CN204179684U - Wind turbine generator fault traversing device - Google Patents
Wind turbine generator fault traversing device Download PDFInfo
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- CN204179684U CN204179684U CN201420732528.3U CN201420732528U CN204179684U CN 204179684 U CN204179684 U CN 204179684U CN 201420732528 U CN201420732528 U CN 201420732528U CN 204179684 U CN204179684 U CN 204179684U
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- 238000005516 engineering process Methods 0.000 description 6
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- 230000005611 electricity Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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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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Abstract
The utility model provides a kind of wind turbine generator fault traversing device, this device comprises: pusher side current transformer, net side converter, dc-link capacitance and DC side chopper circuit module, wherein, described DC side chopper circuit module comprises multiple chopper circuit unit, described multiple chopper circuit unit is arranged between pusher side current transformer and net side converter, and in parallel with described dc-link capacitance.The utility model to achieve the voltage control of DC link within tolerance range, and then meeting different grid-connected requirement, realizes high voltage crossing function or the low voltage ride-through function of wind turbine generator, and reduces hardware cost.
Description
Technical field
The utility model relates to wind generating technology, particularly relates to a kind of wind turbine generator fault traversing device.
Background technology
Increasingly serious along with conventional fossil energy supply uncertain problem, environmental issue and energy-saving and emission-reduction situation, green regenerative energy sources more and more comes into one's own, especially in China, the renewable green energy resource development such as wind-powered electricity generation, photovoltaic generation rapidly, wherein, I to cross the growth of wind-powered electricity generation installation amount very rapid.
Along with the progressively increase of wind power generation scale, electrical network department of various countries is also constantly updating the electric power access technology requirement separately to wind energy turbine set, wherein, wind energy turbine set/high-voltage ride through of wind power generating set (HVRT, High Voltage Ride Through) ability and low voltage crossing (LVRT, LighVoltage Ride Through) capability problems become research/hot spot of public opinions gradually as being acknowledged as the challenging important technical requirement of most in the recent period.
Just at present, the high voltage crossing ability and the low voltage ride-through capability that realize direct-drive permanent magnet wind power generator group unit mainly contain two class technical schemes: 1) realized by DC side chopper circuit (Chopper circuit), 2) by other auxiliary equipment, as additional equipments such as energy storage device, the special current transformers of machine end.Wherein, DC side chopper circuit is more conventional, but, because the requirement of the high/low voltage ride through ability of every country is different, such as, voltage scope of application difference is large (such as, China is >=66kV to the voltage scope of application of low voltage crossing, and the U.S. is >=115kV), change in voltage level difference is large, the duration length difference of low voltage crossing is large, the duration of the inconsistent and high voltage crossing of failure recovery time and amplitude range difference large etc., if carry out the grid-connected requirement of satisfied such market area with an a kind of/mono-chopper circuit configuration, then chopper circuit cost can be very high.
Utility model content
Embodiment of the present utility model provides a kind of wind turbine generator fault traversing device, grid side voltage lifting or sagging time, realize the voltage control of DC link within tolerance range, and then high voltage crossing function or the low voltage ride-through function of wind turbine generator can realized.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A kind of wind turbine generator fault traversing device, described device comprises pusher side current transformer, net side converter, dc-link capacitance and DC side chopper circuit module; Wherein, described DC side chopper circuit module comprises multiple chopper circuit unit, and described multiple chopper circuit unit is arranged between pusher side current transformer 3 and net side converter 6, and in parallel with described dc-link capacitance.
Further, each described chopper circuit unit comprises IGBT (insulated gate bipolar transistor) power cell and at least one electric power generation unloading resistance.
Further, described IGBT power cell comprises 2 IGBT.
Further, described device also comprises voltage/current observation circuit and operational mode control circuit, described voltage/current observation circuit with and site be connected, for the actual measurement three-phase voltage U of detection of grid side
abc, actual measurement three-phase current I
abcwith actual measurement DC bus-bar voltage U
dc;
Described operational mode control circuit is connected between described voltage/current observation circuit and described DC chopper circuit module, for according to described actual measurement three-phase voltage U
abcwith described actual measurement DC bus-bar voltage U
dcdescribed and the operational mode of site is judged, determines described and site is in high voltage operational mode, normal operation mode or subnormal voltage operation pattern, and according to described in determining and the operational mode of site and actual measurement three-phase voltage U
abc, actual measurement three-phase current I
abcand actual measurement DC bus-bar voltage U
dcto described DC side chopper circuit module sending controling instruction.
