EP3815211A1 - Onduleur comprenant une source de tension continue et une unité de commande - Google Patents

Onduleur comprenant une source de tension continue et une unité de commande

Info

Publication number
EP3815211A1
EP3815211A1 EP19735534.0A EP19735534A EP3815211A1 EP 3815211 A1 EP3815211 A1 EP 3815211A1 EP 19735534 A EP19735534 A EP 19735534A EP 3815211 A1 EP3815211 A1 EP 3815211A1
Authority
EP
European Patent Office
Prior art keywords
inverter
voltage
electrical
partition
voltage source
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
EP19735534.0A
Other languages
German (de)
English (en)
Inventor
Eckard Quitmann
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.)
Wobben Properties GmbH
Original Assignee
Wobben Properties 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 Wobben Properties GmbH filed Critical Wobben Properties GmbH
Publication of EP3815211A1 publication Critical patent/EP3815211A1/fr
Pending 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/51—Photovoltaic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/52—Wind-driven generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/53—Batteries
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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
    • 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
    • H02M7/5383—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 self-oscillating arrangement
    • H02M7/53846—Control circuits
    • H02M7/538466—Control circuits for transistor type converters
    • 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
    • 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
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Definitions

  • the present invention relates to a device for feeding electrical energy and a feed unit comprising such a device, such as a wind energy plant, a charging station for electric cars or a photovoltaic system, a head-end station for high-voltage direct current transmission or a power electronic container, in particular for Connection of batteries or other storage media.
  • a device for feeding electrical energy such as a wind energy plant, a charging station for electric cars or a photovoltaic system, a head-end station for high-voltage direct current transmission or a power electronic container, in particular for Connection of batteries or other storage media.
  • electrical energy is often fed into the electrical supply network by means of electrical inverters, as is the case, for example, in the case of a wind energy installation.
  • inverters available for this have a number of disadvantages that do not yet meet the future requirements of the electrical supply network.
  • inverters are only able to provide the grid with certain grid faults to a limited extent, as is traditionally provided by synchronous generators, for example by conventional power plants.
  • the associated control unit must first recognize the network fault using measurement technology, and only then can support the network, ie with a certain time delay.
  • the inverter itself is not technically designed to provide the grid with the same support as a synchronous generator when a certain grid fault occurs, e.g. if the required power supply to the inverter is simply not sufficient to support the grid fault.
  • the infeed unit is then not suitable for supporting the electrical supply network accordingly and thus, from the point of view of the electrical supply network, it does not represent a full substitute for a synchronous generator in a conventional power plant.
  • the object of the present invention is therefore to address at least one of the above-mentioned problems, in particular to propose a solution which enables conventional power plants to be replaced as fully as possible by decentralized infeeders or infeed units such as, for example, wind energy plants.
  • decentralized infeeders or infeed units such as, for example, wind energy plants.
  • At least an alternative to previously known solutions and methods for or in inverters is to be proposed.
  • a device for feeding electrical energy into a three-phase electrical supply network having a line voltage and a line frequency and being characterized by a line voltage and a line frequency.
  • the device itself comprises at least one inverter, a DC voltage source and a control unit.
  • the device for feeding in electrical energy is part of a wind energy installation or a charging station for electric cars or a photovoltaic installation or an HVDC link, high-voltage direct current transmission (HVDC), or an infeed unit which is connected on one side to a whatever kind of energy storage is connected, and on the other hand with the electrical supply network, in order to supply the electrical supply network with power or to form the electrical supply network in the first place, i.e. to energize it or to support it in the event of network faults, for example by Active and reactive power position or around that Keep frequency and voltage of the electrical supply network within the desired limits.
  • HVDC high-voltage direct current transmission
  • the inverter of the device according to the invention which can also be an inverter module, is characterized by a nominal power and has an inverter input and an inverter output.
  • the inverter output is prepared to carry a predetermined maximum current and is also set up to be connected to the electrical supply network, for example a three-phase electrical supply network with a nominal network frequency of e.g. 50 Hz or 60 Hz.
  • the inverter output is also designed for this purpose in three phases and is connected to the electrical supply network, for example, via a transformer.
  • the inverter input is set up to be connected to an electrical DC voltage source. This in turn can be fed with power from various sources, e.g. Batteries, PV modules, fuel cells etc.
  • the inverter itself is therefore connected to a DC voltage source via the inverter input and to an AC voltage network via the inverter output.
  • the inverter is thus connected to the DC voltage source in such a way that electrical energy can be exchanged between the DC voltage source and the electrical supply network in at least one, preferably in both directions.
  • the DC voltage source of the device according to the invention is also designed as an electrical memory and is characterized by a maximum electrical power and an energy content.
  • the DC voltage source is preferably designed as an electrical battery, preferably with a plurality of modules.
  • the device according to the invention is part of a wind turbine.
