Invention Grant
US07906870B2 System and method for anti-islanding, such as anti-islanding for a grid-connected photovoltaic inverter 失效
用于防孤岛的系统和方法,如并网光伏逆变器的防孤岛

  • 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
  • Application No.: US11872598
    Application Date: 2007-10-15
  • Publication No.: US07906870B2
    Publication 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
System and method for anti-islanding, such as anti-islanding for a grid-connected photovoltaic inverter
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.
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