WO2012063300A1

WO2012063300A1 - Fuel cell output control device

Info

Publication number: WO2012063300A1
Application number: PCT/JP2010/069819
Authority: WO
Inventors: 智彦金子
Original assignee: トヨタ自動車株式会社
Priority date: 2010-11-08
Filing date: 2010-11-08
Publication date: 2012-05-18

Abstract

[Problem] To achieve output control for a high-response fuel cell even with a variety of power generation requirements. [Solution] Power control that controls the output power of a fuel cell (2) when that fuel cell (2) is operated normally or when there are rapid power generation requirements at a target power and voltage control that controls the output voltage of the fuel cell (2) to a target voltage when rapid warm-up of the fuel cell (2) is required are switchable. For example, calculation sections (61, 62) that calculate duty instruction values provided to a boost converter (5), which boosts the output voltage of the fuel cell 2 and outputs to the load side, are provided. Either a first duty instruction value calculated using the output power and target power for the fuel cell (2) or a second duty instruction value calculated using the output voltage and target voltage for the fuel cell (2) is provided to the boost converter (5).

Description

Fuel cell output control device

The present invention relates to an output control device for a fuel cell.

As a power supply system used for a fuel cell vehicle, for example, a technique disclosed in Japanese Patent No. 4163222 is known. In this power supply system, the current of the fuel cell is controlled by a boost converter disposed at the subsequent stage of the fuel cell.

Japanese Patent No. 4163222

By the way, in the case of rapid warm-up required at the time of starting the fuel cell when, for example, the outside air temperature drops below the freezing point, it is necessary to directly control the output voltage of the fuel cell to control the target voltage. Although it is desirable for shortening, the control method of Patent Document 1 cannot directly control the output voltage of the fuel cell, and a voltage-current conversion map showing the relationship between the output voltage and the output current of the fuel cell. Is required. In addition, since the relationship between the voltage and the current changes every moment depending on the operating state of the fuel cell, it is difficult to accurately and quickly respond to the demand for rapid warm-up.

Further, in the control method of Patent Document 1, the output power of the fuel cell cannot be directly controlled. For example, when the fuel cell vehicle requires a rapid acceleration, the output power of the fuel cell cannot be quickly increased to the target power value. . For this reason, it may be necessary to supply power from a secondary power source such as a secondary battery in order to compensate for the shortage. In such a case, it is not preferable from the viewpoint of protecting the secondary battery that the amount of power supplied from the secondary power supply (the amount taken out) may be excessive and exceed the allowable power of the secondary power supply.

In this way, it may be preferable to directly control the output voltage of the fuel cell, for example, at the time of a quick warm-up request, for example, while at the time of a rapid acceleration request or normal (steady) operation, for example, From the viewpoint of energy management of the entire fuel cell system, it may be preferable to directly control the output power of the fuel cell.

The present invention has been made to solve the above-described problems caused by the prior art, and an object of the present invention is to make it possible to realize output control of a fuel cell that is highly responsive to various power generation requirements.

In order to solve the above-described problems, the present invention provides a power control apparatus for controlling the output power of a fuel cell so that the output power of the fuel cell becomes a target power during normal operation of the fuel cell or a request for rapid power generation. In addition, a configuration is adopted in which voltage control for controlling the output voltage of the fuel cell to be a target voltage when the fuel cell is required to be quickly warmed up can be switched.

Note that the rapid warm-up is an operation that is performed, for example, when the temperature of the power generation part is rapidly raised when the outside air temperature decreases to improve the startability. Specifically, this is an operation in which power generation is intentionally performed with less reactive gas supplied to the fuel cell compared to normal (steady) power generation, and power loss is large compared to normal power generation. It is realized by squeezing rather than.
During normal power generation, the fuel cell is operated with the air stoichiometric ratio set to a predetermined value or higher so that high power generation efficiency can be obtained while suppressing power loss.
In addition, when a rapid power generation request is made, for example, when the required power generation amount exceeds a predetermined threshold set in advance, such as when sudden acceleration is requested when the vehicle is mounted, or when the required power generation amount exceeds the output power of the fuel cell. Etc.