  • the inverter is connected, for example, via a DC voltage intermediate circuit to a rectifier, which in turn is preferably connected to the electrical stator the generator of the wind turbine is connected.
  • the inverter is preferably designed in the so-called “back-to-back” form, an active rectifier in particular being provided and preferably the active rectifier, the intermediate circuit and the inverter being accommodated in one housing.
  • the DC voltage source is then arranged in the DC voltage intermediate circuit, for example, which is connected via the DC voltage intermediate circuit to the inverter input of the inverter in such a way that electrical energy can be exchanged between the DC voltage source and the inverter.
  • the inverter itself can thus be used in particular to extract electrical energy from the DC voltage source and to supply it to the electrical supply network in order to counter the fault.
  • the device is set up to take energy from the electrical supply network in the event of a network fault and to feed it back into the DC voltage source, in particular if this is useful for the network. It is thus proposed in particular that the device is set up to work in a 4-square mode, that is to give up and / or to emit active and / or reactive power.
  • control range of the inverter is selected as a function of an angle between the grid voltage and the inverter voltage. It is therefore also proposed that the active and / or reactive power consumption and output be set as a function of an angle between the grid voltage and the inverter voltage.
  • the device according to the invention also has a control unit which is set up to control at least the inverter, in particular the inverter output.
  • the control unit is connected for this purpose in a signal-conducting manner to the inverter and in a signal-conducting manner to the DC voltage source, in particular in order to take a predetermined electrical power from the DC voltage source and to supply it to the electrical supply network by means of the inverter.
  • the control unit is also set up to control at least the inverter so that it has at least one of the functions described below.
  • the inverter correspond is set up in such a way that it can also implement these functions, that is to say has the appropriate hardware, such as, for example, corresponding semiconductors which can also implement these functions, in particular can carry the appropriate currents.
  • the device in particular the control unit and the inverter, has several of the functions described below.
  • the inverter therefore also has at least one of the additional functions described below.
  • Function a a, in particular fast, power response to a frequency disturbance in the electrical supply network.
  • both the control unit and the inverter are set up to impress three sinusoidal voltages or currents with a fixed fundamental frequency.
  • This fixed fundamental frequency is typically the fundamental wave of the mains frequency, e.g. 50 Hz or 60 Hz.
  • the sinusoidal voltages impressed by the inverter are retained in such a way that only the disturbance of the grid voltages results in a changed vector difference between the grid voltages and the impressed voltages or currents in phase angle and amplitude.
  • This reaction takes place particularly quickly or without delay, that is to say within far less than one network period, for example within half a network period or a quarter of a network period.
  • Function a) is diametrically opposed to the function of RoCoF relays, since RoCoF relays separate the generator from the electrical supply network from a predetermined value.
  • the present invention provides for the generator, that is to say the device, to be operated continuously on the electrical supply network, in particular taking into account the corresponding network error.
  • Function b a, in particular fast, current response to a voltage disturbance in the electrical supply network.
  • a current response which acts on disturbances in the mains voltages as described under function a), without a measurement or control method having to intervene actively.
  • it is particularly a fast or undelayed reaction, ie within a Network period, for example within half a network period or a quarter network period.
  • the change in a current flow due to the vector difference between the mains voltages and the impressed voltages is limited only by the inductances on the path of the current and by any limits on the current change rate in the DC voltage source.
  • Function c a, in particular fast, current response to a network fault in which the maximum current is not exceeded.
  • the inverter has a current response that is adapted in the further course of time according to a suitable control method, in particular with the aid of measurement or control methods, in such a way that the maximum current of the inverter is never exceeded.
  • the control method is also selected so that the energy storage device of the inverter, that is to say the DC voltage source, is not completely discharged or overcharged. It is therefore proposed in particular not to limit the current response of the inverter by means of suitable components, but to select the control function on the basis of permissible loads on the inverter and the DC voltage source so that neither the inverter nor the DC voltage source are overloaded in the event of a fault in the electrical supply network.
  • the device is thus preferably set up to run through disturbances of the mains voltage in the electrical supply network without disconnection from the network and to instantaneously exchange a current with the network which is more useful to the network than in the previously conventional methods, because the method according to the invention is more similar to the behavior of a synchronous generator.
  • the intervention of the control method mentioned to limit the current response thus takes place at different speeds depending on the network error that has occurred. For example, in the event of a sharp voltage drop with a low residual amplitude of the grid voltage, the differential voltage between the impressed voltages of the inverter and the residual amplitude of the grid voltage increases very sharply.
  • Function d) a phase jump capability that allows a phase jump of the mains voltage to be passed through by at least 20 °.
  • the device in particular the inverter, is set up to continue on the electrical supply network to be operated or the device is designed so that it can continue to be operated, in particular without separating the device from the electrical supply network and feeding a grid-useful current, in particular despite a phase jump in the grid voltage.
