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Comprehensive diagnosis method for open circuit fault of power tube of three-phase three-wire inverter with two current sensors and current sensor fault

A current sensor, three-phase three-wire technology, which is applied in the field of comprehensive diagnosis of three-phase three-wire inverter power tube open circuit fault and current sensor fault, to achieve the effect of small calculation, short diagnosis time and fast diagnosis

Active Publication Date: 2019-11-08
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] It can be seen that in the three-phase three-wire inverter with two current sensors, there is no method to realize the comprehensive diagnosis of power tube open circuit fault and current sensor fault at the same time

Method used

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  • Comprehensive diagnosis method for open circuit fault of power tube of three-phase three-wire inverter with two current sensors and current sensor fault
  • Comprehensive diagnosis method for open circuit fault of power tube of three-phase three-wire inverter with two current sensors and current sensor fault
  • Comprehensive diagnosis method for open circuit fault of power tube of three-phase three-wire inverter with two current sensors and current sensor fault

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Embodiment Construction

[0045] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] Such as figure 1 As shown, the three-phase three-wire inverter topology with two current sensors of the present invention and the comprehensive diagnosis method for power tube open circuit fault and current sensor fault include the following steps:

[0047] S1. Obtain electrical information for diagnostics from a three-phase three-wire inverter system with two current sensors

[0048] In a three-phase three-wire inverter with two current sensors, the output phase current (i A i B ), output phase voltage (v AO , v BO , v CO ), DC bus voltage (v dc ) is collected and sent to the control system to realize functions such as closed-loop operation and protection; the controller calculates and obtains the pulse driving signal of each phase bridge arm ...

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Abstract

The invention discloses a comprehensive diagnosis method for an open circuit fault of a power tube of a three-phase three-wire inverter with two current sensors and a current sensor fault. According to the method, the output line voltage deviation and the output phase voltage deviation are used as diagnostic variables at the same time, and the faults are detected and located through two characteristic combinations of the diagnostic variables. The method realizes comprehensive diagnosis of the open circuit fault of the power tube of the three-phase three-wire inverter with the two current sensors and the current sensor fault for the first time, only existing information in a control system needs to be controlled, the calculation amount is small, the two faults can be quickly and accuratelydiagnosed without adding additional sampling and hardware circuits, and the method has the advantage of high practicability.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of power electronic equipment, and in particular relates to a method for comprehensively diagnosing the open circuit fault of a power tube of a three-phase three-wire inverter with two current sensors and the fault of the current sensor. Background technique [0002] Inverters have been widely researched and applied in the fields of new energy grid connection and uninterruptible power supply. Inverters play a key role in controlling and transmitting electric energy, but inverters are also the equipment with the highest failure rate. The unexpected occurrence of inverter failure can lead to huge losses. Fast and accurate fault diagnosis of the inverter is helpful to improve the availability of the inverter, protect the system in time and reduce the maintenance time, so it is of great significance. In inverters, power tube open circuit faults and current sensor faults are common faults. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01R31/26G01R31/02
CPCG01R31/2601G01R35/00
Inventor 马皓李战
Owner ZHEJIANG UNIV
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