JP2002008673A - Power generation system using fuel cell vehicle and control method thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an efficient power generation system using a fuel cell vehicle, which can achieve a reduction in power rate, and a control method thereof. An electric cord for collecting DC power 4 generated from a fuel cell vehicle group 3 and a collected DC power 4
It has a wiring 13 for supplying to the commercial power supply 9 or the load 12 via the control / monitoring center 5 having the interconnection inverter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power generation system using a fuel cell vehicle driven by electricity generated by a fuel cell and a control method thereof.

[0002]

2. Description of the Related Art For example, US Pat. No. 5,047,29.
No. 8 discloses a fuel cell that generates power by reacting hydrogen and oxygen.

[0003] Also, JP-A-51-4717 discloses that
There is disclosed a fuel cell vehicle that includes a fuel cell that generates power by reacting such hydrogen and oxygen, and that drives a driving motor with the electricity generated by the fuel cell to run.

[0004] In recent years, with the increase in global environmental problems, fuel cell vehicles have been actively developed with the aim of increasing the efficiency of power sources, reducing emissions, using alternative fuels, and reducing waste.

FIGS. 7A and 7B are views showing the structure of a fuel cell vehicle. (A) is a hydrogen supply type vehicle, (b)
Indicates a direct fuel supply type vehicle.

[0006] In (a), 71 is a fuel cell vehicle,
72 is a hydrogen supply means, 73 is hydrogen, 74 is a hydrogen storage alloy, 75 is a liquid hydrogen tank, 76 is a high-pressure hydrogen tank, 7
Reference numeral 7 denotes a fuel cell, 78 denotes DC power, 79 denotes a battery (storage battery), and 80 denotes a drive system motor.

In FIG. 2B, reference numeral 81 denotes a fuel direct supply means, 82 denotes fuel, 83 denotes a fuel tank, and 84 denotes a reformer. The components denoted by the same reference numerals as those in (a) indicate the same components.

As the oxygen source of the fuel cell 77, air is usually used. As a hydrogen source of the fuel cell, a method of mounting on a car as hydrogen (a hydrogen supply type car of (a)) and a reformer 84 for reforming a fuel having a high energy density such as methanol to generate hydrogen are mounted. There is a method ((b) direct fuel supply type automobile).

In the hydrogen supply type (a), the mainstream is to reform the fuel in an external reformer to supply hydrogen, and (b)
In the direct fuel supply type, the mainstream is to supply fuel using an existing gas station or the like.

As fuel, gasoline, LP gas, natural gas and the like are used in addition to methanol.

Both types of automobiles have a built-in battery 79, and the DC power generated by the fuel cell 77 can be directly supplied to the motor 80 or temporarily stored in the battery 79.

The most advanced fuel cell type currently used for automobiles is a polymer electrolyte fuel cell (PEF).
C), and the fuel cell generates power of 50 kW to 70 kW in a form in which a large number of flat single cells are stacked.

The fuel cell 77 is an energy converter that directly converts chemical energy into electric energy through a reactant supplied from the outside without moving parts, and is a principle such as a Carnot cycle in a heat engine. There is an advantage that there is no limit and extremely high energy conversion efficiency can be obtained quietly.

As described above, the fuel cell 77 continues to generate power as long as hydrogen or fuel and oxygen are supplied, and a fuel cell vehicle using the fuel cell as a power source is an electric vehicle that can run only by the amount of power stored in the secondary battery. Alternatively, it can continue to run on hydrogen or fuel and oxygen, at least until the fuel cell degrades. Because of these advantages, fuel cell vehicles are becoming "technology drivers" that are driving the spread of fuel cells.

Further, up to now, reverse power flow from a distributed power source (DC power source) such as a solar cell or a fuel cell to a commercial power source (commercial power system) has not been possible due to regulation, but surplus power of the distributed power source is not It has become possible to sell power to electric power companies. In addition, selling electric power means selling electric power to an electric power company, and purchasing electric power means purchasing electric power from an electric power company.

