CN113765146B - Double-fed induction fan fault ride-through system and method under direct-current commutation failure - Google Patents

Double-fed induction fan fault ride-through system and method under direct-current commutation failure Download PDF

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CN113765146B
CN113765146B CN202111316684.2A CN202111316684A CN113765146B CN 113765146 B CN113765146 B CN 113765146B CN 202111316684 A CN202111316684 A CN 202111316684A CN 113765146 B CN113765146 B CN 113765146B
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current
rotor
voltage
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fed induction
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CN113765146A (en
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郑子萱
宋东徽
杜凯健
肖先勇
谢琦
汪颖
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Sichuan University
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    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
    • H02P21/28—Stator flux based control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/102—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of transients
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2103/00—Controlling arrangements characterised by the type of generator
    • H02P2103/10—Controlling arrangements characterised by the type of generator of the asynchronous type
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a double-fed induction fan fault ride-through system and a ride-through method under direct-current commutation failure
Figure 458185DEST_PATH_IMAGE001
A transformer and a power grid. The fault ride-through system of the doubly-fed induction fan under the direct-current commutation failure limits the rotor overcurrent caused by continuous faults, limits the rotor overvoltage through the direct-current unloading circuit, designs the improved control strategy of the rotor-side converter, can absorb or send inductive reactive current, can accelerate transient magnetic flux linkage attenuation by using the rotor-side converter, and improves the low-voltage and high-voltage continuous fault ride-through capability of the doubly-fed induction fan.

Description

Double-fed induction fan fault ride-through system and method under direct-current commutation failure
Technical Field
The invention belongs to the technical field of double-fed induction fan equipment, and particularly relates to a fault ride-through system and a ride-through method of a double-fed induction fan under the condition of direct-current commutation failure.
Background
In the technical field of Doubly-fed induction wind turbine equipment, a Doubly-fed induction generator (DFIG) is still and continuously used as a main flow machine type of a wind power plant in an HVDC (high voltage direct current) transmission end alternating current system. However, when a commutation failure occurs in an inverter station of an HVDC system, a low-then-high continuous fault may be caused to a transmitting wind farm bus. Direct connection of the DFIG to the stator results in a high susceptibility of the DFIG to voltage faults. Under the background of large-scale wind power integration, the fan needs to be ensured to be capable of passing through low and high voltage continuous faults, and the stability of a power system is prevented from being seriously reduced.
Fault-ride-through studies of DFIGs by researchers have typically been conducted for low and high voltages, respectively. Only the fan strategy is optimized, and although the DFIG can cross a slight fault, the limited rated capacity of the converter of the DFIG causes that the optimized control strategy can not cross a serious fault. Therefore, the introduction of the hardware device protection DFIG is a common method, and among various methods, the series impedance circuit has the advantages of low cost and easy realization. However, if impedances are connected in series on the stator side, the terminal voltage may rise further during high voltage faults, which are low and high voltage continuous faults, jeopardizing safe operation of the DFIG stator and rotor windings and sensing equipment, etc.
Therefore, the direct current unloading resistor (DC-Chopper) is connected in parallel at the position where the impedance circuit is connected in series at the rotor side of the DFIG and the direct current bus, and corresponding improved control is provided, so that the rotor is ensured not to be over-current and the voltage of the direct current bus is not over-voltage, the attenuation of the transient process is accelerated, reactive support is provided, and the low-high voltage continuous fault ride-through capability of the DFIG is improved.
Disclosure of Invention
The invention aims to solve the problems that the existing doubly-fed induction fan fault ride-through research only considers single low-voltage fault or high-voltage fault, a low-voltage and high-voltage continuous fault protection scheme is lacked, and the existing doubly-fed induction fan reactive power control scheme cannot timely output dynamic reactive current required by fan grid-connected standard due to continuous voltage change in a short time, and provides a doubly-fed induction fan fault ride-through system and a ride-through method under direct-current commutation failure.
The technical scheme of the invention is as follows: the double-fed induction fan fault ride-through system under the condition of direct-current commutation failure comprises a double-fed induction fan, a current-limiting impedance, a first thyristor control switch, a second thyristor control switch, a rotor-side converter, a direct-current unloading circuit, a grid-side converter and an inductor
Figure 105269DEST_PATH_IMAGE001
A transformer and a power grid;
the stator side of the double-fed induction fan is connected with a power grid through a transformer, and the rotor side of the double-fed induction fan sequentially passes through a current-limiting impedance, a rotor-side converter, a direct-current unloading circuit, a grid-side converter and an inductor
Figure 182815DEST_PATH_IMAGE001
The transformer is connected with a power grid; the two ends of the first thyristor control switch are connected with the two ends of the current-limiting impedance in a one-to-one correspondence mode, and the two ends of the second thyristor control switch are connected with the two ends of the current-limiting impedance in a one-to-one correspondence mode.
