Wind power generator and control method therefor, related devices

Abstract

The application discloses a wind power generator and a control method and related device thereof. The method comprises: when the set power of the generator is greater than a first power and less than a second power, setting the set rotating speed of the generator as a second rotating speed; the first torque is greater than the torque corresponding to the first rotating speed; the second torque is the maximum torque of the generator running at the first rotating speed; obtaining the maximum torque of the generator according to the actual rotating speed of the generator and the set torque of the generator; controlling the actual torque of the generator to slide between the set torque and the maximum torque; when the actual torque of the generator meets the torque limit condition of the generator jumping from the first rotating speed to the second rotating speed, the generator jumps from the first rotating speed to the second rotating speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy, in particular to a wind generator, a control method thereof and related devices. BACKGROUND

[0002] In recent years, with the problems of global environmental pollution, energy crisis and global warming intensifying, the application of wind generators is becoming more and more widespread. The speed of the wind generator multiplied by the torque is the power output by the generator. In order to maximize the use of wind energy, when the generator operates according to the optimal speed-torque curve, the generator should maintain the optimal speed corresponding to the power and the optimal torque corresponding to the power. The optimal speed and the optimal torque will increase as the power of the generator increases. Therefore, in the actual operation process, there is a coupling relationship between the speed of the generator and the power of the generator.

[0003] When the generator operates at a certain speed, the corresponding tower may have a risk of resonance. In order to avoid the risk of resonance, the speed of the generator needs to be limited to be less than or equal to a first speed or greater than or equal to a second speed, that is, the speed of the generator needs to avoid the speed interval from the first speed to the second speed. During the operation of the generator, when the speed of the generator operates at the first speed, as the limited power increases, the torque of the generator increases, and the speed remains unchanged until the torque meets a certain limit condition, the speed of the generator will jump directly from the first speed to the second speed.

[0004] When the generator operates in a limited power state, that is, the power of the generator is limited to a set power, the actual speed of the generator will be limited to be less than a set speed corresponding to the set power, and the actual torque will be limited to be less than or equal to a set torque corresponding to the set power. Since there is a coupling relationship between the speed of the generator and the power of the generator, when the generator crosses the speed interval in the limited power state, the torque limit condition of jumping from the first speed to the second speed may conflict with the torque corresponding to the limited power, resulting in that the generator that should jump from the first speed to the second speed cannot jump, thereby causing the reliability of the generator to be low. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a wind generator, a control method thereof and related devices, which avoids the conflict between the torque limit condition of jumping from the first speed to the second speed and the torque corresponding to the limited power, and improves the reliability of the generator.

[0006] In order to achieve the above purpose, the technical scheme provided by the embodiments of the present application is as follows:

[0007] The embodiments of the present application provide a control method of a generator, the generator and a tower have a risk of resonance when the actual speed of the generator is in a speed interval from a first speed to a second speed, the method comprises:

[0008] when the set power of the generator is greater than a first power and less than a second power, setting a set rotating speed of the generator as a second rotating speed; the first power is a product of the first rotating speed and a first torque; the second power is a product of the first rotating speed and a second torque; the first torque is greater than a torque corresponding to the first rotating speed; the second torque is a maximum torque of the generator when the generator operates at the first rotating speed;

[0009] obtaining a maximum torque of the generator according to an actual rotating speed of the generator and a set torque of the generator; the maximum torque is greater than the set torque;

[0010] controlling an actual torque of the generator to slide between the set torque and the maximum torque, when the actual torque of the generator satisfies a torque limit condition of the generator jumping from the first rotating speed to the second rotating speed, the generator jumps from the first rotating speed to the second rotating speed.

[0011] Optionally, the torque limit condition of the generator jumping from the first rotating speed to the second rotating speed comprises:

[0012] the actual torque of the generator remains greater than the first torque for a first preset time;

[0013] or,

[0014] the actual torque of the generator remains the second torque for a second preset time; the first preset time is greater than the second preset time.

[0015] Optionally, the obtaining the maximum torque of the generator according to the actual rotating speed of the generator and the set torque of the generator comprises:

[0016] obtaining a torque coefficient according to the actual rotating speed of the generator;

[0017] obtaining the maximum torque of the generator according to the torque coefficient and the set torque of the generator.

[0018] Optionally, the obtaining the torque coefficient according to the actual rotating speed of the generator comprises:

[0019] obtaining a torque coefficient according to the actual rotating speed of the generator, the first rotating speed and the second rotating speed; when the actual rotating speed of the generator is greater than or equal to the first rotating speed and less than a torque coefficient rotating speed threshold, the torque coefficient is positively correlated with the actual rotating speed; when the actual rotating speed of the generator is greater than the torque coefficient rotating speed threshold and less than the second rotating speed, the torque coefficient is negatively correlated with the actual rotating speed.