Actually, the amount of electric power used in each home or company fluctuates greatly depending on time and season.

FIG. 8A is a diagram showing the daily power consumption (daily load curve) in a general house (each house).
Month) and the interim period (May). (B) is a diagram showing the daily power consumption (daily load curve) in the NTT communication building,
Shows summer and winter.

For example, as shown in (a), in a general house, power consumption is concentrated during the evening to night hours, and in contrast, as shown in (b), NTT is an example of an office building. In a communication building, power consumption is concentrated during the day.

On the other hand, the fuel cell vehicle 71 shown in FIG.
Is always constant regardless of time.

FIG. 9 (a) is a table showing the charge of the electric energy,
(B) is a table showing surcharges of surplus power from distributed power sources, both of which are provided by TEPCO.

The power rate in each time zone fluctuates as shown in (a), and the power selling rate of surplus power from the distributed power source is also
As shown in (b), it varies depending on the time zone and the season.
The time zone of the midnight power in (a) is a time zone other than 8:00 to 22:00, for example.

[0022]

In the future, when fuel cell vehicles are widely used and their number of vehicles is increasing, the fuel cells of the fuel cell vehicles generate electricity during the time when the fuel cell vehicles are parked. If you do not need it, especially if you park for a long time, you will leave the above fuel cell,
Its effective use was required.

Further, even in a conventional system interconnection with a stationary distributed power source, no consideration is given to reverse power flow, and the purchase and sale of commercial power (hereinafter referred to as power purchase and power sale; the same applies hereinafter). ), And no control has been proposed at all in consideration of daily load fluctuations at each location.

Therefore, it is considered that an effective reduction of the electricity rate or a power generation business can be achieved by properly combining the variation in the amount of electricity used in the place where the fuel cell vehicle is parked with the variation in the power purchase price.

[0025] It is an object of the present invention to provide an efficient power generation system using a fuel cell vehicle, which can achieve a reduction in power rate, and to provide a control method therefor.

[0026]

Means for Solving the Problems To solve the above problems, the present inventors have developed a power generation system using a fuel cell vehicle and a control method thereof, especially a new power generation business when the fuel cell vehicle is not used. Suggest.

That is, in the power generation system using the fuel cell vehicle according to the present invention, the DC power generated from the fuel cell vehicle is collected by the power generation system, and the collected DC power is transmitted to the control / monitoring center having the interconnection inverter. Means for supplying at least one of a commercial power supply and a load.

Further, the fuel cell vehicle is a vehicle parked in a parking lot attached to an apartment house.

Further, the fuel cell vehicle is a vehicle parked in a parking lot attached to an office or a station.

Further, the fuel cell vehicle is a standby vehicle of a bus company or a taxi company.

Further, the fuel cell vehicle is a vehicle parked in a parking lot of a private house in a predetermined area.

In the future, when a fuel cell vehicle spreads and its use number increases, the fuel cell vehicle of the fuel cell vehicle does not need to generate electric power when it is parked. Will leave the fuel cell unattended. In the power generation system using the fuel cell vehicle of the present invention, during that time zone, the fuel cell vehicle is effectively used,
It is possible to reduce electricity rates or to create a new power generation business.