In the above configuration, a duty calculation unit is provided that calculates a duty command value to be given to a boost converter that boosts the output voltage of the fuel cell and outputs the boosted voltage to the load side, and is calculated using the output power and the target power of the fuel cell. In addition, any one of the first duty command value and the second duty command value calculated using the output voltage and the target voltage of the fuel cell may be provided to the boost converter.

In the above configuration, the duty calculation unit is configured to calculate the first duty command value using an output power change amount and a target power change amount obtained based on an output power and a target power of the fuel cell, respectively. May be.

In the above configuration, the duty calculation unit is configured to calculate the second duty command value using an output voltage change amount and a target voltage change amount respectively obtained based on an output voltage and a target voltage of the fuel cell. May be.

In the above configuration, as the duty command value to be given to the boost converter, the first duty command value is selected during the normal operation or when the rapid power generation is requested, and the second duty command value is selected when the rapid warm-up is requested. You may be comprised so that a control switching part may be provided.

In the above configuration, the boost converter may be configured to include a booster circuit having a plurality of phases and a correction logic for equalizing a reactor current flowing through the booster circuit in each phase.

In the above configuration, the correction logic corrects the duty command value according to a first calculation unit that calculates an average value of the reactor current flowing through each phase and a difference between the reactor current flowing through each phase and the average value. And a second calculation unit that calculates a value.

According to the present invention, it is possible to realize output control of a fuel cell that is highly responsive to various power generation requirements.

1 is a configuration diagram schematically showing one embodiment of an output control device for a fuel cell according to the present invention. FIG. It is a block diagram which shows 1st Embodiment of the duty calculating part of FIG. FIG. 2 is a block diagram illustrating an embodiment of a first boost converter of FIG. 1. FIG. 4 is a block diagram illustrating one embodiment of the correction logic of FIG. It is a block diagram which shows the 1st modification of the duty calculating part of FIG. It is a block diagram which shows the 2nd modification of the Duty calculating part of FIG. It is a block diagram which shows the 3rd modification of the duty calculating part of FIG. It is a block diagram which shows 2nd Embodiment of the duty calculating part of FIG. It is a block diagram which shows the 1st modification of the duty calculating part of FIG. It is a block diagram which shows the 2nd modification of the duty calculating part of FIG. It is a block diagram which shows the 3rd modification of the duty calculating part of FIG.

Hereinafter, an embodiment of a fuel cell system including a fuel cell output control device according to the present invention will be described with reference to the accompanying drawings. In the present embodiment, a case will be described in which this fuel cell system is further used as an on-vehicle power generation system of a fuel cell vehicle (FCHV; Fuel Cell Hybrid Vehicle).

First, the configuration of the fuel cell system will be described with reference to FIG.
As shown in FIG. 1, the fuel cell system 1 includes a fuel cell 2 that generates electric power by an electrochemical reaction between an oxidizing gas, which is a reaction gas, and the fuel gas. The power generation state of the fuel cell 2 is controlled by a control unit 11. Controlled by.

The fuel cell 2 is, for example, a polymer electrolyte fuel cell, and has a stack structure in which a large number of single cells are stacked. The single cell has an air electrode on one surface of an electrolyte composed of an ion exchange membrane, a fuel electrode on the other surface, and a structure having a pair of separators so as to sandwich the air electrode and the fuel electrode from both sides. It has become. The fuel cell 2 is provided with a voltage sensor Sv for detecting the output terminal voltage and a current sensor Si for detecting the output current.

Furthermore, a first boost converter 5 is connected to the fuel cell 2. The first boost converter 5 is a DC voltage converter, and has a function of adjusting the DC voltage input from the fuel cell 2 and outputting it to the inverter 4 side. A drive motor 6 is connected to the first boost converter 5 via an inverter 4, and a battery 9 as a secondary battery and various auxiliary machines 10 are connected via a second boost converter 8. Has been.

