CN115839304A - Power control method and device for wind turbine generator - Google Patents
Power control method and device for wind turbine generator Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
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Abstract
A power control method and device for a wind turbine generator are provided. The power control method of the wind turbine generator comprises the following steps: acquiring the ambient temperature, the rotating speed and the pitch angle of the wind turbine generator during operation; determining the electrical boundary power of the wind turbine generator based on the ambient temperature and the rotating speed; determining stall boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the pitch angle; 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; and controlling the output of the wind turbine generator according to the set power.
Description
Technical Field
The present disclosure relates to the field of wind power generation technology. More specifically, the present disclosure relates to a power control method and apparatus for a wind turbine.
Background
According to wind power market research and unit economy evaluation, basic operation parameters of a unit, such as power, rotating speed, torque and the like, can be preliminarily determined in a complete machine development stage, and then type selection determination and structural design can be performed on relevant hardware equipment of the unit according to the operation parameters of the unit and relevant standard requirements, so that safe operation of the unit is ensured. In the development of the whole machine, hardware equipment and structures are generally designed according to standard environmental parameters or ranges so as to meet the unit operation requirements and the cost requirements, so that the hardware equipment or the structures of the unit have a strict and definite operation boundary. However, since the performance of hardware devices or structures may change due to the influence of the actual environment, the unit power boundary also changes.
Disclosure of Invention
An exemplary embodiment of the present disclosure provides a power control method and device for a wind turbine generator, so as to adjust a set power of the wind turbine generator according to an actual ambient temperature, increase a power generation amount when the temperature is low, and ensure safety of the wind turbine generator when the temperature is high, thereby increasing competitiveness of the wind turbine generator.
According to an exemplary embodiment of the present disclosure, there is provided a power control method of a wind turbine, including: acquiring the ambient temperature, the rotating speed and the pitch angle of a wind turbine generator during operation; determining the electrical boundary power of the wind turbine generator based on the ambient temperature and the rotating speed; determining stall boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the pitch angle; 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; and controlling the output of the wind turbine generator according to the set power.
Optionally, the determining the electrical boundary power of the wind turbine based on the ambient temperature and the rotation speed may include: determining electrical boundary currents of key components of the wind turbine based on the ambient temperature, wherein the key components comprise 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 set; and determining the electrical boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the electrical boundary current of the wind turbine generator.
Optionally, the determining the electrical boundary power of the wind turbine based on the ambient temperature, the rotation speed and the electrical boundary current of the wind turbine may include: acquiring rated power, rated current and loss power of the wind turbine generator; and calculating the electrical boundary power of the wind turbine generator based on the rated power, the rated current, the loss power and the temperature of the generator winding of the wind turbine generator, the electrical boundary current, the rotating speed and the environment temperature.
Optionally, when the critical 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, where the first current limit is a stability-based generator current limit, and the second current limit is a temperature-rise-based generator current limit, and the temperature rise is a difference between a temperature of a generator winding and a temperature of a cooling medium in an operating state, where determining the electrical boundary current of the critical component of the wind turbine generator based on the ambient temperature may include: determining a stability-based generator current limit for the wind turbine based on the ambient temperature; determining a temperature rise-based generator current limit for the wind turbine based on the ambient temperature.
Optionally, the determining a stability-based generator current limit for the wind turbine based on the ambient temperature may include: acquiring instability power of a generator of the wind turbine generator at the ambient temperature, wherein the instability power refers to the upper load limit of the generator; determining a current of the generator at the destabilized power based on the destabilized power; determining a current value of the generator at the destabilized power as a stability-based generator current limit.
Optionally, the determining a temperature rise-based generator current limit value of the wind turbine based on the ambient temperature may include: determining a correction coefficient of a current limit value of the temperature rise of the generator according to the environmental temperatures of different geographical positions; and calculating a temperature rise-based generator current limit value based on the ambient temperature, the rated current of the wind turbine generator and the correction coefficient.
Optionally, when the critical component is a converter, the determining an electrical boundary current of the critical component of the wind turbine based on the ambient temperature may include: determining a current limit value of a converter corresponding to the environment temperature according to the corresponding relation between the environment temperature and the current limit value of the converter; and determining the current limit value of the converter corresponding to the environment temperature as the electrical boundary current of the converter.
Optionally, when the critical component is a cable, the determining an electrical boundary current of the critical component of the wind turbine based on the ambient temperature may include: determining a range within which the ambient temperature is located; and determining the current boundary of the cable of the wind turbine generator based on the range of the ambient temperature.
Optionally, the determining the stall boundary power of the wind turbine generator based on the ambient temperature, the rotation speed and the pitch angle may include: determining stall wind speed corresponding to the rotating speed and the pitch angle based on the corresponding relation of the rotating speed, the pitch angle and the stall wind speed; acquiring a wind energy utilization coefficient when the wind turbine generator runs, air density at the ambient temperature and the radius of an impeller of the wind turbine generator, wherein the air density at the ambient temperature is calculated based on the ambient temperature; calculating a stall boundary power for the wind turbine based on the stall wind speed, the wind energy utilization factor, the air density, and the impeller radius.
Optionally, the 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 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.
Optionally, controlling the output of the wind turbine according to the set power may include: if the set power is larger than the rated power, controlling the wind turbine generator to output in an over-running state; and if the set power is smaller than the rated power, controlling the wind turbine generator to output in a power limiting state.
