Power control method and device for wind turbine generator set

Abstract

Provided are a power control method and device for a wind turbine. The power control method comprises: obtaining the ambient temperature, rotational speed, and pitch angle of the wind turbine during operation; determining the electrical boundary power of the wind turbine based on the ambient temperature and rotational speed; determining the stall boundary power of the wind turbine based on the ambient temperature, rotational speed, and pitch angle; determining a set power of the wind turbine based on the electrical boundary power and stall boundary power of the wind turbine; and controlling the output of the wind turbine according to the set power.

Description

Technical Field

[0001] The present disclosure relates to the field of wind power generation technology. More specifically, the present disclosure relates to a power control method and device for a wind turbine generator set. Background Art

[0002] Based on wind power market research and unit economic assessments, basic unit operating parameters, such as power, speed, and torque, are initially determined during the overall unit development phase. Subsequently, the unit's associated hardware equipment is selected and designed based on these operating parameters and relevant standards to ensure safe unit operation. During overall unit development, hardware and structure are typically designed within standard environmental parameters or ranges to meet both unit operating requirements and cost constraints. Consequently, the unit's hardware and structure have relatively strict and well-defined operating boundaries. However, because the performance of the hardware and structure can vary depending on the actual environment, the unit's power boundaries can also vary. Summary of the Invention

[0003] An exemplary embodiment of the present disclosure provides a power control method and device for a wind turbine generator set, so as to adjust the set power of the generator set according to the actual ambient temperature, increase power generation when the temperature is low, and ensure the safety of the generator set when the temperature is high, thereby improving the competitiveness of the generator set.

[0004] According to an exemplary embodiment of the present disclosure, a power control method for a wind turbine is provided, comprising: obtaining an ambient temperature, a rotational speed, and a pitch angle during operation of the wind turbine; determining an electrical boundary power of the wind turbine based on the ambient temperature and rotational speed; determining a stall boundary power of the wind turbine based on the ambient temperature, rotational speed, and pitch angle; determining a set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine; and controlling the output of the wind turbine according to the set power.

[0005] Optionally, determining the electrical boundary power of the wind turbine generator based on the ambient temperature and rotational speed may include: determining the electrical boundary current of key components of the wind turbine generator based on the ambient temperature, wherein the key components include a generator, a converter, and a cable; determining the minimum value of the electrical boundary current of the generator, the electrical boundary current of the converter, and the electrical boundary current of the cable as the electrical boundary current of the wind turbine generator; and determining the electrical boundary power of the wind turbine generator based on the ambient temperature, rotational speed, and the electrical boundary current of the wind turbine generator.

[0006] Optionally, determining the electrical boundary power of the wind turbine generator set based on the ambient temperature, rotational speed and electrical boundary current of the wind turbine generator set may include: obtaining the rated power, rated current and power loss of the wind turbine generator set; and calculating the electrical boundary power of the wind turbine generator set based on the rated power, rated current, power loss, generator winding temperature and the electrical boundary current, rotational speed and ambient temperature.

[0007] Optionally, when the key component is a generator, the electrical boundary current of the generator may include a first current limit and a second current limit of the generator, wherein the first current limit refers to a generator current limit based on stability, and the second current limit refers to a generator current limit based on temperature rise, and the temperature rise refers to the difference between the temperature of the generator winding and the temperature of the cooling medium in the operating state. wherein, determining the electrical boundary current of the key component of the wind turbine based on the ambient temperature may include: determining the generator current limit of the wind turbine based on stability based on the ambient temperature; determining the generator current limit of the wind turbine based on temperature rise based on the ambient temperature.

[0008] Optionally, determining the stability-based generator current limit of the wind turbine based on the ambient temperature may include: obtaining the unstable power of the generator of the wind turbine at the ambient temperature, the unstable power refers to the load upper limit of the generator; determining the current of the generator at the unstable power based on the unstable power; and determining the current value of the generator at the unstable power as the stability-based generator current limit.

[0009] Optionally, determining the temperature-rise-based generator current limit of the wind turbine generator based on the ambient temperature may include: determining a correction coefficient of the temperature-rise-based current limit of the generator according to the ambient temperature of different geographical locations; and calculating the temperature-rise-based generator current limit based on the ambient temperature, the rated current of the wind turbine generator, and the correction coefficient.

[0010] Optionally, when the key component is a converter, determining the electrical boundary current of the key component of the wind turbine generator set based on the ambient temperature may include: determining the converter current limit corresponding to the ambient temperature according to the correspondence between the ambient temperature and the converter current limit; and determining the converter current limit corresponding to the ambient temperature as the electrical boundary current of the converter.

[0011] Optionally, when the key component is a cable, determining the electrical boundary current of the key component of the wind turbine generator based on the ambient temperature may include: determining the range of the ambient temperature; and determining the current boundary of the cable of the wind turbine generator based on the range of the ambient temperature.

[0012] Optionally, determining the stall boundary power of the wind turbine generator set based on the ambient temperature, rotational speed and pitch angle may include: determining the stall wind speed corresponding to the rotational speed and pitch angle based on the correspondence between the rotational speed, pitch angle and stall wind speed; obtaining the wind energy utilization coefficient when the wind turbine generator set is running, the air density at the ambient temperature, and the impeller radius of the wind turbine generator set, wherein the air density at the ambient temperature is calculated based on the ambient temperature; and calculating the stall boundary power of the wind turbine generator set based on the stall wind speed, the wind energy utilization coefficient, the air density and the impeller radius.

[0013] Optionally, determining the set power of the wind turbine generator based on the electrical boundary power and stall boundary power of the wind turbine generator may include: comparing the electrical boundary power and the stall boundary power of the wind turbine generator; and taking the minimum value of the electrical boundary power and the stall boundary power as the set power of the wind turbine generator.

