JP4981317B2 - Fuel cell power supply system - Google Patents

Fuel cell power supply system Download PDF

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JP4981317B2
JP4981317B2 JP2005364238A JP2005364238A JP4981317B2 JP 4981317 B2 JP4981317 B2 JP 4981317B2 JP 2005364238 A JP2005364238 A JP 2005364238A JP 2005364238 A JP2005364238 A JP 2005364238A JP 4981317 B2 JP4981317 B2 JP 4981317B2
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fuel cell
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fuel cells
boost chopper
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JP2007172841A (en
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功次 小西
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河村電器産業株式会社
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Description

本発明は、複数の燃料電池が出力した直流電力を交流電力に変換して電力消費ユニットに供給する給電システム、特に、小規模集合住宅に適した燃料電池給電システムに関するものである。 The present invention relates to a power supply system that converts DC power output from a plurality of fuel cells into AC power and supplies it to a power consuming unit, and more particularly to a fuel cell power supply system suitable for a small-scale apartment house.

従来、燃料電池が出力した直流電力をパワーコンディショナーで交流電力に変換し、商用系統（商用交流電源）と連系して、小規模集合住宅の複数の住戸に供給する給電システムが提案されている（例えば、特許文献１）。
特開２００４−３２７１６０号公報 Conventionally, a power supply system has been proposed in which DC power output from a fuel cell is converted into AC power by a power conditioner and connected to a commercial system (commercial AC power supply) and supplied to a plurality of dwelling units in a small apartment house. (For example, patent document 1).
JP 2004-327160 A

図３は従来の燃料電池給電システムの一例を示す。このシステムは、５戸の住戸７１〜７５で構成された小規模集合住宅７０を対象とし、５Ｋｗの一台の燃料電池５１と貯湯タンク等の排熱回収用の給湯設備（図示せず）とを備え、燃料電池５１の出力する直流電力をパワーコンディショナー５２で交流電力に変換し、電力線網に連系して各住戸７１〜７５へ電力を供給している。このシステムでは集合住宅７０側での使用電力が低い軽負荷運転のとき、燃料電池５１の発電効率や補機類の排熱回収効率が低下し、総合的なエネルギー効率が低下するという問題点が有った。 FIG. 3 shows an example of a conventional fuel cell power supply system. This system is intended for a small apartment 70 composed of five units 71 to 75, a single 5Kw fuel cell 51 and a hot water supply facility (not shown) for recovering exhaust heat such as a hot water storage tank. The DC power output from the fuel cell 51 is converted into AC power by the power conditioner 52, and the power is supplied to each of the dwelling units 71 to 75 through the power line network. This system has a problem that the power generation efficiency of the fuel cell 51 and the exhaust heat recovery efficiency of the auxiliary machinery are reduced during the light load operation with low power consumption on the apartment house 70 side, and the overall energy efficiency is reduced. There was.

図４は従来の改良システムを示す。このシステムは、燃料電池部６１に１ｋＷの独立運転可能な５台の燃料電池６１〜６５を備え、集合住宅７０での使用電力が少ないときは、５台のうち必要に応じた台数の燃料電池で直流電力を発電することで、軽負荷運転時の効率低下を抑えている。そして、図３のシステムと同様、燃料電池６１〜６５で発電した直流電力をパワーコンディショナー５２で交流電力に変換し、電力線網を経て各住戸７１〜７５に電力を供給する。 FIG. 4 shows a conventional improved system. This system is provided with five fuel cells 61 to 65 capable of independent operation of 1 kW in the fuel cell unit 61. When the power consumption in the apartment house 70 is small, as many fuel cells as necessary out of the five units are used. By generating direct-current power with the, the efficiency drop during light load operation is suppressed. 3, DC power generated by the fuel cells 61 to 65 is converted into AC power by the power conditioner 52, and power is supplied to each of the units 71 to 75 via the power line network.

