EP4150753A1 - Onduleur photovoltaïque triphasé à fonctionnement isolé en 2 phases en cas de défaut de réseau - Google Patents

Onduleur photovoltaïque triphasé à fonctionnement isolé en 2 phases en cas de défaut de réseau

Info

Publication number
EP4150753A1
EP4150753A1 EP21725131.3A EP21725131A EP4150753A1 EP 4150753 A1 EP4150753 A1 EP 4150753A1 EP 21725131 A EP21725131 A EP 21725131A EP 4150753 A1 EP4150753 A1 EP 4150753A1
Authority
EP
European Patent Office
Prior art keywords
phase
network
inverter
conductor
bridge
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.)
Pending
Application number
EP21725131.3A
Other languages
German (de)
English (en)
Inventor
Alexander UNRU
Burkard Mueller
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.)
SMA Solar Technology AG
Original Assignee
SMA Solar Technology AG
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 SMA Solar Technology AG filed Critical SMA Solar Technology AG
Publication of EP4150753A1 publication Critical patent/EP4150753A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • 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
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin

Definitions

  • the invention relates to an inverter with three bridge arms, each with a phase output, the three phase outputs each being connectable to a phase conductor of a three-phase network.
  • the invention also relates to a method for operating such an inverter.
  • Such inverters are often used to convert direct voltage, e.g. from a photovoltaic (PV) system, into a grid-compliant alternating current for feeding into a three-phase alternating current network.
  • Energy supply networks are generally designed to be three-phase at all voltage levels, with the voltage profile on the various phases being shifted by 120 ° in relation to a voltage profile on one of the other phases.
  • a three-phase inverter is known from the publication DE 102014 104216 B3, which can be operated in a single-phase emergency mode in the event of a failure of the power supply network.
  • two of the three bridge branches are operated in such a way that a single-phase bridge current for emergency power supply, for example for a residential building, can be carried out on at least one phase conductor between these two bridge branches.
  • the third branch of the bridge remains unused.
  • a direct current intermediate circuit which is connected upstream of the bridge arms, can therefore have a relatively small capacitance of its intermediate circuit capacitors in a three-phase inverter in relation to the power transmitted by the inverter. If only single-phase alternating current is provided via two of the bridge branches, this loads the intermediate circuit capacitors significantly more, which leads to pronounced periodic voltage fluctuations at twice the network frequency, also known as “low frequency ripple”. These place a heavy load on the intermediate circuit capacitors and lead to faster aging of the capacitors.
  • two of three bridge branches of an inverter are used to convert a direct current into a single-phase alternating current and the third bridge branch is used to exchange power between the direct current source and an energy store, for example a battery store.
  • the changing load on the direct current intermediate circuit can be compensated for by periodically exchanging energy between the direct current intermediate circuit and the energy store, which leads to a voltage smoothing in the intermediate circuit.
  • An inventive inverter of the type mentioned is set up to connect the phase outputs to the respective phase conductor in normal operation of the three-phase energy distribution network and / or of a higher-level energy supply network connected to the energy distribution network.
  • the inverter is also set up to disconnect the three-phase energy distribution network from the higher-level energy supply network by means of a network separation device, to separate the first phase output from the first phase conductor using a switching unit and to connect a To connect the neutral conductor of the three-phase power distribution network, to set a neutral potential for the neutral conductor via the first bridge branch, and to control the second bridge branch and the third bridge branch after the network disconnection in such a way that voltages between the second and third phase output and the neutral conductor in each case have a different phase position to one another.
  • the bridge branches can for example a 2-level B6 or a multi-level (e.g. 3-level) NPC (Neutral Point Clamped), BSNPC (Bipolar Switch NPC), ANPC (Active NPC) or FLC (Flying Capacitor) topology .
  • NPC Neutral Point Clamped
  • BSNPC Bipolar Switch NPC
  • ANPC Active NPC
  • FLC Fluor Capacitor
  • phase outputs are connected to the respective phase conductor
  • the three-phase energy distribution network is separated from the higher-level energy supply network, the first phase output is separated from the first phase conductor and is connected to a neutral conductor of the three-phase energy distribution network that via the A neutral potential for the neutral conductor is set in the first bridge branch, and that after the mains disconnection, the second bridge branch and the third bridge branch are controlled in such a way that voltages between the second and third phase output and the neutral conductor (N) have a different phase position to one another.