[0014] Optionally, controlling the output of the wind turbine generator set according to the set power may include: if the set power is greater than the rated power, controlling the wind turbine generator set to output in an over-generation state; if the set power is less than the rated power, controlling the wind turbine generator set to output in a limited power state.

[0015] Optionally, after determining the set power of the wind turbine generator based on the electrical boundary power and stall boundary power of the wind turbine generator, it may also include: inputting the set power as the active power upper limit of the wind turbine generator into the management system, and the management system is used to perform power scheduling according to the grid demand and the active power upper limit.

[0016] According to an exemplary embodiment of the present disclosure, a power control device for a wind turbine is provided, comprising: a data acquisition unit configured to acquire an ambient temperature, a rotational speed, and a pitch angle during operation of the wind turbine; a first power determination unit configured to determine an electrical boundary power of the wind turbine based on the ambient temperature and rotational speed; a second power determination unit configured to determine a stall boundary power of the wind turbine based on the ambient temperature, rotational speed, and pitch angle; a set power determination unit configured to determine a set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine; and an output control unit configured to control the output of the wind turbine according to the set power.

[0017] Optionally, the first power determination unit can be configured to: determine the electrical boundary current of key components of the wind turbine based on the ambient temperature, wherein the key components include a generator, a converter, and a cable; determine the minimum value of the electrical boundary current of the generator, the electrical boundary current of the converter, and the electrical boundary current of the cable as the electrical boundary current of the wind turbine; determine the electrical boundary power of the wind turbine based on the ambient temperature, the rotational speed, and the electrical boundary current of the wind turbine.

[0018] Optionally, the first power determination unit can be configured to: obtain the rated power, rated current and power loss of the wind turbine; and calculate the electrical boundary power of the wind turbine based on the rated power, rated current, power loss, generator winding temperature, and the electrical boundary current, speed and ambient temperature of the wind turbine.

[0019] Optionally, when the key component is a generator, the electrical boundary current of the generator may include a first current limit and a second current limit of the generator, wherein the first current limit refers to a generator current limit based on stability, and the second current limit refers to a generator current limit based on temperature rise, and the temperature rise refers to the difference between the temperature of the generator winding and the temperature of the cooling medium in the operating state, wherein the first power determination unit may include a first determination unit, which is configured to: determine the generator current limit of the wind turbine based on stability based on the ambient temperature; determine the generator current limit of the wind turbine based on temperature rise based on the ambient temperature.

[0020] Optionally, the first determination unit can be configured to: obtain the unstable power of the generator of the wind turbine generator at the ambient temperature, where the unstable power refers to the upper limit of the load of the generator; determine the current of the generator at the unstable power based on the unstable power; and determine the current value of the generator at the unstable power as a stability-based generator current limit.

[0021] Optionally, the first determination unit may be configured to: determine a correction coefficient of the current limit of the generator temperature rise according to the ambient temperature in different geographical locations; and calculate the generator current limit based on the temperature rise based on the ambient temperature, the rated current of the wind turbine, and the correction coefficient.

[0022] Optionally, the first power determination unit may include a second determination unit, which is configured to: when the key component is a converter, determine the converter current limit corresponding to the ambient temperature based on the correspondence between the ambient temperature and the converter current limit; and determine the converter current limit corresponding to the ambient temperature as the electrical boundary current of the converter.

[0023] Optionally, the first power determination unit may include a third determination unit configured to: when the key component is a cable, determine the range of the ambient temperature; and determine the current boundary of the cable of the wind turbine generator based on the range of the ambient temperature.

[0024] Optionally, the second power determination unit can be configured to: determine the stall wind speed corresponding to the rotational speed and the pitch angle based on the correspondence between the rotational speed, the pitch angle, and the stall wind speed; obtain the wind energy utilization coefficient when the wind turbine is running, the air density at the ambient temperature, and the impeller radius of the wind turbine, wherein the air density at the ambient temperature is calculated based on the ambient temperature; calculate the stall boundary power of the wind turbine based on the stall wind speed, the wind energy utilization coefficient, the air density, and the impeller radius.

[0025] Optionally, the set power determination unit may be configured to: compare the electrical boundary power and the stall boundary power of the wind turbine generator set; and take the minimum value of the electrical boundary power and the stall boundary power as the set power of the wind turbine generator set.

[0026] Optionally, the output control unit may be configured to: if the set power is greater than the rated power, control the wind turbine to output in an over-generation state; if the set power is less than the rated power, control the wind turbine to output in a limited power state.

[0027] Optionally, the power control device may also include: a data management unit, configured to input the set power as the active power upper limit of the wind turbine generator set into a management system after determining the set power of the wind turbine generator set based on the electrical boundary power and stall boundary power of the wind turbine generator set, and the management system is used to perform power scheduling according to the grid demand and the active power upper limit.

[0028] According to an exemplary embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, a power control method for a wind turbine according to an exemplary embodiment of the present disclosure is implemented.

[0029] According to an exemplary embodiment of the present disclosure, a computing device is provided, comprising: at least one processor; and at least one memory storing computer program instructions. When the computer program instructions are executed by the at least one processor, a power control method for a wind turbine generator system according to an exemplary embodiment of the present disclosure is implemented.

[0030] According to an exemplary embodiment of the present disclosure, a computer program product is provided. Instructions in the computer program product can be executed by a processor of a computer device to implement a power control method of a wind turbine according to an exemplary embodiment of the present disclosure.

[0031] According to the power control method and device of the wind turbine set of the exemplary embodiment of the present disclosure, by obtaining the ambient temperature, rotational speed and pitch angle when the wind turbine set is in operation, the electrical boundary power of the wind turbine set is determined based on the ambient temperature and rotational speed, the stall boundary power of the wind turbine set is determined based on the ambient temperature, rotational speed and pitch angle, the set power of the wind turbine set is determined based on the electrical boundary power and stall boundary power of the wind turbine set, and the output of the wind turbine set is controlled according to the set power, thereby adjusting the set power of the unit according to the actual ambient temperature, increasing the power generation when the temperature is low, and ensuring the safety of the unit when the temperature is high, thereby improving the competitiveness of the unit.

