CN205141698U - Double -fed wind generator system - Google Patents
Double -fed wind generator system Download PDFInfo
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- CN205141698U CN205141698U CN201520760509.6U CN201520760509U CN205141698U CN 205141698 U CN205141698 U CN 205141698U CN 201520760509 U CN201520760509 U CN 201520760509U CN 205141698 U CN205141698 U CN 205141698U
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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
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Abstract
The utility model discloses a double -fed wind generator system, this double -fed wind generator system includes: double -fed generator, air circuit breaker, net side reactor, net side power converter, machine side power converter and machine side reactor, the stator of double -fed generator disposes stator be incorporated into the power networks contactor and stator short circuit contactor, air circuit breaker one end is connected to the electric wire netting, the other end respectively with it is continuous that net side reactor and motor stator's stator is incorporated into the power networks the contactor, net side power converter's one end with net side reactor is connected, and the other end is connected with dc bus and bleeder circuit, machine side power converter's one end is connected the bleeder circuit, the other end is connected the one end of machine side reactor, the other end of machine side reactor connect in the rotor of double -fed generator. Therefore, the utility model discloses a double -fed wind generator system can be in that to improve when making grid voltage fall when low wind speed wind energy utilization is rateed direct current busbar voltage controllable.
Description
Technical field
The utility model relates to technical field of wind power, particularly a kind of dual feedback wind power generation system.
Background technology
In energy shortage and environmental pollution day by day serious today, wind energy causes increasing attention as one of most important alternative energy source, and wind generating technology worldwide obtains huge development.At present, according to data, along with national installed capacity increases gradually, the wind energy turbine set that wind-resources is good is divided complete substantially, the wind energy turbine set of low wind speed resource is more and more favored, and the available low wind speed resource area in the whole nation accounts for 68% of total wind energy resources district.
Due to the restriction of converter rated power and controllable voltage scope, cause existing double-fed wind generator at low wind speed interval, can not be incorporated into the power networks by low wind speed, directly reduce the utilization ratio of wind energy.To this, once someone proposed at low wind speed interval, and double-fed generator unit operation pattern is squirrel-cage power generation mode, but present inventor finds:
How under mouse cage operational mode, to realize low voltage crossing is technological difficulties, but not clear and definite effective solution.And existing solution is when low voltage crossing, Crowbar can be triggered and to release energy, meanwhile, pusher side module needs a few tens of milliseconds that quits work, this can cause System Reactive Power uncontrollable, when being therefore difficult to realize low voltage crossing, for electrical network provides reactive power support.And even some scheme, also can absorb idle in a large number.
Utility model content
In view of this, the object of the utility model embodiment is to propose a kind of dual feedback wind power generation system, can improve to make grid voltage sags while low wind speed wind energy utilization time DC bus-bar voltage controlled.
Further, the dual feedback wind power generation system that the utility model proposes comprises: double-fed generator, air circuit, network reactor, net side power inverter, pusher side power inverter and pusher side reactor; The stator arrangement of described double-fed generator has the grid-connected contactor of stator and stator short circuit contactor, and described air circuit one end is connected to electrical network, and the other end is connected with the grid-connected contactor of the stator of motor stator with described network reactor respectively; One end of described net side power inverter is connected with described network reactor, and the other end is connected with DC bus and leadage circuit; One end of described pusher side power inverter connects described leadage circuit, and the other end connects one end of described pusher side reactor, and the other end of described pusher side reactor is connected to the rotor of described double-fed generator.
Alternatively, in certain embodiments, described leadage circuit is copped wave absorbing circuit, is connected in parallel on DC bus; Described copped wave absorbing circuit comprises Rc power consumption resistance, switching device and absorbing circuit thereof.
Alternatively, in certain embodiments, described absorbing circuit comprises resistance Rs, diode Ds and electric capacity Cs, and resistance Rs is in parallel with diode Ds, and connects with electric capacity Cs.
Alternatively, in certain embodiments, described absorbing circuit comprises resistance Rs, electric capacity Cs and switching device, and resistance Rs connects with electric capacity Cs, in parallel with switching device.
Alternatively, in certain embodiments, described leadage circuit is Crowbar circuit module, and described Crowbar circuit module is arranged on generator amature side loop.
Alternatively, in certain embodiments, described net side power inverter adopts two close cycles design, and outer shroud is voltage power-less ring, and inner ring is electric current loop.
