EP3146607A1 - Système d'injection d'une énergie électrique dans un réseau d'alimentation en courant et procédé de fonctionnement pour système de ce type - Google Patents

Système d'injection d'une énergie électrique dans un réseau d'alimentation en courant et procédé de fonctionnement pour système de ce type

Info

Publication number
EP3146607A1
EP3146607A1 EP15720261.5A EP15720261A EP3146607A1 EP 3146607 A1 EP3146607 A1 EP 3146607A1 EP 15720261 A EP15720261 A EP 15720261A EP 3146607 A1 EP3146607 A1 EP 3146607A1
Authority
EP
European Patent Office
Prior art keywords
power
power supply
voltage
converter
output
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Withdrawn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
EP15720261.5A
Other languages
German (de)
English (en)
Inventor
Alfred Gause
Bernhard Pfaff
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.)
AMK HOLDING GMBH & CO. KG
Original Assignee
AMK Arnold Mueller GmbH and Co KG
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 AMK Arnold Mueller GmbH and Co KG filed Critical AMK Arnold Mueller GmbH and Co KG
Publication of EP3146607A1 publication Critical patent/EP3146607A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • 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
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network

Definitions

  • the invention relates to a system for feeding electrical energy into a power supply network and an operating method for such a system.
  • Such systems are used, for example, for feeding the electrical energy generated by a photovoltaic system into the low-voltage power supply network.
  • each solar module is assigned as part of the photovoltaic system, an inverter which converts the photovoltaic DC voltage into a power grid synchronous
  • the invention has for its object to provide an improved system and associated operating method, which makes it possible to feed electrical energy that can be obtained as DC or AC voltage from different energy sources in an efficient manner in the power grid.
  • the technical apparatus and control engineering effort for the supply of electrical energy obtained from different energy sources to be reduced while still ensuring a high availability of the system and high reliability of the process with reduced external control effort.
  • This object is achieved by the system defined in claim 1 and by the method defined in the independent claim.
  • Particular embodiments of the invention are defined in the subclaims.
  • the system has an intermediate circuit, with the input side of which several current generators and / or current accumulators can be connected via a respective converter, and whose output side can be connected to the power supply network via an inverter.
  • the system has a voltage supply connected to the intermediate circuit and fed by the intermediate circuit for the operation of at least part of the electrical equipment of the system.
  • the power generators may be, for example, photovoltaic modules or fuel cells, or mechanically-electric generators, for example, wind turbines, water wheels or
  • Internal combustion engines which may also be part of a combined heat and power plant or a biogas plant.
  • In the power storage can be
  • the converters on the input side of the DC link may be
  • DC converters act, in particular for the connection of photovoltaic modules or electrochemical energy stores, or to inverters, preferably bidirectional inverters / or rectifiers, in particular for the connection of mechanical-electric generators.
  • a particular advantage of the system according to the invention is that the electrical energy obtained from different energy carriers is combined on a common intermediate circuit. This allows a central control of the feed of the various energy carriers.
  • Power supply system is self-sufficient and preferably no external power supply needed. Furthermore, the system recognizes autarkic when one of the power generators feeds energy into the system and can thus turn on automatically and switch off again automatically in the absence of energy input. The switching on can be effected exclusively by the introduction of energy into the system via the current generators, in particular triggered by the occurrence of a sufficiently high, possibly even unstabilized, voltage on the DC link. In one embodiment, the electrical voltage is on the
  • DC link which is preferably a DC link, more than 200 V, in particular more than 300 V and preferably more than 400 V.
  • the voltage is between 500 V and 800 V, in particular about 600 V.
  • the electrical energy obtained from different energy sources is particularly advantageous in the
  • Power supply grid feedable For example, the
  • the power converters and / or the output-side power converters and / or a control unit of the system is connected to the voltage supply supplied by the DC link.
  • the power supply can be the supply of all controllable components and resources of the system
  • Power supply the power consumption of the system is essentially zero.
  • the system preferably removes the electrical energy necessary for its operation by more than 50% or even
  • the output converter converts, in particular in a stabilized DC voltage.
  • the voltage supply provides at least one stabilized DC voltage with a rated voltage of less than 120 V, in particular less than 60 V and preferably 24 V.
  • all components of the system essential for the control can be supplied with electrical energy from the power supply.
  • the invention also relates to a method for operating such
  • system wherein in one embodiment, the system based on a turned off state, in particular starting from a
  • the system After activation of the power supply, the system takes a synchronization of the output side converter with the
  • the power grid includes a public power grid and a local area network, both with the
  • Inverters are connectable.
  • the system has a controllable disconnecting switch arranged between the inverter and the public power grid, by means of which the inverter
  • the system can be self-sufficient, for example when detecting a fault on the public power grid or failure of the
  • the system switches in the case of island operation, in which the output-side converter from the public
  • Power supply network is disconnected and the system feeds electrical energy into the local network, the occurrence of an electrical overload on the output side converter from and preferably after a predetermined period of time also automatically on again. This enables the system to autonomously respond to an overload and automatically disconnect from the grid and then start up again. It is advantageous if the generator is operated by the system during the shutdown of the system from the grid at idle, even to provide the system with electrical energy.
  • the output side stabilizes in particular
  • the DC link is used as a short-term energy storage, also to even the load on the power generator to equalize.
  • the speed control of the power generator is preferably carried out via the input-side converter. occurring
  • FIG. 1 shows an embodiment of a system according to the invention
  • Figs. 2 to 4 show different operating states of another
  • Fig. 1 shows an embodiment of a system 1 according to the invention for feeding electrical energy into a power grid 2.
  • the power grid 2 consists in the embodiment of a public three-phase power grid 4 and a local three-phase network 6, for example, for the supply of a residential building or a farm.
