CN109104107A - The topological structure and control method of permanent magnet direct-drive type wind-driven generator generator-side converter wear - Google Patents

The topological structure and control method of permanent magnet direct-drive type wind-driven generator generator-side converter wear Download PDF

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Publication number
CN109104107A
CN109104107A CN201811192348.XA CN201811192348A CN109104107A CN 109104107 A CN109104107 A CN 109104107A CN 201811192348 A CN201811192348 A CN 201811192348A CN 109104107 A CN109104107 A CN 109104107A
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reference value
output
permanent magnet
drive type
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CN109104107B (en
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蔡彬
孙芃
闫绍敏
褚晓广
刘琦
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Qufu Normal University
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Qufu Normal University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J3/386—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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

Abstract

The present invention relates to the topological structures and control method of permanent magnet direct-drive type wind-driven generator generator-side converter wear, belong to technical field of wind power generation.The topological structure includes Vienna rectifier, DC/DC booster converter, and one end of Vienna rectifier is connected with the stator of permanent magnet direct-drive type wind-driven generator, and the other end is connected with DC/DC booster converter；The other end of DC/DC booster converter is connected with DC bus.The control method are as follows: Vienna rectifier realizes that generator harmonic wave minimizes using zero-sequence component injection method；DC/DC booster converter realizes boosting and wind-driven generator MPPT maximum power point tracking control.The present invention overcomes the defects of the intrinsic high peak voltage pulse of conventional voltage source current transformer, reduce generator stator insulator requirement, reduce generator simplified manufacturing process, cost；Current harmonics is small, avoids generating additional mechanical oscillation and phenomenon of torsional vibration, switching device receiving voltage is low, is especially suitable for high voltage, large-power occasions.

