CN108306272B - Wind generator system common-mode voltage suppressing method - Google Patents
Wind generator system common-mode voltage suppressing method Download PDFInfo
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- CN108306272B CN108306272B CN201810058916.0A CN201810058916A CN108306272B CN 108306272 B CN108306272 B CN 108306272B CN 201810058916 A CN201810058916 A CN 201810058916A CN 108306272 B CN108306272 B CN 108306272B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000013598 vector Substances 0.000 claims abstract description 40
- 238000004804 winding Methods 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 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
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect 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
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 generator-side converter wear MSC by rotor windings, it is transformed to the AC energy of fixed frequency using grid-side converter GSC direct current energy, is connected to power grid through transformer；Rotor electric current is adjusted by control power inverter, under conditions of realizing motor speed change, the constant electric energy of motor output frequency；Two PWM modules in MSC and GSC control, 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 grid-side converter voltage space vector modulation comprehensively consider, and coordinate selection Zero voltage vector and are modulated, system common-mode voltage is effectively reduced.Method is simple and easy, effective, economical and practical.
Description
Technical field
The present invention relates to a kind of electric machines control technology, in particular to a kind of wind generator system common-mode voltage suppressing method.
Background technique
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, and bearing galvano-cautery is be easy to cause to 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.
Summary of the invention
The present invention be directed to MW class wind turbines to use the voltage PWM problem that 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 to substantially reduce the generation of generator bearing galvano-cautery with the common-mode voltage of converter system
Service life reduces the harm of system electromagnetic interference, meets electromagnetic compatibility standard requirement.The present invention root excessively high from common-mode voltage
Source is set out, and by changing PWM control for inhibiting system common-mode voltage, practical application effect is obvious.
The technical solution of the present invention is as follows: 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 generator-side converter wear MSC by rotor windings
Can, DC voltage UDC, the AC energy of fixed frequency is transformed to using grid-side converter GSC direct current energy, through transformer
It is connected to power grid；Rotor electric current is adjusted by control power inverter, under conditions of realizing motor speed change, motor is defeated
The electric energy of frequency-invariant out；Two PWM modules in generator-side converter wear MSC and grid-side converter GSC control, 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 grid-side converter, grid-side converter 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 are 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；It is substantially reduced by the shaft current that parasitic capacitance circulates；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 easy, row to have
Effect, it is economical and practical, to the reliability for improving Wind turbines, maintenance cost is reduced, there is very big economic value and prospect.
Detailed description of the invention
Fig. 1 is dual feed wind asynchronous generator control system architecture figure；
Fig. 2 is dual feed wind asynchronous generating machine 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 is common-mode voltage waveform diagram before the present invention program is implemented；
Fig. 5 b is common-mode voltage waveform diagram after the present invention program is implemented；
Fig. 6 a is common-mode voltage spectrogram before the present invention program is implemented；
Fig. 6 b is common-mode voltage spectrogram after the present invention program is implemented；
Fig. 7 is dual feed wind asynchronous generating machine control system schematic diagram of the present invention.
Specific embodiment
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 grid-side converter (Grid-sideconverter, GSC)
AC energy is connected to power grid (Grid) through transformer (Transformer).Rotor is adjusted by control power inverter
Electric current, under conditions of realizing motor speed change, the constant electric energy of motor output frequency.Fig. 2 show typical double-fed asynchronous
The schematic diagram of generator wind-driven power generation control system, wherein the effect of 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 grid-side converter GSC two in the control of Fig. 2
A PWM module is mutually 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
Enter three for abc, 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 point,
UNGFor system common-mode voltage, UNOFor generator-side converter wear common-mode voltage, UGOIt, can be with by analysis for grid-side converter 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 grid-side converter) 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 grid-side converter voltage space vector modulation comprehensively consider, and coordinate selection Zero voltage vector
It is modulated, system common-mode voltage is effectively reduced.
Dual feed wind asynchronous generating machine 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 grid-side converter voltage space vector modulation comprehensively consider, pusher side unsteady flow
The voltage vector information that next cycle to be exported is transmitted to the PWM module of grid-side converter, grid-side converter 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, is effectively reduced system common-mode voltage.I.e. when any one current transformer needs to export Zero voltage vector,
Zero voltage vector (V0 or V7) output is selected by principle of minimum common-mode voltage according to table 2, system common-mode voltage can be reduced.
Such as grid-side converter 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 grid-side converter is exporting Zero voltage vector V0, generator-side converter wear needs to export Zero voltage vector and is at this time
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 adjustment replacement Zero voltage vector,
Current transformer voltage output characteristics will not change.
Fig. 5 a 5b and Fig. 6 a 6b compared system common-mode voltage and implement present invention front and back time domain and frequency domain effect.It can see
After the present invention program is implemented out, system high-frequency common-mode voltage amplitude is effectively reduced.
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
Using PWM generation module is arrived, the improvement or deformation for carrying out other parts control strategy on the basis of the above embodiments do not influence
Implementation and scope of protection of the claims of the invention.
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 by generator-side converter wear MSC by sub- winding, using grid-side converter GSC
Direct current energy is transformed to the AC energy of fixed frequency, is connected to power grid through transformer；Electricity is adjusted by control power inverter
Machine rotor electric current, under conditions of realizing motor speed change, the constant electric energy of motor output frequency；Generator-side converter wear MSC and net
Two PWM modules in side current transformer GSC control, it is given according to voltage, space vector of voltage is selected, the power for generating current transformer is opened
OFF signal, which is characterized in that the voltage vector information that next cycle to be exported is transmitted to net side by generator-side converter wear PWM module
The voltage vector information that next cycle to be exported also is transmitted to pusher side by the PWM module of current transformer, grid-side converter PWM module
The PWM module of current transformer, when any one current transformer needs to export Zero voltage vector, according to following table with minimum common-mode voltage UNG
Zero voltage vector V0 or V7 output are selected for principle, reduces system common-mode voltage, wherein UDCDirect current is exported for generator-side converter wear
Pressure；V1, V2, V3, V4, V5, V6 are respectively corresponding 6 nonzero voltage space vectors in space vector of voltage,
。
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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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|---|---|---|---|
| CN201810058916.0A CN108306272B (en) | 2018-01-22 | 2018-01-22 | Wind generator system common-mode voltage suppressing method |
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| CN108306272A CN108306272A (en) | 2018-07-20 |
| CN108306272B true CN108306272B (en) | 2019-04-02 |
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Citations (6)
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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 |
| 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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8169179B2 (en) * | 2006-08-22 | 2012-05-01 | Regents Of The University Of Minnesota | Open-ended control circuit for electrical apparatus |
| US9337685B2 (en) * | 2013-12-23 | 2016-05-10 | General Electric Company | Optimized filter for battery energy storage on alternate energy systems |
-
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- 2018-01-22 CN CN201810058916.0A patent/CN108306272B/en active Active
Patent Citations (6)
| 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 |
| 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 |
| 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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