[0020] Optionally, the obtaining the maximum torque of the generator according to the torque coefficient and the set torque of the generator comprises:

[0021] multiplying the torque coefficient by the set torque of the generator to obtain the maximum torque of the generator.

[0022] Optionally, when the power of the generator is less than a third power, after the generator jumps from the first rotating speed to the second rotating speed, the actual torque of the generator is controlled to slide between the set torque and the maximum torque, and the maximum torque gradually returns to the set torque; the third power is the product of the second rotating speed and the second torque.

[0023] Optionally, when the set power of the generator is less than the second power and the set rotating speed of the generator is the first rotating speed, the maximum torque of the generator is obtained according to the actual rotating speed of the generator and the set torque of the generator;

[0024] the actual torque of the generator slides between the set torque and the maximum torque, so that the actual rotating speed of the generator is less than or equal to the first rotating speed.

[0025] Optionally, the obtaining the maximum torque of the generator according to the actual rotating speed of the generator and the set torque of the generator comprises:

[0026] the maximum torque of the generator is obtained according to the actual rotating speed of the generator, the set rotating speed of the generator, the second rotating speed and the set torque of the generator; the maximum torque is greater than the set torque and less than a torque threshold; the torque threshold is equal to the set torque multiplied by the actual rotating speed and divided by the first rotating speed.

[0027] Optionally, after the set rotating speed of the generator is set to the second rotating speed, the method further comprises:

[0028] when the generator satisfies all the following conditions, the set rotating speed of the generator is set to the first rotating speed:

[0029] the actual rotating speed of the generator is lower than the first rotating speed;

[0030] the pitch angle of the generator is kept at a minimum pitch angle for a third preset time;

[0031] the generator is kept in a power limiting state for a fourth preset time.

[0032] Optionally, the generator is a flexible tower generator.

[0033] The embodiment of the present application provides a control device of a generator, the generator has resonance risk with a tower when an actual rotating speed of the generator is in a rotating speed interval from a first rotating speed to a second rotating speed, and the device comprises:

[0034] A setting module is configured to set a setting rotating speed of the generator as the second rotating speed when a setting power of the generator is greater than a first power and less than a second power, the first power is a product of the first rotating speed and a first torque, the second power is a product of the first rotating speed and a second torque, the first torque is greater than a torque corresponding to the first rotating speed, and the second torque is a maximum torque when the generator operates at the first rotating speed;

[0035] A maximum torque obtaining module is configured to obtain the maximum torque of the generator according to the actual rotating speed of the generator and a setting torque of the generator, and the maximum torque is greater than the setting torque;

[0036] A control module is configured to control the actual torque of the generator to slide between the setting torque and the maximum torque, and the generator jumps from the first rotating speed to the second rotating speed when the actual torque of the generator meets a torque limit condition of the generator jumping from the first rotating speed to the second rotating speed.

[0037] The embodiment of the present application provides a generator, the generator has resonance risk with a tower when an actual rotating speed of the generator is in a rotating speed interval from a first rotating speed to a second rotating speed,

[0038] The generator comprises:

[0039] A blade wheel is installed on a rotating main shaft;

[0040] A generator is directly connected with the rotating main shaft;

[0041] A power conversion system is connected to a power grid after processing electric energy output by the generator;

[0042] A control device comprises:

[0043] A setting module is configured to set a setting rotating speed of the generator as the second rotating speed when a setting power of the generator is greater than a first power and less than a second power, the first power is a product of the first rotating speed and a first torque, the second power is a product of the first rotating speed and a second torque, the first torque is greater than a torque corresponding to the first rotating speed, and the second torque is a maximum torque when the generator operates at the first rotating speed;

[0044] A maximum torque obtaining module is configured to obtain the maximum torque of the generator according to the actual rotating speed of the generator and a setting torque of the generator, and the maximum torque is greater than the setting torque;

[0045] The control module is used to control the actual torque of the generator to slide between the set torque and the maximum torque. When the actual torque of the generator meets the torque limit condition for the generator to jump from the first speed to the second speed, the generator jumps from the first speed to the second speed.

[0046] Embodiments of this application provide a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the generator control method described above is implemented.

[0047] Embodiments of this application provide a computing device, including:

[0048] At least one processor;

[0049] At least one memory stores a computer program that, when executed by the at least one processor, implements the generator control method described above.

