CN104795835B - Control method and system for controlling switching frequency of double-fed wind power converter - Google Patents
Control method and system for controlling switching frequency of double-fed wind power converter Download PDFInfo
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- CN104795835B CN104795835B CN201510136652.2A CN201510136652A CN104795835B CN 104795835 B CN104795835 B CN 104795835B CN 201510136652 A CN201510136652 A CN 201510136652A CN 104795835 B CN104795835 B CN 104795835B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005457 optimization Methods 0.000 claims abstract description 54
- 238000005516 engineering process Methods 0.000 claims description 14
- 238000004422 calculation algorithm Methods 0.000 claims description 12
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 description 19
- 230000005611 electricity Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
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Classifications
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- H02J3/386—
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention relates to a control method and system for controlling switching frequency of a double-fed wind power converter. The method includes the steps of 1, detecting running speed of a double-fed wind generator; 2, acquiring a switching frequency optimization feature table, and searching the switching frequency optimization feature table to acquire rotor side converter optimization switching frequency f<sw_opt>(t) corresponding to the running speed; 3, according to the rotor side converter optimization switching frequency f<sw_opt>(t), dynamically adjusting PWM (pulse width modulation) pulse period T<PWM>(t), and generating PWM pulses according to PWM pulse duty factor D(t) to control a rotor side converter. Compared with the prior art, the control method and system has the advantages such that running reliability and efficiency is improved at the premise of not affecting other running performances of a wind power unit, and the control method and system is simple and economical.
Description
Technical field
The present invention relates to a kind of converter switches frequency optimization control field, especially relate to a kind of double-fed wind energy converter
The control method of switching frequency and system.
Background technology
Develop through continuous, wind-power electricity generation has become as the important means that the mankind solve energy crisis and environmental problem, so
And the progress with technology, market requires more and more higher, improves reliability and can reduce wind to the technical and economic performance of Wind turbines
Group of motors O＆M cost, increase operation rate, be the important technology of current wind-powered electricity generation industry extensive concern, especially for offshore wind farm,
Because bad environments, accessibility are poor, offshore wind turbine O＆M difficulty, high cost, downtime are long, and these are all to running of wind generating set
Reliability proposes new challenge.
Wind electric converter is one of fault rate highest part in Wind turbines, particularly double-fed fan rotor side unsteady flow
Device, because capacity is less and running frequency is low, its operational reliability receives much attention, and reduces with current transformer running frequency, switch
The transient state thermal impedance of device (including igbt and diode) increases so that device runs junction temperature (includes maximum temperature, mean temperature
And temperature fluctuation) increase, affect current transformer short-term (mainly being affected by device maximum temperature) and (be mainly subject to device temperature wave for a long time
Move and mean temperature) operational reliability.
Reduce device operation junction temperature and be remarkably improved double-fed fan rotor side converter operational reliability, for this domestic external-open
Open up numerous studies, correlation technique is summed up and can be divided into following three kinds:
1) rotor-side converter fall holds running technology, and this is widely used technology in current engineering, by increasing rotor
Side converter capacity one times of net side current transformer capacity (about) reduces device and runs junction temperature to improve operational reliability, but mistake
Big Converter Capacity increased system cost, slackened the technology economy advantage of double-fed blower fan；
2) control technology is avoided in synchronous rotational speed operating point, and double-fed blower fan rotor frequency when synchronous rotational speed runs is zero, opens
Close device radiating the most difficult, this technology is avoided synchronous working point using hysteresis characteristic pressure control unit and run, but stagnant ring
Nonlinear characteristic be not only unfavorable for stable operation of unit but also blower fan MPPT maximum power point tracking performance can have been affected；
3) active thermal control technology, this technology by control device change during fan operation switching device loss and
Junction temperature, to improve current transformer operational reliability, has the advantages that easy economy.
