CN109066792A - The control device of double-fed wind power generator group based on nine switch converters - Google Patents
The control device of double-fed wind power generator group based on nine switch converters Download PDFInfo
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- H02J3/386—
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- 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]
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- 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
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- 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
- Y02E40/20—Active power filtering [APF]
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Abstract
The invention discloses a kind of control devices of double-fed wind power generator group based on nine switch converters, comprising: first voltage sensor is mounted on the first current output terminal, senses Active Power Filter-APF offset voltage value；Second voltage sensor is mounted on the second current output terminal, senses dynamic electric voltage recovery device offset voltage value；DC capacitor voltage value of feedback is calculated according to Active Power Filter-APF offset voltage value and dynamic electric voltage recovery device offset voltage value in arithmetic unit；PID controller obtains the active component of the Active Power Filter-APF compensation current reference value of the first current output terminal of nine switch converters according to DC capacitor voltage value of feedback and direct voltage reference value.Can in high efficiency and low cost the DC voltage of double-fed wind generator be controlled by implementing the present invention, on the basis of realizing the DC-side Voltage Stabilization of double-fed wind generator, guarantee that nine switch converters normally realize Active Power Filter-APF compensation and dynamic electric voltage recovery device compensation function.
Description
Technical field
The present invention relates to wind-driven generator field, in particular to a kind of doubly-fed wind turbine based on nine switch converters
The control device of group.
Background technique
Doubly fed induction generator (Doubly-Fed Induction Generator, DFIG) is more than as occupation rate of market
50% grid connected wind power mainstream model, Traditional control strategy carry out analysis and design mainly for ideal grid conditions, and real
Border power grid is often accompanied with voltage failure or current harmonics, and the power quality problem in power grid can be such that DFIG Wind turbines occur
The problems such as transient state overcurrent, torque pulsation, harmonic current, DC side transient state over-voltage, it is therefore desirable to be set by non-ideal grid conditions
The operation and control of wind power system are counted, is pressed down with meeting modern wind power technology to the fault traversing performance and harmonic wave of actual electric network environment
Performance processed.Research, which can administer voltage distortion and the equipment of current harmonics, has being incorporated into the power networks for double-fed fan motor unit with control
Significance.
Traditional grid type DFIG LVRT Capability of Wind Turbine Generator (LowVoltage Ride Through, LVRT) is most
It is realized using Crowbar protection circuit, in recent years, is widely used in the Research on Unified Power Quality Conditioner (Unified of electric system
Power Quality Conditioner, UPQC) because having both voltage compensation and current compensation ability, capacity configuration flexibly, dynamically
The advantages that superior performance, in wind-electricity integration field for administering voltage distortion, current harmonics and realizing that LVRT has theory can
Row.Document concentrates on and utilizes series compensation module dynamic electric voltage recovery device (Dynamic Voltage in UPQC mostly at present
Restorer, DVR) reduce set end voltage fluctuation and distortion.
Nine switch converters (Nine Switch Converter, NSC) are applied to improve distribution network electric energy quality more, with
Being realized using back-to-back double PWM converters of 12 switches inhibits current distortion compared with offset voltage distorting scheme, passes through switch
Repeated use of device mode reduces 3 full-controlled switch devices, realizes the substitution of circuit topological structure, and simplifying structure has NSC
Small in size, the advantages of switching loss is low, driving simplifies with protection, power density is high, cost is relatively low.
Wind-powered electricity generation has become the research hotspot of modern wind power technology to the adaptability of true power grid environment.NSC is used herein
Power grid adaptability of the double-fed wind power system under non-ideal grid conditions is promoted, emulation and experimental result show that mentioned NSC can
Network voltage it is symmetrical/all kinds of operating conditions such as unbalanced fault under, realize DFIG utility power quality control and fault traversing operation one
Change function.It is as shown in Figure 1 based on NSC and DFIG wind power system.Double-fed wind power generator group based on nine switch converters includes:
Sequentially connected wind energy conversion system, gear-box, double-fed generator, rotor-exciting frequency converter and nine switch converters, nine switch change-overs
The three-phase voltage transmission line of the first current output terminal parallel connection access double-fed generator of device, the second electric current of nine switch converters are defeated
Outlet accesses the net side main line of double-fed wind power generator group connecting with grid-connected tie point by transformer series.It is utilized
NSC realizes UPQC function, the current demand for improving power quality applied to DFIG wind power system, promoting fault traversing.NSC is being leaned on
Nearly grid side realizes DVR function, can maintain fan end voltage stabilization by series connection access dynamic electric voltage recovery device；Close to electricity
Pusher side parallel connection accesses current compensation unit, realizes APF function, the harmonic current that compensating non-linear load generates.
