CN104734197A - Doubly-fed current transformer system and doubly-fed wind power generation unit - Google Patents
Doubly-fed current transformer system and doubly-fed wind power generation unit Download PDFInfo
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- CN104734197A CN104734197A CN201510178192.XA CN201510178192A CN104734197A CN 104734197 A CN104734197 A CN 104734197A CN 201510178192 A CN201510178192 A CN 201510178192A CN 104734197 A CN104734197 A CN 104734197A
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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 invention discloses a doubly-fed current transformer system and a doubly-fed wind power generation unit. The doubly-fed current transformer system comprises a current transformer, a main circuit breaker, a rotor-side switch and a network-side protective device. Turn ratios of rotor windings to stator windings of a doubly-fed power generator matched with the doubly-fed current transformer system are larger than 1, a machine-side converter of the current transformer is connected with the rotor windings of the doubly-fed power generator, a network-side converter is connected with electric collection points of stator and rotor branch circuits, the main circuit breaker is connected onto a main circuit close to the electric collection points of the stator and rotor branch circuits, the network-side protective device is arranged between the network-side converter and the electric collection points of the stator and rotor branch circuits in a connected manner, and the rotor-side switch is arranged between the machine-side converter and the rotor windings of the doubly-fed power generator in a connected manner. The doubly-fed wind power generation unit comprises a tower, a fan, a gear box, the doubly-fed power generator, a transformer, a variable-pitch device, a master controller and the doubly-fed current transformer system. The doubly-fed current transformer system and the doubly-fed wind power generation unit have the advantages that the construction cost of the existing doubly-fed current transformer system and the integral wind power generation unit can be reduced, and the economical efficiency of the system can be improved; the doubly-fed current transformer system and the doubly-fed wind power generation unit are safe and reliable in running and convenient to use.
Description
Technical field
The present invention relates to a kind of converter system for wind power generation, also relate to the double-feedback aerogenerator group using this converter system.
Background technology
As new forms of energy that are clean, renewable, that have great potential, wind power generation obtains swift and violent development in worldwide.MW class wind turbine group mainly contains double-feedback aerogenerator group and total power formula wind turbine generator.As shown in Figure 1, double-feedback aerogenerator group is primarily of compositions such as tower cylinder (not shown), blower fan, gear box, double-fed generator, double-fed type converter system, transformer, vane change device and master controllers.Wherein, transformer primary side connects the external electrical network of high pressure, and pair side connects the internal electric network of low pressure, and double-fed generator and converter system, at blower fan, between gear box and internal electric network, are the core systems realizing energy converting between mechanical and control.
Be illustrated in figure 2 existing double-fed generator and double-fed type converter system.The armature spindle of double-fed generator and blower fan, gear box are mechanically connected, and accept mechanical energy, stator winding, rotor windings all can be fed to electric energy.Double-fed type converter system generally comprises current transformer, net side fuse FU2, stator contactor K1 and main circuit breaker QF0.Wherein current transformer comprises the machine-side converter and grid side converter that are connected by DC bus, is responsible for the power on process doubly-fed generation machine rotor branch road.The stator winding of double-fed generator is connected to the electric Rendezvous Point of rotor branch road by stator contactor K1, the rotor windings of double-fed generator then needs to be connected to the electric Rendezvous Point of rotor branch road by current transformer, and the electric Rendezvous Point of rotor branch road is connected to the internal electric network of double-feedback aerogenerator group again by main circuit breaker QF0.Usually, between the range of speeds that double-fed generator normally runs is 0.8 to 1.2 times of synchronous speed, namely slip is between 0.2 to-0.2, and between the range of speeds that the limit is run is 0.67 to 1.33 times of synchronous speed, namely slip is between 0.33 to-0.33.According to the power relation characteristic of double-fed generator, namely the ratio of rotor processing power and stator processing power is that it runs the absolute value of slip, therefore converter subsystem needs maximum power to be processed to be about 1/4 of system total power.Meanwhile, the rotor port voltage of double-fed generator and the ratio of stator voltage are the product of rotor windings and the no-load voltage ratio of stator winding and the absolute value of double-fed generator actual motion slip.Usually, the rotor windings of double-fed generator and the no-load voltage ratio of stator winding are about 3:1.Like this, on the range of speeds border that the limit of double-fed generator is run (absolute value of corresponding slip is generally 0.33), the rotor port voltage of double-fed generator and the ratio of stator voltage are near 1, and namely now the numerical value of rotor port voltage and stator voltage and internal electric network voltage is suitable.Usual internal electric network is configured to the alternating current that rated value is 690V, and like this, the voltage of the machine-side converter in current transformer and the required process of grid side converter is all in 690V rank.Above-mentioned design, has fully demonstrated the economy advantage of double-feedback aerogenerator group relative to total power formula wind turbine generator.