[0032] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description and in part will be apparent from the description, or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other objects and features of the exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which exemplarily illustrate the embodiments, in which:

[0034] Figure 1A A flow chart showing a power control method of a wind turbine according to an exemplary embodiment of the present disclosure;

[0035] Figure 1B A logic diagram illustrating power control of a wind turbine according to an exemplary embodiment of the present disclosure is shown;

[0036] Figure 2 A block diagram showing a power control device for a wind turbine generator system according to an exemplary embodiment of the present disclosure is shown;

[0037] Figure 3 A block diagram illustrating a first power determination unit according to an exemplary embodiment of the present disclosure is shown;

[0038] Figure 4 A block diagram showing a power control device for a wind turbine according to another exemplary embodiment of the present disclosure; and

[0039] Figure 5 A schematic diagram illustrating a computing device according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] Reference will now be made in detail to the exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments will be described below with reference to the drawings to explain the present disclosure.

[0041] Figure 1AA flow chart showing a power control method for a wind turbine according to an exemplary embodiment of the present disclosure is shown. Figure 1B A logic diagram illustrating power control of a wind turbine according to an exemplary embodiment of the present disclosure is shown.

[0042] 1 , in step S101 , the ambient temperature, rotation speed and pitch angle of the wind turbine during operation are obtained.

[0043] In an exemplary embodiment of the present disclosure, the ambient temperature can be obtained by an ambient temperature sensor installed outside the nacelle of the wind turbine. Specifically, depending on the configuration of the wind turbine, there are two situations: one is equipped with one set of ambient temperature sensors, and the other is equipped with two sets of ambient temperature sensors. If equipped with one set of sensors, when the sensor and temperature data are normal, the temperature data is used to calculate the electrical boundary power, otherwise no calculation or output is performed; if equipped with two sets of sensors, first, if it is determined that the default sensor and temperature data are normal, the temperature data is used to calculate the electrical boundary power, otherwise, if it is determined that the backup sensor and temperature data are normal, the temperature data is used to calculate the electrical boundary power, otherwise no calculation or output is performed.

[0044] In step S102 , the electrical boundary power of the wind turbine is determined based on the ambient temperature and the rotation speed.

[0045] In an exemplary embodiment of the present disclosure, when determining the electrical boundary power of a wind turbine based on ambient temperature and rotational speed, the electrical boundary currents of key components of the wind turbine may first be determined based on the ambient temperature. Here, the key components may include at least one of a generator, a converter, and a cable. The minimum value of the electrical boundary currents of the key components is then determined as the electrical boundary current of the wind turbine. Furthermore, the electrical boundary power of the wind turbine is determined based on the ambient temperature, rotational speed, and electrical boundary current of the wind turbine. For example, if the generator, converter, and cable are all determined as key components, the minimum value of the electrical boundary current of the generator, the electrical boundary current of the converter, and the electrical boundary current of the cable may be determined as the electrical boundary current of the wind turbine.

[0046] In other words, the current tolerance is a key factor influencing the electrical power tolerance of wind turbines. For example, the generator's current tolerance is primarily affected by altitude and ambient temperature, given the selected model. Higher altitudes and ambient temperatures reduce the current it can withstand and the settable power. The converter's current tolerance is also primarily affected by ambient temperature, given the selected model. Higher temperatures reduce the current it can withstand and the settable power. The cable's current tolerance is also primarily affected by ambient temperature, given the selected model. Higher ambient temperatures reduce the current it can withstand and the settable power.

[0047] In an exemplary embodiment of the present disclosure, when determining the electrical boundary power of a wind turbine generator set based on the ambient temperature, rotational speed and electrical boundary current of the wind turbine generator set, the rated power, rated current and power loss of the wind turbine generator set can be obtained first, and then the electrical boundary power of the wind turbine generator set can be calculated based on the rated power, rated current, power loss, generator winding temperature and electrical boundary current, rotational speed and ambient temperature of the wind turbine generator set.

[0048] For example, the electrical boundary power of a wind turbine can be calculated according to the following formula.

[0049]

[0050] Here, Pwr_ Elec Represents the electrical boundary power, P rate Indicates the rated power of the wind turbine, I elec represents the electrical boundary current, T test represents the generator winding temperature in the laboratory test, t represents the ambient temperature, I rate represents the rated current of the wind turbine, Pwr_Loss represents the power loss of the wind turbine, ω represents the current speed of the wind turbine, and ωrate represents the rated speed of the wind turbine. In other words, the electrical boundary power at different temperatures t is proportional to the power calculated based on the electrical current boundary minus the power loss of the wind turbine.

[0051] In an exemplary embodiment of the present disclosure, when the key component is a generator, the generator's electrical boundary current includes a first current limit and a second current limit. Here, the first current limit refers to the generator current limit based on stability, and the second current limit refers to the generator current limit based on temperature rise. Temperature rise refers to the difference between the temperature of the generator winding and the temperature of the cooling medium during operation. In other words, when calculating the generator current boundary, the current boundaries that need to be considered primarily include the current limit imposed by temperature rise and the current limit imposed by stability.

[0052] In an exemplary embodiment of the present disclosure, when determining the electrical boundary current of key components of a wind turbine generator based on the ambient temperature, the stability-based generator current limit of the wind turbine generator can be determined first based on the ambient temperature, and then the temperature-rise-based generator current limit of the wind turbine generator can be determined based on the ambient temperature.

[0053] In an exemplary embodiment of the present disclosure, when determining a stability-based generator current limit for a wind turbine based on ambient temperature, the wind turbine generator's instability power at ambient temperature may be first obtained. Based on the instability power, the generator current at the instability power is determined. The generator current at the instability power is then determined as the stability-based generator current limit. Here, the instability power refers to the upper limit of the generator's load.

