Serially connected inverters

  • US 9,866,098 B2
  • Filed: 06/12/2014
  • Issued: 01/09/2018
  • Est. Priority Date: 01/12/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method, comprising:

  • connecting input terminals of a plurality of micro-inverters to direct current outputs of respective photovoltaic panels;

    connecting output terminals of the plurality of micro-inverters serially to a serial voltage output, wherein the plurality of micro-inverters comprise respective bypass current paths comprising at least two switches connected between the output terminals of the respective one of the plurality of micro-inverters to form an alternate current path between the output terminals of the respective one of the plurality of micro-inverters;

    inverting, with the plurality of micro-inverters, input direct current (DC) power received at the input terminals of each of the plurality of micro-inverters to output alternating-current (AC) power at the output terminals of the respective one of the plurality of micro-inverters while maintaining a serial voltage of the serial voltage output substantially equal to a grid voltage of a grid connected across the serial voltage output;

    in response to determining a failure of one or more micro-inverters of the plurality of micro-inverters, bypassing the one or more micro-inverters by switching the at least two switches of the bypass current path of each of the one or more micro-inverters;

    operating the plurality of micro-inverters in synchronization with the grid voltage; and

    in response to determining a failure in operating at least one of the plurality of micro-inverters to be in synchronization with the grid voltage, bypassing the output terminals of the at least one of the plurality of micro-inverters by switching the at least two switches of the respective bypass current path and operating others of the plurality of micro-inverters to adjust the serial voltage to the grid voltage.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×