CN106300415A - A kind of low-voltage ride-through method of brushless dual-feedback wind power generator group combination - Google Patents

A kind of low-voltage ride-through method of brushless dual-feedback wind power generator group combination Download PDF

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CN106300415A
CN106300415A CN201610752730.6A CN201610752730A CN106300415A CN 106300415 A CN106300415 A CN 106300415A CN 201610752730 A CN201610752730 A CN 201610752730A CN 106300415 A CN106300415 A CN 106300415A
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voltage
amplitude
current
bus
winding
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CN106300415B (en
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胡胜
黄云辉
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Wuhan University of Technology WUT
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/386Wind energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention discloses the low-voltage ride-through method of a kind of brushless dual-feedback wind power generator group combination, comprise the following steps: S1, line voltage is detected in real time and calculates amplitude, amplitude is compared with set-point, if amplitude is less than set-point, show that electrical network occurs in that fault, line voltage occur in that and falls;If S2 line voltage occurs in that fall, then by the control strategy of electromotor from normal controlling tactic switch to low voltage crossing control strategy;S3, in real time detection brushless double feed generator control winding current and DC bus-bar voltage;S4, by pusher side current transformer to electrical network injecting reactive current control line voltage recovery;Line voltage is detected by S5, continuation in real time;If S6 voltage and current all meets the requirements, by controlling tactic switch to normal control strategy.The method of the present invention can strengthen the low voltage ride-through capability of brushless double feed generator group greatly.

Description

A kind of low-voltage ride-through method of brushless dual-feedback wind power generator group combination
Technical field
The present invention relates to wind-driven generator Intelligent Measurement field, particularly relate to a kind of brushless dual-feedback wind power generator group combination Low-voltage ride-through method.
Background technology
In the Wind turbines being incorporated into the power networks at present, brush Double-feed wind power unit is had to account in the Wind turbines of more than 1WM According to leading position, but the shortcoming in terms of having brush double-fed wind power generator (DFIG) to there is three below: have in (1) structure Brush, slip ring, reduce system reliability low.(2) gear-box volume is big, adds system cost.(3) grid disturbances Adapt to poor ability.And brushless dual-feedback wind power generator (BDFG) both can overcome and improve the upper of brush double-fed wind power generator State not, have again identical with there being brush double-fed wind power generator be capable of variable speed constant frequency, power decoupled controls and current transformer Capacity is little is only the advantages such as slip capacity.Therefore brushless dual-feedback wind power generator has extraordinary application prospect, and following pole has May substitute and have brush double-fed wind power generator, produce huge benefit.
Brushless dual-feed motor can be divided into mouse-cage type, magnetic resistance type and Wound-rotor type three kinds according to the difference of rotor structure.Wherein New wound-rotor type brushless dual-feed motor the harmonics of magnetic force content is low, and output voltage is the most sinusoidal, and performance has greater advantages.Due to nothing The power winding of brush double-fed generator and electrical network are joined directly together, and falling of the line voltage that therefore electric network fault causes directly acts on In brushless double feed generator, converter overvoltage can be caused to cross the significantly vibration of stream, speed fling lifting, electromagnetic torque and power, therefore, When grid voltage sags, if not taking suitable control and protective measure, brushless dual-feedback wind power generator group can be caused The electrically and mechanically damage of parts.When wind farm grid-connected capacity is less, in order to protect Wind turbines, when grid disturbances band The harmful effect come beyond when allowing limit value of brushless double feed Wind turbines, unit can off-grid at once, do not interfere with electric power The stable operation of system.But being as the development of China's large-scale wind power, wind-powered electricity generation proportion is increasing, it has also become China Three big main force power supplys, therefore the stable operation of power system can be caused serious harmful effect by the off-grid of a large amount of Wind turbines, For power system inherently safe and stable needs, power system proposes low voltage crossing to the Wind turbines being incorporated into the power networks Requirement.Therefore, brushless dual-feedback wind power generator low-voltage ride-through method under the conditions of electric network fault is to realize its grid-connected fortune The critical problem that row must solve.Have a lot currently for the low-voltage ride-through method having brush double-fed generator, but by Electromagnetic relationship in brushless dual-feedback wind power generator is complicated, model order high, low currently for brushless dual-feedback wind power generator Voltage ride-through method almost blank, therefore research brushless dual-feedback wind power generator group low-voltage ride-through method is the most urgent.