Research to current transformer active thermal control technology is a lot of both at home and abroad at present, and its implementation is broadly divided into three kinds:
Pulse width modulation method, can reduce current transformer loss to a certain extent by improving pulse width modulation algorithm, but be subject to harmonic wave
Less with the optimization space that the restriction of power factor performance runs junction temperature to device；
Reactive current adjusts method, reduces the fluctuation of switching device junction temperature by controlling blower fan reactive power size, improves unsteady flow
Device reliability, this method reduces Wind turbines power factor and efficiency, the average junction temperature increasing device operation and highest knot
Warm and regulating effect is limited by the active acceptable operating point of unit；
Switching frequency method is passed through to adjust switching frequency change device switching loss, realizes current transformer junction temperature and controls, reduction is opened
Close frequency and can reduce loss, reduce and run junction temperature, improve current transformer operational reliability, but may increase electromotor pwm harmonic wave and
High frequency speed ripple.
Content of the invention
The purpose of the present invention is exactly to overcome the defect of above-mentioned prior art presence to provide one kind can not affect wind
Improve the double-fed wind energy converter switching frequency of current transformer operational reliability and efficiency on the premise of group of motors other runnability
Control method and system.
The purpose of the present invention can be achieved through the following technical solutions:
1. a kind of control method of double-fed wind energy converter switching frequency, improve double-fed wind energy converter operational reliability with
Efficiency is it is characterised in that comprise the following steps:
1) detect the running speed of double-fed wind power generator；
2) obtain switching frequency optimization characteristics table, and obtain corresponding running speed by looking into switching frequency optimization characteristics table
Rotor-side converter optimizes switching frequency fsw_opt(t)；
3) switching frequency f is optimized according to the rotor-side converter checking insw_opt(t) dynamic regulation pwm pulse period tpwm
(t), and pwm pulse is produced according to pwm pulse duty factor d (t), control rotor-side converter.
Described step 2) in obtain switching frequency optimization characteristics table and specifically include following steps:
21) select generator unit stator electric current pwm harmonic wave ishWith speed ripple pwm component ωrhRefer to as switching frequency optimization
Mark, and determine its limit value；
22) generator speed and switching frequency are set respectively as the horizontal stroke of switching frequency optimization characteristics table, vertical coordinate, progressively
Determine Optimization Work point and draw switching frequency optimization characteristics table.
Described step 21) in determine that limit value has following two methods:
Method one: require to determine that stator current pwm is humorous respectively according to mains by harmonics and shaft system of unit mechanical vibration technology
Ripple limit value ish_maxWith speed ripple pwm component limit value ωrh_max；
Method two: obtain the stator current pwm harmonic wave under electromotor bad working environments and speed ripple pwm component value, will
It is as optimizing index limit value.
Described electromotor bad working environments are nominal switching frequency, maximum speed, fully loaded and greater than encouraging work.
Described step 22) in the determination principle of each Optimization Work point abscissa be:
1) optimization performance and unit allocation stability are considered, Optimization Work point setting more intensive optimization performance is better；
2) because pwm harmonic wave is changed significantly, more Optimization Work point should be set near synchronous rotational speed.
Described step 22) in the determination principle of each Optimization Work point vertical coordinate be:
In each Optimization Work point, reduce rotor-side converter switching frequency and make generator unit stator electric current pwm harmonic wave
ishWith speed ripple pwm component ωrhMeet optimizing index: i simultaneouslysh<ish_maxAnd ωrh<ωrh_max, ish_maxFor stator current
Pwm harmonic limits, ωrh_maxFor speed ripple pwm component limit value.
Described step 3) inclusion step in detail below:
31) modulation algorithm, current transformer DC bus-bar voltage v according to pwm manipulatordcAnd rotor voltage instruction ur *, obtain
Take pwm pulse duty factor d (t)；
32) switching frequency f is optimized according to rotor-side convertersw_optT () obtains pwm pulse period tpwm(t):
tpwm(t)=1/fsw_opt(t)；
33) according to pwm pulse duty factor d (t) and pwm pulse period tpwmT () determines in rotor-side converter controller
Pwm pulse.
Described step 31) in the modulation algorithm of pwm manipulator include sine wave pulse width spwm algorithm and space
Vector pulse width modulation svpwm algorithm.