The second boost converter 8 is a DC voltage converter, and adjusts the DC voltage input from the battery 9 and outputs it to the inverter 4 side, and the DC voltage input from the fuel cell 2 or the drive motor 6. And adjusting the output to the battery 9. Such a function of the second boost converter 8 realizes charging / discharging of the battery 9.

The battery 9 is charged with surplus power obtained by stacking battery cells, using a constant high voltage as a terminal voltage, and drawing out the power consumed by the entire load including the drive motor 6 from the output power of the fuel cell 2. The drive motor 6 can be supplementarily supplied with electric power. If the battery 9 continues to be used in a region where the SOC (State Of Of Charge), which is the remaining capacity, is extremely high or low, there is a risk of deterioration. For this reason, it is preferable to directly control the output power of the fuel cell 2 when, for example, sudden acceleration is requested or during normal operation.

The drive motor 6 is a three-phase AC motor, for example, and constitutes a main power source of a fuel cell vehicle on which the fuel cell system 1 is mounted. The inverter 4 to which the drive motor 6 is connected converts a direct current into a three-phase alternating current and supplies it to the drive motor 6.

The control unit 11 is a higher-level control device that controls the operation of various devices in the system based on the operation amount of an acceleration operation member (accelerator or the like) provided in the fuel cell vehicle. Between the control unit 11 and the first boost converter 5, a duty calculation unit 12 for calculating a duty command value to be given to the first boost converter is provided. That is, the fuel cell output control apparatus according to the present invention includes the first boost converter 5, the control unit 11, and the duty calculation unit 12 in the present embodiment.

Next, the first embodiment of the duty calculation unit 12 shown in FIG. 1 will be described in detail with reference to FIG. In the duty calculation unit 12 according to the first embodiment, the first controller 15 related to power control of the fuel cell 2 and the second controller 16 related to voltage control of the fuel cell 2 are mutually connected. Connected in series.

The first controller 15 includes, as a positive component, an output power command value (hereinafter referred to as power command value P_ref) of the fuel cell 2 output from the control unit 11 which is a host control device, and the current sensor Si and The current value of the output power of the fuel cell 2 calculated from each output value of the voltage sensor Sv (hereinafter, the current power value P_mes) is input as a negative component.

In the first controller 15, a difference value between the power command value P_ref and the current power value P_mes (hereinafter referred to as a power difference value ΔP), that is, a power generation shortage amount with respect to the required power amount to the fuel cell 2, or this power difference value. A correction value for the output voltage of the fuel cell 2 based on ΔP (hereinafter, voltage correction value V_cor) is calculated and output to the second controller 16.

The second controller 16 includes the power difference value ΔP or the voltage correction value V_cor, and the output voltage command value (hereinafter referred to as voltage command value V_ref) of the fuel cell 2 output from the control unit 11 which is a higher-level control device. And the current value of the output voltage of the fuel cell 2 output from the voltage sensor Sv (hereinafter, voltage current value V_mes) is input as a negative component. That is, the second controller 16 receives the voltage difference value ΔV between the voltage command value V_ref and the current voltage value V_mes, and the power difference value ΔP output from the first controller 15 or the voltage correction value V_cor. Is done.
The second controller 16 outputs a duty command value for the first boost converter 5 based on these values.

In this embodiment, not only the input of both the power command value P_ref and the voltage command value V_ref can be accepted, but the output control of the fuel cell based on one of the command values can be performed. In other words, the power control for controlling the output power of the fuel cell 2 to be the target power and the voltage control for controlling the output voltage of the fuel cell 2 to be the target voltage can be switched.

For example, during normal (steady) operation or sudden acceleration (rapid power generation) request, the voltage command value V_ref and the current voltage value V_mes are forcibly set to zero, or the voltage command value V_ref is forcibly set to the same voltage current value V_mes. By setting the value, it becomes possible to perform the control of the energy management main body that controls the output power of the fuel cell 2 to the target value. On the other hand, for example, at the time of a rapid warm-up request, the first controller 15 By forcibly setting the output value to zero, the output voltage of the fuel cell 2 can be directly controlled to the target value.