  • Both subnetwork 4, 6 have a matching low voltage level 230/380 V.
  • the system 1 has an electrical intermediate circuit 10, in
  • Embodiment a DC intermediate circuit, with its input side in the embodiment, two current generators 12, 14 and a current memory 16 via a respective power converter 22, 24, 26 are connected, and its output side via an output side converter 20, in the case of a DC link via a
  • the system 1 has a modular design and can be extended, in particular in the manner of a construction kit, by further power converters for the connection of further current generators or current storages.
  • the first power generator 12 has two solar modules 18, the
  • the second power generator 14 is a preferably permanent-magnet synchronous generator, which may be convection-cooled or liquid-cooled; Alternatively or additionally, an asynchronous generator can be used as a current generator.
  • the second power generator 14 may be driven, for example, by an internal combustion engine, which in turn may be operated with biogas or other biologically produced or even a fossil fuel.
  • the second power generator 14 may also be driven, for example, by a wind turbine or a water turbine.
  • the second current generator 14 supplies a three-phase in the exemplary embodiment
  • the second power converter 24 may have a load-dependent vector control of the second generator 14 sensorless for optimum energy utilization.
  • the power storage 16 is in the embodiment to a battery of electrochemical energy storage, for example, a high-voltage battery with a rated voltage of more than 100 V in
  • the power storage 16 is via the third power converter 26, which is a bidirectional
  • DC-DC converter is connected to the intermediate circuit 10.
  • the intermediate circuit 10 On the output side, the intermediate circuit 10 via an output-side converter 20, which in the exemplary embodiment is a
  • Inverter is that converts the DC voltage of the DC link 10 in a three-phase AC voltage with the
  • the output-side converter 20 can be any within its power range
  • the System 1 can automatically regulate.
  • Power supply network 2 is fully automatic. To compensate for an optionally phase unbalanced load of
  • Power supply network 2 the system can have 1 balancing elements. Between the output-side converter 20 and the power supply network 2, a transformer 28 is arranged.
  • the system 1 has a control unit 30, which is connected via unidirectional or bidirectional control lines to the input-side converters 22, 24, 26 and to the output-side converter 20.
  • the control unit 30 is directly on
  • control unit 30 is further connected via a
  • Network connection line 32 is connected to the public power grid 4 and therefore can detect a failure or failure of the public power grid 4.
  • the control unit 30 is connected to a circuit breaker 34 and can disconnect the system 1 in a fault, preferably all-pole from the public power grid 4.
  • the control unit 30 has an optionally wireless interface 36 for connection to a public data network 38. Via the public data network 38, the control unit 30 can preferably exchange bidirectional data with a terminal 40 that is connected to the public data network 38.
  • Parallel to the electrical intermediate circuit 10, the system 1 may have a heat circuit, not shown in FIG. 1, which may be branched similar to the electrical intermediate circuit 10, in particular may be connected to the heat circuit several or even all power converters 20, 22, 24, 26 be and dissipate their waste heat to the heat circuit.
  • Power storage 16 may be connected to the heat circuit.
  • the heat circle The system 10 can be used as a thermal energy source either only within the system 1 or have a connection to a secondary heating network, in particular to a local heating network, for example, supply of living space or hot water provision.
  • FIGS. 2 to 4 show different operating states of a further exemplary embodiment of the system 1 according to the invention.
  • FIG. 2 shows the system 1, for example in an off state, in which the system 1 does not require an external power supply.
  • Disconnector 34 is open, recognizes the system 1 via the
  • Network link 32 the presence of a public
  • Power supply network 4 In the network connection line 32, a manually or automatically operated by the control unit 30 of the system 1 switch 44 is arranged, which is closed in the state of Fig. 2. The closed state of the switch 44 gives the control unit 30 the possibility to synchronize to the mains voltage after starting the system 1 and to close the circuit breaker 34 and thus to run a grid parallel operation. In contrast, an open switch 44 indicates that no network parallel operation is possible or desired, but an isolated operation of the local area network 6 by the system 1 is connected only to the local network 6.
  • the second power generator 14 is connected to the system 1 via the second power converter 24, which in the illustrated
  • Embodiment of an internal combustion engine 46 is driven.
  • a power supply 42 is connected, which on your output side a DC voltage of in
  • Embodiment provides 24 V as a system voltage, with which the various components and electrical equipment of the system 1 are supplied with electrical energy.
  • the exemplary embodiment is at the power supply 42 to a switching power supply.
  • the second current generator 14 initially generates an electrical voltage on the intermediate circuit 10 uncontrolled activated, which in turn provides the output side, the supply voltage for the components and resources of the system 1, including the control unit 30. Then recognizes the control unit 30 via the network connection line 32 the queuing of the public power grid 4 and closes after synchronization of the output side converter 20th generated AC voltage to the public
  • the system 1 is thus able to start autonomously and to connect to the public power grid 4.
  • the second power generator 14 may also be set in motion, for example, by the advent of wind or by the flow of water through a water turbine connected to the second power generator 14.
  • Internal combustion engine 46 comes to a standstill or the solar radiation or the wind subsides, the electric voltage drops to the
  • the output-side converter 20 is switched off by the control unit 30. Accordingly, no Energy is fed into the power grid 2. If the voltage drops to the intermediate circuit 10 below a second voltage value, the power supply 42 is turned off and thus the system 1 is switched off altogether, which then goes into a stand-by mode, the power consumption of the system 1 in stand-by mode preferably is essentially zero.
  • the system 1 detects a loss of the public power supply network 4, or if such a failure is simulated by opening the switch 44 or the separation is to be controlled by the public power supply network 4, the system 1 opens the circuit breaker 34 and thus separates the system 1 from the public power grid 4.
  • Power generators 12, 14 or by the power storage 16 on the input side sufficient electrical energy is provided. This corresponds to the operating state of FIG. 4.
  • the further supply of the local network 6 when disconnected from the public power grid 4 takes place without appreciable load interruption, in particular the duration of the switching operation is less than 1 second, in particular less than 0.5 seconds, and preferably less than 0 , 1 second.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

