Method for diagnosing standard deviation of detail coefficients of faults of power converter of switched reluctance motor
A technology of switched reluctance motors and power converters, which is applied in the direction of measuring electric variables, AC motor control, instruments, etc., and can solve the problems of stoppage, fault diagnosis methods that cannot be directly applied, and failure to make fault type judgments, and achieve good results. Good engineering application value, reliable effect of fault diagnosis
A technology of switched reluctance motors and power converters, which is applied in the direction of measuring electric variables, AC motor control, instruments, etc., and can solve the problems of stoppage, fault diagnosis methods that cannot be directly applied, and failure to make fault type judgments, and achieve good results. Good engineering application value, reliable effect of fault diagnosis
CN103454550AActive Publication Date: 2013-12-18CHINA UNIV OF MINING & TECH
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[0014] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0015] Such as figure 1 As shown, it is the main circuit of the three-phase switched reluctance motor double-switch power converter. Each phase of the three-phase double-switch power converter has two main switches and two freewheeling diodes, A phase, B phase, and C phase Connect in parallel to the positive pole "+" and negative pole "-" of the power supply. Among them, one end of the upper main switch S1 of phase A is connected to the positive pole "+" of the power supply, the other end of the upper main switch S1 is connected to one end of the winding of phase A, one end of the lower main switch S2 is connected to the negative pole "-" of the power supply, and the other end of the lower main switch S2 is One end is connected to the other end of the A-phase winding, one end of the upper freewheeling diode VD1 is connected to the positive pole "+" of the ...
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The invention discloses a method for diagnosing standard deviation of detail coefficients of faults of a power converter of a switched reluctance motor. The standard deviation sigma of the detail coefficients is calculated by detecting the phase current transient values of the power converter of the switched reluctance motor, the standard deviation sigma is used as fault characteristic quantity, and master switch short-current faults of the power converter of the switched reluctance motor are diagnosed by adopting a curve of the standard deviation sigma of the detail coefficients of the phase currents of the power converter of the switched reluctance motor in a whole rotating speed range or a whole turning moment range. The method for diagnosing the standard deviation of the detail coefficients of the faults of the power converter of the switched reluctance motor is suitable for switched reluctance motor power converters of multiple phases and multiple topological structures, accurate in diagnosis for short-current faults, and good in engineering application value.
Description
technical field [0001] The invention relates to a method for diagnosing the standard deviation of short-circuit fault detail coefficients, in particular to a method for diagnosing the standard deviation of short-circuit fault detail coefficients of power converters suitable for switched reluctance motors with various phases. Background technique [0002] Although the research on fault detection and diagnosis technology for switched reluctance motor system has gradually attracted extensive attention of researchers at home and abroad, it started late and achieved few results. Most researches on fault diagnosis of switched reluctance motor systems are based on qualitative theoretical analysis or comparative analysis of system fault state and normal state performance. The power converter is an important part of the switched reluctance motor system, and it is a place where failures occur frequently. Most of the fault protection measures for power converters stay at the level of ...
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Patent Timeline
18 Dec 2013
Publication
CN103454550A
- IPC
- G01R31/02
- CPC
- G01R31/3277; G01R31/42; H02P25/092; G01R31/343; G01R31/52; G01R31/50
- Inventors
- 陈昊; 韩国强