JP4099957B2 - Fuel cell power generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel cell power generator that supplies power generated by a fuel cell to a load, and more specifically, includes a discharge mechanism that prevents a deterioration phenomenon that occurs in the fuel cell after the power generation operation of the fuel cell power generator ends. The present invention relates to a fuel cell power generator.
[0002]
[Prior art]
A fuel cell is composed of a stack of unit cells, and causes an electrochemical reaction by supplying a fuel gas containing hydrogen and an oxidant gas containing air to the fuel electrode and air electrode, respectively. Known to generate electricity. In addition, it is known that a fuel cell has a power generation characteristic called a drooping characteristic, in which an output voltage decreases as the output current increases.
[0003]
When the fuel cell is at a temperature suitable for operation, an open circuit voltage, which is the voltage when the output current is zero, is generated, that is, the operation of the fuel cell is stopped or stopped, and the current to the load is cut off. If left in a state, the electrode catalyst particles become coarse and the electrode surface area decreases, which leads to a decrease in power generation performance and life of the fuel cell.
[0004]
Therefore, in order to avoid such a deterioration phenomenon of the fuel cell, when the operation of the fuel cell is stopped, the reaction gas (fuel gas and air) in the fuel cell is replaced with an inert gas such as nitrogen to reduce the open circuit voltage. 2. Description of the Related Art There is known a fuel cell power generator that performs an operation for preventing occurrence and suppresses an open circuit voltage by connecting a discharge resistor to the output side of the fuel cell.
[0005]
Hereinafter, the configuration of the main part of the conventional fuel cell power generator 100 will be described with reference to FIG.
[0006]
The fuel cell power generation device 100 includes a fuel cell 101, a chopper 102, an inverter 103, and an external load 104.
[0007]
The electric power generated and output by the fuel cell 101 is subjected to constant voltage control by the chopper 102 and the inverter 103, converted to an alternating current, and supplied to the external load 104.
[0008]
The fuel cell power generation apparatus 100 is provided between the output side of the chopper 102 and the input side of the inverter 3 as a discharge unit for suppressing the open circuit voltage after the operation of the fuel cell 101 is stopped. An intermediate circuit capacitor 105 used as a smoothing capacitor 102 and an intermediate discharge device 108 including a switch 106 and a discharge resistor 107 for discharging the electric charge stored in the intermediate circuit capacitor 105 are provided.
[0009]
In this fuel cell power generation device 100, when an operation stop command is sent from the control unit (not shown) to the fuel cell 101, the switch 106 of the intermediate discharge device 108 is closed, the external load 104 is shut off, the intermediate circuit capacitor 105, the discharge A resistor 107 is connected in series. At this time, the operation stop time of the chopper 102 is delayed from the time when the external load 104 is shut off by providing a delay circuit in consideration of the discharge time of the fuel cell 101.
[0010]
In such a fuel cell power generation device 100, the electric charge accumulated in the fuel cell 101 due to the generation of residual hydrogen and residual oxygen after the operation of the fuel cell 101 is stopped is accumulated in the intermediate circuit capacitor 105 via the chopper 102, Further, the discharge resistance 107 discharges through the switch 106.
[0011]
In this way, the fuel cell power generation apparatus 100 avoids deterioration without exposing the fuel cell 101 to an open circuit voltage.
[0012]
[Problems to be solved by the invention]
However, when the intermediate discharge device 108 is provided as a discharge unit as in the fuel cell power generation device 100 described above and the charge generated by the residual hydrogen is discharged by the discharge resistor 107, the discharge resistor 107 is used to shorten the discharge time. There is a problem that the fuel cell power generation device 100 itself is enlarged. Conversely, if the fuel cell power generation device 100 is downsized and the discharge resistance 107 is reduced, there is a problem that the discharge time becomes longer.
[0013]
Furthermore, since the cost of the fuel power generation device 100 increases when the discharge device 108 is installed like the conventional fuel cell power generation device 100, for example, the manufacturing cost of a fuel cell vehicle equipped with the fuel cell power generation device 100 is also increased. There is a problem of going up.
[0014]
Therefore, the present invention has been proposed in view of the above-described conventional problems, and is a fuel cell power generation capable of discharging in a short time and reliably the charge generated by the fuel gas remaining after the fuel cell power generation is stopped. The object is to provide an apparatus.
[0015]
[Means for Solving the Problems]
  In order to solve the above-described problem, the fuel cell power generation device according to claim 1 is a fuel cell power generation device mounted on a vehicle, wherein a fuel electrode and an oxidant electrode are opposed to each other with an electrolyte membrane interposed therebetween. A fuel cell comprising a plurality of fuel cell structures sandwiched between fuel cell structures by separators, and generating electricity by electrochemically reacting hydrogen contained in the fuel gas with oxygen in the air; and A chopper provided on the output side that converts the electric power generated by the fuel cell into a direct current and outputs it, and a chopper provided on the output side of the chopper that converts the direct current output from the chopper into an alternating current and outputs it An inverter that is provided on the output side of the inverter, discharges an alternating current output from the inverter, a current sensor that detects an output current value of the fuel cell, and an output current of the fuel cell. A voltage sensor for detecting a value, and when stopping the power generation of the fuel cell, power generation is performed with the oxidant gas and the fuel gas remaining in the fuel cell, and the output current of the fuel cell detected by the current sensor is a predetermined value. Control means for controlling the inverter to supply an alternating current to the motor so that the output current detected by the voltage sensor is constant until the output voltage detected by the voltage sensor is constant. And a motor circuit having a power motor for generating power for traveling of the vehicle, wherein the control means generates electric power with the oxidant gas and fuel gas remaining in the fuel cell and detects the fuel cell detected by the voltage sensor. The output voltage value is detected, and the alternating current output from the inverter is changed so that the output voltage value of the fuel cell becomes a constant voltage value. It was consumed by the power motor,UpIt is determined whether or not torque is generated in the power motor, and when torque is generated, the AC current that does not generate torque in the power motor is made to be consumed by the power motor. Features.
[0023]
  The fuel cell power generator according to claim 2 further includes an auxiliary motor that drives an auxiliary machine used to drive the power motor,InverterIs for power motors that convert AC current supplied to the power motorSemiconductor switching elementAnd for auxiliary motors that convert AC current supplied to the auxiliary motorSemiconductor switching elementIt consists of.
[0024]
  In the fuel cell power generator according to claim 3,Auxiliary machineFurther comprising the aboveChopperProvided on the output side of theChopperConvert the magnitude of the DC voltage output fromAuxiliary machineTo supplyDC / DC converterIs further provided.
[0026]
  In the fuel cell power generator according to claim 4, the control means is configured to set the alternating current value at which the power motor does not operate.InverterControl the above-mentioned auxiliary machineTo control the DC / DC converter.
