• 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:
    generator torque control method. a wind turbine typically includes a generator and a mechanical rotation system having a natural period. the present invention relates to a method for controlling the torque of the generator and which minimizes oscillations in the speed of the generator rotor. in the event of grid failure or transient failure, or a failure in the power converter, the torque of the generator is reduced at a substantially constant rate over time as shown in the graph (c). the rate at which the generator torque is reduced is proportional to the estimated nominal torque of the generator and inversely proportional to the entire multiple of the natural period of the mechanical rotation system.
    公开号:BR112013000240B1
    申请号:R112013000240-9
    申请日:2011-07-06
    公开日:2020-12-15
    发明作者:Dominic David Banham-Hall；Gareth Anthony Taylor；Christopher Alan Smith
    申请人:Ge Energy Power Conversion Technology Ltd；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention relates to methods of controlling the torque of the generator, and especially to methods for controlling the torque in the generator of a wind turbine during a fault condition. BACKGROUND OF THE INVENTION
    [002] It is possible to convert wind power into electrical power using a wind turbine to drive a generator's rotor, either directly or through a gearbox. The AC frequency that is developed at the generator's stator terminals (the “stator voltage”) is directly proportional to the rotor rotation speed. The voltage at the generator terminals also varies as a function of the speed and, depending on the specific type of the generator, the flow level. For optimal energy capture, the speed of rotation on the output shaft to that of the wind turbine will vary according to the wind speed that drives the turbine blades. To limit power capture to high wind speeds, the rotation speed of the output shaft is controlled by changing the angle of inclination of the turbine blades. The variable voltage and frequency of the generator can be adapted to the nominally fixed frequency and the frequency of the supply network, using a power converter.
    [003] A typical wind turbine with a power converter set is shown in Figure 1. The power converter is used to form an interface between wind turbine 2 that drives a variable speed AC generator 4 and a supply network (called NETWORK). The wind turbine typically includes three turbine blades mounted on an axis of rotation and whose tilt angle can be controlled by means of a tilt angle actuator. A gearbox 8 is used to connect the rotation axis to the generator rotor 4. In some cases, the rotation axis can be connected directly to the generator rotor.
    [004] The terminals of generator 4 are connected to the AC terminals of a three-phase generator bridge 10 which in normal operation operates as an active rectifier to supply power to a DC link 12. The generator bridge 10 has a two-level topology conventional three-phase with a series of semiconductor power switching devices fully controlled and regulated using a pulse width modulation (PWM) strategy. However, in practice, the generator bridge 10 can have any suitable topology such as a three-level stapled neutral point topology or a many-level topology (Foch-Maynard arrangement, for example).
    [005] The DC output voltage of the generator bridge 10 is introduced at the DC terminals of a network bridge 14 which in normal operation operates as an inverter. The network bridge 14 has a similar three-phase two-level topology to that of the generator bridge 10 with a series of semiconductor power switching devices fully controlled and regulated using a PWM strategy. However, in practice, the network bridge 14 can have any suitable topology, as discussed above for the generator bridge 10.
    [006] The generator bridge 10 is controlled by a generator bridge controller 20 and the network bridge 14 is controlled by a network bridge controller 22. Physically, the control system can reside within the same physical equipment and consist of in a separation only inside the software.
    [007] The AC output voltage of the mains bridge 14 is filtered through a mains filter before being supplied to the supply network via a main transformer 6. The distributor protector (not shown) can be included to provide a reliable connection to the supply network and to isolate the generator system from the supply network for various operational and non-operational requirements.
    [008] Sudden changes in the generator torque can cause serious mechanical oscillations in the wind turbine's traction unit. Such changes can occur during a grid failure in which the inability to export power to the supply network results in a virtually simultaneous step reduction in generator torque, or as a result of a failure in the power converter. The magnitude of the mechanical oscillations is directly proportional to the magnitude of the step reduction in the torque of the generator. In some cases, the turbine assembly and drive train can be physically designed and built to withstand these mechanical oscillations without the need for any other protection. However, mechanical oscillations can be kept within acceptable limits, allowing at least part of the power that cannot be exported into the supply network to be absorbed in a dynamic braking resistor (DBR) 16 that it is connected in series with a suitable actuator 18 or with the distributor (a semiconductor switching device, for example, such as a FET or an IGBT which is sometimes referred to as a “chopper”) via the DC link 12. When the voltage of the dc link rises above a threshold in response to a fault condition, then actuator 18 is controlled by a chopper controller 24 to produce a short circuit of dc link 12 so that the power that is exported from generator 4 be absorbed by DBR 16. The power that is absorbed by DBR 16 due to the fault condition is the total power absorbed and is dissipated in the form of heat. The DBR 116 can have any suitable physical construction and can be cooled by water or pore, for example.
