CN208782502U - A kind of topological structure of the directly driven wind-powered current transformer of vertical axis permanent magnet - Google Patents
A kind of topological structure of the directly driven wind-powered current transformer of vertical axis permanent magnet Download PDFInfo
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- CN208782502U CN208782502U CN201821665745.XU CN201821665745U CN208782502U CN 208782502 U CN208782502 U CN 208782502U CN 201821665745 U CN201821665745 U CN 201821665745U CN 208782502 U CN208782502 U CN 208782502U
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The utility model relates to a kind of topological structures of the directly driven wind-powered current transformer of vertical axis permanent magnet, belong to technical field of wind power.The topological structure includes grid-side converter and the generator-side converter wear that is made of Vienna rectifier and DC/DC booster converter, and generator-side converter wear one end is connected with the stator of generator, and the other end is connected with DC bus；The other end of DC bus is connected with grid-side converter.Vienna rectifier realizes that harmonic wave minimizes；DC/DC booster converter realizes boosting and pressure stabilizing；Grid-side converter realizes generator active power control and cutting-in control.The utility model makes Stator Current Harmonic small, and no mechanical oscillation and phenomenon of torsional vibration overcome the defect of high peak voltage pulse, reduce generator insulating requirement, makes the reduction of generator manufacturing cost；Switching device receiving voltage is low, is especially suitable for high voltage, large-power occasions.
Description
Technical field
The utility model relates to a kind of current transformer, the topology knot of especially a kind of directly driven wind-powered current transformer of vertical axis permanent magnet
Structure belongs to technical field of wind power generation.
Background technique
Traditional Wind turbines use the current transformer of back to back structure, it includes generator-side converter wear and grid-side converter,
Middle generator-side converter wear generally use voltage source converter VSC, can not control rectifier+Boost combination etc. topological structures.It is uncontrollable whole
Stream device will cause a large amount of harmonic waves, and the harmonic wave in stator current to contain ripple in wind-driven generator torque profile, and torque line
Wave may make Wind turbines generate additional mechanical oscillation and torsional oscillation.And for voltage source converter VSC, though it is controllable whole
Stream, but high peak voltage pulse caused by its du/dt will cause greatly to threaten to the stator winding insulation of wind-driven generator,
It is confidential fully according to high-voltage motor design that this allows for wind-power electricity generation, so that the insulation thickness and motor cost of winding are increased,
And the radiating condition of generator is made to degenerate.
Summary of the invention
The main purpose of the utility model is that: in view of the deficiency of the prior art, provide a kind of harmonic content
A kind of topological structure of the directly driven wind-powered current transformer of vertical axis permanent magnet small, stress levels are high.
In order to reach the goals above, a kind of topological structure of the directly driven wind-powered current transformer of vertical axis permanent magnet of the utility model includes
Generator-side converter wear and grid-side converter；The generator-side converter wear includes Vienna rectifier, DC/DC booster converter；The machine
Side current transformer one end is connected with the stator of vertical axis permanent magnet direct wind-driven generator, and the other end is connected with DC bus；It is described straight
The other end of stream bus is connected with grid-side converter；The grid-side converter is connected by the Industrial Frequency Transformer that boosts with power grid.
One end of the Vienna rectifier is connected with the stator of the vertical axis permanent magnet direct wind-driven generator, the other end
It is connected with one end of the DC/DC booster converter；The other end of the DC/DC booster converter and the DC bus phase
Even.
The Vienna rectifier includes three filter inductances, six rectifier diodes, three two-way switch units, two
Output capacitance；Three filter inductances three-phase stator winding phase with the vertical axis permanent magnet direct wind-driven generator respectively
Even；The two-way switch unit is made of two switching tubes, is controlled by driving signal all the way；Described two output capacitances are series connection
Connection, wherein what is be connected with the direct current output anode of the Vienna rectifier is known as upper capacitor, with the Vienna rectifier
Direct current output cathode be connected be known as lower capacitor.
