Parameter identification method and parameter identification device of wind turbine

Abstract

A parameter identification method and a parameter identification device for a wind turbine are disclosed, wherein the parameter identification method includes: controlling the no-load start-up and shutdown of the generator by adjusting the blade angle; obtaining the operation data of the generator during the no-load start-up and shutdown of the generator; and determining the parameters of the generator based on the obtained operation data of the generator. The technical solution disclosed in the present invention can realize the identification of the parameters of the generator by the control system, eliminating the link of manually configuring the parameters of the generator in the control system, and avoiding the risk of decreased control performance or instability of the control system caused by incorrect configuration of the parameters of the generator.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and more specifically, to a parameter identification method and a parameter identification device of a wind generator. Background Art

[0002] At present, in the wind power generation industry, vector control is generally used for wind turbines. Vector control can realize the decoupling control of weak magnetic field and torque, and has the characteristics of fast control response, high precision and excellent control performance. However, since the control performance of vector control is highly dependent on the accuracy of wind turbine parameters, inaccurate wind turbine parameters will affect the control performance of the unit. Therefore, at present, the motor parameters are mainly written into the control system through manual configuration according to the wind turbine parameter table to realize the control function.

[0003] However, the above-mentioned method of manually configuring the parameters of the wind turbine generator has disadvantageous factors that affect the control performance, maintenance efficiency, and even the operational safety of the wind turbine generator. Summary of the invention

[0004] The present disclosure provides a parameter identification method and a parameter identification device for a wind turbine from the perspective of solving the problem of manually configuring the parameters of a wind turbine, so as to at least solve the technical problems mentioned in the background technology.

[0005] According to one aspect of an exemplary embodiment of the present disclosure, a parameter identification method for a wind turbine is provided, wherein the parameter identification method comprises: controlling the no-load start-up and shutdown of the generator by adjusting the blade angle; acquiring the operating data of the generator during the period from the no-load start-up to the shutdown of the generator; and determining the parameters of the generator based on the acquired operating data of the generator.

[0006] According to another aspect of the exemplary embodiment of the present disclosure, a parameter identification device of a wind turbine is provided, wherein the parameter identification device includes: a start-stop control unit, configured to control the no-load start-up and shutdown of the generator by adjusting the blade angle; a parameter acquisition unit, configured to acquire the operating data of the generator during the period from the no-load start-up to the shutdown of the generator; and a parameter determination unit, configured to determine the parameters of the generator based on the acquired operating data of the generator.

[0007] According to another aspect of the exemplary embodiments of the present disclosure, a computer-readable storage medium storing a computer program is provided, wherein when the computer program is executed by a processor, the parameter identification method of the wind turbine described in the present disclosure is implemented.

[0008] According to another aspect of the exemplary embodiments of the present disclosure, an electronic device is provided, comprising: at least one processor; and at least one memory storing computer executable instructions, wherein the computer executable instructions, when executed by the at least one processor, prompt the at least one processor to execute the parameter identification method of the wind turbine described in the present disclosure.

[0009] In summary, by using the technical solution provided by the present disclosure, the no-load start-up and shutdown of the generator can be controlled by adjusting the blade pitch. In this process, the rotor angle, pole pair number and flux linkage of the generator can be measured by setting the manual enabling control closing mode of the generator side circuit breaker when the fan is stopped, and the manual enabling control closing mode of the circuit breaker can also ensure the safety of the staff. After the generator is shut down, the modulation signal (for example, a DC voltage or a high-frequency pulse voltage signal) for excitation can be output to the generator by setting the manual enabling modulation mode of the IGBT on the rectifier side of the converter when the fan is shut down, so as to measure the stator resistance and inductance parameters of the generator when the generator is shut down. The scheme as a whole can realize the recognition of the generator parameters by the control system, eliminate the link of manually configuring the generator parameters in the control system, and reduce the manpower cost; the control software version is greatly reduced, and the software maintenance cost is reduced; and the risk of control performance degradation or control system instability caused by the wrong configuration of the generator parameters is avoided. In addition, the technical solution of the present disclosure is mainly realized by optimizing the software control, which avoids the increase of cost and improves the applicability of the scheme.