By the way, in the first embodiment, in order to control the output power and output voltage of the fuel cell 2, the duty command value to be given to the first boost converter 5 is determined. If the converter is a multi-phase converter, even if the duty command value given to each phase is the same due to a slight difference in circuit impedance between each phase, the reactor current of each phase varies. Resulting in. In such a case, a surge voltage is generated at a higher level in a phase in which a relatively large current flows compared to the other phases, and a margin until breakdown is relatively reduced. .

Therefore, when using the first step-up converter 5 that has been made multiphase, it is preferable to configure, for example, the following in order to equalize the reactor current in each phase.
That is, a correction duty is calculated so that the currents actually flowing in the respective phases of the first boost converter 5 are equal to the duty command value output from the second controller 16, and this correction duty is calculated as the duty command. Add to the value.

Specifically, for example, as shown in FIG. 3, the first boost converter 5 has a reactor current value for each phase in addition to the U-phase, V-phase, and W-

phase boost circuits

51, 52, and 53.

Sensors

54, 55, 56 to be detected, and correction logic 57 for calculating the correction duty based on the reactor current values from these

sensors

54, 55, 56 are provided.
For example, as shown in FIG. 4, the correction logic 57 includes an averaging processing unit (first calculation unit) 571 and a PI control unit (second calculation unit) 572, and the reactor current in each phase The average value is calculated by the averaging processing unit 571, and the duty command value of the phase in which the reactor current larger than the average value is flowing is reduced by PI control (control in which proportional operation and integration operation are combined) in the PI control unit 572. To do.

In FIG. 4, only the portion related to the calculation of the correction duty for the U phase is shown, and the portion related to the calculation of the correction duty for the other V and W phases is omitted. In the V phase and the W phase, the correction duty is calculated by the averaging processing unit and the PI control unit as in the U phase. Further, although FIG. 4 illustrates three phases, the same configuration can be applied to any number of phases as long as the phases are plural.

According to the first boost converter 5 described above, the reactor current in each phase is equalized even when there is a slight difference in the circuit impedance between the phases while performing power control or voltage control of the fuel cell 2. Therefore, it is possible to suppress a relative margin decrease until breakdown due to a difference in circuit impedance and a variation in surge voltage.

The method for calculating the correction duty is not limited to the above method. For example, when the circuit impedance of each phase is measured at the time of factory shipment of the first boost converter and there is a phase having a higher impedance than the other phases. The duty command value to be given to the phase may be set in advance so as to be higher than the other phases. The setting in that case may be determined according to, for example, the distribution of the impedance of each phase.

<Modification of First Embodiment>
Next, a modification of the duty calculation unit 12 in the first embodiment will be described with reference to FIGS.
[First Modification]
As shown in FIG. 5, in the duty calculation unit 20 of the first modification, the power command value P_ref is input to the first controller 21 as a positive component, and the current power value P_mes is input as a negative component. The Up to this point, the process is the same as in the first embodiment.

However, in the first controller 21 of the present modification, the differential value of the power command value P_ref (hereinafter referred to as power differential command value Pdot_ref), that is, the amount of change per predetermined time of the power command value P_ref is calculated. Is output to the second controller 22. Then, the second controller 22 has the power differential command value Pdot_ref and the voltage command value Vref as positive components, and the differential value of the current power value Pmes (hereinafter, power differential current value Pdot_mes), that is, the power The change amount per predetermined time of the current value P_mes and the current voltage value V_mes from the voltage sensor Sv are input as negative components.

That is, the second controller 22 includes a power differential difference value ΔPdot, which is a difference value between the power differential command value Pdot_ref and the current power differential value Pdot_mes, and a differential value between the voltage command value V_ref and the current voltage value V_mes. Voltage difference value ΔV is input, and a duty command value for first boost converter 5 is output based on these values.