For how to guarantee that nine switch converters normally realize Active Power Filter-APF compensation and dynamic in above-mentioned Fig. 1
Voltage restorer compensation function is a urgent problem to be solved.
Summary of the invention
In view of this, the present invention is intended to provide a kind of control of double-fed wind power generator group based on nine switch converters fills
It sets, it is active on the basis of realizing the DC-side Voltage Stabilization of double-fed wind generator, to guarantee that nine switch converters are normally realized
Electric-power filter compensation and dynamic electric voltage recovery device compensation function.
Specifically, the present invention provides a kind of control device of double-fed wind power generator group based on nine switch converters,
The double-fed wind power generator group based on nine switch converters includes: sequentially connected wind energy conversion system, gear-box, doubly-fed generation
First current output terminal parallel connection of machine, rotor-exciting frequency converter and nine switch converters, nine switch converters accesses institute
The three-phase voltage transmission line of double-fed generator is stated, the second current output terminal of nine switch converters is connect by transformer series
Enter the net side main line of the double-fed wind power generator group connecting with grid-connected tie point, nine switch change-over includes in parallel
The first branch, second branch and third branch, the first branch include the first switch device being sequentially connected in series, second switch device
Part and third switching device；The second branch includes the 4th switching device being sequentially connected in series, the 5th switching device and the 6th opens
Close device；The third branch includes the 7th switching device, the 8th switching device and the 9th switching device being sequentially connected in series, described
Nine switch converters further include the DC capacitor with the first branch, second branch and third branch circuit parallel connection；The control dress
Setting includes: first voltage sensor, first current output terminal is mounted on, for sensing Active Power Filter-APF offset voltage
Value；Second voltage sensor is mounted on second current output terminal, for sensing dynamic electric voltage recovery device offset voltage value；
Arithmetic unit is connect with the first voltage sensor and second voltage sensor, compensates electricity according to the Active Power Filter-APF
Pressure value and dynamic electric voltage recovery device offset voltage value, are calculated DC capacitor voltage value of feedback；PID controller, and it is described
Arithmetic unit connection obtains the of nine switch converters according to the DC capacitor voltage value of feedback and direct voltage reference value
The active component of the Active Power Filter-APF compensation current reference value of one current output terminal, to obtain corresponding nine switch
The Active Power Filter-APF compensation current of first current output terminal of converter.
Further, the arithmetic unit includes；Adder connects with the first voltage sensor and second voltage sensor
It connects, the voltage of inductance two sides in Active Power Filter-APF is calculated according to the Active Power Filter-APF offset voltage value, and
DC voltage value is calculated plus the dynamic electric voltage recovery device offset voltage value in the voltage of the inductance two sides；Subtraction
The initial value of capacitance voltage is subtracted the DC voltage value and obtains the DC capacitor voltage value of feedback by device.
Further, the first current output terminal of nine switch converters includes first lead-out terminal, second output terminal
Son and third output terminal；The first end of the first lead-out terminal connect the second switch device and third switching device it
Between branch；The first end of second output terminal connects the branch between the 5th switching device and the 6th switching device
Road；The first end of the third output terminal connects the branch between the 8th switching device and the 9th switching device；It is described
The second end of the second end of first lead-out terminal, the second end of second output terminal and the third output terminal is distinguished
Connect the three-phase voltage transmission line of double-fed generator；
Second current output terminal of nine switch converters includes the first current terminal, the second current terminal and third electricity
Flow terminal；The first end of first current terminal connects the branch between the first switch device and second switch device；
The first end of second current terminal connects the branch between the 4th switching device and the 5th switching device；The third
The first end of current terminal connects the branch between the 7th switching device and the 8th switching device；First current terminal
Second end, the second end of the second end of second current terminal and the third current terminal is separately connected and grid-connected company
The net side main line of contact connection.
