Invention Grant
- Patent Title: System and method for anti-islanding, such as anti-islanding for a grid-connected photovoltaic inverter
- Patent Title (中): 用于防孤岛的系统和方法,如并网光伏逆变器的防孤岛
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Application No.: US11872598Application Date: 2007-10-15
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Publication No.: US07906870B2Publication Date: 2011-03-15
- Inventor: Dal Y. Ohm
- Applicant: Dal Y. Ohm
- Applicant Address: US OR Bend
- Assignee: PV Powered, Inc.
- Current Assignee: PV Powered, Inc.
- Current Assignee Address: US OR Bend
- Agency: Perkins Coie LLP
- Main IPC: H02J1/00
- IPC: H02J1/00 ; H01H47/20 ; H02H3/00

Abstract:
A system and method for detecting islanding in a Distributed Generation utility grid is described. In some examples, the system, via an inverter, injects a frequency disturbance to a location of the utility grid associated with a DG generator, measures both the frequency error due to the disturbance and the frequency drift of the location of the utility grid, and determines islanding based on a maximum value of the frequencies. In some cases, the system is able to reduce or minimize the Non-Detection Zone of the inverter by detecting islanding without always relying on a detectable frequency error due to an injected waveform.
Public/Granted literature
- US20080122293A1 System and Method for Anti-Islanding, Such as Anti-Islanding for a Grid-Connected Photovoltaic Inverter Public/Granted day:2008-05-29
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