A kind of control system of double-fed wind energy converter switching frequency, including Wind turbines, gear-box, double-fed generator,
Transformator, electrical network bus, rotor-side converter, net side current transformer and wave filter, described Wind turbines, gear-box, double-fed are sent out
The rotor of motor, rotor-side converter, net side current transformer, wave filter, transformator and electrical network bus are sequentially connected, described double-fed
The stator of electromotor is connected with transformator it is characterised in that this system also includes rotor-side converter controller and pwm modulation
Device, described rotor-side converter controller is connected with rotor-side converter by pwm manipulator.
Compared with prior art, the invention has the advantages that
First, easy to be economical: this method need not increase or change hardware, only Wind turbines control algolithm suitably need to be repaiied
Change and can be achieved with.
2nd, current transformer operational reliability and efficiency are improved: this method passes through suitable reduction near synchronous rotational speed operating point
The method of switching frequency reduces switching device loss and junction temperature, can improve double-fed fan rotor side converter operational reliability simultaneously
With efficiency.
3rd, do not affect other runnabilities of Wind turbines: new method take full advantage of double-fed generator pwm switch harmonic with
The feature that rotor operation frequency declines and reduces, by suitable switching frequency optimal control it is ensured that the electric harmonic wave of unit
Energy, mechanical vibration performance, stable performance are unaffected.Additionally, switching frequency reduces and can also change further with rotor frequency
The impact that nearby current transformer dead band controls to rotor current of kind synchronous rotational speed.
Brief description
Fig. 1 is the system construction drawing of the control system of the present invention.
Fig. 2 is method of the present invention flow chart.
Fig. 3 is the switching frequency Optimizing Flow figure determining Optimization Work point proposed by the present invention.
Fig. 4 is double-fed blower fan MPPT maximum power point tracking performance diagram.
Fig. 5 is switching frequency optimization characteristics figure.
Fig. 6 is double-fed fan motor unit static properties simulation result, wherein dotted line and solid line before and after switching frequency optimal control
It is respectively the result before optimizing and after optimization, (6a) is double-fed fan rotor side converter switching frequency fswSimulation result, (6b)
For double-fed fan rotor side converter stator current pwm harmonic wave ishSimulation result, (6c) turns for double-fed fan rotor side converter
Rapid pulse moves pwm component ωrhSimulation result, (6d) is rotor-side converter igbt and diode junction temperature fluctuation δ tjSimulation result,
(6e) it is rotor-side converter igbt and diode average junction temperature tjmeanSimulation result, (6f) is rotor-side converter igbt and two
Pole pipe is lost plossThe curve of circular labelling is diode for igbt simulation result for simulation result, the wherein curve of square labelling
(diode) simulation result.
Fig. 7 is double-fed fan motor unit Simulation of Dynamic Performance result, wherein dotted line and solid line before and after switching frequency optimal control
It is respectively the result before and after optimizing, in figure (7a) is generator speed ωrSimulation result, (7b) is switching frequency fswEmulation knot
Really, (7c) is igbt junction temperature tj_igbtSimulation result, (7d) is diode junction temperature tj_diodeSimulation result, (7e) becomes for rotor-side
Stream device loss prsc_lossSimulation result.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment:
Method proposed by the present invention belongs to reduction switching frequency method.For overcoming the deficiencies in the prior art, new technique is fully sharp
The feature that declined with rotor operation frequency with double-fed generator pwm switch harmonic and reduce is it is proposed that a kind of new switch frequency
Rate optimizes and control method, under conditions of not affecting running of wind generating set performance (including electromotor harmonic wave, speed ripple etc.),
Effectively reduce the operation junction temperature (including maximum temperature, mean temperature and temperature fluctuation) of rotor-side converter switching device, improve
Current transformer reliability and efficiency.
As shown in figure 1, a kind of control system of double-fed wind energy converter switching frequency, including Wind turbines 1, gear-box 2,
Double-fed generator 3, transformator 4, electrical network bus 5, rotor-side converter 6, net side current transformer 7 and wave filter 8, Wind turbines 1, tooth
Roller box 2, the rotor of double-fed generator 3, rotor-side converter 6, net side current transformer 7, wave filter 8, transformator 4 and electrical network bus 5
It is sequentially connected, the stator of double-fed generator 3 is connected with transformator 4, this system also includes rotor-side converter controller 9 and pwm
Manipulator 10, rotor-side converter controller 9 is connected with rotor-side converter 6 by pwm manipulator 10.