Further, nine switch converters further include the discharging circuit in parallel with the DC capacitor.
Further, the first switch device, second switch device, third switching device, the 4th switching device, the 5th
Switching device, the 6th switching device, the 7th switching device, the 8th switching device and the 9th switching device are IGBT device.
The control device of double-fed wind power generator group based on nine switch converters of the invention, by utilizing first voltage
Sensor senses Active Power Filter-APF offset voltage value；And it is compensated using second voltage sensor sensing dynamic electric voltage recovery device
Voltage value；And then by arithmetic unit according to the Active Power Filter-APF offset voltage value and dynamic electric voltage recovery device offset voltage
Value, is calculated DC capacitor voltage value of feedback；Further by PID controller according to the DC capacitor voltage value of feedback and straight
Stream voltage reference value obtains the Active Power Filter-APF compensation current reference of the first current output terminal of nine switch converters
The active component of value is mended to obtain the Active Power Filter-APF of the first current output terminal of corresponding nine switch converters
Current value is repaid, first voltage sensor is only set from hardware cost and second voltage sensor is used to acquire information,
From control, efficiently the DC voltage of double-fed wind generator can be controlled by arithmetic unit and PID controller, in reality
On the basis of the DC-side Voltage Stabilization of existing double-fed wind generator, guarantee that nine switch converters normally realize Active Power Filter-APF
Compensation and dynamic electric voltage recovery device compensation function.
Detailed description of the invention
It is incorporated into specification and the attached drawing for constituting part of specification shows the embodiment of the present invention, and with
Principle for explaining the present invention together is described.In the drawings, similar appended drawing reference is for indicating similar element.Under
Attached drawing in the description of face is some embodiments of the present invention, rather than whole embodiments.Those of ordinary skill in the art are come
It says, without creative efforts, other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is that the present invention is based on the topology diagrams of the double-fed wind power generator group of nine switch converters；
Fig. 2 is the one phase equivalent computing circuit figure of dynamic electric voltage recovery device provided in an embodiment of the present invention；
Fig. 3 a is the one phase equivalent computing circuit figure of current compensation unit provided in an embodiment of the present invention；
Fig. 3 b is the DC side equivalent operation circuit diagram of current compensation unit provided in an embodiment of the present invention；
Fig. 4 is the whole control knot of the double-fed wind power generator group provided in an embodiment of the present invention based on nine switch converters
The schematic diagram of structure；
Fig. 5 is the control device of the double-fed wind power generator group provided in an embodiment of the present invention based on nine switch converters
Structural schematic diagram；
Fig. 6 is that the modulation of nine switches UPQC provided in an embodiment of the present invention involves carrier waveform figure.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.It needs
Illustrate, in the absence of conflict, the features in the embodiments and the embodiments of the present application can mutual any combination.
The invention will now be described in detail with reference to the accompanying drawings implements the wind power generating set high voltage crossing control method being related to, dress
It sets and system.
The mathematical model of NSC is explained first.NSC mainly includes the dynamic electric voltage of series compensating voltage distortion
The Active Power Filter-APF (APF) of restorer (DVR) and shunt compensation harmonic current.Ignore power grid internal impedance and becomes injection
For lateral circuit conversion of depressor to secondary side, the one phase equivalent computing circuit of dynamic electric voltage recovery device is as shown in Figure 2.Wherein u
Cell side output voltage is mended for converter voltage；ulfFor filter inductance voltage, ilfFor its electric current, ucFor the voltage of filter capacitor,
icFor its electric current, upccFor grid entry point voltage (equivalent fault generation point), ugFor the end DFIG voltage, igFor its electric current, uDVRFor DVR
The offset voltage of injection, when injection transformer no-load voltage ratio be 1 when and ucIt is equal.
