CN114172190A - Low-voltage fault ride-through control system of full-power wind turbine generator with energy storage function - Google Patents

Low-voltage fault ride-through control system of full-power wind turbine generator with energy storage function Download PDF

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CN114172190A
CN114172190A CN202111327055.XA CN202111327055A CN114172190A CN 114172190 A CN114172190 A CN 114172190A CN 202111327055 A CN202111327055 A CN 202111327055A CN 114172190 A CN114172190 A CN 114172190A
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side converter
voltage
grid
energy storage
converter
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CN114172190B (en
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桑顺
朱悦
黄杰杰
薛晓岑
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Nantong 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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

Abstract

The invention relates to the technical field of wind turbine generator control, in particular to a low-voltage fault ride-through control system of a full-power wind turbine generator with energy storage. The system comprises a full-power wind turbine generator controlled by a voltage source, and further comprises a fault detector, a machine side converter, an energy storage unit and a grid side converter control loop which are connected with the wind turbine generator; the network side converter control loop comprises a network side converter and a virtual resistance controller; the machine side converter, the energy storage converter and the network side converter are all connected and controlled with corresponding controllers. When the power grid fails, the problem of current overshoot of the grid-side converter of the full-power wind turbine generator controlled by the voltage source can be solved, the direct-current voltage of the wind turbine generator is kept near a rated value during the power grid failure, meanwhile, the grid-side converter can still provide output current for supporting a failed power grid, and low-voltage fault ride-through of the wind turbine generator during the power grid failure is realized without locking the grid-side converter.

Description

Low-voltage fault ride-through control system of full-power wind turbine generator with energy storage function
Technical Field
The invention relates to the technical field of wind turbine generator control, in particular to a low-voltage fault ride-through control system of a full-power wind turbine generator with energy storage.
Background
At present, an energy storage device is added at the direct current side of a full-power wind turbine generator, as shown in fig. 1, the energy storage device absorbs and releases energy, and the wind turbine generator can participate in the primary frequency modulation function of a power grid. As shown in fig. 2, a grid-side converter of a full-power wind turbine generator controlled by a voltage source dynamically realizes an autonomous synchronization function on a power grid by using a direct-current capacitor; the machine side converter still adopts a vector control method based on rotor flux orientation, and inertia transfer control is superposed on a machine side power reference value, so that the wind wheel inertia is transferred to the power grid side, and the inertia response function of the wind turbine generator participating in the power grid is realized.
However, when the grid fails, the grid-side converter of the voltage source controlled full-power wind turbine generator is prone to current overshoot and direct-current voltage overshoot, which endangers the safe and stable operation of the wind turbine generator. Although a control method is adopted, the grid-side converter blocks the grid-side trigger pulse when the grid fails, so that the overcurrent phenomenon of the grid-side converter is avoided, but the blocking of the trigger pulse makes the grid-side converter unable to provide short-circuit current for supporting the failed grid, and the recovery of the failed grid is not facilitated.
Disclosure of Invention
The invention aims to solve the problems of current overshoot and direct current voltage overshoot of a grid-side converter of a full-power wind turbine generator controlled by a voltage source when a power grid fails, and realize no-lock low-voltage fault ride-through of the wind turbine generator during the power grid failure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-voltage fault ride-through control system of a full-power wind turbine generator with stored energy comprises a full-power wind turbine generator controlled by a voltage source, and further comprises a fault detector, a machine side converter, an energy storage unit and a network side converter control loop which are connected with the wind turbine generator; the network side converter control loop comprises a network side converter and a virtual resistance controller; the machine side converter, the energy storage converter and the network side converter are connected and controlled with corresponding controllers; the network side converter adopts inertia synchronous control, namely, the autonomous synchronization of the power grid is realized according to the direct-current voltage dynamic state; the direct current side of the wind turbine generator is connected with an energy storage converter; the machine side converter adopts conventional vector control based on rotor flux linkage orientation; the input of the virtual resistance controller is the output current of the network side converter and the short-circuit fault flag bit, and the output of the virtual resistance controller is superposed on the modulation voltage of the network side converter to be used as a new modulation voltage; when a power grid has a short-circuit fault, a fault detector generates a fault flag bit, a virtual resistor is put into a control loop of a grid-side converter to suppress overcurrent of the grid-side converter, and a controller of an energy storage converter is switched to a direct-current voltage no-difference control state, so that direct-current voltage overshoot is suppressed and maintained in a reasonable range, the reference value of output power of a machine side converter is reduced to 10% of a rated value, and the direct-current voltage drop caused by excessive energy absorption of energy storage and excessively low machine side output power during the fault is avoided; and after the short-circuit fault of the power grid is cleared, the virtual resistor in the control loop of the grid-side converter is cut out, the controller of the energy storage converter is switched from a no-difference control state to a droop control state, and the output power reference value of the machine-side converter is adjusted to a rated value.