Further, according to the method of controlling a power generation system using a fuel cell vehicle of the present invention, the unit price of purchased power is set to B (t) (yen / k).
Wh), the unit price of electricity sold is S (t) (yen / kWh), t is the time of day, and the unit price of fuel cell generation is A (yen / kW).
h), the power unit price of the storage battery is L × A (yen / kWh), Bm
ax is the maximum value of B (t), Bmin is the minimum value of B (t), Smax is the maximum value of S (t), and Smin is S (t).
, The power consumption at the load is W (t) (kW), the maximum output power of the fuel cell is P (kW), the time when the power unit price is high is t1, and the time when the time period when the power unit price is high ends. Is set to t2, if Bmax <A, L × A (“,” represents “and”; the same applies hereinafter), all power is purchased, and if Smax <A <Bmax <L × A, P <W When t1 ≦ t ≦ t2 in (t), the fuel cell is fully operated and (P−W) is purchased. When P <W (t) and t1 ≦ t ≦ t2, the fuel cell is not operated. Turn off the power and W
All power, and t1 ≦ t ≦ t2 instead of P <W (t)
In the case of, the fuel cell is operated with the power generation amount suppressed to P = W,
If P <W (t) and not t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, all power for W is purchased, and Smax <A, L × A <Bmax and Bmin <A <Smax <L × A <Bmax, P <W (t), and t1 ≦ t ≦ t2, the fuel cell is fully operated, power is supplied from the storage battery, and the shortage is purchased, and P1 is t1 with P <W (t). If ≦ t ≦ t2, the power supply to the fuel cell is stopped, all the power for W is purchased, and if the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is turned off by P = Operate with reduced power generation up to W, P <
If the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of W (t), the fuel cell is fully operated and (P−
W) to the storage battery, and t1 ≦ t instead of P <W (t)
If ≦ t2, the power supply to the fuel cell is stopped, and all the power for W is purchased. If Bmin <A, L × A <Smax, if P <W (t) and t1 ≦ t ≦ t2, the fuel cell is turned off. When full operation is performed and power is supplied from the storage battery, the shortage is purchased. If P <W (t) and t1 ≦ t ≦ t2 is not satisfied, the power supply to the fuel cell is stopped, and W is completely purchased. If the storage battery is fully charged at t1 ≦ t ≦ t2 instead of <W (t), the fuel cell is fully operated and (P−W) is sold, and P <W (t) is not satisfied. When the storage battery is not fully charged at t1 ≦ t ≦ t2, the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
When 1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, and all the power for W is purchased. When Smin <A <Bmin <L × A <Smax, t1 ≦ t ≦ t2 with P <W (t) In this case, the fuel cell is fully operated, and the power is supplied from the storage battery, and the shortage is purchased, and if P <W (t) and t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped and If the power is purchased and the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated and (P−W) is sold, and P <W If the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of (t), the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
If 1 ≦ t ≦ t2, the fuel cell is operated with the amount of power generation suppressed to P = W. If Smin <A, L × A <Bmin, if P <W (t), the fuel cell is fully operated. When the power is supplied from the storage battery and the shortage is purchased, and the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated and (P -W), and if the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
If 1 ≦ t ≦ t2 and the storage battery is fully charged,
Operate the fuel cell with the amount of power generation suppressed to P = W, P <W
If not (t) but t1 ≦ t ≦ t2 and the storage battery is not fully charged, the fuel cell is fully operated and (P−
W) is supplied to the storage battery, and if A <Smin <L × A <Bmin and A, L × A <Smin, if P <W (t), the fuel cell is fully operated and power is supplied from the storage battery. If the storage battery is fully charged instead of P <W (t) instead of P <W (t), the fuel cell is fully operated and (P−W) power is sold, and P <W If the storage battery is not fully charged but not (t), the fuel cell is operated at full power and (PW) power is supplied to the storage battery.

According to the control method of the present invention, it is possible to provide a control method of an efficient power generation system using a fuel cell vehicle, which can achieve a reduction in power rate.

[0035]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, those having the same functions are denoted by the same reference numerals, and the repeated description thereof will be omitted.

Embodiment 1 FIG. 1 is a diagram showing a power generation system using a fuel cell vehicle according to Embodiment 1 of the present invention.

1 is a fuel supply port, 2 is hydrogen (H ₂ ) gas, 3 is a group of fuel cell vehicles, 4 is DC power, 5 is control
A monitoring center, 6 is an inverter connected to the control / monitoring center 5, 7 is a storage battery, 8 is an alternating current, 9 is a commercial power supply, 10 is a power sale, 11 is a power purchase, 12 is a load, 13 is a commercial power supply 9, and a load 12 This is the wiring supplied to.