Summary of the invention
The technical problem to be solved in the present invention is for the low electricity lacking brushless dual-feedback wind power generator in prior art The defect of pressure traversing method, it is provided that the low-voltage ride-through method of a kind of brushless dual-feedback wind power generator group combination.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention provides the low-voltage ride-through method that a kind of brushless dual-feedback wind power generator group combines, and comprises the following steps:
S1, grid voltage amplitude and fall depth calculation: line voltage is detected in real time, and calculates its width in real time Value, compares the amplitude of the line voltage calculated with the set-point of grid voltage amplitude, if grid voltage amplitude is big In or given equal to grid voltage amplitude, then show that line voltage is normal, wound brushless double-fed wind power generator is according to just Normal control strategy runs;
If grid voltage amplitude giving less than grid voltage amplitude, then show that electrical network occurs in that fault, line voltage Occur in that and fall, calculate the grid voltage sags degree of depth simultaneously;
If S2 line voltage occurs in that fall, then by the control strategy of electromotor from normal controlling tactic switch to low Voltage ride-through control strategy;
S3, in real time detection brushless double feed generator control winding current and DC bus-bar voltage, if controlling winding current Amplitude less than corresponding threshold value, and DC bus-bar voltage triggers less than corresponding threshold value, the central processing unit controlling pusher side current transformer The accumulator of crow bar protection circuit and current transformer dc bus side that brushless double feed generator controls the series connection of winding side turns off, and Perform step S4;Otherwise return step S2;
S4, reactive-current compensation: fall the degree of depth according to line voltage, calculate the reactive current that should inject to electrical network Size, and as controlling the order of winding current fourth finger, control electrical network electricity by pusher side current transformer to electrical network injecting reactive current The recovery of pressure;
S5, line voltage is detected in real time, and calculate its amplitude in real time, the amplitude of line voltage that will calculate Compare with the set-point of grid voltage amplitude, if grid voltage amplitude giving less than grid voltage amplitude, then show Electric network fault disappears not yet, then perform step S4;
If grid voltage amplitude giving more than or equal to grid voltage amplitude, then show that electric network fault has disappeared, Voltage recovers normal, then perform step S2 and step S3;
S6, in real time detection brushless double feed generator control winding current and DC bus-bar voltage, if controlling winding current Amplitude less than corresponding threshold value, and DC bus-bar voltage triggers less than corresponding threshold value, the central processing unit controlling pusher side current transformer The accumulator of crow bar protection circuit and current transformer dc bus side that brushless double feed generator controls the series connection of winding side turns off, and By the low voltage crossing controlling tactic switch of wound brushless double-fed generator to normal control strategy.
Further, the low voltage crossing control strategy in step S2 of the present invention particularly as follows:
Pusher side current transformer voltage instruction value is set to zero, controls pusher side current transformer central processing unit simultaneously and trigger brushless double feed The crow bar protection circuit of generator control winding side series connection and the accumulator conducting of current transformer dc bus side, thus to pusher side Current transformer overcurrent and dc bus overvoltage suppress.
Further, in step S3 of the present invention, detection brushless double feed generator controls winding current and dc bus in real time The method of voltage particularly as follows:
By control the amplitude of winding current with control 2 times of winding rated current compare and by DC bus-bar voltage with 1.15 times of DC bus-bar voltage rated value compare, if it is specified more than or equal to controlling winding to control winding current amplitude 2 times of electric current or DC bus-bar voltage more than 1.15 times of DC bus-bar voltage rated value, then return step S2;
It is less than direct current less than control winding rated current 2 times and DC bus-bar voltage if controlling winding current amplitude 1.15 times of busbar voltage rated value, then the central processing unit controlling pusher side current transformer triggers brushless double feed generator control winding The crow bar protection circuit of side series connection and the accumulator of current transformer dc bus side turn off, and perform step S4.
