Three-phase inverter short-circuit fault detection method

Abstract

The invention discloses a short-circuit fault detection method of a three-phase inverter, which comprises collecting the line voltage in the three-phase inverter and converting the line voltage into a phase voltage; performing DQ decoupling processing on the line voltage and the phase voltage , get the active component detection value, reactive component detection value and zero-sequence component detection value corresponding to the line voltage and phase voltage respectively; Active component standard value, reactive component standard value and zero-sequence component standard value; compare the detection value and standard value corresponding to the line voltage and the corresponding detection value and standard value of the phase voltage, and determine whether the three-phase inverter is faulty according to the comparison result ; If no fault occurs, the three-phase inverter continues to run; if a fault occurs, the location of the fault is determined according to the phase voltage and line voltage and their corresponding detection values; according to the location of the fault, the pulse blockade protection of the switch is executed Or disconnect the main contactor to stop the inverter operation and end the detection.

Description

Technical field [0001] The invention relates to a fault detection method in a power system, in particular to a detection method for a three-phase inverter short-circuit fault. Background technique [0002] With the rapid development of the railway industry in my country, the electrical equipment on trains tends to be diversified and complicated, which makes the normal operation of the railway transportation system inseparable from the auxiliary converter, and proposes the power quality and reliability of the auxiliary power supply system. higher requirement. When the auxiliary inverter of the train has a phase-to-phase short circuit or a grounding short circuit, the short-term pressure of the current passing through the switch tube increases, which may cause the switch tube to burn out. In addition, the output current of the inverter increased sharply, causing all electrical appliances connected to the auxiliary converter to be damaged at the moment of the fault. This is an extr...

AI Technical Summary

Problems solved by technology

When the auxiliary inverter of the train has a phase-to-phase short circuit or a ground short circuit, the pressure of the current passing through the switch tube will increase for a short time, which may cause the switch tube to burn out

Moreover, the output current of the inverter increases sharply, causing all the electrical appliances connected to the auxiliary converter to be damaged at the moment of failure.

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