Wind power generation system variable pitch control method and system based on rotating speed deviation

Abstract

The invention discloses a wind power generation system variable pitch control method and system based on rotation speed deviation, and the method comprises the steps: obtaining the actual rotation speed of a generator, and calculating the rotation speed deviation between the actual rotation speed and the rated rotation speed of the generator; based on the rotating speed deviation, obtaining a reference value of a pitch angle; and based on the reference value of the pitch angle, the variable pitch of the wind power generation system is controlled and adjusted. Therefore, the variable pitch is controlled based on the rotating speed deviation, fluctuation of the power of the wind turbine generator is reduced, stable output of the power of the wind turbine generator is achieved, and the power generation effect is improved.

Description

Technical Field

[0001] This invention relates to the field of pitch control technology, and in particular to a pitch control method and system for wind power generation systems based on speed deviation. Background Technology

[0002] Currently, in wind power systems, pitch control refers to the ability of the blades mounted on the hub of a wind turbine to adjust the pitch angle to maintain the generator's output power at its rated power. Specifically, during wind power system operation, when the output power is less than the rated power, the pitch angle remains unchanged at zero degrees without any adjustment; once the generator's output power reaches the rated power, the pitch angle can be adjusted according to changes in output power to maintain the generator's output power at its rated power.

[0003] However, the above method can only adjust the pitch angle when the actual output power of the generator exceeds the rated power, which causes fluctuations in the power of the wind turbine and thus affects the power generation effect. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To address this, the present invention proposes a pitch control method for wind power generation systems based on rotational speed deviation. This method controls the pitch based on rotational speed deviation, reducing power fluctuations in wind turbine units, achieving stable power output from wind turbine units, and improving power generation efficiency.

[0006] Another objective of this invention is to propose a pitch control system for wind power generation systems based on rotational speed deviation.

[0007] To achieve the above objectives, the present invention proposes a pitch control method for a wind power generation system based on rotational speed deviation, the method comprising:

[0008] Obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator;

[0009] Based on the aforementioned rotational speed deviation, a reference value for the propeller pitch angle is obtained;

[0010] Based on the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

[0011] The pitch control method for wind power generation systems based on rotational speed deviation in this invention may also have the following additional technical features:

[0012] In one embodiment of the present invention, obtaining a reference value for the pitch angle based on the rotational speed deviation includes:

[0013] Obtain the proportional coefficient and integral time constant of the variable pitch control PI regulator;

[0014] Based on the speed deviation, the proportional coefficient, and the integral time constant, a reference value for the pitch angle is obtained.

[0015] In one embodiment of the present invention, obtaining a reference value for the pitch angle based on the speed deviation, the proportional coefficient, and the integral time constant includes: calculating the reference value for the pitch angle using a pitch angle reference value formula based on the speed deviation, the proportional coefficient, and the integral time constant.

[0016] In one embodiment of the present invention, controlling and adjusting the pitch of the wind power generation system based on the reference value of the pitch angle includes:

[0017] Obtain the actual pitch angle value of the wind power generation system;

[0018] Based on the actual pitch angle value and the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

[0019] To achieve the above objectives, another aspect of the present invention proposes a pitch control system for a wind power generation system based on rotational speed deviation, the system comprising:

[0020] The speed deviation module is used to obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator;

[0021] The pitch angle reference calculation module is used to obtain a reference value for the pitch angle based on the speed deviation.

[0022] The variable pitch control execution module is used to control and adjust the variable pitch of the wind power generation system based on the reference value of the pitch angle.

[0023] In one embodiment of the present invention, the pitch angle reference calculation module is specifically used for:

[0024] Obtain the proportional coefficient and integral time constant of the variable pitch control PI regulator;

[0025] Based on the speed deviation, the proportional coefficient, and the integral time constant, a reference value for the pitch angle is obtained.

[0026] In one embodiment of the present invention, the pitch angle reference calculation module is further configured to:

[0027] Based on the speed deviation, the proportional coefficient, and the integral time constant, the reference value of the pitch angle is calculated using the pitch angle reference value formula.

[0028] In one embodiment of the present invention, the variable pitch control execution module is specifically used for:

[0029] Obtain the actual pitch angle value of the wind power generation system;

[0030] Based on the actual pitch angle value and the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

[0031] Another object of the present invention is to provide an electronic device comprising:

[0032] At least one processor; and

[0033] A memory communicatively connected to the at least one processor; wherein,

[0034] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method described in any one of the preceding aspects.

[0035] Another object of the present invention is to provide a computer storage medium storing computer-executable instructions; said computer-executable instructions, when executed by a processor, cause the computer to perform any of the methods described in any of the preceding aspects.