[0027]
  In the fuel cell power generator according to claim 5, the above-mentionedmotorAs provided with a plurality of motors including the power motor asInverterA plurality.
[0028]
  In the fuel cell power generator according to claim 6, a predetermined fuel is reformed and hydrogen supplied to the fuel cell is taken out.Reforming reaction sectionFurther comprising the above-mentioned predetermined fuel residueReforming reaction sectionThe fuel gas taken out by the above is supplied to the fuel cell, and is generated and discharged.
[0029]
  Claim7In the fuel cell power generator according to the above, the electric power generated by the fuel cell is stored.Secondary batteryAnd aboveChopperProvided on the output side of theChopperDC current output fromSecondary batteryTo supplyRelay boxAnd further comprising.
[0030]
  In the fuel cell power generator according to claim 8, the above-mentionedSecondary batteryofStorage rateDetectSensorFurther comprisingThe control means controls the relay box so as to charge the secondary battery if it is not fully charged based on the accumulation rate detected by the sensor, and is fully charged based on the accumulation rate detected by the sensor. If so, control the relay box to stop power storage in the secondary battery.
[0032]
【The invention's effect】
  According to the fuel cell power generator of the first aspect, the electric charge generated when fuel gas or the like remains in the fuel cell after the fuel cell is stopped is converted into an alternating current.motorFor example, the charge generated after the power generation of the fuel cell is stopped can be reliably discharged in a short time.
  According to the fuel cell power generator according to claim 1, since the alternating current is consumed by the motor circuit, for example, the charge generated when fuel gas or the like remains in the fuel cell after the fuel cell is stopped, It can be converted into an alternating current and discharged by a motor circuit. For example, electric charges generated after stopping the power generation of the fuel cell can be discharged reliably in a short time. Furthermore, according to the fuel cell power generator of the first aspect, the motor circuit constituting the fuel cell system is used without the need for providing a resistor for discharging the output voltage from the fuel cell after the fuel cell is stopped, for example. Therefore, the apparatus can be reduced in size and cost.
[0040]
  According to the fuel cell power generator according to claim 2, the motor circuit is composed of a power motor as a power source and an auxiliary motor that drives an auxiliary machine used to drive the power motor.InverterFor power motors that convert AC to AC current supplied to the power motorSemiconductor switching elementAnd for auxiliary motors that convert AC current supplied to the auxiliary motorSemiconductor switching elementTherefore, the AC current supplied to the power motor and the AC current supplied to the auxiliary motor can be controlled separately. The power consumed by the power motor and the power consumed by the auxiliary motor Can be separate. Therefore, according to the fuel cell power generator according to claim 2, charges can be consumed by both the power motor and the auxiliary motor. For example, the charge generated after the power generation of the fuel cell is stopped can be further reduced in a short time. And it can discharge reliably.
[0041]
  According to the fuel cell power generator according to claim 3,Auxiliary machineThe motor circuit comprises a power motor as a power source,ChopperProvided on the output side of theChopperConverts the magnitude of the direct current output from and supplies it to the auxiliary machineDC / DC converterIs further provided.
[0042]
  Also,The amount of charge consumed by the auxiliary device can be controlled, and for example, the charge generated after the power generation of the fuel cell is stopped can be further discharged in a short time and surely. And this claim3According to the fuel cell power generator according to the present invention, since the electric charge can be consumed by using the auxiliary machine used when driving the power motor, the output voltage from the fuel cell is discharged after the fuel cell is stopped, for example. There is no need to provide a resistor or the like, and the device can be reduced in size and cost.
[0044]
  According to the fuel cell power generator of the fourth aspect, the AC current value is set so that the motor circuit does not operate.InverterSince only the auxiliary machine is operated, it is possible to prevent the motor circuit from being operated when unnecessary, and to realize discharge by the auxiliary machine.
[0045]
  According to the fuel cell power generator according to claim 5,motorIncluding a plurality ofInverterEach with multiple configurationsmotorThe AC current supplied to themotorThus, the electric charge can be consumed, and the electric charge generated after stopping the power generation of the fuel cell can be discharged in a shorter time and more reliably.
[0046]
  According to the fuel cell power generator of the sixth aspect, the predetermined fuel is reformed and the hydrogen supplied to the fuel cell is taken out.Reforming reaction sectionFor example, after stopping the power generation of the fuel cell,Reforming reaction sectionBecause the fuel gas extracted by is supplied to the fuel cell to generate electricityReforming reaction sectionThe fuel gas generated inmotorCan be discharged.
[0047]
  According to the fuel cell power generator according to claim 7, the electric power generated by the fuel cell is stored.Secondary batteryWhen,ChopperDC current output fromSecondary batteryTo supplyRelay boxBecause it was configured withRelay boxofSecondary batteryBy controlling the opening and closing of theSecondary batteryFor example, the electric charge generated after the power generation of the fuel cell is stopped can be discharged in a shorter time and more reliably, and the fuel consumption can be improved. Further, according to the fuel cell power generator of claim 7, it is necessary to configure the fuel cell system.Relay boxWhenSecondary batteryTherefore, for example, it is not necessary to provide a resistor for discharging the output voltage from the fuel cell after the fuel cell is stopped.
[0048]
  According to the fuel cell power generator according to claim 8,Secondary batteryofStorage rateDetectSensorHaving a configuration comprising:SensorDetected inStorage rateOn the basis of theSecondary batteryTo powerRelay boxControlSecondary batteryThe electric charge can be accumulated according to the accumulated amount of electric charge, or the electric charge can be discharged by other means, so that it can be discharged in a short time and surely, and the fuel efficiency can be further improved.
[0050]
DETAILED DESCRIPTION OF THE INVENTION
  First, a reference example will be described.
[0051]
  [Fuel as a first reference exampleConfiguration of Rechargeable Battery Power Generation Device 1]
  Using FIG.As a first reference exampleThe configuration of the fuel cell power generator 1 will be described.As a first reference exampleThe fuel cell power generator 1 is mounted on, for example, a fuel cell vehicle that uses a fuel cell as a power generation source, and is provided in a fuel cell vehicle system.
[0052]
The fuel cell power generator 1 includes a fuel cell 10, a relay box 11, a chopper 12, a second relay 13, and a discharge resistor 14.
[0053]
The fuel cell power generation device 1 includes a control unit that controls the fuel cell power generation device 1. This control unit is, for example, a fuel cell when the fuel cell power generation device 1 is mounted on a fuel cell vehicle system or the like. Centrally control the vehicle system. Specifically, the operation of each unit is controlled by the control unit, so that the power generated by the fuel cell 10 is supplied to the load and discharged. The processing contents of this control unit will be described later.