Further, in step S1 of the present invention, the amplitude of line voltage compares with the set-point of grid voltage amplitude Method particularly as follows:
The amplitude of the line voltage calculated is compared with the set-point of grid voltage amplitude, if line voltage width Value more than or equal to 563 × (1-10%) V, then shows that line voltage is normal, and wound brushless double-fed wind power generator is according to just Normal control strategy runs;If grid voltage amplitude is less than 563 × (1-10%) V, then show that electrical network occurs in that fault, electrical network Voltage occurs in that and falls, and calculates the grid voltage sags degree of depth simultaneously.
Further, the computing formula of the grid voltage sags degree of depth of the present invention is:
D = U A - t e s t U A - r e f
Wherein, D is the grid voltage sags degree of depth, 0.1≤D≤0.9;UA-testActual value for grid voltage amplitude;UA-ref Set-point for grid voltage amplitude.
Further, the computing formula of the reactive current injected in step S4 of the present invention is:
Ireactive=2 × (D-0.1) × IN
Wherein, IreactiveFor the reactive current injected to electrical network;D is the grid voltage sags degree of depth, 0.1≤D≤0.9;IN For wind power generating set rated current.
The beneficial effect comprise that: the low voltage crossing side of the brushless dual-feedback wind power generator group combination of the present invention Method, the degree of depth according to grid voltage sags during fault, help electrical network electricity by electromotor to electrical network injecting reactive current The recovery of pressure, improves the Wound-rotor type brushless dual-feedback wind power generator enabling capabilities to line voltage between age at failure;Use and control Pusher side unsteady flow under the conditions of crow bar protection circuit, the accumulator of current transformer dc bus side and the electric network fault of winding side series connection Three aspects of device coordinate control to realize low voltage crossing, realize fault traversing with the simple extra hardware circuit that increases Scheme is compared, and control method is the most flexible, convenient, and during low voltage crossing, pusher side current transformer is working always, does not has Have out of control.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the method flow diagram of the embodiment of the present invention;
Fig. 2 is hardware connection figure of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not For limiting the present invention.
As it is shown in figure 1, the low-voltage ride-through method of the brushless dual-feedback wind power generator group combination of the embodiment of the present invention, including Following steps:
S1, grid voltage amplitude and fall depth calculation: line voltage is detected in real time, and calculates its width in real time Value, compares the amplitude of the line voltage calculated with the set-point of grid voltage amplitude, if grid voltage amplitude is big In or given equal to grid voltage amplitude, then show that line voltage is normal, wound brushless double-fed wind power generator is according to just Normal control strategy runs;
If grid voltage amplitude giving less than grid voltage amplitude, then show that electrical network occurs in that fault, line voltage Occur in that and fall, calculate the grid voltage sags degree of depth simultaneously;
If S2 line voltage occurs in that fall, then by the control strategy of electromotor from normal controlling tactic switch to low Voltage ride-through control strategy;
S3, in real time detection brushless double feed generator control winding current and DC bus-bar voltage, if controlling winding current Amplitude less than corresponding threshold value, and DC bus-bar voltage triggers less than corresponding threshold value, the central processing unit controlling pusher side current transformer The accumulator of crow bar protection circuit and current transformer dc bus side that brushless double feed generator controls the series connection of winding side turns off, and Perform step S4;Otherwise return step S2;
S4, reactive-current compensation: fall the degree of depth according to line voltage, calculate the reactive current that should inject to electrical network Size, and as controlling the order of winding current fourth finger, control electrical network electricity by pusher side current transformer to electrical network injecting reactive current The recovery of pressure;
S5, line voltage is detected in real time, and calculate its amplitude in real time, the amplitude of line voltage that will calculate Compare with the set-point of grid voltage amplitude, if grid voltage amplitude giving less than grid voltage amplitude, then show Electric network fault disappears not yet, then perform step S4;
If grid voltage amplitude giving more than or equal to grid voltage amplitude, then show that electric network fault has disappeared, Voltage recovers normal, then perform step S2 and step S3;
S6, in real time detection brushless double feed generator control winding current and DC bus-bar voltage, if controlling winding current Amplitude less than corresponding threshold value, and DC bus-bar voltage triggers less than corresponding threshold value, the central processing unit controlling pusher side current transformer The accumulator of crow bar protection circuit and current transformer dc bus side that brushless double feed generator controls the series connection of winding side turns off, and By the low voltage crossing controlling tactic switch of wound brushless double-fed generator to normal control strategy.