L'invention concerne un système (1) d'injection d'une énergie électrique dans un réseau d'alimentation en courant (2). Le système (1) comprend un circuit intermédiaire électrique (10), au côté d'entrée duquel plusieurs générateurs de courant (12, 14) et/ou accumulateurs de courant (16) peuvent être reliés par l'intermédiaire de respectivement un convertisseur (22, 24, 26), et dont le côté de sortie peut être relié au réseau d'alimentation en courant (20) par l'intermédiaire d'un convertisseur (20) côté sortie. Le système (1) comprend en outre une alimentation électrique (42) raccordée au circuit intermédiaire (10) et alimentée par le circuit intermédiaire (10), pour le fonctionnement d'au moins une partie des composants électriques et des moyens de fonctionnement du système (1). L'invention concerne également un procédé de fonctionnement d'un système de ce type.
EP15720261.5A 2014-05-22 2015-04-17 Système d'injection d'une énergie électrique dans un réseau d'alimentation en courant et procédé de fonctionnement pour système de ce type Withdrawn EP3146607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014007640.7A DE102014007640A1 (de) 2014-05-22 2014-05-22 System zur Einspeisung elektrischer Energie in ein Stromversorgungsnetz und Betriebsverfahren für ein solches System
PCT/EP2015/000806 WO2015176789A1 (fr) 2014-05-22 2015-04-17 Système d'injection d'une énergie électrique dans un réseau d'alimentation en courant et procédé de fonctionnement pour système de ce type

