Sensor fault comprehensive diagnosis and ride-through method of 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 stable operation, Fast diagnosis, cost saving effect

Active Publication Date: 2021-04-20
DALIAN UNIV OF TECH
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  • Application Information

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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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  • Sensor fault comprehensive diagnosis and ride-through method of modular multilevel converter
  • Sensor fault comprehensive diagnosis and ride-through method of modular multilevel converter
  • Sensor fault comprehensive diagnosis and ride-through method of 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-mentioned embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the present invention is not limited to the above 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 power electronic equipment fault diagnosis and fault ride-through, and relates to a sensor fault comprehensive diagnosis and ride-through method of a modular multilevel converter. The method comprises the following steps: detecting and locating the fault of an alternating current output side current sensor by comparing the measured value of the alternating current output side current sensor with an output current reference value; detecting and positioning the fault of the bridge arm current sensor by comparing the switching state of the previous control period, the charging and discharging condition of the sub-module capacitor and the measured value of the bridge arm current sensor; and detecting and positioning faults of the sub-module voltage sensors by comparing difference values of the different sub-module voltage sensors on the same bridge arm. Fault diagnosis and fault ride-through of the MMC sensor are realized, rapid and accurate detection and positioning of multiple sensors and multiple types of sensors are realized on the basis of not increasing the original MMC topological structure, and fault ride-through of the multiple sensors and the multiple types of sensors can be completed at the same time, so that the MMC can operate stably for a long time in a sensor fault state.

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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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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