  • the energy distribution network is switchably connected to the superordinate energy supply network via the network separation unit.
  • the three-phase power distribution network usually has the three phase conductors and a neutral conductor.
  • the higher-level energy supply network can also have four conductors, namely three phase conductors and one neutral conductor, in the area of the network separation unit.
  • the neutral conductor of the higher-level power supply network can be connected to a grounding conductor (PE) in the area of the network separation unit, for example on a local network transformer.
  • PE grounding conductor
  • the higher-level power supply network does not necessarily have to have four conductors throughout. For example, it can also be designed as a three-wire network in some areas, which has the three phase conductors in the relevant areas, but not the neutral conductor.
  • the case that usually occurs in the event of a fault is such that a fault occurs primarily in the higher-level energy supply network, which, due to the galvanic connection of the higher-level energy supply network with the energy distribution network, spreads into the energy distribution network via the network separation unit.
  • a disorder that is primary in that Energy supply network is present, due to the galvanic connection of the two networks due to the initially closed network separation unit also present in the energy distribution network.
  • the disturbance present in the higher-level energy supply network can be prevented from spreading to the energy distribution network.
  • the energy distribution network can continue to be operated in island mode and its local loads can continue to be supplied despite a fault in the higher-level energy supply network.
  • network separation denotes the separation of the energy distribution network from the higher-level energy supply network by means of the separation unit.
  • the three phase conductors of the energy distribution network are separated from the phase conductors of the higher-level energy supply network assigned to them.
  • the neutral conductor of the power distribution network is also separated from the neutral conductor of the power supply network assigned to it.
  • This type of separation is referred to below as "all-pole separation”.
  • an island grid can continue to be supplied with an output of up to 2/3 of the nominal output of the inverter.
  • Single-phase loads within a network installation are usually connected to the various phase conductors. Because two out of three phase conductors are operated in local island operation (emergency operation), more consumers in the island network remain operational than, for example, with the solution according to DE 10 2017 131 042 A1, in which only a single-phase island network is set up.
  • the voltage fluctuations in the intermediate circuit of the inverter are minimized and, in particular, are lower than when the voltages are in the same phase position.
  • the first bridge branch is controlled in such a way that a center potential of a voltage of a DC voltage intermediate circuit is established at the first phase output. This is an easy-to-implement way of creating the neutral potential for the neutral conductor.
  • the inverter or the method in the event of a fault in the three-phase energy distribution network and / or the associated higher-level energy supply network, to disconnect the three-phase energy distribution network on all poles from the higher-level energy supply network by means of a network disconnection device.
  • a network disconnection device With all-pole disconnection, there is also a disconnection of the neutral conductors of the energy distribution network and the higher-level energy supply network.
  • the mains disconnection device which is usually arranged externally from the inverter, is controlled accordingly by the inverter.
  • connection of the neutral conductor of the power distribution network to the local earth potential (PE) can also be made by means of a suitable switching device, which is controlled by the inverter, for example.
  • the inverter is set up to control the second and third bridge branches after the mains disconnection in such a way that a phase shift of voltages between the second and third phase output and the neutral conductor deviates from one another by 120 °.
  • a transitional mode is preferably provided in which the second and third bridge branches are controlled in such a way that, after the system is disconnected, a voltage with a phase shift of 120 ° is initially output at the second and third phase output and then the phase shift between the second and third phase output the value deviating from 120 ° is changed.
  • the transitional operation preferably only lasts for a few network periods, in particular less than 5 network periods, in order to keep the load on the intermediate circuit capacitors as low as possible.