The invention has the beneficial effects that: the fault ride-through system of the doubly-fed induction fan under the direct-current commutation failure limits the rotor overcurrent caused by continuous faults, limits the rotor overvoltage through the direct-current unloading circuit, designs the improved control strategy of the rotor-side converter, can absorb or send inductive reactive current, can accelerate transient magnetic flux linkage attenuation by using the rotor-side converter, and improves the low-voltage and high-voltage continuous fault ride-through capability of the doubly-fed induction fan.
Based on the system, the invention also provides a double-fed induction fan fault ride-through method under the condition of direct-current commutation failure, which comprises the following steps:
s1: when the voltage of a public connection point between the transformer and the power grid is lower than 0.9pu or more than 1.1pu, a first thyristor control switch and a second thyristor control switch are turned on, and a rotor-side converter adopts an improved control strategy and emits or absorbs reactive positive sequence current according to the voltage of the power grid;
s2: setting the reference value of the active positive sequence current and the reference value of the reactive positive sequence current of the rotor-side converter to be 0 within a preset time;
s3: and when the reference value of the active positive sequence current and the reference value of the reactive positive sequence current of the rotor-side converter are kept to be 0, the first thyristor control switch and the second thyristor control switch are closed within a preset time, and the current-limiting impedance is withdrawn, so that the doubly-fed induction fan can be recovered to operate in a normal state.
Further, in step S1, the control strategy of the rotor-side converter is specifically: transient flux linkage attenuation is accelerated by outputting demagnetizing current, a rotor current peak value is restrained by current-limiting impedance, and in the period that the voltage of a public connection point is lower than 0.9pu, a doubly-fed induction fan is controlled to improve the voltage of a power grid by outputting reactive positive sequence current, and the reference value of active positive sequence current of a rotor-side converter is reduced according to a set proportion according to stator voltage deviation; and when the voltage of the public connection point is more than 1.1pu, controlling the doubly-fed induction fan to improve the voltage of the power grid by absorbing the reactive positive sequence current, and keeping the reference value of the active positive sequence current at the moment as the reference value of the active positive sequence current before the fault.
Further, in step S1, the reference value of the reactive positive sequence current is output
Figure 714291DEST_PATH_IMAGE002
The calculation formula of (2) is as follows:
Figure 119865DEST_PATH_IMAGE003
wherein the content of the first and second substances,
Figure 762198DEST_PATH_IMAGE004
the inductance value of the stator inductance is represented,
Figure 444984DEST_PATH_IMAGE005
the inductance value of the current-limiting impedance is represented,
Figure 147360DEST_PATH_IMAGE006
the inductance value of the exciting inductor is represented,
Figure 40230DEST_PATH_IMAGE007
represents the reactive current coefficient required by grid-tie standards during low voltage faults,
Figure 486255DEST_PATH_IMAGE008
represents the reactive current coefficient required by grid-tie standards during high voltage faults,
Figure 272814DEST_PATH_IMAGE009
the terminal voltages of the stator are indicated,
Figure 146092DEST_PATH_IMAGE010
representing the absolute value of the difference between the actual voltage and the nominal voltage,
Figure 526258DEST_PATH_IMAGE011
representing the grid angular frequency;
reference value of active positive sequence current
Figure 775974DEST_PATH_IMAGE012
The calculation formula of (2) is as follows:
Figure 167772DEST_PATH_IMAGE013
wherein the content of the first and second substances,
Figure 211951DEST_PATH_IMAGE014
representing the positive sequence reference value of the active current before the fault.
Demagnetization current
Figure 79413DEST_PATH_IMAGE015
The calculation formula of (2) is as follows:
Figure 867241DEST_PATH_IMAGE016
wherein the content of the first and second substances,
Figure 628392DEST_PATH_IMAGE017
，
Figure 843473DEST_PATH_IMAGE018
，
Figure 198231DEST_PATH_IMAGE019
，
Figure 524170DEST_PATH_IMAGE020
the angular frequency of the stator is represented,
Figure 890560DEST_PATH_IMAGE021
representing the stator transient flux linkage caused by a voltage fault,
Figure 542122DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 118596DEST_PATH_IMAGE023
the resistance of the rotor is represented by,
Figure 248226DEST_PATH_IMAGE024
a resistance representing the impedance of the current limit,
Figure 983970DEST_PATH_IMAGE025
the number of the imaginary numbers is represented,
Figure 540853DEST_PATH_IMAGE026
representing the transient inductance of the rotor after the triggering of the current-limiting impedance,
Figure 604624DEST_PATH_IMAGE027
the leakage inductance coefficient is represented by the value of,
Figure 537945DEST_PATH_IMAGE028
indicating rotorThe inductance of the inductor is set to be,
Figure 878928DEST_PATH_IMAGE029
the demagnetization factor is represented by the ratio of the magnetic flux,
Figure 606712DEST_PATH_IMAGE005
the inductance representing the current limiting impedance.