Low voltage crossing control strategy in step S2 particularly as follows:
Pusher side current transformer voltage instruction value is set to zero, controls pusher side current transformer central processing unit simultaneously and trigger brushless double feed The crow bar protection circuit of generator control winding side series connection and the accumulator conducting of current transformer dc bus side, thus to pusher side Current transformer overcurrent and dc bus overvoltage suppress.
In step S3 in real time detection brushless double feed generator control winding current and DC bus-bar voltage method particularly as follows:
By control the amplitude of winding current with control 2 times of winding rated current compare and by DC bus-bar voltage with 1.15 times of DC bus-bar voltage rated value compare, if it is specified more than or equal to controlling winding to control winding current amplitude 2 times of electric current or DC bus-bar voltage more than 1.15 times of DC bus-bar voltage rated value, then return step S2;
It is less than direct current less than control winding rated current 2 times and DC bus-bar voltage if controlling winding current amplitude 1.15 times of busbar voltage rated value, then the central processing unit controlling pusher side current transformer triggers brushless double feed generator control winding The crow bar protection circuit of side series connection and the accumulator of current transformer dc bus side turn off, and perform step S4.
As in figure 2 it is shown, the control circuit in method includes controlling the crow bar protection circuit of winding side series connection, current transformer direct current Pusher side current transformer under the conditions of the accumulator of bus bar side and electric network fault.
In another specific embodiment of the present invention, the method comprises the following steps:
Step 1, detects in real time to line voltage, and calculates its amplitude in real time, by the line voltage that calculates Amplitude compares with the set-point of grid voltage amplitude, if grid voltage amplitude is more than or equal to 563 × (1-10%) V, Then showing that line voltage is normal, wound brushless double-fed wind power generator runs according to normal control strategy, if electrical network is electric Pressure amplitude value is less than 563 × (1-10%) V, then show that electrical network occurs in that fault, line voltage occur in that and falls, calculate electricity simultaneously The net Voltage Drop degree of depth;
Its computing formula is as follows:
D = U A - t e s t U A - r e f
In formula: the D----grid voltage sags degree of depth, 0.1≤D≤0.9;
UA-test---the actual value of-grid voltage amplitude, V;
UA-ref---the set-point of-grid voltage amplitude, V.
Step 2, falls if line voltage occurs in that, then by the control strategy of electromotor from normal controlling tactic switch to Low voltage crossing control strategy: pusher side current transformer voltage instruction value is set to zero, pusher side current transformer central processing unit controls simultaneously The accumulator triggering crow bar protection circuit and current transformer dc bus side that brushless double feed generator controls the series connection of winding side is led Logical, thus pusher side current transformer overcurrent and dc bus overvoltage are suppressed.
Step 3, detection brushless double feed generator controls winding current and DC bus-bar voltage in real time, will control winding current Amplitude compare and by DC bus-bar voltage and DC bus-bar voltage rated value with controlling 2 times of winding rated current 1.15 times compare, if it is female more than or equal to control winding rated current 2 times or direct current to control winding current amplitude Line voltage more than 1.15 times of DC bus-bar voltage rated value, then repeats step 2, if controlling winding current amplitude less than controlling 2 times of winding rated current and DC bus-bar voltage less than 1.15 times of DC bus-bar voltage rated value, then control pusher side and become The central processing unit of stream device triggers brushless double feed generator and controls crow bar protection circuit and the current transformer direct current mother of the series connection of winding side The accumulator of line side turns off.
Step 4, falls the degree of depth according to the line voltage calculated in step 1, calculates the nothing injected to electrical network The size of merit electric current, and as controlling the order of winding current fourth finger, helped to electrical network injecting reactive current by pusher side current transformer Help the recovery of line voltage.
The computing formula of the reactive current injected is:
Ireactive=2 × (D-0.1) × IN
Wherein, IreactiveFor the reactive current injected to electrical network, A;D is the grid voltage sags degree of depth, 0.1≤D≤0.9; INFor wind power generating set rated current, A.