[0010] 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

[0011] The above and other objects and features of the exemplary embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings which exemplarily illustrate the embodiments, in which:

[0012] Figure 1 is a flow chart showing a parameter identification method of a wind turbine according to an exemplary embodiment of the present disclosure;

[0013] Figure 2 is a block diagram showing a parameter identification device of a wind turbine generator according to an exemplary embodiment of the present disclosure;

[0014] Figure 3 is a schematic diagram showing an application example of a parameter identification method for a wind turbine generator according to an exemplary embodiment of the present disclosure;

[0015] Figure 4is a schematic diagram showing a manual control closing mode of a wind turbine generator circuit breaker according to an exemplary embodiment of the present disclosure;

[0016] Figure 5 Schematic diagram showing a manual enabling mode of an IGBT on the rectifier side of a wind turbine generator according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0017] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, the description of features known in the art may be omitted.

[0018] The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present application.

[0019] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs after understanding the present disclosure. Unless explicitly defined as such herein, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal manner.

[0021] Furthermore, in the description of examples, when it is considered that a detailed description of a well-known related structure or function would cause vague interpretation of the present disclosure, such a detailed description will be omitted.

[0022] The existing control method of manually configuring the motor parameters according to the motor parameter table and writing them into the control system often has a certain probability of causing the wind turbine parameter configuration error due to operator misoperation or other factors. The wind turbine parameter configuration error will greatly affect the control performance, and even the safety of the rigid unit operation in serious cases. In addition, when the number and types of wind turbines in the wind farm increase, the manual configuration of wind turbine parameters will also greatly increase the number of software configuration table versions, seriously affecting the efficiency of software maintenance.

[0023] Based on the above reasons, from the perspective of solving the problem of manual configuration of wind turbine parameters, a parameter identification solution suitable for wind turbines can be designed to realize automatic identification of wind turbine parameters, thereby replacing the existing solution of manual configuration of wind turbine parameters, thereby improving the unit operation reliability and software maintenance efficiency.

[0024] Figure 1 is a flow chart showing a parameter identification method of a wind turbine according to an exemplary embodiment of the present disclosure. Figure 1 , the wind turbine parameter identification method includes steps S110 to S130.

[0025] In step S110, the no-load start and shutdown of the generator is controlled by adjusting the blade angle.

[0026] Here, "by adjusting the blade angle" can be achieved in the following ways. For example, the corresponding variable pitch device can be controlled by automatic control software to control the rotation of the blades of the wind turbine generator set. The "no-load" means that the voltage output terminal of the wind turbine generator is not connected to a load, that is, the external output power is zero.

[0027] It can be understood that when the blades start to change pitch and rotate from a stationary state, the blade angle begins to change, and the wind turbine starts to run at no load. When the blades gradually change from a rotating state to a stationary state, the wind turbine gradually switches from a no-load running state to a shutdown state.

[0028] In step S120, during the period from no-load startup to shutdown of the generator, the operation data of the generator is acquired. Here, the operation data of the generator includes but is not limited to the generator terminal voltage, the generator terminal current and the generator speed.

[0029] It is understood that the operation data of the generator can be obtained in the following ways: For example, the generator terminal voltage and current are collected in real time according to a preset sampling period, and the generator speed is received synchronously measured by the generator main control system.

[0030] In one embodiment, the generator terminal voltage can be a three-phase voltage: a phase voltage U a, b-phase voltage U b and c phase voltage U c , the generator output voltage is collected in real time according to the preset sampling period, that is, the three-phase terminal voltage of the generator output is collected in real time according to the preset sampling period.

[0031] The above-mentioned “machine-end current” may be the current output by the generator in response to input excitation after the IGBT on the rectifier side of the converter sends a high-frequency pulse voltage signal or a DC voltage to the generator after the wind turbine generator is shut down.