As a preferred technical scheme of the invention: in the control loop of the network side converter, the voltage per unit value of the direct current side is output as theta after passing through the integrator, and the theta and the modulation voltage amplitude UtGenerating a three-phase sinusoidal voltage utabc(ii) a In the virtual resistance controller, a virtual resistance RvAs a gating switch SEGInput at position 1, gating switch SEGThe input at position 2 is 0 and the fault Flag is used as the gating switch SEGWhen the fault Flag is 0, that is, when no short-circuit fault occurs, the switch S is gatedEGWhen the fault Flag is 1 at the position 2, namely a short-circuit fault occurs, the switch S is gatedEGIn position 1; gating switch SEGThe output of the converter is connected with the output current i of the network side converter after passing through a conversion rate limiting linkgabcMultiplying as the output of a virtual resistance controller, a three-phase sinusoidal voltage utabcAnd virtual resistance controlThe difference between the outputs of the inverters is used as the three-phase modulation voltage of the grid-side converter.
As a preferred technical scheme of the invention: in the conversion rate limiting link of the virtual resistance controller, the virtual resistance R is switched out after short-circuit fault recovery is avoidedvCaused overcurrent at RvThe change rate limiting link is in effect in the process of reducing the value to 0; increase from 0 to R in the virtual resistance valuevThe change rate limiting element does not function, i.e., the virtual resistance value is not limited to increase from 0 to RvThe purpose of (a) is to put the dummy resistor into limiting the output current over-current as soon as possible after the fault occurs.
As a preferred technical scheme of the invention: in the controller of the energy storage converter, integral control is added on the basis of a droop control outer ring of the energy storage converter, the difference between a reference per unit value of direct current voltage and an actual per unit value of the direct current voltage is used as deviation, the reference per unit value of the direct current voltage is 1, and the first path entry coefficient of the deviation is KdThe droop controller of (1); the second path-passing coefficient of the deviation is KIAfter the integrator as a gating switch SEGInput at position 1, gating switch SEGThe input of the position 2 is 0, and the delay time of the fault Flag bit Flag is TEAfter the falling edge delay device Delayer, the falling edge delay device is used as a gating switch SEGThe control signal of (2); gating switch SEGWhen the control signal of (2) is 0, the output is position 2, and when the control signal is 1, the output is position 1; gating switch SEGThe output of the energy storage converter is superposed to the output of the first channel droop controller to be used as a reference value of a current control inner loop, and the difference between the reference value and the feedback value of the current inner loop is used as a trigger pulse of the energy storage converter through a modulation link after passing through a PI regulator.
As a preferred technical scheme of the invention: minimum value R of the virtual resistancevminInfluenced by parameters such as filter inductance of the network side converter and the like, and minimum value RvminThe formula of (1) is:
Figure BDA0003347581700000021
in formula (1), UgmThe amplitude of the grid voltage; i ismThe amplitude value of the rated current of the wind turbine generator is obtained; omegagIs the angular frequency of the power grid, namely 314.159 rad/s; l isfIs the filter inductance of the network side converter.
As a preferred technical scheme of the invention: in designing the virtual resistance RvWhen R isvLess than Rvmin。
Compared with the prior art, the low-voltage fault ride-through control system of the full-power wind turbine generator with energy storage has the following technical effects by adopting the technical scheme:
when the power grid fails, the problem of current overshoot of the grid-side converter of the full-power wind turbine generator controlled by the voltage source can be solved, the direct-current voltage of the wind turbine generator is kept near a rated value during the power grid failure, meanwhile, the grid-side converter can still provide output current for supporting a failed power grid, and low-voltage fault ride-through of the wind turbine generator during the power grid failure is realized without locking the grid-side converter.