  • the device is thus preferably set up to perform phase jumps in the mains voltage in the electrical supply network.
  • the function d) is diametrically opposed to the function of a vector step relay, since a vector step relay separates the generator from the electrical supply network from a predetermined value of the sudden change in the phase position of the mains voltage.
  • the present invention provides for the generator, that is to say the device, to be operated continuously on the electrical supply network, in particular taking into account the corresponding network error.
  • phase jump is to be understood in particular as angular jumps in the mains voltage in both directions, that is to say both in the positive and in the negative direction.
  • the device is at least set up to perform phase jumps of at least 30 °. In a particularly preferred embodiment of at least 170 °.
  • the device in particular the inverter, is set up to impress electrical voltages and / or to feed electrical currents in order to minimize harmonics of the voltages or currents found in the electrical supply network.
  • Harmonics are to be understood in particular as local phenomena which lead to the current or the voltage not having an ideal sine. Harmonics usually have a fundamental frequency that is above the nominal network frequency.
  • Function f an electrical power feed that is intended to minimize voltage asymmetries in the electrical supply network. It is therefore proposed in particular that the device, in particular the inverter, is set up to impress electrical voltages and / or feed electrical currents in order to minimize asymmetries in the voltages or currents found in the electrical supply network. A control function described below is preferably used for this.
  • Function g) feeding electrical power which is intended to dampen network vibrations, in particular power fluctuations, preferably low-frequency or subsynchronous power fluctuations, in the electrical supply network.
  • Network vibrations mean vibrations of the magnet wheels of different power plants with each other or vibrations of controls against each other, which lead to periodic changes in frequency and power flows. These are mostly large-scale, very rare phenomena with only weak damping. These vibrations can also be referred to as inter area oscillations.
  • the inverter is preferably characterized by a nominal current and is designed such that the physical load limit of the inverter is greater than or equal to 1.0 times, particularly preferably 1.5 times, the nominal current.
  • the device is oversized compared to normal operation in order to be able to drive through all network errors accordingly.
  • the device is thus designed in particular on the basis of the faults to be traversed and not on the basis of the nominal power.
  • the inverter and also or alternatively the DC voltage source and also or alternatively the control unit are set up in such a way that the device according to the invention is designed to influence the voltage.
  • a voltage-defining device for feeding electrical power into an electrical supply network is proposed. This means, in particular, that the device is set up to impress a symmetrical three-phase voltage system at its network connection point, in particular to specify it purely sinusoidally with only the desired fundamental oscillation, and preferably also to maintain it.
  • the DC voltage source is preferably dimensioned at least in such a way that the inverter can provide its nominal power for at least 0.5 seconds, preferably for at least 1 second, particularly preferably for at least 10 seconds, in particular using the DC voltage source exclusively.
  • the device is designed to be particularly useful for the network and, on the other hand, it is designed for network faults in such a way that the device can support the electrical supply network at least briefly and in particular autonomously.
  • the device it has been recognized that such a design can be carried out with a sufficiently large application of the present invention, for example by 100 wind energy plants, a grid support which is close to or equivalent to that of a conventional power plant. If the device according to the invention is used over a large area, stable network operation using only decentralized and, above all, inverter-based (renewable) energies can be implemented in a technically sensible and reliable manner.
  • the DC voltage source has at least one partition which is assigned to one of the properties a) to g).
  • the device has the functions a) and b). Then the DC voltage source has at least a first partition for the function a) with a predetermined energy content and a second partition for the function b) with a predetermined energy content.
  • the DC voltage source consists of several capacitors that are assigned to the specific functions.
  • the DC voltage source can have 5 battery modules, one of which is for the function a), one for the function b) and three more which are freely available. This ensures, in particular, that the device can carry out the functions at any time, in particular even if, in the case of a wind power installation, for example, no wind is blowing, that is to say the wind power installation itself cannot generate any electrical power.
  • the corresponding partitions are implemented using the hardware. It is particularly advantageous here that the corresponding batteries can be selected according to their corresponding function.
  • control unit be set up to reserve at least one property of the properties a) to g) a memory content of the DC voltage source.
  • the partitions that is to say the reservation of a predetermined amount of electrical energy, take place by means of the control unit, that is to say the partition is also or alternatively implemented by means of software. It is particularly advantageous here that the corresponding partitions can be changed in accordance with certain network situations while the device is in operation. For example. If a neighboring large power plant is under revision, in this case the partitions for the grid-supporting functions would be increased accordingly to compensate for this.