    [009] If DBR 16 is partially estimated then only part of the generator's power is absorbed by DBR. In this situation, the torque of the generator will still be reduced in step, but it will be of a smaller magnitude when compared to an arrangement in which no DBR is foreseen. The magnitude of the mechanical oscillations in the drive unit will therefore be reduced accordingly. If DBR 16 is fully estimated, then the entire generator power is absorbed by the DBR until that moment when generator 4 can start exporting power to the supply network. Conventionally this can mean that the DBR 15 is estimated to accept the full generator power for one second or more. If the DBR 16 is fully estimated, then the torque of the generator will not be stepped down and there is nothing to excite the mechanical oscillations in the drive.
    [010] The difference in the torque response of the generator to an arrangement where there is no DBR and an arrangement in which a fully estimated DBR 16 is expected across the CC 12 link is shown in Figures 2A and 2B. Each figure includes a series of seven graphs labeled (a) to (g) showing how the following operating parameters for the wind turbine and power converter set in Figure 1 vary in a pu or “per unit” system during a power failure. grid when the grid voltage in the supply network drops to zero for one second: Graph (a) - grid voltage (or supply voltage). Graph (b) - speed of the generator rotor. Graph (c) - generator torque. Graph (d) - amount of power that is exported to the supply network through the network bridge 14. Graph (e) - the amount of power that is exported from generator 4 to link CC 12 through the generator bridge 10. Graph (f) - the amount of generator power that is absorbed by DBR5 16. Graph (g) - the amount of power that is absorbed by DBR 16.
    [011] It can be seen from the graphs (a) of Figures 2A and 2B that the grid voltage undergoes a step reduction from 1 to 0 at time t = 65 x, remains at 0 for one second and recovers with an increase in step from 0 to 1 at time t = 66 s. Grid codes typically require that the wind turbine remain connected to the supply network during grid failures or transients. In other words, the wind turbine and the power converter assembly must normally have some capacity to pass through the grid failure or low voltage. During such grid failures or transients, the generator is unable to export power to the supply network. The graphs (d) of Figures 2A and 2B, therefore, show that the power that is exported to the supply network undergoes a step reduction from 1 to 0 at time t = 65 s, remains at 0 for one second and then from a small surge at time t = 66 s, it starts to increase at a constant rate at time t = 66s when the grid voltage has recovered.
    [012] In the arrangement where there is no DBR, then the graph (c) of Figure 2A shows that the torque of the generator is stepped down from 11 to 0 at time t = 65 x, remains at 0 for one second and it starts to increase at a constant rate at time t = 66 s when the grid voltage has recovered. The graph (b) of Figure 2A shows how the step reduction in the torque of the generator at time t = 65 x produces significant fluctuations in the speed of the generator rotor. The inability to export power to the supply network during grid failure also causes the generator rotor speed to rise to a peak speed at approximately t - 66.5 s before gradually starting to decrease.
    [013] The graph (e) of Figure 2A shows that the amount of power that is exported from the generated to the he CC also undergoes a step reduction from 1 to 0 at time t = 65 s, continues at 0 for one second and it starts to increase at a constant rate at time t = 66 s when the grid voltage has recovered.
