Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems

Technical Report · Fri Nov 01 04:00:00 EST 2002

DOI:https://doi.org/10.2172/806700· OSTI ID:806700

BOWER, WARD I ^[1]; ROPP, MICHAEL

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1. Sandia National Laboratories

This report describes the various methods and circuits that have been developed to detect an islanding condition for photovoltaic applications and presents three methods that have been developed to test those methods and circuits. Passive methods for detecting an islanding condition basically monitor parameters such as voltage and frequency and/or their characteristics and cause the inverter to cease converting power when there is sufficient transition from normal specified conditions. Active methods for detecting the island introduce deliberate changes or disturbances to the connected circuit and then monitor the response to determine if the utility grid with its stable frequency, voltage and impedance is still connected. If the small perturbation is able to affect the parameters of the load connection within prescribed requirements, the active circuit causes the inverter to cease power conversion and delivery of power to the loads. The methods not resident in the inverter are generally controlled by the utility or have communications between the inverter and the utility to affect an inverter shut down when necessary. This report also describes several test methods that may be used for determining whether the anti-islanding method is effective. The test circuits and methodologies used in the U.S. have been chosen to limit the number of tests by measuring the reaction of a single or small number of inverters under a set of consensus-based worst-case conditions.

• Research Organization: Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 806700
• Report Number(s): SAND2002-3591
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
24 POWER TRANSMISSION AND DISTRIBUTION
DETECTION
DISTURBANCES
ELECTRIC IMPEDANCE
INTERCONNECTED POWER SYSTEMS
INVERTERS
LOAD ANALYSIS
MONITORS
PERFORMANCE TESTING
PHOTOVOLTAIC POWER SUPPLIES