  • the DC voltage source preferably has at least one of the lists comprising: at least 10% of the energy content as a partition for the property a); at least 10% of the energy content as a partition for property b); at least 10% of the energy content as a partition for property c); at least 10% of the energy content as a partition for property d); at least 10% of the energy content as a partition for property e); at least 10% of the energy content as a partition for property f); at least 10% of the energy content as a partition for property g); at least 10% of the energy content as a partition for the property g).
  • the DC voltage source has at least one partition for at least one function of the inverter.
  • This partition comprises at least 10% of the energy content of the DC voltage source. At least 10% of the energy content of the DC voltage source is thus reserved for one of the functions a) to g).
  • the inverter - in addition to the conversion of the energy from the primary source (e.g. wind, solar radiation, etc.), which is always implemented as a basic function - has exactly one additional function and for this exactly one function, 10% of the energy content of the DC voltage source is reserved. Accordingly, the device can freely dispose of 90% of the energy content of the DC voltage source, for example in order to comply with setpoints specified by the network operator.
  • the reserved 10% of the DC voltage source is only used, for example, to minimize harmonics that occur in the network.
  • the device has at least two functions of functions a) to g) and the DC voltage source corresponding to at least two partitions, each comprising at least 10% of the energy content of the DC voltage source. In this case, twice 10% of the energy content, a total of 20% of the energy content, is reserved for the corresponding functions.
  • the partition for property a) is larger than the partition for property b).
  • the DC voltage source preferably has at least one, preferably at least two, of the following list, comprising: at least 50% of the energy content as a partition for the property a); at least 20% of the energy content as a partition for property b); in particular at least 10% of the energy content as a partition for the property e); at least 10% of the energy content as a partition for the property g).
  • At least half of the energy content of the DC voltage source is provided for the function a).
  • at least one partition for function b) and one partition for function g) and in particular one partition for function e) are provided. It is therefore proposed in particular to retain energy for the system-critical processes or to keep them available for these possible cases.
  • Function e) is regarded as system-critical, particularly in weak networks. If the device is used in strong networks, the device should preferably only have the functions a), b) and g) and its corresponding partitions.
  • the inverter or the control unit of the device also has the functions a), b), in particular e), and g) described above or below. It was namely recognized according to the invention that in particular a combination of these at least 4 functions can support the electrical supply network particularly well and the device according to the invention is therefore particularly well suited to be used in converter-dominated supply networks, in particular to replace conventional power plants.
  • the inverter is preferably operated using a voltage-shaping PWM method, in particular without the need to start one or more Simultaneous grid failure a) - g) as listed above, first measure the grid voltages before a current reaction begins.
  • the PWM method has voltage setpoints for this. Only in the further course of the network fault, when the intrinsic current response threatens to reach the limits of the components, or the amount of energy exchanged between the DC voltage source and the network reaches the limits of the DC voltage store, is a measurement of the network voltage necessary to determine the further behavior by means of the control unit to optimize the grid utility of the inverter.
  • the control unit further has at least one control function to control the inverter after one of the properties a) to g) has been triggered, the control function having a history of the list, comprising: an exponential history with an adjustable time constant; a linear course with an adjustable gradient; a setpoint with an adjustable period.
  • the control unit is thus set up to continuously control the inverter, the control unit actuating the inverter using a special control function after one of the functions described above or below, for example due to a network fault in the electrical supply network.
  • This control function can either be an exponential curve with an adjustable time constant, a linear curve with an adjustable gradient or a predetermined target value with an adjustable period.
  • the type of function is determined according to the type and severity of the error.
  • a look-up table can be provided in the control unit, which includes limit values, above or below which one of the control functions described above or below is selected.
  • the inverter preferably has at least the properties a) and b), the DC voltage source having at least 50% of the energy content as a partition for the property a) and at least 20% of the energy content as a partition for the property b), the control unit in each case having a control function for the properties a) and b), the control function having an exponential curve with an adjustable time constant and / or a linear curve with an adjustable gradient and / or a target value with an adjustable period.
  • the device have at least the functions a) and b) and that a predetermined energy content in the DC voltage source is reserved for at least these two functions by means of one partition each.
  • control function described above or below is also stored for each of the functions a) and b).
  • no more than 30% of the energy content of the DC voltage source is freely available to the device, in particular at least 70% of the energy content of the DC voltage source is intended for countering frequency and voltage disturbances in the electrical supply network.
  • a wind power installation comprising a device described above or below is also proposed.
  • the wind energy installation comprises, for example, a generator, at the output of which a rectifier is arranged.
  • the device according to the invention is connected to this rectifier and the electrical supply network in order to feed the electrical power generated by the generator into the electrical supply network.
  • a charging station for electric cars comprising a device described above or below.
