WO2021213854A1 - Comportement de correction améliorée de défauts de systèmes d'onduleurs couplés en réseau sur des entraînements de générateurs à vitesses de rotation variables - Google Patents

Comportement de correction améliorée de défauts de systèmes d'onduleurs couplés en réseau sur des entraînements de générateurs à vitesses de rotation variables Download PDF

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Publication number
WO2021213854A1
WO2021213854A1 PCT/EP2021/059621 EP2021059621W WO2021213854A1 WO 2021213854 A1 WO2021213854 A1 WO 2021213854A1 EP 2021059621 W EP2021059621 W EP 2021059621W WO 2021213854 A1 WO2021213854 A1 WO 2021213854A1
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WO
WIPO (PCT)
Prior art keywords
reconnection
takes place
network
time
generator
Prior art date
Application number
PCT/EP2021/059621
Other languages
German (de)
English (en)
Inventor
Detlef Haje
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2021213854A1 publication Critical patent/WO2021213854A1/fr

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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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
    • 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

Definitions

  • the invention relates to a method for reconnecting grid-connected converter systems to variable-speed generator drives after a grid fault has been cleared.
  • Grid-connected converter systems must also master these requirements, for example when connecting wind turbines that have a variable-speed generator drive.
  • control of (temporary) short circuits or network faults which is also referred to as "fault ride through” in specialist circles, is an essential design criterion.
  • the invention is based on the problem of finding a solution which has a mechanically gentle error explanation behavior of grid-connected converter systems on variable-speed generator drives.
  • the problem is solved by the features of the characterizing part of claim 1.
  • a mechanically gentle error explanation behavior is achieved by the converter reconnecting the generator train in a timed manner.
  • the torsional oscillation caused by the occurrence of the network disturbance (the point in time of which cannot be predicted and thus can be arbitrary) and the torsional oscillation can be adjusted so that the excessive torsion is limited, reduced or minimized.
  • connection time is determined as a function of a measured or computationally determined vibration state. If the voltage returns before this point in time, the connection is delayed. Time windows can also be determined in which it can be switched on again immediately when the voltage is restored.
  • the switch-on time can be determined, for example, by measuring the rotor position (angle of rotation), the torsional stresses, the tooth forces or other variables. It can also be a arithmetic determination take place. This can be based on an online simulation of the vibration condition, in which the original load condition of the machine is taken into account as well as the natural vibration behavior of the string.
  • the determination can be made directly from stored characteristic values of the strand.
  • a connection can take place, for example, within a selection from all even half-waves of a torsional oscillation of the strand. This embodiment advantageously involves little effort.
  • the torsional vibrations from separation and connection discussed above can be thought of as a system response to a jump in the torsional moment T.
  • the time course of the separation cannot be significantly influenced either, since, for example, short circuits mean an immediate collapse of the generator power.
  • the reconnection can also be stretched over time (in the form of a linearly increasing ramp, for example) in order to limit the torsional oscillation resulting therefrom.
  • a ramp duration of more than one half-wave of the torsional oscillation should be aimed for here.
  • other time courses are also suitable, such as a sinusoidal increase (quarter wave) or a sin ⁇ 2 increase.
  • a further improvement can be achieved by combining both principles. If the voltage returns within a time window suitable for immediate connection, this is also carried out. In the marginal areas or outside the time window, a time-extended connection can initially take place until the time window is fully reached, or the connection is extended over a short period of time (shorter than a half-wave of the torsional oscillation). The torsional stress on the strand can be limited by the choice of the time window and the execution of the temporal stretching. If a connection is carried out at a phase position of 360 °, the oscillation is canceled out (system temperature damping not taken into account). The amplitude of the maximum torsional alternation torque corresponds to the nominal torque T (in the time to of the mains failure).
  • the combination with a time extension allows the reconnection to begin immediately, even in the case of an unfavorable phase position. This means that the grid is fed into the grid again as early as possible (at least in part). Power is also taken from the line again as early as possible so that a start-up (which occurs when the power is disconnected from the load) can be limited.
  • FIG. 1 shows the course of the torsional moment T of the generator train over time t.
  • a network fault occurs, as a result of which the generator string executes a natural oscillation, the amplitude of which decays over time.
  • the reconnection takes place when the torsional oscillation reaches a maximum close to the torsional moment before the network disturbance, that is to say at even half-waves of the torsional oscillation.
  • FIG. 2 shows the course of the torsional oscillation of the generator train when a connection takes place within a window of +/- x ° relative to the point in time of the oscillation maximum.
  • a time window is defined by the period +/- x °. If, as shown in the example, the vibration maximum is switched on within the time window, the torque of the torsional vibration may increase. By specifying the maximum permissible amplitude of the torsional vibration, the permissible width of the time window is specified.
  • a generator G is connected via a generator train St to a drive At, which can be provided, for example, by a steam turbine or the rotor of a wind power plant.
  • the drive is provided by a steam turbine, which is supplied with working steam via a steam valve V.
  • the electrical energy generated by the generator is supplied in three phases with a voltage U G , a current intensity I G and a variable frequency f G to a converter Inv, in particular a frequency converter.
  • the inverter output side predetermined to an electrical network voltage U N N and a predetermined frequency f N, for example, 50 Hz, respectively.
  • a control unit C continuously detects voltage U G , current I G and frequency f G of the generator as well as voltage U N , current I N and frequency f N of the electrical network N.
  • the control unit sends a signal S for the precise reconnection of the converter to the Mains to the converter. In the event of a monotonically increasing reconnection, the carried power, possibly over several periods of the drive frequency f G or the network frequency f N , ramped up.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