In this modification, compared with the first embodiment, the differential power value ΔPdot, which is the differential value, is input to the second controller 22 instead of the differential power value ΔP, and the duty command value is output. Therefore, it is possible to control the output of the fuel cell 2 with higher responsiveness particularly during normal operation or when sudden acceleration is requested.

[Second Modification]
As shown in FIG. 6, in the duty calculation unit 30 of the second modified example, the power command value P_ref is input to the first controller 15 as a positive component, and the current power value P_mes is input as a negative component. The The first controller 15 calculates a power difference value ΔP that is a difference value between the power command value P_ref and the current power value P_mes, or a correction value V_cor for the output voltage of the fuel cell 2 based on the power difference value ΔP. And output to the second controller 16. Up to this point, the process is the same as in the first embodiment.

However, the second controller 32 of the present modification includes a power differential value ΔP or a voltage correction value V_cor output from the first controller 15 and a differential value of the voltage command value V_ref (hereinafter, voltage differential command value). Vdot_ref), that is, the amount of change of the voltage command value V_ref per predetermined time is a positive component, and the differential value of the current voltage value V_mes (hereinafter, voltage differential current value Pdot_mes), that is, per predetermined time of the current voltage value V_mes. Are input as negative components.
That is, the second controller 32 receives the voltage difference value ΔP or the voltage correction value V_cor, and the voltage differential difference value ΔVdot that is the difference value between the voltage differential command value Vdot_ref and the voltage differential current value Vdot_mes. Based on this value, the duty command value for the first boost converter 5 is output.

In this modified example, the voltage differential difference value ΔVdot, which is a differential value, instead of the voltage difference value ΔV, which is a difference value between the voltage command value V_ref and the current voltage value V_mes, is compared with the first embodiment. Since the duty command value is output by being input to the second controller 32, output control of the fuel cell 2 with higher responsiveness is possible, for example, when a quick warm-up is requested.

[Third Modification]
As shown in FIG. 7, in the duty calculation unit 40 of the third modified example, the power command value P_ref is input to the first controller 21 as a positive component, and the current power value P_mes is input as a negative component. Based on these values, a power differential command value Pdot_ref is calculated and output to the second controller 42. Up to this point, it is the same as the first modification.

However, the second controller 42 of the present modification includes the power differentiation command value Pdot_ref and the voltage differentiation command value Vdot_ref output from the first controller 21 as positive components, for example, the first control. The power differential current value Pdot_mes and the voltage differential current value Pdot_mes output from the device 21 are input as negative components.
That is, the second controller 42 includes a power differential difference value ΔPdot that is a difference value between the power differential command value Pdot_ref and the current power differential value Pdot_mes, and a differential value between the voltage differential command value Vdot_ref and the voltage differential current value Vdot_mes. The voltage differential difference value ΔVdot is input, and a duty command value for the first boost converter is output based on these values.

In this modification, compared with the first embodiment and the first and second modifications, the power differential difference value ΔPdot and the voltage differential difference value ΔVdot are input to the second controller 42 and the duty command value is Since it is output, the output control of the fuel cell 2 having high responsiveness to various situations such as normal operation, rapid warm-up request, and rapid acceleration request becomes possible.

<Second Embodiment>
Next, the duty calculation unit 60 according to the second embodiment of the present invention will be described in detail with reference to FIG.

In the first embodiment, the first controller 15 related to the power control of the fuel cell 2 and the second controller 16 related to the voltage control of the fuel cell 2 are connected in series with each other. On the other hand, in the present embodiment, the two embodiments are different in that the first controller 61 and the second controller 62 are connected in parallel to each other.

The first controller 61 in the present embodiment receives the power command value V_ref as a positive component and the current power value P_mes as a negative component. That is, the first controller 61 receives a power difference value ΔP that is a difference value between the power command value P_ref and the current power value P_mes, in other words, a power generation shortage amount with respect to the required power amount for the fuel cell 2. . Up to this point, the process is the same as in the first embodiment.
However, the first controller 61 in the present embodiment is different from the first embodiment in that it outputs a first duty command value for the first boost converter 5 based on the power difference value ΔP. .

