CN108306272A - Wind generator system common-mode voltage suppressing method - Google Patents
Wind generator system common-mode voltage suppressing method Download PDFInfo
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- CN108306272A CN108306272A CN201810058916.0A CN201810058916A CN108306272A CN 108306272 A CN108306272 A CN 108306272A CN 201810058916 A CN201810058916 A CN 201810058916A CN 108306272 A CN108306272 A CN 108306272A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 12
- 230000033228 biological regulation Effects 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009977 dual effect Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- H02J3/386—
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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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- Control Of Eletrric Generators (AREA)
Abstract
The present invention relates to a kind of wind generator system common-mode voltage suppressing methods, the stator winding of generator is connected to power grid through transformer, the AC energy that frequency changes is transformed to direct current energy by rotor windings by generator-side converter wear MSC, it is transformed to the AC energy of fixed frequency using net side current transformer GSC direct current energies, power grid is connected to through transformer；By controlling power inverter regulation motor rotor current, under conditions of realizing motor speed variation, the constant electric energy of motor output frequency；Two PWM modules in MSC and GSC controls, it is given according to voltage, select space vector of voltage, generate the power switch signal of current transformer, on the basis of existing current transformer PWM module, pusher side and net side current transformer voltage space vector modulation consider, and coordinate selection Zero voltage vector and are modulated, effectively reduce system common-mode voltage.Method is simple and practicable, effective, economical and practical.
Description
Technical field
The present invention relates to a kind of electric machines control technology, more particularly to a kind of wind generator system common-mode voltage suppressing method.
Background technology
MW class wind turbine and converter system, because leading to the common mode electricity of system using voltage PWM (PWM)
Pressure is high, causes excessively high shaft current, be easy to cause bearing galvano-cautery damage；Excessively high can also insulate to machine winding of common-mode voltage is made
At damage, machine winding insulation life and crash rate are influenced.Common-mode voltage is excessively high may also to cause electrical system electromagnetic interference
(EMI) and the problem of electromagnetic compatibility (EMC)；If there is the circulation of a large amount of zero-sequence currents can also cause unnecessary system zero-sequence current
Loss.
Invention content
The present invention be directed to MW class wind turbines to use the problem that voltage PWM causes system common-mode voltage high,
A kind of wind generator system common-mode voltage suppressing method is proposed, by changing control method, reduces MW class wind turbine
Extend the insulation of machine winding with the common-mode voltage of converter system to substantially reduce the generation of dynamo bearing galvano-cautery
Service life reduces the harm of system electromagnetic interference, meets electromagnetic compatibility standard requirement.The present invention is from the excessively high root of common-mode voltage
Source is set out, and is used for suppression system common-mode voltage by changing PWM controls, practical application effect is apparent.
The technical scheme is that：A kind of wind generator system common-mode voltage suppressing method, the stator winding of generator
It is connected to power grid through transformer, the AC energy that frequency changes is transformed to direct current by rotor windings by generator-side converter wear MSC
Can, DC voltage UDC, the AC energy of fixed frequency is transformed to using net side current transformer GSC direct current energies, through transformer
It is connected to power grid；By controlling power inverter regulation motor rotor current, under conditions of realizing motor speed variation, motor is defeated
Go out the electric energy of frequency-invariant；Two PWM modules during generator-side converter wear MSC and net side current transformer GSC is controlled, it is given according to voltage,
Space vector of voltage is selected, generates the power switch signal of current transformer, generator-side converter wear PWM module will export next cycle
Voltage vector information be transmitted to the PWM module of net side current transformer, net side current transformer PWM module also will export next cycle
Voltage vector information be transmitted to the PWM module of generator-side converter wear, when any one current transformer needs to export Zero voltage vector,
According to following table with minimum common-mode voltage UNGZero voltage vector V0 or V7 output is selected for principle, reduces system common-mode voltage,
The beneficial effects of the present invention are：Wind generator system common-mode voltage suppressing method of the present invention so that high frequency common mode
The amplitude of voltage substantially reduces；The shaft current to circulate by parasitic capacitance substantially reduces；The galvano-cautery phenomenon of bearing greatly reduces；
The insulation life of machine winding extends, and avoids premature failure；System electromagnetic radiation reduces, and Electro Magnetic Compatibility improves；Do not change
Become hardware configuration, software modification is easily achieved at low cost；Current transformer voltage output characteristics will not change.It is simple and practicable, row to have
Effect, it is economical and practical, to improving the reliability of Wind turbines, maintenance cost is reduced, there is prodigious economic value and foreground.