The wind turbine generator fault traversing device that the utility model embodiment provides, by the modularized design to the DC side chopper circuit in current transformer, the number of DC side chopper circuit unit is correspondingly increased according to different grid-connected requirements, rational energy trasfer or consumption can not only be carried out under high/low voltage ride-through state, meet different grid-connected requirement, and reduce hardware cost.
Accompanying drawing explanation
Fig. 1 is the permanent magnet direct-drive wind generator system major loop topology diagram comprising DC side chopper circuit module of embodiment of the present utility model.
Fig. 2 is the control structure schematic diagram of the wind turbine generator fault traversing device of embodiment of the present utility model.
Fig. 3 is the energy balance relations schematic diagram of the wind generator system based on DC side chopper circuit module under fault traversing running status of embodiment of the present utility model.
Drawing reference numeral illustrates:
1-wind-driven generator; 2-generator side circuit breaker; 3-pusher side current transformer; 4-dc-link capacitance; 5-DC side chopper circuit module; 6-net side converter; 7-grid side circuit breaker; 8-grid side step-up transformer; 9-step-up transformer high side switch; 10-wind energy turbine set electrical network; 11-voltage/current observation circuit; 12-operational mode control circuit.
Embodiment
Analyze theoretically, under wind turbine generator normal operating condition, wind turbine generator main circuit power equilibrium equation is as shown in (1) formula (current transformer power loss is less, can ignore at this):
Wherein, P
genfor generator active power of output (namely pusher side current transformer is injected into the energy of current transformer DC link), P
gridfor wind turbine generator injects the active power of electrical network, P
dcfor current transformer DC bus power, U
dcfor DC voltage, I
dcfor DC side electric current, C
dcfor DC side electric capacity of voltage regulation.
From (1) formula, P
dcthe power that can carry is certain, because the power that dc-link capacitance can store is certain, when high voltage appears in grid side, because wind turbine generator injects the active-power P of electrical network
gridminimizing (high voltage crossing or low voltage crossing during) and reverse power P
negexistence, the equilibrium relation of the power shown in above formula (1) will be destroyed, DC voltage U
dcto rise sharply, thus entail dangers to device security or cause blower fan to trip.
In order to ensure DC voltage U
dcall the time be in acceptable rational scope, and make wind turbine generator possess certain high voltage crossing ability (HVRT) or low voltage ride-through capability (LVRT), need the excess energy consuming/shift DC link (DC link) by DC side chopper circuit, wherein, if there is high voltage in grid side, its power control equilibrium equation as shown in the formula:
If there is low-voltage in grid side, its power control equilibrium equation as shown in the formula:
In formula (2) and formula (3), P
negfor being injected into the reverse power of wind turbine generator from electrical network, P
rfor the power that DC side chopper circuit consumes/shifts.
In sum, according to formula (2) and formula (3) and in conjunction with the grid-connected requirement (specifically see related contents such as the grid-connected codes in various countries, can not repeating them here) of each market area, P
rbe not a fixed value, can be different according to the requirement of concrete power grid environment and every country.In this case, if only meet the grid-connected requirement of each market area with one or the configuration of a kind of DC side chopper circuit, so the power configuration of this DC side chopper circuit is obtained enough large with regard to needs, thus the demand that could meet in various situation, the hardware configuration cost of DC side chopper circuit can be increased like this, on the other hand, in the region that grid-connected requirement is lower, powerful like this DC side chopper circuit can not be fully utilized, thus cause the waste of DC side chopper circuit.
Based on above-mentioned analysis, the utility model proposes a kind of for wind turbine generator fault traversing device, main improvement is: DC side chopper circuit is carried out modularized design, modular DC side chopper circuit is connected electrically between pusher side current transformer and net side converter, and in parallel with dc-link capacitance, be used for consume/transfer DC link excess energy.
Be described in detail below in conjunction with the wind turbine generator fault traversing device of accompanying drawing to the utility model embodiment.