Peak value of rotor current
Figure 157780DEST_PATH_IMAGE030
The calculation formula of (2) is as follows:
Figure 629212DEST_PATH_IMAGE031
wherein the content of the first and second substances,
Figure 73969DEST_PATH_IMAGE032
，
Figure 238234DEST_PATH_IMAGE033
it is shown that,
Figure 276597DEST_PATH_IMAGE034
the stator coupling coefficient is represented by the equation,
Figure 286141DEST_PATH_IMAGE009
the terminal voltages of the stator are indicated,
Figure 601716DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 671303DEST_PATH_IMAGE035
the slip ratio is represented as a function of,
Figure 196963DEST_PATH_IMAGE036
the angular frequency of the stator is represented,
Figure 10198DEST_PATH_IMAGE037
the stator coupling coefficient is represented by the equation,
Figure 429547DEST_PATH_IMAGE038
which represents the magnitude of the low voltage drop,
Figure 935614DEST_PATH_IMAGE039
which represents the magnitude of the rise in the high voltage,
Figure 682991DEST_PATH_IMAGE040
the initial value of the current before the fault is shown,
Figure 299917DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 324505DEST_PATH_IMAGE041
the power frequency period of the power grid is represented,
Figure 1474DEST_PATH_IMAGE033
represents the maximum output voltage of the rotor-side converter,
Figure 236146DEST_PATH_IMAGE042
representing the stator resistance.
The invention has the beneficial effects that: according to the fault ride-through method of the doubly-fed induction fan under the direct-current commutation failure, after the fault occurs, the current-limiting impedance is connected in series in the rotor loop, the rotor overcurrent peak value is restrained, and the rotor side transformer is matched
The current device is improved and controlled to send out inductive reactive current during low-voltage fault, absorb inductive reactive current during high-voltage fault, output demagnetizing current to accelerate transient flux linkage attenuation, and enhance the low-voltage and high-voltage continuous fault ride-through capability of the doubly-fed induction fan.
Drawings
Fig. 1 is a structural diagram of a doubly-fed induction fan fault ride-through system under the condition of direct-current commutation failure;
FIG. 2 is a flow chart of a doubly-fed induction fan fault ride-through method under the condition of direct-current commutation failure;
fig. 3 is a voltage waveform diagram of a low-high voltage continuous fault caused by a commutation failure of an inverter station of the high-voltage direct-current transmission system;
fig. 4 is a control block diagram of the rotor-side converter.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a double-fed induction fan fault ride-through system under direct-current commutation failure, which comprises a double-fed induction fan, a current-limiting impedance, a first thyristor control switch, a second thyristor control switch, a rotor-side converter, a direct-current unloading circuit, a grid-side converter, an inductor
Figure 391184DEST_PATH_IMAGE001
A transformer and a power grid;
the stator side of the double-fed induction fan is connected with a power grid through a transformer, and the rotor side of the double-fed induction fan sequentially passes through a current-limiting impedance, a rotor-side converter, a direct-current unloading circuit, a grid-side converter and an inductor
Figure 863753DEST_PATH_IMAGE001
The transformer is connected with a power grid; the two ends of the first thyristor control switch are connected with the two ends of the current-limiting impedance in a one-to-one correspondence mode, and the two ends of the second thyristor control switch are connected with the two ends of the current-limiting impedance in a one-to-one correspondence mode.
Based on the above system, the present invention further provides a method for fault ride-through of a doubly-fed induction wind turbine under direct-current commutation failure, as shown in fig. 2, including the following steps:
s1: when the voltage of a public connection point between the transformer and the power grid is lower than 0.9pu or more than 1.1pu, a first thyristor control switch and a second thyristor control switch are turned on, and a rotor-side converter adopts an improved control strategy and emits or absorbs reactive positive sequence current according to the voltage of the power grid; the reactive current is used for supporting the voltage recovery of the power grid, and the step can confirm continuous fault clearing;
s2: setting the reference value of the active positive sequence current and the reference value of the reactive positive sequence current of the rotor-side converter to be 0 within a preset time;
s3: and when the reference value of the active positive sequence current and the reference value of the reactive positive sequence current of the rotor-side converter are kept to be 0, the first thyristor control switch and the second thyristor control switch are closed within a preset time, and the current-limiting impedance is withdrawn, so that the doubly-fed induction fan can be recovered to operate in a normal state.
In the embodiment of the present invention, in step S1, the control strategy of the rotor-side converter is specifically: transient flux linkage attenuation is accelerated by outputting demagnetizing current, a rotor current peak value is restrained by current-limiting impedance, and in the period that the voltage of a public connection point is lower than 0.9pu, a doubly-fed induction fan is controlled to improve the voltage of a power grid by outputting reactive positive sequence current, and the reference value of active positive sequence current of a rotor-side converter is reduced according to a set proportion according to stator voltage deviation; and when the voltage of the public connection point is more than 1.1pu, controlling the doubly-fed induction fan to improve the voltage of the power grid by absorbing the reactive positive sequence current, and keeping the reference value of the active positive sequence current at the moment as the reference value of the active positive sequence current before the fault.