Description

The topological structure and control method of permanent magnet direct-drive type wind-driven generator generator-side converter wear
Technical field
The present invention relates to a kind of current transformer, the topology knot of especially a kind of permanent magnet direct-drive type wind-driven generator generator-side converter wear Structure and control method, belong to technical field of wind power generation.
Background technique
Traditional permanent magnet direct-drive type wind-driven generator generator-side converter wear generally using can not control rectifier+Boost combination or The topological structures such as voltage source converter VSC.Can not control rectifier will cause a large amount of harmonic waves, the harmonic wave in stator current to generate electricity Contain ripple in machine torque profile, and torque ripple may also can make Wind turbines generate additional mechanical oscillation and torsional oscillation.It is right In voltage source converter VSC, though controlled rectification, high peak voltage pulse caused by its du/dt will determine generator Sub- winding insulation causes greatly to threaten, this, which allows for motor, to design fully according to high-voltage generator, to increase winding Insulation thickness and motor cost, and the radiating condition of motor is made to degenerate.
Summary of the invention
It is a primary object of the present invention to: in view of the deficiency of the prior art, it is small, resistance to provide a kind of harmonic content The topological structure and control method for a kind of permanent magnet direct-drive type wind-driven generator generator-side converter wear for pressing grade high.
In order to reach the goals above, the topological structure of permanent magnet direct-drive type wind-driven generator generator-side converter wear of the present invention includes dimension Also rectifier and DC/DC booster converter are received；One end of the Vienna rectifier and the permanent magnet direct-drive type wind-driven generator Stator be connected, the other end is connected with one end of the DC/DC booster converter；The other end of the DC/DC booster converter It is connected with DC bus.
The Vienna rectifier includes three filter inductances, six rectifier diodes, three two-way switch units, two Output capacitance；One end of three filter inductances is connected with the three-phase stator winding of permanent magnet direct-drive type wind-driven generator respectively； The two-way switch unit is made of two switching tubes, is controlled by driving signal all the way；Described two output capacitances are that series connection connects It connects, wherein what is be connected with the DC output end anode of the Vienna rectifier is known as upper capacitor, with the Vienna rectifier DC output end 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, is used for institute State the DC output voltage V of Vienna rectifierdcLevel needed for rising to the DC bus, especially in low wind speeds；It is real simultaneously Existing permanent magnet direct-drive type wind-driven generator MPPT maximum power point tracking control.
A kind of control method of permanent magnet direct-drive type Wind turbines generator-side converter wear of the present invention, comprising the following steps:
Step 1, the Vienna rectifier realizes that harmonic wave minimizes rectification, specific steps using zero-sequence component injection method Are as follows:
11) frequency and the transformable three-phase alternating current of amplitude of the stator output of the permanent magnet direct-drive type wind-driven generator After three filter inductances of the Vienna rectifier, its voltage is denoted as u respectivelya、ub、uc, electric current is denoted as i respectivelya、 ib、ic；By ua、ub、ucU is obtained through abc/dq coordinate transformdAnd uq；By ia、ib、icI is obtained through abc/dq coordinate transformdAnd iq；
12) by idReference value id_refWith current actual value idDifference through PI controller, output is used as udReference value ud_ref；
13) by the DC output voltage reference value V of the Vienna rectifierdc_refWith its currently practical measured value VdcIt For difference through PI controller, output is iqReference value iq_ref；By this reference value iq_refWith current actual value iqDifference controlled through PI Device, output are used as uqReference value uq_ref；
14) the reference value u obtained by step 12) and 13)d_refAnd uq_ref, voltage u is obtained through abc/dq inverse transformationa、ub、 ucReference value ua_ref、ub_ref、uc_ref, find out ua_ref、ub_ref、uc_refIn maximum value and be denoted as umax, find out ua_ref、 ub_ref、uc_refIn minimum value and be denoted as umin；
15) zero-sequence component u is calculated by formula (1)0:
u0=-(umax+umin)/2 (1)
