Determining the relative effectiveness of islanding detection methods using phase criteria and nondetection zones

Islanding of a utility-interactive photovoltaic (UIPV) system occurs if the UIPV system continues to power a section of the utility system after that section has been disconnected from the utility source. Since islanding creates hazards for personnel and equipment, UIPV systems are required to detect and prevent it. It is desirable to have a simplified method of determining which islanding detection methods (IDMs) are most effective. In this paper, a previously described method for finding the nondetection zones (NDZs) of IDMs is experimentally verified. This method is used to determine the NDZs of several common IDMs. These results indicate that, of the IDMs discussed in this paper: (1) Sandia Frequency Shift (SFS) is most effective; and (2) the worst-case loads are low-power loads that are near resonance at the line frequency and have a large capacitance and small inductance (a high value of the quality factor Q).

[1]  Michael Eugene Ropp,et al.  Design issues for grid-connected photovoltaic systems , 1998 .

[2]  Hirofumi Shinohara,et al.  A high speed frequency shift method as a protection for islanding phenomena of utility interactive PV systems , 1994 .

[3]  A. Kitamura,et al.  Islanding phenomenon elimination study at Rokko test center , 1994, Proceedings of 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC and PSEC).

[4]  Ajeet Rohatgi,et al.  Prevention of islanding in grid‐connected photovoltaic systems , 1999 .

[5]  G. Kern.  SunSine300, utility interactive AC module anti-islanding test results , 1997, Conference Record of the Twenty Sixth IEEE Photovoltaic Specialists Conference - 1997.

[6]  Robert A. Jones,et al.  Investigation of potential islanding of dispersed photovoltaic systems , 1988 .

[7]  H. Kobayashi,et al.  Method for preventing islanding phenomenon on utility grid with a number of small scale PV systems , 1991, The Conference Record of the Twenty-Second IEEE Photovoltaic Specialists Conference - 1991.