  • the charging station is thus at least set up to use the device according to the invention to exchange electrical energy between the connected vehicles and the network (charging or discharging the vehicles) and also to support the network with network-supporting functions in the event of network errors.
  • a supply unit in particular a photovoltaic system or a head-end station of a high-voltage direct current transmission or a functional combination of a large number of power electronic modules, preferably concentrated in a container, is proposed for an electrical supply network comprising a device as described above or below.
  • the feed unit is thus prepared in particular for connecting batteries or other storage media or has them.
  • a container with power electronics which has a device described above or below, in order to, in addition to stationary operation with e.g. Reactive power exchange for voltage maintenance at its network connection point, in addition to supporting the electrical supply network with network-supporting functions in the event of network errors.
  • FIG. 1 shows a schematic view of a wind turbine according to the invention in accordance with one embodiment.
  • Fig. 2 shows a schematic structure of a device according to the invention, in particular as part of a wind turbine.
  • 1 shows a schematic view of a wind power installation 100 according to the invention.
  • the wind energy installation 100 has a tower 102 and a nacelle 104.
  • An aerodynamic rotor 106 with three rotor blades 108 and a spinner 110 is arranged on the nacelle 104.
  • the rotor 106 is rotated by the wind and thereby drives a generator in the nacelle.
  • the generator itself is connected to a rectifier, which in turn is connected to a device described above or below in order to feed electrical energy into a three-phase electrical supply network.
  • FIG. 2 shows a schematic structure of a device according to the invention, in particular for use in a wind energy installation, as is preferably shown in FIG. 1.
  • the wind energy installation 100 has a generator 120 which, in particular on the stator side, is connected in three phases to a rectifier 130.
  • the rectifier 130 generates a DC voltage Udc from the three-phase AC voltage of the generator 120.
  • This DC voltage Udc is applied to a DC voltage intermediate circuit to which the device 200 according to the invention is also connected.
  • the inverter 210 is characterized by a nominal power and further comprises an inverter input 212 and an inverter output 214.
  • the inverter input 212 is set up to be connected to the DC voltage source 220, in particular via the DC voltage intermediate circuit 140.
  • the inverter input 212 is thus also connected to the rectifier 130 via the DC voltage intermediate circuit 140.
  • the inverter output 214 is configured to carry a predetermined maximum current and to be connected to the three-phase electrical supply network 300, for example via a transformer (not shown).
  • the DC electrical voltage source 220 is designed as an electrical store and is characterized by a capacity, an electrical power and an energy content.
  • the DC voltage source 220 preferably has a plurality of battery modules or partitions.
  • the DC voltage source 220 is connected to the inverter input 212 such that electrical energy can be exchanged between the DC voltage source 220 and the inverter 210.
  • a control unit 230 is provided which is set up to control at least the inverter 210 in such a way that the inverter has at least one of the properties a) to g) described above or below.
  • the inverter has the properties: a) a fast power response to a frequency disturbance in the electrical supply network and b) a fast current response to a voltage disturbance in the electrical supply network.
  • the DC voltage source 220 comprises at least two partitions 212, 214, each of which is assigned to one of the functions a) and b).
  • control unit 230 is set up to reserve at least the properties a) and b) a memory content of the DC voltage source.
  • the partitions 212, 214 are thus implemented via software in a preferred embodiment and are managed by the control unit 230.
  • 50% of the energy content is provided as partition 212 for property a) and 20% of the energy content as further partition 214 for property b).
  • the remaining 30% can, for example, be used as a buffer for supporting the DC voltage Udc of the DC voltage intermediate circuit 140.
  • the control unit In order to release the energy content of the DC voltage source 130 for the properties of the inverter 210, for example if a frequency disturbance occurs in the electrical supply network 300, the control unit has at least one control function 232 for the corresponding properties. Which control function is selected can be stored, for example, in a look-up table 234; this is, for example, an exponential curve with an adjustable time constant in the case of a frequency disturbance or a linear curve with an adjustable gradient in the case of a voltage disturbance.
  • the inverter 210 is preferably controlled by means of a PWM method 236, which is particularly preferred Has voltage setpoints.
  • a tolerance band method is also conceivable.
  • the device 200 according to the invention is thus designed to shape the voltage, i.e. it can be operated in the transient and subtransient time range, in particular independently of the measurement of the mains voltage, and nevertheless has the functions described above or below.
  • the device 200 according to the invention is thus set up to predefine a voltage at the grid connection point of the wind energy installation and, despite external disturbances to the grid voltage, to maintain it within the scope of the possibilities of the energy store according to the invention and the possible maximum currents.
  • the device thus enables a wind turbine to be designed as a so-called network generator.
  • the wind power installation is set up on the basis of the device according to the invention to pass through a large number of network faults without disconnecting from the electrical supply network in the event of a fault and to stabilize the network by means of suitable power supply.
  • this makes it possible for wind turbines to take on grid-supporting properties that are otherwise usually only provided by rotating synchronous generators.
  • the wind power installation is also set up by the device according to the invention to perform a grid-supporting function, even when there is no wind.
  • the partition in the DC voltage source is provided. The wind power installation can thus ensure the functions described above or below, which are particularly grid-supporting, regardless of the prevailing wind.