[0054]
The fuel cell 10 includes, for example, a plurality of fuel cell structures in which a fuel cell structure in which a fuel electrode and an oxidant electrode are opposed to each other with a solid polymer electrolyte membrane interposed therebetween is sandwiched by separators. The fuel cell 10 is supplied with hydrogen-rich fuel gas, and generates electricity by electrochemically reacting hydrogen contained in the supplied fuel gas with oxygen in the air.
[0055]
The relay box 11 includes two first relays 15 a and a first relay 15 b connected to the positive electrode and the negative electrode of the fuel cell 10. Each of the first relays 15 is connected in series to the fuel cell 10 and is controlled by the control unit so as to open and close a contact of a circuit that supplies electric power from the fuel cell 10 to a subsequent load.
[0056]
  The chopper 12 is an IGBT (Insulated Gate Bipolar Transistor) or GTBT 16 (hereinafter referred to as “IGBT16”), a voltage sensor 17, and a current sensor 18, which are semiconductor switching elements connected in series with the first relay 15 a. And. The control unit outputs a control signal to the IGBT 16 to control the operation, and the voltage sensor 17 and the current sensor 18 detect the operation.outputVoltage value andoutputThe current value is input as a sensor signal.
[0057]
The second relay 13 opens and closes a contact of a circuit that supplies power to the discharge resistor 14 at the subsequent stage. In the second relay 13, the opening / closing operation with respect to the discharge resistor 14 is controlled by a control signal from the control unit.
[0058]
The discharge resistor 14 discharges the electric charge generated by the power generation by the residual hydrogen and residual oxygen of the fuel cell 10 via the relay box 11, the chopper 12 and the second relay 13.
[0059]
Furthermore, the fuel cell 10 of the fuel cell power generator 1 may be provided with a fuel reformer that reforms a fuel such as natural gas or methanol into a hydrogen-rich gas in order to supply a hydrogen-rich gas. Good.
[0060]
  "As a first reference exampleOperation of Fuel Cell Power Generation Device 1]
  The processing procedure of the system stop process of the control unit performed when the fuel cell system of the fuel cell power generator 1 is stopped will be described with reference to the flowchart shown in FIG.
[0061]
In step S1, the control unit inputs a stop operation command for the fuel cell system, determines whether the stop operation sequence is performed, and if it is determined that the stop operation sequence is being executed, the process proceeds to step S2. If it is determined that the stop operation sequence has not been executed, the process of step S1 is repeatedly executed.
[0062]
In step S2, the control unit controls the two first relays 15a and 15b of the relay box 11 to be closed, and subsequently controls the second relay 13 to be closed. Further, the control unit operates the IGBT 16 so as to perform duty control that outputs an alternating current that repeatedly turns on and off intermittently, and causes the discharge resistor 14 to conduct to start discharge.
[0063]
In the next step S <b> 3, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is equal to or higher than a certain voltage value, for example, the lower limit voltage value determined for the fuel cell 10. The output of the IGBT 16 is controlled so that That is, the control unit controls the duty ratio of the current output from the IGBT 16 to vary the value of the current flowing through the discharge resistor 14.
[0064]
In the next step S4, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the detected fuel cell current value with a predetermined set value. The controller proceeds to step S5 if the detected fuel cell current is less than or equal to the set value, and returns to step S3 if greater than or equal to the set value.
[0065]
This step S4 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination varies depending on the system in which the fuel cell power generator 1 is mounted. For example, in a certain fuel cell vehicle system, the fuel cell current when the system is stopped is about 0.5 A, and the set value is set to about 0.1 A.
[0066]
In step S <b> 5, the control unit turns off the first relay 15 and the second relay 13 and also turns off the IGBT 16 (stops output), and ends the discharge operation at the discharge resistor 14.
[0067]
In the next step S6, the control unit ends the stop operation sequence of the fuel cell system.
[0068]
According to the fuel cell power generator 1 that operates as described above, the current flowing through the discharge resistor 14 can be controlled by controlling the duty ratio of the IGBT 16 by the control unit, and the fuel cell 10 is stopped when the fuel cell 10 is stopped. The electric charge generated by the hydrogen remaining inside can be discharged quickly and reliably.
[0069]
  Next, a first embodiment of the present invention will be described in detail with reference to the drawings.
  [No.1Configuration of Fuel Cell Power Generation Device 20 According to Embodiment]
  In FIG.1The configuration of the fuel cell power generator 20 to which the present invention is applied will be described as an embodiment. Note that the above-mentionedFirst reference exampleThe same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0070]
  The fuel cell power generator 20As a first reference exampleInstead of the second relay 13 and the discharge resistor 14 of the fuel cell power generator 1, an inverter 21 and a motor 24 (motor circuit) are connected to the subsequent stage of the chopper 12.
[0071]
  The chopper 21 includes an IGBT 22 and an IGBT 23, and is a chopper.12The DC power output from is converted into AC power, and the subsequent motor 24 is operated.
[0072]
The motor 24 is an electric motor and is energized by the AC power converted by the inverter 21. The motor 24 is, for example, a power motor for driving the vehicle in a fuel cell vehicle system in which the fuel cell power generator 20 is mounted.
[0073]
Further, the fuel cell power generation device 20 is provided with a control unit that controls each unit, and this control unit, for example, when the fuel cell power generation device 20 is mounted on a fuel cell vehicle system or the like, Control all over.
[0074]
  "No.1Operation of Fuel Cell Power Generation Device 20 According to Embodiment]
  4, 5, and 6 show the processing procedure of the first, second, and third system stop processes of the control unit when the fuel cell power generator 20 is stopped.
[0075]
"First system stop process"
In step S11 in the first system stop process shown in FIG. 4, the control unit inputs a stop operation command for the fuel cell system, determines whether or not the stop operation sequence is performed, and the stop operation sequence is executed. If it is determined, the process proceeds to step S12. If it is determined that the stop operation sequence is not executed, the process of step S11 is repeatedly executed.
[0076]
In step S12, the control unit closes the two first relays 15a and 15b of the relay box 11, and the control unit operates the IGBT 16 of the chopper 12, the IGBT 22 and the IGBT 23 of the inverter 21, and energizes the motor 24. To start the discharge.
[0077]
In the next step S13, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is smaller than a predetermined voltage, for example, a lower limit voltage value determined for the fuel cell 10. Then, the process proceeds to step S14. When the voltage of the fuel cell 10 is higher than the predetermined voltage, the operation of step S12 is maintained and the discharge is continued.
[0078]
In step S14, the control unit opens the first relays 15a and 15b, and also opens the IGBT 16 of the chopper 12 and the IGBTs 22 and 23 of the inverter 21, stops the energization of the motor 24, and ends the discharging operation. .
[0079]
In the next step S15, the control unit ends the system stop operation sequence.
