• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:AT510119A1
    申请号:T0111310
    申请日:2010-07-01
    公开日:2012-01-15
    发明作者:
    申请人:Hehenberger Gerald Dipl Ing；
    IPC主号:
    专利说明:

    • «
    The invention relates to a differential gear for an energy production plant, in particular for a wind turbine, with three inputs or outputs, with a first drive with a drive shaft of the power plant, an output with a connectable to a grid generator and a second drive with an electric machine connected as a differential drive and a method for operating this Diffe rnzia Igetriebes.
    The invention further relates to an energy production plant, in particular a wind turbine, with a drive shaft (2), a connectable to a network (9) 10 generator (13) and a differential gear with three inputs or outputs, wherein a first drive with the drive shaft (2), an output with the generator (13) and a second drive with an electric machine as a differential drive (14) is connected.
    Finally, the invention also relates to a method for operating a differential gear.
    Wind power plants are becoming increasingly important as electricity generation plants. As a result, the percentage of electricity generated by wind is continuously increasing. On the one hand, this means new standards for electricity quality and, on the other hand, a trend towards even larger wind turbines. At the same time, there is a trend towards offshore wind turbines, which require system sizes of at least 5 MW of installed capacity. Due to the high costs for infrastructure and maintenance of the wind turbines in the offshore sector, the availability of the turbines is of particular importance here. 25
    All systems have in common is the need for a variable rotor speed, on the one hand to increase the aerodynamic efficiency in the partial load range and on the other hand to control the torque in the drive train of the wind turbine. The latter for the purpose of speed control of the rotor in combination with the rotor blade adjustment. Currently, therefore, wind turbines are in use, which meet this requirement by using variable-speed generator solutions increasingly in the form of so-called permanent magnet-excited low-voltage synchronous generators in combination with IGBT frequency converters. However, this solution has the disadvantage that (a) the wind turbines can be connected to the medium-voltage network only by means of transformers and (b) the frequency converters required for the variable speed are very powerful and therefore a source of efficiency losses. Alternatively, therefore, so-called differential drives are used lately, which directly connected to the medium-voltage network externally-excited medium-voltage synchronous generators in combination with a differential gear and a 40 auxiliary drive, which preferably a permanent magnet synchronous machine in • t
    Use combination with an IGBT low power frequency converter.
    The AT 507 395 A shows a differential system with an electric servo drive with a permanent magnet synchronous machine in combination with an IGBT-5 frequency converter.
    Due to the gear ratios in the differential gear, however, special precautions have to be taken so that at e.g. Emergency stop of the power generation plant no damaging Überdrehzahien, ie a speed above a predetermined maximum value 10, occur on the differential system. For this purpose, mostly mechanical brakes are used, which prevent overspeed by braking the z.B, differential drive.
    The invention is therefore based on the task of taking appropriate precautions 15 to prevent overspeeding.
    This object is achieved with a differential gear with the features of claim 1 and with an energy recovery system, in particular wind turbine, with the features of claim 17. 20
    This object is further achieved by a method having the features of claim 18.
    In the invention, the electric machine can prevent an overspeed of the second drive 25 in case of failure of a machine-side frequency converter output stage by electric braking using at least one other machine-side frequency converter output stage, whereby a mechanical brake is no longer needed.
    Preferred embodiments of the invention are subject of the dependent claims. 30
    Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
    Fig. 1 shows a wind turbine according to the prior art with an electric drive 35 consisting of permanent-magnet synchronous generator and IGBT frequency converter,
    2 shows the principle of a differential gearbox with an electric differential drive according to the prior art, 40 4 * · "
    3 shows the redundant structure of an electric drive,
    FIG. 4 shows the basic structure of a two-layer single-thread winding, FIG. 5 shows various stator-slot shapes of three-phase machines,
    Fig. 6 shows various structural arrangements of the permanent magnets of permanent magnet three-phase machines, Fig. 7 shows by way of example the course of the braking torque at winding short circuit of the stator of a permanent magnet synchronous machine with Einzahnwicklung and embedded permanent magnet.
