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Method for managing the operation of a hybrid system

  • US 8,889,276 B2
  • Filed: 05/30/2012
  • Issued: 11/18/2014
  • Est. Priority Date: 06/01/2011
  • Status: Active Grant
First Claim
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1. A method for managing the operation of a hybrid continuous current supply, said supply comprising a fuel cell stack, a battery and a DC/DC converter including an input and an output, the converter input being connected to an output of the fuel cell stack and the converter output being connected to a variable load in parallel to the battery, the fuel cell stack being formed of a plurality of electrochemical cells adapted to produce electricity from a fuel and an oxidising gas, wherein said method includes the following operationsa) supplying a flow of fuel and a flow of oxidising gas to each of the electrochemical cells;

  • b) defining a set point representative of the variable load;

    c) monitoring the fuel pressure and the oxidising gas pressure in the fuel cell stackd) regulating the pressure in the fuel cell stack at a first reference value;

    e) distributing the variable load between the fuel cell stack and the battery as a function of the set point, by varying the output voltage of the DC/DC converter;

    f) monitoring a voltage representative of the voltage at the terminals of at least one of the electrochemical cells of the fuel cell stack;

    g) monitoring the set point representative of the variable load;

    if the voltage representative of the voltage at the terminals of at least one of the cells exceeds a first predetermined critical value and if the set point indicates a decrease in the variable load;

    h) interrupting operation (d) and interrupting operation (e); and

    i) regulating the voltage representative of the voltage at the terminals of at least one of the cells at a second reference value by adapting the input impedance of the DC/DC converter;

    j) distributing the variable load between fuel cell stack and the battery by varying pressure.

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