Optionally, 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, the method may further include: and inputting the set power as the upper limit of the active power of the wind turbine generator into a management system, wherein the management system is used for carrying out power scheduling according to the power grid requirement and the upper limit of the active power.
According to an exemplary embodiment of the present disclosure, there is provided a power control apparatus of a wind turbine, including: the data acquisition unit is configured to acquire the ambient temperature, the rotating speed and the pitch angle when the wind turbine generator runs; a first power determination unit configured to determine an electrical boundary power of the wind turbine 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 based on the ambient temperature, the rotational speed and the 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 an output of the wind turbine generator according to the set power.
Optionally, the first power determination unit may be configured to: determining electrical boundary currents of key components of the wind turbine based on the ambient temperature, wherein the key components comprise 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 set; and determining the electrical boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the electrical boundary current of the wind turbine generator.
Optionally, the first power determination unit may be configured to: acquiring rated power, rated current and loss power of the wind turbine generator; calculating the electrical boundary power of the wind turbine based on the rated power, the rated current, the loss power of the wind turbine, the temperature of the generator winding, the electrical boundary current, the rotating speed and the environment temperature.
Optionally, when the critical component is a generator, the electrical boundary current of the generator may comprise a first current limit and a second current limit of the generator, wherein the first current limit is a stability-based generator current limit, and the second current limit is a temperature rise-based generator current limit, and the temperature rise is a difference between a temperature of the generator winding and a temperature of the cooling medium in the operating state, wherein the first power determining unit may comprise a first determining unit configured to: determining a stability-based generator current limit for the wind turbine based on the ambient temperature; determining a temperature rise-based generator current limit for the wind turbine based on the ambient temperature.
Alternatively, the first determination unit may be configured to: acquiring instability power of a generator of the wind turbine generator at the ambient temperature, wherein the instability power refers to the upper load limit of the generator; determining a current of the generator at the destabilized power based on the destabilized power; determining a current value of the generator at the destabilized power as a stability-based generator current limit.
Alternatively, the first determination unit may be configured to: determining a correction coefficient of a current limit value of the temperature rise of the generator according to the environmental temperatures of different geographical positions; and calculating a temperature rise-based generator current limit value based on the ambient temperature, the rated current of the wind turbine generator and the correction coefficient.
Optionally, the first power determining unit may include a second determining unit configured to: when the key component is a converter, determining a converter current limit value corresponding to the environment temperature according to the corresponding relation between the environment temperature and the converter current limit value; and determining the current limit value of the converter corresponding to the environment temperature as the electrical boundary current of the converter.
Optionally, the first power determining unit may include a third determining unit configured to: when the key component is a cable, determining the range of the environment temperature; and determining the current boundary of the cable of the wind turbine generator based on the range of the ambient temperature.
Optionally, the second power determination unit may be configured to: determining stall wind speed corresponding to the rotating speed and the pitch angle based on the corresponding relation of the rotating speed, the pitch angle and the stall wind speed; acquiring a wind energy utilization coefficient when the wind turbine generator operates, air density at the ambient temperature and the radius of an impeller of the wind turbine generator, wherein the air density at the ambient temperature is calculated based on the ambient temperature; calculating a stall boundary power for the wind turbine based on the stall wind speed, the wind energy utilization factor, the air density, and the impeller radius.
Alternatively, the set power determining unit may be configured to: 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.
Alternatively, the output control unit may be configured to: if the set power is larger than the rated power, controlling the wind turbine generator to output in an over-running state; and if the set power is smaller than the rated power, controlling the wind turbine generator to output in a power limiting state.
Optionally, the power control apparatus may further include: the data management unit is configured to input set power of the wind turbine generator set as an upper limit of active power of the wind turbine generator set to a management system after the set power is determined based on the electrical boundary power and the stall boundary power of the wind turbine generator set, and the management system is used for carrying out power scheduling according to power grid requirements and the upper limit of the active power.
According to an exemplary embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored, which, when executed by a processor, implement a power control method of a wind turbine according to an exemplary embodiment of the present disclosure.
According to an exemplary embodiment of the present disclosure, there is provided a computing apparatus including: at least one processor; at least one memory storing computer program instructions that, when executed by the at least one processor, implement a method of power control for a wind turbine according to an exemplary embodiment of the present disclosure.
According to an exemplary embodiment of the present disclosure, a computer program product is provided, in which instructions are executable by a processor of a computer device to perform a method of power control of a wind turbine according to an exemplary embodiment of the present disclosure.
According to the power control method and device of the wind turbine generator, the environmental temperature, the rotating speed and the pitch angle of the wind turbine generator during operation are obtained, the electrical boundary power of the wind turbine generator is determined based on the environmental temperature and the rotating speed, the stall boundary power of the wind turbine generator is determined based on the environmental temperature, the rotating speed and the pitch angle, 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, the output of the wind turbine generator is controlled according to the set power, the set power of the wind turbine generator is adjusted according to the actual environmental temperature, the generated energy is improved when the temperature is low, the safety of the wind turbine generator is ensured when the temperature is high, and therefore the competitiveness of the wind turbine generator is improved.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The above and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:
FIG. 1A shows a flow chart of a method of power control of a wind turbine according to an exemplary embodiment of the present disclosure;
FIG. 1B illustrates a logic diagram for power control of a wind turbine according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates a block diagram of a power control apparatus of a wind turbine according to an exemplary embodiment of the present disclosure;
fig. 3 shows a block diagram of a first power determination unit according to an exemplary embodiment of the present disclosure;
FIG. 4 shows a block diagram of a power control arrangement of a wind turbine according to another exemplary embodiment of the present disclosure; and
fig. 5 shows a schematic diagram of a computing device according to an example embodiment of the present disclosure.
