CN101860040B - Rotor-side converter of double-fed wind generating set for low voltage ride through and rapid restarting method thereof - Google Patents
Rotor-side converter of double-fed wind generating set for low voltage ride through and rapid restarting method thereof Download PDFInfo
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- CN101860040B CN101860040B CN2010101707948A CN201010170794A CN101860040B CN 101860040 B CN101860040 B CN 101860040B CN 2010101707948 A CN2010101707948 A CN 2010101707948A CN 201010170794 A CN201010170794 A CN 201010170794A CN 101860040 B CN101860040 B CN 101860040B
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Abstract
The invention relates to a rotor-side converter of a double-fed wind generating set for low voltage ride through and a rapid restarting method thereof. The technical scheme adopted by the invention is that by detecting a rotor port voltage of the rotor-side converter of the double-fed wind generating set, in the low voltage ride through process of the converter, an instantaneous value of the rotor port voltage detected before the rotor-side converter is restarted is used as a feedforward compensation term output by a rotor current regulator when the rotor-side converter is restarted so as to counteract the influence of an induced electromotive force of a rotor on the rotor-side converter when the rotor-side converter is restarted. The rotor-side converter of the invention avoids secondary overcurrent of the rotor of the double-fed wind generating set, improves rapid control capability of the rotor-side converter and strengthens the low voltage ride through capability of the double-fed wind generating set.
Description
Technical field
The present invention relates to wind power generation field, be specifically related to a kind of low-voltage pass through during the rotor-side converter of double-fed wind generating set rapid restarting method.
Background technology
Along with the fast development of wind-power market, it is increasing that wind power generation accounts for the proportion of global gross generation, and the stability and the reliability of wind power generation more and more come into one's own.The countries in the world grid company has also one after the other been put into effect strict wind energy turbine set and has been inserted the electric power network technique regulation; Comprise the electric network fault ride-through capability, when promptly of short duration falling appearred in electrical network, blower fan can keep being incorporated into the power networks; Even certain reactive power is provided to electrical network; Support power system restoration, normal up to power system restoration, thus " passing through " this low-voltage time.
Because the stator side of double-feedback aerogenerator group directly connects electrical network, this direct coupling makes the landing of line voltage directly be reflected on the generator unit stator terminal voltage, causes stator magnetic linkage DC component to occur, also negative sequence component can occur during unbalanced fault.The DC component of stator magnetic linkage and negative sequence component can form bigger slip with respect to the generator amature with the higher rotation speed running, and (slip frequency is respectively at ω
sWith 2 ω
sNear, ω
sBe the synchro angle frequency), thus induce bigger induced electromotive force and produce bigger rotor current, cause that voltage and current significantly increases in the rotor loop.Simultaneously, when the line voltage rapid drawdown, the double-feedback type wind generator set stator winding sends not suddenling change of power and can cause stator side to produce very big fault current.Because the close coupling between rotor winding and the stator winding, the stator current that increases fast can further cause the overvoltage and the overcurrent of rotor loop.And big electric current can cause that generator core is saturated, reactance reduces, and the actual rotor electric current also will further increase.In addition; Because the wind energy conversion system governing speed is slower, the wind energy of fault wind energy conversion system in early stage absorption can obviously not reduce, and generating set is because the stator terminal voltage reduction; Can not be normally to the electrical network transmission of electric energy; Be that some energy is delivered to electrical network by the grid side current transformer, and another part energy can't be imported electrical network, these energy will cause dc bus capacitor quick charge, direct voltage to raise rapidly.Because of electrical network falls the safe operation of the transient process meeting serious threat of the double-feedback aerogenerator group electromagnetic response that causes to double-feedback aerogenerator group rotor current transformer.