It can be obtained according to equivalent circuit:
When detecting that PCC point voltage is distorted, by-pass switch is disconnected, and DVR puts into operation, series connection injecting compensating electricity
Pressure, working principle can be represented by the formula:
Ug,abc=UPCC,abc+UDVR,abc (2)
By DVR to power grid inverse injection offset voltage, it can be ensured that eliminate voltage distortion and maintain the perseverance of the end DFIG voltage
Fixed, being able to achieve improves quality of voltage and DFIG wind power system fault traversing operation dual function.
The one phase equivalent computing circuit and DC side equivalent operation circuit of current compensation unit are as shown in figs. 3 a and 3b.Wherein
U' is current compensation unit output voltage；ugFor DFIG set end voltage, ipccPower network current, R are flowed into for points of common connectionsAnd LsFor
Resistance and reactance of the dynamic electric voltage recovery device conversion to injection transformer primary side, iDVRDynamic electric voltage is flowed to for DC side to restore
The electric current of device, iAPFThe equivalent current of current compensation unit, u are flowed to for DC sidedcFor DC voltage, idcFor its electric current.Electricity
It is as follows to flow compensating unit mathematical model:
Have in the DC side of converter:
When detecting that there is the harmonic current of nonlinear-load in the side DFIG, APF puts into operation, injecting compensating electric current in parallel,
Its working principle can be represented by the formula:
Ig,abc=IPCC,abc+IAPF,abc (5)
Electric current is compensated to power grid inverse injection by APF, is able to achieve and inhibits DFIG wind-electricity integration mission nonlinear load humorous
The function of wave electric current.
It is shown in Figure 4, a kind of double-fed wind power generator group based on nine switch converters provided in an embodiment of the present invention
Whole control structure schematic diagram, voltage compensation DVR model (unit) uses two close cycles (i.e. current inner loop in the control structure
And outer voltage) with the complex controll combined that feedovers.It is fed back using set end voltage and constitutes outer voltage, filter capacitor electric current is anti-
Feedback constitutes current inner loop, and outer voltage uses the PR controller for having the perfect Gain at resonance frequency to realize to a variety of power grids pair
Claim, effective inhibition of unbalanced fault, the stability and anti-interference ability of DVR can be improved, reduces steady-state error.Electric voltage feed forward control
The introducing of system enhances the interference rejection ability and stability of system, improves the dynamic of voltage compensation link jointly with feedback control cooperation
State property energy.
Current compensation APF model (unit) is defeated using the DFIG that the Harmonic currents detection method based on Instantaneous Power Theory is extracted
Reference value of the electric current after coordinate transform as compensation electric current out is fed back to form closed loop PR control with actual output current, be realized
Effective inhibition to a variety of harmonic currents.
In order to realize the independent control of two groups of AC ports of NSC, Time-sharing control is used in the present embodiment, utilizes upper and lower device
The exclusive or of switch state generates the switch state of common parts, realizes the decoupling control of upper and lower port output.It meets two about
Beam condition: same bridge arm has at any time and only there are two switch device conductives；The output voltage of any time upper end bridge arm
Higher than the output voltage of lower end bridge arm.Therefore when carrying out the modulation of NSC, the modulation wave profile of upper end bridge arm is higher than lower end bridge arm
Modulating wave, guarantee both do not intersect.