    The power of the rotor of a wind turbine is calculated from the formula 15
    Rotor power = Rotor area * Power factor * Air density / 2 * Wind speed3 where the power coefficient depends on the speed of rotation (= blade tip speed to wind speed ratio) of the wind turbine rotor. The rotor 20 of a wind power plant is designed for an optimum power coefficient based on a fast-running number to be determined in the course of the development (usually a value between 7 and 9). For this reason, when operating the wind turbine in the partial load range, a correspondingly low speed must be set in order to ensure optimum aerodynamic efficiency. 25
    Fig. 1 shows the principle of a variable-speed wind turbine according to the prior art with an electric drive with a permanent-magnet synchronous generator and an IGBT frequency converter, which are usually referred to as high-speed full converter systems. A rotor 1 of the wind turbine, which sits on a drive shaft 30 2 for a main gear 3, drives the main gear 3 at. The main transmission 3 is a 3-stage transmission with two planetary stages and a Stimradstufe. Between the main transmission 3 and the generator 6 are a service brake 4 and a clutch 5. The generator 6 - preferably a permanent magnet synchronous generator - is connected via a frequency converter 7 and a transformer 8 to 35 a medium voltage network 9. In the case of an emergency stop, usually the service brake 4 is activated, which is designed such that it can bring the rotor 1 and the entire drive train with main gear 3 and generator 6 to a standstill.
    Fig. 2 shows a possible principle of a differential system for a drehzahivariable 40 wind turbine. The rotor 1 of the wind turbine, which on the drive shaft 2 for the * * · * * * * * * f «» »< · ♦ · «« * * «·« · Λ «·« * ·
    Main gear 3 is seated, drives the main transmission 3 at. The main transmission 3 is a 3-stage transmission with two planetary stages and a spur gear. Between main gear 3 and generator 13 is a differential stage 4, which is driven by the main gear 3 via a planet carrier 10 of the differential stage 4. The generator 13 -5 preferably a foreign-excited synchronous generator, which may also have a rated voltage greater than 20kV if necessary - is connected to a ring gear 11 of the differential stage 4 and is driven by this. A pinion 12 of the differential stage 4 is connected to a differential drive 14. The speed of the differential drive 14 is controlled to ensure one hand at a variable speed of the rotor 1, a constant speed of the generator 10 and on the other hand to regulate the torque in the complete drive train of the wind turbine. In order to increase the input speed for the differential drive 14, a 2-stage differential gear is selected in the case shown, which provides an adjustment gear stage 15 in the form of a spur gear between differential stage 4 and differential drive 14. The differential stage 4 and the 15 adaptation gear stage 15 thus form the 2-stage differential gear. The differential drive 14 is a three-phase machine, which is connected via a frequency converter 16 and a transformer 17 to the medium-voltage network 9.
    When designing differential drives, however, there are important special cases to consider. For example, a failure of the differential drive can cause serious damage. An example is a forced emergency stop of the power generation plant at nominal operation. At the same time the generator is disconnected from the grid and the transmittable torque in the drive train is suddenly at zero. The speed of the rotor of the wind turbine is in this case preferably 25 quickly controlled by a rapid adjustment of the rotor blade adjustment against a speed equal to zero. Due to the relatively high inertia of the generator but this will only slowly reduce its speed. As a result, unless the differential drive can at least partially maintain its torque without delay, an overspeed of the differential drive is unavoidable. 30
    For this reason, e.g. when using hydrostatic differential drives a mechanical brake provided which prevents damaging overspeed in case of failure of the differential drive for the driveline. W02004 / 109157 A1 shows for this purpose a mechanical brake which acts directly on the generator shaft and thus can decelerate the generator accordingly.
    Both the generator 6 according to FIG. 1 and the differential drive 14 according to FIG. 2 are preferably permanent-magnet synchronous machines, but the differential drive 14 can be dimensioned substantially smaller than the generator 6. The same applies 40 analogously to the frequency inverters of both systems. # * 4 * * * * * * * * * * * * * t * 4 * * *
    The power of the differential drive 14 is substantially proportional to the product of percent deviation of the rotor speed from its base speed (usually referred to as "slip") times rotor power. Accordingly, a large speed range basically requires a correspondingly large dimensioning of the differential drive 14. One possibility for expanding the rotational speed range of the rotor of the wind turbine while the slip differential of the differential system is constant, and thus increasing the energy yield, is the utilization of the so-called field weakening range of e.g. a permanent magnet synchronous-10 three-phase machine as an electric differential drive 14th
    Fig. 3 shows the redundant structure of a variable speed electrical machine. By way of example, the differential drive 14 of FIG. 2 is designed as a permanently excited synchronous machine 18 (FIG. 3) with two electrically separate windings, as a rule 15 three-phase windings. Permanent magnets are used in the rotor. It may be advantageous to perform the electric machine not as an internal rotor but as an external rotor, in which case the stator, the permanent magnets and the rotor has the parallel windings, 20 With this synchronous machine 18, two parallel IGBT full bridges 19 are connected, which independently with a controller are adjustable and each provided with capacitors 20 and are connected via DC fuses 21 to a DC intermediate circuit 23. The DC fuses 21 are so far recommended so that in case of a short circuit in a frequency converter 25 power amplifier 22, the DC link is not also short-circuited and thus further operation of the system is impossible.
