Self-detecting and self-correcting system and method of frequency converter, and frequency converter
A frequency converter and self-inspection technology, applied in the field of frequency converter, can solve problems such as control abnormality, absolute accuracy cannot be guaranteed, and sensor installation reversed
Active Publication Date: 2019-10-08
SIEMENS ELECTRICAL DRIVES SHANGHAI
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Problems solved by technology
After the inverter is assembled for the first time or the components are replaced, the sensor may be installed reversely, and the unit power device and capacitor may also be abnormal, which will cause the inverter to fail to start and run normally.
[0003] When the inverter is not started, each component can be manually detected and visually inspected after installation, but it takes a long time and cannot guarantee the absolute accuracy
When the inverter is started, usually the abnormality of the device will immediately lead to an abnormal control, and the inverter can be stopped through a series of error reports. However, these error reports are not specific to the specific device, and it is difficult to find the abnormal device immediately.
Method used
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[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail.
[0031] figure 1 It is a schematic diagram of the framework of the self-detection and self-correction system of the frequency converter according to an embodiment of the present invention, figure 2 for figure 1 The schematic diagram of the connection between the three-phase unit of the frequency converter and the motor used in the self-test and self-correction system of the frequency converter shown in the figure, please refer to figure 1 and figure 2 , the self-detection and self-correction system 100 of the frequency converter of the present embodiment is used for self-detection and self-correction of the frequency converter, which includes a current and voltage sampling module 10, a unit group detection module 20, a group detection analysis module 30, individual units A detection ...
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The invention provides a self-detecting and self-correcting system of a frequency converter, a self-detecting and self-correcting method of a frequency converter, a frequency converter and a computer-readable medium. The self-detecting and self-correcting system includes a current and voltage sampling module, a unit group detection module, a group detection and analysis module, an individual unitdetection module, and an individual unit analysis module. The unit group detection module carries out group dividing on a plurality of units on each phase. The current and voltage sampling module measures a first current value and a first voltage value in a loop at the moment of turning on or off an IGBT switch. The group detection and analysis module analyzes the first current value and the firstvoltage value to determine whether all groups of units are abnormal. The individual unit analysis module diagnoses a device having a problem in the units. Therefore, any device having a problem in aunit can be diagnosed accurately.
Description
technical field [0001] The invention relates to the technical field of frequency converters, in particular to a self-detection and self-correction system of frequency converters, a self-detection and self-correction method of cascaded frequency converters, a frequency converter and a computer-readable medium. Background technique [0002] Cascaded inverters are widely used in the industrial field. Units, current sensors and voltage measuring devices are important components of cascaded inverters. These devices must work properly to ensure the stable operation of the inverter. After the inverter is assembled for the first time or the components are replaced, the sensor may be installed reversely, and the unit power device and capacitor may also be abnormal, which will cause the inverter to fail to start and run normally. [0003] When the inverter is not started, each component can be manually detected and visually inspected after installation, but it takes a long time and ca...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 刘亚琼
Owner SIEMENS ELECTRICAL DRIVES SHANGHAI