Modular multilevel converter robust fault detection method based on sliding mode observer

A modular multi-level, sliding-mode observer technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as failure to timely and effectively analyze failures and their causes, and failure to provide sufficient system failure information.

Inactive Publication Date: 2020-06-19
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional diagnostic methods cannot provide sufficient information about system faults, and cannot analyze the faults and their causes in a timely and effective manner after a system fault occurs

Method used

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  • Modular multilevel converter robust fault detection method based on sliding mode observer
  • Modular multilevel converter robust fault detection method based on sliding mode observer
  • Modular multilevel converter robust fault detection method based on sliding mode observer

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Embodiment Construction

[0047] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0048] The modular multilevel converter comprises three identical single-phase MMC equivalent circuit phase units, and each of the single-phase MMC equivalent circuit phase units includes upper and lower bridge arms, each bridge arm It is composed of N sub-modules with the same structure, a bridge arm inductance L and a bridge arm equivalent resistance R in series. Each sub-module includes a half-bridge structure composed of two IGBTs with anti-parallel diodes and a capacitor C. The method includes the following step:

[0049] Step 1. Obtain the output voltage u of the AC side of the phase unit during operation of the single-phase MMC equivalent circuit o and current i o , the voltage u of the upper bridge arm u ...

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Abstract

The invention relates to a modular multilevel converter robust fault detection method based on a sliding mode observer. The modular multi-level converter comprises three same single-phase MMC equivalent circuit phase units; each single-phase MMC equivalent circuit phase unit comprises an upper bridge arm and a lower bridge arm; each bridge arm is formed by connecting N sub-modules with the same structure, a bridge arm inductor L and a bridge arm equivalent resistor R in series; and each sub-module comprises a half-bridge structure composed of two IGBTs with antiparallel diodes and a capacitorC. According to the method, the sliding mode observer is adopted, and based on a state space model, equivalent output error injection and other technologies, multi-level converter fault information reconstruction is realized; when a fault occurs, the system can still keep sliding mode motion, detection and isolation of the fault of the multilevel converter are achieved, and the problems that a traditional diagnosis method cannot provide enough system fault information, and after the fault occurs in the multilevel converter system, the fault and reasons of the fault cannot be effectively analyzed in time are solved.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission of power systems, and in particular relates to a robust fault detection method for a modular multilevel converter based on a sliding mode observer. Background technique [0002] With the development of power electronics technology, flexible direct current transmission technology is developing towards higher voltage and greater power transmission capacity. As a new type of voltage source converter, modular multilevel converter (MMC) The development of flexible DC power transmission has the advantages of low manufacturing difficulty, low loss and high output waveform quality. MMCs are also used for modular hardware concepts, transformerless operation, common DC voltage bus and scalability to meet high power and high voltage levels, has proven to be an efficient solution for these applications. [0003] Common MMC faults include power device faults, capacitor faults, control circu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54G01R31/56G06F30/20
Inventor 张永成晓斌刘振兴蔡彬赵敏张雄希
Owner WUHAN UNIV OF SCI & TECH
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