[0054] Generator load has a certain upper limit. When this value is exceeded, the generator is at risk of instability. This upper limit is called the instability power. The instability power of the motor varies at different ambient temperatures and is positively correlated with temperature.

[0055] For example, according to formula I unstability =((1-T test *0.0011)*I rate ) / (P rate *(P test / (1-T unstability *0.0011))Calculate the generator current at the unstable power. Here, I unstability Indicates the current of the generator under unstable power, T test Indicates the generator winding temperature, I rate Indicates the rated current of the wind turbine, P rate Indicates the rated power of the wind turbine, P test Indicates the unstable power, T unstability Indicates the instability temperature.

[0056] In an exemplary embodiment of the present disclosure, when determining the temperature-rise-based generator current limit of a wind turbine generator based on the ambient temperature, a correction coefficient of the temperature-rise-based current limit of the generator can be first determined according to the ambient temperature of different geographical locations, and then the temperature-rise-based generator current limit can be calculated based on the ambient temperature, the rated current of the wind turbine generator, and the correction coefficient.

[0057] Temperature rise is the difference between the winding temperature and the cooling medium temperature when the generator is operating under certain conditions. This difference has an upper limit based on the design level, and the temperature rise values ​​corresponding to different currents are the temperature rise curve. Therefore, to ensure that the temperature rise meets the requirements, the current must be within a certain range. Because temperature rise is also affected by altitude and ambient temperature, the temperature rise measured at different altitudes and ambient temperatures will be different, requiring certain corrections. Therefore, when calculating the current range that meets the temperature rise requirements, it is necessary to make certain corrections based on different altitudes and temperatures. An example of the corresponding relationship between correction factors and altitude and temperature, provided by the electrical professional team after testing, is shown in Table 1.

[0058] Table 1 Generator temperature rise current limit correction coefficient

[0059]

[0060] As shown in Table 1, altitude is divided into four levels. The altitude closest to the actual altitude (called the equivalent altitude, ASL) is used to find the correction factor. Therefore, when calculating the correction value K, first determine the equivalent altitude, ASL, and its column position, L (L = 1 / 2 / 3 / 4). Then, linear interpolation is performed based on the temperature to calculate the correction value K.

[0061] For example, according to the formula Calculate the correction factor of the generator temperature rise current limit. Here, K represents the correction factor of the generator temperature rise current limit, K 1L Indicates the correction coefficient of the generator temperature rise current limit at temperature T1, K 2L It represents the correction coefficient of the generator temperature rise current limit at T2 temperature, t represents the ambient temperature, and T1 represents the correction coefficient K of the generator temperature rise current limit. 1L The corresponding temperature, T2 represents the correction coefficient K of the generator temperature rise current limit 2L The corresponding temperature. Then, according to the formula Calculate the generator current limit based on temperature rise. Here, I TempUp Indicates the generator current limit based on temperature rise, T test represents the generator winding temperature, t represents the ambient temperature, I rate It represents the rated current of the wind turbine, and K represents the correction factor.

[0062] In an exemplary embodiment of the present disclosure, when the key component is a converter, when determining the electrical boundary current of the key component of the wind turbine generator set based on the ambient temperature, the converter current limit corresponding to the ambient temperature can be first determined based on the correspondence between the ambient temperature and the converter current limit, and then the converter current limit corresponding to the ambient temperature can be determined as the electrical boundary current of the converter.

[0063] For example, when the ambient temperature is within the first range (e.g., t<=T3), the current boundary of the wind turbine converter is determined to be the first current limit I3 of the converter. When the ambient temperature is within the second range (e.g., T3<t<=T4), the current boundary of the wind turbine converter is determined to be the first current limit I3 of the converter. Calculate the current boundary of the wind turbine converter. Here, I cnv represents the current boundary of the converter of the wind turbine generator set, I3 represents the first current limit of the converter, I4 represents the second current limit of the converter, t represents the ambient temperature, T3 represents the upper limit temperature of the first range, and T4 represents the upper limit temperature of the second range.

[0064] In an exemplary embodiment of the present disclosure, when the key component is a cable, when determining the electrical boundary current of the key component of the wind turbine generator based on the ambient temperature, the range of the ambient temperature can be determined first, and then the current boundary of the cable of the wind turbine generator can be determined based on the range of the ambient temperature.

[0065] For example, when the ambient temperature is in the third range (e.g., t<=T5), the current boundary of the cable of the wind turbine is determined to be the third current limit I5. When the ambient temperature is in the fourth range (e.g., T5<t<=T6), the current limit I5 can be calculated according to the formula Calculate the current boundary of the wind turbine cable. Here, I cab represents the current boundary of the cable of the wind turbine, I5 represents the third current limit, I6 represents the fourth current limit, t represents the ambient temperature, T5 represents the upper limit temperature of the third range, and T6 represents the upper limit temperature of the fourth range. When the ambient temperature is in the fifth range (for example, t>T6), the following formula can be used: Calculate the current boundary of the wind turbine cable, where I cab represents the current boundary of the cable of the wind turbine generator set, I6 represents the fourth current limit, I7 represents the fifth current limit, t represents the ambient temperature, T6 represents the upper limit temperature of the fourth range, and T7 represents the upper limit temperature of the fifth range.

[0066] In step S103 , the stall limit power of the wind turbine is determined based on the ambient temperature, the rotation speed and the pitch angle.