L'invention porte sur un procédé destiné à reconnecter des systèmes d'onduleurs couplés en réseau sur des entraînements de générateurs à vitesses de rotation variables en fonction d'une correction de défaut d'une perturbation de réseau. L'onduleur (Inv) subit une reconnexion au réseau (N), ladite reconnexion étant appariée à la section de générateur (St) dans le temps de sorte que le temps de connexion est déterminé conformément à l'état vibratoire de la section de générateur (St), ledit état vibratoire étant déclenché par la perturbation de réseau à l'instant (to). Selon ce procédé, appelé passage mou, la vibration de torsion causée par la survenue de la perturbation de réseau et la vibration de torsion causée par la reconnexion sont appariées de sorte que l'accroissement de torsion est minimisé, produisant avantageusement un comportement de correction de défaut mécaniquement douce.
PCT/EP2021/059621 2020-04-23 2021-04-14 Comportement de correction améliorée de défauts de systèmes d'onduleurs couplés en réseau sur des entraînements de générateurs à vitesses de rotation variables WO2021213854A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020205132.1 2020-04-23
DE102020205132.1A DE102020205132A1 (de) 2020-04-23 2020-04-23 Verbessertes Fehlerklärungsverhalten von netzgekoppelten Umrichteranlagen an drehzahlvariablen Generatorantrieben

Publications (1)

Publication Number Publication Date
WO2021213854A1 true WO2021213854A1 (fr) 2021-10-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/059621 WO2021213854A1 (fr) 2020-04-23 2021-04-14 Comportement de correction améliorée de défauts de systèmes d'onduleurs couplés en réseau sur des entraînements de générateurs à vitesses de rotation variables

Country Status (2)

Country Link
DE (1) DE102020205132A1 (fr)
WO (1) WO2021213854A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102224A1 (de) * 2018-02-01 2019-08-01 Wobben Properties Gmbh Verfahren zum Einspeisen elektrischer Leistung in ein elektrisches Versorgungsnetz

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018102224A1 (de) * 2018-02-01 2019-08-01 Wobben Properties Gmbh Verfahren zum Einspeisen elektrischer Leistung in ein elektrisches Versorgungsnetz

Also Published As

Publication number Publication date
DE102020205132A1 (de) 2021-10-28

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