In the first embodiment, a fuel cell private vehicle group 3 in an underground parking lot or a peripheral parking lot in an apartment house with a long parking time is used. Apartment houses are apartments, company houses, etc.
A large number of houses are gathered, and it is highly probable that many cars are parked for a long time in the dedicated parking lot.

As shown in FIG. 1, a fuel-reformed hydrogen gas 2 is supplied from a fuel supply port 1 provided in a parking lot to a fuel cell vehicle group 3 (the fuel cell vehicle is a direct fuel supply type (see FIG. 1). 7 (b)), the fuel may be supplied directly), and the fuel cells in each car (FIGS. 7 (a), (b)
77) is generated.

The generated DC power 4 is not supplied to the drive system motor (80 in FIGS. 7 (a) and 7 (b)) of the parked vehicle, but is taken out of the vehicle and the interconnection inverter 6 is turned on. Power is sold to the commercial power supply 9 via the control and monitoring center 5. Alternatively, power is supplied to the load 12 in the apartment house together with the commercial power supply 9.

Storage battery 7 for stably supplying power
May be separately installed immediately before the interconnection inverter 6 of the control / monitoring center 5, as shown in FIG. 1, or since such a separate installation is expensive, the battery (FIG. (A) and (b) 79) may be used.

It has long been considered that a DC power source such as a solar cell or a fuel cell is used as a distributed power source. The interconnection inverter 6 is used together with the commercial power source 9 to load the load 12. This is an inverter used to convert the output of the DC power source, that is, the DC power 4 to the AC 8 when supplying power. Connecting the distributed power supply to the commercial power supply 9 to supply power to the load 12 is called system interconnection. As the interconnection inverter 6, an inverter generally used when a DC power source such as a stationary solar cell or a fuel cell is used as a distributed power source is used. For example, insulated bipolar transistors (Insulated
Gate Bipolar Transistor. Some use a switching circuit including an IGBT, and others use a PWM inverter. PWM is an abbreviation of Pulse Width Modulation, a method of creating a large number of pulse trains in a half cycle of an output waveform, changing the equivalent voltage of the pulse width in a sine wave form, and obtaining a low-frequency high-frequency and smooth output. The PWM inverter is an inverter using that method. The main body of the interconnection inverter 6 has a CPU, in which an algorithm function of a power generation system control method described later is provided, or a CPU is provided outside the interconnection inverter 6.
Is installed as a control device.

In the first embodiment, the fuel cell vehicle group 3
An electric cord (not shown) having a connection terminal to a fuel cell, for example, which is a means for collecting (extracting) DC power 4 generated from an electric power cord between the fuel cell vehicle group 3 and the control / monitoring center 5 in FIG. ) Etc. and the collected DC power 4
And a wiring 13 which is means for supplying at least one of the commercial power supply 8 and the load 12 via the control / monitoring center 5 having the interconnection inverter 6. As a result, it is possible to effectively use the fuel cell vehicle group 3 to reduce a power rate and provide a new power generation business.

FIGS. 2 to 5 are diagrams for explaining the algorithm of the control method of the power generation system according to the first embodiment.

FIG. 2A is a diagram showing a temporal transition of each unit price of power from a power purchase, a power sale, a power generation, and a storage battery.

In the power purchase and sale, a person who performs a power generation business using a fuel cell vehicle buys power from a power company,
It means selling.

The unit price at the time of power purchase is B (t) (power purchase unit function) (yen / kWh), and the unit price at the time of power sale is S (t).
(Power selling unit price function) (yen / kWh). t is a parameter representing the time of day. For example, unit price B
(T) and the unit price S (t) from the tables of FIGS. 9A and 9B are like step functions whose values fluctuate at a certain time.