Drawings
FIG. 1 is a diagram of a prior art full power wind turbine system with stored energy;
FIG. 2 is a voltage source control block diagram of a full power wind turbine in the prior art;
FIG. 3 is a block diagram of the low voltage fault ride-through control system of the full power wind turbine generator set according to the present invention;
FIG. 4 is a block diagram of a virtual resistance controller of the grid-side converter according to the present invention;
FIG. 5 is a block diagram of the control architecture of the energy storage converter of the present invention;
fig. 6 is a low-voltage fault ride-through simulation waveform when the grid voltage drops.
Detailed Description
The present invention will be further explained with reference to the drawings so that those skilled in the art can more deeply understand the present invention and can carry out the present invention, but the present invention will be explained below by referring to examples, which are not intended to limit the present invention.
Referring to fig. 3, in an embodiment of the present invention, a structural block diagram of a low-voltage fault ride-through control system of a full-power wind turbine generator with energy storage is shown, a grid-side converter adopts inertia synchronous control, that is, autonomous synchronization of a power grid is dynamically realized according to a direct-current voltage, a direct-current side of the wind turbine generator is connected to an energy storage converter, and a machine-side converter adopts a conventional vector control method based on rotor flux orientation; in order to inhibit the overcurrent of the network side converter during the power grid fault, a virtual resistance controller is added on the basis of the inertial synchronous control of the network side converter, the input of the virtual resistance controller is the output current of the network side converter and a short-circuit fault flag bit, and the output of the virtual resistance controller is superposed on the modulation voltage of the network side converter to be used as a new modulation voltage; when a power grid has a short-circuit fault, a fault detector generates a fault flag bit, a virtual resistor is put into a control loop of a grid-side converter to suppress overcurrent of the grid-side converter, and a controller of an energy storage converter is switched to a direct-current voltage no-difference control state, so that direct-current voltage overshoot is suppressed and maintained in a reasonable range, the reference value of output power of a machine side converter is reduced to 10% of a rated value, and direct-current voltage drop caused by excessive energy absorption of energy storage and excessively low machine side output power during the fault is avoided; and after the short-circuit fault of the power grid is cleared, the virtual resistor in the control loop of the grid-side converter is cut out, the controller of the energy storage converter is switched from a no-difference control state to a droop control state, and the output power reference value of the machine-side converter is adjusted to a rated value.
Referring to fig. 4, a block diagram of a virtual resistor controller of a grid-side converter is shown. In a control loop of the network side converter, a voltage per unit value at the direct current side is output as theta after passing through an integrator, and the theta and a modulation voltage amplitude UtGenerating a three-phase sinusoidal voltage utabc(ii) a In the virtual resistance controller, a virtual resistance RvAs a gating switch SEGInput at position 1, gating switch SEGThe input at position 2 is 0 and the fault Flag is used as the gating switch SEGWhen the fault Flag is 0, that is, when no short-circuit fault occurs, the switch S is gatedEGWhen the fault Flag is 1 at the position 2, namely a short-circuit fault occurs, the switch S is gatedEGIn position 1; gating switch SEGOutput of (2)After a conversion rate limiting link, the current i is output with a network side convertergabcMultiplying as the output of a virtual resistance controller, a three-phase sinusoidal voltage utabcAnd the difference with the output of the virtual resistance controller is used as the three-phase modulation voltage of the grid-side converter.
In the conversion rate limiting link of the virtual resistance controller, the virtual resistance R is switched out after short-circuit fault recovery is avoidedvCaused overcurrent at RvThe change rate limiting link is in effect in the process of reducing the value to 0; increase from 0 to R in the virtual resistance valuevThe change rate limiting element does not function, i.e., the virtual resistance value is not limited to increase from 0 to RvThe purpose of (a) is to put the dummy resistor into limiting the output current over-current as soon as possible after the fault occurs.
