An optimization control method and system based on wind turbine operation conditions

Abstract

The present invention discloses an optimization control method and system based on the operation status of a wind turbine generator set, comprising the following steps: 1) real-time monitoring and collection of the operation status information and external environment information of the wind turbine generator set, wherein the operation status information of the wind turbine generator set includes the running status, shutdown status and output power P of the wind turbine generator set; 测 ; 2) Calculate the power judgment standard P based on the collected external environment information 标 ; 3) When P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them is controlled by PID control to change the pitch of the wind turbine rotor. This method and system can ensure the stable operation of the wind turbine.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power generation, and relates to an optimization control method and system based on the operation status of a wind turbine generator set. Background Art

[0002] The proportion of wind turbine capacity in use in China to renewable energy is gradually increasing, and it has become the third largest power source after thermal power and hydropower. Although wind power generation technology is relatively mature, there are still problems of wind turbines over-operating or wind turbines failing to reach rated operating conditions, especially in environments with high wind speeds. This will cause fluctuations in the speed and power of the generator in the wind turbine, affecting the quality of power and possibly causing generator overspeed failures. Therefore, current wind turbines require optimized control strategies to maintain stable and safe operation of wind turbines.

[0003] Among the various wind power generation equipment, variable-pitch variable-speed generator sets are the mainstream models, which mainly control the stable output power of wind turbines by adjusting the speed of the generator. The wind speed and direction of the external environment have a great influence on the speed of wind turbines. How to ensure the stable operation of wind turbines is the key to wind power technology. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide an optimization control method and system based on the operation status of a wind turbine generator set, which can ensure the stable operation of the wind turbine generator set.

[0005] To achieve the above object, the optimization control method based on the operation status of the wind turbine generator set according to the present invention comprises the following steps:

[0006] 1) Real-time monitoring and collection of wind turbine operating status information and external environment information, the wind turbine operating status information includes the wind turbine running status, shutdown status and output power P 测 ;

[0007] 2) Calculate the power judgment standard P based on the collected external environment information 标 ;

[0008] 3) When P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them is controlled by PID control to change the pitch of the wind turbine rotor.

[0009] The external environment information includes wind speed, air temperature and humidity information.

[0010] Calculate the power judgment standard P based on the collected external environment information 标,in,

[0011]

[0012]

[0013] P 标 =K·P

[0014] Among them, ρ is the air density of the external environment, P is the fan absorbed power, t is the air temperature, p f is the air pressure, ψ is the relative humidity, p b is the saturated water vapor pressure, A is the swept area of ​​the impeller, v is the wind speed, C p is the wind energy utilization coefficient, K is the adjustment coefficient, and the value range of K is 0.7-0.9.

[0015] According to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between the two is controlled by PID control to control the wind turbine rotor to change the pitch. The specific operation is as follows: according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them generates a pitch change instruction for the wind rotor, and then controls the pitch change reduction box according to the pitch change instruction of the wind rotor, and then controls the wind rotor of the wind turbine to perform pitch change operation.

[0016] The optimization control system based on the operation status of the wind turbine generator set described in the present invention includes:

[0017] The acquisition module is used to monitor and collect the operating status information and external environment information of the wind turbine in real time. The operating status information of the wind turbine includes the running status, shutdown status and output power P of the wind turbine. 测 ;

[0018] The calculation module is used to calculate the power judgment standard P according to the collected external environment information. 标 ;

[0019] Control module, used when P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them is controlled by PID control to change the pitch of the wind turbine rotor.

[0020] It also includes a temperature acquisition submodule, a humidity submodule and a wind speed acquisition submodule, through which the temperature, humidity and wind speed information of the air are measured respectively.

[0021] It also includes an output power acquisition submodule, through which the output power P of the wind turbine is measured. 测 .

[0022] The comparator judges P 测 >P 标 Is it true?

[0023] The present invention has the following beneficial effects:

[0024] The optimization control method and system based on the operation status of the wind turbine generator set according to the present invention calculates the power judgment standard P according to the collected external environment information during specific operation. 标 , and compare it with the output power P of the wind turbine 测 The PID control method is used to control the wind turbine rotor to perform pitch operation to improve the control performance of the wind power generation system and increase the stability of the wind turbine optimization control. It should be noted that when the external wind speed is too high, the pitch operation can prevent the wind turbine from rotating too fast, making the wind turbine power output more stable, and realizing the wind turbine to regulate the generator in the wind turbine to make it operate stably when the wind speed is too high, avoiding excess power generation and extending the service life of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of the method of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the device of the present invention;

[0027] Figure 3 This is the optimization control PID circuit diagram of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0029] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0030] refer to Figure 1 , Figure and Figure 3 The optimization control method based on the operation status of the wind turbine generator system of the present invention comprises the following steps:

[0031] 1) Real-time monitoring and collection of wind turbine operating status information and external environment information, wherein the wind turbine operating status information includes the running status, shutdown status and output power of the wind turbine, and the external environment information includes wind speed, air temperature and humidity, etc.;

[0032] 2) Calculate the power judgment standard P based on the collected external environment information 标 ,in,

[0033]

[0034]

[0035] P 标 =K·P

[0036] Among them, ρ is the air density of the external environment, P is the fan absorbed power, t is the air temperature, p f is the air pressure, ψ is the relative humidity, p b is the saturated water vapor pressure, A is the swept area of ​​the impeller, v is the wind speed, C p is the wind energy utilization coefficient, K is the adjustment coefficient, and the value range of K is 0.7-0.9, among which, the lower value is taken when the air quality is poor, and the higher value is taken when the air quality is good.

[0037] 3) Real-time monitoring of wind turbine output power P 测 , when P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation uses PID control to control the wind rotor of the wind turbine to perform pitch change operation, otherwise, the wind rotor of the wind turbine will not be operated.

[0038] The optimization control system based on the operation status of the wind turbine generator set described in the present invention includes:

[0039] The acquisition module is used to monitor and collect the operating status information and external environment information of the wind turbine in real time. The operating status information of the wind turbine includes the running status, shutdown status and output power P of the wind turbine. 测 ;

[0040] The calculation module is used to calculate the power judgment standard P according to the collected external environment information. 标 ;

[0041] Control module, used when P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them is controlled by PID control to change the pitch of the wind turbine rotor.

[0042] It also includes a temperature acquisition submodule, a humidity submodule and a wind speed acquisition submodule, through which the temperature, humidity and wind speed information of the air are measured respectively.

[0043] It also includes an output power acquisition submodule, through which the output power P of the wind turbine is measured. 测 .

[0044] The comparator judges P 测 >P 标 Is it true?

[0045] It should be understood that the above-mentioned embodiments are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An optimization control method based on the operation status of a wind turbine generator set, characterized in that: The following steps are involved: 1) Real-time monitoring and collection of wind turbine operating status information and external environment information, the wind turbine operating status information includes the wind turbine running status, shutdown status and output power P 测 ; 2) Calculate the power judgment standard P based on the collected external environment information 标 ; 3) When P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them is controlled by PID control to control the wind turbine rotor for pitch operation. Calculate the power judgment standard P based on the collected external environment information 标 ,in, P 标 =K·P Among them, ρ is the air density of the external environment, P is the fan absorbed power, t is the air temperature, p f is the air pressure, ψ is the relative humidity, p b is the saturated water vapor pressure, A is the swept area of ​​the impeller, v is the wind speed, C p is the wind energy utilization coefficient, K is the adjustment coefficient, and the value range of K is 0.7-0.

9.

2. The optimization control method based on the operation status of a wind turbine generator set according to claim 1, characterized in that: The external environment information includes wind speed, air temperature and humidity information.

3. The optimization control method based on the operation status of a wind turbine generator set according to claim 1, characterized in that: According to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between the two is controlled by PID control to control the wind turbine rotor to change the pitch. The specific operation is as follows: according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them generates a pitch change instruction for the wind rotor, and then controls the pitch change reduction box according to the pitch change instruction of the wind rotor, and then controls the wind rotor of the wind turbine to perform pitch change operation.

4. An optimization control system based on the operation status of a wind turbine generator set, characterized in that: include: The acquisition module is used to monitor and collect the operating status information and external environment information of the wind turbine in real time. The operating status information of the wind turbine includes the running status, shutdown status and output power P of the wind turbine. 测 ; The calculation module is used to calculate the power judgment standard P according to the collected external environment information. 标 ; Control module, used when P 测 >P 标 , then according to the output power P of the wind turbine 测 and judgment criteria P 标 The deviation between them is controlled by PID control to control the wind turbine rotor for pitch operation. Calculate the power judgment standard P based on the collected external environment information 标 ,in, P 标 =K·P Among them, ρ is the air density of the external environment, P is the fan absorbed power, t is the air temperature, p f is the air pressure, ∈ is the relative humidity, p b is the saturated water vapor pressure, A is the swept area of ​​the impeller, v is the wind speed, C p is the wind energy utilization coefficient, K is the adjustment coefficient, and the value range of K is 0.7-0.

9.

5. The optimization control system based on the operation status of the wind turbine generator set according to claim 4 is characterized in that: It also includes a temperature acquisition submodule, a humidity submodule and a wind speed acquisition submodule, through which the temperature, humidity and wind speed information of the air are measured respectively.

6. The optimization control system based on the operation status of the wind turbine generator set according to claim 4 is characterized in that: It also includes an output power acquisition submodule, through which the output power P of the wind turbine is measured. 测 .

7. The optimization control system based on the operation status of a wind turbine generator set according to claim 4, characterized in that: The comparator judges P 测 >P 标 Is it true?

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