  • a phase shift between the voltages provided between the neutral conductor and the second and third phase output is set as a function of the topology of the bridge branches.
  • the phase shift that is set after the grid is disconnected is advantageous about 180 °.
  • the exact value of the phase shift can preferably be regulated via a control loop in such a way that a magnitude of voltage ripples is minimized at twice the network frequency in a DC voltage intermediate circuit of the inverter.
  • a phase shift of at least 90 ° and less than 120 ° is set after disconnection from the grid.
  • the phase shift is preferably 90 °, since minimal voltage ripples are observed in this case.
  • the current at the first phase output increases when the phase shift is reduced from 120 ° towards 90 °.
  • a maximum current is measured at the first phase output and the phase shift is reduced to 90 ° if the maximum current is below a predetermined threshold value and increased in the direction of 120 ° if the maximum current is above or at the predetermined threshold value.
  • the best possible value of the phase shift is selected dynamically depending on the current load situation in the island network, which is still associated with an acceptable current load for the first phase output.
  • FIG. 1 shows a schematic representation of a
  • Inverter connected to a local power distribution network
  • FIG. 2 shows a flow diagram of an operating method for a
  • FIG 3 shows a schematic exemplary embodiment of an inverter in a second exemplary embodiment, connected to a local energy supply network.
  • FIG. 1 shows a schematic circuit diagram of an arrangement with an inverter 10 in an exemplary embodiment.
  • the inverter is coupled to a local energy distribution network 3, hereinafter also referred to as network 3, in a manner to be explained in more detail, which is connected to a superordinate energy distribution network via a network disconnection device 2
  • Power supply network 1 is connectable.
  • Consumers 4 shown as resistors by way of example, are connected to the local network 3.
  • the local network 3 like the superordinate energy supply network 1, is a three-phase network comprising phase conductors L1, L2 and L3 and a neutral conductor N. A phase shift between the individual phase conductors L1, L2 or L3 is 120 °. In normal operation, the local network 3 is coupled to the higher-level energy supply network 1.
  • the inverter 10 comprises an inverter bridge with three bridge branches 11, 12, 13, which are basically designed in the same way and are referred to as first, second and third bridge branches 11, 12, 13 only for the sake of differentiation.
  • Each of the bridge branches 11, 12, 13 comprises a series circuit of two semiconductor switching elements 111, 112 or 121, 122 or 131, 132 Intermediate circuit capacitor 141 is shown. It goes without saying that the intermediate circuit capacitor 141 in one implementation of the circuit shown can consist of a plurality of individual capacitors connected in parallel and / or in series.
  • connections of the DC voltage intermediate circuit 14 also form the input connections of the inverter 10, to which a DC voltage source 5 is connected here.
  • the DC voltage source 5 is exemplified by the circuit symbol of a battery.
  • it can be an interconnection of one or more rechargeable batteries and / or a photovoltaic (PV) generator, which in turn has a plurality of PV cells, arranged in a plurality of PV May include modules.
  • the PV modules can be connected in a series and / or parallel connection in order to form the PV generator.
  • the direct current source 5 is connected directly to the direct voltage intermediate circuit 14. It is also conceivable to interpose a DC voltage converter in order to keep the DC voltage intermediate circuit 14 and the direct current source 5 at different voltage levels.
  • the individual semiconductor switching elements 111, 112, 121, 122, 131 and 132 are switched from one not shown here Control unit controlled, preferably in a pulse width modulation method (PWM method) in order to convert the supplied direct current.
  • PWM method pulse width modulation method
  • IGBTs Insulated Gate Bipolar Transistors
  • bipolar transistors or MOSFETs Metal Oxide Semi-Conductor Field Effect Transistors
  • suitable current and / or voltage measured values are required at the bridge branches 11, 12, 13.
  • Current measurements can be made, for example, with the help of shunts or Hall sensors that determine a current based on a measured magnetic field.
  • Voltage measurements can be made with the help of voltage dividers. The measured current and / or voltage values are evaluated in the control unit. For the sake of clarity, it has been dispensed with in FIG. 1 to draw corresponding current and / or voltage measuring means.
  • the center taps of the bridge branches 11, 12, 13 are each led out of the inverter 10 as outputs via an output filter 113, 123, 133. These outputs represent phase outputs 114, 124 and 134 of the inverter 10.
