A Comprehensive Sensor Fault Diagnosis and Ride-Through Method for Modular Multilevel Converter

A modular multi-level, sensor fault technology, applied in the direction of measuring electrical variables, converting AC power input to DC power output, instruments, etc., can solve the problems of fault diagnosis and fault ride-through without MMC sensors, and achieve short diagnosis time, Rapid diagnosis and cost-saving effects

Active Publication Date: 2022-04-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] At present, the sensor diagnosis and ride-through technology for power electronic converters is still limited to the traditional bridge topology. At present, there is no diagnosis and fault ride-through for sensor faults in the MMC topology. Therefore, a comprehensive MMC sensor is proposed. Diagnosis and traversal methods, with some significance

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  • A Comprehensive Sensor Fault Diagnosis and Ride-Through Method for Modular Multilevel Converter
  • A Comprehensive Sensor Fault Diagnosis and Ride-Through Method for Modular Multilevel Converter
  • A Comprehensive Sensor Fault Diagnosis and Ride-Through Method for Modular Multilevel Converter

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It is obvious that those skilled in the art can easily make various modifications to the above embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention should fall within the protection scope of the present invention.

[0029] This embodiment provides a method for locating submodule faults of modular multilevel converters based on correlation analysis, including the following steps:

[0030] (1) Establish a sensor feedback system under normal operating conditions according to the MMC topology;

[0031] (2) Diagnose the fault location of the current sensor on the AC side and perform fault ride-through; ...

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Abstract

The invention belongs to the technical field of fault diagnosis and fault ride-through of power electronic equipment, and relates to a sensor fault comprehensive diagnosis and ride-through method of a modular multilevel converter, which detects and faults by comparing the measured value of the current sensor on the AC output side with the reference value of the output current. Locate the fault of the current sensor on the AC output side; detect and locate the fault of the current sensor of the bridge arm by comparing the switch state of the previous control cycle, the charging and discharging of the sub-module capacitor, and the measured value of the bridge arm current sensor; The differential value of the module voltage sensor is used to detect and locate the failure of the sub-module voltage sensor. The invention realizes the fault diagnosis and fault ride-through of MMC sensors, realizes fast and accurate detection and positioning of multi-sensors and multi-type sensors on the basis of not increasing the original MMC topological structure, and can complete multi-sensors and multi-type sensors at the same time Fault ride through, so that MMC can run smoothly for a long time even in the state of sensor failure.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis and fault ride-through of power electronic equipment, and in particular relates to a comprehensive diagnosis and ride-through method for voltage and current sensor faults of a modular multilevel converter. Background technique [0002] Modular multilevel converters have been more and more widely used in high voltage and large transmission capacity occasions in recent years because of their advantages such as modular design, strong scalability, low operating loss, and high output waveform. Due to the large number of voltage and current sensors used, MMC sensor fault diagnosis and fault ride-through technology can improve the reliability and safety of its operation. [0003] At present, the sensor diagnosis and ride-through technology for power electronic converters is still limited to the traditional bridge topology. At present, there is no diagnosis and fault ride-through for sensor faults...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/32G01R31/00
Inventor 张莉王连强熊永圣
Owner DALIAN UNIV OF TECH
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