DE10304792A1 - Voltage supply regulation system for array of fuel cells includes DC/DC converter and AC/DC converter connected to low-voltage network - Google Patents

Voltage supply regulation system for array of fuel cells includes DC/DC converter and AC/DC converter connected to low-voltage network

Info

Publication number
DE10304792A1
DE10304792A1 DE10304792A DE10304792A DE10304792A1 DE 10304792 A1 DE10304792 A1 DE 10304792A1 DE 10304792 A DE10304792 A DE 10304792A DE 10304792 A DE10304792 A DE 10304792A DE 10304792 A1 DE10304792 A1 DE 10304792A1
Authority
DE
Germany
Prior art keywords
converter
fuel cell
low
voltage
fuel cells
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE10304792A
Other languages
German (de)
Inventor
Bodo Oerder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vaillant GmbH
Original Assignee
Vaillant GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaillant GmbH filed Critical Vaillant GmbH
Priority to DE10304792A priority Critical patent/DE10304792A1/en
Publication of DE10304792A1 publication Critical patent/DE10304792A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04865—Voltage
    • H01M8/0488—Voltage of fuel cell stacks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/30—The power source being a fuel cell
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Fuel Cell (AREA)

Abstract

The fuel cell assembly (7) includes an array of individual fuel cells (8) and an internal user. The fuel cells produce direct current which passes through diodes (6) to prevent reverse flow of current. The current feeds the input side (51) of a DC/DC converter (5). The current from the output side (52) of the DC/DC converter is fed to a DC user circuit in the fuel cell assembly (9). The fuel cell is connected to the DC side (22) of an AC/DC converter (2). The AC side (21) is connected to a low-voltage AC network (1).

Description

Die Erfindung bezieht sich auf eine Eigenspannungsversorgung für eine Brennstoffzellenvorrichtung mit einem Brennstoffzellenstapel und Eigenverbrauchern. The invention relates to a power supply for a Fuel cell device with a fuel cell stack and self-consumers.

Derartige Eigenverbraucher werden meist mit Gleichstrom betrieben. Brennstoffzellen liefern Gleichstrom, wobei die Zellspannung von der mehreren Faktoren abhängt. Dies hat zur Folge, dass die Spannung des Brennstoffzellenstapels schwankt und nicht direkt mit den Eigenverbrauchern verbunden werden kann. Such self-consumers are mostly operated with direct current. Deliver fuel cells DC, where the cell voltage depends on several factors. This has to As a result, the voltage of the fuel cell stack fluctuates and not directly with the Own consumers can be connected.

Brennstoffzellenvorrichtung gemäß dem Stand der Technik verfügen über einen DC/AC- Wandler, der den Gleichstrom des Brennstoffzellenstapels in Wechselstrom für das Niederspannungsnetz wandelt. Ein davon getrennter AC/DC-Wandler wandelt den Wechselstrom des Niederspannungsnetzes in Gleichstrom für die Eigenverbraucher. Dies hat zur Folge, dass die Eigenverbraucher mit relativ schlechtem Wirkungsgrad betrieben werden, da der benötigte Strom zweimal gewandelt wird. Prior art fuel cell devices have a DC / AC Converter that converts the direct current of the fuel cell stack into alternating current for the Low voltage grid is changing. A separate AC / DC converter converts the Alternating current of the low-voltage network in direct current for self-consumption. This has the consequence that own consumers operate with relatively poor efficiency because the required electricity is converted twice.

Aufgabe der vorliegenden Erfindung ist daher, eine Eigenspannungsversorgung für eine Brennstoffzellenvorrichtung mit einem Brennstoffzellenstapel und Eigenverbrauchern mit hohem Wirkungsgrad zu schaffen. The object of the present invention is therefore to provide an internal voltage supply for a Fuel cell device with a fuel cell stack and own consumers with to create high efficiency.

Erfindungsgemäß wird dies dadurch erreicht, dass die Ausgangsspannung des Brennstoffzellenstapels nur unter Zwischenschaltung eines Spannungswandlers direkt mit den Eigenverbrauchern verbunden wird. Dadurch werden die Umwandlungsverluste minimiert. According to the invention this is achieved in that the output voltage of the Fuel cell stack directly with the interposition of a voltage converter is connected to own consumers. This will result in conversion losses minimized.