  • the output filters 113, 123, 133 are used to smooth the output voltage or the output current, so that they have a time curve that is as sinusoidal as possible.
  • topologies can also be implemented in the inverter 10 than the so-called 2-level B6 topology shown, each with three bridge branches, each with two semiconductor switching elements and a center tap.
  • An inverter can also be used in a three or multi-level topology such as "Neutral Point Clamped” (NPC), "Bipolar Switch Neutral Point Clamped” (BSNPC), "Active Neutral Point Clamped” (ANPC) or “Flying Capacitor” (FLC ) be constructed.
  • NPC Neutral Point Clamped
  • BSNPC Bipolar Switch Neutral Point Clamped
  • ANPC Active Neutral Point Clamped
  • FLC Felying Capacitor
  • phase outputs 114, 124, 134 can be connected to the corresponding conductors L1, L2 and L3 of the network 3.
  • a special feature is the connection between the first Phase output 114 and the phase conductor L1 are also guided via a changeover switch 15, the function of which will be explained in more detail below.
  • a connection of the three phase outputs 114, 124, 134 with the three phase conductors L1, L2, L3 represents normal operation for the inverter 10, in which the power provided by the direct current source 5 is fed into the local network 3 in three phases and the consumer 4 is supplied or for feeding into the power supply network 1.
  • FIG. 2 a flowchart is used to describe an operating method according to the application, which can be carried out, for example, with the inverter 10 shown in FIG. 1 in the connection shown with the network 3. The method is explained below by way of example with reference to FIG. 1.
  • the method starts in a step S1, in which the inverter 10 feeds into the three-phase network 3 in the aforementioned normal mode in a flow or voltage-controlled manner.
  • the network disconnection device 2 is closed and a connection to the energy supply network 1 is established.
  • the switching element 15 is in a switching position in which the first phase output 114 is connected to the phase conductor L1.
  • a fault in the local network 3 or the superordinate energy supply network 1 is detected, for example by a network monitoring device not shown in FIG. 1.
  • the local network 3 is disconnected from the superordinate energy supply network 1 by opening the network disconnection device 2.
  • the separation can, but does not necessarily have to be, all-pole.
  • the inverter 10 is used as a stand-alone inverter for the network 3.
  • the switching device 15 is switched by the control device of the inverter 10 or a superordinate control device in such a way that the first phase output 114 is connected to the neutral conductor N of the network 3.
  • a connection of the neutral conductor N of the local network 3 to a local ground potential PE, for example a local ground anchor is made.
  • the first bridge branch 11 is controlled in such a way that the potential on the neutral conductor N represents a neutral potential for the consumers 4, which are connected to the phase conductors L2 and L3, whereby these consumers 4 can continue to be operated.
  • a neutral potential represents, for example, a center potential in the DC voltage intermediate circuit 14, the use of the center potential as a neutral potential presupposing a sufficiently high intermediate circuit voltage.
  • a voltage in the intermediate circuit 14 is required for this, which corresponds to twice the amplitude of the phase voltage to be provided. If such a high intermediate circuit voltage is not present in normal operation, it can be provided to increase it accordingly after the mains disconnection, which is possible if a DC voltage converter is arranged between the direct current source 5 and the DC voltage intermediate circuit 14.
  • the network 3 continues to be supplied as an island network with an output of up to 2/3 of the nominal output of the inverter 10.
  • the inverter 10 is no longer operated in a flow- or voltage-controlled manner, but rather in a voltage-setting manner, so that it functions as a network generator.
  • phase position of the phase conductors L2 and L3 that are still operated is initially adopted or retained when switching to island operation, so it has a phase difference of 120 °.
  • this phase position leads to large voltage ripples at twice the network frequency in the DC voltage intermediate circuit 14 and represents a load for the DC voltage intermediate circuit 14 that fluctuates greatly over a period of the AC voltage.
  • a next step S3 the phase shift between the phase conductors L2 and L3 with respect to the neutral conductor N is changed from 120 ° to a value at which the DC voltage intermediate circuit 14 is loaded more evenly over the network period.
  • a load that is as uniform as possible is achieved with a phase shift of 90 °.
  • the phase conductors L2 and L3, which are further supplied in the island network are operated with respect to the neutral conductor in the manner of a so-called single-phase three-wire network, also known as a "split phase" network.
  • the optimal phase shift is not exactly 180 °, but deviates from it to smaller or larger values.