    [014] In the arrangement in which the actuator 18 is controlled at time t = 65 s to make the link dc 12 short-circuited, so that the power that is exported from generator 4 to the link through the generator bridge 10 is absorbed by the fully estimated DBR 16 then the graph (f) of Figure 2B shows that the power that is absorbed by the DBR undergoes a step increase at time t = 65 s. All generator power is absorbed by DBR 16 until time t = 66 s when the grid voltage has recovered and the power can be exported to the supply network again. At time t = 66 s the power that is absorbed by DBR 16 starts to decrease at a constant rate. Graph (g) shows the total amount of energy that is absorbed by DBR 16. It will be easy to see that energy is the total amount of absorbed power shown in graph (f). The energy is absorbed at a constant rate between times t = 65 s and t = 66 s since the DBR 16 absorbs all the generator power for the duration of the grid failure. The rate at which energy is absorbed begins to be reduced at time t = 66 s as the power that is absorbed by DBR 16 begins to be reduced at a constant rate and the graph (g) eventually shows a constant value at time of approximately t = 66.4 s which represents the total amount of energy that was absorbed by the DBR as a result of grid failure.
    [015] As the total power of the generator is absorbed by DBR 16 during grid failure, the torque of the generator and the amount of power that is exported from generator 4 remain substantially constant. There is no significant fluctuation in the speed of the generator rotor, nor any gradual increase in speed. The use of a fully estimated DBR therefore provides useful protection and avoids the problems that occur when the torque of the generator is allowed to be stepped down. Although the graphs for a partially estimated DBR are not shown, it can be easily seen that they will show a variation in the operational parameters of the wind turbine and the power converter set that is found somewhere between these shown in Figures 2A and 2B. In other words, the torque of the generator will undergo a step reduction, but the magnitude of the step reduction and the magnitude of the oscillations resulting in the generator rotor speed will depend on the partial DBR estimate compared to a full nominal estimate. DESCRIPTION OF THE INVENTION
    [016] The present invention proposes an improved method of controlling the torque of the generator during a fault condition (such as a grid failure or a transient, in which the supply network suffers a voltage drop or a failure in the power converter that connected to the generator of the wind turbine assembly). More specifically in a wind turbine comprising a generator and a mechanical rotation system that has a natural period Tn, including the method of controlling the torque of the generator the step of reducing the torque of the generator during a fault condition at a substantially higher rate constant with respect to time t according to the equation:
    where: estimated_ torque is the estimated nominal torque of the generator (4), n is an integer, and c is a constant (which can optionally be zero),
    [017] The estimated nominal torque of the generator will normally be defined as the torque of the generator at the estimated output power and with a generator speed equal to the estimated nominal speed, that is: estimated_ torque = (estimated_power / estimated_speed)
    [018] If the torque of the generator is thereby reduced, then the absolute magnitude of any mechanical oscillations in the mechanical rotation system can be significantly reduced to zero or substantially zero.
    [019] In a vector control system then the torque of the generator can be reduced by imposing ramp rate limits suitable to the actual current controller that is part of the controller for the generator bridge, for example. The ramp rate limits can be applied to a torque reference and / or a torque axis current reference.
    [020] The wind turbine's mechanical rotation system may include a turbine assembly that has at least one turbine blade (three would be typical), a generator rotor assembly, and any (any) associated drive shaft (s) ( s). In the case of a non-direct drive wind turbine, the mechanical rotation system may also include a gearbox that is provided between the turbine assembly and the generator rotor assembly. The mechanical rotation system can therefore be considered in terms of a two-mass, spring and damper system in which the turbine assembly is separated from the generator rotor assembly by at least one stiffness shaft (and optional gearbox) finite damping. The natural period Tn for any mechanical rotation system can be determined or calculated from parameters such as shaft stiffness, damping, blade inertia and generator inertia.
    [021] The tilt angle of at least one turbine blade can be changed or adjusted under the control of a tilt angle actuator. The method can therefore also include the step of changing the angle of inclination of at least one turbine blade to minimize the peak speed of the generator during a fault condition. In other words, the angle of inclination of at least one turbine blade can be changed in such a way that the turbine assembly captures less wind and any increase in the speed of rotation of the output shaft (and, consequently, of the assembly) generator) as a result of minimizing the fault condition. The angle of inclination of the at least one turbine blade can be varied as soon as a fault condition is detected or at any other time.
