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WO2020099055A1 - Installation de transformation d'un réseau de distribution électrique ainsi que procédé de fonctionnement d'une installation de transformation - Google Patents

Installation de transformation d'un réseau de distribution électrique ainsi que procédé de fonctionnement d'une installation de transformation Download PDF

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Publication number
WO2020099055A1
WO2020099055A1 PCT/EP2019/077931 EP2019077931W WO2020099055A1 WO 2020099055 A1 WO2020099055 A1 WO 2020099055A1 EP 2019077931 W EP2019077931 W EP 2019077931W WO 2020099055 A1 WO2020099055 A1 WO 2020099055A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage distribution
voltage
switch
substation according
substation
Prior art date
Application number
PCT/EP2019/077931
Other languages
German (de)
English (en)
Inventor
Rainer Bunselmeyer
Mario Jaschke
Laura Modic
Original Assignee
Westnetz 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 Westnetz Gmbh filed Critical Westnetz Gmbh
Priority to EP19789929.7A priority Critical patent/EP3881412A1/fr
Publication of WO2020099055A1 publication Critical patent/WO2020099055A1/fr

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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/46—Controlling of the sharing of output between the 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
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads

Definitions

  • the subject matter relates to a substation of an energy supply network and a method for operating a substation.
  • Network restoration requires a variety of operations to be performed
  • the network operator of the network operator must have information from the substations available.
  • remote access to the switching devices of the substations must be guaranteed by the network-managing body.
  • an uninterruptible power supply must be available for at least the control technology and the
  • the transformer is located downstream
  • a lead-acid battery is generally assigned to each DC voltage level, which guarantees an uninterrupted power supply of twelve hours.
  • the alternating current distribution known from the prior art which is in particular a three-phase current distribution, is objectively modified so that an uninterruptible power supply is possible for a long time.
  • the energy supply via the generator which can be fed in particular from a renewable energy source, and the energy store are guaranteed.
  • the switch be disconnected from the mains.
  • the grid separation means that the AC voltage distribution is disconnected from the power supply network after a power failure.
  • Energy storage is given a frequency in the AC voltage distribution and an island grid is created.
  • the frequency specification ensures that the generator's inverter can continue to feed into the AC voltage distribution.
  • Such consumers which can be dispensed with in the event of a power failure, can be integrated in an upstream voltage distribution. This voltage distribution is followed by the AC voltage distribution to which the consumers are connected, which should continue to be supplied in the event of a power failure. It is proposed to place the switch between these two distributions.
  • the generator and the energy store are preferably connected to the downstream AC voltage distribution.
  • a transformer can be arranged within a substation, which serves to supply the protective, control and message technology.
  • Transformer can be designed as a self-made transformer. On the output side of the transformer is the AC voltage distribution, via which the secondary technology of the substation is supplied. It is proposed to connect the transformer on the primary side to an energy supply network and indirectly or directly on the secondary side to the AC voltage distribution.
  • the switch can be arranged indirectly or directly on the secondary connection of the transformer. It is also possible to arrange the switch on the primary side of the transformer.
  • a secondary switching unit can especially a medium voltage field switch unit or a compact one
  • the secondary switching unit can be regarded as a so-called priority 1 consumer, which must be activated in the event of network restoration.
  • a connection of a battery inverter of an energy store is connected to the AC voltage distribution. At least one secondary switching unit and an energy store are thus connected directly or indirectly via a battery inverter via the AC voltage distribution.
  • a grid-guided inverter of the generator is also connected to the AC voltage distribution.
  • the lower limit can be, in particular for one
  • Power failure can also be 0 V. It is also proposed that the battery inverter have a frequency depending on the switch position of the switch
  • the battery inverter switches to self-controlled operation and can specify a frequency for the AC voltage distribution. If the switch at a
  • Power supply network in particular above an upper limit, closed again, so during or shortly before the switch is closed
  • a grid-guided inverter depending on the frequency impressed by the battery inverter feeds an electrical power of a generator into the AC voltage distribution.
  • a grid-connected inverter is connected to the AC voltage distribution, which is connected on the input side to a generator and can thus feed electrical power into the AC voltage distribution.
  • the switch opens, the substation is disconnected from the power supply network. This is regularly the case if the substation is located in a spatial area of a failed power supply network.
  • the Input frequency below a lower limit can in particular also be 0 volts and / or 0 hertz.
  • the switch opens when the lower limit is detected. Thereupon, in particular triggered by the open switch position, the battery inverter gives a frequency for the
  • This frequency is usually the network frequency, which is 50 Hz in Europe and 60 Hz in the USA.
  • the grid-guided inverter can feed the generator power into the AC voltage distribution and thus feed consumers at the AC voltage distribution, as well as the state of charge of the
  • the generator In the event of a power failure, the generator is able to supply the necessary secondary technical components with energy in order to increase the availability of the substation in the event of a network restoration.
  • the secondary switching unit have at least one protective control module or one field connection unit, in particular comprising one Field unit and / or a protection module.
  • a protective control module can be part of a medium-voltage field connection unit.