As shown in figure 4, setting NSC upper channel modulation reference signals as uDVR, upper channel modulated signal is umDVR, upward DC
Bias component is MDVR, lower channel modulation reference signals are uAPF, lower channel modulated signal is umAPF, downward direct current biasing component is
MAPF, triangle carrier signal uc, amplitude 1, if SI (i=1,4,7)Corresponding switch device conductive is indicated when being 1.By comparing modulation
The size relation of wave and carrier wave, obtaining the break-over of device logic of upper end bridge arm and lower end bridge arm, (upper end bridge arm takes modulated signal big
It is logic when carrier signal is 1,1) it be logic when being less than carrier signal is that lower end bridge arm, which takes modulated signal,.Switch device conductive
Meet following rule:
The occasion that DFIG wind power system improves power quality, promotes fault traversing, driving letter are realized in nine switch UPQC
In number modulated process, the modulated signal real-time change of lower channel.To avoid lower channel reference signal from being greater than upper channel with reference to letter
It number causes constraint to fail, on the basis of biasing, clipping, namely the maximum modulation of limitation lower channel is carried out to reference signal
Than.Enabling upper channel modulation ratio clipping is mDVR, lower channel mAPF, to make full use of DC voltage and ovennodulation being avoided to cause to lose
Very, the two should meet:
mDVR+mAPF≤1 (7)
Modulated signal meets following relationship:
Direct current biasing component meets following relationship:
Modulation system under nine switch topologies restrict causes voltage utilization lower, and DC voltage is higher.Herein
It is configured by the timesharing of modulation ratio clipping, overcomes that NSC voltage utilization is low to a certain extent, DC voltage is higher to be lacked
It falls into, provides scheme to reduce equipment cost.
The preferred embodiment that the calculating of DC capacitor voltage value of feedback can also provide according to the present invention in Fig. 4 is (in figure not
Show) it calculates, i.e., the dynamic electric voltage recovery device offset voltage value u sensed according to second voltage sensorDVRAnd first voltage
The u of sensor sensingAPF, active electric power filter is calculated according to the Active Power Filter-APF offset voltage value via adder
The voltage of inductance two sides in wave device, and the voltage of the inductance two sides is added into the dynamic electric voltage recovery device offset voltage value meter
Calculation obtains DC voltage value, then via subtracter, by the initial value of capacitance voltage subtract the DC voltage value obtain it is described straight
Galvanic electricity holds voltage feedback value.DC capacitor can be obtained according to first voltage sensor and second voltage sensor by being achieved in
Voltage feedback value reduces number of sensors, reduces sensing cost.
Specifically, in order to which the DC voltage to double-fed wind generator controls, in conjunction with the control structure and Fig. 5 of Fig. 4
Shown in the double-fed wind power generator group based on nine switch converters control device, further be described in detail specifically controlled
Journey.Specifically, as shown in figure 5, a kind of control device of the double-fed wind power generator group based on nine switch converters, comprising:
First voltage sensor is mounted on first current output terminal, for sensing Active Power Filter-APF compensation electricity
Pressure value；
Second voltage sensor is mounted on second current output terminal, for sensing dynamic electric voltage recovery device compensation electricity
Pressure value；
Arithmetic unit is connect, according to the active power filtering with the first voltage sensor and second voltage sensor
Device offset voltage value and dynamic electric voltage recovery device offset voltage value, are calculated DC capacitor voltage value of feedback；
PID controller is connect with the arithmetic unit, according to the DC capacitor voltage value of feedback and direct voltage reference value
The active component of the Active Power Filter-APF compensation current reference value of the first current output terminal of nine switch converters is obtained,
So as to obtain corresponding nine switch converters the first current output terminal Active Power Filter-APF compensation current.
Specifically, the arithmetic unit includes；
Adder is connect, according to the active power filtering with the first voltage sensor and second voltage sensor
The voltage of inductance two sides in Active Power Filter-APF is calculated in device offset voltage value, and the voltage of the inductance two sides is added
DC voltage value is calculated in the dynamic electric voltage recovery device offset voltage value；
The initial value of capacitance voltage is subtracted the DC voltage value and obtains the DC capacitor voltage feedback by subtracter
Value.