    [022] The generator torque can be reduced as soon as a fault condition is detected. Alternatively, the generator torque can be kept substantially constant (such as the estimated nominal generator torque or the generator torque immediately before the fault condition appears) for a period of time before it has been reduced. More specifically, the torque of the generator can be kept substantially constant for a predetermined period of time while the tilt angle of the at least one turbine blade is changed or adjusted by the tilt angle actuator.
    [023] Typically the generator is connected to a power converter that interfaces with the generator to a supply network or power grid. The power converter can have any suitable topology, but in an arrangement it includes a generator bridge connected to a network bridge by a DC link. The estimate of the DBR and the associated actuator or distributor can be significantly reduced if the torque of the generator is reduced to a substantially constant rate as described above. This is due to the fact that the energy flow into the DBR can be quickly reduced, thus ensuring that the total amount of energy that is absorbed by the DBR as a result of the fault condition is minimized. The DBR may have a lower estimate than would be the case for a conventional wind turbine and power converter set in which the generator power is absorbed during the entire fault condition. This means that the DBR can be made physically smaller and the cooling requirements are significantly reduced leading to cost savings.
    [024] The method is especially important for wind turbines that have permanent magnetic generators (PMGs) where the peak speed of the generator is critical for estimating the voltage of the power converter and where the transients due to mechanical oscillations in the mechanical system of rotation or drive can exceed those resulting from the acceleration of the turbine. PMGs typically have direct drive arrangements or low speed ratios and so the natural period of their mechanical rotation systems is often shorter than that of other types of wind turbines.
    [025] The present invention also proposes a wind turbine comprising: a generator; a mechanical rotation system having a natural period Tn, the mechanical rotation system including a turbine assembly that has at least one turbine blade, a generator rotor assembly and any associated motor shaft (s) (s); and a power converter; the power converter being controlled to reduce the torque of the generator during a fault condition at a substantially constant rate in relation to time t according to EQ1.
    [026] The turbine assembly may include a tilt angle actuator that is controlled to change the tilt angle of at least one turbine blade to minimize the peak speed of the generator during a fault condition. The power converter can have any suitable topology, but in one arrangement it includes a generator bridge that is controlled by a generator bridge controller to reduce the torque of the generator during a fault condition at a substantially constant rate by imposing power limits. ramp rate to a torque reference and / or a torque axis current reference that is used by the generator bridge controller. BRIEF DESCRIPTION OF THE DRAWINGS
    [027] Figure 1 is a schematic drawing of a wind turbine and a power converter arrangement; Figures 2A to 21D are a series of graphs (a) to (g) showing how the operational parameters of the wind turbine and the power converter set in Figure vary in certain situations; and Figure 3 is a schematic control diagram for the wind turbine and the power converter arrangement of Figure 1 according to the present invention. DESCRIPTION OF ACCOMPLISHMENTS OF THE INVENTION
    [028] The torque control method of the generator of the present invention will be better understood with reference to Figures 2C and 2D. Each figure includes a series of seven graphs labeled (a) to (g) as described above and showing how the operating parameters of the wind turbine and the power converter set in Figure 1 vary in a pu or 'per unit' system during a grid failure where the grid voltage in the supply network drops to zero for one second. Figure 2C shows how the operating parameters vary in a situation where the generator torque is reduced as soon as the grid failure is detected. Figure 2D shows how the same operating parameters vary in a situation where the torque of the generator is kept substantially constant for 0.5 s before reducing it.
    [029] It can be seen from the graphs (a) of Figures 2C and 2D that the grid voltage undergoes a step reduction from 1 to 0 at time t = 65 s, remains at 0 for one second and recovers with an increase in step from 0 to 1 at time t - 66 s. For the reasons discussed above, the graphs (d) of Figures 2C and 2D show that the energy that is exported to the supply network therefore undergoes a step reduction from 1 to 0 at time t - 65 s, remains at 0 for one second and, after a small surge, at time t - 66 s, it starts to increase at a constant rate at time t - 66s when the grid voltage has recovered.
    [030] In both situations, actuator 18 is controlled at time t - 65 s to produce a short circuit in link DC 12, so that the generator power is absorbed by DBR 116.
