A fuel cell system includes: a fuel cell; a target operating point determination unit that determines a warm-up target operating point based on a required electric power amount during warm-up and a required heat generation amount during warm-up; an operation control unit; and a failure state identification unit that identifies whether an electric power consumption device that operates by consuming generated electric power generated by the fuel cell has failed. When a failure of the electric power consumption device is identified, the target operating point determination unit determines an operating point that satisfies a required electric power amount during a failure that is set to be smaller than the required electric power amount during the warm-up and a required heat generation amount during the failure that is set to be smaller than the required heat generation amount during the warm-up as a target operating point during the failure.

A control system and a control method of fuel cell stacks are provided. The control system includes a set of fuel cell stacks, a secondary battery, a monitoring device, and a control device. Each fuel cell stack has a power output that can be independently started up or shut down. The secondary battery is connected to power output terminals of the fuel cell stacks via a power transmission path. The monitoring device is configured to monitor an electrical parameter of the power transmission path. The control device receives an electrical parameter signal from the monitoring device, and outputs a control signal to shut down or start up the power output of at least one of the fuel cell stacks if the electrical parameter's value is higher than a predetermined upper limit or lower than a predetermined lower limit.

A fuel cell system includes: a fuel cell; a fuel cell step-up converter having an input terminal, wherein the input terminal is connected to the fuel cell; a secondary cell; a secondary cell step-up converter having an input terminal an output terminal, wherein the input terminal is connected to the secondary cell. wherein the output terminal is connected to an output terminal of the fuel cell step-up converter; and a control device configured to control at least the fuel cell step-up converter and the secondary cell step-up converter to control the fuel cell system, wherein, the control device executes interruption control when the control device executes continuity control and an output of the fuel cell system is requested to be greater than an output of the secondary cell in the continuity control, wherein the continuity control is a control to control the secondary cell step-up converter to output an input voltage from the secondary cell without stepping up the input voltage, wherein the interruption control is a control to interrupt an electrical connection between the fuel cell system and the secondary cell.

A fuel-cell system for powering an electrical load, the system having first and second fuel cells, each having a positive node and a negative node. The positive node of the second fuel cell is electrically coupled to the negative node of the first fuel cell, and the positive node of the first fuel cell and the negative node of the second fuel cell are electrically coupled to the electrical load. Each fuel cell is electrically coupled to the electrical load without a power converter.

A fuel cell system 1 includes a fuel cell FC having a plurality of fuel battery cells, a control unit Cnt configured to control power generation of the fuel cell FC, a power storage apparatus S, and a DCDC converter Cnv. The control unit Cnt makes the voltage of the fuel cell FC higher than the voltage of the power storage apparatus S when the power generation by the fuel cell FC is stopped and makes the power generated in the fuel cell FC when the power generation by the fuel cell FC is stopped chargeable to the power storage apparatus S through a first path having diodes D1, D3, D5.

The invention relates to a method for operating a fuel cell arrangement which has a fuel cell for providing electrical energy in an electric circuit that has a circuit which is electrically connected to the fuel cell via a DC-DC converter, and a battery. It is provided that in at least one mode of operation of the fuel cell arrangement, following a start-up of the fuel cell, the battery is electrically disconnected from the circuit, and the DC-DC converter is operated in non-switched mode in order to supply at least one electrical consumer in the circuit with electric current provided by the fuel cell. The invention further relates to a fuel cell arrangement.

Disclosed are a grid-connected power conversion system and a control method thereof. The grid-connected power conversion system includes a fuel cell stack generating a DC voltage, a power conversion system (PCS) converting the DC voltage supplied from the stack into an AC voltage, a multi-input transformer including a primary coil having a plurality of voltage input terminals and a secondary coil transforming a magnitude of the voltage applied to the primary coil and outputting the transformed voltage, the plurality of voltage input terminals determining the number of turns of the primary coil differently from each other, one of the plurality of voltage input terminals receiving the AC voltage converted in the PCS, and a controller selecting the one of the plurality of voltage input terminals of the multi-input transformer based on the magnitude of the DC voltage generated from the stack and determining whether to replace the stack.

A redox flow battery system includes a battery cell that performs charge-discharge by supplying an electrolyte; a monitor cell to which the electrolyte is supplied; a voltmeter that measures an open circuit voltage of the monitor cell; a thermometer that measures a liquid temperature of the electrolyte; and a controller that controls the charge-discharge of the battery cell based on the open circuit voltage, and the controller corrects the open circuit voltage in accordance with the liquid temperature.

A method of driving a fuel cell-based vehicle may include determining whether the vehicle is in an ignition entry state, determining an open-circuit voltage of a battery that provides a voltage to the air compressor based on the vehicle being in the ignition entry state, determining a drive current provided to the air compressor from the battery based on the open-circuit voltage, and driving the air compressor based on the drive current.

An electrical power generating system for providing auxiliary or backup power to a load bus. The system may be used indoors, and generally includes a fuel cell unit comprising a first DC output, an electrical storage unit comprising a DC input coupled to the first DC output of the fuel cell, the electrical storage unit further comprising a second DC output. An inverter coupled to the second DC output receives power, the inverter comprising a first AC output. The system includes a contactor connected between the first AC output and an AC load bus. The AC load bus comprises an AC voltage, and a controller comprising inputs is adapted to sense a phase, a frequency, and a magnitude of the first AC output and the AC voltage and close the contactor when they substantially match.