The power generation unit price of the fuel cell is A (yen / kWh),
Let the unit price of the power of the storage battery be L × A (yen / kWh). The unit price of power generation A of a fuel cell is expected to become lower as the development and spread of fuel cells progress, but at present, 12.8 yen / k for a 1 kW class polymer electrolyte fuel cell (PEFC).
It is about W. When using the power once stored in the storage battery, the unit price of the power is
It is estimated to be L times the power generation unit price of the fuel cell, and the unit price of the electric power from the storage battery is expressed as L × A. Usually L is 1.1 to 1.2
(A <L × A).

In FIG. 2A, Bmax is B (t)
, Bmin is the minimum value of B (t), and Smax is S
The maximum value of (t), Smin, indicates the minimum value of S (t).
Here, as can be seen from the tables of FIGS. 9A and 9B,
At any time, the unit price of power sale <the unit price of power purchase. In addition, Bmin <Smax was set based on the current TEPCO electricity rate and electricity purchase rate, but Bmin> S
Even if it is max, the following flowchart can be derived from the same concept.

FIG. 2B is a diagram showing an example of a load function and a temporal transition of the output of the fuel cell.

The power consumption at the load is W (t) (kW), and the maximum output power of the fuel cell is P (kW). Since the amount of power generation per fuel cell vehicle is 50 to 70 kW,
If there is no parking lot, several hundred kW of power can be generated.
Is about several hundred kW. For example, W (t) of a house or an NTT communication building is as shown in FIG.

FIGS. 3 to 5 are flowcharts of specific examples of the control method of the power generation system according to the first embodiment.

Here, the unit price of power generation A of the fuel cell, the unit price of power L × A from the storage battery, and the maximum values Bmax, B of B (t)
The minimum value Bmin of (t) and the maximum value Smax of S (t)
Is given by the following 9 according to the relationship with the minimum value Smin of S (t).
The cases were classified as follows, and the most efficient way to use power was shown for each case.

Bmax <A, L × A (“,” represents “and”; the same applies hereinafter) Smax <A <Bmax <L × A Smax <A, L × A <Bmax Bmin <A <Smax <L × A <Bmax Bmin <A, L × A <Smax Smin <A <Bmin <L × A <Smax Smin <A, L × A <Bmin A <Smin <L × A <Bmin A, L × A <Smin or less, The control method of the power generation system according to the first embodiment will be described with reference to FIGS. In addition, FIG.
FC in FIG. 5 is a fuel cell, t1 ≦ t ≦ t
2 is a time zone in which the power unit price defined in FIG. 2A is high, that is, t1 is a time when the power unit price is high, t2.
Indicates the time at which the time period in which the unit price of electric power becomes high ends. As can be seen from the tables of FIGS. 9A and 9B, for example, t
1 is 8:00 and t2 is 22:00.