Gemäß den Merkmalen der Ansprüche 2 und 3 ergibt sich der Vorteil, dass die Brennstoffzellenvorrichtung unter anderem auch gestartet werden kann. Manche Vorrichtungen gemäß dem Stand der Technik sehen hierfür Batterien zur Bereitstellung der Energie für die Eigenverbraucher vor. Erfindungsgemäß wird ein AC/DC-Wandler vorgesehen, der einerseits für die Wandlung von 230 V Wechselstrom aus dem Niederspannungsnetz in Gleichstrom für die Eigenverbraucher, andererseits zur Wandlung des Gleichstroms aus dem Brennstoffzellenstapel für das Niederspannungsnetz vorgesehen ist. According to the features of claims 2 and 3, there is the advantage that the Fuel cell device can also be started, among other things. Some Devices according to the prior art provide batteries for this purpose Energy for self-consumption. According to the invention, an AC / DC converter provided that on the one hand for the conversion of 230 V alternating current from the Low-voltage network in direct current for own consumers, on the other hand for conversion of the direct current from the fuel cell stack provided for the low-voltage network is.

Gemäß den Merkmalen des Anspruchs 4 ergibt sich der Vorteil, dass kein Strom zum Brennstoffzellenstapel fließen kann. According to the features of claim 4, there is the advantage that no current to Fuel cell stack can flow.

Die Erfindung wird nun anhand der Zeichnung näher erläutert. Dabei zeigt The invention will now be explained in more detail with reference to the drawing. It shows

Fig. 1 eine Brennstoffzellenvorrichtung mit Eigenspannungsversorgung. Fig. 1 shows a fuel cell device with internal voltage supply.

Fig. 1 zeigt eine Brennstoffzelleneinheit 7 mit Brennstoffzellenstapel 8 und Eigenverbrauchern 9. Die Eigenverbraucher 9 sind mit der Ausgangsseite 52 eines DC/DC- Wandlers 5; die Eingangsseite 51 des DC/DC-Wandlers 5 ist mit der Gleichstromseite 22 eines AC/DC-Wandlers 2 und die Eingangsseite 21 des AC/DC-Wandlers 2 mit einem Niederspannungsnetz 1 verbunden. Der Brennstoffzellenstapel 8 ist parallel zwischen die Gleichstromseite 22 des AC/DC-Wandlers 2 und die Eingangsseite 51 des DC/DC-Wandlers 5 geschaltet. In den Verbindungsleitungen des Brennstoffzellenstapels 8 befinden sich Dioden 6. Fig. 1 shows a fuel cell unit with the fuel cell stack 7 and 8 own consumers. 9 The self-consumers 9 are connected to the output side 52 of a DC / DC converter 5 ; the input side 51 of the DC / DC converter 5 is connected to the direct current side 22 of an AC / DC converter 2 and the input side 21 of the AC / DC converter 2 is connected to a low-voltage network 1 . The fuel cell stack 8 is connected in parallel between the direct current side 22 of the AC / DC converter 2 and the input side 51 of the DC / DC converter 5 . Diodes 6 are located in the connecting lines of the fuel cell stack 8 .

Soll die Brennstoffzellenvorrichtung gestartet werden, so wird vom Niederspannungsnetz 1 über den AC/DC-Wandler 2 und den DC/DC-Wandler 5 den Eigenverbrauchern 9 Strom zur Verfügung gestellt. Die Dioden 6 vermeiden, dass Strom zu dem Brennstoffzellenstapel 8 fließen kann. Die Brennstoffzellenvorrichtung kann somit hochgefahren werden und beginnt mit der Stromproduktion. Der produzierte Strom kann einerseits über den DC/DC-Wandler 5 zur Versorgung der Eigenverbrauchern 9 genutzt werden. Der darüber hinausgehende Strom wird in dem DC/DC-Wandler 5 den Eigenverbrauchern 9 in 230 V 50 Hz umgewandelt und in das Niederspannungsnetz 1 eingespeist. If the fuel cell device is to be started, the low-voltage network 1 provides the internal consumers 9 with power via the AC / DC converter 2 and the DC / DC converter 5 . The diodes 6 prevent current from flowing to the fuel cell stack 8 . The fuel cell device can thus be started up and begins to produce electricity. The electricity produced can be used on the one hand via the DC / DC converter 5 to supply the self-consumers 9 . The current going beyond this is converted in the DC / DC converter 5 to the self-consumers 9 in 230 V 50 Hz and fed into the low-voltage network 1 .