In the embodiment of the invention, in step S1, the reference value of the reactive positive sequence current is output
Figure 656433DEST_PATH_IMAGE002
The calculation formula of (2) is as follows:
Figure 581663DEST_PATH_IMAGE003
wherein the content of the first and second substances,
Figure 602709DEST_PATH_IMAGE004
the inductance value of the stator inductance is represented,
Figure 398627DEST_PATH_IMAGE005
the inductance value of the current-limiting impedance is represented,
Figure 355081DEST_PATH_IMAGE006
the inductance value of the exciting inductor is represented,
Figure 502029DEST_PATH_IMAGE007
reactive power representing grid-tie specification requirements during low voltage faultsThe current coefficient of the current is measured,
Figure 326765DEST_PATH_IMAGE008
represents the reactive current coefficient required by grid-tie standards during high voltage faults,
Figure 242769DEST_PATH_IMAGE009
the terminal voltages of the stator are indicated,
Figure 353813DEST_PATH_IMAGE010
representing the absolute value of the difference between the actual voltage and the nominal voltage,
Figure 988057DEST_PATH_IMAGE011
representing the grid angular frequency;
reference value of active positive sequence current
Figure 350905DEST_PATH_IMAGE012
The calculation formula of (2) is as follows:
Figure 386994DEST_PATH_IMAGE013
wherein the content of the first and second substances,
Figure 419672DEST_PATH_IMAGE014
representing the positive sequence reference value of the active current before the fault;
the reactive positive sequence current reference value and the active current positive sequence reference value satisfy the following formula:
Figure 541212DEST_PATH_IMAGE043
wherein the content of the first and second substances,
Figure 707751DEST_PATH_IMAGE044
representing a continuous current threshold of the rotor-side converter;
demagnetization current
Figure 332767DEST_PATH_IMAGE015
The calculation formula of (2) is as follows:
Figure 51194DEST_PATH_IMAGE016
wherein the content of the first and second substances,
Figure 394450DEST_PATH_IMAGE017
，
Figure 364680DEST_PATH_IMAGE018
，
Figure 109782DEST_PATH_IMAGE045
，
Figure 749842DEST_PATH_IMAGE020
the angular frequency of the stator is represented,
Figure 845974DEST_PATH_IMAGE021
representing the stator transient flux linkage caused by a voltage fault,
Figure 88737DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 688345DEST_PATH_IMAGE023
the resistance of the rotor is represented by,
Figure 748574DEST_PATH_IMAGE024
a resistance representing the impedance of the current limit,
Figure 332002DEST_PATH_IMAGE025
the number of the imaginary numbers is represented,
Figure 316139DEST_PATH_IMAGE026
representing the transient inductance of the rotor after the triggering of the current-limiting impedance,
Figure 98150DEST_PATH_IMAGE027
the leakage inductance coefficient is represented by the value of,
Figure 142329DEST_PATH_IMAGE028
the inductance of the rotor is represented by,
Figure 885157DEST_PATH_IMAGE029
the demagnetization factor is represented by the ratio of the magnetic flux,
Figure 672985DEST_PATH_IMAGE005
the inductance representing the current limiting impedance.
During steady-state operation, the RSC control strategy is a traditional double-ring control structure of a power outer ring and a current inner ring. Active power reference signal
Figure 309503DEST_PATH_IMAGE046
And a reactive power reference signal
Figure 524583DEST_PATH_IMAGE047
Respectively with actual values of active power of the stator
Figure 738396DEST_PATH_IMAGE048
And actual value of reactive power
Figure 329914DEST_PATH_IMAGE049
Making difference, obtaining rotor active current reference value by PI controller
Figure 820938DEST_PATH_IMAGE050
And a reactive current reference value
Figure 206920DEST_PATH_IMAGE051
. Reference and actual values of rotor current
Figure 924341DEST_PATH_IMAGE052
、
Figure 53971DEST_PATH_IMAGE053
The error between the two is input into a PI controller, and a coupling compensation term is added to obtain a rotor voltage reference value
Figure 399501DEST_PATH_IMAGE054
、
Figure 221964DEST_PATH_IMAGE055
. When a continuous fault occurs, the power outer loop is disconnected, and only the power inner loop is operated to improve the current response speed during the transient state. At this time, RSC performs the proposed current coordination control.