16) △ V=V is enabled1-V2, wherein V1For the both end voltage of the upper capacitor of the Vienna rectifier, V2For the dimension Also receive rectifier lower capacitor both end voltage；The reference value of △ V is denoted as △ Vref；
17) by △ Vref/Vdc_refWith its current actual value △ V/VdcDifference through PI controller, output be denoted as it is uneven because Sub- k；The u that this unbalance factor k and step 5) are obtained0It is added, obtains the zero-sequence component u for needing to inject0_inj；
18) the zero-sequence component u that the needs for obtaining step 17) inject0_injThe u obtained respectively with step 14)a_ref、 ub_ref、uc_refIt is added, obtains revised voltage reference value ua_refm、ub_refm、uc_refm；
19) by revised voltage reference value ua_refm、ub_refm、uc_refmIt is obtained by carried based PWM (CB-PWM) The driving signal of three two-way switch units of the Vienna rectifier drives three two-way switch cell operations.
Step 2, the DC/DC booster converter uses method control as follows, realizes the permanent magnet direct-drive type wind-power electricity generation The MPPT maximum power point tracking of machine controls:
21) wind speed v is measuredw；
22) according to wind speed-active power curves of the permanent magnet direct-drive type wind-driven generator, current wind speed v is obtainedwUnder Output power reference value Pref；
23) by this reference value PrefDivided by the average anode current i of presently described Vienna rectifierdcObtain the dimension Receive the DC output end voltage reference value V of rectifierdc_ref；
24) by this reference value Vdc_refWith its currently practical measured value VdcDifference through PI controller, output is the direct current The current reference value i of busdcbus_ref；
25) by this reference value idcbus_refWith its currently practical measured value idcbusDifference through PI controller, output and sawtooth Bobbi is compared with the driving signal to get the switching tube into the DC/DC booster converter.
Compared with prior art, the beneficial effects of the present invention are:
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 of the present invention is especially suitable for high voltage, large-power occasions；Current transformer simultaneously In switching device cost substantially reduce, 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 permanent magnet direct-drive type wind-driven generator generator-side converter wear of the present invention.
Fig. 2 is the permanent magnet direct-drive type wind generator system topology example using generator-side converter wear of the present invention.
Fig. 3 is the flexible HVDC transmission system topology example constituted using generator-side converter wear of the present invention.
Fig. 4 is the control block diagram of Vienna rectifier of the present invention.
Fig. 5 is the control block diagram of DC/DC booster converter of the present invention.
Wherein, the Vienna 1- rectifier；2-DC/DC booster converter；3- permanent magnet direct-drive type wind-driven generator；4- direct current is female Line；5- grid-side converter；6- sending end station current transformer；7- direct current cables；8- is by end station current transformer
Specific embodiment
With reference to the accompanying drawing, invention is further described in detail.
As shown in Figure 1, a kind of topological structure of permanent magnet direct-drive type wind-driven generator generator-side converter wear of the present invention, including dimension Receive rectifier 1 and DC/DC booster converter 2；One end of Vienna rectifier 1 and the stator of permanent magnet direct-drive type wind-driven generator 3 It is connected, the other end is connected with DC/DC booster converter 2, and the other end of DC/DC booster converter 2 is connected with DC bus 4.
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 stator with permanent magnet direct-drive type wind-driven generator 3 respectively Three-phase windings 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 It is respectively connected with the tie point of rectifier diode VD1 and VD2, VD3 and VD4, VD5 and VD6；Three two-way switch cell Ssa、Sb、 ScThe other end be shorted and be connected with O point；Each two-way switch unit is made of two switching tubes, the two Opposite direction connection, by one The control of road driving signal.
DC/DC booster converter 2 includes inductance L, switching tube VT, fast recovery diode VD, capacitor C, it will be for that will tie up Also the DC output voltage of rectifier 1 received rises to DC bus 4 and works required level, especially low wind speeds；It realizes simultaneously most High-power tracing control.As an example, as shown in Fig. 2, DC bus 4 can be followed by grid-side converter 5, grid-side converter 5 is real Existing cutting-in control, such generator-side converter wear (being made of Vienna rectifier 1 and DC/DC booster converter 2) and grid-side converter 5 Just constitute permanent magnet direct-drive type wind power unit converter.As another example, as shown in figure 3, DC bus 4 can also be followed by sending end Current transformer 6 (being a kind of DC/DC current transformer) of standing further is boosted, and is connected by direct current cables 7 with by end station current transformer 8, Constitute flexible HVDC transmission system.