The present embodiment is by sensing Active Power Filter-APF offset voltage value using first voltage sensor；And utilize second
Voltage-sensor senses dynamic electric voltage recovery device offset voltage value；And then it is compensated by arithmetic unit according to the Active Power Filter-APF
Voltage value and dynamic electric voltage recovery device offset voltage value, are calculated DC capacitor voltage value of feedback；Further by PID control
Device is defeated according to the first electric current that the DC capacitor voltage value of feedback and direct voltage reference value obtain nine switch converters
The active component of the Active Power Filter-APF compensation current reference value of outlet, to obtain corresponding nine switch converters
The Active Power Filter-APF compensation current of first current output terminal, be only arranged from hardware cost first voltage sensor and
Second voltage sensor is for acquiring information, from control, can efficiently be sent out double-fed by arithmetic unit and PID controller
The DC voltage of motor group is controlled, and on the basis of realizing the DC-side Voltage Stabilization of double-fed wind generator, guarantees nine
Switch converters normally realize Active Power Filter-APF compensation and dynamic electric voltage recovery device compensation function.
With continued reference to Fig. 4, dynamic modulation ratio is the demand adjustment m according to voltage compensation side to output voltage sizeDVRWith
mAPFDistribution, it is integrated with power quality that the application by NSC solves DFIG fault traversing, when detecting Voltage Drop amplitude
Reach preset threshold, when such as 70% or 80%, starting depth falls mode, it is ensured that DFIG preferentially realizes fault traversing, into mDVR
For 1 i.e. direct current biasing component MDVRFor 0 mode, m at this timeAPFFor 0 i.e. MAPFFor -1 mode, seriously fall period APF in short-term in voltage
Out of service, dynamic modulation can be found in Fig. 4 than controlling tactic switch.
The side DVR and the side APF modulating wave a phase and carrier waveform such as Fig. 6 institute when nine switch UPQC are run by dynamic modulation ratio
Show and (uses the carrier wave lower than actual emulation frequency herein so that the modulation of observation long period involves carrier waveform).Assuming that
30% occurred at 0.3 second and slightly falls failure for network voltage, and 0.4 second when restores normal, and 80% depth occurs for 0.5 second when
Fall failure and continue 0.1 second, enters DVR at this time and preferentially run guarantee unit realization fault traversing, APF mode out of service.
As seen from the figure, when operating normally and slightly falling, if mDVR=0.5, then according to formula (9), direct current biasing amount MDVRIt is 0.5,
Direct current biasing amount MAPFIt is -0.5；It is preferential to realize LVRT function, i.e. DVR function when depth, which occurs, in network voltage falls failure,
Direct-current unloading circuit is put into operation simultaneously, at this time mDVRDynamic transition is 1, direct current biasing amount MDVRIt is 0, direct current biasing amount MAPF
It is -1, system only does DVR operation, and APF is out of service, is converted to a kind of upper operational mode again when voltage restores.In different works
The modulation wave profile for meeting upper end bridge arm under condition is higher than the modulation wave profile of lower end bridge arm, and the two is not intersected, to assist reality
The normal operation of existing nine switch UPQC.
The present embodiment is based on the insertion switch composite NSC in double-fed wind power system power quality and fault traversing control,
NSC flexibly can inject corresponding harmonic compensation current to power grid parallel connection, maintain the sine wave characteristics of power network current, NSC
Corresponding distortion compensation voltage flexibly can be injected to line series, maintain the stabilization of DFIG set end voltage, realize DFIG
Wind power system flexibility fault traversing (FFRT) operation, by the control that the double-fed wind power generator group based on nine switch converters is arranged
Device processed, is only arranged first voltage sensor from hardware cost and second voltage sensor is used to acquire information, from
In control, efficiently the DC voltage of double-fed wind generator can be controlled by arithmetic unit and PID controller, realized
On the basis of the DC-side Voltage Stabilization of double-fed wind generator, guarantee that nine switch converters normally realize that Active Power Filter-APF is mended
It repays and dynamic electric voltage recovery device compensation function.