[0032] The “preset sampling period” here may be microseconds, and the specific time may be adjusted according to demand, and the present disclosure does not make any specific limitation on this.

[0033] The above-mentioned "generator speed synchronously measured by the generator master control system" can be realized by any available means. For example, a magnet is fixed to the rotating part of the generator, and a Hall switch is set at the outer edge of the circumference of the magnet's motion track. When the generator rotates, the Hall switch periodically senses the magnetic lines of force and generates a pulse voltage. The pulses are counted within a certain period of time, and the generator speed can be converted.

[0034] In an optional embodiment, before the generator is started without load, the parameter identification method further includes: closing a circuit breaker between the rectifier side of the converter and the generator to conduct the generator and the converter.

[0035] Reference Figure 4 , the machine side circuit breaker 1 and the machine side circuit breaker 2 are respectively arranged between the generator and the corresponding converter rectifier side. It can be understood that the function of setting the circuit breaker closing mode may include providing safety protection for the staff. Specifically, when the wind turbine is stopped and the staff is preparing to perform parameter identification on the wind turbine generator, by closing the circuit breaker, it can be made clear that the converter rectifier side and the generator are turned on, thereby avoiding the occurrence of dangerous situations such as electric shock.

[0036] Figure 4 The "manual closing mode of circuit breaker" shown in the figure may refer to manual control enabling, for example, a worker may manually trigger the switch of a control device for controlling the closing or opening of the circuit breaker, and the control device itself may realize the closing operation of the circuit breaker through the automatic control software running thereon. The manual control here also includes manual closing, so that the generator side circuit breaker can be attracted when the unit is shut down.

[0037] In step S130 , parameters of the generator are determined based on the acquired operating data of the generator.

[0038] First of all, it should be noted that the parameters of the generator in the present disclosure include the generator rotor position angle, pole pair number parameters, flux linkage parameters, stator resistance and inductance parameters.

[0039] It can be understood that the generator rotor position angle can be determined in the following manner.

[0040] For example, the real-time rotor position angle θ of the generator during operation can be determined based on the real-time collected generator terminal voltage. 运行 and the rotor position angle θ when the generator is shut down 停机 .

[0041] Specifically, first, the three-phase terminal voltage output by the generator is converted into the α-axis voltage and β-axis voltage of the generator in a two-phase stationary coordinate system. Then, based on the determined α-axis voltage and β-axis voltage, the real-time rotor position angle θ of the generator during operation is calculated. 运行 , and the rotor position angle θ when the generator is stopped 停机 .

[0042] Here, as an optional embodiment, the a-phase voltage U can be converted to a , b-phase voltage U b and c phase voltage U c Converted to α-axis voltage U a and β-axis voltage U β Alternatively, other available methods may be used, which is not limited in the present disclosure.

[0043] Regarding the calculation of the generator rotor position angle, please refer to formula (1) for implementation.

[0044]

[0045] Specifically, referring to formula (1), according to the determined α-axis voltage U a and β-axis voltage U β , calculate the real-time rotor position angle θ when the generator is running 运行 , and the rotor position angle θ when the generator is stopped 停机 The steps include: during the period from no-load start-up to shutdown of the generator, in response to the α-axis voltage being a non-zero value, calculating in real time the inverse tangent value of the ratio of the α-axis voltage to the β-axis voltage in each sampling period, and obtaining the real-time rotor position angle θ 运行 In response to the α-axis voltage being zero in the sampling period, the inverse tangent value of the ratio of the α-axis voltage to the β-axis voltage in the previous sampling period is used as the rotor position angle θ when the generator is stopped 停机 Here, “in response to the α-axis voltage being zero in the sampling period” may mean that if the α-axis voltage is zero in a plurality of consecutive sampling periods, it may be confirmed that the generator is shut down.