A kind of control method of permanent magnet direct-drive type wind-driven generator generator-side converter wear of the present invention, comprising the following steps:
Step 1, as Figure 1 and Figure 4, Vienna rectifier 1 realizes that harmonic wave minimum is whole using zero-sequence component injection method Stream, specific steps are as follows:
11) the transformable three-phase alternating current warp of the frequency and amplitude that the stator of permanent magnet direct-drive type wind-driven generator 3 issues Three filter inductance L of Vienna rectifier 1a、Lb、LcAfterwards, by the voltage of a, b, c point, voltage is denoted as u respectivelya、ub、uc, electricity Stream is denoted as ia、ib、ic, by ua、ub、ucU is obtained through abc/dq coordinate transformdAnd uq；By ia、ib、icIt is obtained through abc/dq coordinate transform To idAnd iq, wherein idIt is related with reactive power, iqIt is related with active power, therefore, idReference value id_refIt may be configured as 0, with Realize that unity power factor is run, and iqReference value iq_refIt is taken from the DC output end voltage PI control of Vienna rectifier 1 Device (Fig. 4) processed；
12) by idReference value id_ref(i can be enabledd_ref=0) with current actual value idDifference through PI controller, output is made For udReference value ud_ref；
13) by the DC output end voltage reference value V of Vienna rectifier 1dc_refWith its currently practical measured value VdcDifference Through PI controller, output is iqReference value iq_ref；By this reference value iq_refWith current actual value iqDifference through PI controller, It, which is exported, is used as uqReference value uq_ref；
14) the reference value u obtained by step 12) and 13)d_refAnd uq_ref, voltage u is obtained through abc/dq inverse transformationa、ub、 ucReference value ua_ref、ub_ref、uc_ref, and by ua_ref、ub_ref、uc_refIn maximum value be denoted as umax, by ua_ref、ub_ref、 uc_refIn minimum value be denoted as umin, it may be assumed that
umax=max (ua_ref,ub_ref,uc_ref),
umin=min (ua_ref,ub_ref,uc_ref)；
15) zero-sequence component u is calculated by formula (1)0:
u0=-(umax+umin)/2 (1)
16) △ V=V is enabled1-V2, wherein V1For the upper capacitor C of Vienna rectifier 11Both end voltage, V2For Vienna rectification The lower capacitor C of device 12Both end voltage；The reference value of △ V is denoted as △ Vref；
17) by △ Vref/Vdc_refWith its current actual value △ V/VdcDifference through PI controller, output be denoted as it is uneven because Sub- k, it reflects upper capacitor C1With lower capacitor C2Balance of voltage situation；The u that this unbalance factor k and step 15) are obtained0Phase Add, obtains the zero-sequence component u for needing to inject0_inj, it may be assumed that
u0_inj=u0+ k=(umax+umin)/2+k
18) the zero-sequence component u that the needs for obtaining step 17) inject0_injThe u obtained respectively with step 14)a_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
19) by revised voltage reference value ua_refm、ub_refm、uc_refmIt is obtained by carried based PWM (CB-PWM) Three two-way switch cell Ss of Vienna rectifier 1a、Sb、ScDriving signal, drive three two-way switch cell Ssa、Sb、Sc Work.
Step 2, as shown in Figure 1, shown in Figure 5, DC/DC booster converter 2 uses method control as follows, realizes permanent magnet direct-drive type wind The MPPT maximum power point tracking of power generator 3 controls:
21) wind speed v is measuredwWith the average anode current i of current Vienna rectifier 1dc, DC output end voltage Vdc, it is straight Flow the electric current i of bus 4dcbus；
22) according to wind speed-active power curves of permanent magnet direct-drive type wind-driven generator 3, current wind speed v is obtainedwUnder it is defeated Value and power reference P outref；
23) by this reference value PrefDivided by the average anode current i of current Vienna rectifier 1dcObtain Vienna rectifier 1 DC output end voltage reference value Vdc_ref；
24) by this reference value Vdc_refWith its currently practical measured value VdcDifference through PI controller, output is DC bus 4 DC current reference value idcbus_ref；
25) by this reference value idcbus_refWith the electric current actual measured value i of current DC bus 4dcbusDifference controlled through PI Device exports compared with sawtooth wave to get the driving signal for the switching tube VT for arriving DC/DC booster converter 2.