As shown in Fig. 2 a kind of control method of double-fed wind energy converter switching frequency, comprise the following steps:
1) detect the running speed of double-fed wind power generator；
2) obtain switching frequency optimization characteristics table, and obtain corresponding running speed by looking into switching frequency optimization characteristics table
Rotor-side converter optimizes switching frequency fsw_opt(t)；
21) switching frequency optimizing index and limit value are determined.
Choose generator unit stator electric current pwm harmonic wave ishWith speed ripple pwm component ωrhAs switching frequency optimizing index.
The determination of its limit value has two methods: 1) can require to determine respectively according to mains by harmonics and shaft system of unit mechanical vibration technology and determine
Electron current pwm harmonic limits ish_maxWith speed ripple pwm component limit value ωrh_max；2) can be obtained by experiment or emulation and generate electricity
Under machine bad working environments (i.e. nominal switching frequency, maximum speed, fully loaded and greater than encouraging operating point) stator current pwm humorous
Ripple and speed ripple pwm component value, as optimizing index limit value.Wherein method 2) engineering construction of being more convenient for.
22) determine the rotating speed coordinate of Optimization Work point.
Switching frequency optimization characteristics table is made up of multiple discrete Optimization Work points, and its abscissa is generator speed, indulges
Coordinate is to optimize switching frequency, should be spaced certain speed discrepancy to guarantee unit allocation stability between adjacent Optimization Work point.Respectively
The determination principle of Optimization Work point rotating speed coordinate is: 1) considers optimization performance and unit allocation stability.In general, it is excellent
Change operating point setting more intensive optimization performance better, but the control stability of unit may be unfavorable for；2) because pwm harmonic wave changes
Significantly, more Optimization Work point should be set near synchronous rotational speed.According to passing experiment above in principle or can imitate in real system
The rotating speed coordinate of exact fixed each Optimization Work point.
23) determine the optimization switching frequency of Optimization Work point.
As shown in figure 3, for each Optimization Work point, suitably reducing rotor-side converter switching frequency and make electromotor fixed
Electron current pwm harmonic wave ishWith speed ripple pwm component ωrhMeet optimizing index: i simultaneouslysh<ish_maxAnd ωrh<ωrh_max.
3) switching frequency f is optimized according to the rotor-side converter checking insw_opt(t) dynamic regulation pwm pulse period tpwm
(t), and pwm pulse is produced according to pwm pulse duty factor d (t), control rotor-side converter.
In sided rotor side converter controller, each pwm pulse is switched with optimizing by dutycycle d (t) of current time
Frequency fsw_optT () is common to determine.When becoming switching frequency operation, the switch frequency that rotor side controller exports according to optimized switching table
Rate fsw_opt(t) real-time update current pwm pulse period tpwm(t)=1/fswT (), is then calculated with modulation algorithm according to control
Current duty cycle d (t) arriving produces pwm pulse.
Dutycycle depends on modulation algorithm, current transformer DC bus-bar voltage vdcAnd rotor voltage instruction ur *.Typical tune
Algorithm processed includes sine wave pulse width modulated spwm or space vector pulse width modulation svpwm etc., in real system they
Rotor-side converter controller is realized by digital form；DC bus-bar voltage vdcObtained by controller real-time detection；Turn
Sub- voltage instruction by rotor-side converter control algolithm (as vector controlled or direct Power Control etc.) according to real-time detection to
Line voltage ug, stator current is, rotor current ir, rotor position angle θrSignal of change obtains.Taking spwm modulation as a example, currently
Dutycycle d (t) in moment=0.5+0.5m (t), wherein m (t)=2ur *(t)/vdcT () modulates the wink of reference wave for current time
Duration, optimizes switching frequency fsw_optT () is by switching frequency optimization characteristics table according to currently detected generator speed ωr(t)
Table look-up and obtain.
As shown in figure 4, figure is the 2mw double-fed fan motor unit MPPT maximum power point tracking control characteristic curve for emulation.