[0050] As can be seen from the above technical solutions, the embodiments of this application have the following beneficial effects:

[0051] This application provides a generator control method, including: when the actual speed of the generator is within the speed range of a first speed to a second speed, there is a risk of resonance between the generator and the tower. The method includes: when the set power of the generator is greater than the first power but less than the second power, setting the set speed of the generator to the second speed; obtaining the maximum torque of the generator based on the actual speed of the generator and the set torque of the generator; the maximum torque being greater than the set torque; controlling the actual torque of the generator to slide between the set torque and the maximum torque; when the actual torque of the generator meets the torque limit condition for the generator to jump from the first speed to the second speed, the generator jumps from the first speed to the second speed.

[0052] The generator control method provided in this application embodiment allows the generator torque to slide between a set torque and a maximum torque when the generator's set power is greater than a first power but less than a second power, and the generator's set speed is the second speed but the actual speed of the engine set is less than the second speed. This means the generator's speed tends to exceed the speed range from the first speed to the second speed. The maximum torque is obtained from the generator's actual speed. This ensures that the wind turbine in this application embodiment, when exceeding the speed range from the first speed to the second speed, can meet the torque limit condition for jumping from the first speed to the second speed with minimal impact on the generator's power. This decouples the generator from the power limit effect on the torsional limit, avoids conflicts between the torque limit condition for jumping from the first speed to the second speed and the torque corresponding to the power limit, and improves the generator's reliability. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A generator speed-torque mapping diagram is provided for embodiments of this application;

[0055] Figure 2 A flowchart of a generator control method provided in an embodiment of this application;

[0056] Figure 3 A flowchart of a generator power limiting method provided in this application embodiment;

[0057] Figure 4 A flowchart of a generator power limiting control method between a first power and a second power is provided as an embodiment of this application;

[0058] Figure 5 A flowchart of a control method for limiting a generator to between a first power and a third power, provided in an embodiment of this application;

[0059] Figure 6 This is a schematic diagram of the structure of a generator control device provided in an embodiment of this application;

[0060] Figure 7 This is a schematic diagram of the system structure of a generator provided in an embodiment of this application. Detailed Implementation

[0061] To help better understand the solutions provided in the embodiments of this application, before introducing the methods provided in the embodiments of this application, we will first introduce the application scenarios of the solutions in the embodiments of this application.

[0062] In recent years, with the increasing severity of global environmental pollution, energy crisis and global warming, the application of wind power generation technology has become more and more widespread.

[0063] The generator control method provided in this application is applied to wind turbines. The following describes... Figure 7 This application describes the generator control method provided in the embodiments of the present application using a generator as an example.

[0064] Figure 7This is a schematic diagram of a generator system structure provided in an embodiment of this application, wherein the generator is a permanent magnet direct-drive type. The generator 700 includes an impeller 702 mounted on a rotating main shaft, and the blade pitch angle of the impeller 702 is controlled by a pitch signal. The generator 704 is directly connected to the rotating main shaft, and the electrical energy output by the generator 704 is output through a power conversion system 710, then connected to the power grid via a transformer 706. The control device 720 can acquire the blade pitch angle of the impeller 702 and control the impeller speed and generator speed by setting the blade pitch angle value; the control device 720 can also acquire and control the motor torque through the converter system 710.

[0065] The generator's output power is calculated by multiplying its rotational speed by its torque. To maximize wind energy utilization, when the generator operates at a fixed power output, it should maintain the optimal rotational speed and torque corresponding to that power. The optimal rotational speed and torque increase as the generator's power output increases. Therefore, in actual operation, there is a coupling relationship between generator rotational speed and generator power output.

[0066] Generators operating at certain speeds pose a risk of resonance with their corresponding towers. To avoid this risk, the generator's operating speed must be limited to either a first speed or a second speed; that is, the generator's speed must avoid the range between the first and second speeds. The following section will discuss... Figure 1 This application describes the principle of generator speed avoidance operation in the embodiments of this application.

[0067] See Figure 1 This figure is a generator speed-torque mapping diagram provided in an embodiment of this application.

[0068] like Figure 1As shown, the horizontal axis represents the generator's speed, and the vertical axis represents the generator's torque. The curve in the figure represents the mapping relationship between the optimal speed and the optimal torque. The speed corresponding to point A is the first speed, the speed corresponding to point F is the second speed, the torque corresponding to point B is the first torque, and the torque corresponding to point C is the second torque (the torque corresponding to point E can be equal to the torque corresponding to point C). The torque corresponding to point C is the maximum torque allowed for the generator to operate at the first speed. During generator operation, when the generator speed is at the first speed, as the limited power increases, the generator torque increases while the speed remains constant until the torque meets certain limiting conditions, at which point the generator speed will jump directly from the first speed to the second speed. That is, when the generator speed and torque are operating at the speed and torque corresponding to segment AB (hereinafter referred to as the generator operating in segment AB), the generator torque is relatively small and does not meet the torque condition for the speed to jump from the first speed to the second speed, so the speed will stabilize at the first speed. When the generator operates in segment BC and remains in segment BC for a third preset time, that is, after the generator torque is greater than the first torque for a third preset time, the generator speed will jump from the first speed to the second speed, that is, jump to segment DF.