    [031] The graph (c) of Figure 2C shows that the torque of the generator begins to decrease at a constant rate at time t - 65 s, remains at 0 and begins to increase at a constant rate at time t = 66 s, when the grid tension recovers. The constant rate at which the generator torque is reduced is determined by equation E11 and is related to the estimated nominal torque of generator 4 and the natural period Tn of the wind turbine's mechanical rotation system that includes the turbine assembly, the rotor generator and associated driving axles. Graph (b) in Figure 2C shows how the speed of the generator rotor increases to a peak speed at approximately t = 66.5 s before gradually starting to decrease. Due to the reduction in torque (or slope reduction), there is no significant oscillation in the rotor speed.
    [032] The graph (e) of Figure 2C shows that the amount of power that is exported from generator 4 to link CC 12 begins to reduce at a constant rate at time t = 65 s aligned with the reduction in the generator torque, remains at 00 and starts to increase at a constant rate at time t = 66 when the grid voltage is restored.
    [033] The graph (f) of Figure 2C shows that the power that is absorbed by the DBR undergoes a step increase at time t = 65 s. All generator power is absorbed by DBR 16 until time t = 66 s when the grid voltage recovers and the power can again be exported to the supply network. However, it can be easily observed that, contrary to the situation shown in Figure 2B, in which the generator power remains substantially constant during grid failure, as there is no reduction in the generator torque, in this case the amount of power that is exported. from generator 4 to link CC 12 begins to decrease at a constant rate at time t = 65 if it reaches 0 approximately at time t = 65.4 s. This means that from time t = 65 s there is a decreasing amount of generator power for DBR 16 to absorb, and from time t = 65.4 there is absolutely no generator power to absorb.
    [034] The graph (g) of figure 2C shows the total amount of energy that is absorbed by DBR 16 as a result of the grid failure. The constant value that represents the total amount of energy that was absorbed by DBR 16 is considerably lower than that shown in the graph (g) of Figure 2B where the fully estimated DBR absorbs all the generator's power for the entire duration of the grid failure.
    [035] Graph (c) of Figure 2D shows that the generator torque is kept substantially constant for 0.5 s after the grid failure has been detected and only starts to decrease at a constant rate at time t = 65, 5 s. This could allow time to vary the tilt angle of the turbine blades through a tilt angle actuator to minimize peak generator speed, for example. The generator torque remains at 0 and starts to increase at a constant rate at time t = 66s when the grid voltage recovers. The constant rate at which the generator torque is reduced is determined by the equation EQ1 and is related to the estimated nominal torque of generator 4 and the natural period Tn of the mechanical rotation system of the wind turbine that includes the turbine assembly, the rotor of the wind turbine. generator and associated driving axles. The rate at which the generator torque is reduced is the same for the alternative situations shown in Figures 2C and 2D, since the rate depends on physical parameters of the specific wind turbine system and not on the moment when the generator torque starts to reduce during a fault condition. Graph (b) of Figure 2D shows how the speed of the generator rotor increases to a peak speed at approximately t = 66.5 s before gradually starting to decrease. Due to the reduction in torque, there is no significant oscillation in the rotor speed.
    [036] Graph (e) of Figure 2D shows that the amount of power that is exported from generator 4 to link DC 12 remains at the estimated output power for 0.5 s after the grid failure has been detected and only begins to reduce at a constant rate at time t = 65.5 s in line with the reduction in generator torque. The generator power remains at 0 and starts to increase at a constant rate at time t = 66 x when the grid voltage recovers.
    [037] The graph (f) of Figure 2D shows that the power that is absorbed by the DBR over a step increase at time t = 65 s. All power from the generator is absorbed by DBR 16 until time t = 66S when the grid voltage recovers and the power can again be exported to the supply network. However, it can be easily observed that, contrary to the situation shown in Figure 2B, in which the generator power remains substantially constant during grid failure, as there is no reduction in the generator torque, in this case the amount of power that is exported from generator 4 to link 12 it starts to decrease at a constant rate at time t = 65.5 and reaches 0 approximately at time t = 69.4 s. This means that from instant t = 65.5 there is a decreasing amount of generator power for DBR 16 to absorb, and there is absolutely no generator power to absorb from instant t = 65.9 s.