Step 5, detects in real time to line voltage, and calculates its amplitude in real time, by the line voltage that calculates Amplitude compares with the set-point of grid voltage amplitude, if grid voltage amplitude giving less than grid voltage amplitude, then Show that electric network fault disappears not yet, then repeat step 4;If grid voltage amplitude is given more than or equal to grid voltage amplitude Fixed, then show that electric network fault has disappeared, voltage recovers normal, then repeat step 2, step 3.
Step 6, detection brushless double feed generator controls winding current and DC bus-bar voltage in real time, if controlling winding electricity Stream amplitude is less than the 1.15 of DC bus-bar voltage rated value less than 2 times and DC bus-bar voltage controlling winding rated current Times, then control pusher side current transformer central processing unit trigger brushless double feed generator control winding side series connection crow bar protection circuit and The accumulator of current transformer dc bus side turns off, then by the low voltage crossing control strategy of wound brushless double-fed generator It is switched to normal control strategy.
Present invention achieves the not off-grid of new wound-rotor type brushless dual-feedback wind power generator under the conditions of electric network fault to run, carry Go out a kind of brushless dual-feedback wind power generator group combination low-voltage ride-through method, can under grid voltage sags and recovery situation, By to brushless double feed generator control winding side series connection crow bar protection circuit, current transformer dc bus side accumulator with And under the conditions of electric network fault, three aspects of pusher side current transformer coordinate control, to current transformer overcurrent and dc bus overvoltage Suppress, thus realize the protection to current transformer, and pusher side current transformer can be passed through to electricity according to the degree of depth of grid voltage sags Net injecting reactive current helps the recovery of line voltage.
Present invention have the advantage that
1. the present invention use control winding side series connection crow bar protection circuit, current transformer dc bus side accumulator with And under the conditions of electric network fault, three aspects of pusher side current transformer coordinate control, greatly enhance wound brushless double-fed generator The fault ride-through capacity of system;
2. present invention degree of depth according to grid voltage sags during fault, by electromotor to electrical network injecting reactive current Help the recovery of line voltage, improve the Wound-rotor type brushless dual-feedback wind power generator support energy to line voltage between age at failure Power;
3. the present invention use control winding side series connection crow bar protection circuit, current transformer dc bus side accumulator with And three aspects of pusher side current transformer coordinate control to realize low voltage crossing under the conditions of electric network fault, extra increase with simple Hardware circuit realizes the scheme of fault traversing and compares, and control mode is the most flexible, convenient, and in low voltage crossing process In, pusher side current transformer is working always, the most out of control.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted, And all these modifications and variations all should belong to the protection domain of claims of the present invention.

Claims (6)

1. the low-voltage ride-through method of a brushless dual-feedback wind power generator group combination, it is characterised in that comprise the following steps:
S1, grid voltage amplitude and fall depth calculation: line voltage is detected in real time, and calculates its amplitude in real time, The amplitude of the line voltage calculated is compared with the set-point of grid voltage amplitude, if grid voltage amplitude more than or Giving equal to grid voltage amplitude, then show that line voltage is normal, and wound brushless double-fed wind power generator is according to normally Control strategy runs;
If grid voltage amplitude giving less than grid voltage amplitude, then showing that electrical network occurs in that fault, line voltage occurs Fall, calculate the grid voltage sags degree of depth simultaneously;
If S2 line voltage occurs in that fall, then by the control strategy of electromotor from normal controlling tactic switch to low-voltage Pass through control strategy;
S3, in real time detection brushless double feed generator control winding current and DC bus-bar voltage, if controlling the width of winding current Value is less than corresponding threshold value, and DC bus-bar voltage is less than corresponding threshold value, and the central processing unit controlling pusher side current transformer triggers brushless The accumulator of crow bar protection circuit and current transformer dc bus side that double-fed generator controls the series connection of winding side turns off, and performs Step S4;Otherwise return step S2;
S4, reactive-current compensation: fall the degree of depth according to line voltage, calculate the big of the reactive current that should inject to electrical network Little, and as controlling the order of winding current fourth finger, control line voltage by pusher side current transformer to electrical network injecting reactive current Recovery;
S5, line voltage is detected in real time, and calculate its amplitude in real time, by the amplitude of line voltage calculated and electricity The set-point of net voltage magnitude compares, if grid voltage amplitude giving less than grid voltage amplitude, then shows electrical network Fault disappears not yet, then perform step S4;
If grid voltage amplitude giving more than or equal to grid voltage amplitude, then show that electric network fault has disappeared, voltage Recover normal, then perform step S2 and step S3;
S6, in real time detection brushless double feed generator control winding current and DC bus-bar voltage, if controlling the width of winding current Value is less than corresponding threshold value, and DC bus-bar voltage is less than corresponding threshold value, and the central processing unit controlling pusher side current transformer triggers brushless The accumulator of crow bar protection circuit and current transformer dc bus side that double-fed generator controls the series connection of winding side turns off, and will be around The low voltage crossing controlling tactic switch of wire type brushless double feed generator is to normal control strategy.