Also, the voltage controller value V_ref is input as a positive component and the current voltage value V_mes is input as a negative component to the second controller 62 in the present embodiment. In other words, the second controller 62 receives a voltage difference value ΔV that is a difference value between the voltage command value V_ref and the current voltage value V_mes, and the second controller 62 outputs a voltage difference value ΔV to the first boost converter 5 based on the voltage difference value ΔV. 2 Duty command value is output.

A switch (control switching unit) 63 is provided downstream (downstream) of the first controller 61 and the second controller 62. The switch 63 is for selecting a final duty command value to be given to the first boost converter 5, and it is preferable to control the power of the fuel cell 2, for example, during normal operation or when sudden acceleration is requested. It is preferable to select the first duty command value output from the first controller 61 and to control the voltage of the fuel cell 2. For example, when a rapid warm-up request is requested, the second duty output value is output from the second controller 62. For example, the switching operation is controlled based on a switching command from the control unit 11, which is a higher-level control device, so as to select the duty command value.

Also in this embodiment, not only can the input of both the power command value P_ref and the voltage command value V_ref be accepted, but the output control of the fuel cell 2 based on one of the command values can be performed. Accordingly, for example, during normal operation or when sudden acceleration is requested, it is possible to select and execute the control of the energy management entity that controls the output power of the fuel cell 2 to the target value, while for example, when requesting rapid warm-up, Control for directly controlling the output voltage of the fuel cell 2 to the target value can be selected and executed.

<Modification of Second Embodiment>
Also in the second embodiment, it is possible to apply a modification similar to the modification of the first embodiment.

[First Modification]
As shown in FIG. 9, in the duty calculation unit 70 according to the first modified example, the first controller 71 receives the power differentiation command value Pdot_ref as a positive component and the power differentiation current value Pdot_mes as a negative component. Based on these values, the first duty command value for the first boost converter 5 is output. Similarly to the second embodiment, the second controller 62 receives the voltage command value P_ref as a positive component and the current voltage value P_mes as a negative component. Based on these values, the first controller 62 A second duty command value for boost converter 5 is output.

In this modification, compared with the second embodiment, the power differential difference value ΔPdot that is a differential value of the power difference value ΔPdot that is the difference value between the power command value P_ref and the current power value P_mes is the first difference. Since the first duty command value is output to the first controller 71 and the first duty command value is selected at the time of normal operation or sudden acceleration request, a fuel cell with higher responsiveness is selected. 2 output control becomes possible.

[Second Modification]
As shown in FIG. 10, in the duty calculation unit 80 according to the second modification, the first controller 61 receives the power command value P_ref as a positive component and the current power value P_mes, as in the second embodiment. Is input as a negative component, and the first duty command value for the first boost converter 5 is output based on these values. However, the second controller 82 is supplied with the voltage differentiation command value Pdot_ref as a positive component and the voltage differentiation current value Pdot_mes as a negative component. Based on these values, the second controller 82 supplies the second differential with respect to the first boost converter 5. The duty command value is output.

In this modified example, as compared with the second embodiment, a voltage differential difference value ΔVdot which is a differential value of the voltage difference value ΔPdot which is a difference value between the voltage command value V_ref and the current voltage value V_mes is a second value. Therefore, when the second duty command value is selected at the time of a quick warm-up request, for example, the output of the fuel cell 2 with higher response is output. Control becomes possible.

[Third Modification]
As shown in FIG. 11, in the duty calculation unit 90 according to the third modified example, the first controller 71 has the power differential command value Pdot_ref as a positive component and the power differential current as in the first modified example. The value Pdot_mes is input as a negative component, and a first duty command value for the first boost converter 5 is output based on these values. Similarly to the second modified example, the second controller 82 receives the voltage differentiation command value Pdot_ref as a positive component and the voltage differentiation current value Pdot_mes as a negative component, and the first controller based on these values. The second duty command value for the step-up converter 5 is output.