    [038] The graph (g) of Figure 2D shows the total amount of energy that is absorbed by DBR 16 as a result of the grid failure. The constant value that represents the total amount of energy that was absorbed by the DBR 16 is considerably less than the total amount shown in the graph (g) of Figure 2B in which the fully estimated DBR absorbs all the generator power during the entire duration of the grid. However, the constant value shown in the graph (g) of Figure 2D is greater than the total amount shown in the graph (g) of Figure 2C in which the generator torque is reduced as soon as the grid failure is detected.
    [039] Figure 3 shows a schematic control diagram for the wind turbine and power converter set in Figure 1. Generator 4 is a permanent magnetic generator (PMG). The series of semiconductor power switching devices on the generator bridge 10 is fully controlled and regulated using a pulse width modulation (PWM) strategy by the generator bridge controller 20. The generator bridge controller 20 uses the vector control in which, in this example, torque control occurs on the q axis. A Vdc_ref voltage reference signal that indicates a desired DC link voltage is compared to a Vdc voltage return signal which is a measurement of the DC link voltage. A DC voltage PI-based controller 26 uses the comparison of the voltage reference signal Vdc_ref and the voltage return signal Vdc to provide a current reference signal on the torque axis (or q axis) lq * _ref. A function block 28 imposes a ramp rate limit suitable for the lq * _ref torque axis current reference signal and provides a lq * _lim limited torque axis current signal which is then used by the generator bridge controller 20 to derive the Eabc trip commands for the power switching semiconductor devices of the generator bridge 10 to obtain a desired generator torque. During a grid or transient failure, then the ramp rate limits imposed by function block 28 to the current reference signal lq * _ref will not allow the torque of the generator to change in step and do, instead, with that the generator torque is reduced at a constant rate (that is, reduced in ramp) according to the equation EQ1 mentioned above. The ramp rate limits can be imposed as soon as the grid failure is detected or after a predetermined delay time during which the generator torque is maintained at the same torque that it had immediately before the grid failure appeared.
    [040] The importance of the ramp rate limits can be observed considering the case without its presence. Before a grid failure or power converter failure, generator 4 will export energy to link DC 12 through the bridge of generator 10. To balance the voltage of the link DC, power is exported through the bridge of network 14 to the supply network. Either the generator bridge 10 or the network bridge 14 may be responsible for maintaining the dc link voltage at the desired level. / during a grid failure or a power converter failure, the energy that can be exported to the supply network will be reduced and will cause the DC link voltage to increase. If the generator bridge 10 is responsible for controlling the DC link voltage then the generator bridge controller 20 will quickly reduce the current reference signal on the torque axis lq * _ref to reduce the DC link voltage. Alternatively, the generator bridge torque reference can be quickly reduced by a forward signal that is provided by the network bridge controller 22. Either method, the current reference signal on the torque axis lq * _ref will therefore undergo a torque change approaching a step change as shown in graph (c) of Figure 2A. In the present invention, ramp rate limits are applied to limit the rate at which the current reference signal on the lq * _ref torque axis can be reduced and cause the generator torque to decrease at a constant rate according to the EQ1 equation mentioned above.
    [041] Although the specific description focused on a grid failure situation, it will be easily seen that the ramp rate limits can be imposed on the current reference signal on the torque axis lq * _ref in the event of a fault in the power converter.
    [042] The control diagram in Figure 3 is for illustrative purposes only, and it can be easily seen that the generator torque can be controlled using other torque axis current reference and / or torque reference control systems. .
    权利要求:
    Claims (10)
    [0001]
    1. GENERATOR TORQUE CONTROL METHOD, applied to a wind turbine (2) comprising a generator (4) and a mechanical rotation system having a natural period Tn, characterized by including a step of reducing the torque of the generator ( 4) during a fault condition at a constant rate in relation to time t according to the equation:
    [0002]
    2. METHOD according to claim 1, characterized by the wind turbine (2) further comprising a turbine assembly that has at least one turbine blade, the method also including a step of changing the angle of inclination of at least one blade turbine to minimize the peak speed of the generator (4) a fault condition.
    [0003]
    METHOD according to any one of claims 1 to 2, characterized in that the angle of inclination of the at least one turbine blade is changed as soon as the fault condition is detected.
