IMPEDANCE MEASUREMENT METHOD AND PHOTOVOLTAIC SYSTEM

An impedance detection method (800, 900, 1000, and 1100) and a photovoltaic system (400, 500, 1200, 1300, 1400, 1500, and 1600) are provided, to help reduce complexity and costs of impedance detection. The method includes: sampling a voltage between a direct current bus and a protective earthing (PE...

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Bibliographische Detailangaben
Hauptverfasser:	LIN, Tiansan, LIN, Jianfei, GAO, Yongbing
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-REDRADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, E.G. USINGPHOTOVOLTAIC [PV] MODULES MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	An impedance detection method (800, 900, 1000, and 1100) and a photovoltaic system (400, 500, 1200, 1300, 1400, 1500, and 1600) are provided, to help reduce complexity and costs of impedance detection. The method includes: sampling a voltage between a direct current bus and a protective earthing (PE) at each of a first time point and a second time point, to obtain a first voltage value (U1) and a second voltage value (U2); sampling a leakage current (Ircd) on the direct current bus at each of the first time point and the second time point, to obtain a first current value (Ircd1) and a second current value (Ircd2); and calculating an insulation impedance value (Rpv) of a combiner box (1, 2, ..., M, and 240) based on a difference between the first voltage value (U1) and the second voltage value (U2) and a difference between the first current value (Ircd1) and the second current value (Ircd2), to determine whether impedance of the combiner box (1, 2, ..., M, and 240) is abnormal.