Peak value of rotor current
Figure 410369DEST_PATH_IMAGE030
The calculation formula of (2) is as follows:
Figure 609269DEST_PATH_IMAGE056
wherein the content of the first and second substances,
Figure 746989DEST_PATH_IMAGE032
，
Figure 802670DEST_PATH_IMAGE033
it is shown that,
Figure 291420DEST_PATH_IMAGE034
the stator coupling coefficient is represented by the equation,
Figure 700536DEST_PATH_IMAGE009
the terminal voltages of the stator are indicated,
Figure 958342DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 184924DEST_PATH_IMAGE035
the slip ratio is represented as a function of,
Figure 895391DEST_PATH_IMAGE036
the angular frequency of the stator is represented,
Figure 357465DEST_PATH_IMAGE037
the stator coupling coefficient is represented by the equation,
Figure 735357DEST_PATH_IMAGE038
which represents the magnitude of the low voltage drop,
Figure 867261DEST_PATH_IMAGE039
which represents the magnitude of the rise in the high voltage,
Figure 330603DEST_PATH_IMAGE040
the initial value of the current before the fault is shown,
Figure 81521DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 579499DEST_PATH_IMAGE041
the power frequency period of the power grid is represented,
Figure 616725DEST_PATH_IMAGE033
represents the maximum output voltage of the rotor-side converter,
Figure 832943DEST_PATH_IMAGE042
representing the stator resistance.
In the embodiment of the invention, as shown in fig. 3, a typical low-high voltage continuous fault caused by a commutation failure of an inverter station of a high-voltage direct-current power transmission system is shown. Fig. 3 (a) shows a three-phase stator voltage waveform, and fig. 3 (b) shows a stator voltage effective value.
Figure 449869DEST_PATH_IMAGE057
A time of day fault occurs, the voltage is
Figure 723724DEST_PATH_IMAGE058
Down to at all times
Figure 400693DEST_PATH_IMAGE059
Multiple nominal value, up to
Figure 635365DEST_PATH_IMAGE060
At the moment the stator voltage rises to
Figure 790403DEST_PATH_IMAGE061
Multiple nominal value, up to
Figure 935077DEST_PATH_IMAGE062
The time of day. And finally, the voltage is recovered to the value before the fault.
The improved control strategy of the rotor side provided by the invention specifically comprises the following steps:
during steady-state operation, the control strategy of the rotor-side converter is a double-ring control structure of a traditional power outer ring and a traditional current inner ring. Active power reference signal
Figure 517368DEST_PATH_IMAGE046
And a reactive power reference signal
Figure 239336DEST_PATH_IMAGE047
Respectively with actual values of active power of the stator
Figure 198065DEST_PATH_IMAGE048
And actual value of reactive power
Figure 446512DEST_PATH_IMAGE049
Making difference, obtaining rotor active current reference value by PI controller
Figure 465284DEST_PATH_IMAGE050
And a reactive current reference value
Figure 674548DEST_PATH_IMAGE051
. Reference and actual values of rotor current
Figure 171389DEST_PATH_IMAGE052
、
Figure 25075DEST_PATH_IMAGE053
The error between the two is input into a PI controller, and a coupling compensation term is added to obtain a rotor voltage reference value
Figure 214748DEST_PATH_IMAGE054
、
Figure 911309DEST_PATH_IMAGE055
. When a continuous fault occurs, the power outer loop is disconnected, and only the power inner loop is operated to improve the current response speed during the transient state. At this time, the rotor side current changes
The device performs the proposed current coordination control. Low and high voltage periods are additional when a continuous fault has been entered
The reference value of the output rotor reactive positive sequence current is
Figure 211840DEST_PATH_IMAGE003
According to the formula, the double-fed induction fan outputs inductive reactive current to improve the voltage of a power grid during a low voltage period, and absorbs the inductive reactive current to reduce the voltage of the power grid during a high voltage period. The provided strategy still considers the active output of the double-fed induction fan under slight low-voltage fault and high-voltage fault, and prevents rotor overspeed and electric power
The system stability decreases. Adopting a reactive current priority control target, and setting an active current positive sequence reference value to be reduced in an equal proportion according to stator voltage deviation because voltage reduction is not beneficial to transmitting active power to a power grid during low voltage; during high voltage, which is favorable for power delivery, the active current positive sequence reference value remains at the pre-fault value. The positive sequence reference value of the active current is
Figure 169301DEST_PATH_IMAGE013
The root mean square value of the reactive and active positive sequence current should not exceed the continuous current threshold value of RSC
Figure 795454DEST_PATH_IMAGE063
Need to satisfy
Figure 916994DEST_PATH_IMAGE064
。
Because the stator voltage continuously changes in a short time and the rotor current reference value also continuously changes, in order to realize the effect of the current coordination control strategy, a hysteresis comparator is adopted in a current loop during a fault period.