Detailed Description
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 the like elements throughout. The embodiments are described below in order to explain the present disclosure by referring to the figures.
Fig. 1A illustrates a flow chart of a method of power control of a wind turbine according to an exemplary embodiment of the present disclosure. FIG. 1B illustrates a logic diagram for power control of a wind turbine according to an exemplary embodiment of the present disclosure.
Referring to fig. 1, in step S101, an ambient temperature, a rotation speed, and a pitch angle of the wind turbine during operation are acquired.
In an exemplary embodiment of the present disclosure, the ambient temperature may be acquired by an ambient temperature sensor installed outside the nacelle of the wind turbine. Specifically, according to different configurations of wind turbines, there are two situations: one is provided with one set of ambient temperature sensor, and the other is provided with two sets of ambient temperature sensors. When the sensor and the temperature data are not abnormal, the temperature data is used for calculating the electric boundary power, otherwise, the calculation output is not carried out; when the default sensor and the temperature data are judged to be abnormal, the temperature data is used for calculating the electrical boundary power, otherwise, when the standby sensor and the temperature data are judged to be abnormal, the temperature data is used for calculating the electrical boundary power, and otherwise, the calculation output is not carried out.
In step S102, the electrical boundary power of the wind turbine is determined based on the ambient temperature and the rotational speed.
In an exemplary embodiment of the present disclosure, when determining the electrical boundary power of the wind turbine based on the ambient temperature and the rotational speed, the electrical boundary current of the critical component of the wind turbine may be first determined based on the ambient temperature, where the critical component may include at least one of a generator, a converter, a cable. The minimum of the electrical boundary currents of the critical components is then determined as the electrical boundary current of the wind turbine, and the electrical boundary power of the wind turbine is determined on the basis of the ambient temperature, the rotational speed and the electrical boundary current of the wind turbine. For example, when the generator, the converter, and the cable are all determined as the key components, 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 may be determined as the electrical boundary current of the wind turbine group.
That is, the current tolerance is an important factor affecting the electrical power margin of the wind turbine. For example, the current bearing capacity of the generator is mainly influenced by the altitude and the ambient temperature under the condition of the type selection determination, and the higher the altitude and the ambient temperature are, the smaller the current can be borne, and the lower the settable power is; the bearing capacity of the current of the converter is mainly influenced by the ambient temperature under the condition of type selection determination, and the higher the temperature is, the smaller the borne current is, and the lower the settable power is; the bearing capacity of the cable current is mainly influenced by the ambient temperature under the condition of the selected type, and the higher the ambient temperature is, the smaller the current can be borne, and the lower the settable power is.
In an exemplary embodiment of the present disclosure, when determining 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, the rated power, the rated current, and the loss power of the wind turbine may be first obtained, and then the electrical boundary power of the wind turbine may be calculated based on the rated power, the rated current, the loss power, the generator winding temperature, and the electrical boundary current, the rotational speed, and the ambient temperature of the wind turbine.
For example, the electrical boundary power of a wind turbine may be calculated according to the following formula.
Here, pwr \ u Elec Representing electrical boundary power, P rate Indicating the rated power of the wind turbine elec Representing the electrical boundary current, T test Represents the generator winding temperature of the laboratory test, t represents the ambient temperature, I rate The rated current of the wind turbine is represented, pwr _ Loss represents the Loss power of the wind turbine, omega represents the current rotating speed of the wind turbine, and omega rate represents the rated rotating speed of the wind turbine.That is, the electrical boundary power at different temperatures t is proportional to the power calculated from the electrical current boundary minus the unit power loss.
In an exemplary embodiment of the present disclosure, when the critical component is a generator, the electrical boundary current of the generator includes a first current limit and a second current limit of the generator. Here, the first current limit is a generator current limit based on stability, the second current limit is a generator current limit based on a temperature rise, which is the difference between the temperature of the generator winding and the temperature of the cooling medium in the operating state. That is, when calculating the generator current boundary, the current boundary to be considered mainly includes a limit value of temperature rise to the generator current and a limit value of stability to the generator current.
In an exemplary embodiment of the present disclosure, when determining electrical boundary currents of critical components of a wind turbine based on ambient temperature, a stability-based generator current limit for the wind turbine may be determined based on ambient temperature first, and then a temperature rise-based generator current limit for the wind turbine may be determined based on ambient temperature.
In an exemplary embodiment of the present disclosure, when determining the stability-based generator current limit value of the wind turbine based on the ambient temperature, the instability power of the generator of the wind turbine at the ambient temperature may be first obtained, the current of the generator at the instability power may be determined based on the instability power, and then the current value of the generator at the instability power may be determined as the stability-based generator current limit value. Here, the destabilized power refers to an upper load limit of the generator.
The load of the generator has an upper limit, which is called the destabilized power, above which the generator risks to destabilize. The instability power of the motor is different under different environmental temperatures, and the instability power and the temperature form a positive correlation relationship.