Alternatively, in certain embodiments, when described DC bus-bar voltage is higher than the threshold value arranged, described copped wave absorbing circuit starts, for DC side energy of releasing.
Alternatively, in certain embodiments, the feedforward system of described net side power inverter for controlling the action frequency of described copped wave absorbing circuit, and by the electric energy feedback of releasing on electrical network.
Alternatively, in certain embodiments, described feedforward system also for Real-time Obtaining pusher side power inverter inflow or flow out to the electric current of net side power inverter, suppress DC bus-bar voltage to raise.
Alternatively, in certain embodiments, described pusher side power inverter is used for controlling the input of its electromagnetic power according to the situation of Voltage Drop, limits the rate of climb of described DC bus-bar voltage.
Compared with prior art, the utility model embodiment has the following advantages:
In dual feedback wind power generation system of the present utility model, save Crowbar bleeder resistance, when solving Crowbar circuit working, handoff procedure impacts large, and rotor-side current waveform is poor, loses the shortcomings such as controllability; Further, adopt squirrel-cage generating operating mode, while the low wind speed wind energy utilization of raising, when meeting grid voltage sags, DC bus-bar voltage is controlled and send certain reactive power support power system restoration.In addition, improve wind energy utilization and the energy output of low wind speed section by controlling double-fed wind power generator operational mode, meet the low voltage crossing technical requirement of low wind speed operation area, and its cost is lower, reliability is high simultaneously.
Accompanying drawing explanation
The accompanying drawing of formation the utility model embodiment part is used to provide the further understanding to the utility model embodiment, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
The circuit theory schematic diagram of the dual feedback wind power generation system that Fig. 1 provides for the utility model embodiment;
A kind of copped wave absorbing circuit principle schematic that Fig. 2 A provides for the utility model embodiment;
The another kind of copped wave absorbing circuit principle schematic that Fig. 2 B provides for the utility model embodiment;
Fig. 3 nets side power inverter control principle schematic diagram in the utility model embodiment;
Fig. 4 is pusher side power inverter control principle schematic diagram in the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
It should be noted that, when not conflicting, the feature in the utility model embodiment and embodiment can combine mutually.
Below in conjunction with accompanying drawing, each preferred embodiment of the present utility model is described further:
With reference to Fig. 1, it illustrates the structural principle of the dual feedback wind power generation system that the present embodiment proposes, this dual feedback wind power generation system comprises: double-fed generator, air circuit, network reactor, net side power inverter, pusher side power inverter and pusher side reactor.
As shown in Figure 1, the stator arrangement of double-fed generator has the grid-connected contactor of stator and stator short circuit contactor, and air circuit one end is connected to electrical network, and the other end is connected with the grid-connected contactor of the stator of motor stator with network reactor respectively.One end of net side power inverter is connected with network reactor, and the other end is connected with DC bus and leadage circuit.One end of pusher side power inverter connects leadage circuit, and one end of other end junctor reactor, the other end of pusher side reactor is connected to the rotor of double-fed generator.
Wherein, the feedforward system of net side power inverter for controlling the action frequency of copped wave absorbing circuit, and by the electric energy feedback of releasing on electrical network.As the optional execution mode of one, in above-described embodiment, net side power inverter adopts two close cycles design, and outer shroud is voltage power-less ring, and inner ring is electric current loop.Optionally, when DC bus-bar voltage is higher than the threshold value arranged, copped wave absorbing circuit starts, for DC side energy of releasing.
In above-described embodiment, pusher side power inverter is used for controlling the input of its electromagnetic power according to the situation of Voltage Drop, the rate of climb of restriction DC bus-bar voltage, realizes the torque component of squirrel-cage motor and the uneoupled control of magnetic linkage component according to the characteristic of mouse cage generator.
For the dual feedback wind power generation system shown in Fig. 1, it is wide wind speed dual feedback wind power generation system, can comprise: electrical network, double-fed generator, air circuit K1, net side pwm power converter, pusher side pwm power converter, DC bus, du/dt reactor L1, L2, the grid-connected contactor KM1 of stator, stator short circuit contactor KM2 and copped wave absorbing circuit module etc.
Wherein, air circuit K1 one end is connected with electrical network, and the other end is connected with motor stator with net side pwm power converter.Stator is connected with stator grid-connected contactor KM1 and stator short circuit contactor KM2, net side pwm power converter and pusher side pwm power converter, and is connected with copped wave absorbing circuit by DC bus.Wherein, du/dt reactor one end exchange with pusher side power inverter outlet be connected.