The remaining available capacity of the rotor-side converter current is used to accelerate transient flux linkage decay. As shown in fig. 4, stator voltage
Figure 817954DEST_PATH_IMAGE065
Minus stator current
Figure 380653DEST_PATH_IMAGE066
And stator resistance
Figure 912129DEST_PATH_IMAGE067
The product of (a) to obtain the stator flux linkage differential
Figure 520965DEST_PATH_IMAGE068
And then integrating to obtain the stator flux linkage
Figure 491195DEST_PATH_IMAGE069
。
Figure 236297DEST_PATH_IMAGE069
Obtaining stator flux linkage through coordinate changedqAn axial component. Due to the adoption ofdAxial voltage orientation control, stator flux linkageqAxial component
Figure 125624DEST_PATH_IMAGE069
Subtracting the steady-state component to obtain the stator flux linkageqAxial transient component
Figure 956177DEST_PATH_IMAGE070
. Stator flux linkagedAxial transient component
Figure 198940DEST_PATH_IMAGE071
Namely the stator flux linkagedAn axial component. Multiplying the two by a demagnetization coefficient to obtain rotor demagnetization currentdqAxial component
Figure 64127DEST_PATH_IMAGE072
、
Figure 875089DEST_PATH_IMAGE073
. After the current-limiting impedance is triggered, the equivalent transient impedance of the rotor changes. At this time, the demagnetization current is
Figure 192937DEST_PATH_IMAGE016
The current limiting impedance provided by the invention specifically comprises the following components: as shown in fig. 1, the current-limiting impedance is arranged on the rotor side of the doubly-fed induction wind turbine and is connected in parallel with two anti-parallel thyristor controlled switches. When the motor runs normally, the thyristor controls the switch to be closed, and the current circulation of the rotor is not influenced. When a fault is detected, the parallel switch is turned off, the current-limiting impedance is input to the rotor side, the transient impedance of the rotor is equivalently increased, the overcurrent peak value of the rotor is limited, and redundant energy is consumed. The choice of the impedance parameters should be considered according to the more severe case. In a typical low-high voltage continuous fault, the most severe case is that the transient flux linkage caused by the low-voltage fault is in the same direction as the transient flux linkage caused by the high-voltage fault. In addition, since the magnitude of the transient magnetic flux generated by the step type voltage fault is larger than that of the voltage fault having a certain change time, it can be considered that both the low voltage fault and the high voltage fault are the step type faults. In a shorter time, neglecting the decay of the transient flux linkage, a low voltage fault and a subsequent high voltage fault can be equated to a voltage fault. At this time, the series impedance is inserted into the rotor circuit. Can calculate the peak value of the rotor current to meet
Figure 239391DEST_PATH_IMAGE074
. The impedance value of the required current limiting impedance can be selected according to the above formula.
The working principle and the process of the invention are as follows: the invention provides a low-high voltage continuous fault ride-through scheme of a doubly-fed induction fan based on rotor side series impedance and improved control. The current-limiting impedance is connected in series at the rotor side of the doubly-fed induction wind turbine, and the control strategy comprises a control strategy of a rotor-side converter of the DFIG. When no voltage fault occurs, the current-limiting impedance is bypassed by the parallel thyristor control switch, and the rotor impedance is not changed. When a fault is detected, the switch of the current-limiting impedance is switched off, the current-limiting impedance is connected in series with the rotor loop, the equivalent impedance of the rotor of the double-fed induction fan is increased,
rotor fault current peaks are suppressed while RSC provides dynamic reactive support to the grid with improved control. In order to prevent overvoltage of a direct-current bus of the doubly-fed induction fan caused by overmodulation of a grid-side converter due to high voltage in a low-high voltage continuous fault process, a direct-current unloading circuit is connected in parallel with the direct-current bus, when the direct-current voltage rises to an upper limit threshold, the direct-current unloading circuit is started, and when the direct-current voltage is lower than a lower limit threshold, the direct-current unloading circuit is withdrawn. Therefore, the double-fed induction fan can pass through continuous faults.
The invention has the beneficial effects that:
(1) the fault ride-through system of the doubly-fed induction fan under the direct-current commutation failure limits the rotor overcurrent caused by continuous faults, limits the rotor overvoltage through the direct-current unloading circuit, designs the improved control strategy of the rotor-side converter, can absorb or send inductive reactive current, can accelerate transient magnetic flux linkage attenuation by using the rotor-side converter, and improves the low-voltage and high-voltage continuous fault ride-through capability of the doubly-fed induction fan.
(2) According to the fault ride-through method of the doubly-fed induction fan under the direct-current commutation failure, after the fault occurs, current-limiting impedance is connected in series in a rotor loop, the overcurrent peak value of a rotor is restrained, the rotor-side converter is matched for improved control, inductive reactive current is sent out during the low-voltage fault, the inductive reactive current is absorbed during the high-voltage fault, demagnetizing current is output, transient magnetic linkage attenuation is accelerated, and the low-voltage and high-voltage continuous fault ride-through capacity of the doubly-fed induction fan is enhanced.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.