[0067] In an exemplary embodiment of the present disclosure, when determining the stall limit power of a wind turbine based on ambient temperature, rotational speed, and pitch angle, the stall wind speed corresponding to the rotational speed and pitch angle can be first determined based on the corresponding relationship among the rotational speed, pitch angle, and stall wind speed. Furthermore, the wind energy utilization coefficient during operation of the wind turbine, the air density at ambient temperature, and the rotor radius of the wind turbine are obtained. The stall limit power of the wind turbine is then calculated based on the stall wind speed, wind energy utilization coefficient, air density, and rotor radius. Here, the air density at ambient temperature is calculated based on the ambient temperature.

[0068] When determining the stall wind speed corresponding to the speed and pitch angle based on the correspondence between the speed, pitch angle, and stall wind speed, since the stall wind speed has a linear relationship with both the speed and pitch angle, in order to avoid too many parameters, curve fitting can be performed first, and then the stall wind speed can be calculated in real time based on the fitting relationship between the stall wind speed, the speed, and the pitch angle.

[0069] The wind energy utilization coefficient Cp during unit operation can be obtained by looking up the table based on the real-time pitch angle and blade tip speed ratio. The horizontal axis of the table is the pitch angle (PitAng), the vertical axis is the blade tip speed ratio (Lamda), and the corresponding value in the middle is Cp / (Lamda). 3 .

[0070] Since air density is affected by altitude and temperature, it is necessary to calculate the air density based on the actual altitude and real-time temperature on site.

[0071] For example, according to the formula Here, ρ represents the air density, ASL represents the equivalent altitude, H represents the unit tower height, and t represents the ambient temperature. After calculating the stall wind speed and air density, the air density can be calculated according to the formula Pwr stall =0.5*ρ*PI*Cp*R 2 *WindSpd_Stall 3 Calculate the stall boundary power of the wind turbine. Here, Pwr stall represents the stall boundary power of the wind turbine, ρ represents the air density, PI represents the pi, Cp represents the wind energy utilization coefficient, R represents the impeller radius, and WindSpd_Stall represents the stall wind speed.

[0072] In step S104 , the set power of the wind turbine generator is determined based on the electrical boundary power and the stall boundary power of the wind turbine generator.

[0073] In an exemplary embodiment of the present disclosure, when determining the set power of a wind turbine generator set based on the electrical boundary power and the stall boundary power of the wind turbine generator set, the electrical boundary power and the stall boundary power of the wind turbine generator set can be compared first, and then the minimum value of the electrical boundary power and the stall boundary power can be used as the set power of the wind turbine generator set.

[0074] In step S105, the output of the wind turbine is controlled according to the set power.

[0075] In an exemplary embodiment of the present disclosure, when controlling the output of a wind turbine generator set according to a set power, if the set power is greater than the rated power, the wind turbine generator set is controlled to output in an over-generation state; if the set power is less than the rated power, the wind turbine generator set is controlled to output in a limited power state.

[0076] In an exemplary embodiment of the present disclosure, Figure 1B As shown, after determining the wind turbine's set power based on its electrical boundary power and stall boundary power, the set power can also be input into the management system (energy management platform) as the wind turbine's active power upper limit. Here, the management system is used to dispatch power based on grid demand and the active power upper limit. For example, the management system can set the set power during overgeneration to no more than 1.05 times the original rated power.

[0077] In addition, according to an exemplary embodiment of the present disclosure, a computer-readable storage medium is further provided, on which computer program instructions are stored. When the computer program instructions are executed, the power control method of the wind turbine generator system according to the exemplary embodiment of the present disclosure is implemented.

[0078] In an exemplary embodiment of the present disclosure, the computer-readable storage medium may carry one or more programs, and when the computer program instructions in the program are executed, the following steps can be implemented: obtaining the ambient temperature, rotational speed and pitch angle when the wind turbine is running; determining the electrical boundary power of the wind turbine based on the ambient temperature; determining the stall boundary power of the wind turbine based on the ambient temperature, rotational speed and pitch angle; determining the set power of the wind turbine based on the electrical boundary power and stall boundary power of the wind turbine; and controlling the output of the wind turbine according to the set power.

[0079] Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or components, or any combination thereof. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In embodiments of the present disclosure, a computer-readable storage medium can be any tangible medium that contains or stores a computer program that can be used by or in conjunction with an instruction execution system, device or component. The computer program contained on the computer-readable storage medium can be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof. The computer-readable storage medium can be contained in any device; it can also exist independently without being assembled into the device.

[0080] In addition, according to an exemplary embodiment of the present disclosure, a computer program product is also provided. Instructions in the computer program product can be executed by a processor of a computer device to implement the power control method of a wind turbine according to an exemplary embodiment of the present disclosure.

[0081] The above has been combined Figure 1A and Figure 1B The power control method of a wind turbine generator system according to an exemplary embodiment of the present disclosure is described. Figures 2 to 4 A power control device of a wind turbine generator system and units thereof according to an exemplary embodiment of the present disclosure are described.

[0082] Figure 2 A block diagram of a power control device for a wind turbine according to an exemplary embodiment of the present disclosure is shown. Figure 3 A block diagram of a first power determination unit according to an exemplary embodiment of the present disclosure is shown. Figure 4 A block diagram illustrating a power control device for a wind turbine according to another exemplary embodiment of the present disclosure is shown.

[0083] Reference Figure 2 The power control device of the wind turbine generator system includes a data acquisition unit 21 , a first power determination unit 22 , a second power determination unit 23 , a set power determination unit 24 and an output control unit 25 .

[0084] The data acquisition unit 21 is configured to acquire the ambient temperature, rotation speed and pitch angle of the wind turbine when the wind turbine is running.

[0085] The first power determination unit 22 is configured to determine the electrical boundary power of the wind turbine generator system based on the ambient temperature and the rotation speed.

