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System and method for responding to abrupt load changes on a power system

  • US 20070273213A1
  • Filed: 05/23/2006
  • Published: 11/29/2007
  • Est. Priority Date: 05/23/2006
  • Status: Active Grant
First Claim
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1. A micro grid system electrically transferring power from at least one external power source to an alternating current (AC) power system, comprising:

  • a direct current (DC) bus operable at a nominal DC voltage;

    a primary converter module electrically coupled between the DC bus and a first external power source, and operable to transfer an initial amount of power received from the first external power source to the DC bus;

    a secondary converter module electrically coupled between the DC bus and the AC power system, and operable to transfer power received from the DC bus to the AC power system; and

    an auxiliary DC power storage device electrically coupled to the DC bus, and operable to source or sink auxiliary DC power to the DC bus,where, in response to an abrupt load change, the auxiliary DC power storage device sources or sinks an amount of auxiliary DC power that is equal to at least a portion of the abrupt load change, the primary converter module maintains transfer of the initial amount of power received from the first external power source, and the secondary converter module changes power transferred to the AC power system to at least approximately match a sum of the initial amount of power received from the first external power source and the amount of auxiliary DC power.

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