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

Abstract

L'invention concerne un dispositif pour l'alimentation en énergie électrique dans un réseau d'alimentation électrique triphasé, le dispositif présentant une fréquence de réseau et une tension de réseau et étant caractérisé par une fréquence nominale de réseau et une tension nominale de réseau, et comprenant : un onduleur qui a au moins une propriété faisant partie de la liste suivante : a) une réponse en puissance, en particulier rapide, à une perturbation de fréquence dans le réseau d'alimentation électrique ; b) une réponse en intensité, en particulier rapide, à une perturbation de tension dans le réseau d'alimentation électrique ; c) une réponse en intensité, en particulier rapide, à une perturbation du réseau, en particulier selon a), b), d), e), f) ou g) pour laquelle l'intensité maximale n'est pas dépassée ; d) une capacité de saut de phase qui permet le passage d'un saut de phase d'au moins 20° de la tension de réseau ; e) une alimentation en tensions et/ou intensités électriques permettant de minimiser les harmoniques existantes de la tension ou des intensités dans le réseau d'alimentation électrique ; f) une alimentation en intensités électriques, en particulier en intensités asymétriques permettant de minimiser les asymétries de tension dans le réseau d'alimentation électrique ; g) une alimentation en puissance électrique permettant d'effectuer une atténuation d'oscillations de réseau, en particulier d'oscillations de puissance, de préférence d'oscillations de puissance basse fréquence ou subsynchrones, dans le réseau d'alimentation électrique.
EP19735534.0A 2018-06-29 2019-06-28 Onduleur comprenant une source de tension continue et une unité de commande Pending EP3815211A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018115794.0A DE102018115794A1 (de) 2018-06-29 2018-06-29 BOD Converter
PCT/EP2019/067438 WO2020002656A1 (fr) 2018-06-29 2019-06-28 Onduleur comprenant une source de tension continue et une unité de commande

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EP3815211A1 true EP3815211A1 (fr) 2021-05-05

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US (1) US20210273582A1 (fr)
EP (1) EP3815211A1 (fr)
CN (1) CN112368902A (fr)
DE (1) DE102018115794A1 (fr)
WO (1) WO2020002656A1 (fr)

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EP3890136A1 (fr) 2020-03-30 2021-10-06 Wobben Properties GmbH Procédé de fonctionnement d'un convertisseur, en particulier d'une éolienne

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DE102018115794A1 (de) 2020-01-02
US20210273582A1 (en) 2021-09-02
WO2020002656A1 (fr) 2020-01-02
CN112368902A (zh) 2021-02-12

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