[0080]
The fuel cell power generation apparatus 20 that performs such a first system stop process does not need to be provided with a load for discharging by executing the discharge with the motor 24, so that the apparatus can be reduced in size and cost.
[0081]
"Second system stop process"
In step S21 in the second system stop process shown in FIG. 5, the control unit inputs a stop operation command to the system, determines whether it is a stop operation sequence, and determines that the stop operation sequence is being executed. If so, the process proceeds to step S22. If it is determined that the stop operation sequence has not been executed, the process of step S21 is repeatedly executed.
[0082]
In step S <b> 22, the control unit controls the two first relays 15 a and 15 b of the relay box 11 to be in an on state in which they are closed. In addition, the control unit turns on the IGBT 16 of the chopper 12 and operates the IGBT 22 and IGBT 23 of the inverter 21 by intermittent duty control, and starts discharging by energizing the motor 24. Let
[0083]
In step S23, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the inverter so that the voltage of the fuel cell 10 becomes a certain voltage value, for example, the lower limit voltage value of the fuel cell 10. 21 controls the output of the IGBT 22 and IGBT 23. That is, the control unit controls the IGBT 22 and IGBT 23 to control the duty ratio, thereby changing the value of the current flowing through the motor 24.
[0084]
In step S24, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the predetermined set value with the detected fuel cell current value. When the detected fuel cell current is equal to or less than the set value, the control unit advances the process to step S25. When the detected fuel cell current is equal to or greater than the set value, the control unit returns the process to step S23.
[0085]
This step S24 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination varies depending on the system in which the fuel cell power generator 1 is mounted.
[0086]
In step S25, the control unit turns off the first relays 15a and 15b, and turns off the IGBT 16 of the chopper 12, the IGBTs 22 and IGBTs 23 of the inverter 21, and supplies power to the motor 24. To stop the discharge operation.
[0087]
In step S26, the control unit ends the system stop operation sequence.
[0088]
In this way, in the fuel cell power generation device 20, the current flowing through the motor 24 can be controlled by duty-controlling the IGBT 22 and the IGBT 23, so that rapid and reliable discharge can be performed.
[0089]
"Third system stop process"
In step S31 in the third system stop process shown in FIG. 6, the control unit inputs a stop operation command for the fuel cell system, determines whether or not the stop operation sequence is performed, and the stop operation sequence is executed. If it is determined that the stop operation sequence has not been executed, the process of step S31 is repeatedly executed.
[0090]
In step S <b> 32, the control unit controls the two first relays 15 a and 15 b of the relay box 11 to be in an on state in which they are closed. Further, the control unit turns on the IGBT 16 of the chopper 12 and operates the IGBT 22 and IGBT 23 of the inverter 21 by intermittent duty control, and starts discharging by energizing the motor 24.
[0091]
In the next step S <b> 33, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is equal to or higher than a certain voltage value, for example, the lower limit voltage value determined for the fuel cell 10. The outputs of the IGBTs 22 and 23 of the inverter 21 are controlled so that That is, the control unit controls the duty ratio of the alternating current output from the IGBTs 22 and 23 to vary the value of the current flowing through the motor 24.
[0092]
In step S34, the control unit determines whether torque is generated in the motor 24 by a sensor (not shown). If torque is generated, the process proceeds to step S35, and if torque is not generated. Advances the process to step S38.
[0093]
In step S35, since the torque is generated in the motor 24, the control unit controls the duty ratio of the IGBT 22 and the IGBT 23 of the inverter 21 to a current value that does not generate the torque in the motor 24, and generates the torque. Stop. That is, the control means of the motor 24 is changed from constant current control to constant voltage control.
[0094]
In the next step S36, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is smaller than a predetermined voltage, for example, a lower limit voltage value determined for the fuel cell 10. If no more, the process proceeds to step S37. If the voltage of the fuel cell 10 is lower than the predetermined voltage, the process returns to step S33.
[0095]
In step S <b> 37, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 becomes equal to or higher than a certain voltage value, for example, the lower limit voltage value determined for the fuel cell 10. In this manner, the outputs of the IGBTs 22 and 23 of the inverter 21 are controlled. That is, the control unit controls the duty ratio of the alternating current output from the IGBTs 22 and 23 to vary the value of the current flowing through the motor 24.
[0096]
In the next step S38, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the detected fuel cell current value with a predetermined set value. When the detected fuel cell current is equal to or less than the set value, the control unit proceeds to step S39, and when it is equal to or greater than the set value, the control unit returns the process to step S33.
[0097]
This step S38 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination differs depending on the system in which the fuel cell power generator 1 is mounted.
[0098]
In step S39, the control unit turns off the first relays 15a and 15b and turns off the IGBT 16 of the chopper 12, the IGBTs 22 and IGBTs 23 of the inverter 21, and turns on the motor 24. To stop the discharge operation.
[0099]
In the next step S40, the control unit ends the stop operation sequence of the fuel cell system.
[0100]
In the fuel cell power generation device 20 that operates by such third system control processing, the fuel cell current is supplied to the motor 24 so that torque is not generated. Therefore, the motor 24 does not rotate after the fuel cell system is stopped. The discharge process of the fuel cell 10 can be executed safely.
[0101]
Further, according to the fuel cell power generator 20, since no torque is generated in the motor 24, it is possible to eliminate the possibility of the motor 24 operating unexpectedly when the system is stopped and to improve safety.
[0102]
  Next, a second reference example will be described.
  [As a second reference exampleConfiguration of Fuel Cell Power Generation Device 30]
In FIG.As a second reference exampleThe structure of the fuel cell power generator 30 is shown. In the description of the fuel cell power generator 30, the above-mentionedReference examples andThe same parts as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0103]
The fuel cell power generator 30 is configured to discharge the electric power generated from the fuel cell 10 using the coil 34 and the IGBT 32 disposed in the subsequent stage of the IGBT 16 in the chopper 31. A load, a battery, and the like (not shown) are disposed at the subsequent stage of the chopper 31.
[0104]
In this fuel cell power generator 30, the system stop process is performed by controlling the operations of the first relay 15, the IGBT 16, and the IGBT 32 by a control unit (not shown).
[0105]
  "No.2 Reference examplesOperation of Fuel Cell Power Generation Device 30 According to
  FIG. 8 and FIG. 9 show the processing procedure of the first and second system stop processing of the control unit when the fuel cell system of the fuel cell power generator 30 is stopped.
[0106]
"First system stop process"
In step S41 in the first system stop process shown in FIG. 8, the control unit inputs a stop operation command for the fuel cell system, determines whether or not the stop operation sequence is performed, and the stop operation sequence is executed. If it is determined, the process proceeds to step S42. If it is determined that the stop operation sequence is not executed, the process of step S41 is repeatedly executed.