Above-mentioned existing double-fed type converter system is when double-feedback aerogenerator group is shut down; stator contactor K1 on stator branch road and main circuit breaker QF0 wherein one of at least must disconnect; otherwise the high rotor voltage (can reach 2100V) caused due to the large-slip state (slip is 1) be connected to residing for the double-fed generator in internal electric network is directly applied to converter subsystem; converter subsystem can be damaged, more serious accident even occurs.Because the wind behaviour fluctuation of part wind energy turbine set is comparatively frequent; this can cause wind turbine generator to open machine, shutdown frequently; and often there is limited machinery and the restriction of electrical action number of times in main circuit breaker QF0; therefore main circuit breaker QF0 generally main defencive function when bearing the system failure and maintenance, stator contactor K1 then bears that wind turbine generator normally opens machine, closed, opening operation (now impulse current is often little) when shutting down.Because the action frequency restriction ratio circuit breaker of contactor can exceed a more than order of magnitude, the designed life of system can be ensured like this.
Above-mentioned existing double-fed type converter system is used widely in wind-powered electricity generation industry, but stator contactor K1 wherein, because its rated current is larger, industrially overall consumption is less, production cost is often higher, have impact on the economy of double-fed type converter system and even whole double-feedback aerogenerator group.For 2.0MW double-fed generator and converter system, generally need use the stator contactor of 2100A, its price is large about more than 30,000 yuans at present, and small area analysis contactor can be higher relative to the action frequency restriction of big current contactor.
Summary of the invention
One of the technical problem to be solved in the present invention is, provides a kind of double-fed type converter system, overcomes existing stator contactor cost high, affects the defect of converter system and even whole wind turbine generator economy.
Two of the technical problem to be solved in the present invention is, provides a kind of double-feedback aerogenerator group, overcomes existing stator contactor cost high, affects the defect of wind turbine generator economy.
The present invention solves the technical scheme that one of its technical problem adopts: construct a kind of double-fed type converter system, comprise current transformer, main circuit breaker and net side protective device;
This current transformer comprises the machine-side converter and grid side converter that are connected by DC bus, and this machine-side converter connects the rotor windings of double-fed generator, and this grid side converter connects the electric Rendezvous Point of rotor branch road;
This main circuit breaker be connected to the electric Rendezvous Point of rotor branch road near internal electric network side main circuit on;
This net side protective device is connected between this grid side converter and the electric Rendezvous Point of this rotor branch road;
The rotor windings of double-fed generator supporting with described double-fed type converter system and the turn ratio of stator winding are greater than 1;
It is characterized in that, this double-fed type converter system also comprises rotor-side switch, and this rotor-side switch is connected between this machine-side converter and rotor windings of double-fed generator.
In double-fed type converter system of the present invention, described net side protective device is circuit breaker or fuse.
In double-fed type converter system of the present invention, comprise capacitance group, this capacitance group is star connection or delta connection, is connected on the three-phase line between the electric Rendezvous Point of described rotor branch road and the stator winding of double-fed generator.
In double-fed type converter system of the present invention, described rotor-side switch is contactor or thyristor switch.