  • a field interface unit can provide control and protection technology.
  • Primary technical switching devices can be controlled via a field connection unit.
  • servomotors of the electric coils and transformers can be controlled and supplied with electrical energy.
  • a plurality of secondary switching units can be connected to the AC voltage distribution.
  • protection technology can also be connected to the
  • the station control system combines the data streams from the substation and transmits them to the network control system and receives from it
  • the network control center can check the current status of the substation, e.g. Detect switching positions and load flows and make decisions based on them and, if necessary, trigger appropriate switching actions.
  • a communication technology in particular communications technology components and / or control technology components, be sent to the via a first rectifier
  • a substation generally has a plurality of primary technical switching units and components, each of which is controlled by secondary technical switching units. To maintain the operational readiness of the substation in the event of a power failure, all are decisive
  • components of the protective technology can also be connected to the AC voltage distribution.
  • this protection technology be connected to the AC voltage distribution via a second rectifier. Protection technology protects the equipment installed in the substation against impermissibly high loads, especially in the event of short circuits and earth faults.
  • Protection technology can in particular be line protection, transformer protection and busbar protection. Protection technology is usually operated at a different voltage level than the voltage level of the AC voltage distribution.
  • the protection technology consists in particular of direct current components that are directly connected to the rectifier connected in the alternating voltage distribution
  • the protection technology can be switched off.
  • protective technology is generally not necessary. Since neither a ground fault nor a short circuit can occur in the event of a power failure, and line protection or contact protection is not necessary, since the power supply network is already dead, the protection technology can also be taken out of operation in the event of a power failure. For this reason, it is proposed that the protection technology can be switched off depending on a voltage and / or a frequency in the AC voltage distribution or depending on a state of charge of the energy store. Protection technology can also be used in their
  • the energy store is preferably fully charged in normal operation, that is to say when mains voltage is present. In such a case, the energy store preferably does not discharge in the event of a grid failure, but if the generator does not
  • the energy storage unit feeds the contactor, control and / or communications technology components connected to the AC voltage distribution and discharges.
  • the state of charge of the energy store therefore drops. If such a drop in the state of charge occurs, the protection technology can be switched off, for example, from a certain state of charge of the energy store.
  • the protection technology can be switched off, for example, when the necessary condition that a power failure has occurred is met, in particular that the switch is open and, in addition, the sufficient condition that a voltage and / or a frequency within the AC voltage distribution and / or a state of charge of the energy storage falls below a limit value. If both conditions are met, the protection technology can be switched off. By switching off the protection technology, it does not consume any further electrical energy and the energy storage is thus discharged more slowly. As a result, it is possible to significantly reduce the power requirement of the substation in the network restoration and to increase the bridging time. In particular, direct current consumers of protective technology are switched off under the above-mentioned conditions.
  • the communications technology components are preferably operated at a different DC voltage level than the protection technology. It is therefore proposed that the first rectifier have a first output voltage and / or that the second rectifier have a second output voltage that is different from the first output voltage.
  • the first output voltage is for example in the range between 40 V and 60 V, for example 48 V and the second
  • Output voltage for example in the range between 150 V and 300 V
  • the AC voltage distribution is operated, for example, at a voltage of 400 V.
  • the energy store is a lithium ion
  • a power flow monitor is provided between the AC voltage distribution and the power supply network. With the help of the power flow monitor, it is possible to monitor a power flow between the AC voltage distribution and the energy supply network. In the consumer arrow system, normal power flows from the power supply network into the AC voltage distribution during normal operation. In the event of a voltage drop in the
  • Energy supply network would flow electrical power from the generator via the inverter and the AC voltage distribution into the energy supply network. This is prevented by the power flow monitor. Measures
  • Power flow monitor for example, a negative power flow
  • the power flow monitor can be formed, for example, by a smart meter.
  • Components such as motors are supplied with electrical energy via the AC voltage distribution.
  • the AC voltage distribution be three-phase, and in particular that the
  • Battery inverter feeds the AC voltage distribution in three phases.
  • the AC voltage distribution is then a three-phase distribution. This is
  • motorized control elements for example a transformer actuator or a motor-operated switch.
  • the secondary switching unit is preferably three-phase to the
  • the generator comprise a photovoltaic system. With the help of the photovoltaic system, it is possible to extract electrical energy from solar energy and transfer it into the
  • the photovoltaic system is used to supply consumers to the
  • the substation therefore has a longer availability in the event of a network failure, so that network restoration is possible for a longer period of time.
  • Fig. 1 a transformer station according to an embodiment.
  • FIG. 1 shows an example of a 10 kV substation 2 with a switchgear 4. Only those relevant to the object are considered for further consideration
  • An in-house transformer 6 is on the primary side single-phase or three-phase to the power supply network in the
  • the own-use transformer 6 has a three-phase connection to a first on the secondary side
