CN205141702U - Double -fed aerogenerator low voltage ride through system - Google Patents
Double -fed aerogenerator low voltage ride through system Download PDFInfo
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- CN205141702U CN205141702U CN201520998714.6U CN201520998714U CN205141702U CN 205141702 U CN205141702 U CN 205141702U CN 201520998714 U CN201520998714 U CN 201520998714U CN 205141702 U CN205141702 U CN 205141702U
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- comparator
- regulator
- double
- low voltage
- wind power
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The utility model provides a double -fed aerogenerator low voltage ride through system, it relates to a generator low voltage ride through system. The utility model discloses a to solve present double -fed aerogenerator low voltage ride through system low voltage ride through ability low, the reactive compensation effect is poor, leads to the fact double -fed aerogenerator's problem with high costs. The utility model discloses a reactive compensation controller includes first comparator, the second comparator, the third comparator, the fourth comparator, a PI regulator, the 2nd PI regulator, the 3rd PI regulator, the 3rd PI regulator, a transformation of coordinates module, the 2nd transformation of coordinates module and phase -locked loop, first comparator connects gradually a PI regulator, connect a coordinate transformation module behind third comparator and the 3rd PI regulator, the second comparator connects gradually the 2nd PI regulator, connect a coordinate transformation module behind fourth comparator and the fourth PI regulator. The utility model discloses reach good reactive compensation effect on the basis of converter outside increase not.
Description
Technical field
The utility model relates to generator low voltage ride through system, is specifically related to a kind of double-fed wind power generator low voltage ride through system, belongs to double-fed wind power generator technical field.
Background technology
In the last few years, along with country is to the attention further of generation of electricity by new energy technology, wind power generation becomes now very popular new industry.Wind-driven generator has different types of machines available, and double-fed asynchronous formula and permanent magnet direct-driven cross the type being progressively chosen as main flow in Wind Power Development process so far.One of critical problem of current dual-feed asynchronous wind power generator is exactly low voltage crossing technology.Domestic at present what mainly adopt low voltage crossing is that crowbar circuit suppresses, but it can bring a series of shortcoming.By force double-fed wind power generator is become Module of Asynchronous Generator when line voltage is low, absorb idle like this from electrical network, be unfavorable for the recovery of voltage after fault.
From power system reactive power compensation principle, the number of line voltage reactive power affects the height of line voltage.Grid voltage sags can recover line voltage by carrying out reactive power compensation to it.The comparatively ripe reactive power compensation technology existed at present comprises, shunt capacitor, SVC, SVG etc.The wherein novel SVG based on FACTS technology is the most effective power system reactive power compensation scheme, but if is directly applied to double-fed wind power generator.The cost of double-fed generator will certainly be increased.
Utility model content
The purpose of this utility model is low in order to solve existing double-fed wind power generator low voltage ride through system low voltage ride-through capability, and reactive power compensation weak effect, causes the problem that the cost of double-fed wind power generator is high.
The technical solution of the utility model is: a kind of double-fed wind power generator low voltage ride through system, comprises electrical network, idle compensating control, PWM generator and back-to-back converter, described idle compensating control comprises the first comparator, second comparator, 3rd comparator, 4th comparator, first pi regulator, second pi regulator, 3rd pi regulator, 4th pi regulator, first coordinate transformation module, second coordinate transformation module and phase-locked loop, described first comparator connects the first pi regulator successively, 3rd comparator is connected the first coordinate transferring with after the 3rd pi regulator, and the second comparator connects the second pi regulator successively, 4th comparator is connected the first coordinate transferring with after the 4th pi regulator, the output of the first coordinate transferring connects the grid side converter control terminal of converter back-to-back by PWM generator, the input of described phase-locked loop is connected electrical network with the input of the second coordinate transferring, the output of the second coordinate transferring connects the 3rd comparator and the 4th comparator respectively, and the output of phase-locked loop connects the second coordinate transferring and the first coordinate transferring respectively.
Described double-fed wind power generator low voltage ride through system comprises passive filter, and described passive filter input is connected on the brachium pontis mid point of three brachium pontis of grid side converter, and the output of passive filter connects electrical network.
Described double-fed wind power generator low voltage ride through system comprises breakdown switch, and the rotor of double-fed wind power generator connects the rotor-side brachium pontis mid point of converter back-to-back by breakdown switch.
Described double-fed wind power generator low voltage ride through system comprises crowbar circuit, and described crowbar circuit and double-fed wind power generator rotor winding connect.
The utility model compared with prior art has following effect: double-fed wind power generator low voltage ride through system of the present utility model ensures double-fed wind power generator not off-grid operation when low voltage failure of electric network; Traditional low voltage crossing can absorb idle from electrical network, be unfavorable for that line voltage recovers, and the double-fed wind power generator that the utility model adopts not only does not absorb idle from electrical network, and can compensate machine end reactive power.The dc-link capacitance that the utility model adopts double feedback electric engine itself own and converter, the basis not increasing additional converter reaches good reactive power compensation effect, greatly save cost undoubtedly compared with additionally installing the double-fed generator of reactive-load compensation equipment additional.