図５は従来の給電システムで用いられるパワーコンディショナー５２の回路構成を示す。このパワーコンディショナー５２は、昇圧チョッパ部８３とインバータ部８４と連系部８５とを備え、燃料電池５１の出力するＤＣ４８Ｖ程度の低い電圧を昇圧チョッパ部８３でＤＣ３５０〜４００Ｖ程度まで昇圧し、インバータ部８４で交流電力に変換した後に、連系部８５を経て商用系統６０や電力線網に給電するように構成されている。 FIG. 5 shows a circuit configuration of a power conditioner 52 used in a conventional power feeding system. The power conditioner 52 includes a step-up chopper 83, an inverter 84, and a connection portion 85. The power conditioner 52 boosts a low voltage of about 48V DC output from the fuel cell 51 to about 350 to 400V DC by the step-up chopper 83, and the inverter unit. After being converted into AC power at 84, power is supplied to the commercial system 60 and the power line network via the interconnection unit 85.

しかし、従来の給電システムによると、燃料電池の発電電力が５ｋＷで出力電圧が４８Ｖの場合、パワーコンディショナー５２の入力端子、昇圧チョッパ部８３のリアクトルＬ、スイッチング素子ＳＷおよびその配線には１００Ａ以上の電流が流れる。この電流による損失は次式より求められる。
（電流）２ ×（抵抗）
抵抗：リアクトルＬと配線の直流抵抗及びスイッチング素子ＳＷのオン抵抗を含む
従って、昇圧チョッパ部８３の入力電流が大きくなるほど、パワーコンディショナー５２の損失が電流の２乗に比例して大きくなり、給電システム全体のエネルギー効率が低下する問題点が有った。 However, according to the conventional power supply system, when the generated power of the fuel cell is 5 kW and the output voltage is 48 V, the input terminal of the power conditioner 52, the reactor L of the boost chopper 83, the switching element SW, and the wiring thereof are 100A or more. Current flows. The loss due to this current is obtained from the following equation.
(Current) 2 x (resistance)
Resistance: including the DC resistance of the reactor L and the wiring and the ON resistance of the switching element SW. Therefore, as the input current of the boost chopper 83 increases, the loss of the power conditioner 52 increases in proportion to the square of the current. There was a problem that the overall energy efficiency was lowered.

そこで、本発明の目的は、パワーコンディショナーの損失を抑えて、総合エネルギー効率を高めることができる燃料電池給電システムを提供することにある。 Accordingly, an object of the present invention is to provide a fuel cell power supply system that can suppress the loss of a power conditioner and increase the total energy efficiency.

上記課題を解決するために、請求項１に係る発明は、複数の燃料電池が出力した直流電力をパワーコンディショナーで交流電力に変換して複数の電力消費ユニットに供給する燃料電池給電システムにおいて、パワーコンディショナーが各燃料電池に個別に接続された複数の昇圧チョッパ部と、各昇圧チョッパ部が直列に接続された一つのインバータ部とを備えたことを特徴とする。 In order to solve the above-described problem, the invention according to claim 1 is directed to a fuel cell power supply system that converts DC power output from a plurality of fuel cells into AC power by a power conditioner and supplies the AC power to a plurality of power consuming units. The conditioner includes a plurality of boost chopper units individually connected to each fuel cell, and one inverter unit in which each boost chopper unit is connected in series.

また、本発明の燃料電池給電システムは、各燃料電池の出力電圧を別々に検出する電圧検出部と、パワーコンディショナーを制御する制御部とを備え、制御部が電圧検出部の検出値に基づいて燃料電池の運転台数を判別し、運転中の燃料電池に接続された昇圧チョッパ部に燃料電池の運転台数に応じた出力電圧目標値を設定することを特徴とする。 Further, the fuel cell power supply system of the present invention includes a voltage detection unit that separately detects the output voltage of each fuel cell and a control unit that controls the power conditioner, and the control unit is based on the detection value of the voltage detection unit. The number of operating fuel cells is discriminated, and an output voltage target value corresponding to the number of operating fuel cells is set in the boost chopper connected to the operating fuel cell .