That is, if Bmax <A, L × A, all power is purchased, if Smax <A <Bmax <L × A, if P <W (t) and t1 ≦ t ≦ t2, the fuel cell is Full operation (operating at the maximum output of the fuel cell) and (P-
W), and if P <W (t) and t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, and all W components are purchased.
If t1 ≦ t ≦ t2 instead of <W (t), the fuel cell is switched to P
= W, the operation is performed with the power generation suppressed, and P <W (t) instead of t
When 1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, all the power for W is purchased, and if Smax <A, L × A <Bmax and Bmin <A <Smax <L × A <Bmax, P <W When t1 ≦ t ≦ t2 in (t), the fuel cell is fully operated, power is supplied from the storage battery, and the shortage is purchased, and if t1 ≦ t ≦ t2 in P <W (t), the fuel When the power supply of the battery is stopped, the power for W is purchased, and when the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is operated with the power generation suppressed to P = W. Then P <
If the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of W (t), the fuel cell is fully operated and (P−
W) to the storage battery, and t1 ≦ t instead of P <W (t)
If ≦ t2, the power supply to the fuel cell is stopped, and all the power for W is purchased. If Bmin <A, L × A <Smax, if P <W (t) and t1 ≦ t ≦ t2, the fuel cell is turned off. When full operation is performed and power is supplied from the storage battery, the shortage is purchased. If P <W (t) and t1 ≦ t ≦ t2 is not satisfied, the power supply to the fuel cell is stopped, and W is completely purchased. If the storage battery is fully charged at t1 ≦ t ≦ t2 instead of <W (t), the fuel cell is fully operated and (P−W) is sold, and P <W (t) is not satisfied. When the storage battery is not fully charged at t1 ≦ t ≦ t2, the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
When 1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, and all the power for W is purchased. When Smin <A <Bmin <L × A <Smax, t1 ≦ t ≦ t2 with P <W (t) In this case, the fuel cell is fully operated, and the power is supplied from the storage battery, and the shortage is purchased, and if P <W (t) and t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped and If the power is purchased and the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated and (P−W) is sold, and P <W If the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of (t), the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
If 1 ≦ t ≦ t2, the fuel cell is operated with the amount of power generation suppressed to P = W. If Smin <A, L × A <Bmin, if P <W (t), the fuel cell is fully operated. When the power is supplied from the storage battery and the shortage is purchased, and the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated and (P -W), and if the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
If 1 ≦ t ≦ t2 and the storage battery is fully charged,
Operate the fuel cell with the amount of power generation suppressed to P = W, P <W
If not (t) but t1 ≦ t ≦ t2 and the storage battery is not fully charged, the fuel cell is fully operated and (P−
W) is supplied to the storage battery, and if A <Smin <L × A <Bmin and A, L × A <Smin, if P <W (t), the fuel cell is fully operated and power is supplied from the storage battery. If the storage battery is fully charged instead of P <W (t) instead of P <W (t), the fuel cell is fully operated and (P−W) power is sold, and P <W If not (t) but the storage battery is not fully charged, the fuel cell is fully operated and (PW) power is supplied to the storage battery.

As can be seen from the above, it is possible to sell electric power in the case of, but even in the case of, economical use of electric power is possible.

According to the above-described control method, it is possible to provide an efficient control method of a power generation system using a fuel cell vehicle, which can achieve a reduction in a power rate.

In the first embodiment, a multi-family housing is taken as an example. However, in a parking lot of a business establishment, a group of private cars used for commuting is used to generate power during working hours and perform similar charging. Alternatively, in a parking lot near the station, a power generation business using private cars used for commuting to the station can be performed.
In addition, a power generation business using a group of standby cars such as a bus company and a group of standby taxis during a daytime period when a taxi company has few passengers can be considered.

Embodiment 2 FIG. 6 is a diagram showing a power generation system using a fuel cell vehicle according to Embodiment 2 of the present invention.

Reference numeral 61 denotes a private house, 62 denotes a hot water tank, 63 denotes DC power, 64 denotes exhaust heat, 65 denotes a fuel cell vehicle, 66 denotes DC power, 67 denotes a control / monitoring center, 68 denotes an interconnected inverter, and 69 denotes AC. (Power sale), 70 is a commercial power supply.

In the first embodiment, the case where a large number of automobiles are gathered and parked for a long time has been described. However, even in a case where cars are dispersed, such as in a private house, a fuel cell automobile can be used for a power generation business. The second embodiment is such a power generation system.

In the power supply business, the houses in the area are collectively sold to a commercial power supply 70 via a control / monitoring center 67 having an interconnection inverter 68. In each house 61, cogeneration is performed, and DC power 63 generated by the fuel cell vehicle 65 is converted into AC and used at home load, and
Hot water can be supplied to the hot water storage tank 62 using the exhaust heat 64 of the fuel cell. Also in this case, the power control method performed by the interconnection inverter 68 or an external control device is the same as in the first embodiment.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the spirit of the present invention. It is.

[0064]

As described above, according to the present invention,
By effectively utilizing a fuel cell vehicle, it is possible to reduce a power rate and provide a new power generation system and a control method thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing a power generation system using a fuel cell vehicle according to a first embodiment of the present invention.