For example, according to formula I unstability ＝((1-T test *0.0011)*I rate )/(P rate *(P test /(1-T unstability *0.0011 ) calculating the current of the generator at the power of the instability. Here, I unstability Representing the current of the generator at destabilized power, T test Indicating the temperature of the generator winding, I rate Indicating rated current, P, of wind turbine rate Indicating rated power, P, of the wind turbine test Indicating the destabilizing power, T unstability Indicating a destabilizing temperature.
In an exemplary embodiment of the disclosure, when determining the temperature rise-based generator current limit of the wind turbine based on the ambient temperature, a correction coefficient of the current limit of the temperature rise of the generator may be first determined according to the ambient temperatures of different geographic locations, and then the temperature rise-based generator current limit may be calculated based on the ambient temperature, the rated current of the wind turbine, and the correction coefficient.
The temperature rise is the difference between the temperature of the winding and the temperature of the cooling medium when the generator operates under a certain condition, the difference is limited by an upper limit according to the design grade, and the corresponding temperature rise value under different currents is a temperature rise curve. Therefore, in order to meet the requirement of temperature rise, the current must be in a certain range, and the temperature rise is also influenced by the altitude and the ambient temperature, so that the temperature rise measured under different altitudes and ambient temperatures is different and needs to be corrected to a certain extent, so that certain correction needs to be performed according to different altitudes and temperatures when the current range meeting the requirement of temperature rise is calculated, and an example of the corresponding relation between the correction coefficient and the altitude and the temperature provided after the test of an electrical professional team is shown in table 1.
TABLE 1 Generator temperature rise Current Limit correction factor
As shown in table 1, the altitude is divided into 4 gears, and the altitude closest to the actual altitude (referred to as equivalent altitude ASL) is used to find the correction coefficient. Therefore, when calculating the correction value K, the equivalent altitude ASL and the column position L (L = 1/2/3/4) thereof are determined, and then the correction value K is calculated by linear interpolation according to the temperature.
For example, it can be based on a formula
And calculating a correction coefficient of the temperature rise current limit value of the generator. Here, K represents the correction factor of the generator temperature rise current limit, K 1L Represents T 1 Correction factor for temperature rise current limit of generator at temperature, K 2L Represents T 2 Correction coefficient of temperature rise current limit value of generator under temperature, T represents ambient temperature, T 1 Correction coefficient K for representing and limiting value of generator temperature rise current 1L Corresponding temperature, T 2 Correction coefficient K for representing and generating machine temperature rise current limit value 2L The corresponding temperature. Then, can be according to the formula->
A temperature rise based generator current limit is calculated. Here, I TempUp Representing generator current limit, T, based on temperature rise test Representing the generator winding temperature, t representing the ambient temperature, I rate And K represents the rated current of the wind turbine generator, and represents a correction coefficient.
In an exemplary embodiment of the disclosure, when the critical component is a converter, when determining the electrical boundary current of the critical component of the wind turbine generator based on the ambient temperature, the converter current limit value corresponding to the ambient temperature may be first determined according to the corresponding relationship between the ambient temperature and the converter current limit value, and then the converter current limit value corresponding to the ambient temperature may be determined as the electrical boundary current of the converter.
For example, when the ambient temperature is in a first range (e.g., t)<= T3), determining the current boundary of the converter of the wind turbine as the first current limit value I of the converter 3 . When the ambient temperature is in a second range (e.g., T3 < T < = T4), the formula may be followed
And calculating the current boundary of a converter of the wind turbine generator. Here, I cnv Indicating the current boundary of the converter of the wind turbine 3 Representing a first current limit, I, of the converter 4 Representing a second current limit of the converter, T representing the ambient temperature, T 3 Denotes the upper temperature, T, of the first range 4 Indicating the upper temperature of the second range.
In an exemplary embodiment of the present disclosure, when the critical component is a cable, when determining the electrical boundary current of the critical component of the wind turbine based on the ambient temperature, a range in which the ambient temperature is located may be first determined, and then the current boundary of the cable of the wind turbine may be determined based on the range in which the ambient temperature is located.
For example, when the ambient temperature is in a third range (e.g., T < = T5), the current boundary of the cable of the wind turbine is determined to be a third current limit value I 5 . When the ambient temperature is in a fourth range (e.g., T5 < T < = T6), the formula may be followed
And calculating the current boundary of the cable of the wind turbine generator. Here, I cab Indicating the current boundary of the cable of the wind turbine 5 Denotes the third current limit, I 6 Representing the fourth current limit, T representing the ambient temperature, T 5 Denotes the upper limit temperature, T, of the third range 6 The upper temperature of the fourth range is indicated. When the ambient temperature is in a fifth range (e.g., T > T6), it may be based on the formula->
Calculating the current boundary of the cable of the wind turbine, wherein I cab Indicating the current boundary of the cable of the wind turbine 6 Denotes the fourth current limit, I 7 Represents the fifth current limit, T represents the ambient temperature, T 6 Denotes the upper limit temperature, T, of the fourth range 7 The upper limit temperature of the fifth range is indicated.
In step S103, a stall boundary power of the wind turbine is determined based on the ambient temperature, the rotational speed and the pitch angle.