  • it can be provided to determine the size of the voltage ripple at twice the network frequency in the DC voltage intermediate circuit 14 and to regulate the angle of the phase shift in a control loop so that the size of the voltage ripple is minimized.
  • the “split phase” mode is retained until it is recognized in a next step S4 that the network fault in the energy supply network 1 has been eliminated.
  • phase conductors L2 and L3 are synchronized with the corresponding phase positions in the power supply network 1 with regard to their phase position by appropriate control of the second and third bridge branches 12, 13.
  • a next step S6 the network 3 is reconnected to the power supply network 1 by switching the network disconnection device 2 on again. Furthermore, the first phase output 114 is separated from the neutral conductor N by opening the switching element 115.
  • step S7 the first phase output 114 is then synchronized to the phase position of the phase conductor L1 of the energy supply network 1.
  • step S8 the switching element 15 is then switched over again in such a way that the first phase output 114, after the switching element 115 is subsequently switched on again, with the phase conductor L1 connected is.
  • the arrangement is thus again in normal operation, which was also present in step S1.
  • FIG. 3 shows, in a manner comparable to FIG. 1, a further exemplary embodiment of an arrangement comprising an inverter 10 which is connected to a local network 3 which is coupled to an energy supply network 1 via a network isolating device 2.
  • the same reference symbols denote elements that are the same or have the same effect as in FIG. 1.
  • the arrangement in FIG. 3 differs only in the topology of the inverter 10 from the arrangement in accordance with FIG. 1, the description of which is hereby explicitly referred to.
  • 132 ‘) are formed by diodes in the example shown.
  • the DC voltage intermediate circuit 14 is constructed as a divided intermediate circuit with two intermediate circuit capacitors 141, 142 connected in series. A center tap between the two intermediate circuit capacitors 141, 142 forms the neutral potential.
  • the operating method described in connection with FIG. 2 can advantageously be carried out, in which, after the occurrence of a network fault, voltage is applied to the two phase conductors L2 and L3 by the inverter 10 with respect to the neutral conductor N, the neutral conductor N through the first Bridge branch 11 is held at a neutral potential.
  • the advantage of a 3-level inverter is that a center potential can be generated as a neutral potential simply by switching on the inner ones of the switching elements 111 and 112 of the first bridge arm 11 on the neutral conductor N.
  • the subsequent setting of a phase position of approximately 180 ° leads to lower voltage ripples at twice the network frequency and thus to a lower load on the intermediate circuit capacitor 141, 142. Due to the divided design of the intermediate circuit 14, the inverter has dynamic and stable control behavior.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un onduleur (10), comprenant - une première branche de pont (11) avec une première sortie de phase (114),- une deuxième branche de pont (12) avec une seconde sortie de phase (124),- une troisième branche de pont (13) avec une troisième sortie de phase (134), les sorties de phase (114, 124, 134) des branches de pont (11, 12, 13) pouvant chacune être connectées à un conducteur de phase (L1. L2, L3) d'un réseau triphasé de distribution d'énergie (3). L'onduleur (10) est conçu, - dans un mode de fonctionnement normal du réseau triphasé de distribution d'énergie (3) et/ou d'un réseau d'alimentation électrique de niveau supérieur (1) connecté à celui-ci, pour connecter les sorties de phase (114, 124, 134) au conducteur de phase concerné (L1, L2, L3) et, - en cas de défaillance dans le réseau triphasé de distribution d'énergie (3) et/ou dans le réseau d'alimentation électrique de niveau supérieur (1) connecté à celui-ci, pour déconnecter le réseau de distribution d'énergie triphasé (3) à partir du réseau d'alimentation électrique de niveau supérieur (1) au moyen d'un sectionneur de réseau (2), pour déconnecter la première sortie de phase (114) à partir du premier conducteur de phase (L1) au moyen d'une unité de commutation (15) et pour le connecter à un conducteur neutre (N) du réseau triphasé de distribution d'énergie (3), et pour établir un potentiel neutre pour le conducteur neutre (N) par l'intermédiaire de la première branche de pont (11). L'invention concerne également un procédé de fonctionnement d'un onduleur (10) de ce type.
EP21725131.3A 2020-05-11 2021-05-10 Onduleur photovoltaïque triphasé à fonctionnement isolé en 2 phases en cas de défaut de réseau Pending EP4150753A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020112723.5A DE102020112723B4 (de) 2020-05-11 2020-05-11 Wechselrichter mit drei Brückenzweigen und Verfahren zum Betreiben eines derartigen Wechselrichters
PCT/EP2021/062340 WO2021228769A1 (fr) 2020-05-11 2021-05-10 Onduleur photovoltaïque triphasé à fonctionnement isolé en 2 phases en cas de défaut de réseau