請求項１の発明によれば、複数の燃料電池を備えた給電システムにおいて、パワーコンディショナーに燃料電池と同数の昇圧チョッパ部を設けたので、個々の昇圧チョッパ部の入力電流を小さくし、パワーコンディショナーの損失を抑えて、総合エネルギー効率を高めることができる効果がある。また、パワーコンディショナーの出力電力が大きくなるほど、昇圧チョッパ部一台あたりの昇圧比が小さくなるため、昇圧運転の制御が容易となり、パワーコンディショナーの動作が安定する利点もある。さらに、燃料電池の保守・点検時に、対象となる燃料電池に接続された昇圧チョッパ部のみを停止させることができ、システムダウン（全発電停止）させることなく、メンテナンスを実施できる効果もある。 According to the first aspect of the present invention, in the power supply system including a plurality of fuel cells, since the power conditioner is provided with the same number of boost chopper units as the fuel cells, the input current of each boost chopper unit is reduced, and the power conditioner There is an effect that the total energy efficiency can be improved by suppressing the loss of the energy. In addition, as the output power of the power conditioner increases, the boost ratio per boost chopper section decreases, so that the boost operation can be easily controlled and the operation of the power conditioner is stable. Further, at the time of maintenance / inspection of the fuel cell, only the boost chopper connected to the target fuel cell can be stopped, and there is an effect that the maintenance can be performed without causing the system to go down (stopping all power generation).

また、本発明の燃料電池給電システムによれば、制御部が運転中の燃料電池に接続された昇圧チョッパ部に燃料電池の運転台数に応じた出力電圧目標値を設定するので、給電システムを電力需要の変動に合わせて経済的に稼動できる効果がある。 Further , according to the fuel cell power supply system of the present invention , the control unit sets the output voltage target value corresponding to the number of operating fuel cells in the boost chopper connected to the operating fuel cell. It has the effect of being able to operate economically according to fluctuations in demand.

以下、本発明の実施の形態について図面を参照して説明する。図１は小規模集合住宅用の燃料電池給電システムを示す。この給電システムは、５台の燃料電池１１〜１５からなる燃料電池部１と、各燃料電池１１〜１５が出力した直流電力を交流電力に変換するパワーコンディショナー２と、燃料電池部１及びパワーコンディショナー２を制御するマイクロコンピュータを用いた制御部３とを備え、パワーコンディショナー２の出力を商用系統６と連系して電力消費ユニットである複数の住戸７１〜７５（図３参照）に供給するように構成されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a fuel cell power supply system for a small apartment house. This power supply system includes a fuel cell unit 1 including five fuel cells 11 to 15, a power conditioner 2 that converts DC power output from each fuel cell 11 to 15 into AC power, a fuel cell unit 1, and a power conditioner. And a control unit 3 using a microcomputer for controlling 2 and supplying the output of the power conditioner 2 to a plurality of dwelling units 71 to 75 (see FIG. 3) which are connected to the commercial system 6 and are power consumption units. It is configured.

燃料電池１１〜１５には１Ｋｗの普及型電池が用いられ、５台の燃料電池１１〜１５が給湯設備等の排熱回収用の補機類を共有している。このため、最大発電容量５Ｋｗの燃料電池部１を安価に設備できるとともに、集合住宅７０側の電力需要が低下する軽負荷運転時に、５台の燃料電池１１〜１５のうち一部の電池のみを独立運転することで、燃料電池部１の総合発電効率を高めることが可能となる。 1 Kw popular type batteries are used for the fuel cells 11 to 15, and the five fuel cells 11 to 15 share auxiliary equipment for exhaust heat recovery such as hot water supply facilities. For this reason, while being able to install the fuel cell unit 1 having the maximum power generation capacity of 5 Kw at a low cost, only a part of the five fuel cells 11 to 15 can be installed at the time of light load operation in which the power demand on the apartment house 70 side is reduced. By performing the independent operation, the total power generation efficiency of the fuel cell unit 1 can be increased.