[0069] When the generator operates in a power-limited state, its power is restricted to a set power level, and its actual speed is limited to a speed corresponding to the set power, while its actual torque is limited to a torque corresponding to the set power. When the generator's power is limited to the level corresponding to segment BC, if the set speed is the first speed, the generator's speed cannot be increased to the second speed. Therefore, when the generator operates in segment BC, the solution provided in this application sets the generator's set speed to the second speed to avoid the set speed affecting the generator's jump from the first speed to the second speed.

[0070] When the generator's power is limited to the power corresponding to segment BC, the solution provided in this application sets the generator's set speed to a second speed. At this time, the generator's actual speed has not yet jumped from the first speed to the second speed. Since the set speed at this time is a relatively large second speed, and the set torque equals the set power divided by the set speed, the generator's set torque may be less than the first torque. Thus, when the generator's power is limited to the power corresponding to segment BC, the generator's actual torque may be limited to less than or equal to the first torque, causing the generator to fail to meet the torque limitation condition for jumping from the first speed to the second speed, thereby preventing the generator from jumping from the first speed to the second speed. That is, the torque limitation condition for jumping from the first speed to the second speed conflicts with the torque corresponding to the power limit, causing the generator, which should jump from the first speed to the second speed, to fail to jump, resulting in low generator reliability.

[0071] To address the aforementioned technical problems, this application provides a generator control method. When the generator's set power is greater than a first power but less than a second power, and the generator's set speed is the second speed but the actual speed of the generator set is less than the second speed (i.e., the generator's power is operating in segment BC), the generator's torque slides between a set torque and a maximum torque greater than the set torque. Thus, in this application embodiment, when the wind turbine generator's power limit is at the power corresponding to segment BC, even if the generator's set torque is less than the torque limit condition for jumping from the first speed to the second speed, the actual torque of the generator can satisfy the torque limit condition for jumping from the first speed to the second speed because the generator's torque can slide between the set torque and the maximum torque. This avoids a conflict between the torque limit condition for jumping from the first speed to the second speed and the torque corresponding to the power limit, improving the generator's reliability.

[0072] The generator set control method provided in this application can be applied to a single generator or to a generator set; this application does not limit the application to this method. To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0073] See Figure 2 The figure is a flowchart of a generator control method provided in an embodiment of this application.

[0074] The generator provided in this application embodiment has a risk of resonance with the tower when the actual speed of the generator is within the speed range of the first speed to the second speed. This includes:

[0075] S101: When the generator's set power is greater than the first power but less than the second power, the generator's set speed is set to the second speed; the first power is the product of the first speed and the first torque; the second power is the product of the first speed and the second torque; the first torque is greater than the torque corresponding to the first speed; the second torque is the maximum torque of the generator when it operates at the first speed.

[0076] S102: Obtain the maximum torque of the generator based on the actual speed of the generator and the set torque of the generator; the maximum torque is greater than the set torque.

[0077] S103: Controls the actual torque of the generator to slide between the set torque and the maximum torque. When the actual torque of the generator meets the torque limit condition for the generator to jump from the first speed to the second speed, the generator jumps from the first speed to the second speed.

[0078] The embodiments of this application provide a first torque that is greater than the optimal torque corresponding to the first speed, and a second torque that is less than the optimal torque corresponding to the second speed. For example... Figure 1As shown, the first rotational speed is the speed corresponding to point A, and the second rotational speed is the speed corresponding to point F. The first torque is the torque corresponding to point B, and the second torque is the torque corresponding to point C. The torque corresponding to point A, which is the optimal torque corresponding to the first rotational speed, is less than the first torque. The torque corresponding to point F, which is the optimal torque corresponding to the second rotational speed, is greater than the second torque.

[0079] Accordingly, when the generator's set power is greater than the first power but less than the second power, the generator operates in segment BC. In this case, the generator's set speed is set to the second speed, which corresponds to point F. It should be understood that when the generator operates in segment BC, the actual torque is much greater than the torque corresponding to the actual speed. Prolonged operation in this state may lead to problems such as generator stall. Therefore, to allow the generator speed to jump from the first speed to the second speed when operating in segment BC, the set speed is set to the second speed.