[0046] For another example, the rotor position of the wind turbine generator may be directly measured by providing a specific measuring device.

[0047] It can be understood that the number of pole pairs and the flux linkage of the generator can be determined in a variety of ways.

[0048] For example, as an optional embodiment, the peak voltage of any phase of the three-phase terminal voltage of the generator collected in any sampling period, the generator speed and the real-time rotor position angle θ 运行 , determine the number of pole pairs P of the generator n And magnetic links

[0049] According to the situation, for the above determination of the number of pole pairs P of the generator n And magnetic links The embodiment can be specifically implemented in the following manner:

[0050] For example, since the inertia of the wind turbine impeller is very large, the speed of the generator can be considered to be a fixed value within a certain period of time, so the pole pair number P can be calculated by referring to formulas (2) to (4): n And magnetic links

[0051]

[0052]

[0053]

[0054] Where f is the generator frequency, P n is the number of generator pole pairs, and n is the generator speed. k_ is the peak voltage of phase k in the three-phase terminal voltage, where k can be any phase among phase a, phase b, and phase c. The peak voltage of phase a in the three-phase terminal voltage of the generator is selected as an example to perform the calculation. Specifically, based on the real-time rotor position angle θ 运行 The change in unit time determines the frequency of the generator during no-load operation; the number of pole pairs P of the generator is determined based on the frequency and speed of the generator. n ; Determine the flux linkage of the generator based on the above peak voltage and frequency

[0055] For another example, first, the real-time rotor angle θ corresponding to any sampling period and the previous sampling period adjacent to the sampling period can be determined. 运行 , calculate the difference dθ before and after. Then, calculate the angular change dθ / dt per unit time of the difference dθ in the sampling period, and get the generator electrical angular velocity w e Next, based on the generator electrical angular velocity w e The ratio of the generator speed n to the generator pole pair number P is obtained. n (Right now ). Finally, based on the peak voltage U peak and the generator electrical angular velocity w e The ratio of f .

[0056] For another example, first, the real-time rotor angle θ corresponding to any sampling period and the previous sampling period adjacent to the sampling period can be determined. 运行 , calculate the difference dθ before and after. Then, calculate the angular change dθ / dt of the difference dθ per unit time in the sampling period, and multiply the calculated angular change by the generator speed n to obtain the generator mechanical angular velocity Ω. Next, based on the generator mechanical angular velocity Ω and the generator speed n, the number of pole pairs Pn (i.e. ). Finally, based on the peak voltage U peak The flux linkage ψ is obtained by multiplying the ratio of the mechanical angular velocity Ω of the generator by the generator speed n. f .

[0057] It can be understood that the stator resistance of the generator can be determined in the following manner.

[0058] For example, after controlling the generator to stop by adjusting the blade angle, first, the switch tube on the converter rectifier side can be controlled to operate in a preset working mode so that the converter rectifier side continues to output a DC voltage to the generator. Then, after the current in the circuit formed by the converter rectifier side and the generator is stable, the three-phase terminal voltage and three-phase stator current output by the generator can be collected. Finally, the stator resistance of the generator is determined based on the collected three-phase terminal voltage and three-phase stator current. The above-mentioned preset working mode is that the upper tube of any phase switch tube on the converter rectifier side is turned on, and the lower tubes of the other two phase switch tubes are turned on.

[0059] Reference Figure 5 , the converter rectifier side can support manual enable control mode. For example, the staff can trigger the switch of the control device used to control the output signal mode of the converter rectifier side. The control device can control the corresponding switch tube to be turned on and off through the pre-set automatic control software, so that the converter rectifier side can continue to output DC voltage to the generator. The manual enable here can also be used directly without triggering the software, so that the unit can manually control the IGBT to work according to the set modulation wave when it is shut down.