Referring to fig. 5, a control structure of the energy storage converter is shown. In the controller of the energy storage converter, integral control is added on the basis of a droop control outer ring of the energy storage converter, the difference between a reference per unit value of direct current voltage and an actual per unit value of the direct current voltage is used as deviation, the reference per unit value of the direct current voltage is 1, and the first path entry coefficient of the deviation is KdThe droop controller of (1); the second path-passing coefficient of the deviation is KIAfter the integrator as a gating switch SEGInput at position 1, gating switch SEGThe input of the position 2 is 0, and the delay time of the fault Flag bit Flag is TEAfter the falling edge delay device Delayer, the falling edge delay device is used as a gating switch SEGThe control signal of (2); gating switch SEGWhen the control signal of (2) is 0, the output is position 2, and when the control signal is 1, the output is position 1; gating switch SEGThe output of the energy storage converter is superposed to the output of the first channel droop controller to be used as a reference value of a current control inner loop, and the difference between the reference value and the feedback value of the current inner loop is used as a trigger pulse of the energy storage converter through a modulation link after passing through a PI regulator.
Minimum value R of virtual resistancevminInfluenced by parameters such as filter inductance of the network side converter and the like, and minimum value RvminThe formula of (1) is:
Figure BDA0003347581700000041
in formula (1), UgmThe amplitude of the grid voltage; i ismThe amplitude value of the rated current of the wind turbine generator is obtained; omegagIs the angular frequency of the power grid, namely 314.159 rad/s; l isfIs the filter inductance of the network side converter. In designing the virtual resistance RvWhen R isvLess than Rvmin。
Referring to fig. 6, an embodiment of the present invention, a low voltage fault ride through simulation waveform when a grid voltage drops, wherein: the short-circuit ratio of the power grid is 2.5, and the filter inductance L of the grid-side converterf0.038mH, the wind turbine generator is controlled by a voltage source before the short-circuit fault occurs, and active power P is outputgThe power grid-side converter has the advantages that the power grid-side converter is 2MW, reactive power is 0, three-phase grounding faults occur when 24s occurs, the fault point grounding resistance R is 0.05 omega, and the virtual resistance Rv of the grid-side converter is 0.3. It can be seen from fig. 6 that after a short-circuit fault occurs, the amplitude of the grid voltage is reduced, the fault Flag is changed from 0 to 1, the output current of the wind turbine generator is temporarily increased and then suppressed below a rated value, the direct-current voltage is temporarily increased and then kept at the rated value, the energy storage converter absorbs power and then emits power, the power emitted by the generator side converter is reduced to 0.1p.u. from the rated value, the rotating speed of the wind wheel is increased, and the action pitch angle of the pitch control mechanism is increased. When the fault is removed in 26s, the voltage amplitude of the power grid is increased instantly, the Flag bit Flag of the fault is changed into 0, and the virtual resistor R of the grid-side convertervAnd slowly reducing the output current to 0, gradually increasing the output current of the wind turbine generator, maintaining the DC voltage at a rated value after the DC voltage fluctuates, gradually increasing the output power of the machine side converter from 0.1p.u. to the rated value, gradually absorbing the power by the energy storage converter, then changing the output power to 0, gradually recovering the rotating speed of the wind wheel, and gradually reducing the pitch angle to zero. The wind turbine generator set in fig. 6 still keeps the non-off-grid operation in the grid fault process of 2s, the output current is free of overcurrent, and the direct-current voltage is controlled to be close to the rated value.
When the power grid fails, the low-voltage fault ride-through control system of the full-power wind turbine generator with stored energy provided by the invention can solve the problem of current overshoot of the grid-side converter of the full-power wind turbine generator controlled by a voltage source, maintain the direct-current voltage of the wind turbine generator near a rated value during the power grid failure, simultaneously the grid-side converter can still provide output current for supporting a failed power grid, and the low-voltage fault ride-through of the wind turbine generator during the power grid failure is realized without locking the grid-side converter.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention, and are not intended to limit the scope of the present invention, and any person skilled in the art should understand that equivalent changes and modifications made without departing from the concept and principle of the present invention should fall within the protection scope of the present invention.