As shown in Figure 5 and Figure 6, figure is 2mw double-fed fan motor unit static properties emulation knot before and after switching frequency optimal control
Really.From figure (6a)-(6c) it can be seen that before optimizing, rotor-side converter run switch frequency keeps rated value fsw=2000hz
Constant, double-fed generator stator current pwm harmonic wave and speed ripple pwm component are all with rotor frequency f2Reduce and significantly subtract
Little.Make full use of this characteristic, the present invention proposes with stator current pwm harmonic wave and speed ripple pwm component opening as optimizing index
Close frequency optimization method.As shown by the simulation results, the maximum of two optimizing index is both present in electromotor maximum speed and crosses encouraging
Full-load run condition.As limit value, by simulation calculation, can get 2mw double-fed fan rotor side converter as shown in Figure 5
Switching frequency optimization characteristics table.Stator current pwm harmonic wave after optimizing in figure (6a)-(6c) and speed ripple pwm component are
Increase, but and not less than threshold limit value, so that it is guaranteed that after switching frequency optimization double-fed fan motor unit remain to meet system electrical with
The requirement of mechanical movement performance.Scheme the junction temperature of rotor-side converter switching device and loss before and after (6d)-(6f) compared for optimizing
Situation.Simulation result shows, switching frequency Optimized-control Technique proposed by the present invention can effectively reduce device junction temperature and loss, from
And improve current transformer operational reliability and efficiency.Optimal control effect is the most notable near synchronous rotational speed point, and wherein igbt ties
Temperature fluctuation and average junction temperature have dropped about 10 DEG C and 30 DEG C respectively, and minimizing about 45% is lost.Under the junction temperature of diode and loss
Fall is similar to igbt.
As shown in fig. 7, figure is double-fed fan motor unit Simulation of Dynamic Performance result before and after switching frequency optimal control.Wherein thick
Solid line is result after switching frequency optimizes, and fine dotted line is result before switching frequency optimizes.Simulate in emulation wind speed unexpected under
The dynamic operating condition of fall.For realize maximal power tracing run, generator speed characteristic curve as shown in Figure 4 gradually under
Fall.Simulation result shows: under switching frequency optimal control, system can dynamic stability be run and switching device junction temperature and loss
Significantly reduce.
Claims (8)
1. a kind of control method of double-fed wind energy converter switching frequency, improves double-fed wind energy converter operational reliability and effect
Rate is it is characterised in that comprise the following steps:
1) detect the running speed of double-fed wind power generator；
2) obtain switching frequency optimization characteristics table, and obtain the rotor of corresponding running speed by looking into switching frequency optimization characteristics table
Side converter optimizes switching frequency fsw_opt(t), described step 2) in obtain switching frequency optimization characteristics table specifically include following
Step:
21) select generator unit stator electric current pwm harmonic wave ishWith speed ripple pwm component ωrhAs switching frequency optimizing index, and
Determine its limit value；
22) set generator speed and switching frequency respectively as the horizontal stroke of switching frequency optimization characteristics table, vertical coordinate, progressively determine
Optimization Work point simultaneously draws switching frequency optimization characteristics table；
3) switching frequency f is optimized according to the rotor-side converter checking insw_opt(t) dynamic regulation pwm pulse period tpwm(t), and
Pwm pulse is produced according to pwm pulse duty factor d (t), controls rotor-side converter.
2. a kind of control method of double-fed wind energy converter switching frequency according to claim 1 is it is characterised in that described
Step 21) in determine that limit value has following two methods:
Method one: require to determine stator current pwm harmonic wave limit respectively according to mains by harmonics and shaft system of unit mechanical vibration technology
Value ish_maxWith speed ripple pwm component limit value ωrh_max；
Method two: obtain the stator current pwm harmonic wave under electromotor bad working environments and speed ripple pwm component value, made
For optimizing index limit value.
3. a kind of control method of double-fed wind energy converter switching frequency according to claim 2 is it is characterised in that described
Electromotor bad working environments be nominal switching frequency, maximum speed, fully loaded and greater than encouraging work.