In above-described embodiment, while adopting above-mentioned dual feedback wind power generation system can effectively improve wind energy utilization and energy output, meet the low voltage crossing technical requirement of low wind speed operation area, and its cost is lower, reliability is high.
As the optional execution mode of one, in above-described embodiment, leadage circuit can be copped wave and absorbs (Chopper) circuit.With reference to Fig. 2 A and Fig. 2 B, it is the circuit theory schematic diagram of Chopper circuit, and Chopper circuit in parallel is on DC bus, and optionally, Chopper circuit can comprise Rc power consumption resistance, switching device and absorbing circuit thereof.
Optionally, in above-mentioned Chopper circuit, as shown in Figure 2 A, power consumption resistance Rc connects with switching device IGBT, is attempted by DC bus.Wherein, absorbing circuit can comprise a resistance Rs, diode Ds and electric capacity Cs, and resistance Rs is in parallel with diode Ds, and connects with electric capacity Cs.When DC bus-bar voltage is higher than certain threshold value, Chopper circuit start, for DC side energy of releasing, to maintain busbar voltage within the specific limits.
Optionally, in above-mentioned Chopper circuit, as shown in Figure 2 B, power consumption resistance Rc connects with switching device IGBT, is attempted by DC bus.Wherein, absorbing circuit can comprise resistance Rs, electric capacity Cs and switching device, and resistance Rs connects with electric capacity Cs, in parallel with switching device.When DC bus-bar voltage is higher than certain threshold value, Chopper circuit start, for DC side energy of releasing, to maintain busbar voltage within the specific limits.
In addition, as the optional execution mode of one, in above-described embodiment, leadage circuit also can be Crowbar circuit module, and Crowbar circuit module is arranged on generator amature side loop.
Therefore, under the double-fed wind power generator of above-described embodiment operates in squirrel-cage power generation mode, some implementation methods of technology during low voltage crossing, mainly changing its operational mode by changing the double-fed wind power generator mode of connection, improving the wind energy utilization of low wind speed section by controlling double-fed wind power generator operational mode.
Based on above technical barrier, above-described embodiment adopts the auxiliary circuit of a kind of Chopper and combines with corresponding control algolithm, while saving Crowbar bleeder resistance, achieve the object that impulse current is little, rotor-side waveform is good, reactive power is controlled.While the present embodiment can realize improving wind energy utilization and energy output effectively, meet the low voltage crossing technical requirement of low wind speed operation area, and its cost is lower, reliability is high.
The dual feedback wind power generation system that above-described embodiment proposes is that this dual feedback wind power generation system can have following two kinds of operational modes based on one wide wind speed double-fed wind power generator group operational mode:
1) mouse cage power generation mode: KM1 disconnects, and KM2 closes a floodgate, and by stator winding short circuit, converter is that electric energy outputs to electrical network by controlling rotor loop by the changes mechanical energy of generation.This and general squirrel cage asynchronous motor connection are different: general asynchronous machine connection is that stator connects frequency converter, rotor is squirrel-cage short circuit.
2) doubly-fed generation pattern: KM1 closes a floodgate, and KM2 disconnects, and namely the stator of motor is received on electrical network, and stator short circuit contactor disconnects, and produces electric energy output to electrical network by convertor controls rotor loop.
Wherein, the control of mouse cage power generation mode: by what realize the control of two pwm converter, common control strategy is divided into by two pwm converter net side power inverter and pusher side power inverter to control respectively, and the control objectives of net side power inverter mainly keeps the constant of DC voltage under unity power factor.Pusher side power inverter realizes the torque component of squirrel-cage motor and the uneoupled control of magnetic linkage component according to the characteristic of mouse cage generator.
With reference to shown in Fig. 3, it is the control principle schematic diagram of net side power inverter, and net side power inverter can adopt two close cycles to design, and outer shroud is voltage power-less ring, and inner ring is electric current loop.The given difference with the actual voltage recorded in storage capacitor two ends of DC bus-bar voltage is through PI controller (ProportionalIntegralController, pi controller) regulate, as the set-point i of d shaft current after adding feedforward controller output valve
dref, the set-point of d shaft current gets difference with the d axle power network current through coordinate transform, obtains u through PI controller
dref, q axle is idle instruction set-point obtains the given value of current value i of q axle with the idle difference calculated through PI controller
qref, then obtain u with the q axle power network current difference through coordinate transform by PI controller
qref, this reference voltage carries out SVPWM modulation after coordinate transform, produces the control of drive singal realization to net side power inverter.