Claims (4)

1. Eigenspannungsversorgung für eine Brennstoffzellenvorrichtung mit einem Brennstoffzellenstapel (8) und Eigenverbrauchern (9), dadurch gekennzeichnet, dass der Brennstoffzellenstapel (8) mit der Eingangsseite (51) eines DC/DC-Wandler (5) verbunden ist und die Eigenverbrauchern (9) der Ausgangsseite (52) des DC/DC- Wandler (5) verbunden sind. 1. power supply for a fuel cell device with a fuel cell stack ( 8 ) and self-consumers ( 9 ), characterized in that the fuel cell stack ( 8 ) is connected to the input side ( 51 ) of a DC / DC converter ( 5 ) and the self-consumers ( 9 ) the output side ( 52 ) of the DC / DC converter ( 5 ) are connected. 2. Eigenspannungsversorgung für eine Brennstoffzellenvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Eingangsseite (51) des DC/DC-Wandlers (5) mit der Gleichstromseite (22) eines AC/DC-Wandlers (2) verbunden ist. 2. Internal voltage supply for a fuel cell device according to claim 1, characterized in that the input side ( 51 ) of the DC / DC converter ( 5 ) is connected to the direct current side ( 22 ) of an AC / DC converter ( 2 ). 3. Eigenspannungsversorgung für eine Brennstoffzellenvorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die Wechselstromseite (21) des AC/DC-Wandlers (2) mit dem Niederspannungsnetz (1) verbunden ist. 3. Internal voltage supply for a fuel cell device according to claim 2, characterized in that the AC side ( 21 ) of the AC / DC converter ( 2 ) is connected to the low-voltage network ( 1 ). 4. Eigenspannungsversorgung für eine Brennstoffzellenvorrichtung gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass zwischen dem Brennstoffzellenstapel (8) und der Eingangsseite (51) eines DC/DC-Wandler (5) mindestens eine Diode (6) geschaltet sind. 4. Internal voltage supply for a fuel cell device according to one of claims 1 to 3, characterized in that at least one diode ( 6 ) are connected between the fuel cell stack ( 8 ) and the input side ( 51 ) of a DC / DC converter ( 5 ).
DE10304792A 2002-02-12 2003-02-06 Voltage supply regulation system for array of fuel cells includes DC/DC converter and AC/DC converter connected to low-voltage network Withdrawn DE10304792A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10304792A DE10304792A1 (en) 2002-02-12 2003-02-06 Voltage supply regulation system for array of fuel cells includes DC/DC converter and AC/DC converter connected to low-voltage network

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10206638 2002-02-12
AT18682002 2002-12-16
DE10304792A DE10304792A1 (en) 2002-02-12 2003-02-06 Voltage supply regulation system for array of fuel cells includes DC/DC converter and AC/DC converter connected to low-voltage network

Publications (1)

Publication Number Publication Date
DE10304792A1 true DE10304792A1 (en) 2003-10-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005036684A2 (en) * 2003-10-10 2005-04-21 Nuvera Fuel Cells, Inc. Power electronics for fuel cell power system
WO2006037746A2 (en) * 2004-10-06 2006-04-13 Siemens Aktiengesellschaft Device and method for starting and operating a fuel cell installation
EP2087546A1 (en) * 2006-11-28 2009-08-12 Fuelcell Power Inc. Fuel cell system including reliable power distributor
EP2294494A1 (en) * 2008-06-13 2011-03-16 Ceramic Fuel Cells Limited Fuel cell stabilisation system and method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005036684A2 (en) * 2003-10-10 2005-04-21 Nuvera Fuel Cells, Inc. Power electronics for fuel cell power system
WO2005036684A3 (en) * 2003-10-10 2005-06-30 Nuvera Fuel Cells Inc Power electronics for fuel cell power system
WO2006037746A2 (en) * 2004-10-06 2006-04-13 Siemens Aktiengesellschaft Device and method for starting and operating a fuel cell installation
WO2006037746A3 (en) * 2004-10-06 2006-07-20 Siemens Ag Device and method for starting and operating a fuel cell installation
EP2087546A1 (en) * 2006-11-28 2009-08-12 Fuelcell Power Inc. Fuel cell system including reliable power distributor
EP2087546A4 (en) * 2006-11-28 2011-02-16 Fuelcell Power Inc Fuel cell system including reliable power distributor
EP2294494A1 (en) * 2008-06-13 2011-03-16 Ceramic Fuel Cells Limited Fuel cell stabilisation system and method
EP2294494A4 (en) * 2008-06-13 2012-11-14 Ceramic Fuel Cells Ltd Fuel cell stabilisation system and method

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