A fuel cell system includes a fuel cell connected to a main bus through a converter, an auxiliary power supply connected in parallel to the main bus at an output side of the converter, and a controller electrically connected to the converter and configured to control the converter to adjust output of the fuel cell by changing a target input voltage of the converter, configured to increase the target input voltage of the converter when an output voltage of the converter is a set maximum value or more than the set maximum value, and configured to decrease the target input voltage of the converter when the output voltage of the converter is a set minimum value or less the set minimum value. Furthermore, a method of controlling the fuel cell system is disclosed.

A method for controlling multiple fuel cells of a fuel cell vehicle includes equally controlling, by a controller, power generation amounts of the respective fuel cells, deriving, by the controller, differences between output voltages of the respective fuel cells in a state in which the power generation amounts of the respective fuel cells are equal and determining whether or not differential control of the power generation amounts of the respective fuel cells is required based on the differences between the output voltages, correcting, by the controller, power generation control values of the respective fuel cells depending on the differences between the output voltages upon determining that differential control of the power generation amounts of the respective fuel cells is required, and differentially controlling, by the controller, the power generation amounts of the respective fuel cells depending on the corrected power generation control values.

The present disclosure is directed to systems and methods involving a power converter and various control schemes in which the power converter is able to monitor and intelligently manage various operational scenarios such as startup and shutdown of a fuel cell, load sharing among two or more available power sources, and exporting excess power from one available power source to a different power source, as well as transient step up and step down load situations requiring an immediate increase or decrease in the power being provided to a load. Various hierarchical power converter control schemes are also disclosed for addressing different types of operational scenarios, which enable the power converter to centrally manage some or all of the available power sources to optimally use all of the power supplying resources available to it to best meet the requirements of the load.

A thermal management control apparatus includes: a stack cooling line configured to cool a fuel cell stack of the fuel cell electric vehicle; a battery cooling line configured to cool a battery of the fuel cell electric vehicle; a heat exchanger configured to exchange heat between a stack coolant of the stack cooling line and a battery coolant of the battery cooling line; a valve configured to control an inflow of the stack coolant to the heat exchanger; and a control apparatus. The control apparatus is configured to diagnose whether a component of the valve or the battery cooling line has failed when the battery is overheated and to control a fuel cell output to cool the stack coolant and cool the battery by using a temperature of the stack coolant when a failure of the valve or a component failure of the battery cooling line occurs.

A fuel cell system including a power generator including a fuel cell stack generating power with fuel and oxidant gas and oxidant gas, a combustor that combusts combustible gas introduced from a combustion gas inlet, and a fuel supply line connected to a fuel inlet leading to an anode of the generator, and a circulation system including a fuel off-gas line connected to a fuel off-gas outlet leading to an outlet of the anode, a heat exchanger in the fuel off-gas line, a combustion gas line branching from a downstream of the heat exchanger in the fuel off-gas line and connected to the combustion gas inlet, a recirculation line branching from downstream of the heat exchanger in the fuel off-gas line and connected to the fuel supply line, and a pressure control valve adjusting a pressure of the recirculation line distributing the fuel off-gas at a predetermined distribution ratio.

A fuel cell system including a power generator including a fuel cell stack that generates power with fuel gas and oxidant gas, the fuel gas supplied to an anode, the oxidant gas supplied to a cathode, and a fuel supply line connected to a fuel inlet leading to the anode, a circulation system including a fuel off-gas line connected to a fuel off-gas outlet leading to an outlet of the anode, a heat exchanger in the fuel off-gas line, and a recirculation line downstream of the heat exchanger in the fuel supply line and the fuel supply line; and a condensed water line branching from the downstream of the heat exchanger discharging condensed water from the fuel off-gas and condensed by the heat exchanger, wherein the recirculation line is connected to the fuel supply line above a branch point between the fuel off-gas line and the condensed water line.

An embodiment of the present disclosure relates to an energy generation system including a first energy generation part configured to generate electrical energy on the basis of an electrochemical reaction of a target fluid, and a second energy generation part configured to operate by receiving water discharged from the first energy generation part and generate electrical energy on the basis of a potential difference made by a movement and evaporation of the water, thereby obtaining an advantageous effect of improving energy generation efficiency.

A required output (power consumption amount) of each of loads to which electrical power generated by fuel cell stacks is supplied is adjusted, in a manner so that a difference in a residual amount of fuel in the fuel tanks between fuel cell engines is reduced.

The fuel cell system includes a first fuel cell stack, a second fuel cell stack, a first cooling system that causes a refrigerant to flow through the first fuel cell stack, a second cooling system that causes the refrigerant to flow through the second fuel cell stack, and a heat transfer system that allows the refrigerant to flow between the first cooling system and the second cooling system and to shut off the refrigerant.

A control system for controlling a fuel cell system is provided, wherein the fuel cell system comprises a plurality of sub-units. The control system comprises a control unit being configured to control each of the sub-units individually.