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Inverter for a three-phase AC photovoltaic system

  • US 8,618,456 B2
  • Filed: 02/15/2011
  • Issued: 12/31/2013
  • Est. Priority Date: 02/16/2010
  • Status: Expired due to Fees
First Claim
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1. An inverter apparatus for converting power from a bipolar photovoltaic source to 3-phase AC power, comprising:

  • a bipolar DC input port, a DC capacitive energy storage element, a single-stage DC to 3-phase power converter, AC line isolation contactors, a 3-phase AC output port and a control circuit;

    wherein the bipolar DC input port is configured to accept two monopolar photovoltaic source circuits, where a first conductor of each of said monopolar photovoltaic source circuits is coupled to earth ground and where a second conductor of each of said monopolar photovoltaic source circuits are collectively of opposite polarities and coupled across a DC capacitive energy storage bus;

    wherein the DC capacitive energy storage element further comprises film type capacitors;

    wherein the DC capacitive energy storage element is coupled to an input of the single-stage DC to 3-phase power converter;

    wherein the AC line isolation contactors are configured to make or break a coupling between an output of the single-stage DC to 3-phase power converter and the 3-phase AC output port under control of the control circuit; and

    wherein the 3-phase AC output port is connected to an electrical utility grid.

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