In an exemplary embodiment of the present disclosure, when determining the stall boundary power of the wind turbine generator based on the ambient temperature, the rotational speed, and the pitch angle, the stall wind speed corresponding to the rotational speed and the pitch angle may be first determined based on a corresponding relationship between the rotational speed, the pitch angle, and the stall wind speed, and the wind energy utilization coefficient, the air density at the ambient temperature, and the impeller radius of the wind turbine generator when the wind turbine generator operates are obtained, and then the stall boundary power of the wind turbine generator is calculated based on the stall wind speed, the wind energy utilization coefficient, the air density, and the impeller radius. Here, the air density at the ambient temperature is calculated based on the ambient temperature.
When the stall wind speed corresponding to the rotating speed and the pitch angle is determined based on the corresponding relation of the rotating speed, the pitch angle and the stall wind speed, because the stall wind speed and the rotating speed and the pitch angle are in a linear relation, curve fitting can be firstly carried out in order to avoid excessive parameters, and then the stall wind speed is calculated in real time according to the fitting relation of the stall wind speed and the rotating speed and the pitch angle.
The wind energy utilization coefficient Cp of the unit during operation can be obtained by looking up a table according to the real-time pitch angle and the blade tip speed ratio, wherein the horizontal axis of the table is the pitch angle (PitAng), the vertical axis of the table is the blade tip speed ratio (Lamda), and the middle of the table corresponds to Cp/(Lamda) 3 。
Since air density is affected by altitude and temperature, it is necessary to calculate air density from the actual altitude at the site, as well as the temperature in real time.
For example, according to a formula
The air density is calculated. 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 formula Pwr can be used stall ＝0.5*ρ*PI*Cp*R 2 *WindSpd_Stall 3 And calculating the stalling boundary power of the wind turbine generator. Here, pwr stall The Stall boundary power of the wind turbine is represented, rho represents the air density, PI represents the circumferential rate, cp represents the wind energy utilization coefficient, R represents the impeller radius, and WindSpd _ Stall represents the Stall wind speed.
In step S104, the set power of the wind turbine is determined based on the electrical boundary power and the stall boundary power of the wind turbine.
In an exemplary embodiment of the present disclosure, when determining the set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine, the electrical boundary power and the stall boundary power of the wind turbine may be first compared, and then the minimum value of the electrical boundary power and the stall boundary power may be used as the set power of the wind turbine.
In step S105, the output of the wind turbine is controlled according to the set power.
In an exemplary embodiment of the present disclosure, when controlling the output of the wind turbine according to the set power, if the set power is greater than the rated power, controlling the wind turbine to output in an overgrid state; and if the set power is smaller than the rated power, controlling the wind turbine generator to output in a power limiting state.
In an exemplary embodiment of the present disclosure, as shown in fig. 1B, after determining the set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine, the set power may also be input to a management system (energy management platform) as an upper limit of the active power of the wind turbine. Here, the management system is used for performing power scheduling according to the grid demand and the upper limit of the active power. For example, the management system may set the power setting for an overshoot to not exceed 1.05 times the original rated power.
Further, according to an exemplary embodiment of the present disclosure, there is also provided a computer readable storage medium having stored thereon computer program instructions which, when executed, implement a power control method of a wind turbine according to an exemplary embodiment of the present disclosure.
In exemplary embodiments of the disclosure, the computer readable storage medium may carry one or more programs which, when executed, implement the steps of: acquiring the ambient temperature, the rotating speed and the pitch angle of a wind turbine generator during operation; determining the electrical boundary power of the wind turbine generator based on the ambient temperature; determining stall boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the pitch angle; 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; and controlling the output of the wind turbine generator according to the set power.
A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In embodiments of the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer program embodied on the computer readable storage medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing. The computer readable storage medium may be embodied in any device; it may also be present separately and not assembled into the device.
Furthermore, according to an exemplary embodiment of the present disclosure, a computer program product is also provided, in which instructions are executable by a processor of a computer device to perform a method of power control of a wind power plant according to an exemplary embodiment of the present disclosure.
The power control method of the wind turbine generator according to the exemplary embodiment of the present disclosure has been described above with reference to fig. 1A and 1B. Hereinafter, a power control apparatus of a wind turbine generator and units thereof according to an exemplary embodiment of the present disclosure will be described with reference to fig. 2 to 4.
Fig. 2 shows a block diagram of a power control arrangement of a wind turbine according to an exemplary embodiment of the present disclosure. Fig. 3 illustrates a block diagram of a first power determination unit according to an exemplary embodiment of the present disclosure. Fig. 4 shows a block diagram of a power control arrangement of a wind turbine according to another exemplary embodiment of the present disclosure.
Referring to fig. 2, the power control apparatus of the wind turbine 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.
The data acquisition unit 21 is configured to acquire the ambient temperature, the rotational speed, and the pitch angle at which the wind turbine generator operates.
The first power determination unit 22 is configured to determine the electrical boundary power of the wind turbine based on the ambient temperature and the rotational speed.
In an exemplary embodiment of the present disclosure, the first power determining unit 22 may be configured to: determining 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, a cable; determining the minimum value in the electrical boundary currents of the key components as the electrical boundary current of the wind turbine generator set; the electrical boundary power of the wind turbine is determined based on the ambient temperature, the rotational speed and the electrical boundary current of the wind turbine. When 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 can be determined as the electrical boundary current of the wind turbine group.
