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 that a main control system obtains the actual rotation speed of a generator, and calculates the rotation speed deviation between the actual rotation speed and the rated rotation speed of the generator; the main control system obtains a reference value of a pitch angle of the variable pitch device based on the rotating speed deviation; and the master control system sends the reference value of the pitch angle and the pitch angle control instruction to the variable pitch device, and the variable pitch of the variable pitch device 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] The present invention relates to the technical field of variable pitch control, and in particular to a variable pitch control method and system for a wind power generation system based on rotation speed deviation. Background Art

[0002] At present, the variable pitch in the wind power generation system refers to the blades installed on the hub of the wind turbine generator set. The output power of the generator can be kept at the rated power by adjusting the pitch angle. Specifically, during the operation of the wind power generation system, when the output power is less than the rated power, the pitch angle remains at zero degrees without any adjustment; when the generator output power reaches the rated power, the pitch angle can be adjusted according to the change in output power to keep the generator output power at the rated power.

[0003] However, in the above method, the pitch angle can be adjusted only when the actual output power of the generator exceeds the rated power, which causes the power of the wind turbine to fluctuate, thereby affecting the power generation effect. Summary of the invention

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

[0005] To this end, the present invention proposes a variable pitch control method for a wind power generation system based on speed deviation. The main control system can control the variable pitch based on the speed deviation, thereby reducing the fluctuation of the wind turbine power, achieving stable output of the wind turbine power, and improving the power generation effect.

[0006] Another object of the present invention is to provide a variable pitch control system for a wind power generation system based on rotation speed deviation.

[0007] To achieve the above object, the present invention provides a variable pitch control method for a wind power generation system based on rotation speed deviation, the method comprising:

[0008] The main control system obtains the actual speed of the generator and calculates the speed deviation between the actual speed and the rated speed of the generator;

[0009] The main control system obtains a reference value of a pitch angle of a pitch-changing device based on the rotational speed deviation;

[0010] The main control system sends the reference value of the pitch angle and the pitch angle control instruction to the variable pitch device, and controls and adjusts the variable pitch of the variable pitch device.

[0011] The variable pitch control method of a wind power generation system based on rotation speed deviation according to an embodiment of the present invention may also have the following additional technical features:

[0012] In one embodiment of the present invention, the main control system obtains a reference value of a pitch angle of a pitch control device based on the rotation speed deviation, including:

[0013] The main control system obtains a proportional coefficient and an integral time constant of a pitch control PI regulator of a pitch control device;

[0014] The main control system obtains a reference value of the pitch angle of the variable pitch device based on the rotational speed deviation, the proportional coefficient and the integral time constant.

[0015] In one embodiment of the present invention, the main control system obtains a reference value of the pitch angle of the variable pitch device based on the speed deviation, the proportional coefficient and the integral time constant, including: the main control system obtains the reference value of the pitch angle of the variable pitch device by calculating through 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, the method further comprises:

[0017] The pitch control device receives the pitch angle reference value and the pitch angle control instruction sent by the main control system;

[0018] The pitch control device obtains an actual pitch angle value of the pitch control device;

[0019] The pitch control device controls and adjusts the pitch based on the actual pitch angle value and the reference value of the pitch angle.

[0020] In one embodiment of the present invention, the pitch control device comprises a hydraulic or electric motor.

[0021] To achieve the above object, the present invention provides, on the other hand, a variable pitch control system for a wind power generation system based on rotation speed deviation, the system comprising:

[0022] The speed deviation module is used for the main control system to obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator;

[0023] A pitch angle reference calculation module, used for the main control system to obtain a reference value of the pitch angle of the variable pitch device based on the rotation speed deviation;

[0024] The pitch control execution module is used for the main control system to send the reference value of the pitch angle and the pitch angle control instruction to the pitch device, so as to control and adjust the pitch of the pitch device.

[0025] In one embodiment of the present invention, the pitch angle reference calculation module is specifically used to:

[0026] The main control system obtains a proportional coefficient and an integral time constant of a pitch control PI regulator of a pitch control device;

[0027] The main control system obtains a reference value of the pitch angle of the variable pitch device based on the rotational speed deviation, the proportional coefficient and the integral time constant.

[0028] In one embodiment of the present invention, the system is further used for:

[0029] The pitch control device receives the pitch angle reference value and the pitch angle control instruction sent by the main control system;

[0030] The pitch control device obtains an actual pitch angle value of the pitch control device;

[0031] The pitch control device controls and adjusts the pitch based on the actual pitch angle value and the reference value of the pitch angle.

[0032] Another object of the present invention is to provide an electronic device, comprising:

[0033] at least one processor; and

[0034] a memory communicatively connected to the at least one processor; wherein,

[0035] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the methods described in the above aspect.

[0036] Another object of the present invention is to provide a computer storage medium, wherein the computer storage medium stores computer executable instructions; after the computer executable instructions are executed by a processor, the computer executes any one of the methods described in the above aspect.