[0107]
In step S <b> 42, the control unit controls the two first relays 15 a and 15 b of the relay box 11 to an on state that closes the first relays 15 a and 15 b. Further, the control unit starts the discharge by operating the IGBT 16 and the IGBT 32 of the chopper 31, causing a current to flow through the coil 34 and storing it as energy in the coil 34.
[0108]
In step S43, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and if the voltage of the fuel cell 10 becomes smaller than a predetermined voltage, for example, a lower limit voltage value determined for the fuel cell 10. The process proceeds to step S44, and when the voltage of the fuel cell 10 is higher than the predetermined voltage, the operation of step S42 is maintained and the discharge is continued.
[0109]
In step S44, the control unit turns off the first relay 15 and turns off the IGBTs 16 and 32 of the chopper 31 and ends the discharge operation in the coil 34.
[0110]
In step S45, the control unit ends the stop operation sequence of the fuel cell system.
[0111]
The fuel cell power generator 30 that operates in accordance with the first system stop process as described above supplies the fuel cell current to the coil 34 that is inevitably provided in the chopper 31 to perform the discharge process, thereby reducing the size of the apparatus. And cost reduction.
[0112]
"Second system stop process"
In step S51 in the second system stop process shown in FIG. 9, the control unit receives a stop operation command for the fuel cell system, determines whether the stop operation sequence is performed, and the stop operation sequence is executed. If it is determined, the process proceeds to step S52, and if it is determined that the stop operation sequence is not executed, the process of step S51 is repeatedly executed.
[0113]
In step S <b> 52, the control unit controls the two first relays 15 a and 15 b of the relay box 11 to be in an on state in which they are closed. Further, the control unit operates the IGBT 16 and the IGBT 32 of the chopper 31 by intermittent duty control, causes a current to flow through the coil 34, and starts discharging by storing the energy in the coil 34.
[0114]
In the next step S53, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, so that the voltage of the fuel cell 10 becomes equal to or higher than a certain voltage value, for example, the lower limit voltage value of the fuel cell 10. The output of the IGBT 16 and IGBT 32 of the chopper 31 is controlled. That is, the control unit controls the duty ratio of the alternating current output from the IGBT 16 and the IGBT 32 to vary the value of the current flowing through the coil 34.
[0115]
In step S54, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the predetermined set value with the detected fuel cell current value. If the detected fuel cell current is less than or equal to the set value, the process proceeds to step S55. If it is greater than or equal to the set value, the process returns to step S53.
[0116]
This step S54 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination varies depending on the system in which the fuel cell power generation device 30 is mounted.
[0117]
In step S55, the control unit turns off the first relay 15 and turns off the IGBTs 16 and 32 of the chopper 31 and ends the discharge operation in the coil 34.
[0118]
In step S56, the control unit ends the stop operation sequence of the fuel cell system.
[0119]
In the fuel cell power generator 30 that operates according to the second system stop process, the current flowing through the coil 34 is controlled by duty control for controlling the duty ratio of the IGBT 16 and the IGBT 32, so that rapid and reliable discharge is performed. Can do.
[0120]
  [No.2Configuration of Fuel Cell Power Generation Device 40 According to Embodiment]
  In FIG.2A configuration of a fuel cell power generator 40 to which the present invention is applied will be described as an embodiment. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0121]
  The fuel cell power generator 40 is the secondReference exampleAnd an inverter 41 in which an auxiliary motor IGBT 42 and an IGBT 43 are added to the inverter 21 and an auxiliary motor 44 connected to the IGBT 42 and the IGBT 43 are added to the fuel cell power generator 20 shown as It has become. This first2In the embodiment, in particular, the motor 24 is a power motor 24 that is a power source of the fuel cell system.
[0123]
Unlike the power motor 24 that functions as an operation motor, the auxiliary motor 44 is a motor that drives other functional units constituting the system when the fuel cell power generation device 40 is mounted on, for example, a fuel cell vehicle system. is there.
[0124]
In addition, the fuel cell power generation device 40 is provided with a control unit that controls each part, and this control unit, for example, when the fuel cell power generation device 40 is mounted on a fuel cell vehicle system or the like, Control all over.
[0125]
  "No.2Operation of Fuel Cell Power Generation Device 40 According to Embodiment]
  FIG. 11 shows a processing procedure of the system stop process of the control unit when the fuel cell system of the fuel cell power generator 40 is stopped.
[0126]
In step S61, the control unit inputs a stop operation command for the fuel cell system, determines whether the stop operation sequence is performed, and if it is determined that the stop operation sequence is being executed, the process proceeds to step S62. If it is determined that the stop operation sequence has not been executed, the process of step S61 is repeated.
[0127]
  In step S62, the control unit controls the two first relays 15a and 15b of the relay box 11 to an on state in which they are closed. Further, the control unit operates the IGBT 16 of the chopper 12 and further controls the inverter 41.For power motor 24IGBT22as well asIGBT23,For auxiliary motor 44The IGBT 42 and the IGBT 43 are operated by intermittent duty control, and the power motor 24 and the auxiliary motor 44 are energized to start discharging.
[0128]
In the next step S63, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is equal to or higher than a certain voltage value, for example, the lower limit voltage value determined for the fuel cell 10. The duty ratio of the outputs of the IGBT 22, IGBT 23, IGBT 42, and IGBT 43 of the inverter 41 is controlled so that At this time, the duty ratio of the outputs of the IGBT 22, IGBT 23, IGBT 42, and IGBT 43 is controlled so that a current that can generate torque flows in the auxiliary motor 44 so that no torque is generated in the power motor 24.
[0129]
In step S64, the control unit determines whether or not torque is generated in the auxiliary motor 44 and the power motor 24 by a sensor (not shown). If torque is generated, the process proceeds to step S65. If no has occurred, the process proceeds to step S68.
[0130]
In step S65, since the torque is generated in the power motor 24 and the auxiliary motor 44, the control unit controls the duty ratio of the output from the IGBT 22, IGBT 23, IGBT 42, and IGBT 43 of the inverter 41 to control the power motor 24 and the auxiliary motor 44. The value of the current flowing through the machine motor 44 is reduced to stop the generation of torque. That is, the control means of the power motor 24 and the auxiliary motor 44 is changed from constant current control to constant voltage control.
[0131]
In the next step S66, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is smaller than a predetermined voltage, for example, a lower limit voltage value determined for the fuel cell 10. If no more, the process proceeds to step S67. If the voltage of the fuel cell 10 is smaller than the predetermined voltage, the process returns to step S63, and the power motor 24 and the auxiliary motor 44 continue to be discharged.