4. a kind of control method of double-fed wind energy converter switching frequency according to claim 1 is it is characterised in that described
Step 22) in the determination principle of each Optimization Work point abscissa be:
1) optimization performance and unit allocation stability are considered, Optimization Work point setting more intensive optimization performance is better；
2) because pwm harmonic wave is changed significantly, more Optimization Work point should be set near synchronous rotational speed.
5. a kind of control method of double-fed wind energy converter switching frequency according to claim 1 is it is characterised in that described
Step 22) in the determination principle of each Optimization Work point vertical coordinate be:
In each Optimization Work point, reduce rotor-side converter switching frequency and make generator unit stator electric current pwm harmonic wave ishWith
Speed ripple pwm component ωrhMeet optimizing index: i simultaneouslysh<ish_maxAnd ωrh<ωrh_max, ish_maxHumorous for stator current pwm
Ripple limit value, ωrh_maxFor speed ripple pwm component limit value.
6. a kind of control method of double-fed wind energy converter switching frequency according to claim 1 is it is characterised in that described
Step 3) include step in detail below:
31) modulation algorithm, current transformer DC bus-bar voltage v according to pwm manipulatordcAnd rotor voltage instruction ur *, obtain pwm
Pulse duty factor d (t)；
32) switching frequency f is optimized according to rotor-side convertersw_optT () obtains pwm pulse period tpwm(t):
tpwm(t)=1/fsw_opt(t)；
33) according to pwm pulse duty factor d (t) and pwm pulse period tpwmT () determines the pwm in rotor-side converter controller
Pulse.
7. a kind of control method of double-fed wind energy converter switching frequency according to claim 6 is it is characterised in that described
Step 31) in the modulation algorithm of pwm manipulator include sine wave pulse width spwm algorithm and space vector pulse duration
Modulation svpwm algorithm.
8. a kind of control of the control method of double-fed wind energy converter switching frequency realized as described in any one of claim 1-7
System, including Wind turbines (1), gear-box (2), double-fed generator (3), transformator (4), electrical network bus (5), rotor-side unsteady flow
Device (6), net side current transformer (7) and wave filter (8), described Wind turbines (1), gear-box (2), the turning of double-fed generator (3)
Son, rotor-side converter (6), net side current transformer (7), wave filter (8), transformator (4) and electrical network bus (5) are sequentially connected, institute
The stator of double-fed generator (3) stated is connected it is characterised in that this system also includes rotor-side converter control with transformator (4)
Device (9) processed and pwm manipulator (10), described rotor-side converter controller (9) is passed through pwm manipulator (10) and is become with rotor-side
Stream device (6) connects.
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| CN109050859B (en) * | 2018-06-12 | 2020-06-26 | 同济大学 | Double-fed ship hybrid shaft motor independent propulsion system and control method thereof |
| CN109240195B (en) * | 2018-10-19 | 2021-06-01 | 江苏方天电力技术有限公司 | Control method and control system for cooling system of oil-immersed converter transformer |
| US10742149B1 (en) * | 2019-04-22 | 2020-08-11 | General Electric Company | System and method for reactive power control of a wind turbine by varying switching frequency of rotor side converter |
| CN112803790B (en) * | 2019-11-13 | 2024-07-09 | 北京金风科创风电设备有限公司 | Control method and controller of converter |
| CN110932322B (en) * | 2019-12-13 | 2023-02-07 | 中国船舶重工集团海装风电股份有限公司 | Torque ripple optimization design method for wind generating set |
| CN112701949B (en) * | 2020-12-21 | 2022-09-13 | 阳光电源股份有限公司 | Double-fed power generation system, three-level converter and control method thereof |
| CN114256857B (en) * | 2021-12-07 | 2024-03-26 | 国网河南省电力公司电力科学研究院 | Control method and system for improving frequency modulation capability of doubly-fed wind turbine generator |
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| CN102097826B (en) * | 2011-02-25 | 2013-01-30 | 南京航空航天大学 | Doubly salient electromagnetic wind power generation system structure and control method |
| CN102790515B (en) * | 2012-08-23 | 2015-05-13 | 南京国电南自风电自动化技术有限公司 | Control method of wind power generation double-feed converter space vector pulse width modulation (SVPWM) based on variable switching frequency |
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2015
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