FIG. 2A is a diagram illustrating a temporal transition of each unit price of power from a power purchase, a power sale, a power generation, and a storage battery, and FIG. 2B is an example of a temporal transition of a load function and an output of a fuel cell; FIG.

FIGS. 3A and 3B are flowcharts of a specific example of a control method of the power generation system according to the first embodiment.

FIGS. 4C and 4D are flowcharts of a specific example of the control method of the power generation system according to the first embodiment.

FIGS. 5E and 5F are flowcharts of a specific example of the power generation system control method according to the first embodiment.

FIG. 6 is a diagram showing a power generation system using a fuel cell vehicle according to Embodiment 2 of the present invention.

FIG. 7A is a hydrogen supply type fuel cell vehicle, and FIG.
FIG. 1 is a diagram showing a configuration of a fuel cell vehicle of a direct fuel supply type.

FIG. 8A is a diagram showing a daily power consumption (daily load curve) in a general house (each household), and FIG. 8B is a diagram showing a daily power consumption (daily load curve) in an NTT communication building. FIG.

FIG. 9A is a table showing a charge of the amount of power, and FIG. 9B is a table showing a charge of selling surplus power from the distributed power source.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel supply port, 2 ... Hydrogen gas, 3 ... Fuel cell vehicle group, 4 ... DC power, 5 ... Control / monitoring center, 6 ... Interconnected inverter, 7 ... Storage battery, 8 ... AC, 9 ... Commercial power supply, 1
0 ... power sale, 11 ... power purchase, 12 ... load, 13 ... wiring, 61
... Private house, 62 ... Hot storage tank, 63 ... DC power, 65 ... Fuel cell vehicle, 66 ... DC power, 67 ... Control and monitoring center, 68 ... Linked inverter, 69 ... AC, 70 ... Commercial power supply, 71 ... Fuel Battery car, 72 ... hydrogen supply means, 73
... hydrogen, 74 ... hydrogen storage alloy, 75 ... liquid hydrogen tank,
76 high-pressure hydrogen tank, 77 fuel cell, 78 DC power, 79 battery, 80 drive system motor, 81 direct fuel supply means, 82 fuel, 83 fuel tank, 84
Reformer.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02M 7/48 H02M 7/48 R (72) Inventor Tetsuo Take 2-3-1 Otemachi, Chiyoda-ku, Tokyo No. Nippon Telegraph and Telephone Corporation (72) Inventor Satoshi Otsu 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term within Nippon Telegraph and Telephone Corporation (reference) 3D035 AA00 5G066 HA15 HB07 5H007 BB06 BB07 EA02 5H115 PC06 PG04 PI16 PI18 PO01 PU01 QE01 QE02 QE03 QE12 SE01 TI01

Claims (6)