Publications (1)

Publication Number Publication Date
EP3146607A1 true EP3146607A1 (fr) 2017-03-29

Family

ID=53051784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15720261.5A Withdrawn EP3146607A1 (fr) 2014-05-22 2015-04-17 Système d'injection d'une énergie électrique dans un réseau d'alimentation en courant et procédé de fonctionnement pour système de ce type

Country Status (3)

Country Link
EP (1) EP3146607A1 (fr)
DE (1) DE102014007640A1 (fr)
WO (1) WO2015176789A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110912183B (zh) * 2019-10-31 2023-12-22 格瑞美科技(武汉)有限公司 一种含多种类型可再生能源的发电系统拓扑结构

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10136147B4 (de) * 2001-07-25 2004-11-04 Kolm, Hendrik, Dipl.-Ing. Photovoltaischer Wechselstromerzeuger
AT505143B1 (de) * 2007-05-14 2012-03-15 Fronius Int Gmbh Verfahren zur steuerung eines wechselrichters und wechselrichter
DK2363947T3 (da) * 2010-03-03 2012-08-06 Sma Solar Technology Ag Vekselretter med elsystem med flere forsyninger
EP2614576B1 (fr) * 2010-09-10 2018-10-10 Sew-Eurodrive GmbH & Co. KG Système local de distribution d'énergie comportant un circuit intermédiaire
DE102010055486A1 (de) * 2010-12-22 2012-06-28 Diehl Ako Stiftung & Co. Kg Solarmodul und Verfahren
EP2759033B1 (fr) * 2011-09-20 2017-04-05 SMA Solar Technology AG Mise au point d'une puissance de réglage avec une installation photovoltaïque
DE102013111608A1 (de) * 2012-10-31 2014-03-27 Sma Solar Technology Ag Photovoltaikanlage mit Speicherbatterie und Nachrüstsatz für eine Photovoltaikanlage
DE102012023426A1 (de) * 2012-11-29 2014-03-13 Kostal Industrie Elektrik Gmbh Elektrische Anordnung und elektrische Anlage mit einer elektrischen Anordnung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015176789A1 *

Also Published As

Publication number Publication date
WO2015176789A1 (fr) 2015-11-26
DE102014007640A1 (de) 2015-11-26

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