[0132]
In the next step S67, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the voltage of the fuel cell 10 is a certain voltage value, for example, the lower limit voltage value or more determined for the fuel cell 10. The duty ratio of the outputs of the IGBT 22, IGBT 23, IGBT 42, and IGBT 43 of the inverter 41 is controlled so that That is, the control unit controls the duty ratio of the alternating current output from the IGBT 22, IGBT 23, IGBT 42, and IGBT 43 to vary the value of the current flowing through the power motor 24 and the auxiliary motor 44.
[0133]
In the next step S68, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the detected fuel cell current value with a predetermined set value. The controller proceeds to step S69 if the detected fuel cell current is equal to or less than the set value, and returns to step S63 if greater than the set value.
[0134]
This step S68 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination varies depending on the system in which the fuel cell power generator 1 is mounted.
[0135]
In step S69, the control unit turns off the first relay 15 and turns off the IGBT 16 of the chopper 12 and the IGBTs 22, IGBT 23, IGBT 42, and IGBT 43 of the inverter 41, and turns off the power motor 24. And the discharge operation in the auxiliary machine motor 44 is terminated.
[0136]
In step S70, the control unit ends the stop operation sequence of the fuel cell system.
[0137]
The fuel cell power generation apparatus 40 that operates according to such a system stop process can realize a reduction in size and cost of the apparatus by performing a discharge process in both the power motor 24 and the auxiliary motor 44, and further provides torque control. By performing this and generating torque in the auxiliary motor 44, discharge of residual hydrogen can be executed safely and efficiently.
[0138]
The control unit can arbitrarily change the current consumption ratio between the power motor 24 and the auxiliary motor 44 between 0% and 100% in the motor 24 / auxiliary motor 44.
[0139]
Further, the control unit may determine the motor that gives torque and the motor that does not give torque by the system. For example, torque is not generated in the power motor 24, but torque is generated in the auxiliary motor 44 such as an air intake compressor motor or a cooling medium circulation motor according to the system status.
[0140]
Furthermore, according to the fuel cell power generator 40, no torque is generated in the power motor 24, so that the possibility of the power motor 24 operating unexpectedly when the system is stopped can be eliminated, and safety can be improved.
[0141]
  [No.3Configuration of Fuel Cell Power Generation Device 50 According to Embodiment]
  Fig. 12, No.3The structure of the fuel cell power generator 50 to which the present invention is applied is shown as an embodiment. Note that the above-mentionedReference examples andThe same parts as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0142]
  The fuel cell power generator 50One embodimentIn this configuration, a DC / DC converter 51, a battery 52, and a cooling pump 53 are added to the fuel cell power generation apparatus 20 shown as.
[0143]
The DC / DC converter 51 converts a direct current into a predetermined voltage and supplies it to the subsequent cooling pump 53.
[0144]
The cooling pump 53 is a pump for cooling the motor 24. The cooling pump 53 energizes the internal motor in accordance with the voltage from the DC / DC converter 51 and supplies cooling water corresponding to the driving amount of the internal motor to the motor 24. Here, the cooling pump 53 is used as a device operated by the DC / DC converter 51, but any device that operates with a direct current may be used.
[0145]
Further, the fuel cell power generation device 50 is provided with a control unit that controls the fuel cell power generation device 20, and for example, when the fuel cell power generation device 50 is mounted on a fuel cell vehicle system or the like, Centrally control the fuel cell vehicle system.
[0146]
  The first3In the fuel cell power generation device 50 according to the embodiment, an inverter 41 having a configuration as shown in FIG. 10 may be provided instead of the inverter 21, and an auxiliary motor may be provided to drive another auxiliary machine of the cooling pump 53. .
[0147]
  "No.3Operation of Fuel Cell Power Generation Device 50 According to Embodiment]
  Next, the operation of the fuel cell power generator 50 will be described using the flowchart shown in FIG.
[0148]
In step S71, the control unit inputs a stop operation command for the fuel cell system, determines whether the stop operation sequence is performed, and if it is determined that the stop operation sequence is being executed, the process proceeds to step S72. If it is determined that the stop operation sequence has not been executed, the process of step S71 is repeatedly executed.
[0149]
In step S <b> 72, the control unit controls the two first relays 15 a and 15 b of the relay box 11 to be in an on state in which they are closed. Further, the control unit operates the IGBT 16, the DC / DC converter 51, and the cooling pump 53 of the chopper 12. Further, the IGBT 22 and IGBT 23 of the inverter 21 are operated by duty control.
[0150]
Thereby, in the fuel cell power generation device 50, the electric power from the DC / DC converter 51 is accumulated in the battery 52, supplied to the cooling pump 53, and the cooling pump 53 and the motor 24 are energized to start discharging.
[0151]
In the next step S73, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17 so that the voltage of the fuel cell 10 becomes equal to or higher than a certain voltage value, for example, the lower limit voltage value of the fuel cell 10. The output duty ratio of the IGBT 22 and IGBT 23 of the inverter 21 is controlled. That is, the control unit controls the duty ratio of the alternating current output from the IGBT 22 and the IGBT 23 to vary the value of the current flowing through the motor 24.
[0152]
In step S73, the control unit performs duty control on the IGBT 22 and the IGBT 23 so that the motor 24 does not generate torque, and controls the DC / DC converter 51 so that the cooling pump 53 generates torque.
[0153]
In the next step S74, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the detected fuel cell current value with a predetermined set value. The controller proceeds to step S75 if the detected fuel cell current is equal to or less than the set value, and returns to step S73 if greater than the set value.
[0154]
This step S74 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination differs depending on the system in which the fuel cell power generation device 50 is mounted.
[0155]
In step S75, the control unit turns off the first relay 15 and turns off the IGBT 16 of the chopper 12, the IGBTs 22 and IGBTs 23 of the inverter 21, and turns off the motor 24, DC / DC converter. The operation of 51 and the cooling pump 53 is stopped and the discharge operation is terminated.
[0156]
In step S76, the control unit ends the stop operation sequence of the fuel cell system.
[0157]
In the fuel cell power generation device 50 that operates according to such a system stop process, not only the motor 24 but also the DC / DC converter 51 is operated to drive the battery 52 and / or the cooling pump 53 to remove residual hydrogen in the fuel cell 10. By performing the discharge process, an efficient discharge process can be performed.
[0158]
Further, according to the fuel cell power generation device 50, since the torque is generated by the cooling pump 53 without generating torque in the motor 24, the possibility of the motor 24 unexpectedly operating when the system is stopped is eliminated, and safety is improved. Can be increased.
