lower switching devices in the sub-modules is the same as this phase.

[0047] Firstly, the measured upper arm current i in the single phase P , lower arm current i N and the DC side voltage E are input to the extended state observer to obtain the tracking value of ...

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Abstract

The invention discloses a novel fault diagnosis method of a modular multilevel inverter based on extended state observation. In the stage of fault detection, an extended state variable observed value which is magnified and filtered is compared with an extended state variable calculated value which is filtered in a hypothetical normal working condition by an output matching module, and whether the modular multilevel inverter has faults is determined according to comparative results; in the stage of determining fault positions, extended state variable calculated values which are filtered in hypothetical fault positions are respectively compared with the extended state variable observed value which is output by an observer module and is magnified and filtered by the output matching module, and the fault positions of the modular multilevel inverter are determined according to comparative results. The novel fault diagnosis method aims to determine whether the modular multilevel inverter has the faults by utilizing an extended state observer and reversed switch state variables, and if the faults occur, the fault positions can be quickly and accurately determined.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of modular multilevel inverters, and in particular relates to a novel fault diagnosis method for modular multilevel inverters based on state observation. Background technique [0002] A Modular Multilevel Converter (MMC for short) is a kind of multilevel converter emerging in recent years. The structure of the modular multilevel inverter was first proposed by Professor R. Marquardt in 2001. Compared with the traditional multilevel inverter structure, the outstanding advantages of MMC include: 1) High modularity, making this The inverter can realize the application of any voltage level by cascading modules; 2) The harmonic characteristics are good, due to the cascading of the same module, the number of levels is large, and the AC output side does not need to use a filter; 3) Redundancy and fault tolerance Strong capability, the internal structure of each module is the same, when a large number of mo...

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Application Information

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IPC IPC(8): G01R31/00G01R31/08
Inventor 张建忠胡省徐帅姜永将
Owner SOUTHEAST UNIV
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