The present invention solves the technical scheme that its technical problem two adopts: construct a kind of double-feedback aerogenerator group, comprise tower cylinder, blower fan, gear box, double-fed generator, converter system, transformer, vane change device and master controller; The rotor windings of this double-fed generator and the turn ratio of stator winding are greater than 1; This converter system comprises current transformer, main circuit breaker and net side protective device;
This current transformer comprises the machine-side converter and grid side converter that are connected by DC bus, and this machine-side converter connects the rotor windings of double-fed generator, and this grid side converter connects the electric Rendezvous Point of rotor branch road;
This main circuit breaker is connected to the electric Rendezvous Point of rotor branch road on the main circuit of internal electric network side;
This net side protective device is connected between this grid side converter and the electric Rendezvous Point of this rotor branch road;
It is characterized in that, this double-fed type converter system also comprises rotor-side switch, and this rotor-side switch is connected between this machine-side converter and rotor windings of double-fed generator.
In double-feedback aerogenerator group of the present invention, described net side protective device is circuit breaker or fuse.
In double-feedback aerogenerator group of the present invention, comprise capacitance group, this capacitance group is star connection or delta connection, is connected on the three-phase line between the electric Rendezvous Point of described rotor branch road and the stator winding of double-fed generator.
In double-feedback aerogenerator group of the present invention, described rotor-side switch is contactor or thyristor switch.
Implement double-fed type converter system of the present invention and double-feedback aerogenerator group, compared with the prior art, its beneficial effect is:
1. for double-feedback aerogenerator group, in converter system, between the machine-side converter of current transformer and the rotor windings of double-fed generator, rotor-side switch is set, because current transformer needs maximum power to be processed to be only about 1/4 of system total power, therefore the switching current grade be arranged on the rotor branch road of double-fed generator is much smaller than the switching current grade be arranged on doubly-fed generation machine stator branch road, making the present invention be arranged on the switch price of generator amature side will far below the switch price being arranged on generator unit stator side, thus reduce the construction cost of existing converter system and whole wind turbine generator, improve system economy, for 2.0MW double-fed type converter system, its rotor-side rated current can reach 520A, the rotor contact device of 630A can be used, its price is at present at about 0.5 ten thousand yuan, and the price of the stator contactor of the 2100A that existing system generally need adopt is greatly about more than 30,000 yuan, and small area analysis contactor can be higher relative to the action frequency restriction of big current contactor, therefore its economy is appreciable,
2. system cloud gray model is safe and reliable; realized the connecting and disconnecting of current transformer and double-fed generator by the rotor-side switch on the road of the rotor arranged when wind turbine generator normally opens machine, shutdown; then can be realized disconnecting with the safety of electrical network by main circuit breaker when system overhaul, easy to use.
Accompanying drawing explanation
Fig. 1 is double-feedback aerogenerator group basic composition structural representation.
Fig. 2 is the structural representation that existing double-fed type converter system adds double-fed generator.
Fig. 3 is the structural representation that double-fed type converter system of the present invention adds double-fed generator.
Fig. 4 is the structural representation that double-fed type converter system embodiment one of the present invention adds double-fed generator.
Fig. 5 is the structural representation that double-fed type converter system embodiment two of the present invention adds double-fed generator.
Fig. 6 is the structural representation that double-fed type converter system embodiment three of the present invention adds double-fed generator.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 3, double-fed type converter system of the present invention comprises current transformer, main circuit breaker 10 (QF0), net side protective device 16 and rotor-side switch 12.The rotor windings of double-fed generator 100 supporting with double-fed type converter system and the turn ratio of stator winding are greater than 1.
Current transformer comprises the machine-side converter 13 and grid side converter 15 that are connected by DC bus 14, and this machine-side converter 13 connects the rotor windings of double-fed generator 100, and grid side converter 15 connects the electric Rendezvous Point 11 of rotor branch road.