    These frequency converter output stages 22, essentially consisting essentially of controlled IGBT full bridges 19, controllers, capacitors 20, current measurement and 30 DC fuses 21, can be connected to the required busbar A / C on a common carrier plate, which at the same time a part of the heat sink or with this is connected to be mounted. The cooling in particular of the IGBTs is preferably a water cooling, but can also be designed as air cooling. Said support plate is preferably guided and secured in slide rails. If, in addition, the external power and coolant connections are generally or only partially pluggable, faulty frequency converter output stages 22 can be changed quickly and easily in the event of a fault.
    The DC intermediate circuit 23 is the link for the individual Frequenzum-40 richter output stages 22. To protect the frequency converter against overvoltage is * 4 * * # «4 * 4 ·· * I 4 * 4» »ft« I »« 4 * * 4 * 4 * 4 4 4 · 4 4 4 λ * «4 · 4 Ο here preferably also a so-called brake chopper 24 connected with resistors. This brake chopper 24 can be used at e.g. Power failure also destroy excess energy. 5 In addition, an energy storage 25 is also recommended for energy recovery systems with differential systems. This energy store 25 preferably consists essentially of supercaps connected to the DC intermediate circuit 23. To make the voltage level for the operating range of these supercaps optimal or flexible, they can be connected via DC / DC converter to the DC link 23 10.
    Depending on the operation of the power plant, the energy storage 25 may also take over the function of the brake chopper 24 under certain circumstances. 15 oversized one the mentioned capacitors 20 in the frequency converter output stages 22, so you can replace the energy storage 25 so ideally.
    Between DC intermediate circuit 23 and network 26, the same frequency converter output stages 22 are preferably used. However, these frequency converter output stages 22 20 have different functions to be fulfilled on the network side than the machine-side frequency converter output stages described above.
    In the case of a differential system like. Fig. 2 works this both regenerative and motor. That is, in motor operation, the machine-side 25 frequency converter output stages 22 operate as inverter for speed / torque control and the network-side frequency converter output stages 22 as rectifier modules. Accordingly, suitable controller software is required. In regenerative mode, the frequency converter operates as described above for the high-speed full-frequency converter systems. 30
    In summary, this means for the controller software of the frequency converter output stages 22 that preferably all the functions described are stored on the controller hardware and can be called up automatically according to the required function. This can be predetermined or coordinated by a higher-level controller.
    In order for the line-side frequency converter output stages 22 to meet the power quality criteria required by the grid operator, a so-called LCL filter 27 is to be provided. For redundancy reasons, this can be carried out separately for each line-side frequency converter output stage 22 40. The same applies to fuses 28 and circuit breaker 29.
    Alternatively, LCL filters 27, fuses 28, and power switches 29 can be easily implemented. However, there is no redundancy for these components. In addition, the line-side IGBT full bridges would have to be controlled in parallel, which in practice often leads to unpleasant equalizing currents between the frequency converter stages 22 and thus makes not insignificant power reductions necessary.