[0159]
  [No.4Configuration of Fuel Cell Power Generation Device 60 According to Embodiment]
  In FIG.4A configuration of a fuel cell power generator 60 to which the present invention is applied will be described as an embodiment. Note that the above-mentionedReference examples andThe same parts as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0160]
  The fuel cell power generator 603In place of the chopper 12 in the fuel cell power generator 50 shown as the embodiment, the first2 Reference examplesThe chopper 61 having a configuration in which the current sensor 18 and the coil 34 are removed from the chopper 31 of the fuel cell power generation apparatus 30 shown as follows, and further, a relay box 62 including two relays 63 and a secondary battery 64 are provided. It has an added configuration.
[0161]
Further, the fuel cell power generation device 60 is provided with a control unit that controls the fuel cell power generation device 60. When the fuel cell power generation device 60 is mounted on a fuel cell vehicle system or the like, for example, Centrally control the fuel cell vehicle system.
[0162]
  The first3In the fuel cell power generation device 50 according to the embodiment, an inverter 41 having a configuration as shown in FIG. 10 may be provided instead of the inverter 21, and an auxiliary motor may be provided to drive another auxiliary machine of the cooling pump 53. .
[0163]
  "No.4Operation of Fuel Cell Power Generation Device 60 According to Embodiment]
  Next, the operation of the fuel cell power generator 60 will be described using the flowchart shown in FIG.
[0164]
In step S81, the control unit inputs a stop operation command for the fuel cell system, determines whether or not the stop operation sequence is being performed, and if it is determined that the stop operation sequence is being executed, the process proceeds to step S82. If it is determined that the stop operation sequence has not been executed, the process of step S81 is repeatedly executed.
[0165]
In step S82, the control unit detects the storage rate (SOC) of the secondary battery 64 detected by a sensor (not shown), and determines whether or not the battery is fully charged. If not fully charged, the process proceeds to step S83, and if fully charged, the process proceeds to step S87.
[0166]
In step S83, the control unit controls the two first relays 15a and 15b of the relay box 11 and the two relays 63 of the relay box 62 to be in an on state. Further, the control unit operates the IGBT 16 of the chopper 12 by performing duty control. At the same time, the control unit opens the IGBTs 22 and 23 of the inverter 21, stops the operation of the DC / DC converter 51 and the cooling pump 53, and starts discharging by charging the secondary battery 64.
[0167]
In the next step S84, the control unit detects the amount of power stored in the secondary battery 64 detected by a sensor (not shown), and determines whether or not the battery is fully charged. If not fully charged, the process proceeds to step S85, and if fully charged, the process proceeds to step S87.
[0168]
In step S85, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, and the chopper so that the voltage of the fuel cell 10 becomes a certain voltage value, for example, the lower limit voltage value of the fuel cell 10 or more. The output of 61 IGBT16, IGBT32 of 61 is controlled, and current adjustment and voltage adjustment are carried out.
[0169]
In step S86, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the detected fuel cell current value with a predetermined set value. When the detected fuel cell current is equal to or less than the set value, the control unit proceeds to step S90, and when it is equal to or greater than the set value, the control unit returns the process to step S84.
[0170]
In step S87, the control unit controls the two first relays 15a and 15b of the relay box 11 to an on state in which they are closed. Further, the control unit operates the IGBT 16 of the chopper 61, operates the DC / DC converter 51, and operates the cooling pump 53. Further, the control unit operates the IGBTs 22 and 23 of the inverter 21 by performing duty control, and starts discharging by energizing the motor 24. Furthermore, the control unit turns off the two relays 63 of the relay box 62 and stops the power accumulation in the secondary battery 64.
[0171]
As a result, the fuel cell power generator 60 does not charge the secondary battery 64 because the SOC is 100% or more, and discharges the motor 24 and / or the cooling pump 53.
[0172]
In the next step S88, the control unit detects the voltage of the fuel cell 10 detected by the voltage sensor 17, so that the voltage of the fuel cell 10 becomes equal to or higher than a certain voltage value, for example, the lower limit voltage value of the fuel cell 10. The output duty ratio of the IGBT 22 and IGBT 23 of the inverter 21 is controlled. That is, the control unit controls the duty ratio of the alternating current output from the IGBTs 22 and 23 to vary the value of the current flowing through the motor 24.
[0173]
In the next step S89, the control unit detects the fuel cell current output from the fuel cell 10 detected by the current sensor 18, and compares the predetermined set value with the detected fuel cell current value. When the detected fuel cell current is equal to or less than the set value, the control unit proceeds to step S90, and when it is equal to or greater than the set value, the control unit returns the process to step S88.
[0174]
This step S89 is a process for making a determination for terminating the discharge operation of the fuel cell 10, and the set value serving as a reference for the determination varies depending on the system in which the fuel cell power generator 60 is mounted.
[0175]
In step S90, the control unit turns off the first relay 15 of the relay box 11 and the relay 63 of the relay box 62, and also opens the IGBTs 16 and 32 of the chopper 61 and the IGBTs 22 and 23 of the inverter 21. The power supply to the motor 24, the operation of the DC / DC converter 51, and the cooling pump 53 are stopped, and the discharge operation is terminated.
[0176]
In step S91, the control unit ends the stop operation sequence of the fuel cell system.
[0177]
In the fuel cell power generation device 60 that operates according to such a system stop process, a secondary battery is added to the fuel cell power generation device 50, and the secondary battery performs the discharge process of the fuel cell 10 to effectively use energy. be able to.
[0178]
The current consumption ratio between the motor 24 and the auxiliary motor 44 can be arbitrarily changed between 0% and 100% in the motor 24 / auxiliary motor 44.
[0179]
  [Another embodiment to which the present invention is applied]
  As described above, the first embodiment to the first embodiment to which the present invention is applied.4In the embodiment, the discharge treatment for removing residual hydrogen has been described.The first embodiment to the fourth embodiment to which the present invention is appliedThe present invention may be applied when removing hydrogen generated by the fuel reformer after the operation of the system equipped with any one of the fuel cell power generators is stopped.
[0180]
  For example, as shown in FIG. 16, a fuel reformer equipped with a reforming reaction section 71, a CO removal section 72, and a combustion section 73.WhereIt is assumed that the fuel cell 10 is connected. Fuel reformerIn placeThe fuel tank 74 is supplied with fuel such as natural gas or methanol.
[0181]
  From fuel tank 74Reforming reactorThe fuel supplied to 71 is reformed to hydrogen by the reforming reaction unit 71, CO is removed by the CO removing unit 72, and hydrogen from which CO has been removed is supplied to the fuel cell 10. Hydrogen that has not been used in the fuel cell 10 is returned to the fuel reformer 71 again, burned in the combustion section 73, and exhausted.
[0182]
  Such a fuel reformerIn placeDuring the system shutdown process sequenceapparatusIn order to process the fuel remaining in the interior or piping, the reforming reaction unit 71 reforms the hydrogen to generate hydrogen.