パワーコンディショナー２は、燃料電池１１〜１５と同数である５台の昇圧チョッパ部３１〜３５と、各昇圧チョッパ部３１〜３５が出力した直流電力を交流電力に変換する一台のインバータ部４と、インバータ部４の出力を商用系統６と連系させる連系部５とから構成されている。一つの昇圧チョッパ部の容量は燃料電池の発電容量に合わせて１ｋｗ程度に設定され、各昇圧チョッパ部３１〜３５の入力端子が５台の燃料電池１１〜１５にそれぞれ別々に接続されている。また、各昇圧チョッパ部３１〜３５の出力端子はダイオードＤ１〜Ｄ５を介してインバータ部４の入力端子に直列に接続されている。 The power conditioner 2 includes five boost chopper units 31 to 35 that are the same number as the fuel cells 11 to 15, and one inverter unit 4 that converts DC power output from the boost chopper units 31 to 35 into AC power. The interconnecting unit 5 interconnects the output of the inverter unit 4 with the commercial system 6. The capacity of one boost chopper is set to about 1 kw according to the power generation capacity of the fuel cell, and the input terminals of the boost choppers 31 to 35 are separately connected to the five fuel cells 11 to 15, respectively. The output terminals of the boost chopper units 31 to 35 are connected in series to the input terminal of the inverter unit 4 via the diodes D1 to D5.

ここで、燃料電池１１〜１５の一台あたりの出力電圧がＤＣ４８Ｖの場合、各昇圧チョッパ３１〜３５がそれぞれＤＣ８０Ｖを出力することで、インバータ部４に計４００Ｖの直流電圧を供給できる。インバータ部４が単相３線路のＡＣ２００Ｖ回路と連系するためには、ピーク値で２８０Ｖ強〜３００Ｖ程度の交流電圧を出力する必要がある。このため、昇圧チョッパ３１〜３５がインバータ部４にＤＣ４００Ｖを供給すれば、インバータ部４はそれ自身の半導体スイッチやリアクトルでの電圧降下を考慮してもＡＣ２００Ｖ回路に余裕を持って連系することができる。 Here, when the output voltage per unit of the fuel cells 11 to 15 is DC 48V, each boost chopper 31 to 35 outputs DC 80V, so that a DC voltage of 400V in total can be supplied to the inverter unit 4. In order for the inverter unit 4 to be linked to a single-phase three-line AC 200V circuit, it is necessary to output an AC voltage having a peak value of slightly higher than 280V to about 300V. For this reason, if the step-up choppers 31 to 35 supply DC 400V to the inverter unit 4, the inverter unit 4 should be connected to the AC 200V circuit with a margin even if the voltage drop in its own semiconductor switch or reactor is taken into consideration. Can do.

また、昇圧チョッパ部３１〜３５を燃料電池１１〜１５と同数設けたことにより、一台のチョッパ部の入力電流値を小さく抑えて、電流による損失値を低下させることも可能である。昇圧チョッパ部の損失値を従来のパワーコンディショナー５２（図５参照）とこの実施形態のパワーコンディショナー２とで比較すると、次のようになる。次式では、一つの昇圧チョッパ部のリアクトルＬと配線の直流抵抗及びスイッチング素子ＳＷのオン抵抗の合計がＲ（Ω）であると仮定する。 Further, by providing the same number of boosting chopper units 31 to 35 as the fuel cells 11 to 15, it is possible to suppress the input current value of one chopper unit to be small and to reduce the loss value due to the current. The loss value of the boost chopper is compared between the conventional power conditioner 52 (see FIG. 5) and the power conditioner 2 of this embodiment as follows. In the following equation, it is assumed that the sum of the reactor L of one step-up chopper unit, the DC resistance of the wiring, and the on-resistance of the switching element SW is R (Ω).