Description of the drawings
Fig. 1 is dual feed wind asynchronous generator control system architecture figure；
Fig. 2 is dual feed wind asynchronous generator control system schematic diagram；
Fig. 3 is space vector of voltage figure；
Fig. 4 is current transformer output voltage and common-mode voltage schematic diagram；
Fig. 5 a are common-mode voltage oscillogram before the present invention program is implemented；
Fig. 5 b are common-mode voltage oscillogram after the present invention program is implemented；
Fig. 6 a are common-mode voltage spectrogram before the present invention program is implemented；
Fig. 6 b are common-mode voltage spectrogram after the present invention program is implemented；
Fig. 7 is dual feed wind asynchronous generator control system schematic diagram of the present invention.
Specific implementation mode
Dual feed wind asynchronous generator control system architecture figure as shown in Figure 1, Wind turbines capture wind energy by blade and turn
The mechanical energy for turning to rotation is transmitted to a three-phase double-fed asynchronous generator after gear-box (Gear box) speed change
(DFIG).Stator (Stator) winding of motor is connected to power grid (Grid), rotor through transformer (Transformer)
(Rotor) winding is converted by the AC energy that generator-side converter wear (Machine-side converter, MSC) changes frequency
For direct current energy, direct current energy is transformed to fixed frequency using net side current transformer (Grid-sideconverter, GSC)
AC energy is connected to power grid (Grid) through transformer (Transformer).By controlling power inverter regulation motor rotor
Electric current, under conditions of realizing motor speed variation, the constant electric energy of motor output frequency.Fig. 2 show typical double-fed asynchronous
The effect of the schematic diagram of generator wind-driven power generation control system, wherein PWM module is given according to voltage, selects voltage appropriate
Space vector generates the power switch signal of current transformer.The generator-side converter wear MSC and net side current transformer GSC two in the control of Fig. 2
A PWM module is mutual indepedent, the output voltage that respectively realization requires, not interrelated in control.
Fig. 3 and Fig. 4 is space vector of voltage figure and current transformer output voltage and common-mode voltage schematic diagram.Generator-side converter wear is defeated
It is abc to enter three, and it is ABC that generator-side converter wear, which exports three, and it is U that generator-side converter wear, which exports DC voltage,DC, 1/2UDCPlace is o points,
UNGFor system common-mode voltage, UNOFor generator-side converter wear common-mode voltage, UGOIt, can be with by analysis for net side current transformer common-mode voltage
Obtain single current transformer output common mode voltage relationship under different Vector Modulations as shown in table 1, it is single under the effect of different voltages vector
The output common mode voltage value of current transformer is UNOOr UGO.When two current transformers (generator-side converter wear and net side current transformer) work at the same time
When, system common-mode voltage can be by formula UNG=UNO-UGOIt is derived from two converter systems under different Vector Modulations as shown in table 2
Common-mode voltage relationship.
Table 1
Table 2
In order to reduce system common-mode voltage, the present invention proposes that two PWM modules are mutually related new method, according to table 2 from
System integrally considers appropriately to select current transformer Zero voltage vector, to realize that system common-mode voltage is greatly reduced.In existing unsteady flow
On the basis of device PWM module, pusher side and net side current transformer voltage space vector modulation consider, and coordinate selection Zero voltage vector
It is modulated, effectively reduces system common-mode voltage.
Dual feed wind asynchronous generator control system schematic diagram of the present invention as shown in Figure 7, two PWM module connecting communications,
On the basis of existing current transformer PWM module, pusher side and net side current transformer voltage space vector modulation consider, pusher side unsteady flow
The voltage vector information that next cycle to be exported is transmitted to the PWM module of net side current transformer, net side current transformer by device PWM module
The voltage vector information that next cycle to be exported also is transmitted to the PWM module of generator-side converter wear by PWM module, coordinates selection zero
Voltage vector, which is modulated, effectively reduces system common-mode voltage.I.e. when any one current transformer needs to export Zero voltage vector,
It selects Zero voltage vector (V0 or V7) to export by principle of minimum common-mode voltage according to table 2, system common-mode voltage can be reduced.
Such as net side current transformer is exporting nonzero voltage space vector V1, generator-side converter wear needs to export Zero voltage vector at this time
For V7, in order to reduce common-mode voltage, generator-side converter wear output adjustment is that Zero voltage vector V0 substitutes Zero voltage vector V7 at this time, this
Sample common-mode voltage amplitude is by 2/3UDCIt is reduced to 1/3UDC。
Such as net side current transformer is exporting Zero voltage vector V0, at this time generator-side converter wear need export Zero voltage vector be
V7, in order to reduce common-mode voltage, generator-side converter wear output adjustment is that Zero voltage vector V7 substitutes Zero voltage vector V0 at this time, in this way
Common-mode voltage amplitude is by UDCIt is reduced to 0.
Because two Zero voltage vector V0 are consistent to output voltage effect with V7, thus only Zero voltage vector is replaced in adjustment,
Current transformer voltage output characteristics will not change.
Fig. 5 a 5b and Fig. 6 a 6b compared system common-mode voltage implement the present invention before and after time domain and frequency domain effect.It can see
After going out the present invention program implementation, system high-frequency common-mode voltage amplitude effectively reduces.