The wind turbine generator fault traversing device that embodiment of the present utility model provides comprises pusher side current transformer 3, net side converter 6, dc-link capacitance 4 and DC side chopper circuit module 5, wherein, DC side chopper circuit module 5 comprises multiple chopper circuit unit, the plurality of chopper circuit unit is arranged between pusher side current transformer 3 and net side converter 6, and in parallel with dc-link capacitance 4.
As shown in Figure 1, be the permanent magnet direct-drive wind generator system major loop topology diagram comprising DC side chopper circuit module of embodiment of the present utility model.In permanent magnet direct-drive wind generator system, wind-driven generator 1 accesses the converter part of wind turbine generator by generator side circuit breaker 2, wherein, converter part comprises pusher side current transformer 3, dc-link capacitance 4, DC side chopper circuit module 5 and net side converter 6, and the output of net side converter 6 accesses wind energy turbine set electrical network 10 after grid side circuit breaker 7, grid side step-up transformer 8, step-up transformer high side switch 9.
As can be seen from Figure 1, in the wind turbine generator fault traversing device of the utility model embodiment, dc-link capacitance 4 is in parallel with DC side chopper circuit module 5, and be connected electrically between pusher side current transformer 3 and net side converter 6, wherein, DC side chopper circuit mould 5 pieces comprises N number of DC side chopper circuit unit, and according to the utility model one embodiment, in DC side chopper circuit module 5, the number of DC side chopper circuit unit can require corresponding configuration according to reality is grid-connected.
Further, as can be seen from the figure, each DC side chopper circuit unit comprises IGBT power cell and at least one electric power generation unloading resistance (number of electric power generation unloading resistance can be set up according to actual needs), preferably, each IGBT power cell comprises two IGBT (insulated gate bipolar transistor).Electric power generation unloading resistance is generally connected in parallel between two IGBT (insulated gate bipolar transistor).
Fig. 2 is the control structure schematic diagram of the wind turbine generator fault traversing device of embodiment of the present utility model.
As shown in Figure 2, based on the wind turbine generator fault traversing device shown in Fig. 1, according to the utility model one embodiment, this device also comprises voltage/current observation circuit 11 and operational mode control circuit 12, voltage/current observation circuit 11 with and site be connected, for the actual measurement three-phase voltage U of detection of grid side
abc, actual measurement three-phase current I
abcwith actual measurement DC bus-bar voltage U
dc; Operational mode control circuit 12 is connected between voltage/current observation circuit 11 and DC side chopper circuit module 5, for the actual measurement three-phase voltage U of grid side detected according to voltage/current observation circuit 11
abcwith actual measurement DC bus-bar voltage U
dcto and the operational mode of site judge, to determine and site is in high voltage operational mode, normal operation mode or subnormal voltage operation pattern, and according to determine and the operational mode of site and actual measurement three-phase voltage U
abc, actual measurement three-phase current I
abcand actual measurement DC bus-bar voltage U
dcto DC side chopper circuit module 5 sending controling instruction.
At this, further illustrated by the technical scheme of example to the utility model embodiment.The actual measurement three-phase voltage U of the grid side that operational mode control circuit 12 can detect according to voltage/current observation circuit 11
abcjudge and the state of site, such as, following rule can be adopted to judge: if actual measurement three-phase voltage U
abcbe in the scope of 90% ~ 110% of rated voltage, then determine that also site is in normal operating condition; If actual measurement three-phase voltage U
abcbe less than 90% of rated voltage, then determine that also site is in subnormal voltage operation state; If actual measurement three-phase voltage U
abcbe greater than 110% of rated voltage, then determine that also site is in high voltage running status.When also site is in high voltage operational mode, operational mode control circuit 12 sends high voltage control command (such as to DC side chopper circuit module 5, control command can be PWM (pulse width modulation) signal control end of IGBT unit being carried out to switch control rule), after DC side chopper circuit module 5 receives this control command, to cannot inject the energy of electrical network in transfer/consumption DC loop, thus make wind turbine generator possess high voltage crossing ability; In like manner, when also site is in subnormal voltage operation pattern, operational mode control circuit 12 can send low-voltage control command to DC side chopper circuit module 5, after DC side chopper circuit module 5 receives this control command, to cannot inject the energy of electrical network in transfer/consumption DC loop, thus make wind turbine generator possess low voltage ride-through capability.And in the normal operating mode, DC side chopper circuit module 5 can not work.
