METHOD AND APPARATUS FOR DETECTING CAPACITANCE VALUE OF FILTER CAPACITOR IN INVERTER

A method and an apparatus for detecting capacitance of a filter capacitor of an inverter are provided, where each output terminal of the inverter is connected to one terminal of a first filter capacitor through an inductor, and the other terminals of all first filter capacitors are interconnected. T...

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Bibliographische Detailangaben
Hauptverfasser:	YIN, Kai, XU, Zhiwu, MENG, Yuandong
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method and an apparatus for detecting capacitance of a filter capacitor of an inverter are provided, where each output terminal of the inverter is connected to one terminal of a first filter capacitor through an inductor, and the other terminals of all first filter capacitors are interconnected. The method includes: outputting, by the inverter, a first voltageU̇1ithrough an ithoutput terminal of the inverter, where a voltage output by an output terminal different from the ithoutput terminal is zero, i=1, 2...N, i≠j, 1≤j≤N, i and j are positive integers, and N is a total quantity of output terminals of the inverter; obtainingİikand determining a ratio of \|İij\| to \|İik\|, whereİikis a current of an inductor connected to a kthoutput terminal when the ithoutput terminal outputs the first voltageU̇1i, k=1, 2...N, and k is a positive integer; and determining, based onİij,U̇1i, and the ratio of \|İij\| to \|İik\|, capacitance of a first filter capacitor connected to the jthoutput terminal.