[0060] Furthermore, the step of determining the stator resistance of the generator based on the three-phase terminal voltage and three-phase stator current output by the generator may include: first, determining the target phase voltage of the phase corresponding to the switch tube with the upper tube turned on in the three-phase terminal voltage; then, determining the target phase current of the phase corresponding to the switch tube with the upper tube turned on in the three-phase stator current; again, determining the line voltage between the target phase voltage and the phase voltage adjacent to it in phase sequence; finally, obtaining the stator resistance of the generator based on the above line voltage and target phase current.

[0061] Here, corresponding to the combination relationship between the above-mentioned "three-phase terminal voltage and three-phase stator current", the preset working mode may include any one of the following three working modes A to C. Specifically, in mode A, the upper tube of the a-phase switch tube on the rectifier side of the converter is turned on, and the lower tubes of the b-phase and c-phase switch tubes are turned on; in mode B, the upper tube of the b-phase switch tube on the rectifier side of the converter is turned on, and the lower tubes of the a-phase and c-phase switch tubes are turned on; in mode C, the upper tube of the c-phase switch tube on the rectifier side of the converter is turned on, and the lower tubes of the a-phase and b-phase switch tubes are turned on.

[0062] Specifically, corresponding to mode A, referring to formula (5), the stator resistance R of the generator is determined based on the generator output voltage and the generator stator current: s The steps include: according to the a-phase voltage U output by the generator a And b phase voltage U b Determine the line voltage U ab , the line voltage U ab With phase a current i a The ratio of is multiplied by a predetermined coefficient to obtain the stator resistance R of the generator. s .

[0063]

[0064] Corresponding to mode B, referring to formula (6), the stator resistance R of the generator is determined based on the generator output voltage and the generator stator current. s The steps include: according to the b-phase voltage U output by the generator b And the c-phase voltage U c Determine the line voltage U bc , the line voltage U bc With phase b current i b The ratio of is multiplied by a predetermined coefficient to obtain the stator resistance R of the generator. s .

[0065]

[0066] Corresponding to mode C, referring to formula (7), the stator resistance R of the generator is determined based on the generator output voltage and the generator stator current. s The steps include: according to the c-phase voltage U output by the generatorc And the a-phase voltage U a Determine the line voltage U ca , the line voltage U ca With c phase current i c The ratio of is multiplied by a predetermined coefficient to obtain the stator resistance R of the generator. s .

[0067]

[0068] It can be understood that the “inductance parameter of the generator” can be determined in the following two ways.

[0069] For example, for the first method, after the generator is shut down by adjusting the blade angle, the switch tube on the rectifier side of the converter is controlled to output a high-frequency pulse voltage signal to the generator winding. Then, the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the high-frequency pulse voltage signal are collected. Next, based on the three-phase terminal voltage, three-phase stator current and the rotor position angle θ when the generator is shut down, 停机 , determine the d-axis voltage U of the generator within the target sampling period d , q-axis voltage U q , d-axis current i d , q-axis current i q Finally, based on the d-axis voltage U of the generator in the target sampling period d , q-axis voltage U q , d-axis current i d , q-axis current i q And preset sampling period, determine the d-axis inductance L of the generator d And the q-axis inductance L q .

[0070] Here, refer to Figure 5 The rectifier side of the converter can support a manual enable mode. For example, the staff can trigger the switch of the control device used to control the output signal mode of the rectifier side of the converter. The control device can control the conduction and disconnection of the corresponding switch tube through the pre-set automatic control software, so that the switch tube on the rectifier side of the converter outputs a high-frequency pulse voltage signal.

[0071] The collected three-phase terminal voltage includes phase a voltage U a , b-phase voltage U b and c phase voltage U c The three-phase stator current includes the a-phase current i a , b-phase current i b and c-phase current i c .