[0080] When the solution provided in this application sets the set speed to the second speed, according to the calculation method of the set torque (i.e., the set torque equals the set power divided by the set speed), the set torque of the generator will decrease. Therefore, the actual torque of the generator may not meet the torque limit condition for jumping from the first speed to the second speed, thus preventing the generator from jumping from the first speed to the second speed. To avoid the above problem, this application replaces the original set torque with the maximum torque, which is greater than the set torque. This allows the generator torque to slide between the set torque and the maximum torque. When the generator operates in segment BC, the torque limit condition for jumping from the first speed to the second speed can be met.

[0081] It should be understood that, due to the lower tower frequency of flexible tower generators, the tower of flexible tower wind turbines is more prone to resonance with the generator set within the generator's normal operating speed range. Therefore, the method provided in the embodiments of this application is particularly suitable for flexible tower generators.

[0082] In one possible implementation of this application, the torque limiting condition for the generator to jump from a first speed to a second speed includes: the actual torque of the generator being maintained greater than the first torque for a first preset time; or, the actual torque of the generator being maintained greater than the second torque for a second preset time; the first preset time being greater than the second preset time. It should be understood that in practical applications, the actual torque of the generator may be less than or equal to the second torque and there may be an error. Therefore, maintaining the second torque in this application embodiment can be close to the second torque, for example, greater than 0.99 * the second torque.

[0083] Furthermore, as a possible implementation, to avoid frequent generator switching, when the actual torque of the generator meets the torque limit condition for switching from the first speed to the second speed, the generator switches from the first speed to the second speed after a certain delay. As an example, the delay time can be 500ms.

[0084] In this embodiment, obtaining the maximum torque of the generator based on its actual rotational speed and set torque includes: obtaining a torque coefficient based on the actual rotational speed of the generator; and obtaining the maximum torque of the generator based on the torque coefficient and set torque. The methods for obtaining the torque coefficient and obtaining the maximum torque based on the torque coefficient will be described below with reference to embodiments.

[0085] In this embodiment, obtaining the torque coefficient based on the generator's actual speed includes: obtaining the torque coefficient based on the generator's actual speed, a first speed, and a second speed; when the generator's actual speed is greater than or equal to the first speed but less than the torque coefficient speed threshold, the torque coefficient is positively correlated with the actual speed; when the generator's actual speed is greater than the torque coefficient speed threshold but less than the second speed, the torque coefficient is negatively correlated with the actual speed. It should be understood that when the generator's actual speed is greater than or equal to the first speed but less than the torque coefficient speed threshold, the generator has not yet jumped from the first speed to the second speed, and a larger torque coefficient is needed to meet the torque condition for jumping from the first speed to the second speed. When the generator's actual speed is greater than the torque coefficient speed threshold but less than the second speed, the torque condition for jumping from the first speed to the second speed has been met, and the torque coefficient begins to return to its initial value. As an example, the torque coefficient speed threshold can be 1.06 * the first speed.

[0086] In this embodiment, obtaining the maximum torque of the generator based on the torque coefficient and the generator's set torque includes: multiplying the torque coefficient by the generator's set torque to obtain the maximum torque of the generator. It should be understood that the maximum torque is greater than the set torque, therefore the torque coefficient should be greater than 1.

[0087] In this embodiment, when the generator's power is less than the third power, after the generator jumps from the first speed to the second speed, the actual torque of the generator is controlled to slide between the set torque and the maximum torque, with the maximum torque gradually returning to the set torque; the third power is the product of the second speed and the second torque. It should be understood that after the generator jumps from the first speed to the second speed, in order to maintain a relatively stable generator power, the maximum torque is slowly and gradually returned to the set torque, so that the generator can smoothly switch from its operating state to normal operating state without significant power fluctuations.

[0088] The above-described scheme mainly includes a sliding torque control scheme for the generator jumping from a first speed to a second speed. It should be understood that, in the generator provided in this application embodiment, when the power-limited operation jumps from the second speed to the first speed, the set speed changes from the second speed to the first speed, causing the set torque to increase. Therefore, the set power for power limiting will not be less than the jump condition for jumping from the second speed to the first speed. As a possible implementation, a sliding torque can also be set when jumping from the second speed to the first speed, making the generator operation more stable. The following will mainly describe the sliding torque control scheme for the generator jumping from the second speed to the first speed.

[0089] As one possible implementation, the method provided in this application further includes: when the set power of the generator is less than the second power and the set speed of the generator is the first speed, obtaining the maximum torque of the generator based on the actual speed of the generator and the set torque of the generator; the actual torque of the generator slides between the set torque and the maximum torque so that the actual speed of the generator is less than or equal to the first speed.

[0090] It should be understood that after the generator jumps from the second speed to the first speed, in order to make the generator run more stably, the actual torque of the generator slides between the set torque and the maximum torque. Even if the actual torque of the generator is greater than the set torque, the actual speed of the generator will decrease, thereby making the generator's operating state move away from the speed range from the first speed to the second speed, and the generator's operation will be more stable.