[0086] In an exemplary embodiment of the present disclosure, the first power determination unit 22 may be configured to: determine the electrical boundary currents of key components of the wind turbine based on the ambient temperature, where the key components may include at least one of a generator, a converter, and a cable; determine the minimum value of the electrical boundary currents of the key components as the electrical boundary current of the wind turbine; and determine the electrical boundary power of the wind turbine based on the ambient temperature, the rotational speed, and the electrical boundary current of the wind turbine. If the generator, the converter, and the cable are all determined as key components, the minimum value of the electrical boundary current of the generator, the electrical boundary current of the converter, and the electrical boundary current of the cable may be determined as the electrical boundary current of the wind turbine.

[0087] In an exemplary embodiment of the present disclosure, the first power determination unit 22 can be configured to: obtain the rated power, rated current and power loss of the wind turbine generator set; and calculate the electrical boundary power of the wind turbine generator set based on the rated power, rated current, power loss, generator winding temperature, and electrical boundary current, speed and ambient temperature of the wind turbine generator set.

[0088] In an exemplary embodiment of the present disclosure, when the key component is a generator, the electrical boundary current of the generator may include a first current limit and a second current limit of the generator, wherein the first current limit refers to a generator current limit based on stability, and the second current limit refers to a generator current limit based on temperature rise, and the temperature rise refers to the difference between the temperature of the generator winding and the temperature of the cooling medium in the operating state.

[0089] In an exemplary embodiment of the present disclosure, the first power determining unit 22 may include at least one of a first determining unit 221 , a second determining unit 222 , and a third determining unit 223 . Figure 3 An example is shown in which the first power determination unit 22 includes a first determination unit 221 , a second determination unit 222 , and a third determination unit 223 .

[0090] In an exemplary embodiment of the present disclosure, the first determining unit 221 may be configured to determine a stability-based generator current limit of the wind turbine based on ambient temperature; and determine a temperature-rise-based generator current limit of the wind turbine based on ambient temperature.

[0091] In an exemplary embodiment of the present disclosure, the first determination unit 221 can be configured to: obtain the unstable power of the generator of the wind turbine generator at ambient temperature, where the unstable power refers to the load upper limit of the generator; determine the current of the generator at the unstable power based on the unstable power; and determine the current value of the generator at the unstable power as the generator current limit based on stability.

[0092] In an exemplary embodiment of the present disclosure, the first determination unit 221 can be configured to: determine a correction coefficient of the current limit of the generator temperature rise according to the ambient temperature of different geographical locations; and calculate the generator current limit based on the temperature rise based on the ambient temperature, the rated current of the wind turbine, and the correction coefficient.

[0093] In an exemplary embodiment of the present disclosure, the second determination unit 222 can be configured to: when the key component is a converter, determine the converter current limit corresponding to the ambient temperature based on the correspondence between the ambient temperature and the converter current limit; and determine the converter current limit corresponding to the ambient temperature as the electrical boundary current of the converter.

[0094] In an exemplary embodiment of the present disclosure, the third determining unit 223 may be configured to: when the key component is a cable, determine the range of the ambient temperature; and determine the current boundary of the cable of the wind turbine based on the range of the ambient temperature.

[0095] The second power determination unit 23 is configured to determine the stall limit power of the wind turbine based on the ambient temperature, the rotation speed and the pitch angle.

[0096] In an exemplary embodiment of the present disclosure, the second power determination unit 23 can be configured to: determine the stall wind speed corresponding to the rotational speed and the pitch angle based on the correspondence between the rotational speed, the pitch angle, and the stall wind speed; obtain the wind energy utilization coefficient, the air density at the ambient temperature, and the impeller radius of the wind turbine when the wind turbine is running, wherein the air density at the ambient temperature is calculated based on the ambient temperature; and calculate the stall boundary power of the wind turbine based on the stall wind speed, the wind energy utilization coefficient, the air density, and the impeller radius.

[0097] The set power determination unit 24 is configured to determine the set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine.

[0098] In an exemplary embodiment of the present disclosure, the set power determination unit 24 may be configured to: compare the electrical boundary power and the stall boundary power of the wind turbine; and use the minimum value of the electrical boundary power and the stall boundary power as the set power of the wind turbine.

[0099] The output control unit 25 is configured to control the output of the wind turbine generator system according to the set power.

[0100] In an exemplary embodiment of the present disclosure, the output control unit 25 may be configured to: if the set power is greater than the rated power, control the wind turbine to output in an over-generation state; if the set power is less than the rated power, control the wind turbine to output in a limited power state.

[0101] In an exemplary embodiment of the present disclosure, Figure 4 As shown, in addition to the data acquisition unit 21, the first power determination unit 22, the second power determination unit 23, the set power determination unit 24 and the output control unit 25, the power control device may also include: a data management unit 26 is configured to, after determining the set power of the wind turbine generator based on the electrical boundary power and the stall boundary power of the wind turbine generator, input the set power as the upper limit of the active power of the wind turbine generator to the management system, and the management system is used to perform power scheduling according to the grid demand and the active power upper limit.

[0102] The above has been combined Figures 2 to 4 The power control device of the wind turbine generator system according to the exemplary embodiment of the present disclosure is described. Figure 5 A computing device according to an exemplary embodiment of the present disclosure is described.

[0103] Figure 5 A schematic diagram illustrating a computing device according to an exemplary embodiment of the present disclosure.

[0104] Reference Figure 5 According to the exemplary embodiment of the present disclosure, the computing device 5 includes a memory 51 and a processor 52. The memory 51 stores computer program instructions. When the computer program instructions are executed by the processor 52, the power control method of the wind turbine according to the exemplary embodiment of the present disclosure is implemented.

[0105] In an exemplary embodiment of the present disclosure, when the computer program instructions are executed by the processor 52, the following steps can be implemented: obtaining the ambient temperature, rotational speed and pitch angle when the wind turbine is in operation; determining the electrical boundary power of the wind turbine based on the ambient temperature and rotational speed; determining the stall boundary power of the wind turbine based on the ambient temperature, rotational speed and pitch angle; determining the set power of the wind turbine based on the electrical boundary power and stall boundary power of the wind turbine; and controlling the output of the wind turbine according to the set power.