For during electric network fault, the protection rotor-side converter makes the double-feedback aerogenerator group have low voltage ride-through capability at present, and commercial MW level double-feedback aerogenerator group mostly is equipped with active crowbar circuit.Electrical network breaks down when causing the rotor overcurrent; Fundamental method is with the rotor-side converter of double-fed wind generating set locking time; The rotor winding is inserted in active crow bar loop carry out current limliting; Treat that the rotor winding current drops to certain value and breaks off active crowbar circuit when following, open rotor-side converter once more to realize that double-feedback aerogenerator group electric network fault stator side down is from netting controlled operation.Yet because stator does not leave net, and the double-feedback aerogenerator group rotor has the existence of big induced electromotive force, the rotor voltage equation of double-feedback aerogenerator group can be expressed as under the synchronous rotating frame of stator voltage vector oriented during the electric network fault:
The rotor port voltage is made up of resistance drop, arteries and veins power transformation kinetic potential and revolving electro-motive force.During the low-voltage because the existence of double-feedback aerogenerator group transient process; Cause the arteries and veins power transformation kinetic potential and the revolving electro-motive force part of rotor port voltage bigger than normal and difficult, therefore when the active crowbar circuit of disconnection is opened rotor-side converter once more, may cause that bigger impulse current causes double-feedback aerogenerator group rotor secondary overcurrent through calculating.
Summary of the invention
The present invention is directed to the deficiency of prior art, designed and developed out a kind of double-feedback aerogenerator group rotor secondary overcurrent of avoiding occurring, improve the quick control performance of rotor-side converter, strengthen the method for the low voltage ride-through capability of double-feedback aerogenerator group.
The present invention realizes through following technical scheme:
A kind of low-voltage is passed through and is used rotor-side converter of double-fed wind generating set, and rotor port voltage check device is installed in the rotor-side converter, and rotor port voltage check device is electrically connected with rotor-side converter.
Low-voltage is passed through the rapid restarting method with rotor-side converter of double-fed wind generating set:
(1) before rotor-side converter is restarted, detect the rotor port voltage of double-fed type asynchronous generator,
And with detected value through coordinate transform, obtain the rotor port instantaneous voltage
of dq rotating coordinate system lower rotor part side converter before restarting
(2) ignore stator resistance, through formula i
Rdq_ref=U
Sdq/ (j ω
s* L
m) approximate calculation goes out under the current line voltage to realize the synchronous needed rotor current instruction i of double-fed type asynchronous generating machine rotor
Rdq_ref, U wherein
SdqBe current line voltage, L
mBe mutual inductance between stator and rotor winding, ω
sBe mains frequency;
(3) through rotor current closed-loop control network rotor current is carried out tracking Control, realize that rotor is synchronous fast; Step (2) is gone on foot the i that calculates
Rdq_refInput as the rotor current adjuster is given, the actual rotor current i
RdqAs the input feedback of rotor current adjuster, the rotor port instantaneous voltage that simultaneously step (1) is obtained
Feedforward compensation item as the output of rotor current adjuster;
(4) with the output u of rotor current closed-loop control network
Rdq_refThrough coordinate transform, obtain the input u of space voltage vector generating module
R α β _ refThereby, produce the pwm signal that is used to drive the rotor-side power model.
(5) treat rotor current i
RdqFollow the tracks of the rotor current instruction i that rotor needs synchronously fully
Rdq_refThe time, recovering control to the active power and the reactive power of double-fed type asynchronous generator, rotor-side converter restarted during completion double-feedback aerogenerator group low-voltage was passed through.
The present invention increases the checkout gear that is used for the detection rotor port voltage in rotor-side converter; During the current transformer low-voltage is passed through; The feedforward compensation item of rotor current adjuster output when detected rotor port instantaneous voltage was restarted as rotor-side converter before rotor-side converter restarted, with offset rotor-side converter when restarting the rotor induction kinetic potential to the influence of rotor-side converter.
The control method that adopts the present invention to propose; During the current transformer low-voltage is passed through; The feedforward compensation item of rotor current adjuster output when detected rotor port instantaneous voltage is restarted as rotor-side converter before restarting with rotor-side converter; The rotor induction kinetic potential is to the influence of rotor-side converter when restarting with the counteracting rotor-side converter; Avoid occurring double-feedback aerogenerator group rotor secondary overcurrent, improved the quick control performance of rotor-side converter, strengthened the low voltage ride-through capability of double-feedback aerogenerator group.
