A stack module fault detection system, comprising an insulation resistance tester; a stack module, consisting of a plurality of stacks; and a plurality of switch groups, wherein each switch group comprises a first switch and a second switch, each switch group is respectively connected with a stack, the first end of the first switch is connected with the positive electrode of the stack, and the first end of the second switch is connected with the negative electrode of the stack; the second end of the first switch is connected with the positive electrode of the insulation resistance tester, and the second end of the second switch is connected with the negative electrode of the insulation resistance tester. A controller connected with the control end of the switch group controls the opening and closing of the switch group. The insulation resistance tester detects the insulation resistance of each stack in turn and sends the insulation resistance to the controller to monitor the insulation fault in the stack module. Under the condition of not disassembling the stack module, the insulation resistance of each stack is detected, and the stack with insulation fault can be located, so that the operation of fault positioning is simplified.

A hierarchical fault classification method for a fuel cell system, a multi-stage fault diagnosis method therefor, and a fault diagnosis device therefor are disclosed. The fuel cell system is divided into a subsystem, a component, and an element step by step. The multi-stage fault diagnosis method includes detecting a subsystem, a fault of which occurs, in the fuel cell system composed of a plurality of subsystems and detecting an upper-level component, which causes the fault, among upper-level components included in the subsystem, the fault of which occurs, using measurement data and a control signal.

The present application provides a stack module fault monitoring system, comprising an insulation resistance tester; a stack module, which consists of m groups of stack strings; m electronic switch groups, wherein each electronic switch group comprises a first switch and a second switch; one end of the first switch is connected with positive electrodes of one group of stack strings, and the other end of the first switch is connected with a positive electrode end of the insulation resistance tester; one end of the second switch is connected with negative electrodes of the group of stack strings, and the other end of the second switch is connected with a negative electrode end of the insulation resistance tester; a control end of a switch in the electronic switch group is connected with a controller, and the switch in the electronic switch group is controlled to be on and off by the controller; the insulation resistance tester tests the insulation resistance of each group of stack strings in sequence and sends the insulation resistance to the controller; the controller determines whether the group of stack strings has then insulation fault or not according to the insulation resistance, so as to realize online monitoring on whether each group of stack strings has the insulation fault or not, and quickly position the stack string with the insulation fault in the stack module.

A fuel cell system for air vehicles, wherein the fuel cell system comprises: a fuel cell, a fuel gas system for supplying fuel gas to the fuel cell, a potential sensor, and a controller; wherein the fuel gas system comprises a fuel gas supplier; wherein the controller determines whether or not a potential of the fuel cell measured by the potential sensor, is a reversal potential; and wherein, when the controller determines that the potential of the fuel cell is a reversal potential, the controller increases a fuel gas supply from the fuel gas supplier to the fuel cell.

An electrical system, and, more particularly, to an electrical system for an aircraft comprising one or more energy sinks and a hybrid energy storage system. The hybrid energy storage system may comprise one or more primary energy sources, a secondary energy source, and a secondary energy source control unit. The one or more primary energy sources may be coupled to and supply power to the one or more energy sinks. The secondary energy source may be coupled to the one or more primary energy sources and adapted to supply power at a variable output voltage to the one or more primary energy sources.

A fuel cell system includes a first ion exchanger, a first fuel cell stack and a second fuel cell stack, a first temperature acquisition part and a second temperature acquisition part, a first power generation time acquisition part and a second power generation time acquisition part, a supply path, an ion concentration estimation part that estimates ion concentration of a refrigerant on the basis of the ion concentration estimated by the ion concentration estimation part, a determination part that determines an exchange timing of the first ion exchanger on the basis of the ion concentration estimated by the ion concentration estimation part, and a control part, and a first refrigerant flow path and a second refrigerant flow path are provided in series or in parallel.

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 method and a device for detecting internal carbon deposition of a solid oxide fuel cell system. The method comprises the following steps: adjusting a temperature in a reformer of the solid oxide fuel cell system so that a mixed gas discharged from the reformer is at a detection temperature; sampling the mixed gas; detecting a gas sample to obtain a mole fraction of each gas, and calculating an equilibrium constant K1 of a Boudouard reaction according to the obtained mole fraction; calculating an equilibrium constant K2 of the Boudouard reaction according to thermodynamics; comparing K1 and K2, if K1 is less than K2, determining that there will be no carbon deposition in the solid oxide fuel cell system; and if K1 is greater than K2, determining that there will be carbon deposition in the solid oxide fuel cell system. By using the method, a carbon deposition condition in the solid oxide fuel cell system can be detected to effect early warning regarding the solid oxide fuel cell system and take preventive measures

The present invention relates to a fuel cell system and a control method for the same, it may be configured to include a plurality of stacks connected in series with each other, and supply moisture from one or more stacks of the plurality of stacks to one or more other stacks according to an operation condition of each of the plurality of stacks, and it has an advantage of improving an operation performance by uniformly forming the humidity condition of each of the plurality of stacks.

In a case where each of the temperature, the impedance, and the output current of a fuel cell stack falls within a predetermined range, the output voltage of the fuel cell stack is measured, and the measured output voltage is compared with a reference value to thereby determine the degree of degradation of the fuel cell stack.