[0091] As one possible implementation, obtaining the maximum torque of the generator based on the actual speed of the generator and the set torque of the generator includes: obtaining the maximum torque of the generator based on the actual speed of the generator, the set speed of the generator, a second speed, and the set torque of the generator; the maximum torque is greater than the set torque but less than a torque threshold; the torque threshold is equal to the set torque multiplied by the actual speed and divided by the first speed.

[0092] In one embodiment of this application, as a possible implementation, after setting the generator's set speed to the second speed, the method further includes: setting the generator's set speed to the first speed when the generator meets all of the following conditions: the generator's actual speed is lower than the first speed; the generator's pitch angle is maintained at the minimum pitch angle for a third preset time; and the generator is maintained in a power-limited state for a fourth preset time.

[0093] It should be understood that when the above conditions are met, it means that the maximum value of the generator's actual power, i.e., the wind volume, is insufficient to allow the wind turbine's speed to jump from the first speed to the second speed. Therefore, adjusting the generator's set speed back from the second speed to the first speed allows the wind turbine to operate at a suitable speed and torque, which can increase the generator's power to some extent in low wind conditions (when the wind volume is small).

[0094] The above mainly describes the control method and principle of the generator. In order to facilitate the understanding of the solution provided by this application by those skilled in the art, the embodiments of this application also provide a specific example to illustrate the solution provided by the embodiments of this application.

[0095] See Figure 3 This figure is a flowchart of a generator power limiting method provided in an embodiment of this application. See also... Figure 4 This figure is a flowchart of a generator power limiting control method between a first power and a second power, provided in an embodiment of this application. See also... Figure 5 The figure is a flowchart of a control method for limiting a generator to between a first power and a third power, provided in an embodiment of this application.

[0096] like Figure 3 As shown, the method provided in this application embodiment determines whether the power limiting has entered the AF segment (e.g., after the power limiting begins) after power limiting starts. Figure 1 (As shown), otherwise execute the Kopt (optimal modal value) curve, i.e. Figure 1 The curves excluding AF. If the set power corresponding to the power limit is in segment AB, then the set speed is limited to the first speed WA; if the set power corresponding to the power limit is in segment BC, then the following applies. Figure 4 and Figure 5 The control method shown; if the set power corresponding to the power limit is in the CE segment, then the following will be executed: Figure 5 The control method shown; if the set power corresponding to the power limit is in the EF segment, the first set speed is the second speed WF.

[0097] like Figure 4 As shown, the set power corresponding to the power limit is in segment BC, limiting the set speed to the second speed. When the generator meets condition A, the set speed is set to the first speed. Condition A includes all of the following conditions: the actual speed of the generator is lower than the first speed; the pitch angle of the generator is maintained at the minimum pitch angle for a third preset time; the generator is maintained in the power limit state for a fourth preset time. Then, when the generator meets condition B, an upward jump command is sent to the speed adjustment function after a 500ms delay, i.e., a command to jump from the first speed to the second speed. Condition B includes: the actual torque of the generator is maintained greater than the first torque for a first preset time; or, the actual torque of the generator is maintained at the second torque for a second preset time.

[0098] like Figure 5 As shown, the set power corresponding to the power limit is in segment BE. When the jump state is -2, that is, when the actual speed of the generator is less than or equal to the first speed (the generator is operating below C):

[0099] rQmax = SetTorque * GAIN1

[0100] rQmax = LIMIT(SetTorque, rQmax, 1.005 * TMaxJump)

[0101] Where, when WA <= rWg < 1.04 * WA:

[0102] GAIN1 = ((1.005 * (WF / WA) - 1) / (0.04 * WA)) * (rWg - WA) + 1.0

[0103] GAIN1 = LIMIT(1, GAIN1, 1.005 * WF / WA).

[0104] When 1.04 * WA <= rWg < 1.06 * WA:

[0105] GAIN 1 remains;

[0106] When 1.06 * WA <= rWg < WF:

[0107] GAIN1 = ((1 - 1.005 * (WF / WA)) / (WF - 1.06 * WA)) * (rWg - 1.06 * WA) + 1.005 * (WF / WA).

[0108] When the jump state is 1, that is, when the generator jumps from the first speed to the second speed:

[0109] rQmax = MAX(SetTorque, (WF * SetTorque) / rWg).

[0110] When the jump state is -1, that is, when the generator jumps from the second speed to the first speed:

[0111] rQmax = MIN(ABS(rWg / rWs)^2, ABS(WF / rWs)^2) * SetTorque

[0112] rQmax = LIMIT(SetTorque, rQmax, (rWg * SetTorque) / WA).