[Claims] 1. Means for collecting DC power generated from a fuel cell vehicle, and means for supplying the collected DC power to at least one of a commercial power supply and a load via a control / monitoring center having an interconnection inverter. A power generation system using a fuel cell vehicle. 2. The power generation system using a fuel cell vehicle according to claim 1, wherein said fuel cell vehicle is a vehicle parked in a parking lot attached to an apartment house. 3. The power generation system using a fuel cell vehicle according to claim 1, wherein the fuel cell vehicle is a vehicle parked in a parking lot attached to an office or a station. 4. The power generation system using a fuel cell vehicle according to claim 1, wherein the fuel cell vehicle is a standby vehicle of a bus company or a taxi company. 5. A power generation system using a fuel cell vehicle according to claim 1, wherein said fuel cell vehicle is a vehicle parked in a parking lot of a private house in a predetermined area. 6. The unit price of power purchase is B (t) (yen / kWh), the unit price of power sale is S (t) (yen / kWh), t is the time of day, and the unit price of fuel cell generation is A ( Yen / kWh), the power unit price of the storage battery is L × A (yen / kWh), and Bmax is B (t).
Is the maximum value, Bmin is the minimum value of B (t), and Smax is S
The maximum value of (t), the minimum value of Smin, the minimum value of S (t), the power consumption at the load is W (t) (kW), the maximum output power of the fuel cell is P (kW), and the time at which the power unit price becomes high is Assuming that t1 is the time at which the time period in which the unit price of electricity increases becomes t2, when Bmax <A, L × A (“,” represents “and”; the same applies hereinafter), all power is purchased, and Smax < When A <Bmax <L × A, when P <W (t) and t1 ≦ t ≦ t2, the fuel cell is fully operated and (P−W) is purchased, and P <W (t ), If t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped and
All power, and t1 ≦ t ≦ t2 instead of P <W (t)
In the case of, the fuel cell is operated with the power generation amount suppressed to P = W,
If P <W (t) and not t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, all power for W is purchased, and Smax <A, L × A <Bmax and Bmin <A <Smax <L × A <Bmax, P <W (t), and t1 ≦ t ≦ t2, the fuel cell is fully operated, power is supplied from the storage battery, and the shortage is purchased, and P1 is t1 with P <W (t). If ≦ t ≦ t2, the power supply to the fuel cell is stopped, all the power for W is purchased, and if the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is turned off by P = Operate with reduced power generation up to W, P <
If the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of W (t), the fuel cell is fully operated and (P−
W) to the storage battery, and t1 ≦ t instead of P <W (t)
If ≦ t2, the power supply to the fuel cell is stopped, and all the power for W is purchased. If Bmin <A, L × A <Smax, if P <W (t) and t1 ≦ t ≦ t2, the fuel cell is turned off. When full operation is performed and power is supplied from the storage battery, the shortage is purchased. If P <W (t) and t1 ≦ t ≦ t2 is not satisfied, the power supply to the fuel cell is stopped, and W is completely purchased. If the storage battery is fully charged at t1 ≦ t ≦ t2 instead of <W (t), the fuel cell is fully operated and (P−W) is sold, and P <W (t) is not satisfied. When the storage battery is not fully charged at t1 ≦ t ≦ t2, the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
When 1 ≦ t ≦ t2, the power supply to the fuel cell is stopped, and all the power for W is purchased. When Smin <A <Bmin <L × A <Smax, t1 ≦ t ≦ t2 with P <W (t) In this case, the fuel cell is fully operated, and the power is supplied from the storage battery, and the shortage is purchased, and if P <W (t) and t1 ≦ t ≦ t2, the power supply to the fuel cell is stopped and If the power is purchased and the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated and (P−W) is sold, and P <W If the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of (t), the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
If 1 ≦ t ≦ t2, the fuel cell is operated with the amount of power generation suppressed to P = W. If Smin <A, L × A <Bmin, if P <W (t), the fuel cell is fully operated. When the power is supplied from the storage battery and the shortage is purchased, and the storage battery is fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated and (P -W), and if the storage battery is not fully charged at t1 ≦ t ≦ t2 instead of P <W (t), the fuel cell is fully operated, and
(P−W) is supplied to the storage battery, and P <W (t) instead of t <W (t)
If 1 ≦ t ≦ t2 and the storage battery is fully charged,
Operate the fuel cell with the amount of power generation suppressed to P = W, P <W
If not (t) but t1 ≦ t ≦ t2 and the storage battery is not fully charged, the fuel cell is fully operated and (P−
W) is supplied to the storage battery, and if A <Smin <L × A <Bmin and A, L × A <Smin, if P <W (t), the fuel cell is fully operated and power is supplied from the storage battery. If the storage battery is fully charged instead of P <W (t) instead of P <W (t), the fuel cell is fully operated and (P−W) power is sold, and P <W 5. The battery according to claim 1, wherein the fuel cell is operated at full capacity and the (PW) portion is supplied to the storage battery when the storage battery is not fully charged, not in (t). Of controlling a power generation system using a fuel cell vehicle.