[0037] The variable pitch control method and system of a wind power generation system based on speed deviation in the embodiments of the present invention can control the variable pitch based on the speed deviation by the main control system, thereby reducing the power fluctuation of the wind turbine set, achieving stable power output of the wind turbine set, and improving the power generation effect.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0040] Figure 1is a flow chart of a variable pitch control method for a wind power generation system based on a rotation speed deviation according to an embodiment of the present invention;

[0041] Figure 2 It is a structural diagram of a variable pitch control system of a wind power generation system based on rotation speed deviation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] The following describes a variable pitch control method and system for a wind power generation system based on rotation speed deviation according to an embodiment of the present invention with reference to the accompanying drawings.

[0045] Figure 1 The present invention is a flow chart of a variable pitch control method for a wind power generation system based on rotation speed deviation according to an embodiment of the present invention.

[0046] like Figure 1 As shown, the method includes:

[0047] S1, the main control system obtains the actual speed of the generator and calculates the speed deviation between the actual speed and the rated speed of the generator;

[0048] In one embodiment of the present invention, the main control system can obtain the actual speed of the generator based on the signal in the control strategy without adding additional sensors. In one embodiment of the present invention, the actual speed of the generator can be obtained based on a preset time interval. For example, assuming that the preset time interval is 5 minutes, the actual speed of the generator can be obtained at intervals of 5 minutes.

[0049] 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. rN is the rated speed of the generator, ω is the actual speed of the generator, then the speed deviation Δω r =ω r -ω rN .

[0051] S2, the main control system obtains a reference value of the pitch angle of the variable pitch device based on the speed deviation;

[0052] In one embodiment of the present invention, after the rotation speed deviation is obtained through the above steps, the main control system can obtain a reference value of the pitch angle of the variable pitch device based on the rotation speed deviation. In one embodiment of the present invention, before obtaining the reference value of the pitch angle based on the rotation speed deviation, the above method can also include: determining whether the rotation speed deviation is greater than a preset threshold value, if the rotation speed deviation is greater than the preset threshold value, then obtaining the reference value of the pitch angle based on the rotation speed deviation; if the rotation speed deviation is less than or equal to the preset threshold value, then there is no need to adjust the pitch angle.

[0053] And, in one embodiment of the present invention, the pitch control device may include hydraulic pressure or an electric motor.

[0054] Among them, in one embodiment of the present invention, the method for the main control system to obtain a reference value of the pitch angle of the variable pitch device based on the speed deviation may include: the main control system obtains the proportional coefficient and integral time constant of the pitch control PI regulator of the variable pitch device, and the main control system obtains the reference value of the pitch angle of the variable pitch device based on the speed deviation, the proportional coefficient and the integral time constant.

[0055] And, in one embodiment of the present invention, the method for the main control system to obtain a reference value of the pitch angle of the variable pitch device based on the rotational speed deviation, the proportional coefficient and the integral time constant may include: the main control system calculates the reference value of the pitch angle of the variable pitch device through 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:

[0056]

[0057] Among them, β * is the speed deviation, k pβ is the proportional coefficient of the pitch control PI regulator, t iβ is the integral time constant of the pitch control PI regulator.

[0058] S3, the main control system sends the reference value of the pitch angle and the pitch angle control instruction to the variable pitch device, and controls and adjusts the variable pitch of the variable pitch device.

[0059] In one embodiment of the present invention, after obtaining the reference value of the pitch angle through the above steps, the main control system can send the reference value of the pitch angle and the pitch angle control instruction to the pitch device to control and adjust the pitch of the pitch device.

[0060] In one embodiment of the present invention, after the pitch device receives the reference value of the pitch angle and the pitch angle control instruction sent by the main control system, the pitch device can adjust the pitch based on the reference value of the pitch angle.

[0061] Wherein, in one embodiment of the present invention, before the pitch device controls and adjusts the pitch based on the reference value of the pitch angle, the above method may further include: determining whether the reference value of the pitch angle belongs to the pitch angle variation range, if the reference value of the pitch angle belongs to the pitch angle variation range, then controlling and adjusting the 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 belong to the pitch angle variation range, 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 artificial experience.

[0062] And, in one embodiment of the present invention, the method for adjusting the pitch of the variable pitch device based on the reference value of the pitch angle may include: the variable pitch device obtains the actual pitch angle value of the variable pitch device; based on the actual pitch angle value and the reference value of the pitch angle, the variable pitch is controlled and adjusted. Among them, 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 of the mechanical part of the wind turbine generator set.

[0063] In one embodiment of the present invention, variable pitch control is performed through the rotational speed signal on the motor side, and the control speed is fast. When the wind power generation system is in windy weather, the variable 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 set, achieving a smooth output of the wind turbine set power, and improving the power generation effect.

[0064] In one embodiment of the present invention, the main control system obtains the actual speed of the generator and calculates the speed deviation between the actual speed and the rated speed of the generator; the main control system obtains the reference value of the pitch angle of the variable pitch device based on the speed deviation; the main control system sends the reference value of the pitch angle and the pitch angle control instruction to the variable pitch device to control and adjust the variable pitch of the variable pitch device. Thus, the variable pitch can be controlled based on the speed deviation, thereby reducing the fluctuation of the wind turbine power, achieving the stable output of the wind turbine power, and improving the power generation effect.