Pusher side power inverter is as rotor converter, and its control objectives is: control the electromagnetic torque of generator, maximal wind-energy capture and realize uneoupled control that is meritorious, reactive power under rated wind speed.With reference to the pusher side power inverter control principle shown in Fig. 4, known:
Adopt rotor-side variable frequency vector control, achieve the decoupling zero stator magnetic linkage of rotor excitation current component and torque current component only by exciting current i
rddetermine, when controlling exciting current and namely keeping magnetic linkage to be constant, motor torque T
ewill only by torque current i
rqdetermine.
When there is grid voltage sags fault, the mechanical output that the wind generator system of mouse cage power generation mode absorbs from wind energy conversion system can not deliver to electrical network in time, surplus power side can accumulate in DC bus capacitor by pusher side power inverter, DC bus-bar voltage is raised rapidly until overvoltage, causes the device failure of converter.Therefore, if want to make the power in blower fan system reach balance, must carry out discharging on hardware and software and suppress energy accumulating on DC capacitor.
When electrical network falls, pusher side power inverter goes to judge that it falls the degree of depth and type by the voltage signal measurement of voltage sensor, the electromagnetic power input controlling pusher side power inverter is gone according to the situation of Voltage Drop, the electric flux that now previously blower fan had absorbed is converted into mechanical energy storage on the rotating speed of blower fan, limits the too fast rising of DC bus-bar voltage.Meanwhile, net side power inverter, on the one hand by current feed-forward system quick adjustment DC bus-bar voltage, reduces DC side leadage circuit Chopper action, and by this part electric energy feedback on electrical network.On the other hand by the control to idle component, export idle to electrical network, support electrical network and recover as early as possible.When DC bus-bar voltage exceedes predetermined value, net side power inverter controls output low level, and trigger Chopper circuit by fiber-optic signal, DC side of releasing energy, prevents DC bus overvoltage.
In above-described embodiment, the current feed-forward system principle of net side power inverter is: the active power that pusher side power inverter calculates is obtained load-current feedforward value divided by real-time DC bus-bar voltage, after 3S/2R conversion (3 phase static coordinate are to the conversion of 2 cordic phase rotators), the electric current exported with Voltage loop with together with given as the d shaft current of netting side power inverter, existing machine net side power inverter can be reduced like this when independently controlling, because wind speed mutation causes the sudden change of DC bus-bar voltage, simultaneously, when electric network fault, the inflow of pusher side power inverter can be obtained in real time or flow out to the electric current of net side power inverter, DC bus-bar voltage is suppressed to raise, thus reduce the action frequency of Chopper circuit, improve system reliability.
Compared with prior art, each embodiment of the utility model has the following advantages:
1, save Crowbar bleeder resistance, when solving Crowbar circuit working, handoff procedure impacts large, and rotor-side current waveform is poor, loses the shortcomings such as controllability;
2, adopt squirrel-cage generating operating mode, while the low wind speed wind energy utilization of raising, when meeting grid voltage sags, DC bus-bar voltage is controlled and send certain reactive power support power system restoration.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a dual feedback wind power generation system, is characterized in that, comprising: double-fed generator, air circuit, network reactor, net side power inverter, pusher side power inverter and pusher side reactor;
The stator arrangement of described double-fed generator has the grid-connected contactor of stator and stator short circuit contactor, and described air circuit one end is connected to electrical network, and the other end is connected with the grid-connected contactor of the stator of motor stator with described network reactor respectively;
One end of described net side power inverter is connected with described network reactor, and the other end is connected with DC bus and leadage circuit;
One end of described pusher side power inverter connects described leadage circuit, and the other end connects one end of described pusher side reactor, and the other end of described pusher side reactor is connected to the rotor of described double-fed generator.
2. dual feedback wind power generation system according to claim 1, is characterized in that, described leadage circuit is copped wave absorbing circuit, is connected in parallel on DC bus; Described copped wave absorbing circuit comprises Rc power consumption resistance, switching device and absorbing circuit thereof.
3. dual feedback wind power generation system according to claim 2, is characterized in that, described absorbing circuit comprises resistance Rs, diode Ds and electric capacity Cs, and resistance Rs is in parallel with diode Ds, and connects with electric capacity Cs.