    [0004]
    4. METHOD according to any of claims 2 to 3, characterized in that it also includes a step of keeping the torque of the generator (4) constant for a period of time during a fault condition before reducing the torque at a rate constant.
    [0005]
    5. METHOD, according to claim 4, characterized by the torque of the generator (4) being kept constant while changing the angle of inclination of at least one turbine blade.
    [0006]
    6. METHOD, according to claim 1, characterized by the torque being reduced to a constant rate as soon as the fault condition is detected.
    [0007]
    METHOD according to any one of claims 1 to 6, characterized in that the wind turbine (2) further comprises a generator bridge (10) which is controlled by a generator bridge controller (20), the method further comprising a step to reduce the torque at a constant rate by imposing ramp rate limits on a torque reference and / or a torque axis current reference (lq * _ref) that is used by the generator bridge controller (20) .
    [0008]
    8. WIND TURBINE (2), characterized by comprising: a generator (4); a mechanical rotation system that has a natural period Tn, the mechanical rotation system including a turbine assembly that has at least one turbine blade, a generator rotor assembly (4) and any (any) motor shaft (s) ( es) associate (s); a power converter; the power converter being controlled to reduce the generator torque (4) during a fault condition at a constant rate in relation to time t according to the equation
    [0009]
    WIND TURBINE (2) according to claim 8, characterized in that the turbine assembly further includes a blade tilt angle actuator that is controlled to change the tilt angle of at least one turbine blade to minimize speed peak generator (4) during a fault condition.
    [0010]
    WIND TURBINE (2) according to any one of claims 8 to 9, characterized in that the power converter comprises a generator bridge (10) which is controlled by a generator bridge controller (20) to reduce the torque of the generator (4) during a fault condition at a constant rate by imposing ramp rate limits on a torque reference and / or a torque axis current reference (lq * _ref) that is used by the bridge controller generator (20).
    类似技术:
    公开号 | 公开日 | 专利标题
    BR112013000240B1|2020-12-15|GENERATOR AND WIND TURBINE TORQUE CONTROL METHOD
    JP4501958B2|2010-07-14|Wind power generation system and control method thereof
    CA2825504C|2020-09-22|Method and systems for operating a wind turbine using dynamic braking in response to a grid event
    US8093742B2|2012-01-10|Method for operating a power dissipating unit in a wind turbine
    US20110142634A1|2011-06-16|Overspeed protection system and method
    US8217630B2|2012-07-10|Electric load damper for damping torsional oscillation
    CA2797906C|2017-05-16|Electric generator control system and method
    PT1499009E|2008-01-14|Control and protection of a doubly-fed induction generator system
    US20150249414A1|2015-09-03|Wind turbine systems and methods for operating the same
    BR102013021844A2|2016-09-27|method and system for controlling a double-powered induction generator and method for controlling wind turbine electrical components
    BR102015012643A2|2017-05-09|method for controlling a power generation system and systems for controlling a power generation and wind turbine system connected to a weak grid
    US8451573B1|2013-05-28|Overvoltage protection device for a wind turbine and method
    BR102016011395A2|2016-11-22|Method and control system for a wind turbine and wind turbine system
    ES2547637T3|2015-10-07|Variable wind turbine with power dissipation unit; method to operate a power dissipation unit in a wind turbine
    EP3599709A1|2020-01-29|System and method for controlling multiple igbt temperatures in a power converter of an electrical power system
    US9494139B2|2016-11-15|System and method for controlling a power output of a wind turbine generator
    JP6800240B2|2020-12-16|Power supply method and wind turbine for power supply
    Muljadi et al.2016|Energy storage opportunities and capabilities of a type 3 wind turbine generator