従来のパワーコンディショナー（１台の昇圧チョッパ部）の場合
入力電流 ５Ｋｗ÷４８（Ｖ）≒１０４．２（Ａ）
損失 （１０４．２）２×Ｒ≒１０８５７．６・Ｒ（Ｗ）
この実施形態のパワーコンディショナー（５台の昇圧チョッパ部）の場合
入力電流 １Ｋｗ÷４８（Ｖ）≒２０．８（Ａ）
損失 （２０．８）２×Ｒ×５≒２１６３．２Ｒ（Ｗ）
従って、この実施形態のパワーコンディショナー２によれば、昇圧チョッパ部３１〜３５の一台あたりの損失を従来のおよそ１／５程度まで低下させることができる。 In the case of a conventional power conditioner (one step-up chopper), the input current is 5 Kw ÷ 48 (V) ≈104.2 (A)
Loss (104.2) 2 × R≈10857.6 · R (W)
In the case of the power conditioner (five step-up chopper units) of this embodiment, the input current is 1 Kw ÷ 48 (V) ≈20.8 (A)
Loss (20.8) 2 × R × 5≈2163.2R (W)
Therefore, according to the power conditioner 2 of this embodiment, the loss per one step-up chopper part 31-35 can be reduced to about 1/5 of the conventional one.

一方、この実施形態の燃料電池給電システムは、各昇圧チョッパ部３１〜３５の入力電圧（燃料電池１１〜１５の出力電圧）を別々に検出する電圧検出器４１〜４５を燃料電池１１〜１５と昇圧チョッパ部３１〜３５との間の回路上に備えている。そして、図２のフローチャートに示すように、制御部３が電圧検出器４１〜４５の検出値に基づいて運転中の燃料電池１１〜１５の台数を判別し、運転中の燃料電池１１〜１５に接続された昇圧チョッパ部３１〜３５に運転台数に応じた出力電圧の目標値を設定するように構成されている。 On the other hand, in the fuel cell power feeding system of this embodiment, the voltage detectors 41 to 45 that individually detect the input voltages (output voltages of the fuel cells 11 to 15) of the boost chopper units 31 to 35 are connected to the fuel cells 11 to 15, respectively. It is provided on the circuit between the step-up chopper units 31-35. Then, as shown in the flowchart of FIG. 2, the control unit 3 determines the number of operating fuel cells 11 to 15 based on the detection values of the voltage detectors 41 to 45, and determines the number of operating fuel cells 11 to 15. The booster chopper units 31 to 35 connected to each other are configured to set a target value of an output voltage corresponding to the number of operating units.

図２において、まず、制御部３は電圧検出器４１〜４５の出力に基づいて昇圧チョッパ部３１〜３５の入力電圧を予め定めた閾値と比較してチェックする（Ｓ１）。閾値には例えば燃料電池１１〜１５の定格出力であるＤＣ４８Ｖを使用でき、燃料電池が運転していると電圧検出値はＤＣ４８Ｖ以上となり、停止していると０Ｖとなる。このため、ＤＣ４８Ｖ以上の電圧を出力する燃料電池を運転中と判別し、これに接続された昇圧チョッパ部ｎの運転を登録し（Ｓ２）、ＤＣ４８Ｖ未満の電圧を出力する燃料電池に接続された昇圧チョッパ部３１〜３５は運転を停止する（Ｓ３）。 In FIG. 2, first, the control unit 3 checks the input voltage of the boost chopper units 31 to 35 based on the outputs of the voltage detectors 41 to 45 by comparing with a predetermined threshold (S1). For example, DC48V, which is the rated output of the fuel cells 11 to 15, can be used as the threshold value. When the fuel cell is operating, the detected voltage value is DC48V or more, and when the fuel cell is stopped, it is 0V. For this reason, it is determined that the fuel cell that outputs a voltage of DC48V or higher is in operation, the operation of the boost chopper unit n connected thereto is registered (S2), and the fuel cell that outputs a voltage of less than DC48V is connected. The step-up chopper units 31 to 35 stop operating (S3).