[0113] Where, rWs is the set speed, SetTorque is the set torque, rQmax is the maximum torque; LIMIT is the function for limiting the upper and lower bounds; rWg is the actual speed of the generator.

[0114] In summary, the embodiments of this application provide a generator control method. When the generator jumps from a first speed to a second speed, the maximum value of the actual torque of the generator is replaced by the original set torque. The maximum torque is greater than the set torque, so that the torque of the generator can slide between the set torque and the maximum torque. This allows the wind turbine to operate in the BC segment, i.e., when the actual power of the generator is greater than the first power, so that the torque limit condition for the generator to jump from the first speed to the second speed can be met.

[0115] Based on the generator control method provided in the above embodiments, this application also provides a generator control device.

[0116] See Figure 6 The figure is a schematic diagram of the control device structure of a generator provided in an embodiment of this application.

[0117] The generator control device provided in this application embodiment poses a risk of resonance between the generator and the tower when the actual speed of the generator is within the speed range of the first speed to the second speed. For example... Figure 6 As shown, the control device for the generator set provided in this application embodiment includes:

[0118] The setting module 100 is used to set the generator's set speed to the second speed when the generator's set power is greater than the first power but less than the second power; the first power is the product of the first speed and the first torque; the second power is the product of the first speed and the second torque; the first torque is greater than the torque corresponding to the first speed; and the second torque is the maximum torque of the generator when it operates at the first speed.

[0119] The maximum torque acquisition module 200 is used to obtain the maximum torque of the generator based on the actual speed of the generator and the set torque of the generator; the maximum torque is greater than the set torque.

[0120] The control module 300 is used to control the actual torque of the generator to slide between the set torque and the maximum torque. When the actual torque of the generator meets the torque limit condition for the generator to jump from the first speed to the second speed, the generator jumps from the first speed to the second speed.

[0121] See Figure 7 The present application provides a generator, wherein the control device 720 includes the above-mentioned setting module 100, maximum torque acquisition module 200 and control module 300.

[0122] In summary, the embodiments of this application provide a generator and its control device. When the generator jumps from a first speed to a second speed, the maximum value of the actual torque of the generator is replaced by the maximum torque instead of the original set torque. The maximum torque is greater than the set torque, so that the torque of the generator can slide between the set torque and the maximum torque, thereby enabling the generator to meet the torque limit condition for the generator to jump from the first speed to the second speed.

[0123] Embodiments of this application provide a computer-readable storage medium storing a computer program, wherein, when the computer program is executed by a processor, it implements... Figures 2 to 4 The control method for the generator.

[0124] Embodiments of this application provide a computing device, including:

[0125] At least one processor;

[0126] At least one memory stores a computer program that, when executed by the at least one processor, implements... Figures 2 to 4 The control method for the generator.

[0127] In one embodiment, Figure 7 The control device 720 shown stores a computer program, which, when executed by the control device 720, implements... Figures 2 to 4 The control method for the generator.

[0128] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0129] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the methods disclosed in the embodiments, since they correspond to the systems disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the system section description.

[0130] It should also be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0131] The above description of the disclosed embodiments will enable those skilled in the art to make or use various modifications to these embodiments. It will be readily apparent to those skilled in the art that the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method of a wind power generator, characterized by, The actual rotating speed of the generator is in a rotating speed interval from the first rotating speed to the second rotating speed, and the generator is at risk of resonance with the tower, and the method comprises: When the set power of the generator is greater than a first power and less than a second power, the set rotating speed of the generator is set as the second rotating speed; the first power is a product of the first rotating speed and a first torque; the second power is a product of the first rotating speed and a second torque; the first torque is greater than a torque corresponding to the first rotating speed; the second torque is a maximum torque of the generator when the generator operates at the first rotating speed; A torque coefficient is obtained according to the actual rotating speed of the generator; A maximum torque of the generator is obtained according to the torque coefficient and a set torque of the generator; the maximum torque is greater than the set torque; The actual torque of the generator is controlled to slide between the set torque and the maximum torque, and when the actual torque of the generator meets a torque limit condition for the generator to jump from the first rotating speed to the second rotating speed, the generator jumps from the first rotating speed to the second rotating speed.

2. The method of claim 1, wherein, The torque limit condition for the generator to jump from the first rotating speed to the second rotating speed comprises: The actual torque of the generator remains greater than the first torque for a first preset time; Or, The actual torque of the generator remains the second torque for a second preset time; the first preset time is greater than the second preset time.

