Method for managing the operation of a hybrid system
First Claim
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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Accused Products
Abstract
A method for managing the operation of a hybrid continuous current supply, said supply including a fuel cell stack a battery and a DC/DC converter including an input and an output, the converter input being connected to the output of the fuel cell stack and the 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.
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Citations
13 Claims
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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 operations
a) 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 stack d) 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification