A system for electric vehicle charging and hydrogen fueling leverages existing infrastructure of a localized renewable energy microgrid and utilizes excess generated energy to power an electrolyzer to produce hydrogen gas on site that is compressed and stored in a pressure vessel. A first portion of the stored hydrogen gas may be used for hydrogen fueling of a fuel cell electric vehicle (FCEV) via a hydrogen fuel dispenser that is provided at a charging station. A second portion of the stored hydrogen gas may be converted into electricity through use of one or more fuel cells. The generated electricity may be used for charging a battery of a battery electric vehicle (BEV) via an electric vehicle charging dispenser that is also provided at the charging station.

A method is provided for control of a system of charging points composed of at least two charging points, each of which is outfitted with at least one solid oxide fuel cell and with a high-voltage battery electrically connected or electrically connectible to the solid oxide fuel cell, where the charging points are adapted to provide electrical charging current via a converter at an interface for connection to a battery operated consumer. The method includes: checking the state of charge of the high-voltage battery of a first charging point by which the electric energy will be provided for charging the consumer via the interface, charging the high-voltage battery of the first charging point, and possibly that of the consumer, by a current-generating operation of the solid oxide fuel cell of the first charging point, if the state of charge of the high-voltage battery of the first charging point has fallen below a first limit value, and charging the high-voltage battery of the first charging point by means of an electric current provided by a second charging point if the state of charge of the high-voltage battery has fallen below a second limit value, located below the first limit value.

An electrical energy recovery, storage, and distribution system that may be used in a vehicle. The system may include a supercapacitor configured to quickly store large amounts of energy. The system may also include multiple circuits operating at different voltage levels, such that an output voltage from the supercapacitor is useful over a larger voltage range and the system is more energy efficient.

A redox flow battery system includes a cell that performs charging and discharging between the cell and a power system, a tank that stores an electrolyte supplied to the cell, a circulation pump that circulates the electrolyte between the cell and the tank, a power converter disposed between the cell and the power system, and a charge/discharge control unit that controls an operation of the power converter to control charging and discharging of the cell. When the charge/discharge control unit detects power failure in the power system, the charge/discharge control unit controls the power converter such that power of the electrolyte remaining in the cell is supplied to the circulation pump.

A power supply system of a fuel cell using user authentication includes: a tagging device that receives user information of a user terminal; an identity authentication unit, which compares the user information inputted through the tagging device with previously stored authentication information and outputs a use authority signal when the user information matches the authentication information; a power module complete that produces electric power by a chemical reaction between hydrogen and oxygen; a battery that receives and is charged with electric power produced by the power module complete; an output terminal that is connected to the battery to output electric power stored in the battery; and an integrated body control unit that controls electric power to be outputted through the output terminal when the identity authentication unit outputs the use authority signal.

A fuel cell system includes a fuel cell, a plurality of power consuming devices, a secondary battery, a charge-discharge amount sensor, and a controller configured to control operations of the plurality of power consuming devices. An identification section of the controller is configured to execute a variation process of varying the operation command value of one of the plurality of power consuming devices and, in a second case where an absolute value of a difference between an amount of change in the actual amount of charge and discharge and an amount of change in the estimated amount of charge and discharge before and after execution of the variation process is greater than a second threshold, identify the power consuming device, for which the operation command value is varied, as the device to be identified.

A condensate water drain control system for fuel cells includes a fuel cell stack configured to generate electric power through chemical reaction, a fuel supply line configured to recirculate fuel discharged from the fuel cell stack together with fuel introduced from a fuel supply valve, a water trap located in the fuel supply line, the water trap being configured to collect condensate water discharged from the fuel cell stack, a drain valve configured to discharge the condensate water stored in the water trap to the outside when opened, and a drain controller configured to determine whether the fuel supply valve is controlled such that pressure in the fuel supply line is maintained before the drain valve is opened and to sense discharge of fuel from the fuel supply line through the drain valve upon determining that the pressure is maintained.

A battery and a load device are connected to a fuel cell stack. Electric power is supplied from the battery to fuel cell auxiliary equipment. A controller of a fuel cell system has stored therein a desired output of the fuel cell stack. The controller predicts auxiliary equipment power consumption, which is the amount of electric power that is consumed by the fuel cell auxiliary equipment for operation of the fuel cell stack, and determines estimated input and output power of the battery. The controller determines a requested output, which is an output requested for the fuel cell stack, based on the predicted auxiliary equipment power consumption and the estimated input and output power. The controller determines an operating point of the fuel cell stack based on the desired output. The load device controls its operation so that the difference between the requested output and the desired output becomes zero.

Various embodiments manage a fuel cell IT grid system to maintain fuel cell temperatures above a threshold temperature. The system may include power modules each including a fuel cell, DC/DC converters each connected to a power module, a DC power bus connected to the DC/DC, IT loads each connected to the DC power bus, a load balancing load connected to the DC power bus, and a control device connected to a first power module. The control device may determine whether a temperature of the first power module exceeds the temperature threshold, determine whether an electrical power output of the power modules exceeds an electrical power demand of the IT loads in response to the temperature exceeding the temperature threshold, and direct excess electrical power output to the load balancing load in response to the electrical power output exceeding the electrical power demand.

A fuel cell system has a first boost converter of a fuel cell, a second boost converter of a secondary battery, and a control unit. Output sides of the first boost converter and the second boost converter are connected so as to be the same potential. The control unit is configured to, when detecting failure of the second boost converter, cause input and output sides of the second boost converter to conduct, estimate an open circuit voltage of the secondary battery based on a state of charge, and execute electric power consumption by an accessory that operates by electric power supplied from the fuel cell when determining that the first boost converter is not able to boost the output voltage of the fuel cell to the open circuit voltage, and stops the electric power consumption by the accessory when determining that the first boost converter is able to boost.