Claims (6)

1. A low-voltage fault ride-through control system of a full-power wind turbine generator with stored energy comprises a full-power wind turbine generator controlled by a voltage source, and is characterized by further comprising a fault detector, a machine side converter, an energy storage unit and a network side converter control loop which are connected with the wind turbine generator; the network side converter control loop comprises a network side converter and a virtual resistance controller; the machine side converter, the energy storage converter and the network side converter are connected and controlled with corresponding controllers; the network side converter adopts inertia synchronous control, namely, the autonomous synchronization of the power grid is realized according to the direct-current voltage dynamic state; the direct current side of the wind turbine generator is connected with an energy storage converter; the machine side converter adopts conventional vector control based on rotor flux linkage orientation; the input of the virtual resistance controller is the output current of the network side converter and the short-circuit fault flag bit, and the output of the virtual resistance controller is superposed on the modulation voltage of the network side converter to be used as a new modulation voltage; when a power grid has a short-circuit fault, a fault detector generates a fault flag bit, a virtual resistor is put into a control loop of a grid-side converter to suppress overcurrent of the grid-side converter, and a controller of an energy storage converter is switched to a direct-current voltage no-difference control state, so that direct-current voltage overshoot is suppressed and maintained in a reasonable range, the reference value of output power of a machine side converter is reduced to 10% of a rated value, and the direct-current voltage drop caused by excessive energy absorption of energy storage and excessively low machine side output power during the fault is avoided; and after the short-circuit fault of the power grid is cleared, the virtual resistor in the control loop of the grid-side converter is cut out, the controller of the energy storage converter is switched from a no-difference control state to a droop control state, and the output power reference value of the machine-side converter is adjusted to a rated value.
2. The system according to claim 1, wherein in the grid-side converter control loop, the per-unit value of the DC-side voltage is output as θ, θ and the modulation voltage amplitude U after passing through the integratortGenerating a three-phase sinusoidal voltage utabc(ii) a In the virtual resistance controller, a virtual resistance RvAs a gating switch SEGInput at position 1, gating switch SEGThe input at position 2 is 0 and the fault Flag is used as the gating switch SEGWhen the fault Flag is 0, that is, when no short-circuit fault occurs, the switch S is gatedEGWhen the fault Flag is 1 at the position 2, namely a short-circuit fault occurs, the switch S is gatedEGIn position 1; gating switch SEGThe output of the converter is connected with the output current i of the network side converter after passing through a conversion rate limiting linkgabcMultiplying as the output of a virtual resistance controller, a three-phase sinusoidal voltage utabcAnd the difference with the output of the virtual resistance controller is used as the three-phase modulation voltage of the grid-side converter.
3. The system according to claim 2, wherein the virtual resistance controller switches off the virtual resistance R in a slew rate limiting process to avoid recovery from short-circuit faultsvCaused overcurrent at RvThe change rate limiting link is in effect in the process of reducing the value to 0; increase from 0 to R in the virtual resistance valuevThe change rate limiting element does not function, i.e., the virtual resistance value is not limited to increase from 0 to RvThe purpose of (a) is to put the dummy resistor into limiting the output current over-current as soon as possible after the fault occurs.
4. The system according to claim 2, wherein the controller of the energy storage converter is configured to add integral control based on a droop control outer loop of the energy storage converter, take a difference between a reference per unit value of the dc voltage and an actual per unit value of the dc voltage as a deviation, and have a first-path-entering coefficient KdThe droop controller of (1); the second path-passing coefficient of the deviation is KIAfter the integrator as a gating switch SEGInput at position 1, gating switch SEGThe input of the position 2 is 0, and the delay time of the fault Flag bit Flag is TEAfter the falling edge delay device Delayer, the falling edge delay device is used as a gating switch SEGThe control signal of (2); gating switch SEGWhen the control signal of (2) is 0, the output is position 2, and when the control signal is 1, the output is position 1; gating switch SEGThe output of the energy storage converter is superposed to the output of the first channel droop controller to be used as a reference value of a current control inner loop, and the difference between the reference value and the feedback value of the current inner loop is used as a trigger pulse of the energy storage converter through a modulation link after passing through a PI regulator.
5. The system as claimed in claim 2, wherein the minimum value R of the virtual resistor is the minimum value of the virtual resistorvminInfluenced by parameters such as filter inductance of the network side converter and the like, and minimum value RvminThe formula of (1) is:
Figure FDA0003347581690000021
in formula (1), UgmThe amplitude of the grid voltage; i ismThe amplitude value of the rated current of the wind turbine generator is obtained; omegagIs the angular frequency of the power grid, namely 314.159 rad/s; l isfIs the filter inductance of the network side converter.
6. The method of claim 5The low-voltage fault ride-through control system of the full-power wind turbine generator with energy storage is characterized in that a virtual resistor R is designedvWhen R isvLess than Rvmin。
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