Main circuit breaker 10 is connected to the electric Rendezvous Point 11 of rotor branch road of double-fed generator 100 on the main circuit of internal electric network side.
Net side protective device 16 is connected between grid side converter 15 and the electric Rendezvous Point 11 of rotor branch road.
Rotor-side switch 12 is connected between this machine-side converter and rotor windings of double-fed generator.
Embodiment one
As shown in Figure 4, in the present embodiment, rotor-side switch 12 adopts rotor contact device 121 (K2), and net side protective device 16 adopts net side fuse 161.
By action rotor contact device 121; can reach double-feedback aerogenerator group normally open in machine, stopping process eliminate high induction voltage that double-fed generator large-slip state may cause on double-fed type converter system in the impact of machine-side converter and grid side converter, weaken the action demand to main circuit breaker 10.Action frequency restriction because of contactor is generally far longer than the action frequency restriction of circuit breaker, thus ensures the designed life of double-fed generator and converter system.
Certainly, in the orderly closedown process of double-feedback aerogenerator group, also can according to application characteristic (as comparatively stable in site wind, wind turbine generator is without the need to the wind energy turbine set of frequent start-stop) each all to as described in main circuit breaker 10 perform unconditional opening operation; Or system can shut down the features such as frequency, downtime duration or breaker actuation number of times record to the opening operation of described electing property of main circuit breaker 10 according to reality.
In other embodiments, netting side fuse 161 can adopt net side circuit breaker 162 to replace.
Embodiment two
As shown in Figure 5, in the present embodiment, rotor-side switch 12 adopts rotor contact device 121, and net side protective device 16 adopts net side fuse 161.
In other embodiments, netting side fuse 161 can adopt net side circuit breaker 162 to replace.
The present embodiment is also provided with capacitance group 17, and this capacitance group adopts star connection, is connected on the three-phase line between the electric Rendezvous Point 11 of rotor branch road and the stator winding of double-fed generator 100.
Described capacitance group 17 being articulated in the capacity current produced after on the three-phase line between the electric Rendezvous Point of rotor branch road 11 and the stator winding of double-fed generator 100 is designed to suitable with described double-fed generator stator side exciting current; like this; following technique effect can be reached: after double-feedback aerogenerator group orderly closedown; disconnect rotor contact device 121; main circuit breaker 10 can be kept to close; the capacity current basic neutralisation that the exciting current that now stator winding of double-fed generator is asked for can be produced by capacitance group, thus substantially additional effect is not produced to external system.
In addition; after wind turbine generator orderly closedown, grid side converter also can be kept to maintain and to run, allow it export a certain amount of capacitive reactive power electric current; the capacity current that the above-mentioned capacitance group of all or part of replacement produces, equally for exciting current that the stator winding of offsetting double-fed generator is asked for.
In other embodiments, the capacitance group 17 of star connection can adopt the capacitance group of delta connection to replace.
Embodiment three
As shown in Figure 6, in the present embodiment, rotor-side switch 12 adopts rotor thyristor switch 122 (T2), and net side protective device 16 adopts net side fuse 162.
Because doubly-fed generation machine rotor branch current is generally about 1/3 of stator side branch current, therefore adopt the three-phase bidirectional switch be made up of thyristor inverse parallel, the present embodiment can reach the technique effect similar with embodiment one and economic benefit.
In other embodiments, rotor-side switch 12 can adopt other can the switch of frequent movement.
In other embodiments, netting side fuse 162 can adopt net side circuit breaker 161 to replace.
In other embodiments, also can arrange capacitance group, capacitance group adopts star connection, on the three-phase line between the stator winding being connected to main circuit breaker 10 and double-fed generator 100.
In other embodiments, the capacitance group of star connection can adopt the capacitance group of delta connection to replace.
Double-feedback aerogenerator group of the present invention comprises tower cylinder, blower fan, gear box, double-fed generator, converter system, transformer, vane change device and master controller.The annexation of tower cylinder, blower fan, gear box, double-fed generator, converter system, transformer, vane change device and master controller is prior art, converter system adopts the double-fed type converter system of the invention described above, its structure and conversion thereof, as above-mentioned, do not repeat them here.