Fig. 3 is the energy balance relations schematic diagram of the wind generator system based on DC side chopper circuit module under fault traversing running status of embodiment of the present utility model.
As shown in Figure 3, P
genafter pusher side current transformer 3, inject DC link (DC link), dc-link capacitance 4 in parallel with pusher side current transformer 3 and net side converter 6 in DC link carries out power storage (P
dc), and inject grid side (P through net side converter 6 again
grid), usually, in high voltage fail, grid side has reverse power P
negdC loop is injected by net side converter 6 from grid side.
By the utility model embodiment, DC side chopper circuit module 5 can according to P
gen, P
neg, P
gridand P
dccarry out power-balance adjustment, to ensure DC voltage U
dcall the time be in acceptable rational scope, and make wind turbine generator possess certain high voltage crossing ability (HVRT) or low voltage ride-through capability (LVRT), particularly, the DC side chopper circuit module 5 of the utility model embodiment can carry out power-balance control by following equation:
Formula (4) for grid side there is high voltage fail time, the equation that DC side chopper circuit module 5 power-balance controls, formula (5) for grid side there is low voltage failure time, the equation that DC side chopper circuit module 5 power-balance controls, compare can find out with above-mentioned formula (2) and formula (3), its difference is, in formula (4) and formula (5), by P
rsplit in order to P
r1to P
rN(representing the power of N number of DC side chopper circuit unit consumption/transfer respectively), this has fully demonstrated the modularization idea of the utility model embodiment, namely can the number of configuring direct current side chopper circuit unit as required, thus reasonably shifts/consume P
r.
Introduce the control principle of power-balance below again: when high voltage fail, because the lifting of grid side voltage makes active-power P
gridcannot be injected into electrical network, namely wind turbine generator injects the active-power P of electrical network
gridreduce, and there is reverse power P
neg, and P
genenergy be certain, make P
dcrise sharply (i.e. DC voltage U
dcrise sharply), in this case, need the multiple DC side chopper circuit unit consumption/transfer power by the utility model embodiment.By the utility model embodiment, at DC voltage U
dcboost excessive and excessive from site voltage nominal value side-play amount, and interconnection technology requires higher market area, can the more DC side chopper circuit unit of magnitude setting, by multiple electric power generation unloading resistance consumption/transfer power, and then make DC voltage U
dcreturn to rapidly voltage nominal value scope, thus make wind turbine generator possess certain high voltage crossing ability (HVRT), its energy relationship and power-balance control specifically can see formula (4).
In like manner, when low voltage failure, make active-power P due to grid side voltage sag
gridcannot be injected into electrical network, namely wind turbine generator injects the active-power P of electrical network
gridreduce, and do not produce reverse power P
neg, and P
genenergy be certain, thus can P be made
dcrise sharply (i.e. DC voltage U
dcrise sharply), DC voltage U be made
dcbe in acceptable rational scope, in this case, need the multiple DC side chopper circuit unit consumption/transfer power by the utility model embodiment.By the utility model embodiment, at DC voltage U
dcboost excessive and excessive from site voltage nominal value side-play amount, and interconnection technology requires higher market area, can the more DC side chopper circuit unit of magnitude setting, by multiple electric power generation unloading resistance consumption/transfer power, and then make DC voltage U
dcreturn to rapidly voltage nominal value scope, thus make wind turbine generator possess certain low voltage ride-through capability (LVRT), its energy relationship and power-balance control specifically can see formula (5).
In sum, for DC voltage U
dcboosting and be not very large from site voltage nominal value side-play amount, and the less demanding market area of interconnection technology, can arrange relatively less DC side chopper circuit unit and consume/transfer power.As can be seen here, the wind turbine generator fault traversing device of the utility model embodiment has the advantage of flexible configuration according to demand, thus the hardware resource of DC side chopper circuit can be fully used.The wind turbine generator fault traversing device that the utility model embodiment provides, by the modularized design to the DC side chopper circuit in current transformer, under the condition not changing original system hardware configuration, the number of DC side chopper circuit unit is correspondingly set neatly according to different grid-connected requirements, rational energy trasfer or consumption can not only be carried out under high/low voltage ride-through state, meet different grid-connected requirement, and reduce hardware cost.
The above; be only embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of described claim.