Accompanying drawing explanation
Fig. 1, overall structure circuit diagram of the present utility model;
Fig. 2, the circuit theory diagrams of idle compensating control of the present utility model.
Embodiment
Accompanying drawings embodiment of the present utility model, a kind of double-fed wind power generator low voltage ride through system of present embodiment, comprise equivalent electrical network F, idle compensating control A, PWM generator B and back-to-back converter C, double-fed wind power generator G passes through converter C back-to-back and connects electrical network, described idle compensating control A comprises the first comparator 1, second comparator 2, 3rd comparator 3, 4th comparator 4, first pi regulator 5, second pi regulator 6, 3rd pi regulator 7, 4th pi regulator 8, first coordinate transformation module 9, second coordinate transformation module 10 and phase-locked loop 11, described first comparator 1 connects the first pi regulator 5 successively, 3rd comparator 3 is connected the first coordinate transferring 9 with after the 3rd pi regulator 7, second comparator 2 connects the second pi regulator 6 successively, 4th comparator 4 is connected the first coordinate transferring 9 with after the 4th pi regulator 8, the output of the first coordinate transferring 9 connects the grid side converter control terminal of converter C back-to-back by PWM generator B, the input of described phase-locked loop 11 is connected equivalent electrical network F with the input of the second coordinate transferring 10, the output of the second coordinate transferring 10 connects the 3rd comparator 3 and the 4th comparator 4 respectively, the output of phase-locked loop 11 connects the second coordinate transferring 10 and the first coordinate transferring 9 respectively.
Described double-fed wind power generator low voltage ride through system comprises passive filter E, and described passive filter E input is connected on the brachium pontis mid point of three brachium pontis of grid side converter, and the output of passive filter E connects equivalent electrical network F.
Described double-fed wind power generator low voltage ride through system comprises breakdown switch KM1, and the rotor of double-fed wind power generator G connects the rotor-side brachium pontis mid point of converter C back-to-back by breakdown switch KM1.
Described double-fed wind power generator low voltage ride through system comprises crowbar circuit D, and described crowbar circuit D and double-fed wind power generator G rotor windings connect.
Direct voltage on dc-link capacitance is transformed to one group of three-phase alternating current output voltage by grid side converter by the utility model, output voltage is connected with AC system by passive filtration unit again, by suitably regulating amplitude and the phase place of grid side converter output voltage, or directly control its ac-side current, this circuit just can be made to absorb or send the reactive current met the demands, realize the object of dynamic passive compensation.
As shown in Figure 2, present embodiment comprises two cascade Mach-Zehnder interferometer loops.The voltage control loop of outside independently adjust voltage and the DC capacitor voltage of wind field access point G, the current control loop generation dq component of voltage of inside, immediately for PWM generator to produce IGBT gate control signal.Phase-locked loop in figure can realize grid side voltage vector V
gwith control reference signal synchronous.
Above formula represents which the active power that grid side converter compensates all measured relevant with reactive power with, and wherein Id and Iq represents electric current phasor respectively
d, q axle component; V
cdand V
cqrepresent grid side converter output voltage V respectively
cd, q axle component.D, q axle component and three-phase electricity tolerance are changed mutually by coordinate transform, and pass through the three-phase voltage of phase-locked loop detection node G, obtain the angle of coordinate transform.If ignore switching loss and harmonic wave, then can obtain relational expression:
P∝U
dcI
dc
V in formula
dcand I
dcrepresent DC bus-bar voltage and the DC bus current of double-fed wind power generator respectively.Owing to introducing dq0 coordinate system, feedback current Id and Iq of command current value and grid side converter is direct current signal when stable state, so can realize the current tracking without steady-state error by the 3rd pi regulator and the 4th pi regulator.
By comparison reference voltage and wind farm grid-connected point voltage V
gdifference between effective value, just error signal can be obtained, second pi regulator is according to error signal, control command is sent to the q shaft current of grid side converter, the three-phase current of following grid side converter is detected and is converted to dq component, last 4th pi regulator is that converter generates d axle reference voltage signal, and from formula 1, its value is proportional to q shaft current.In like manner two other PI controller produces q axle reference voltage signal, maintenance DC tache voltage is steady state value, such three-phase voltage reference signal converts dq reference voltage signal to, maintenance DC tache voltage is steady state value, according to the gate turn off thyristor switching rules of three-level converter, three-phase reference signal compares, to produce the three level grid side converter switching signal based on IGBT thyristor switch with two carrier signal
The working method of the present embodiment is as follows:
When line voltage is normal, the switching tube IGBT1 grid of crowbar circuit is low level, and IGBT1 turns off, the obstructed overcurrent of crowbar circuit.Breakdown switch KM1 closes, and motor is connected to electrical network by converter back-to-back.It is now double-fed wind power generator normal operating condition.When low voltage failure of electric network being detected, IGBT1 conducting, breakdown switch KM1 disconnects, and rotor electric current flows through crowbar circuit.From Electrical Motor knowledge: double-fed wind power generator rotor winding is now equivalent to cage modle winding.Whole motor is equivalent to induction machine, the converter back-to-back of motor and motor out of touch.The operation of induction machine will absorb inactivity from electrical network, and from reactive power correlation theory, reactive power maintains the power of line voltage just, also will from electrical network absorbing reactive power when line voltage itself falls, and this is obviously unfavorable for that line voltage recovers.At this moment, the first set control program that converter surveyed by net is switched to the second cover control program by us, dc-link capacitance voltage transformation is one group of three-phase alternating current output voltage by the second cover control program Controling network side converter, output voltage is connected with AC system by passive filtration unit again, by suitably regulating amplitude and the phase place of grid side converter output voltage, or directly control its ac-side current, this circuit just can be made to absorb or send the reactive current met the demands, realize the object of dynamic passive compensation.