3. The method of claim 1, wherein, The torque coefficient is obtained according to the actual rotating speed of the generator, the first rotating speed and the second rotating speed; when the actual rotating speed of the generator is greater than or equal to the first rotating speed and less than a torque coefficient rotating speed threshold, the torque coefficient is positively correlated with the actual rotating speed; when the actual rotating speed of the generator is greater than the torque coefficient rotating speed threshold and less than the second rotating speed, the torque coefficient is negatively correlated with the actual rotating speed. The maximum torque of the generator is obtained according to the torque coefficient and the set torque of the generator, comprising:

4. The method of claim 1, wherein, The maximum torque of the generator is obtained by multiplying the torque coefficient by the set torque of the generator. Further comprising:

5. The method of claim 1, wherein, After the generator jumps from the first rotating speed to the second rotating speed when the power of the generator is less than a third power, the actual torque of the generator is controlled to slide between the set torque and the maximum torque, and the maximum torque gradually returns to the set torque; the third power is a product of the second rotating speed and the second torque. Further comprising:

6. The method of claim 1, wherein, When the set power of the generator is less than the second power and the set rotating speed of the generator is the first rotating speed, the maximum torque of the generator is obtained according to the actual rotating speed of the generator and the set torque of the generator; The actual torque of the generator slides between the set torque and the maximum torque, so that the actual rotating speed of the generator is less than or equal to the first rotating speed. The maximum torque of the generator is obtained according to the actual rotating speed of the generator and the set torque of the generator, comprising:

7. The method of claim 1, wherein, ​ The maximum torque of the generator is obtained according to the actual rotating speed of the generator, the set rotating speed of the generator, the second rotating speed and the set torque of the generator; the maximum torque is greater than the set torque and less than a torque threshold; the torque threshold is equal to the set torque multiplied by the actual rotating speed and divided by the first rotating speed.

8. The method of claim 1, wherein, After the set rotating speed of the generator is set as the second rotating speed, the method further comprises: When the generator meets all the following conditions, the set rotating speed of the generator is set as the first rotating speed: The actual rotating speed of the generator is lower than the first rotating speed; The pitch angle of the generator is kept at a minimum pitch angle for a third preset time; The generator is kept in a power limiting state for a fourth preset time.

9. The method according to any one of claims 1 to 8, characterized in that, The generator is a flexible tower generator.

10. A control device for a wind power generator, characterized in that The generator and the tower are at resonance risk when the actual rotating speed of the generator is in a rotating speed interval from the first rotating speed to the second rotating speed, and the device comprises: A setting module is configured to set the set rotating speed of the generator as the second rotating speed when the set power of the generator is greater than a first power and less than a second power; the first power is a product of the first rotating speed and a first torque; the second power is a product of the first rotating speed and a second torque; the first torque is greater than a torque corresponding to the first rotating speed; and the second torque is a maximum torque of the generator when the generator operates at the first rotating speed; A maximum torque obtaining module is configured to obtain a torque coefficient according to the actual rotating speed of the generator; and obtain the maximum torque of the generator according to the torque coefficient and a set torque of the generator; the maximum torque is greater than the set torque; A control module is configured to control the actual torque of the generator to slide between the set torque and the maximum torque, and when the actual torque of the generator meets a torque limiting condition for the generator to jump from the first rotating speed to the second rotating speed, the generator jumps from the first rotating speed to the second rotating speed.

11. A wind driven electric power generator, characterised in that, The generator and the tower are at resonance risk when the actual rotating speed of the generator is in a rotating speed interval from the first rotating speed to the second rotating speed, The generator comprises: An impeller installed on a rotating main shaft; A generator directly connected with the rotating main shaft; A power conversion system connected to a power grid after processing the electric energy output by the generator; A control device comprising: A setting module is configured to set the set rotating speed of the generator as the second rotating speed when the set power of the generator is greater than a first power and less than a second power; the first power is a product of the first rotating speed and a first torque; the second power is a product of the first rotating speed and a second torque; the first torque is greater than a torque corresponding to the first rotating speed; and the second torque is a maximum torque of the generator when the generator operates at the first rotating speed; A maximum torque obtaining module is configured to obtain a torque coefficient according to the actual rotating speed of the generator; and obtain the maximum torque of the generator according to the torque coefficient and a set torque of the generator; the maximum torque is greater than the set torque; A control module is configured to control the actual torque of the generator to slide between the set torque and the maximum torque, and when the actual torque of the generator meets a torque limit condition for the generator to jump from the first rotational speed to the second rotational speed, the generator jumps from the first rotational speed to the second rotational speed.

12. A computer readable storage medium storing a computer program, wherein, When the computer program is executed by a processor, the control method of the generator according to any one of claims 1 to 9 is implemented.

13. A computing device comprising: at least one processor; at least one memory having stored computer program, which when executed by the at least one processor, implements the control method of the generator according to any one of claims 1 to 9.

Images