[0106] Figure 5 The computing device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0107] The above has been referred to Figures 1 to Figure 5 The power control method and apparatus of a wind turbine generator system according to an exemplary embodiment of the present disclosure are described. However, it should be understood that: Figures 2 to 4 The power control device of the wind turbine generator set and its units shown in the figure can be respectively configured as software, hardware, firmware or any combination of the above items to perform specific functions. Figure 5 The computing device shown in is not limited to including the components shown above, but some components may be added or deleted as needed, and the above components may also be combined.

[0108] According to the power control method and device of the wind turbine set of the exemplary embodiment of the present disclosure, by obtaining the ambient temperature, rotational speed and pitch angle when the wind turbine set is in operation, the electrical boundary power of the wind turbine set is determined based on the ambient temperature and rotational speed, the stall boundary power of the wind turbine set is determined based on the ambient temperature, rotational speed and pitch angle, the set power of the wind turbine set is determined based on the electrical boundary power and stall boundary power of the wind turbine set, and the output of the wind turbine set is controlled according to the set power, thereby adjusting the power setting of the wind turbine set according to the actual ambient temperature, increasing the power generation when the temperature is low, and ensuring the safety of the wind turbine set when the temperature is high, thereby improving the competitiveness of the wind turbine set.

[0109] While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims.

Claims

1. A power control method for a wind turbine generator system, characterized in that: The power control method comprises: Obtain the ambient temperature, speed and pitch angle of the wind turbine when it is running; determining the electrical boundary power of the wind turbine generator set based on the ambient temperature and the rotational speed; determining the stall boundary power of the wind turbine generator set based on the ambient temperature, rotational speed and pitch angle; Determining the set power of the wind turbine generator set based on the electrical boundary power and stall boundary power of the wind turbine generator set; Control the output of the wind turbine generator set according to the set power, The step of determining the electrical boundary power of the wind turbine generator system based on the ambient temperature and the rotational speed includes: Determining electrical boundary currents of key components of the wind turbine generator system based on the ambient temperature, wherein the key components include a generator, a converter, and a cable; Determine the minimum value among the electrical boundary current of the generator, the electrical boundary current of the converter and the electrical boundary current of the cable as the electrical boundary current of the wind turbine generator set; Determine the electrical boundary power of the wind turbine generator set based on the ambient temperature, the rotation speed and the electrical boundary current of the wind turbine generator set; Among them, the electrical boundary power of the wind turbine generator set is calculated based on the rated power of the wind turbine generator set, the electrical boundary current of the wind turbine generator set, the generator winding temperature tested in the laboratory, the ambient temperature, the rated current of the wind turbine generator set, the power loss of the wind turbine generator set, the current speed of the wind turbine generator set, and the rated speed of the wind turbine generator set.

2. The power control method according to claim 1, wherein: When the key component is a generator, the electrical boundary current of the generator includes a first current limit value and a second current limit value of the generator. The first current limit refers to the generator current limit based on stability, and the second current limit refers to the generator current limit based on temperature rise. The temperature rise refers to the difference between the temperature of the generator winding and the temperature of the cooling medium in the operating state. Wherein, determining the electrical boundary current of the key components of the wind turbine generator set based on the ambient temperature includes: determining a stability-based generator current limit of the wind turbine generator system based on the ambient temperature; A temperature-rise-based generator current limit of the wind turbine is determined based on the ambient temperature.

3. The power control method according to claim 2, wherein: The step of determining a stability-based generator current limit of the wind turbine generator based on the ambient temperature includes: Obtaining the unstable power of the generator of the wind turbine generator set at the ambient temperature, where the unstable power refers to the load upper limit of the generator; determining a current of the generator at the unstable power based on the unstable power; A current value of the generator at the unstable power is determined as a stability-based generator current limit.

4. The power control method according to claim 2, wherein: The step of determining a temperature-rise-based generator current limit of a wind turbine generator set based on the ambient temperature includes: Determine the correction factor of the current limit for the generator temperature rise based on the ambient temperature in different geographical locations; A generator current limit based on temperature rise is calculated based on the ambient temperature, the rated current of the wind turbine generator set, and the correction coefficient.

5. The power control method according to claim 1, wherein: When the key component is a converter, determining the electrical boundary current of the key component of the wind turbine generator based on the ambient temperature includes: Determining the converter current limit value corresponding to the ambient temperature according to the corresponding relationship between the ambient temperature and the converter current limit value; The converter current limit value corresponding to the ambient temperature is determined as the electrical boundary current of the converter. The power control method according to claim 1, wherein: When the key component is a cable, determining the electrical boundary current of the key component of the wind turbine generator based on the ambient temperature includes: Determining the range of the ambient temperature; The current boundary of the cable of the wind turbine generator set is determined based on the range of the ambient temperature.

7. The power control method according to claim 1, wherein: The determining of the stall boundary power of the wind turbine generator set based on the ambient temperature, rotation speed and pitch angle includes: Determining the stall wind speed corresponding to the rotation speed and the pitch angle based on the corresponding relationship among the rotation speed, the pitch angle, and the stall wind speed; Obtaining a wind energy utilization coefficient when the wind turbine generator set is in operation, an air density at the ambient temperature, and an impeller radius of the wind turbine generator set, wherein the air density at the ambient temperature is calculated based on the ambient temperature; The stall boundary power of the wind turbine is calculated based on the stall wind speed, the wind energy utilization coefficient, the air density, and the impeller radius.

8. The power control method according to any one of claims 1 to 7, characterized in that: The step of determining the set power of the wind turbine generator set based on the electrical boundary power and the stall boundary power of the wind turbine generator set includes: Compare the electrical boundary power and stall boundary power of the wind turbine; The minimum value between the electrical boundary power and the stall boundary power is taken as the set power of the wind turbine.