In this modified example, compared with the second embodiment and the first and second modified examples, a power differential difference value ΔPdot which is a differential value between the power differential command value Pdot_ref and the current power differential value Pdot_mes, and a voltage differential command A voltage differential difference value ΔVdot, which is a difference value between the value Pdot_ref and the voltage differential current value Pdot_mes, is input to the first controller 71 and the second controller 82, respectively, and the first duty command value or the second duty Since either one of these is selected and output, output control of the fuel cell 2 with high responsiveness according to various operating states of the fuel cell 2 such as normal operation, rapid warm-up request, and rapid acceleration request Is possible.

In the above-described second embodiment and the first to third modifications thereof, the various differential values have been described only for the single differential value, but the number of differential operations may be any plural number.

Further, in the above-described embodiment, the case where the fuel cell output control device according to the present invention is mounted on a fuel cell vehicle has been described, but various mobile bodies other than the fuel cell vehicle (robot, ship, aircraft, etc.) The fuel cell output control apparatus according to the present invention can also be applied. Further, the present invention can also be applied to an output control device for a fuel cell according to the present invention and a stationary power generation system used as power generation equipment for buildings (housing, buildings, etc.).

DESCRIPTION OF SYMBOLS 1 ... Fuel cell system, 2 ... Fuel cell, 4 ... Inverter, 5 ... 1st boost converter, 6 ... Drive motor, 8 ... 2nd boost converter, 9 ... Battery, 10 ... Auxiliary machine, 11 ... Control part, 12, 20, 30, 40, 60, 70, 80, 90 ... Duty calculation unit, ... first controller, ... second controller, 51, 52, 53 ... each booster circuit, 54, 55, 56 ... Sensor 57... Correction logic 63 Switch (control switching unit) 571 Averaging processing unit (first arithmetic unit) 572 PI controller (second arithmetic unit)

Claims

An apparatus for controlling the output of a fuel cell,
Power control for controlling the output power of the fuel cell to be a target power at the time of normal operation of the fuel cell or a request for rapid power generation, and the output voltage of the fuel cell at a target voltage when a rapid warm-up request is requested An output control device for a fuel cell, which can be switched between voltage control to be controlled to be
In the fuel cell output control device according to claim 1,
A duty calculation unit for calculating a duty command value to be given to a boost converter that boosts the output voltage of the fuel cell and outputs the boosted voltage to the load side;
One of the first duty command value calculated using the output power and target power of the fuel cell and the second duty command value calculated using the output voltage and target voltage of the fuel cell is the A fuel cell output control device applied to a boost converter.
In the fuel cell output control device according to claim 2,
The duty calculation unit is a fuel cell output control device that calculates the first duty command value by using an output power change amount and a target power change amount respectively obtained based on an output power and a target power of the fuel cell.
In the fuel cell output control device according to claim 2,
The duty calculation unit is a fuel cell output control device that calculates the second duty command value using an output voltage change amount and a target voltage change amount respectively obtained based on an output voltage and a target voltage of the fuel cell.
In the fuel cell output control device according to claim 2,
As a duty command value to be given to the boost converter, a control switching unit that selects the first duty command value at the time of the normal operation or rapid power generation request, and selects the second duty command value at the time of the rapid warm-up request. An output control device for a fuel cell.
In the fuel cell output control device according to any one of claims 2 to 5,
The boost converter includes a multi-phase boost circuit;
And a correction logic for equalizing a reactor current flowing through the booster circuit in each phase.
The fuel cell output control device according to claim 6,
The correction logic includes a first calculation unit that calculates an average value of the reactor current flowing through each phase;
A fuel cell output control device comprising: a second calculation unit that calculates a correction value for the duty command value according to a difference between a reactor current flowing through each phase and the average value.