    The embodiment in Fig. 3 shows two parallel power strings each having a winding of the electric machine 18 and a machine side, i. 10 generator side, and a network-side frequency converter output stage 22, an LCL filter 27, a fuse 28 and a power switch 29. But it can also be realized a higher number of parallel power lines. In addition, although it makes sense, however, not necessary to keep the number of winding versions of the synchronous machine 18 equal to the number of machine-side 15 frequency converter output stages 22. Preferably, however, the number of
    Winding versions not smaller than the number of machine-side
    Frequency converter output stages 22 are selected in order to avoid the problem already described above of the then parallel to be controlled IGBT full bridges. In order to meet increased requirements for reactive power to be supplied to the grid, e.g. the number of frequency converter output stages 22 is higher on the line side than on the machine side. However, it may also be useful for various reasons to select the number of frequency converter output stages 22 higher on the machine side than the network side. 25
    Due to the redundant design of the winding of the synchronous machine 18 and the frequency converter output stages 22 shown in FIG. 3, at least 50% of the rated torque is still present as a braking torque in case of failure of an output stage, which may also be temporarily exceeded in accordance with the thermal design. In this case, a possible reduction in the IGBT clock frequency additionally helps. The brake chopper 24 and / or the energy store 25 are then preferably designed so that the excess energy can be stored. The mentioned 50% of the nominal torque is usually sufficient to prevent an overspeed of the differential drive, whereby the use of a mechanical brake is no longer required. 35
    Assuming that a short circuit in a frequency converter output stage 22 occurs much more frequently than a winding short circuit, one can do without a multiple execution of the winding without great risk. 40
    In the event of a winding short-circuit or short-circuit of the winding due to a short-circuit in «* * ♦« «* * · ♦ ·· V · ♦ ··« * · »* *« »« * ··· «· ♦ * · # * * * + * "♦ · · *" g * * * * * one of the machine-side IGBT full bridges, the permanent-magnet synchronous machines generate a large braking torque whose size depends on the design of the machines. Thus, in the example according to FIG. 3, one power train would drive, but the other power train would brake and further operation of the system would only be possible with difficulty.
    In the event of a short circuit in one of the frequency converter output stages 22, the short-circuited frequency converter output stage 22 could also be disconnected from the connected winding of the generator via a fuse or a circuit breaker. 10
    In permanent magnet synchronous machines, a large field weakening range can be realized if a) the magnetic flux linkage between rotor and stator has a high asymmetry between the longitudinal and transverse axes and / or b) the leakage inductance in the stator is large (large series inductance). 15
    Both of the above properties can be characterized by constructive measures and thereby an increased field weakening range (up to 3 times the rated speed) with operationally sufficient torque (up to 0.4 times the rated torque) can be achieved. 20
    High leakage inductances are preferably achieved by the use of single-tooth windings with asymmetrical groove / pole pair ratio.
    The single-tooth winding, which makes it possible to produce motors with a small footprint and high efficiency, is characterized in that each winding coil encloses exactly one stator tooth. By comparison, in a distributed winding, each winding coil always encloses several stator teeth. The single-tooth winding can be designed as a single-layer or two-layer winding. FIG. 4 shows by way of example a stator 31 developed into the drawing plane with a two-layered 30 single-toothed winding 33 with nine slots 32 and a rotor 36 with four permanent-magnet pole pairs 35. Stand 31 and rotor 36 are separated by the air gap 34.
    In the case of two electrically separate winding systems (eg, the first winding has the index a and the second winding has the index b), the spatial sequence of the three-phase winding (U, Vs W) would be exemplary in accordance with FIG. 4: Ua, Ub, Va , Vb, Wa, Wb. For the number q of slots per pole (2 * p) and phase (m), the relation q = Q / (2 * p * m) is generally applicable, where Q is the total number of stator slots. q is also referred to as hole number 40. Depending on the ratio Q / (2 * p * m), an unbalanced * * * «
    Flux linkage between rotor and stator. Thus, for the two-layer single-tooth winding exemplified in FIG. 4, Q = 9 and 2 * p = 8. In a 3-phase system, m = 3, and thus q = 3/8. 5 The stray inductance can be increased by narrowed slot slots. In Fig. 5a) a typical stator slot shape 37 is shown as used in distributed windings. The wide slot slot 40 is closed with a slot wedge 39. In Fig. 5b) a possible stator groove shape 38 is shown as it can be used in Einzahnwicklungen. The slot slot 41 is narrowed and does not necessarily have to be closed by a slot key 10 40, as shown in FIG. 5 a. Strongly narrowed slot slots are included
    Einzahnwicklungen relatively easily, since the windings can be introduced in Nutlängsrichtung.