[0036] The pitch control method and system for wind power generation systems based on rotational speed deviation of this invention can control the pitch based on rotational speed deviation, thereby reducing the power fluctuation of the wind turbine, realizing the stable power output of the wind turbine, and improving the power generation effect.

[0037] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 This is a flowchart of a variable pitch control method for a wind power generation system based on rotational speed deviation, according to an embodiment of the present invention.

[0040] Figure 2 This is a structural diagram of a pitch control system for a wind power generation system based on rotational speed deviation, according to an embodiment of the present invention. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0043] The following describes, with reference to the accompanying drawings, a pitch control method and system for wind power generation systems based on rotational speed deviation, according to embodiments of the present invention.

[0044] Figure 1 This is a flowchart of a variable pitch control method for a wind power generation system based on rotational speed deviation, according to an embodiment of the present invention.

[0045] like Figure 1 As shown, the method includes:

[0046] S1, obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator;

[0047] In one embodiment of the present invention, the actual rotational speed of the generator can be obtained based on signals in the control strategy without the need for additional sensors. In another embodiment, the actual rotational speed of the generator can be obtained based on a preset time interval. For example, assuming the preset time interval is 5 minutes, the actual rotational speed of the generator can be obtained at 5-minute intervals.

[0048] In one embodiment of the present invention, after obtaining the actual speed of the generator, the speed deviation between the actual speed and the rated speed of the generator can be calculated. In one embodiment of the present invention, ω... rN Let ω be the generator's rated speed and ω be the generator's actual speed, then the speed deviation Δω r =ω r -ω rN .

[0050] S2, based on the speed deviation, obtain the reference value of the pitch angle;

[0051] In one embodiment of the present invention, after obtaining the rotational speed deviation through the above steps, a reference value for the pitch angle can be obtained based on the rotational speed deviation. In another embodiment of the present invention, before obtaining the reference value for the pitch angle based on the rotational speed deviation, the method may further include: determining whether the rotational speed deviation is greater than a preset threshold; if the rotational speed deviation is greater than the preset threshold, then obtaining the reference value for the pitch angle based on the rotational speed deviation; if the rotational speed deviation is less than or equal to the preset threshold, then no adjustment of the pitch angle is required.

[0052] In one embodiment of the present invention, the method for obtaining a reference value of the pitch angle based on the speed deviation may include: obtaining the proportional coefficient and integral time constant of the variable pitch control PI regulator, and obtaining a reference value of the pitch angle based on the speed deviation, the proportional coefficient and the integral time constant.

[0053] Furthermore, in one embodiment of the present invention, the method for obtaining a reference value of the pitch angle based on the rotational speed deviation, the proportional coefficient, and the integral time constant may include: calculating the reference value of the pitch angle using a pitch angle reference value formula based on the rotational speed deviation, the proportional coefficient, and the integral time constant, wherein the pitch angle reference value formula is:

[0054]

[0055] Where, β * For the speed deviation, k pβ t is the proportional coefficient of the PI controller for pitch control. iβ This is the integral time constant of the PI controller for pitch control.

[0056] S3 controls and adjusts the pitch of the wind power generation system based on the reference value of the pitch angle.

[0057] In one embodiment of the present invention, after obtaining the reference value of the pitch angle through the above steps, the variable pitch of the wind power generation system can be controlled and adjusted based on the reference value of the pitch angle.

[0058] In one embodiment of the present invention, before controlling and adjusting the variable pitch of the wind power generation system based on the reference value of the pitch angle, the method may further include: determining whether the reference value of the pitch angle falls within the range of pitch angle variation; if the reference value of the pitch angle falls within the range of pitch angle variation, then controlling and adjusting the variable pitch of the wind power generation system based on the reference value of the pitch angle; if the reference value of the pitch angle does not fall within the range of pitch angle variation, then re-determining the reference value of the pitch angle. In one embodiment of the present invention, the reference value of the pitch angle may be re-determined based on human experience.

[0059] Furthermore, in one embodiment of the present invention, the method for controlling and adjusting the variable pitch of a wind power generation system based on a reference value of the pitch angle may include: obtaining the actual pitch angle value of the wind power generation system; and controlling and adjusting the variable pitch of the wind power generation system based on the actual pitch angle value and the reference value of the pitch angle. In one embodiment of the present invention, the variable pitch control method can effectively reduce the mechanical torque of the wind turbine generator set and improve the stress on the mechanical parts of the wind turbine generator set.