The DC/DC booster converter includes inductance L, switching tube VT, fast recovery diode VD, capacitor C, effect
It is: 1) DC output voltage of the Vienna rectifier is boosted, especially in low wind speeds；2) it is female to stablize the direct current
The voltage of line.
The grid-side converter is traditional voltage source converter VSC, including DC bus capacitor Cg, 6 switching tubes, 1
Filter, but its effect is: it realizes vertical axis permanent magnet direct wind-driven generator active power controller, while realizing inversion grid connection.
Compared with prior art, the utility model has the beneficial effects that
1) Vienna rectifier has many advantages, such as regardless of dead zone, harmonic content is small, power density is big, overcomes tradition
Voltage source converter is caused inherent shortcoming as high peak voltage pulse as du/dt, to reduce the stator of generator
Winding insulation requirement reduces generator simplified manufacturing process, cost；Make aerogenerator stator current harmonics small simultaneously,
Wind turbines are avoided to generate additional mechanical oscillation and phenomenon of torsional vibration.
2) since the voltage that the switching device in the rectifier of Vienna is born is only conventional voltage source current transformer VSC one
Half, functional reliability is improved, so that current transformer described in the utility model is especially suitable for high voltage, large-power occasions；Same time-varying
Switching device cost in stream device substantially reduces, and therefore, even if increasing DC/DC booster converter, overall cost not will increase.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of the directly driven wind-powered current transformer of the utility model vertical axis permanent magnet.
Fig. 2 is the wind generator system topology example using the directly driven wind-powered current transformer of the utility model vertical axis permanent magnet.
Fig. 3 is the control block diagram of Vienna rectifier described in the utility model.
Fig. 4 is the control block diagram of DC/DC booster converter described in the utility model.
Fig. 5 is the control block diagram of grid-side converter described in the utility model.
Wherein, 1- generator-side converter wear；2- grid-side converter；3- vertical axis permanent magnet direct wind-driven generator；4- DC bus；
The Vienna 11- rectifier；12-DC/DC booster converter
Specific embodiment
With reference to the accompanying drawing, the utility model is described in further detail.
As shown in Figure 1 and Figure 2, a kind of topological structure of the directly driven wind-powered current transformer of vertical axis permanent magnet of the present invention, including pusher side become
Flow device 1 and grid-side converter 2；Generator-side converter wear 1 includes Vienna rectifier 11 and DC/DC booster converter 12；Pusher side unsteady flow
One end of device 1 is connected with the stator of vertical axis aerogenerator 3, and the other end is connected with DC bus 4, it may be assumed that Vienna rectifier
11 one end is connected with the stator of vertical axis aerogenerator 3, and the other end is connected with one end of DC/DC booster converter 12；DC/
The other end of DC booster converter 12 is connected with DC bus 4；The other end of DC bus 4 is connected with grid-side converter 2；Net side
Current transformer 2 is connected by boosting Industrial Frequency Transformer (see Fig. 2) with power grid.
As shown in Figure 1, Vienna rectifier 11 includes three filter inductance La、Lb、Lc, six rectifier diode VD1~
VD6, three two-way switch cell Ssa、Sb、Sc, two output capacitance C1、C2, C1With C2Series connection, the two tie point are O, C1On referred to as
Capacitor, C2Referred to as descend capacitor；Three filter inductance La、Lb、LcOne end respectively with the stator three-phase of vertical axis aerogenerator 3
Winding be connected, the other end is denoted as a, b, c point, respectively with three two-way switch cell Ssa、Sb、ScOne end be connected, and with it is whole
The tie point for flowing diode VD1 and VD2, VD3 and VD4, VD5 and VD6 is respectively connected with；Three two-way switch cell Ssa、Sb、Sc's
The other end is shorted and is connected with O point；Each two-way switch unit is made of two switching tubes, the two Opposite direction connection, by driving all the way
Dynamic signal control.