It will appreciated by the skilled person that realizing all or part of step/units/modules of above-described embodiment
This can be accomplished by hardware associated with program instructions, and foregoing routine can store in computer-readable storage medium, should
When being executed, execution includes the steps that corresponding in above-described embodiment each unit program；And storage medium above-mentioned include: ROM,
The various media that can store program code such as RAM, magnetic disk or optical disc.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (5)
- It is described based on nine switch converters 1. a kind of control device of the double-fed wind power generator group based on nine switch converters Double-fed wind power generator group includes: sequentially connected wind energy conversion system, gear-box, double-fed generator, rotor-exciting frequency converter and nine Switch converters, the three-phase voltage that the first current output terminal parallel connection of nine switch converters accesses the double-fed generator pass Second current output terminal of defeated line, nine switch converters accesses the double-fed wind power generator group by transformer series The net side main line being connect with grid-connected tie point, which is characterized in that nine switch change-over includes the first branch in parallel, second Branch and third branch, the first branch include first switch device, second switch device and the third switch being sequentially connected in series Device；The second branch includes the 4th switching device, the 5th switching device and the 6th switching device being sequentially connected in series；Described Three branches include the 7th switching device, the 8th switching device and the 9th switching device being sequentially connected in series, nine switch converters It further include the DC capacitor with the first branch, second branch and third branch circuit parallel connection；The control device includes:First voltage sensor is mounted on first current output terminal, for sensing Active Power Filter-APF offset voltage value；Second voltage sensor is mounted on second current output terminal, for sensing dynamic electric voltage recovery device offset voltage value；Arithmetic unit is connect with the first voltage sensor and second voltage sensor, is mended according to the Active Power Filter-APF Voltage value and dynamic electric voltage recovery device offset voltage value are repaid, DC capacitor voltage value of feedback is calculated；PID controller is connect with the arithmetic unit, is obtained according to the DC capacitor voltage value of feedback with direct voltage reference value The active component of the Active Power Filter-APF compensation current reference value of first current output terminal of nine switch converters, so as to Obtain the Active Power Filter-APF compensation current of the first current output terminal of corresponding nine switch converters.
- 2. the control device of the double-fed wind power generator group as described in claim 1 based on nine switch converters, feature exist In the arithmetic unit includes；Adder is connect with the first voltage sensor and second voltage sensor, is mended according to the Active Power Filter-APF The voltage that inductance two sides in Active Power Filter-APF are calculated in voltage value is repaid, and by the voltage of the inductance two sides plus described DC voltage value is calculated in dynamic electric voltage recovery device offset voltage value；The initial value of capacitance voltage is subtracted the DC voltage value and obtains the DC capacitor voltage value of feedback by subtracter.
- 3. the control device of the double-fed wind power generator group as claimed in claim 1 or 2 based on nine switch converters, feature It is, the first current output terminal of nine switch converters includes first lead-out terminal, second output terminal and third output Terminal；The first end of the first lead-out terminal connects the branch between the second switch device and third switching device；Institute The first end for stating second output terminal connects branch between the 5th switching device and the 6th switching device；The third is defeated The first end of terminal connects the branch between the 8th switching device and the 9th switching device out；The first lead-out terminal The second end of second end, the second end of second output terminal and the third output terminal is separately connected double-fed generator Three-phase voltage transmission line；Second current output terminal of nine switch converters includes the first current terminal, the second current terminal and third current terminal Son；The first end of first current terminal connects the branch between the first switch device and second switch device；It is described The first end of second current terminal connects the branch between the 4th switching device and the 5th switching device；The third electric current The first end of terminal connects the branch between the 7th switching device and the 8th switching device；The of first current terminal The second end at two ends, the second end of second current terminal and the third current terminal is separately connected and grid-connected tie point The net side main line of connection.
- 4. the control device of the double-fed wind power generator group as claimed in claim 3 based on nine switch converters, feature exist In nine switch converters further include the discharging circuit in parallel with the DC capacitor.
- 5. the control device of the double-fed wind power generator group as claimed in claim 4 based on nine switch converters, feature exist In the first switch device, second switch device, third switching device, the 4th switching device, the 5th switching device, the 6th Switching device, the 7th switching device, the 8th switching device and the 9th switching device are IGBT device.
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| CN113595092A (en) * | 2021-06-30 | 2021-11-02 | 四川大学 | Composite fault ride-through control method, device, equipment and storage medium |
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| CN113014079B (en) * | 2019-12-19 | 2022-02-01 | 东元电机股份有限公司 | Frequency converter device and method for selectively outputting current according to output voltage value |
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