    JP4894906B2|2012-03-14|Wind power generation system control method
    JP2016116305A|2016-06-23|Power generation system or wind power generation system
    ES2345758A2|2010-09-30|Low voltage ride through
    Divya et al.2015|Performance of DFIG wind turbine with speed tracking control under various faults
    同族专利:
    公开号 | 公开日
    CN102985685B|2016-01-20|
    EP2405134B1|2013-02-20|
    KR20140000138A|2014-01-02|
    CA2802766A1|2012-01-12|
    ES2407678T3|2013-06-13|
    CN102985685A|2013-03-20|
    EP2405134A1|2012-01-11|
    WO2012003970A1|2012-01-12|
    US20130207394A1|2013-08-15|
    US8981584B2|2015-03-17|
    BR112013000240A2|2016-05-17|
    DK2405134T3|2013-05-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4316722A|1980-01-09|1982-02-23|Twin Disc, Incorporated|Propulsion system for submarine|
    CN1134715C|1998-11-17|2004-01-14|精工爱普生株式会社|Electronically controlled mechanical timepiece|
    DE10105892A1|2001-02-09|2002-09-12|Daimlerchrysler Rail Systems|Wind power plant and method for operating it has overvoltage limiter during momentary interruption in power supply|
    AT504818A1|2004-07-30|2008-08-15|Windtec Consulting Gmbh|TRANSMISSION TRAIL OF A WIND POWER PLANT|
    US7425771B2|2006-03-17|2008-09-16|Ingeteam S.A.|Variable speed wind turbine having an exciter machine and a power converter not connected to the grid|
    CN101401294B|2006-03-17|2013-04-17|英捷电力技术有限公司|Variable speed wind turbine having an exciter machine and a power converter not connected to the grid|
    DE102006060323A1|2006-12-20|2008-06-26|Nordex Energy Gmbh|Method for operating wind energy plant, involves transmitting driving torque to generator over power train, where generator provides predetermined generator torque acting opposite driving torque|US9467082B2|2012-01-27|2016-10-11|Vestas Wind Systems A/S|Method for damping drive train oscillations in a wind turbine generator|
    EP2628947B1|2012-02-14|2018-12-19|XEMC Darwind B.V.|Torque control for a wind turbine generator in case of fault|
    CN103375332B|2012-04-17|2016-06-08|北京能高自动化技术股份有限公司|Speed-changing oar-changing wind power generating set optimum moment of resistance dynamic optimization method|
    WO2014008647A1|2012-07-12|2014-01-16|General Electric Company|Dynamic braking system for an electric power system and method of operating the same|
    CN102818951B|2012-07-27|2015-02-04|国电联合动力技术有限公司|Method, system and device for measuring performance index of wind power unit converter on line|
    FR3005221B1|2013-04-26|2016-10-21|Alstom Technology Ltd|ALTERNATIVE CONTINUOUS CONVERTER FOR CONTROLLING A SYNCHRONOUS GENERATOR WITH PERMANENT MAGNETS|
    WO2014194464A1|2013-06-04|2014-12-11|General Electric Company|Methods for operating wind turbine system having dynamic brake|
    CN103485978B|2013-10-14|2015-07-15|东南大学|Control method for compensating electromagnetic torque to realize quick and smooth tracking of maximum wind energy|
    US10113533B2|2014-09-05|2018-10-30|General Electric Company|System and method for reducing wind turbine oscillations caused by grid faults|
    EP3001540B1|2014-09-26|2018-03-21|ALSTOM Renewable Technologies|Direct-drive wind turbines|
    CN105680706A|2014-11-18|2016-06-15|台达电子工业股份有限公司|Direct current power supply apparatus|
    CN104963810A|2015-07-02|2015-10-07|国电联合动力技术有限公司|Low-wind-speed generation optimization control method and system of wind generating set|
    CN105545613B|2016-01-25|2017-11-10|河南科技大学|A kind of measuring method of the average staring torque of vertical axis rotor|
    CN108925140B|2016-02-05|2020-12-18|Abb瑞士股份有限公司|Heating a wind turbine facility|
    US10415544B2|2017-01-03|2019-09-17|General Electric Company|System and method for determining torque on a wind turbine shaft|
    EP3869030A1|2020-02-20|2021-08-25|ABB Schweiz AG|Wind turbine assembly|
    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-09-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/07/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP10006961A|EP2405134B1|2010-07-06|2010-07-06|Generator torque control method|
    EP10006961.6|2010-07-06|
    PCT/EP2011/003346|WO2012003970A1|2010-07-06|2011-07-06|Generator torque control methods|
    [返回顶部]