4. dual feedback wind power generation system according to claim 2, is characterized in that, described absorbing circuit comprises resistance Rs, electric capacity Cs and switching device, and resistance Rs connects with electric capacity Cs, in parallel with switching device.
5. dual feedback wind power generation system according to claim 1, is characterized in that, described leadage circuit is Crowbar circuit module, and described Crowbar circuit module is arranged on generator amature side loop.
6. the dual feedback wind power generation system according to any one of claim 1 to 5, is characterized in that, described net side power inverter adopts two close cycles design, and outer shroud is voltage power-less ring, and inner ring is electric current loop.
7. the dual feedback wind power generation system according to any one of claim 2 to 4, is characterized in that, when described DC bus-bar voltage is higher than the threshold value arranged, described copped wave absorbing circuit starts, for DC side energy of releasing.
8. dual feedback wind power generation system according to claim 7, is characterized in that, the feedforward system of described net side power inverter for controlling the action frequency of described copped wave absorbing circuit, and by the electric energy feedback of releasing on electrical network.
9. dual feedback wind power generation system according to claim 8, is characterized in that, described feedforward system also for Real-time Obtaining pusher side power inverter inflow or flow out to the electric current of net side power inverter, suppress DC bus-bar voltage to raise.
10. dual feedback wind power generation system according to claim 9, is characterized in that, described pusher side power inverter is used for controlling the input of its electromagnetic power according to the situation of Voltage Drop, limits the rate of climb of described DC bus-bar voltage.
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| CN201520760509.6U CN205141698U (en) | 2015-09-29 | 2015-09-29 | Double -fed wind generator system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150900A (en) * | 2016-06-30 | 2016-11-23 | 华仪风能有限公司 | Double-fed asynchronous wind generator system and operation method thereof |
| CN107681692A (en) * | 2017-10-12 | 2018-02-09 | 许昌学院 | A kind of ac excitation power supply fault traversing control system |
| CN110729760A (en) * | 2019-10-31 | 2020-01-24 | 阳光电源股份有限公司 | Wind-solar hybrid power generation system |
| CN111211563A (en) * | 2020-01-13 | 2020-05-29 | 华北电力大学 | UPFC fault transition method based on improved Chopper circuit |
| CN111711389A (en) * | 2020-06-16 | 2020-09-25 | 上海电气风电集团股份有限公司 | Wind driven generator and control method and device of power conversion circuit of wind driven generator |
| CN115061384A (en) * | 2022-05-11 | 2022-09-16 | 国网山东省电力公司电力科学研究院 | Single-motor double-unit direct-drive fan semi-physical simulation electromagnetic model building method |
-
2015
- 2015-09-29 CN CN201520760509.6U patent/CN205141698U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150900A (en) * | 2016-06-30 | 2016-11-23 | 华仪风能有限公司 | Double-fed asynchronous wind generator system and operation method thereof |
| CN107681692A (en) * | 2017-10-12 | 2018-02-09 | 许昌学院 | A kind of ac excitation power supply fault traversing control system |
| CN110729760A (en) * | 2019-10-31 | 2020-01-24 | 阳光电源股份有限公司 | Wind-solar hybrid power generation system |
| CN111211563A (en) * | 2020-01-13 | 2020-05-29 | 华北电力大学 | UPFC fault transition method based on improved Chopper circuit |
| CN111711389A (en) * | 2020-06-16 | 2020-09-25 | 上海电气风电集团股份有限公司 | Wind driven generator and control method and device of power conversion circuit of wind driven generator |
| CN111711389B (en) * | 2020-06-16 | 2022-03-25 | 上海电气风电集团股份有限公司 | Wind driven generator and control method and device of power conversion circuit of wind driven generator |
| CN115061384A (en) * | 2022-05-11 | 2022-09-16 | 国网山东省电力公司电力科学研究院 | Single-motor double-unit direct-drive fan semi-physical simulation electromagnetic model building method |
| CN115061384B (en) * | 2022-05-11 | 2023-09-08 | 国网山东省电力公司电力科学研究院 | Method for constructing semi-physical simulation electromagnetic model of single-motor double-unit direct-driven fan |
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Address after: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee after: Sany Heavy Energy Co.,Ltd. Address before: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee before: SANY HEAVY ENERGY Co.,Ltd. Address after: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee after: SANY HEAVY ENERGY Co.,Ltd. Address before: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee before: SANY HEAVY ENERGY EQUIPMENT Co.,Ltd. |