全部の昇圧チョッパ部３１〜３５の電圧チェックを完了すると（Ｓ４：Ｙｅｓ）、次に、制御部３は運転登録された昇圧チョッパ部に登録台数に応じた出力電圧目標値を設定したのち、そのチョッパ部の昇圧運転を制御する（Ｓ５〜Ｓ１４）。例えば、すべての燃料電池１１〜１５が運転し、５台の昇圧チョッパ部３１〜３５が運転登録されている場合に（Ｓ５）、各昇圧チョッパ部３１〜３５の出力電圧目標値をそれぞれＤＣ８０Ｖに設定する（Ｓ６）。また、図１に示す一つの燃料電池１３が運転し、これに接続された昇圧チョッパ部３３のみが運転登録されている場合は（Ｓ１３）、その出力電圧目標値をＤＣ４００Ｖに設定し（Ｓ１４）、残り４台の昇圧チョッパ部３１，３２，３４，３５を停止した状態で、一台の昇圧チョッパ部３３の昇圧運転を制御する。この結果、インバータ部４は昇圧チョッパ部３３の出力コンデンサＣに蓄えられたＤＣ４００Ｖを＋側はダイオードＤ２，Ｄ１を経て、−側はダイオードＤ５，Ｄ４を経て入力することができる。 When the voltage check of all the boost chopper units 31 to 35 is completed (S4: Yes), the control unit 3 then sets the output voltage target value corresponding to the registered number in the boost chopper unit registered for operation. The step-up operation of the chopper unit is controlled (S5 to S14). For example, when all the fuel cells 11 to 15 are operated and five boost chopper units 31 to 35 are registered for operation (S5), the output voltage target value of each boost chopper unit 31 to 35 is set to DC 80V, respectively. Set (S6). Further, when one fuel cell 13 shown in FIG. 1 is operated and only the step-up chopper unit 33 connected thereto is registered for operation (S13), the output voltage target value is set to DC400V (S14). The boosting operation of one boosting chopper 33 is controlled in a state where the remaining four boosting choppers 31, 32, 34, 35 are stopped. As a result, the inverter unit 4 can input DC 400V stored in the output capacitor C of the boost chopper unit 33 through the diodes D2 and D1 on the + side and the diodes D5 and D4 on the − side.

従って、この実施形態の燃料電池給電システムによれば、次のような効果が得られる。
（イ）パワーコンディショナー２に燃料電池１１〜１５と同数の昇圧チョッパ部３１〜３５を設けたので、個々の昇圧チョッパ部の入力電流を小さくし、パワーコンディショナー２の損失を抑制できる。
（ロ）パワーコンディショナー２の出力が大きくなるほど、昇圧チョッパ部一台あたりの昇圧比が小さくなるため、昇圧運転の制御がしやすくなり、パワーコンディショナー２の動作が安定する。
（ハ）燃料電池部１の保守・点検時に、対象となる燃料電池１１〜１５に接続された昇圧チョッパ部３１〜３５のみを停止させることができ、給電システム全体をダウンさせることなく、メンテナンスを支障なく実施できる。
（ニ）運転中の燃料電池１１〜１５に接続された昇圧チョッパ部３１〜３５に登録台数に応じた出力電圧目標値を設定するので、給電システムを集合住宅７０側の電力需要の変動に合わせて経済的に稼動できる。
（ホ）燃料電池１１〜１５に１ｋｗ程度の普及型電池を使用したので、高価な補機類を共有して燃料電池部１を安価に設備できるとともに、小規模集合住宅の電力需要の変動に的確に対応できる。 Therefore, according to the fuel cell power feeding system of this embodiment, the following effects can be obtained.
(A) Since the same number of boost chopper units 31 to 35 as the fuel cells 11 to 15 are provided in the power conditioner 2, the input current of each boost chopper unit can be reduced and the loss of the power conditioner 2 can be suppressed.
(B) As the output of the power conditioner 2 is increased, the boost ratio per boost chopper is reduced, so that the boost operation can be easily controlled and the operation of the power conditioner 2 is stabilized.
(C) During maintenance and inspection of the fuel cell unit 1, only the boost chopper units 31 to 35 connected to the target fuel cells 11 to 15 can be stopped, and maintenance can be performed without bringing down the entire power feeding system. Can be carried out without hindrance.
(D) Since the output voltage target value corresponding to the number of registered units is set in the boost chopper units 31 to 35 connected to the fuel cells 11 to 15 in operation, the power feeding system is adjusted to the fluctuation of power demand on the apartment house 70 side. Can operate economically.
(E) Since a popular battery of about 1 kW is used for the fuel cells 11 to 15, the fuel cell unit 1 can be installed at low cost by sharing expensive auxiliary machinery, and the power demand of the small-scale housing complex can be changed. Can respond accurately.