Publications (1)

Publication Number Publication Date
EP4150753A1 true EP4150753A1 (fr) 2023-03-22

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EP21725131.3A Pending EP4150753A1 (fr) 2020-05-11 2021-05-10 Onduleur photovoltaïque triphasé à fonctionnement isolé en 2 phases en cas de défaut de réseau

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Country Link
US (1) US20230070123A1 (fr)
EP (1) EP4150753A1 (fr)
DE (1) DE102020112723B4 (fr)
WO (1) WO2021228769A1 (fr)

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CN116455251B (zh) * 2023-06-14 2023-08-29 麦田能源股份有限公司 一种三电平变换器及其控制方法

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US9225262B2 (en) * 2012-06-29 2015-12-29 Eaton Corporation Multi-level inverter apparatus and methods using variable overcurrent response
DE102014104216B3 (de) 2014-03-26 2015-06-11 Sma Solar Technology Ag Einphasiger Notbetrieb eines dreiphasigen Wechselrichters und entsprechender Wechselrichter
CN108966685A (zh) * 2016-03-04 2018-12-07 日本电产株式会社 电力转换装置、马达驱动单元、电动助力转向装置和继电器模块
EP3252937A1 (fr) * 2016-06-03 2017-12-06 Fronius International GmbH Onduleur et procédé de fonctionnement d'un onduleur
US11081997B2 (en) * 2017-01-20 2021-08-03 Nidec Corporation Power conversion device, motor drive unit, and electric power steering device
DE102017131042A1 (de) 2017-12-21 2019-06-27 Sma Solar Technology Ag Umrichter mit mindestens einem wandlermodul mit drei brückenzweigen, verfahren zum betreiben und verwendung eines solchen umrichters
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WO2021085178A1 (fr) * 2019-11-01 2021-05-06 株式会社デンソー Dispositif de commande de machine rotative
JP2022175120A (ja) * 2021-05-12 2022-11-25 株式会社Soken 電力変換装置

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DE102020112723B4 (de) 2021-11-25
WO2021228769A1 (fr) 2021-11-18
US20230070123A1 (en) 2023-03-09

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