    An asymmetric flux linkage between the rotor 36 and the stator 31 is also achieved by permanent magnets 35 embedded in the rotor 36 or even more strongly embedded in the rotor 36. FIG. 6 schematically shows a section of a rotor 36 developed in the plane of the drawing with various constructional elements Arrangements of the permanent magnets 35 dargestelit. Fig. 6a) shows the magnets 35 constructed on the rotor 31, Fig. 6b) shows in the rotor 31 embedded magnets 35 and Figs. 6c) and 20 6d) show in the rotor 31 embedded magnets 35th
    A further reinforcement of the asymmetric flux linkage can be achieved by constructively set, so-called magnetic flux barriers. In Fig. 6d) the arrangement of the magnetic flux barrier 42 is shown by way of example. The magnetic flux barriers 42 can be realized by inserting a magnetically non-conductive material or in the simplest case by a punched-out space.
    A permanent magnet synchronous machine which is equipped with electrically separated three-phase windings can continue to be operated with partial load 30 in the event of a fault (phase short circuit). It should be noted that the short-circuited winding generates a braking torque. This braking torque is much lower at high stray inductance (as described above).
    FIG. 7 shows, by way of example, the course of the braking torque resulting from a winding short circuit in% of the rated torque as a function of the rotational speed of the synchronous machine. It can be seen at about 20% of the rated speed a peak, which, however, skipped control technology at a speed increase or -reduction. can be passed quickly. In the other speed ranges, the torque settles at about 10% of the nominal torque. The course of the braking torque shown here can be used with changed synchronous machine
    «·» · · + · * · T * · * · * 1CT * * * *
    Parameters deviate more or less from the values shown.
    If, in the example shown, one assumes a system configuration with two parallel frequency converter output stages, the power generation system can largely continue to be operated with 5 approximately 45% of the rated system torque.
    As e.g. Wind turbines are operated over long periods of time in the partial load range, there is an energy yield loss only in the operating range with more than 45% of the nominal torque. Here you can make adjustments to partially achieve higher output power with increased operating speed 10 in this case to 45% limited torque. With a mean annual wind speed at hub height of 7.5 m / s with Rayieigh distribution (this covers a large part of the world's commercially exploitable wind areas), the energy yield loss is statistically only about 1/3 of the 15 energy yield achievable with fully functional plant.
    In principle, it is conceivable in the invention to over-dimension the system insofar as one or more additional power strings are provided, whereby more than 100% of the power required in normal operation is provided by the sum of all power strings. In the event that a power train fails, its power can be taken from a previously unused power train or distributed to the other power strands not fully utilized in normal operation. This is particularly advantageous if the generator is the differential drive of the power generation plant, since the 25 power lines can be dimensioned relatively small in this case and are therefore favorable.
    A further advantage of the single-tooth winding described above is that the error case (phase short circuit) is very unlikely, since the contact of different phases in one groove is very greatly reduced compared to the distributed winding (FIG. 4). In the single-layer single-layer winding, there is no contact at all between different phases in a groove because only one winding (one phase) is ever laid in a groove.
    The embodiments described are only an example and are preferably used in 35 wind turbines, but are also feasible in technically similar applications. This concerns v.a. Hydroelectric power plants to exploit river and ocean currents. For this application, the same basic requirements apply as for wind turbines, namely variable flow rate. The drive shaft is driven in these cases by the driven by the flow medium, such as water, 40 devices directly or indirectly.
    权利要求:
    Claims (21)
    [1]
    «* · R *» 1 »*» < Claims 1. Differential gearbox (4) for an energy production plant, in particular for a wind power plant, with three input and output drives, wherein a first drive with a drive shaft (2) of the power generation plant, an output with a network (9) connectable generator (13) and a second drive with an electric machine (14, 18) as a differential drive (14) is connected, characterized in that at least two machine-side frequency converter output stages (22) are connected to the electric machine (14, 18). 10
    [2]
    2. differential gear (4) according to claim 1, characterized in that the electrical machine (14, 18) has at least two electrically separate windings, each of which is connected to at least one generator-side frequency converter output stage (22). 15
    [3]
    3. differential gear (4) according to claim 1 or 2, characterized in that the winding (s) is designed as a single-tooth winding (s) are (are). 20
    [4]
    4. differential gear (4) according to one of claims 1 to 3, characterized by at least two line-side frequency converter output stages (22).