尚、本発明は上記実施形態に限定されるものではなく、例えば、燃料電池及び昇圧チョッパ部の台数を電力消費ユニットの規模に応じて増減したり、複数の燃料電池の出力を相違させたりするなど、本発明の趣旨を逸脱しない範囲で各部の構成を適宜に変更して実施することも可能である。 In addition, this invention is not limited to the said embodiment, For example, the number of fuel cells and a pressure | voltage rise chopper part is increased / decreased according to the scale of an electric power consumption unit, or the output of several fuel cells is made different. For example, the configuration of each part can be changed as appropriate without departing from the spirit of the present invention.

本発明の一実施形態を示す燃料電池給電システムの回路図である。1 is a circuit diagram of a fuel cell power supply system showing an embodiment of the present invention. 図１の給電システムの制御部による処理を示すフローチャートである。It is a flowchart which shows the process by the control part of the electric power feeding system of FIG. 従来の燃料電池給電システムを示すブロック図である。It is a block diagram which shows the conventional fuel cell electric power feeding system. 従来の別の給電システムを示すブロック図である。It is a block diagram which shows another conventional electric power feeding system. 従来のパワーコンディショナーを示す回路図である。It is a circuit diagram which shows the conventional power conditioner.

符号の説明Explanation of symbols

１ 燃料電池部
２ パワーコンディショナー
３ 制御部
４ インバータ部
５ 連系部
１１〜１５ 燃料電池
３１〜３５ 昇圧チョッパ部
４１〜４５ 電圧検出器
DESCRIPTION OF SYMBOLS 1 Fuel cell part 2 Power conditioner 3 Control part 4 Inverter part 5 Interconnection parts 11-15 Fuel cells 31-35 Boost chopper parts 41-45 Voltage detector

Claims (1)

複数の燃料電池が出力した直流電力をパワーコンディショナーで交流電力に変換して複数の電力消費ユニットに供給する給電システムにおいて、パワーコンディショナーが各燃料電池に個別に接続された複数の昇圧チョッパ部と、各昇圧チョッパ部が直列に接続された一つのインバータ部と、各燃料電池の出力電圧を別々に検出する電圧検出部とを備え、パワーコンディショナーを制御する制御部が電圧検出部の検出値に基づいて燃料電池の運転台数を判別し、運転中の燃料電池に接続された昇圧チョッパ部に燃料電池の運転台数に応じた出力電圧目標値を設定することを特徴とする燃料電池給電システム。 In a power supply system that converts DC power output from a plurality of fuel cells into AC power by a power conditioner and supplies the AC power to a plurality of power consuming units, a plurality of boost chopper units in which the power conditioner is individually connected to each fuel cell; Each boost chopper unit includes one inverter unit connected in series and a voltage detection unit that separately detects the output voltage of each fuel cell, and the control unit that controls the power conditioner is based on the detection value of the voltage detection unit A fuel cell power supply system that determines the number of operating fuel cells and sets an output voltage target value corresponding to the number of operating fuel cells in a boost chopper connected to the operating fuel cell.
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