[0183]
  Fuel reformer during system shutdown process sequenceIn placeThe generated hydrogen is supplied to the fuel cell 10 and described above.The first embodiment to the fourth embodiment to which the present invention is appliedThe discharge treatment can be performed by the fuel cell power generator.
[0184]
  17 and 18, in the case where hydrogen is directly supplied from the hydrogen storage device 75 to the fuel cell 10,The first embodiment to the fourth embodiment to which the present invention is appliedWhen a system equipped with one of the fuel cell power generation devices shifts to the stop operation sequence, hydrogen that has not been used in the fuel cell 10 is as described above.The first embodiment to the fourth embodiment to which the present invention is appliedThe discharge treatment can be performed by the fuel cell power generator.
[0185]
The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.
[Brief description of the drawings]
FIG. 1 shows the first of the present invention.Reference exampleIt is a block diagram for demonstrating the principal part structure of the fuel cell power generator shown as.
FIG. 2 is a flowchart for explaining a discharge treatment operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 3 shows the first aspect of the present invention.1It is a block diagram for demonstrating the principal part structure of the fuel cell power generator shown as this embodiment.
FIG. 4 is a flowchart for explaining a first discharge processing operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 5 is a flowchart for explaining a second discharge processing operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 6 is a flowchart for explaining a third discharge processing operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 7 shows the first of the present invention.2 Reference examplesIt is a block diagram for demonstrating the principal part structure of the fuel cell power generator shown as.
FIG. 8 is a flowchart for explaining a first discharge processing operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 9 is a flowchart for explaining a second discharge treatment operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 10 shows the first of the present invention.2It is a block diagram for demonstrating the principal part structure of the fuel cell power generator shown as this embodiment.
FIG. 11 is a flowchart for explaining a discharge treatment operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 12 shows the first of the present invention.3It is a block diagram for demonstrating the principal part structure of the fuel cell power generator shown as this embodiment.
FIG. 13 is a flowchart for explaining a discharge treatment operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 14 shows the first of the present invention.4It is a block diagram for demonstrating the principal part structure of the fuel cell power generator shown as this embodiment.
FIG. 15 is a flowchart for explaining a discharge treatment operation of hydrogen remaining in the fuel cell of the fuel cell power generator.
FIG. 16 is a block diagram for explaining a main configuration of the fuel reformer.
FIG. 17 is a first block diagram for explaining how hydrogen is directly supplied to a fuel cell in the fuel cell power generator shown as an embodiment of the present invention.
FIG. 18 is a second block diagram for explaining how hydrogen is directly supplied to the fuel cell in the fuel cell power generator shown as an embodiment of the present invention.
FIG. 19 is a block diagram for explaining a main configuration of a fuel cell power generator shown as a conventional technique.
[Explanation of symbols]
1, 20, 30, 40, 50, 60 Fuel cell power generator
10 Fuel cell
11 Relay box
12 Chopper
13 Second relay
14 Discharge resistance
15 1st relay
16 IGBT
17 Voltage sensor
18 Current sensor
21 Inverter
22 IGBT
23 IGBT
24 Power motor
32 IGBT
31 Chopper
34 coils
41 Inverter
42 IGBT
43 IGBT
44 Auxiliary motor
51 DC / DC converter
52 Battery 53 Cooling pump
61 Chopper
62 Relay box
63 Relay
64 Secondary battery

Claims (8)

A fuel cell power generator mounted on a vehicle,
It consists of a plurality of fuel cell structures in which a fuel cell structure with a fuel electrode and an oxidizer electrode sandwiched between electrolyte membranes is sandwiched by separators, and electrically connects hydrogen contained in fuel gas and oxygen in the air. A fuel cell that generates electricity through chemical reaction;
A chopper provided on the output side of the fuel cell, which converts the electric power generated by the fuel cell into a direct current and outputs it;
An inverter that is provided on the output side of the chopper, converts the direct current output from the chopper into an alternating current, and outputs the alternating current;
A motor that is provided on the output side of the inverter and discharges the alternating current output from the inverter;
A current sensor for detecting an output current value of the fuel cell;
A voltage sensor for detecting the output voltage value of the fuel cell;
When the power generation of the fuel cell is stopped, the voltage is generated until the output current of the fuel cell detected by the current sensor is not more than a predetermined value by generating power with the oxidant gas and the fuel gas remaining in the fuel cell. Control means for controlling the inverter to supply an alternating current to the motor so that the output current detected by the sensor is constant, and supplying the alternating current to the motor;
The motor includes a motor circuit having a power motor that generates power for the vehicle to travel, and the control means generates power with the oxidant gas and fuel gas remaining in the fuel cell and is detected by the voltage sensor. Detecting the output voltage value of the fuel cell, changing the alternating current output from the inverter so that the output voltage value of the fuel cell becomes a constant voltage value, causing the alternating current to be consumed by the power motor ; determining whether the upper SL has a torque generated in the power motor, if the torque is generated, and the alternating current not generating a torque to the power motor, causing the alternating current consumed by the power motor A fuel cell power generator. An auxiliary motor for driving an auxiliary machine used to drive the power motor;
The inverter comprises a power motor semiconductor switching element that converts AC current supplied to the power motor and an auxiliary motor semiconductor switching element that converts AC current supplied to the auxiliary motor. The fuel cell power generator according to claim 1. An auxiliary machine ,
2. The fuel cell according to claim 1, further comprising a DC / DC converter provided on the output side of the chopper , which converts a DC voltage output from the chopper and supplies the converted voltage to the auxiliary machine. Power generation device. The said control means controls the said inverter so that it may be set as the alternating current value from which the said power motor does not operate | move, and controls a DC / DC converter so that the said auxiliary machine may be operated. Fuel cell power generator. Together provided with a plurality of motors including the power motor as the motor, the fuel cell power plant of any one of claims 1 to 4, characterized in that it comprises a plurality of said inverters. A reforming reaction section for reforming a predetermined fuel and taking out hydrogen supplied to the fuel cell;
The fuel according to any one of claims 1 to 5, wherein a fuel gas taken out by the reforming reaction section from the residue of the predetermined fuel is supplied to the fuel cell, and is generated and discharged. Battery power generator. A secondary battery for accumulating electric power generated by the fuel cell;
Provided on the output side of the chopper, the direct current output from the chopper according to one of claims 1 to 5, characterized by further comprising a relay box supplied to the secondary battery Fuel cell power generator. A sensor for detecting a storage rate of the secondary battery ;
The control means controls the relay box so that the secondary battery is charged based on the accumulation rate detected by the sensor, and charges the secondary battery based on the accumulation rate detected by the sensor. 8. The fuel cell power generator according to claim 7, wherein the relay box is controlled so as to stop the accumulation of power in the secondary battery in a charged state .

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