[0060] In one embodiment of the present invention, pitch control is performed using the speed signal on the motor side, which provides fast control speed. When the wind power generation system is in windy weather, the pitch control method can quickly reduce the energy captured by the wind turbine to keep the power near the rated value, thereby reducing the power fluctuation of the wind turbine and achieving stable power output of the wind turbine, thus improving the power generation effect.

[0061] In one embodiment of the present invention, the actual rotational speed of the generator is obtained, and the speed deviation between the actual rotational speed and the rated rotational speed of the generator is calculated; based on the speed deviation, a reference value for the pitch angle is obtained; based on the reference value for the pitch angle, the variable pitch of the wind power generation system is controlled and adjusted. Thus, the variable pitch can be controlled based on the speed deviation, thereby reducing the fluctuation of wind turbine power, achieving stable power output of the wind turbine, and improving power generation efficiency.

[0062] To achieve the above embodiments, such as Figure 2 As shown, this embodiment also provides a wind power generation system pitch control system 10 based on speed deviation. The system includes a speed deviation module 201, a pitch angle reference calculation module 202, and a pitch control execution module 203.

[0063] The speed deviation module 201 is used to obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator.

[0064] The pitch angle reference calculation module 202 is used to obtain a reference value for the pitch angle based on the speed deviation.

[0065] The variable pitch control execution module 203 is used to control and adjust the variable pitch of the wind power generation system based on the reference value of the pitch angle.

[0066] In this embodiment of the disclosure, the above-mentioned pitch angle reference calculation module is specifically used for:

[0067] Obtain the proportional coefficient and integral time constant of the variable pitch control PI regulator;

[0068] The reference value of the pitch angle is obtained based on the speed deviation, proportional coefficient, and integral time constant.

[0069] Furthermore, the aforementioned pitch angle reference calculation module is also used for:

[0070] The reference value of the pitch angle is calculated using the pitch angle reference value formula based on the speed deviation, proportional coefficient, and integral time constant.

[0071] Furthermore, the pitch control execution module is specifically used for:

[0072] Obtain the actual pitch angle value of the wind power generation system;

[0073] Based on the actual pitch angle value and the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

[0074] According to an embodiment of the present invention, a wind power generation system pitch control system based on rotational speed deviation can control the pitch based on rotational speed deviation, thereby reducing the power fluctuation of the wind turbine, realizing stable power output of the wind turbine, and improving power generation efficiency.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A method for variable pitch control of a wind power generation system based on rotational speed deviation, characterized in that, The method includes: Obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator; Based on the aforementioned rotational speed deviation, a reference value for the propeller pitch angle is obtained; Based on the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

2. The method according to claim 1, characterized in that, The process of obtaining a reference value for the pitch angle based on the speed deviation includes: Obtain the proportional coefficient and integral time constant of the variable pitch control PI regulator; Based on the speed deviation, the proportional coefficient, and the integral time constant, a reference value for the pitch angle is obtained.

3. The method according to claim 2, characterized in that, The step of obtaining a reference value for the pitch angle based on the speed deviation, the proportional coefficient, and the integral time constant includes: calculating the reference value for the pitch angle using a pitch angle reference value formula based on the speed deviation, the proportional coefficient, and the integral time constant.

4. The method according to claim 1, characterized in that, The control and adjustment of the pitch of the wind power generation system based on the reference value of the pitch angle includes: Obtain the actual pitch angle value of the wind power generation system; Based on the actual pitch angle value and the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

5. A pitch control system for a wind power generation system based on rotational speed deviation, characterized in that, The system includes: The speed deviation module is used to obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator; The pitch angle reference calculation module is used to obtain a reference value for the pitch angle based on the speed deviation. The variable pitch control execution module is used to control and adjust the variable pitch of the wind power generation system based on the reference value of the pitch angle.

6. The system according to claim 5, characterized in that, The pitch angle reference calculation module is specifically used for: Obtain the proportional coefficient and integral time constant of the variable pitch control PI regulator; Based on the speed deviation, the proportional coefficient, and the integral time constant, a reference value for the pitch angle is obtained.

7. The system according to claim 6, characterized in that, The pitch angle reference calculation module is also used for: Based on the speed deviation, the proportional coefficient, and the integral time constant, the reference value of the pitch angle is calculated using the pitch angle reference value formula.

8. The system according to claim 5, characterized in that, The pitch control execution module is specifically used for: Obtain the actual pitch angle value of the wind power generation system; Based on the actual pitch angle value and the reference value of the pitch angle, the pitch of the wind power generation system is controlled and adjusted.

9. An electronic device, comprising: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.

10. A computer storage medium, wherein, The computer storage medium stores computer-executable instructions; when executed by a processor, the computer-executable instructions can implement the method described in any one of claims 1-4.

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