  • the AC voltage of the first AC voltage distribution can be, for example, 400 V.
  • AC voltage distribution which can be implemented via at least one busbar, can be connected to a wide variety of consumers 8 which are not safety-relevant and therefore do not require an uninterruptible power supply in the event of a power failure.
  • a power flow monitor 10 and a switch 12 are connected with their inputs to the secondary-side output of the own-use transformer 6 and / or the first AC voltage distribution.
  • the output side of the switch 12 and the power flow monitor 10 is one
  • AC voltage distribution 14 for example connected via a busbar, single-phase or three-phase.
  • Secondary switching units 16 are directly connected to the AC voltage distribution 14.
  • the connection of the switching units 16 can be single-phase and / or three-phase.
  • a single switching unit 16 is shown, but a large number of switching units 16 are possible.
  • components of the process level can be controlled directly.
  • Elements of the primary technology, such as e.g. Motors of the transformer tap changer and the E-coils can be controlled.
  • the communications technology components 20 are operated at DC voltage, in particular at a voltage between 30 V DC and 60 V DC, in particular 48 V DC.
  • the telecommunications components 20 enable communication between the
  • Station management level and the field management level in particular via a local one
  • Station control level takes place via optical fibers and / or copper cables. Communication between the station control level and the field control level takes place via optical fibers and / or copper cables.
  • the network control level In the event of a network failure, it is necessary for the network control level to have information about the individual stations and their status. It is therefore necessary for the communications technology components 20 to be connected to an uninterruptible power supply via the AC voltage distribution 14. Furthermore, it is necessary that the network control level and / or the station control level on the
  • Field control level can access and trigger switching operations there. For this retroactive effect from the management level, it is necessary that the
  • telecommunications components 20 have an uninterruptible power supply.
  • the uninterruptible power supply is initially a
  • Battery inverter 22 realized.
  • the battery inverter 22 can be operated bidirectionally. This makes it possible to charge and discharge an energy store 24, in particular a lithium ion store.
  • protection modules are provided, such as a
  • the protection technology 26 is operated with a higher DC voltage than the communications technology components 20, the DC voltage is, for example, between 150 V DC and 300 V DC, in particular at 212 V DC.
  • the TENAB circuit 28 can be activated, for example, as a function of the frequency on the AC voltage distribution 14 and / or the state of charge of the lithium-ion memory 24 and / or the switch position of the switch 12, such that, for example, with an open switch 12 and a lower one State of charge of the energy store 24 and / or a lower frequency
  • AC voltage distribution 14 opens the TENAB circuit 28 and thereby the protection technology 26 connected to it is switched off. This means that in the event of a power failure, the bridging time is increased considerably because the
  • Protection technology 26 receives no further power and the energy storage 24 must provide less power.
  • Inverter 32 connected, which is connected to a generator 34, for example a photovoltaic system in the present case.
  • the inverter 32 feeds electrical power from the generator 34 into the AC voltage distribution 14 at the frequency specified by the battery inverter 22.
  • the switch 12 In normal operation, the switch 12 is closed.
  • the energy store 24 is charged by electrical power from the energy supply network and its state of charge is kept at a certain level, for example 90% or higher. If necessary, the energy store 24 is also charged via the generator 34.
  • AC voltage distribution 14 is conducted via the transformer 6 in the higher-level power supply network.
  • the switch 12 can be opened in order to prevent electrical power from being fed back into the upstream energy supply network.
  • Substation 2 especially the switchgear 4. This voltage drop goes up to 0 V.
  • the power flow monitor 10 » for example at least one
  • Trigger criterion of the switch 12 since the power flow described above occurs even in the event of a power failure.
  • the AC voltage distribution 14 is initially operated via the energy store 24.
  • the energy store 24 feeds electrical power into the AC voltage distribution 14 by means of the battery inverter 22 and thus operates the components 16, 20, 26, 28.
  • the generator 34 can also feed electrical power into the AC voltage distribution 14 via the network-controlled inverter 32.
  • the power of the generator 34 is greater than is required by the components 16, 20, 26, 28.
  • the energy store 24 is charged by the generator 34, so that the energy store 24 can maintain the uninterruptible power supply of the AC voltage distribution 14 for a longer time.
  • the switch 12 If there is a power failure, that is to say when the switch 12 is open, that the state of charge of the energy store 24 falls below a lower limit value, this can be evaluated as a trigger signal for the TENAB circuit 28.
  • the components of the protection technology 26 can then be separated from the AC voltage distribution 14 by the TENAB circuit 28, so that the power consumption at the AC voltage distribution 14 is reduced. This also increases the time of the uninterruptible power supply since, on the one hand, less power is drawn from the energy store 24 and, on the other hand, more of the electrical one Power that is provided by the generator 34 can be used to charge the energy store 24.
  • the states of the 'compact field connection unit 16 are the
  • the network control level enables switching states to be queried and switching operations to be carried out.
  • communications components 20 receive switching commands, which are executed via the compact field connection unit 16 in the field. This makes it possible to control the substation 2 in the event of a network restoration and thus to enable a regulated network restoration. This regulated network restoration is possible over a longer period of time thanks to the described uninterruptible power supply. A substation 2 operated in this way can also be switched after a power failure of more than 12 or 24 hours and thus contributes to a regulated network restoration.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