Claims (4)
1. a wind turbine generator fault traversing device, is characterized in that, described device comprises pusher side current transformer, net side converter, dc-link capacitance and DC side chopper circuit module;
Wherein, described DC side chopper circuit module comprises multiple chopper circuit unit, and described multiple chopper circuit unit is arranged between pusher side current transformer and net side converter, and in parallel with described dc-link capacitance.
2. wind turbine generator fault traversing device according to claim 1, is characterized in that, each described chopper circuit unit comprises IGBT power cell and at least one electric power generation unloading resistance.
3. wind turbine generator fault traversing device according to claim 2, is characterized in that, each described IGBT power cell comprises 2 IGBT.
4. wind turbine generator fault traversing device according to claim 1, is characterized in that, described device also comprises voltage/current observation circuit and operational mode control circuit,
Described voltage/current observation circuit with and site be connected, for the actual measurement three-phase voltage U of detection of grid side
abc, actual measurement three-phase current I
abcwith actual measurement DC bus-bar voltage U
dc;
Described operational mode control circuit is connected between described voltage/current observation circuit and described DC side chopper circuit module, for according to described actual measurement three-phase voltage U
abcwith described actual measurement DC bus-bar voltage U
dcdescribed and the operational mode of site is judged, determines described and site is in high voltage operational mode, normal operation mode or subnormal voltage operation pattern, and according to described in determining and the operational mode of site and actual measurement three-phase voltage U
abc, actual measurement three-phase current I
abcand actual measurement DC bus-bar voltage U
dcto described DC side chopper circuit module sending controling instruction.
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|---|---|---|---|
| CN201420732528.3U CN204179684U (en) | 2014-11-28 | 2014-11-28 | Wind turbine generator fault traversing device |
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|---|---|---|---|
| CN201420732528.3U CN204179684U (en) | 2014-11-28 | 2014-11-28 | Wind turbine generator fault traversing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515052A (en) * | 2016-01-28 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Fault ride-through implementation method and system for direct-driven draught fan |
| CN105610183A (en) * | 2015-12-02 | 2016-05-25 | 成都阜特科技股份有限公司 | Wind power generating set high voltage ride-through control device |
| CN106451558A (en) * | 2016-11-29 | 2017-02-22 | 国网上海市电力公司 | Power network system with large-scale wind power integration |
| WO2017108046A1 (en) * | 2015-12-22 | 2017-06-29 | Vestas Wind Systems A/S | Power dissipation system and control method for a wind turbine power converter |
| US10084371B2 (en) | 2015-09-21 | 2018-09-25 | Abb Schweiz Ag | Multilevel converter with a chopper circuit |
| CN113131510A (en) * | 2020-01-16 | 2021-07-16 | 新疆金风科技股份有限公司 | High voltage ride through control method and system for wind power plant, MMC and machine side converter |
-
2014
- 2014-11-28 CN CN201420732528.3U patent/CN204179684U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10084371B2 (en) | 2015-09-21 | 2018-09-25 | Abb Schweiz Ag | Multilevel converter with a chopper circuit |
| CN105610183A (en) * | 2015-12-02 | 2016-05-25 | 成都阜特科技股份有限公司 | Wind power generating set high voltage ride-through control device |
| CN105610183B (en) * | 2015-12-02 | 2018-09-18 | 成都阜特科技股份有限公司 | A kind of wind power generating set high voltage crossing control device |
| WO2017108046A1 (en) * | 2015-12-22 | 2017-06-29 | Vestas Wind Systems A/S | Power dissipation system and control method for a wind turbine power converter |
| CN105515052A (en) * | 2016-01-28 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Fault ride-through implementation method and system for direct-driven draught fan |
| CN105515052B (en) * | 2016-01-28 | 2018-10-26 | 云南电网有限责任公司电力科学研究院 | A kind of fault traversing realization method and system of straight drive blower |
| CN106451558A (en) * | 2016-11-29 | 2017-02-22 | 国网上海市电力公司 | Power network system with large-scale wind power integration |
| CN113131510A (en) * | 2020-01-16 | 2021-07-16 | 新疆金风科技股份有限公司 | High voltage ride through control method and system for wind power plant, MMC and machine side converter |
| CN113131510B (en) * | 2020-01-16 | 2022-09-27 | 新疆金风科技股份有限公司 | High voltage ride through control method and system for wind power plant, MMC and machine side converter |
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