Claims (3)

1. The method is applied to a double-fed induction fan fault ride-through system under the direct-current commutation failure, and the system comprises a double-fed induction fan, a current-limiting impedance, a first thyristor control switch, a second thyristor control switch, a rotor-side converter, a direct-current unloading circuit, a grid-side converter and an inductance inductor
Figure 559487DEST_PATH_IMAGE001
The stator side of the double-fed induction fan is connected with the power grid through a transformer; the current-limiting impedance, the first thyristor control switch and the second thyristor control switch are connected in parallel, wherein the first thyristor control switch and the second thyristor control switch are connected in parallel in a reverse direction, one parallel end of the first thyristor control switch and the second thyristor control switch is connected with the rotor side of the doubly-fed induction fan, and the other parallel end of the first thyristor control switch and the second thyristor control switch is connected with one end of the rotor-side converter; the other end of the rotor side converter is sequentially connected with a direct current unloading circuit, a network side converter and an inductor in series
Figure 558274DEST_PATH_IMAGE001
Then the power grid is connected with a power grid through a transformer; the method comprises the following steps:
s1: when the voltage of a public connection point between the transformer and the power grid is lower than 0.9pu or more than 1.1pu, a first thyristor control switch and a second thyristor control switch are turned on, and a rotor-side converter adopts an improved control strategy and emits or absorbs reactive positive sequence current according to the voltage of the power grid;
s2: setting the reference value of the active positive sequence current and the reference value of the reactive positive sequence current of the rotor-side converter to be 0 within a preset time;
s3: when the reference value of the active positive sequence current and the reference value of the reactive positive sequence current of the rotor-side converter are kept to be 0, the first thyristor control switch and the second thyristor control switch are closed within a preset time, and the current-limiting impedance is withdrawn, so that the doubly-fed induction fan can be recovered to operate in a normal state;
in step S1, the control strategy of the rotor-side converter is specifically: transient flux linkage attenuation is accelerated by outputting demagnetizing current, a rotor current peak value is restrained by current-limiting impedance, and in the period that the voltage of a public connection point is lower than 0.9pu, a doubly-fed induction fan is controlled to improve the voltage of a power grid by outputting reactive positive sequence current, and the reference value of active positive sequence current of a rotor-side converter is reduced according to a set proportion according to stator voltage deviation; and when the voltage of the public connection point is more than 1.1pu, controlling the doubly-fed induction fan to improve the voltage of the power grid by absorbing the reactive positive sequence current, and keeping the reference value of the active positive sequence current at the moment as the reference value of the active positive sequence current before the fault.
2. The method for fault ride-through of the doubly-fed induction fan under the condition of direct-current commutation failure according to claim 1, wherein in the step S1, a reference value of reactive positive sequence current is output
Figure 781488DEST_PATH_IMAGE002
The calculation formula of (2) is as follows:
Figure 549331DEST_PATH_IMAGE003
wherein the content of the first and second substances,
Figure 952194DEST_PATH_IMAGE004
the inductance value of the stator inductance is represented,
Figure 172697DEST_PATH_IMAGE005
the inductance value of the current-limiting impedance is represented,
Figure 698137DEST_PATH_IMAGE006
the inductance value of the exciting inductor is represented,
Figure 898916DEST_PATH_IMAGE007
represents the reactive current coefficient required by grid-tie standards during low voltage faults,
Figure 744119DEST_PATH_IMAGE008
represents the reactive current coefficient required by grid-tie standards during high voltage faults,
Figure 723357DEST_PATH_IMAGE009
the terminal voltages of the stator are indicated,
Figure 548094DEST_PATH_IMAGE010
representing the absolute value of the difference between the actual voltage and the nominal voltage,
Figure 284669DEST_PATH_IMAGE011
representing the grid angular frequency;
reference value of the active positive sequence current
Figure 35194DEST_PATH_IMAGE012
The calculation formula of (2) is as follows:
Figure 439412DEST_PATH_IMAGE013
wherein the content of the first and second substances,
Figure 972899DEST_PATH_IMAGE014
representing the positive sequence reference value of the active current before the fault;
the demagnetization current
Figure 118577DEST_PATH_IMAGE015
The calculation formula of (2) is as follows:
Figure 774424DEST_PATH_IMAGE016
wherein the content of the first and second substances,
Figure 961210DEST_PATH_IMAGE017
，
Figure 886004DEST_PATH_IMAGE018
，
Figure 134190DEST_PATH_IMAGE019
，
Figure 966797DEST_PATH_IMAGE020
the angular frequency of the stator is represented,
Figure 74168DEST_PATH_IMAGE021
representing the stator transient flux linkage caused by a voltage fault,
Figure 498195DEST_PATH_IMAGE022
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 538570DEST_PATH_IMAGE023
the resistance of the rotor is represented by,
Figure 10920DEST_PATH_IMAGE024
a resistance representing the impedance of the current limit,
Figure 74429DEST_PATH_IMAGE025
the number of the imaginary numbers is represented,
Figure 842490DEST_PATH_IMAGE026
representing the transient inductance of the rotor after the triggering of the current-limiting impedance,
Figure 268530DEST_PATH_IMAGE027
the leakage inductance coefficient is represented by the value of,
Figure 708520DEST_PATH_IMAGE028
the inductance of the rotor is represented by,
Figure 587221DEST_PATH_IMAGE029
the demagnetization factor is represented by the ratio of the magnetic flux,
Figure 710639DEST_PATH_IMAGE005
the inductance representing the current limiting impedance.