La présente invention concerne une installation de transformation équipée de : un transformateur ayant un branchement primaire à un réseau de distribution électrique et un branchement secondaire à un système de répartition de tensions alternatives ; un commutateur séparant le système de répartition de tensions alternatives du réseau de distribution électrique ; un branchement d'une unité de commutation technique secondaire au système de répartition de tensions alternatives ; un branchement d'un premier redresseur d'une unité de communication au système de répartition de tensions alternatives ; et un branchement d'un onduleur à batteries d'un accumulateur d'énergie au système de répartition de tensions alternatives. Un rétablissement régulé du réseau est assisté en ce que le commutateur s'ouvre en cas de chute d'une tension d'entrée en dessous d'une valeur limite basse, en ce que l'onduleur à batteries impose, en fonction de la position de commutation du commutateur, une fréquence dans le système de répartition de tensions alternatives et en ce qu'un onduleur commandé par le réseau fournit, en fonction de la fréquence imposée, une puissance électrique d'un générateur au système de répartition de tensions alternatives.
PCT/EP2019/077931 2018-11-15 2019-10-15 Installation de transformation d'un réseau de distribution électrique ainsi que procédé de fonctionnement d'une installation de transformation WO2020099055A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19789929.7A EP3881412A1 (fr) 2018-11-15 2019-10-15 Équipements utilisateur et procédés de prise en charge d'une régulation de puissance de diffusion de groupe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018128735.6 2018-11-15
DE102018128735.6A DE102018128735A1 (de) 2018-11-15 2018-11-15 Umspannanlage eines Energieversorgungsnetzes sowie ein Verfahren zum Betreiben einer Umspannanlage