In an exemplary embodiment of the present disclosure, the first power determining unit 22 may be configured to: acquiring rated power, rated current and loss power of the wind turbine generator; and calculating the electrical boundary power of the wind turbine generator based on the rated power, the rated current, the loss power, the temperature of the generator winding, the electrical boundary current, the rotating speed and the ambient temperature of the wind turbine generator.
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 is a stability-based generator current limit, the second current limit is a temperature rise-based generator current limit, and the temperature rise is a difference between a temperature of the generator winding and a temperature of the cooling medium in the operating state.
In an exemplary embodiment of the present disclosure, the first power determining unit 22 may include at least one of the first determining unit 221, the second determining unit 222, and the third determining unit 223. Fig. 3 shows an example in which the first power determining unit 22 includes a first determining unit 221, a second determining unit 222, and a third determining unit 223.
In an exemplary embodiment of the present disclosure, the first determination unit 221 may be configured to determine a stability-based generator current limit for the wind turbine based on the ambient temperature; a temperature rise-based generator current limit for the wind turbine is determined based on the ambient temperature.
In an exemplary embodiment of the present disclosure, the first determination unit 221 may be configured to: acquiring instability power of a generator of a wind turbine generator at an ambient temperature, wherein the instability power refers to the upper limit of the load of the generator; determining the current of the generator under the instability power based on the instability power; the current value of the generator at the destabilized power is determined as the stability-based generator current limit.
In an exemplary embodiment of the present disclosure, the first determination unit 221 may be configured to: determining a correction coefficient of a current limit value of the temperature rise of the generator according to the environmental temperatures of different geographical positions; and calculating the temperature rise-based generator current limit value based on the ambient temperature, the rated current of the wind turbine generator and the correction coefficient.
In an exemplary embodiment of the present disclosure, the second determining unit 222 may be configured to: when the key component is a converter, determining a converter current limit value corresponding to the environment temperature according to the corresponding relation between the environment temperature and the converter current limit value; and determining the current limit value of the converter corresponding to the ambient temperature as the electrical boundary current of the converter.
In an exemplary embodiment of the present disclosure, the third determining unit 223 may be 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 is determined based on the range in which the ambient temperature is located.
The second power determination unit 23 is configured to determine the stall boundary power of the wind turbine based on the ambient temperature, the rotational speed and the pitch angle.
In an exemplary embodiment of the present disclosure, the second power determining unit 23 may be configured to: determining stall wind speed corresponding to the rotating speed and the pitch angle based on the corresponding relation of the rotating speed, the pitch angle and the stall wind speed; acquiring a wind energy utilization coefficient when the wind turbine generator runs, air density at ambient temperature and the radius of an impeller of the wind turbine generator, 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.
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.
In an exemplary embodiment of the present disclosure, the set power determining unit 24 may be configured to: 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.
The output control unit 25 is configured to control the output of the wind turbine generator according to the set power.
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, controlling the wind turbine generator to output in an overgeneration state; and if the set power is smaller than the rated power, controlling the wind turbine generator to output in a power limiting state.
In an exemplary embodiment of the present disclosure, as shown in fig. 4, the power control apparatus may further include, 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 data management unit 26 is configured to, after determining the set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine, input the set power as an upper active power limit of the wind turbine to a management system, the management system being configured to perform power scheduling according to the grid demand and the upper active power limit.
The power control apparatus of a wind turbine generator according to an exemplary embodiment of the present disclosure has been described above with reference to fig. 2 to 4. Next, a computing device according to an exemplary embodiment of the present disclosure is described with reference to fig. 5.
Fig. 5 shows a schematic diagram of a computing device according to an example embodiment of the present disclosure.
Referring to fig. 5, the computing device 5 according to an exemplary embodiment of the present disclosure includes a memory 51 and a processor 52, the memory 51 having stored thereon computer program instructions that, when executed by the processor 52, implement a power control method of a wind turbine according to an exemplary embodiment of the present disclosure.
In an exemplary embodiment of the disclosure, the computer program instructions, when executed by the processor 52, may implement the steps of: acquiring the ambient temperature, the rotating speed and the pitch angle of the wind turbine generator during operation; determining the electrical boundary power of the wind turbine generator based on the ambient temperature and the rotating speed; determining stall boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the pitch angle; 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; and controlling the output of the wind turbine generator according to the set power.
The computing device illustrated in fig. 5 is only one example and should not impose any limitations on the functionality or scope of use of embodiments of the disclosure.
The power control method and apparatus of the wind turbine generator according to the exemplary embodiment of the present disclosure have been described above with reference to fig. 1 to 5. However, it should be understood that: the power control apparatus of the wind turbine shown in fig. 2 to 4 and units thereof may be respectively configured as software, hardware, firmware, or any combination thereof to perform a specific function, the computing apparatus shown in fig. 5 is not limited to include the above-illustrated components, but some components may be added or deleted as needed, and the above components may also be combined.
According to the power control method and device of the wind turbine generator, the environmental temperature, the rotating speed and the pitch angle of the wind turbine generator during operation are obtained, the electrical boundary power of the wind turbine generator is determined based on the environmental temperature and the rotating speed, the stall boundary power of the wind turbine generator is determined based on the environmental temperature, the rotating speed and the pitch angle, 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, the output of the wind turbine generator is controlled according to the set power, the power setting of the wind turbine generator is adjusted according to the actual environmental temperature, the power generation amount is improved when the temperature is low, the safety of the wind turbine generator is ensured when the temperature is high, and therefore the competitiveness of the wind turbine generator is improved.