9. The power control method according to any one of claims 1 to 7, characterized in that: Controlling the output of the wind turbine generator set according to the set power includes: If the set power is greater than the rated power, controlling the wind turbine generator set to output in an over-generation state; If the set power is less than the rated power, the wind turbine generator set is controlled to output in a limited power state.

10. The power control method according to any one of claims 1 to 7, characterized in that: After determining the set power of the wind turbine generator set based on the electrical boundary power and the stall boundary power of the wind turbine generator set, the method further includes: The set power is input into a management system as an upper limit of active power of the wind turbine generator set, and the management system is used to perform power dispatch according to grid demand and the upper limit of active power.

11. A power control device for a wind turbine generator system, characterized in that: The power control device comprises: A data acquisition unit is configured to acquire the ambient temperature, rotation speed and pitch angle of the wind turbine when the wind turbine is running; a first power determination unit, configured to determine the electrical boundary power of the wind turbine generator set based on the ambient temperature and the rotational speed; a second power determination unit, configured to determine a stall boundary power of the wind turbine generator based on the ambient temperature, the rotational speed and the pitch angle; a set power determination unit configured to determine the set power of the wind turbine generator based on the electrical boundary power and the stall boundary power of the wind turbine generator; and an output control unit, configured to control the output of the wind turbine generator set according to the set power, The first power determination unit is configured to: Determining electrical boundary currents of key components of the wind turbine generator system based on the ambient temperature, wherein the key components include a generator, a converter, and a cable; Determine the minimum value among the electrical boundary current of the generator, the electrical boundary current of the converter and the electrical boundary current of the cable as the electrical boundary current of the wind turbine generator set; Determine the electrical boundary power of the wind turbine generator set based on the ambient temperature, the rotation speed and the electrical boundary current of the wind turbine generator set; Among them, the electrical boundary power of the wind turbine generator set is calculated based on the rated power of the wind turbine generator set, the electrical boundary current of the wind turbine generator set, the generator winding temperature tested in the laboratory, the ambient temperature, the rated current of the wind turbine generator set, the power loss of the wind turbine generator set, the current speed of the wind turbine generator set, and the rated speed of the wind turbine generator set.

12. The power control device according to claim 11, characterized in that: When the key component is a generator, the electrical boundary current of the generator includes a first current limit value and a second current limit value of the generator; The first current limit refers to the generator current limit based on stability, and the second current limit refers to the generator current limit based on temperature rise. The temperature rise refers to the difference between the temperature of the generator winding and the temperature of the cooling medium in the operating state. The first power determining unit includes a first determining unit configured to: determining a stability-based generator current limit of the wind turbine generator system based on the ambient temperature; A temperature-rise-based generator current limit of the wind turbine is determined based on the ambient temperature.

13. The power control device according to claim 12, characterized in that: The first determining unit is configured to: Obtaining the unstable power of the generator of the wind turbine generator set at the ambient temperature, where the unstable power refers to the load upper limit of the generator; determining a current of the generator at the unstable power based on the unstable power; A current value of the generator at the unstable power is determined as a stability-based generator current limit.

14. The power control device according to claim 12, wherein: The first determining unit is configured to: Determine the correction factor of the current limit for the generator temperature rise based on the ambient temperature in different geographical locations; A generator current limit based on temperature rise is calculated based on the ambient temperature, the rated current of the wind turbine generator set, and the correction coefficient.

15. The power control device according to claim 11, characterized in that: The first power determining unit includes a second determining unit configured to: When the key component is a converter, determining the converter current limit corresponding to the ambient temperature according to a correspondence between the ambient temperature and the converter current limit; The converter current limit value corresponding to the ambient temperature is determined as the electrical boundary current of the converter.

16. The power control device according to claim 11, characterized in that: The first power determining unit includes a third determining unit configured to: When the key component is a cable, determining the range of the ambient temperature; The current boundary of the cable of the wind turbine generator set is determined based on the range of the ambient temperature.

17. The power control device according to claim 11, characterized in that: The second power determination unit is configured to: Determining the stall wind speed corresponding to the rotation speed and the pitch angle based on the corresponding relationship among the rotation speed, the pitch angle, and the stall wind speed; Obtaining a wind energy utilization coefficient when the wind turbine generator set is in operation, an air density at the ambient temperature, and an impeller radius of the wind turbine generator set, wherein the air density at the ambient temperature is calculated based on the ambient temperature; The stall boundary power of the wind turbine is calculated based on the stall wind speed, the wind energy utilization coefficient, the air density, and the impeller radius.

18. The power control device according to any one of claims 11 to 17, characterized in that: The power determination unit is configured to: Compare the electrical boundary power and stall boundary power of the wind turbine; The minimum value between the electrical boundary power and the stall boundary power is taken as the set power of the wind turbine.

19. The power control device according to any one of claims 11 to 17, characterized in that: The output control unit is configured as: If the set power is greater than the rated power, controlling the wind turbine generator set to output in an over-generation state; If the set power is less than the rated power, the wind turbine generator set is controlled to output in a limited power state.

20. The power control device according to any one of claims 11 to 17, characterized in that: The power control device further includes: The data management unit is configured to determine the set power of the wind turbine generator based on the electrical boundary power and stall boundary power of the wind turbine generator, and input the set power as the active power upper limit of the wind turbine generator into the management system, wherein the management system is used to perform power scheduling according to the grid demand and the active power upper limit.

21. A computer-readable storage medium storing computer program instructions, characterized in that: When the computer program instructions are executed by a processor, the power control method for a wind turbine generator system according to any one of claims 1 to 10 is implemented.

22. A computing device, characterized in that The computing device comprises: processor; A memory storing computer program instructions, wherein when the computer program instructions are executed by the processor, the power control method of the wind turbine according to any one of claims 1 to 10 is implemented.

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