Description of drawings
Accompanying drawing is rotor-side converter of double-fed wind generating set rotor current control block diagram
Embodiment
Shown in accompanying drawing.
Low voltage failure of electric network generally has electric network electric voltage drop stage, electrical network low voltage stage, line voltage to recover stage, the normal four-stage of line voltage.Recover two stages at electric network electric voltage drop and line voltage, the double-feedback aerogenerator group can induce bigger rotor motor-driven gesture and produce bigger rotor current, causes that voltage and current significantly increases in the rotor circuit.In order to protect rotor-side converter, realize that the low-voltage of double-feedback aerogenerator group is passed through, need carry out locking to rotor-side converter in these two stages usually, drop into active crow bar simultaneously and carry out energy and release.Simultaneously in order to realize that electrical network low voltage stage and line voltage recover the control of stage to the double-feedback aerogenerator group; Send active power and the recovery of reactive power to electrical network with the support electrical network; Treating needs the active crow bar of disconnection that rotor-side converter is restarted fast after rotor current drops to certain value, recovers the control to the active power and the reactive power of double-feedback aerogenerator group.
The technical scheme that the present invention adopts is through detecting rotor-side converter of double-fed wind generating set rotor port voltage; During the current transformer low-voltage is passed through; The feedforward compensation item of rotor current adjuster output when detected rotor port instantaneous voltage was restarted as rotor-side converter before rotor-side converter restarted, with offset rotor-side converter when restarting the rotor induction kinetic potential to the influence of rotor-side converter.Rotor port voltage check device is installed in the rotor-side converter, and rotor port voltage check device is electrically connected with rotor-side converter.Concrete rotor-side converter rapid restarting method step is following:
(1) before rotor-side converter is restarted; Detect the rotor port voltage of double-fed type asynchronous generator; And with detected value through coordinate transform, obtain the rotor port instantaneous voltage
of dq rotating coordinate system lower rotor part side converter before restarting
(2) ignore stator resistance, through formula i
Rdq_ref=U
Sdq/ (j ω
s* L
m) approximate calculation goes out under the current line voltage to realize the synchronous needed rotor current instruction i of double-fed type asynchronous generating machine rotor
Rdq_ref, U wherein
SdqBe current line voltage, L
mBe mutual inductance between stator and rotor winding, ω
sBe mains frequency;
(3) through rotor current closed-loop control network rotor current is carried out tracking Control, realize that rotor is synchronous fast.Step (2) is gone on foot the i that calculates
Rdq_refInput as the rotor current adjuster is given, the actual rotor current i
RdqAs the input feedback of rotor current adjuster, the rotor port instantaneous voltage that simultaneously step (1) is obtained
Feedforward compensation item as the output of rotor current adjuster;
(4) with the output u of rotor current closed-loop control network
Rdq_refThrough coordinate transform, obtain the input u of space voltage vector generating module
R α β _ refThereby, produce the pwm signal that is used to drive the rotor-side power model.
(5) treat rotor current i
RdqFollow the tracks of the rotor current instruction i that rotor needs synchronously fully
Rdq_refThe time, recovering control to the active power and the reactive power of double-fed type asynchronous generator, rotor-side converter restarted during completion double-feedback aerogenerator group low-voltage was passed through.
During low-voltage is passed through in the restarting process of rotor-side converter, though the rotor induction kinetic potential change with the variation of generator operating state because the floating regulating action of rotor current adjuster can compensate the variation of rotor induction kinetic potential.During general rotor-side converter of double-fed wind generating set self-starting; Stator is not incorporated into the power networks; The rotor induction kinetic potential that remanent magnetism forms can be ignored basically; Therefore rotor-side converter of double-fed wind generating set routine self-starting mode contradiction not under rotor current control block diagram shown in the drawings and the line voltage normal condition; Be equally applicable to rotor-side converter of double-fed wind generating set self-starting under the line voltage normal condition, just under the line voltage normal condition during rotor-side converter of double-fed wind generating set self-starting, the feedforward compensation item of rotor current adjuster output is almost 0.
Principle and the application note of the present invention in the double-feedback aerogenerator group is not limited to present embodiment, can also comprise other forms, but have versatility for control principle used in the present invention and method.