While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill 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 (26)
1. A power control method of a wind turbine generator is characterized by comprising the following steps:
acquiring the ambient temperature, the rotating speed and the pitch angle of the wind turbine generator during operation;
determining the electrical boundary power of the wind turbine generator based on the ambient temperature and the rotating speed;
determining stall boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the pitch angle;
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;
and controlling the output of the wind turbine generator according to the set power.
2. The power control method of claim 1, wherein determining the electrical boundary power of the wind turbine based on the ambient temperature and the rotational speed comprises:
determining electrical boundary currents of key components of the wind turbine based on the ambient temperature, wherein the key components comprise 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 set;
and determining the electrical boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the electrical boundary current of the wind turbine generator.
3. The power control method of claim 2, wherein determining 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 comprises:
acquiring rated power, rated current and loss power of a wind turbine generator;
calculating the electrical boundary power of the wind turbine based on the rated power, the rated current, the loss power of the wind turbine, the temperature of the generator winding, the electrical boundary current, the rotating speed and the environment temperature.
4. The power control method of claim 2, wherein when the critical component is a generator, the electrical boundary current of the generator comprises a first current limit and a second current limit of the generator,
wherein the first current limit is a stability-based generator current limit, the second current limit is a temperature rise-based generator current limit, the temperature rise is a difference between a temperature of a generator winding and a temperature of a cooling medium in an operating state,
wherein the determining electrical boundary currents of key components of the wind turbine based on the ambient temperature comprises:
determining a stability-based generator current limit for the wind turbine based on the ambient temperature;
determining a temperature rise-based generator current limit for the wind turbine based on the ambient temperature.
5. The power control method of claim 4, wherein determining a stability-based generator current limit for a wind turbine based on the ambient temperature comprises:
acquiring instability power of a generator of the wind turbine generator at the ambient temperature, wherein the instability power refers to the upper load limit of the generator;
determining a current of the generator at the destabilized power based on the destabilized power;
determining a current value of the generator at the destabilized power as a stability-based generator current limit.
6. The power control method of claim 4, wherein determining a temperature rise-based generator current limit for the wind turbine based on the ambient temperature comprises:
determining a correction coefficient of a current limit value of the temperature rise of the generator according to the environmental temperatures of different geographical positions;
and calculating a generator current limit value based on temperature rise based on the environment temperature, the rated current of the wind turbine generator and the correction coefficient.
7. The power control method of claim 2, wherein when the critical component is a converter, the determining an electrical boundary current of the critical component of the wind turbine based on the ambient temperature comprises:
determining a current limit value of a converter corresponding to the environment temperature according to the corresponding relation between the environment temperature and the current limit value of the converter;
and determining the current limit value of the converter corresponding to the environment temperature as the electrical boundary current of the converter.
8. The power control method of claim 2, wherein when the critical component is a cable, the determining an electrical boundary current of the critical component of the wind turbine based on the ambient temperature comprises:
determining a range within which the ambient temperature is located;
and determining the current boundary of the cable of the wind turbine generator based on the range of the ambient temperature.
9. The power control method of claim 1, wherein determining a stall boundary power for a wind turbine based on the ambient temperature, the rotational speed, and the pitch angle comprises:
determining stall wind speed corresponding to the rotating speed and the pitch angle based on the corresponding relation of the rotating speed, the pitch angle and the stall wind speed;
acquiring a wind energy utilization coefficient when the wind turbine generator runs, air density at the ambient temperature and the radius of an impeller of the wind turbine generator, wherein the air density at the ambient temperature is calculated based on the ambient temperature;
calculating a stall boundary power for the wind turbine based on the stall wind speed, the wind energy utilization factor, the air density, and the impeller radius.
10. The power control method according to any one of claims 1 to 9, wherein determining the set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine comprises:
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.
11. The power control method according to any one of claims 1 to 9, wherein controlling the output of the wind turbine according to the set power includes:
if the set power is larger than the rated power, controlling the wind turbine generator to output in an overgeneration state;
and if the set power is smaller than the rated power, controlling the wind turbine generator to output in a power limiting state.
12. The power control method according to any one of claims 1 to 9, wherein after determining the set power of the wind turbine based on the electrical boundary power and the stall boundary power of the wind turbine, further comprising:
and inputting the set power as the upper limit of the active power of the wind turbine generator into a management system, wherein the management system is used for carrying out power scheduling according to the power grid requirement and the upper limit of the active power.
13. A power control apparatus of a wind turbine generator, characterized in that the power control apparatus comprises:
the data acquisition unit is configured to acquire the ambient temperature, the rotating speed and the pitch angle when the wind turbine generator runs;
a first power determination unit configured to determine an electrical boundary power of the wind turbine 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 based on the ambient temperature, the rotational speed and the pitch angle;
a set power determination unit configured to determine set power of the wind turbines based on electrical boundary power and stall boundary power of the wind turbines; and
an output control unit configured to control an output of the wind turbine generator according to the set power.
14. The power control apparatus of claim 13, wherein the first power determining unit is configured to:
determining electrical boundary currents of key components of the wind turbine based on the ambient temperature, wherein the key components comprise 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 set;
and determining the electrical boundary power of the wind turbine generator based on the ambient temperature, the rotating speed and the electrical boundary current of the wind turbine generator.