The low-voltage ride-through method of brushless dual-feedback wind power generator group the most according to claim 1 combination, it is characterised in that Low voltage crossing control strategy in step S2 particularly as follows:
Pusher side current transformer voltage instruction value is set to zero, controls pusher side current transformer central processing unit simultaneously and trigger brushless double feed generating Machine controls the crow bar protection circuit of winding side series connection and the accumulator conducting of current transformer dc bus side, thus to pusher side unsteady flow Device overcurrent and dc bus overvoltage suppress.
The low-voltage ride-through method of brushless dual-feedback wind power generator group the most according to claim 1 combination, it is characterised in that In step S3 in real time detection brushless double feed generator control winding current and DC bus-bar voltage method particularly as follows:
The amplitude controlling winding current is compared and by DC bus-bar voltage and direct current with 2 times that control winding rated current 1.15 times of busbar voltage rated value compare, if controlling winding current amplitude more than or equal to controlling winding rated current 2 times or DC bus-bar voltage more than 1.15 times of DC bus-bar voltage rated value, then return step S2;
It is less than dc bus less than control winding rated current 2 times and DC bus-bar voltage if controlling winding current amplitude 1.15 times of voltage rating, then the central processing unit controlling pusher side current transformer triggers brushless double feed generator control winding side string The crow bar protection circuit of connection and the accumulator of current transformer dc bus side turn off, and perform step S4.
The low-voltage ride-through method of brushless dual-feedback wind power generator group the most according to claim 1 combination, it is characterised in that Method that in step S1, the amplitude of line voltage and the set-point of grid voltage amplitude compare particularly as follows:
The amplitude of the line voltage calculated is compared with the set-point of grid voltage amplitude, if grid voltage amplitude is big In or equal to 563 × (1-10%) V, then show that line voltage is normal, wound brushless double-fed wind power generator is according to normally Control strategy runs;If grid voltage amplitude is less than 563 × (1-10%) V, then show that electrical network occurs in that fault, line voltage Occur in that and fall, calculate the grid voltage sags degree of depth simultaneously.
The low-voltage ride-through method of brushless dual-feedback wind power generator group the most according to claim 1 combination, it is characterised in that The computing formula of the grid voltage sags degree of depth is:
D = U A - t e s t U A - r e f
Wherein, D is the grid voltage sags degree of depth, 0.1≤D≤0.9;UA-testActual value for grid voltage amplitude;UA-refFor electricity The set-point of net voltage magnitude.
The low-voltage ride-through method of brushless dual-feedback wind power generator group the most according to claim 1 combination, it is characterised in that The computing formula of the reactive current injected in step S4 is:
Ireactive=2 × (D-0.1) × IN
Wherein, IreactiveFor the reactive current injected to electrical network;D is the grid voltage sags degree of depth, 0.1≤D≤0.9;INFor wind Power generator group rated current.
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Publication number Priority date Publication date Assignee Title
CN111682587A (en) * 2020-06-22 2020-09-18 山东大学 Wind driven generator low voltage ride through control method and system
CN111682587B (en) * 2020-06-22 2021-08-27 山东大学 Wind driven generator low voltage ride through control method and system

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