Claims (10)
1. a double-fed type converter system, comprises current transformer, main circuit breaker and net side protective device;
This current transformer comprises the machine-side converter and grid side converter that are connected by DC bus, and this machine-side converter connects the rotor windings of double-fed generator, and this grid side converter connects the electric Rendezvous Point of rotor branch road;
This main circuit breaker be connected to the electric Rendezvous Point of rotor branch road near internal electric network side main circuit on;
This net side protective device is connected between this grid side converter and the electric Rendezvous Point of this rotor branch road;
The rotor windings of double-fed generator supporting with described double-fed type converter system and the turn ratio of stator winding are greater than 1;
It is characterized in that, this double-fed type converter system also comprises rotor-side switch, and this rotor-side switch is connected between this machine-side converter and rotor windings of double-fed generator.
2. double-fed type converter system as claimed in claim 1, it is characterized in that, described net side protective device is circuit breaker or fuse.
3. double-fed type converter system as claimed in claim 1, it is characterized in that, comprise capacitance group, this capacitance group is star connection or delta connection, is connected on the three-phase line between the electric Rendezvous Point of described rotor branch road and the stator winding of double-fed generator.
4. double-fed type converter system as claimed in claim 2, it is characterized in that, comprise capacitance group, this capacitance group is star connection or delta connection, is connected on the three-phase line between the electric Rendezvous Point of described rotor branch road and the stator winding of double-fed generator.
5. the double-fed type converter system as described in one of Claims 1-4, is characterized in that, described rotor-side switch is contactor or thyristor switch.
6. a double-feedback aerogenerator group, comprises tower cylinder, blower fan, gear box, double-fed generator, converter system, transformer, vane change device and master controller; The rotor windings of this double-fed generator and the turn ratio of stator winding are greater than 1; This converter system comprises current transformer, main circuit breaker and net side protective device;
This current transformer comprises the machine-side converter and grid side converter that are connected by DC bus, and this machine-side converter connects the rotor windings of double-fed generator, and this grid side converter connects the electric Rendezvous Point of rotor branch road;
This main circuit breaker is connected to the electric Rendezvous Point of rotor branch road on the main circuit of internal electric network side;
This net side protective device is connected between this grid side converter and the electric Rendezvous Point of this rotor branch road;
It is characterized in that, this double-fed type converter system also comprises rotor-side switch, and this rotor-side switch is connected between this machine-side converter and rotor windings of double-fed generator.
7. double-feedback aerogenerator group as claimed in claim 6, it is characterized in that, described net side protective device is circuit breaker or fuse.
8. double-feedback aerogenerator group as claimed in claim 6, it is characterized in that, comprise capacitance group, this capacitance group is star connection or delta connection, is connected on the three-phase line between the electric Rendezvous Point of described rotor branch road and the stator winding of double-fed generator.
9. double-feedback aerogenerator group as claimed in claim 7, it is characterized in that, comprise capacitance group, this capacitance group is star connection or delta connection, is connected on the three-phase line between the electric Rendezvous Point of described rotor branch road and the stator winding of double-fed generator.
10. the double-feedback aerogenerator group as described in one of claim 6 to 9, is characterized in that, described rotor-side switch is contactor or thyristor switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510178192.XA CN104734197A (en) | 2015-04-15 | 2015-04-15 | Doubly-fed current transformer system and doubly-fed wind power generation unit |
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| CN201510178192.XA CN104734197A (en) | 2015-04-15 | 2015-04-15 | Doubly-fed current transformer system and doubly-fed wind power generation unit |
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| CN110289636A (en) * | 2019-06-28 | 2019-09-27 | 东方电气风电有限公司 | It is a kind of based on frequency dividing/low frequency operation of power networks direct-drive type double-fed wind power generator group |
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