15. The power control apparatus of claim 14, wherein the first power determining unit is configured to:
acquiring rated power, rated current and loss power of the wind turbine generator;
calculating the electrical boundary power of the wind turbine based on the rated power, the rated current, the loss power of the wind turbine, the temperature of the generator winding, the electrical boundary current, the rotating speed and the environment temperature.
16. The power control apparatus of claim 14, wherein when the critical component is a generator, the electrical boundary current of the generator comprises a first current limit and a second current limit of the generator;
wherein the first current limit is a stability-based generator current limit, the second current limit is a temperature rise-based generator current limit, the temperature rise is a difference between a temperature of a generator winding and a temperature of a cooling medium in an operating state,
wherein the first power determination unit comprises a first determination unit configured to:
determining a stability-based generator current limit for the wind turbine based on the ambient temperature;
and determining a temperature rise-based generator current limit value of the wind turbine generator based on the ambient temperature.
17. The power control apparatus of claim 16, wherein the first determining unit is configured to:
acquiring instability power of a generator of the wind turbine generator at the ambient temperature, wherein the instability power refers to the upper load limit of the generator;
determining a current of the generator at the destabilized power based on the destabilized power;
determining a current value of the generator at the destabilized power as a stability-based generator current limit.
18. The power control apparatus of claim 16, wherein the first determining unit is configured to:
determining a correction coefficient of a current limit value of the temperature rise of the generator according to the environmental temperatures of different geographical positions;
and calculating a temperature rise-based generator current limit value based on the ambient temperature, the rated current of the wind turbine generator and the correction coefficient.
19. The power control apparatus of claim 14, wherein the first power determining unit comprises a second determining unit configured to:
when the key component is a converter, determining a converter current limit value corresponding to the environment temperature according to the corresponding relation between the environment temperature and the converter current limit value;
and determining the current limit value of the converter corresponding to the environment temperature as the electrical boundary current of the converter.
20. The power control apparatus of claim 14, wherein the first power determining unit comprises a third determining unit configured to:
when the key component is a cable, determining the range of the environment temperature;
and determining the current boundary of the cable of the wind turbine generator based on the range of the ambient temperature.
21. The power control apparatus of claim 13, wherein the second power determining unit is configured to:
determining stall wind speed corresponding to the rotating speed and the pitch angle based on the corresponding relation of the rotating speed, the pitch angle and the stall wind speed;
acquiring a wind energy utilization coefficient when the wind turbine generator runs, air density at the ambient temperature and the radius of an impeller of the wind turbine generator, wherein the air density at the ambient temperature is calculated based on the ambient temperature;
calculating a stall boundary power for the wind turbine based on the stall wind speed, the wind energy utilization factor, the air density, and the impeller radius.
22. The power control device according to any one of claims 13 to 21, wherein the set power determining unit is configured to:
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.
23. The power control device according to any one of claims 13 to 21, wherein the output control unit is configured to:
if the set power is larger than the rated power, controlling the wind turbine generator to output in an over-running state;
and if the set power is smaller than the rated power, controlling the wind turbine generator to output in a power limiting state.
24. The power control device according to any one of claims 13 to 21, characterized in that the power control device further comprises:
the data management unit is configured to input set power of the wind turbine generator set as an upper limit of active power of the wind turbine generator set to a management system after the set power is determined based on the electrical boundary power and the stall boundary power of the wind turbine generator set, and the management system is used for carrying out power scheduling according to power grid requirements and the upper limit of the active power.
25. A computer-readable storage medium storing computer program instructions, characterized in that the computer program instructions, when executed by a processor, implement the power control method of a wind turbine according to any of claims 1 to 12.
26. A computing device, the computing device comprising:
a processor;
a memory storing computer program instructions which, when executed by the processor, implement the power control method of a wind turbine according to any of claims 1 to 12.
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| CN202111106257.1A CN115839304A (en) | 2021-09-22 | 2021-09-22 | Power control method and device for wind turbine generator |
| PCT/CN2021/138299 WO2023045121A1 (en) | 2021-09-22 | 2021-12-15 | Power control method and device for wind generating set |
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| CN202111106257.1A CN115839304A (en) | 2021-09-22 | 2021-09-22 | Power control method and device for wind turbine generator |
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| JP2002062942A (en) * | 2000-08-22 | 2002-02-28 | Sanyo Electric Industries Co Ltd | Control device for independent power source by wind power generator |
| CN101054951A (en) * | 2007-05-24 | 2007-10-17 | 上海交通大学 | Large scale wind power machine control method based on maximum energy capture |
| CN102709939B (en) * | 2012-05-22 | 2014-04-30 | 中国电力科学研究院 | Active power control method of wind power station for improving power generation efficiency of wind power station |
| IT201800007930A1 (en) * | 2018-08-07 | 2020-02-07 | Università Degli Studi Di Genova | Method and control system of non-inertial generators, in particular wind turbines, by means of inertia emulation |
| CN109812379B (en) * | 2019-04-10 | 2020-08-18 | 浙江大学 | Power control method for tidal current energy machine set with maximized economic benefit |
| CN111478318B (en) * | 2020-04-17 | 2021-11-19 | 许昌许继风电科技有限公司 | Operation control method based on wind generating set power limitation |
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