DC/DC booster converter 12 includes inductance L, switching tube VT, fast recovery diode VD, capacitor C, for that will tie up
Receive the DC output voltage V of rectifier 11dcIt boosts, especially low wind speeds；Make the voltage V of DC bus 4 simultaneouslydcbus
Stablize.
Grid-side converter 2 is traditional voltage source converter VSC, including DC bus capacitor Cg, 6 switching tube VT1~VT6、
Filter, effect is: realizing the output power of permanent magnet direct-drive type wind-driven generator 3, while realizing inversion grid connection control.
The control method of the above-mentioned directly driven wind-powered current transformer of vertical axis permanent magnet is as follows:
1) Vienna rectifier 11 realizes that harmonic wave minimizes rectification using zero-sequence component injection method: as shown in Figure 1, Figure 3, first
The voltage of a, b, c point in Vienna rectifier 11 is first denoted as u respectivelya、ub、uc, electric current is denoted as ia、ib、ic；By ua、ub、
ucIt converts to obtain u through abc/dqdAnd uq；By ia、ib、icIt converts to obtain i through abc/dqdAnd iq, wherein idIt is related with reactive power,
iqIt is related with active power, therefore, idReference value id_refIt may be configured as 0, to realize that unity power factor is run, and iqGinseng
Examine value iq_refIt is taken from the DC output voltage PI controller of Vienna rectifier 11；
Secondly, by idReference value id_ref(i can be enabledd_ref=0) with current actual value idDifference through PI controller, output
As udReference value ud_ref；By the DC output voltage reference value V of Vienna rectifier 11dc_refWith its currently practical measurement
Value VdcDifference through PI controller, output is iqReference value iq_ref；By this reference value iq_refWith current actual value iqDifference warp
PI controller, output are used as uqReference value uq_ref；
Third, by reference value u obtained aboved_refAnd uq_ref, voltage u is obtained through abc/dq inverse transformationa、ub、ucGinseng
Examine value ua_ref、ub_ref、uc_ref, find out ua_ref、ub_ref、uc_refIn maximum value, and this maximum value is denoted as umax, find out
ua_ref、ub_ref、uc_refIn minimum value, and this minimum value is denoted as umin, it may be assumed that
umax=max (ua_ref,ub_ref,uc_ref),
umin=min (ua_ref,ub_ref,uc_ref)；
4th, zero-sequence component u is calculated by formula (1)0:
u0=-(umax+umin)/2 (1)
5th, enable △ V=V1-V2, wherein V1For the upper capacitor C of Vienna rectifier 111Both end voltage, V2For dimension
Receive the lower capacitor C of rectifier 112Both end voltage；The reference value of △ V is denoted as △ Vref；By △ Vref/Vdc_refIt is currently practical with it
Value △ V/VdcDifference through PI controller, output is denoted as unbalance factor k, it reflects upper capacitor C1With lower capacitor C2Voltage it is flat
Weigh situation；The u that this unbalance factor k and step 15) are obtained0It is added, obtains the zero-sequence component u for needing to inject0_inj, it may be assumed that
u0_inj=u0+ k=(umax+umin)/2+k
Then by u0_injRespectively with u obtained abovea_ref、ub_ref、uc_refIt is added, obtains revised voltage reference value
ua_refm、ub_refm、uc_refm, it may be assumed that
ua_refm=ua_ref+u0_inj
ub_refm=ub_ref+u0_inj
uc_refm=uc_ref+u0_inj
Finally, by revised voltage reference value ua_refm、ub_refm、uc_refmIt is obtained by carried based PWM (CB-PWM)
To three two-way switch cell Ss of Vienna rectifier 11a、Sb、ScDriving signal, drive three two-way switch cell Ssa、Sb、
ScWork.
2) DC/DC booster converter 12 uses method control as follows, realizes 4 voltage V of DC busdcbusStabilization: as scheme
1, shown in Fig. 4, by the voltage reference value V of DC bus 4dcbus_refWith its current actual value VdcbusDifference through PI controller, it is defeated
It is out the average anode current reference value i of Vienna rectifier 11dc_ref；By this reference value idc_refWith current Vienna rectifier
11 average anode current actual measured value idcDifference through PI controller, the output of the PI controller compared with sawtooth wave to get
To the driving signal of the switching tube VT in DC/DC booster converter 12, boosting, voltage stabilizing function are realized.