3. The method for fault ride-through of the doubly-fed induction wind turbine under the condition of direct-current commutation failure according to claim 1, wherein in the step S1, the peak value of the rotor current is
Figure 262624DEST_PATH_IMAGE030
The calculation formula of (2) is as follows:
Figure 867656DEST_PATH_IMAGE031
wherein the content of the first and second substances,
Figure 758952DEST_PATH_IMAGE032
，
Figure 140255DEST_PATH_IMAGE033
the stator coupling coefficient is represented by the equation,
Figure 343484DEST_PATH_IMAGE009
the terminal voltages of the stator are indicated,
Figure 244768DEST_PATH_IMAGE034
represents the transient resistance of the rotor after the triggering of the current limiting impedance,
Figure 957115DEST_PATH_IMAGE035
the slip ratio is represented as a function of,
Figure 679127DEST_PATH_IMAGE036
the angular frequency of the stator is represented,
Figure 996582DEST_PATH_IMAGE037
which represents the magnitude of the low voltage drop,
Figure 406398DEST_PATH_IMAGE038
which represents the magnitude of the rise in the high voltage,
Figure 622354DEST_PATH_IMAGE039
the initial value of the current before the fault is shown,
Figure 194062DEST_PATH_IMAGE040
the power frequency period of the power grid is represented,
Figure 569286DEST_PATH_IMAGE041
represents the maximum output voltage of the rotor-side converter,
Figure 32495DEST_PATH_IMAGE042
representing the stator resistance.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2032846A2 (en) * 2006-05-31 2009-03-11 Wisconsin Alumni Research Foundation Power conditioning architecture for a wind turbine
CN107681698A (en) * 2017-11-16 2018-02-09 宝鸡文理学院 Double-fed fan motor rotor string resistance low voltage traversing control method based on power optimization
CN109256809A (en) * 2018-11-13 2019-01-22 国网四川省电力公司电力科学研究院 Based superconductive magnetic storage energy and the double-fed blower low-voltage ride-through method for improving control
CN109474019A (en) * 2018-12-29 2019-03-15 四川大学 Double-fed induction blower fan system and its low-voltage ride-through method based on coordinated control
CN109861275A (en) * 2018-12-29 2019-06-07 四川大学 A kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy
CN111313484A (en) * 2020-02-12 2020-06-19 重庆大学 Double-fed induction wind turbine generator set continuous fault ride-through control method
CN111628523A (en) * 2020-05-21 2020-09-04 山东大学 Optimized virtual impedance control method and system for fault ride-through of doubly-fed wind turbine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102122827A (en) * 2011-01-21 2011-07-13 邵诗逸 High voltage redundant converter for doubly fed induction generator (DFIG) and low voltage ride through control methods thereof
US9537437B2 (en) * 2013-03-04 2017-01-03 General Electric Company Method and system for controlling switching frequency of a doubly-fed induction generator (DFIG)
CN105552950A (en) * 2015-12-01 2016-05-04 山西大同大学 Doubly-fed wind turbine generator hybrid fault ride-through method
CN109617125B (en) * 2019-01-02 2021-09-21 上海交通大学 Doubly-fed wind turbine generator high-low voltage ride through system and method based on stator string impedance
CN111092584B (en) * 2019-12-24 2023-04-18 天津大学 Doubly-fed wind turbine low-voltage ride through method based on stator current differential feedforward control
CN111130139B (en) * 2020-01-06 2021-06-08 上海电气集团股份有限公司 Low-high voltage cascading failure ride-through control method for double-fed wind generating set

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2032846A2 (en) * 2006-05-31 2009-03-11 Wisconsin Alumni Research Foundation Power conditioning architecture for a wind turbine
CN107681698A (en) * 2017-11-16 2018-02-09 宝鸡文理学院 Double-fed fan motor rotor string resistance low voltage traversing control method based on power optimization
CN109256809A (en) * 2018-11-13 2019-01-22 国网四川省电力公司电力科学研究院 Based superconductive magnetic storage energy and the double-fed blower low-voltage ride-through method for improving control
CN109474019A (en) * 2018-12-29 2019-03-15 四川大学 Double-fed induction blower fan system and its low-voltage ride-through method based on coordinated control
CN109861275A (en) * 2018-12-29 2019-06-07 四川大学 A kind of double-fed blower low-voltage ride-through method of based superconductive magnetic storage energy
CN111313484A (en) * 2020-02-12 2020-06-19 重庆大学 Double-fed induction wind turbine generator set continuous fault ride-through control method
CN111628523A (en) * 2020-05-21 2020-09-04 山东大学 Optimized virtual impedance control method and system for fault ride-through of doubly-fed wind turbine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
基于转子串联电阻的双馈风力发电机低电压穿越;张文娟等;《电力自动化设备》;20151231(第12期);第28-33页 *
无功补偿与去磁电流协同控制的改进DFIG高电压穿越策略;汪颖等;《水电能源科学》;20191225(第12期);第172-176页 *

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