The present embodiment illustrates by taking double-fed asynchronous generator wind generator system as an example, but be described herein be not limited to it is any
Specific wind generator system.The PWM generates control module modification, suitable for any motor and current transformer control strategy
It is not influenced using the improvement or deformation that PWM generation module, carry out other parts control strategy on the basis of the above embodiments
The implementation of the present invention and scope of the claims.
Claims (1)
1. a kind of wind generator system common-mode voltage suppressing method, the stator winding of generator are connected to power grid through transformer, turn
The AC energy that frequency changes is transformed to direct current energy, DC voltage U by sub- winding by generator-side converter wear MSCDC, using
Net side current transformer GSC direct current energies are transformed to the AC energy of fixed frequency, and power grid is connected to through transformer；By controlling power
Converter regulation motor rotor current, under conditions of realizing motor speed variation, the constant electric energy of motor output frequency；Pusher side becomes
Two PWM modules in device MSC and net side current transformer GSC controls are flowed, it is given according to voltage, space vector of voltage is selected, generates and becomes
Flow the power switch signal of device, which is characterized in that the generator-side converter wear PWM module voltage vector to be exported next cycle is believed
Breath is transmitted to the PWM module of net side current transformer, and the net side current transformer PWM module voltage vector also to be exported next cycle is believed
Breath is transmitted to the PWM module of generator-side converter wear, when any one current transformer needs to export Zero voltage vector, according to following table with most
Small common-mode voltage UNGZero voltage vector V0 or V7 output is selected for principle, reduces system common-mode voltage,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058916.0A CN108306272B (en) | 2018-01-22 | 2018-01-22 | Wind generator system common-mode voltage suppressing method |
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|---|---|---|---|
| CN201810058916.0A CN108306272B (en) | 2018-01-22 | 2018-01-22 | Wind generator system common-mode voltage suppressing method |
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| CN108306272A true CN108306272A (en) | 2018-07-20 |
| CN108306272B CN108306272B (en) | 2019-04-02 |
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|---|---|---|---|---|
| CN1983785A (en) * | 2005-12-15 | 2007-06-20 | 中国科学院电工研究所 | Controller of exciting power-supply net sided converter for double-feedback speed-variable frequency-constant wind-driven generator |
| US20080049460A1 (en) * | 2006-08-22 | 2008-02-28 | Regents Of The University Of Minnesota | Open-ended control circuit for electrical apparatus |
| CN101771359A (en) * | 2010-02-09 | 2010-07-07 | 中国石油大学(华东) | Three-phase voltage type PWM converter capable of reducing output common-mode voltage and modulation method thereof |
| CN102882459A (en) * | 2012-10-22 | 2013-01-16 | 东南大学 | Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles |
| CN102931685A (en) * | 2012-11-19 | 2013-02-13 | 新疆金风科技股份有限公司 | Converter device used for wind generator system |
| CN104601001A (en) * | 2014-12-25 | 2015-05-06 | 北京天诚同创电气有限公司 | Current conversion device and current conversion system for wind generating set |
| US20150180273A1 (en) * | 2013-12-23 | 2015-06-25 | General Electric Company | Optimized filter for battery energy storage on alternate energy systems |
| CN105356805A (en) * | 2015-10-28 | 2016-02-24 | 合肥工业大学 | Permanent magnet synchronous motor model prediction common-mode voltage inhibition method |
-
2018
- 2018-01-22 CN CN201810058916.0A patent/CN108306272B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1983785A (en) * | 2005-12-15 | 2007-06-20 | 中国科学院电工研究所 | Controller of exciting power-supply net sided converter for double-feedback speed-variable frequency-constant wind-driven generator |
| US20080049460A1 (en) * | 2006-08-22 | 2008-02-28 | Regents Of The University Of Minnesota | Open-ended control circuit for electrical apparatus |
| CN101771359A (en) * | 2010-02-09 | 2010-07-07 | 中国石油大学(华东) | Three-phase voltage type PWM converter capable of reducing output common-mode voltage and modulation method thereof |
| CN102882459A (en) * | 2012-10-22 | 2013-01-16 | 东南大学 | Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles |
| CN102931685A (en) * | 2012-11-19 | 2013-02-13 | 新疆金风科技股份有限公司 | Converter device used for wind generator system |
| US20150180273A1 (en) * | 2013-12-23 | 2015-06-25 | General Electric Company | Optimized filter for battery energy storage on alternate energy systems |
| CN104601001A (en) * | 2014-12-25 | 2015-05-06 | 北京天诚同创电气有限公司 | Current conversion device and current conversion system for wind generating set |
| CN105356805A (en) * | 2015-10-28 | 2016-02-24 | 合肥工业大学 | Permanent magnet synchronous motor model prediction common-mode voltage inhibition method |
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