Maximizing power in a photovoltaic distributed power system

  • US 9,812,984 B2
  • Filed: 01/30/2013
  • Issued: 11/07/2017
  • Est. Priority Date: 01/30/2012
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a plurality of parallel-connected compensated photovoltaic strings, each compensated photovoltaic string including;

    a photovoltaic string having a series-connection of photovoltaic cells; and

    a voltage-compensation circuit having an input connected to a source of power independent from power provided by the photovoltaic string, wherein the voltage-compensation circuit is configured to produce, from the source of power, an output power having an adjustable compensation voltage at a voltage output connected in series with a voltage generated by said photovoltaic string such that a total voltage of the compensated photovoltaic string maintains a predetermined value;

    a central controller connected to the voltage-compensation circuits and configured to control the adjustable compensation voltages; and

    a power sensor connected to a direct current output of the plurality of the parallel-connected compensated photovoltaic strings and to the central controller, wherein the power sensor is configured to sense a power parameter at the direct current output and provide the sensed power parameter to the central controller,wherein the central controller is configured to control the adjustable compensation voltages based on a maximum power from all the parallel-connected compensated photovoltaic strings and based on the sensed power parameter.

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