Claims (2)

1. the topological structure of permanent magnet direct-drive type wind-driven generator generator-side converter wear, it is characterised in that: including Vienna rectifier and DC/DC booster converter；One end of the Vienna rectifier is connected with the stator of the permanent magnet direct-drive type wind-driven generator, separately One end is connected with one end of the DC/DC booster converter；The other end of the DC/DC booster converter and DC bus phase Even；
The Vienna rectifier includes three filter inductances, six rectifier diodes, three two-way switch units, two outputs Capacitor；One end of three filter inductances is connected with the three-phase stator winding of the permanent magnet direct-drive type wind-driven generator respectively； The two-way switch unit is made of two switching tubes, is controlled by driving signal all the way；Described two output capacitances are that series connection connects It connects, wherein the output capacitance being connected with the DC output end anode of the Vienna rectifier is known as upper capacitor, with the dimension The referred to as lower capacitor of output capacitance that the DC output end cathode of rectifier of receiving is connected；
The DC/DC booster converter includes inductance L, switching tube VT, fast recovery diode VD, capacitor C, is used for the dimension Also the DC output voltage V of rectifier is receiveddcLevel needed for rising to the DC bus, while realizing permanent magnet direct-drive type wind-power electricity generation Machine MPPT maximum power point tracking control.
2. a kind of control method of permanent magnet direct-drive type wind-driven generator generator-side converter wear as described in claim 1, feature exist In: use following steps:
Step 1, the Vienna rectifier realizes that harmonic wave minimizes rectification, specific steps using zero-sequence component injection method are as follows:
11) frequency of the stator output of the permanent magnet direct-drive type wind-driven generator and the transformable three-phase alternating current of amplitude are through institute After three filter inductances for stating Vienna rectifier, its voltage is denoted as u respectivelya、ub、uc, electric current is denoted as i respectivelya、ib、ic； By ua、ub、ucU is obtained through abc/dq coordinate transformdAnd uq；By ia、ib、icI is obtained through abc/dq coordinate transformdAnd iq；
12) by idReference value id_refWith current actual value idDifference through PI controller, output is used as udReference value ud_ref；
13) by the DC output voltage reference value V of the Vienna rectifierdc_refWith its currently practical measured value VdcDifference warp PI controller, output are iqReference value iq_ref；By this reference value iq_refWith current actual value iqDifference through PI controller, Output is used as uqReference value uq_ref；
14) the reference value u obtained by step 12) and 13)d_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 be denoted as umax, find out ua_ref、ub_ref、 uc_refIn minimum value and be denoted as umin；
15) zero-sequence component u is calculated by formula (1)0:
u0=-(umax+umin)/2 (1)
16) △ V=V is enabled1-V2, wherein V1For the both end voltage of the upper capacitor of the Vienna rectifier, V2For the Vienna The both end voltage of the lower capacitor of rectifier；The reference value of △ V is denoted as △ Vref；
17) by △ Vref/Vdc_refWith its current actual value △ V/VdcDifference through PI controller, output is denoted as unbalance factor k； The u that this unbalance factor k and step 5) are obtained0It is added, obtains the zero-sequence component u for needing to inject0_inj；
18) the zero-sequence component u that the needs for obtaining step 17) inject0_injThe u obtained respectively with step 14)a_ref、ub_ref、 uc_refIt is added, obtains revised voltage reference value ua_refm、ub_refm、uc_refm；
19) by revised voltage reference value ua_refm、ub_refm、uc_refmIt is whole that the Vienna is obtained by carried based PWM The driving signal for flowing three two-way switch units of device, drives three two-way switch cell operations.
Step 2, the DC/DC booster converter uses method control as follows, realizes the permanent magnet direct-drive type wind-driven generator MPPT maximum power point tracking control:
21) wind speed v is measuredw；
22) according to wind speed-active power curves of the permanent magnet direct-drive type wind-driven generator, current wind speed v is obtainedwUnder output Value and power reference Pref；
23) by this reference value PrefDivided by the average anode current i of presently described Vienna rectifierdcIt is whole to obtain the Vienna Flow the DC output end voltage reference value V of devicedc_ref；
24) by this reference value Vdc_refWith its currently practical measured value VdcDifference through PI controller, output is the DC bus Current reference value idcbus_ref；
25) by this reference value idcbus_refWith its currently practical measured value idcbusDifference through PI controller, output and sawtooth wave ratio Compared with the driving signal to get the switching tube into the DC/DC booster converter.
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CN113270941A (en) * 2021-05-28 2021-08-17 广东电网有限责任公司 Low-voltage alternating current-direct current power distribution mode conversion system and time sequence control method and device thereof
CN113783436A (en) * 2021-09-27 2021-12-10 广东电网有限责任公司阳江供电局 Full-power wind power converter and control method
CN113922427A (en) * 2021-07-17 2022-01-11 深圳市禾望电气股份有限公司 Power adjusting method for realizing autonomous frequency modulation of wind turbine generator
CN117318553A (en) * 2023-09-29 2023-12-29 曲阜师范大学 Low-wind-speed permanent magnet direct-driven wind turbine control method based on TD3 and Vienna rectifier

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