    [5]
    5. differential gear (4) according to one of claims 1 to 4, characterized in that the generator (6, 14, 18) is a permanent magnet synchronous machine. 25
    [6]
    6. differential gear (4) according to one of claims 1 to 5, characterized in that the frequency converter output stages (22) IGBT full bridges (19).
    [7]
    7. differential gear (4) according to claim 6, characterized in that between the IGBT full bridges (19) and a DC intermediate circuit (23) fuses (21) are arranged.
    [8]
    8. differential gear (4) according to one of claims 1 to 7, characterized 35 characterized in that the frequency converter output stages (22) IGBT full bridges (19), capacitors (20), controllers, and fuses (21), which together a support plate are mounted with a heat sink.
    [9]
    9. differential gear (4) according to claim 7 or 8, characterized in that the electrical connection between the frequency converter output stages (22) and 40 • 9 9 # * * * # * # # # # * * * * * * * « »· + - *» «·« · > · · · · ··· * * ι | 2 ** * »· the DC intermediate circuit (23) can be plugged.
    [10]
    10. differential gear (4) according to one of claims 3 to 9, characterized in that the permanent magnet synchronous machine has embedded permanent magnets.
    [11]
    11. differential gear (4) according to one of claims 1 to 10, characterized in that between a winding and a frequency converter connected end stage (22) a fuse or a circuit breaker is arranged.
    [12]
    12. differential gear (4) according to one of claims 1 to 11, characterized in that one or more additional power strands are provided, whereby more than 100% of the power required in normal operation by the sum of all power strands can be provided.
    [13]
    13. differential gear (4) according to one of claims 1 to 12, characterized in that the number of the generator side provided frequency converter output stages (22) and the network side provided frequency converter output stages (22) is different.
    [14]
    14 differential gear (4) according to one of claims 1 to 13, characterized in that for storing the braking energy, an energy store (25), for example, supercaps, is connected to a DC intermediate circuit (23).
    [15]
    15. differential gear (4) according to one of claims 1 to 14, characterized in that for storing the braking energy, a brake chopper (24) to a DC intermediate circuit (23) is connected.
    [16]
    16. differential gear (4) according to one of claims 1 to 15, characterized in that the electrical machine (14, 18) has an asymmetrical groove / pole pair - ratio.
    [17]
    17. Energy production plant, in particular wind power plant, with a drive shaft (2), one with a network (9) connectable generator (13) and with a differential gear with three inputs or outputs, wherein a first drive to the drive shaft (2), a Output with the generator (13) and a second drive with an electric machine as a differential drive (14) is connected, characterized in that at least two machine-side frequency converter output stages (22) are connected to the electric machine (14, 18).
    [18]
    18. A method for operating a differential gear (4) according to any one of claims 1 to 17, characterized in that the electric machine (14, 18) overspeed of the second drive in case of failure of a machine-side frequency converter output stage (22) by electric braking with the help prevents at least one other machine-side frequency converter output stage (22).
    [19]
    19. The method according to claim 18, characterized in that the electrical machine (14, 18) prevents overspeed of the second drive in case of failure of at least two electrically separate windings by electric braking by means of at least one further electrically separate winding.
    [20]
    20. The method according to claim 18 or 19, characterized in that electrical braking energy in an energy store (25), for example, supercaps, is stored.
    [21]
    21. The method according to any one of claims 18 to 20, characterized in that electrical braking energy in a brake chopper (24) is stored.
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    法律状态:
    2018-03-15| MM01| Lapse because of not paying annual fees|Effective date: 20170701 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1113/2010A|AT510119B1|2010-07-01|2010-07-01|DIFFERENTIAL GEARBOX FOR A WIND POWER PLANT AND METHOD FOR OPERATING THIS DIFFERENTIAL GEARING|ATA1113/2010A| AT510119B1|2010-07-01|2010-07-01|DIFFERENTIAL GEARBOX FOR A WIND POWER PLANT AND METHOD FOR OPERATING THIS DIFFERENTIAL GEARING|
    EP11731301.5A| EP2589141A2|2010-07-01|2011-06-30|Differential transmission for a wind power installation and method for operation of said differential transmission|
    PCT/EP2011/061081| WO2012001138A2|2010-07-01|2011-06-30|Differential transmission for a wind power installation and method for operation of said differential transmission|
    US13/704,360| US20130090203A1|2010-07-01|2011-06-30|Differential transmission for a wind power installation and method for operation of said differential transmission|
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