3) grid-side converter 2 uses method control as follows, realizes the active power control of permanent magnet direct-drive type wind-driven generator 3
System: as shown in Figure 1, shown in Figure 5, measurement wind speed v firstw；Measure three-phase power grid voltage uga、ugb、ugcWith three-phase current on line side iga、igb、
igc；
Secondly, by uga、ugb、ugcThe phase angle θ of network voltage is obtained through phase-locked loop pllg, by iga、igb、igcThrough abc/dq
Transformation obtains idgAnd iqg；By uga、ugb、ugcIt converts to obtain u through abc/dqdgAnd uqg, using based on voltage oriented control strategy,
By network voltage vector oriented on the d axis of synchronous coordinate system, to have: udg=ug, uqg=0, it thus can calculate system
Active-power PgAnd reactive power QgIt is respectively as follows:
Pg=1.5udgidg (2)
Qg=-1.5udgiqg (3)
Third obtains current wind speed according to wind speed-active power curves (MPPT curve) of vertical axis aerogenerator 3
vwUnder grid-connected active power reference value Pg_ref, according to formula (2), by this Pg_refDivided by 1.5udgObtain the reference of net side d shaft current
Value idg_ref, by this idg_refWith its current actual value idgDifference through PI controller, output is the d shaft voltage of grid-side converter 2
Reference value udi_ref；According to formula (3), by grid-connected reactive power reference qref Qg_refDivided by -1.5udgObtain the reference of net side q shaft current
Value iqg_ref, by this iqg_refWith its current actual value iqgDifference through PI controller, output is the q shaft voltage of grid-side converter 2
Reference value uqi_ref；As grid-connected reactive power reference qref Qg_refWhen being set as 0, then grid-side converter 2 realizes unity power factor fortune
Row, such as Qg_refIt is set as negative, then grid-side converter 2 realizes leading power factor operation, such as Qg_refIt is set as positive number, then net side becomes
It flows device 2 and realizes lagging power-factor operation；
Finally, by the voltage reference value u of grid-side converter 2 obtained abovedi_refAnd uqi_ref, through dq/ α β coordinate transform
After obtain uαi_refAnd uβi_ref, the driving signal of the switching tube of grid-side converter 2 is generated after SVPWM is modulated, to Wind turbines
Grid-connected active power and reactive power be adjusted, realize vertical axis aerogenerator 3 active power of output control and simultaneously
Network control system.
Claims (2)
1. a kind of topological structure of the directly driven wind-powered current transformer of vertical axis permanent magnet, including generator-side converter wear and grid-side converter, special
Sign is: the generator-side converter wear includes Vienna rectifier, DC/DC booster converter；Described generator-side converter wear one end and hang down
The stator of d-axis permanent magnet direct-driving aerogenerator is connected, and the other end is connected with DC bus；The other end of the DC bus with
The grid-side converter is connected；The other end of the grid-side converter is connected by the Industrial Frequency Transformer that boosts with power grid.
2. the topological structure of the directly driven wind-powered current transformer of a kind of vertical axis permanent magnet according to claim 1, it is characterised in that: described
One end of Vienna rectifier is connected with the stator of the vertical axis permanent magnet direct wind-driven generator, the Vienna rectifier
The other end is connected with the DC/DC booster converter；The other end of the DC/DC booster converter and the DC bus phase
Even.
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| CN108988395A (en) * | 2018-10-13 | 2018-12-11 | 曲阜师范大学 | A kind of topological structure and control method of the directly driven wind-powered current transformer of vertical axis permanent magnet |
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| CN108988395A (en) * | 2018-10-13 | 2018-12-11 | 曲阜师范大学 | A kind of topological structure and control method of the directly driven wind-powered current transformer of vertical axis permanent magnet |
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