Publications (1)

Publication Number Publication Date
WO2020099055A1 true WO2020099055A1 (fr) 2020-05-22

Family

ID=68289960

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/077931 WO2020099055A1 (fr) 2018-11-15 2019-10-15 Installation de transformation d'un réseau de distribution électrique ainsi que procédé de fonctionnement d'une installation de transformation

Country Status (3)

Country Link
EP (1) EP3881412A1 (fr)
DE (1) DE102018128735A1 (fr)
WO (1) WO2020099055A1 (fr)

Cited By (1)

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CN111711205A (zh) * 2020-06-24 2020-09-25 国网湖南省电力有限公司 一种基于有功就近消纳的电网自动发电控制方法、系统及介质

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020134727A1 (de) 2020-12-22 2022-06-23 Westnetz Gmbh Verfahren zur Bestimmung aktueller technischer Batterieparameter einer Stationsbatterie einer Umspannanlage
DE102022101459A1 (de) 2022-01-21 2023-07-27 Westnetz Gmbh System zur hochverfügbaren Hilfsenergieversorgung sowie dazugehöriges Verfahren

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EP3096434A1 (fr) * 2015-05-19 2016-11-23 Piller Group GmbH Fonctionnement d'un réseau à courant alternatif local à l'aide d'un groupe électrogène et d'un onduleur
EP3336998A1 (fr) * 2016-12-16 2018-06-20 innogy SE Installation auxiliaire d'alimentation, convertisseur pour une installation auxiliaire d'alimentation ainsi que procédé de fonctionnement d'une installation auxiliaire d'alimentation
EP3361593A1 (fr) * 2017-02-13 2018-08-15 RWE Supply & Trading GmbH Alimentation électrique sans interruption pour charges électriques

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DE4017755A1 (de) * 1990-03-17 1991-09-19 Meissner Manfred Dipl Ing Elektrische anlage zur unterbrechungsfreien stromversorgung eines gleichstromverbrauchers
WO2010063326A1 (fr) * 2008-12-05 2010-06-10 Areva T&D Uk Ltd Système d’alimentation de secours de sous-station électrique
AT510356A1 (de) * 2010-08-31 2012-03-15 Wien En Stromnetz Gmbh Notstromversorgungssystem zur ferngesteuerten wiederherstellung der eigenbedarfsspannung in umspannwerken nach einem stromausfall
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EP3096434A1 (fr) * 2015-05-19 2016-11-23 Piller Group GmbH Fonctionnement d'un réseau à courant alternatif local à l'aide d'un groupe électrogène et d'un onduleur
EP3336998A1 (fr) * 2016-12-16 2018-06-20 innogy SE Installation auxiliaire d'alimentation, convertisseur pour une installation auxiliaire d'alimentation ainsi que procédé de fonctionnement d'une installation auxiliaire d'alimentation
EP3361593A1 (fr) * 2017-02-13 2018-08-15 RWE Supply & Trading GmbH Alimentation électrique sans interruption pour charges électriques

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111711205A (zh) * 2020-06-24 2020-09-25 国网湖南省电力有限公司 一种基于有功就近消纳的电网自动发电控制方法、系统及介质

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Publication number Publication date
DE102018128735A1 (de) 2020-05-20
EP3881412A1 (fr) 2021-09-22

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