The exemplary illustration of present embodiment just to this patent, does not limit its protection range, and those skilled in the art can also change, as long as no the Spirit Essence exceeding this patent, in the protection range of this patent its local.
Claims (4)
1. a double-fed wind power generator low voltage ride through system, comprises electrical network, idle compensating control, PWM generator and back-to-back converter, is characterized in that: described idle compensating control comprises the first comparator, second comparator, 3rd comparator, 4th comparator, first pi regulator, second pi regulator, 3rd pi regulator, 4th pi regulator, first coordinate transformation module, second coordinate transformation module and phase-locked loop, described first comparator connects the first pi regulator successively, 3rd comparator is connected the first coordinate transferring with after the 3rd pi regulator, and the second comparator connects the second pi regulator successively, 4th comparator is connected the first coordinate transferring with after the 4th pi regulator, the output of the first coordinate transferring connects the grid side converter control terminal of converter back-to-back by PWM generator, the input of described phase-locked loop is connected electrical network with the input of the second coordinate transferring, the output of the second coordinate transferring connects the 3rd comparator and the 4th comparator respectively, and the output of phase-locked loop connects the second coordinate transferring and the first coordinate transferring respectively.
2. a kind of double-fed wind power generator low voltage ride through system according to claim 1, it is characterized in that: described double-fed wind power generator low voltage ride through system comprises passive filter, described passive filter input is connected on the brachium pontis mid point of three brachium pontis of grid side converter, and the output of passive filter connects electrical network.
3. a kind of double-fed wind power generator low voltage ride through system according to claim 1, it is characterized in that: described double-fed wind power generator low voltage ride through system comprises breakdown switch, the rotor of double-fed wind power generator connects the rotor-side brachium pontis mid point of converter back-to-back by breakdown switch.
4. a kind of double-fed wind power generator low voltage ride through system according to claim 1, it is characterized in that: described double-fed wind power generator low voltage ride through system comprises crowbar circuit, described crowbar circuit and double-fed wind power generator rotor winding connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520998714.6U CN205141702U (en) | 2015-12-04 | 2015-12-04 | Double -fed aerogenerator low voltage ride through system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520998714.6U CN205141702U (en) | 2015-12-04 | 2015-12-04 | Double -fed aerogenerator low voltage ride through system |
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| CN205141702U true CN205141702U (en) | 2016-04-06 |
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| CN201520998714.6U Expired - Fee Related CN205141702U (en) | 2015-12-04 | 2015-12-04 | Double -fed aerogenerator low voltage ride through system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130074A (en) * | 2016-08-17 | 2016-11-16 | 国网福建省电力有限公司 | A kind of method of raising wind energy turbine set low voltage ride-through capability based on SVG equipment |
| CN107425542A (en) * | 2017-06-30 | 2017-12-01 | 太原理工大学 | The control method of DFIG reactive power compensations in low voltage failure crossing process |
| CN109684208A (en) * | 2018-12-17 | 2019-04-26 | 上海致远绿色能源股份有限公司 | A kind of in-circuit emulation debugging guard method of microprocessor |
-
2015
- 2015-12-04 CN CN201520998714.6U patent/CN205141702U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130074A (en) * | 2016-08-17 | 2016-11-16 | 国网福建省电力有限公司 | A kind of method of raising wind energy turbine set low voltage ride-through capability based on SVG equipment |
| CN107425542A (en) * | 2017-06-30 | 2017-12-01 | 太原理工大学 | The control method of DFIG reactive power compensations in low voltage failure crossing process |
| CN107425542B (en) * | 2017-06-30 | 2019-07-26 | 太原理工大学 | The control method of DFIG reactive power compensation in low voltage failure crossing process |
| CN109684208A (en) * | 2018-12-17 | 2019-04-26 | 上海致远绿色能源股份有限公司 | A kind of in-circuit emulation debugging guard method of microprocessor |
| CN109684208B (en) * | 2018-12-17 | 2022-07-15 | 上海致远绿色能源股份有限公司 | On-line simulation debugging protection method for microprocessor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 Termination date: 20161204 |