Claims (1)
1. a low-voltage is passed through and is used the rotor-side converter of double-fed wind generating set rapid restarting method, it is characterized in that: comprise the steps:
(1) before rotor-side converter is restarted; Detect the rotor port voltage of double-fed type asynchronous generator; And with detected value through coordinate transform, obtain the rotor port instantaneous voltage
of dq rotating coordinate system lower rotor part side converter before restarting
(2) ignore stator resistance, through formula i
Rdq_ref=U
Sdq/ (j ω
s* L
m) approximate calculation goes out under the current line voltage to realize the synchronous needed rotor current instruction i of double-feedback aerogenerator group rotor
Rdq_ref, U wherein
SdqBe current line voltage, L
mBe mutual inductance between stator and rotor winding, ω
sBe mains frequency;
(3) through rotor current closed-loop control network rotor current is carried out tracking Control, realize that rotor is synchronous fast; The i that step (2) is calculated
Rdq_refInput as the rotor current adjuster is given, the actual rotor current i
RdqAs the input feedback of rotor current adjuster, the rotor port instantaneous voltage that simultaneously step (1) is obtained
Feedforward compensation item as the output of rotor current adjuster;
(4) with the output u of rotor current closed-loop control network
Rdq_refThrough coordinate transform, obtain the input u of space voltage vector generating module
R α β _ refThereby, produce the pwm signal that is used to drive the rotor-side power model;
(5) treat the actual rotor current i
RdqFollow the tracks of the rotor current instruction i that rotor needs synchronously fully
Rdq_refThe time, recovering control to the active power and the reactive power of double-fed type asynchronous generator, rotor-side converter restarted during completion double-feedback aerogenerator group low-voltage was passed through.
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|---|---|---|---|
| CN2010101707948A CN101860040B (en) | 2010-05-04 | 2010-05-04 | Rotor-side converter of double-fed wind generating set for low voltage ride through and rapid restarting method thereof |
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| CN101860040B true CN101860040B (en) | 2012-08-29 |
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| CN102570962B (en) * | 2012-02-03 | 2014-03-26 | 阳光电源股份有限公司 | Double-fed wind power generation high-voltage through control structure, and generator and generation system |
| CN102684594B (en) * | 2012-05-03 | 2014-09-17 | 阳光电源股份有限公司 | Quick restart method for rotor side converter of doubly-fed wind generating set |
| CN112003321B (en) * | 2020-08-11 | 2022-05-17 | 宝鸡文理学院 | Low-voltage ride through control method for dynamic resistor of double-feeder rotor string |
Citations (4)
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|---|---|---|---|---|
| CN101299540A (en) * | 2007-04-30 | 2008-11-05 | 国网南京自动化研究院 | Apparatus for implementing low voltage cross-over of wind generator set |
| CN101383580A (en) * | 2008-10-22 | 2009-03-11 | 重庆大学 | Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network |
| CN101604954A (en) * | 2009-07-13 | 2009-12-16 | 山西合创电力科技有限公司 | Double-fed wind power generator vector and direct torque control integrated approach |
| CN101609992A (en) * | 2009-06-24 | 2009-12-23 | 北京利德华福电气技术有限公司 | Converter for low-voltage traversing double-fed wind driven generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2518074C (en) * | 2003-05-02 | 2011-07-26 | Xantrex Technology Inc. | Control system for doubly fed induction generator |
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Patent Citations (4)
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|---|---|---|---|---|
| CN101299540A (en) * | 2007-04-30 | 2008-11-05 | 国网南京自动化研究院 | Apparatus for implementing low voltage cross-over of wind generator set |
| CN101383580A (en) * | 2008-10-22 | 2009-03-11 | 重庆大学 | Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network |
| CN101609992A (en) * | 2009-06-24 | 2009-12-23 | 北京利德华福电气技术有限公司 | Converter for low-voltage traversing double-fed wind driven generator |
| CN101604954A (en) * | 2009-07-13 | 2009-12-16 | 山西合创电力科技有限公司 | Double-fed wind power generator vector and direct torque control integrated approach |
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