[0065] In order to implement the above embodiment, Figure 2 As shown, this embodiment also provides a wind power generation system pitch control system 10 based on rotation speed deviation, which includes a rotation speed deviation module 201, a pitch angle reference calculation module 202 and a pitch control execution module 203;

[0066] The speed deviation module 201 is used for the main control system to obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator;

[0067] A pitch angle reference calculation module 202 is used for the main control system to obtain a reference value of the pitch angle of the variable pitch device based on the rotation speed deviation;

[0068] The pitch control execution module 203 is used for the main control system to send the reference value of the pitch angle and the pitch angle control instruction to the pitch device, so as to control and adjust the pitch of the pitch device.

[0069] In the embodiment of the present disclosure, the pitch angle reference calculation module is specifically used for:

[0070] The main control system obtains the proportional coefficient and integral time constant of the pitch control PI regulator of the pitch control device;

[0071] The main control system obtains a reference value of the pitch angle of the variable pitch device based on the rotational speed deviation, the proportional coefficient and the integral time constant.

[0072] Furthermore, the pitch angle reference calculation module is also used for:

[0073] The main control system calculates the reference value of the pitch angle of the variable pitch device through a pitch angle reference value formula based on the rotational speed deviation, the proportional coefficient and the integral time constant.

[0074] Furthermore, the above system is also used for:

[0075] The variable pitch device receives a reference value of the pitch angle and a pitch angle control instruction sent by the main control system;

[0076] The pitch control device obtains an actual pitch angle value of the pitch control device;

[0077] The pitch device controls and adjusts the pitch based on the actual pitch angle value and the reference value of the pitch angle.

[0078] Furthermore, the above-mentioned variable pitch device includes hydraulic or electric motor.

[0079] According to the variable pitch control system of a wind power generation system based on speed deviation according to an embodiment of the present invention, the system can control the variable pitch based on the speed deviation, thereby reducing the fluctuation of the power of the wind turbine set, achieving a smooth output of the power of the wind turbine set, and improving the power generation effect.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A variable pitch control method for a wind power generation system based on rotation speed deviation, characterized in that: The method comprises: The main control system obtains the actual speed of the generator and calculates the speed deviation between the actual speed and the rated speed of the generator; The main control system obtains a reference value of a pitch angle of a pitch-changing device based on the rotational speed deviation; The main control system sends the reference value of the pitch angle and the pitch angle control instruction to the variable pitch device, and controls and adjusts the variable pitch of the variable pitch device.

2. The method according to claim 1, characterized in that The main control system obtains a reference value of a pitch angle of a pitch-changing device based on the rotation speed deviation, including: The main control system obtains a proportional coefficient and an integral time constant of a pitch control PI regulator of a pitch control device; The main control system obtains a reference value of the pitch angle of the variable pitch device based on the rotational speed deviation, the proportional coefficient and the integral time constant.

3. The method according to claim 2, characterized in that The main control system obtains a reference value of the pitch angle of the variable pitch device based on the speed deviation, the proportional coefficient and the integral time constant, including: the main control system calculates the reference value of the pitch angle of the variable pitch device through 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 method further comprises: The pitch control device receives the pitch angle reference value and the pitch angle control instruction sent by the main control system; The pitch control device obtains an actual pitch angle value of the pitch control device; The pitch control device controls and adjusts the pitch based on the actual pitch angle value and the reference value of the pitch angle.

5. The method according to any one of claims 1 to 4, characterized in that: The pitch control device comprises a hydraulic device or an electric motor.

6. A variable pitch control system for a wind power generation system based on rotation speed deviation, characterized in that: The system comprises: The speed deviation module is used for the main control system to obtain the actual speed of the generator and calculate the speed deviation between the actual speed and the rated speed of the generator; A pitch angle reference calculation module, used for the main control system to obtain a reference value of the pitch angle of the variable pitch device based on the rotation speed deviation; The pitch control execution module is used for the main control system to send the reference value of the pitch angle and the pitch angle control instruction to the pitch device, so as to control and adjust the pitch of the pitch device.

7. The system according to claim 6, characterized in that The pitch angle reference calculation module is specifically used for: The main control system obtains a proportional coefficient and an integral time constant of a pitch control PI regulator of a pitch control device; The main control system obtains a reference value of the pitch angle of the variable pitch device based on the rotational speed deviation, the proportional coefficient and the integral time constant.

8. The system according to claim 6, characterized in that The system is also used to: The pitch control device receives the pitch angle reference value and the pitch angle control instruction sent by the main control system; The pitch control device obtains an actual pitch angle value of the pitch control device; The pitch control device controls and adjusts the pitch based on the actual pitch angle value and the reference value of the pitch angle.

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, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 5.

10. A computer storage medium, wherein: The computer storage medium stores computer executable instructions; after the computer executable instructions are executed by the processor, the method according to any one of claims 1 to 5 can be implemented.

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