[0072] The above-mentioned “based on the three-phase terminal voltage, three-phase stator current and rotor position angle θ when the generator is stopped 停机 , determine the d-axis voltage U of the generator within the target sampling period d , q-axis voltage U q , d-axis current i d , q-axis current i q The steps of " may include: first, using Clark transformation to convert the a-phase voltage U a , b-phase voltage U b and c phase voltage U c Converted to the α-axis voltage U in the stationary coordinate system a and β-axis voltage U β Then, using Park transform, based on the rotor position angle θ 停机 , the α-axis voltage U a and β-axis voltage U β Converted to the d-axis voltage U in the rotating coordinate system d and q-axis voltage U q For phase a current i a , b-phase current i b and c-phase current i c Similarly, the d-axis current i in the rotating coordinate system can be obtained by the above-mentioned Clark transformation and Park transformation. d and q-axis voltage i q .

[0073] Since the high-frequency pulse signal has a short action time and the stator winding current is small, the voltage drop on the stator resistance can be ignored. At the same time, since the generator is stopped, the speed is zero. Based on this, the above "Determine the d-axis inductance L of the generator d And the q-axis inductance L q " can be executed according to the following formula:

[0074]

[0075]

[0076] Among them, T s is the target sampling period, and the d-axis current i involved in the formula d_n and i d_n- The corresponding sampling calculation time interval is the target sampling period T s , q-axis current i q_n and i q_n-1 The corresponding sampling calculation time interval is also the target sampling period T s .

[0077] For another example, for the second method, first, after the generator is stopped by adjusting the blade angle, the switch tube on the rectifier side of the converter is controlled to output a high-frequency pulse voltage signal to the generator winding. Then, the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the high-frequency pulse voltage signal are collected. Next, based on the three-phase terminal voltage, three-phase stator current and the rotor angle θ when the generator is stopped, 停机 , determine the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, and the average value of the q-axis current of the generator within k target sampling periods. Finally, based on the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, the average value of the q-axis current and the duration of the k sampling periods, determine the d-axis inductance and q-axis inductance of the generator.

[0078] It should be noted here that the difference between the second method of determining the "inductance parameters of the generator" mentioned above and the first method is that the parameters involved in the calculation, such as "d-axis voltage, d-axis current, q-axis voltage, q-axis current", are replaced with the average values ​​corresponding to multiple target sampling periods, and then the relevant calculations are performed to obtain the average value of the inductance parameters of the generator.

[0079] Specifically, refer to the following formula:

[0080]

[0081]

[0082] Among them, kT s represents k target sampling periods, are the average values ​​of the generator inductance parameters within k target sampling periods, are the average values ​​of the generator d-axis voltage and q-axis voltage within k sampling periods, are the average d-axis current of the first k target sampling periods and the average d-axis current of the last k target sampling periods, They are the average q-axis current of the first k target sampling periods and the average q-axis current of the last k target sampling periods, respectively.

[0083] As described above, by using the wind turbine parameter identification method including steps S110 to S130 of the present disclosure, key parameters of the wind turbine can be effectively identified, including rotor angle, pole pair number, flux linkage, stator resistance and inductance. Optionally, these parameters can be solidified in the controller to achieve control of the wind turbine.

[0084] Refer to the following Figure 3 The parameter identification method of the wind turbine disclosed in the present invention is described with reference to an application example.

[0085] Reference Figure 3 In step S301, it is determined whether the wind turbine generator is in a shutdown state; if it is in a shutdown state, step S302 is executed, otherwise, no operation is performed;

[0086] In step S302, the machine-side circuit breaker can be closed manually. Here, "manual" may refer to manual enabling. For example, a worker may manually trigger a switch of a control device for controlling the closing or opening of the circuit breaker. The control device itself may realize the closing operation of the circuit breaker through the automatic control software running thereon. Figure 4 Here, the machine-side circuit breaker refers to the circuit breaker installed between the wind turbine generator and the rectifier side of the converter.

[0087] In step S303, the blades of the wind turbine may be controlled to change pitch and rotate, so that the wind turbine can start, run and stop.

[0088] In step S304, during the pitch change process performed in step S303, the rotor angle, pole pair number and flux linkage of the wind turbine are calculated based on formulas (1) to (4) described above in the present disclosure.

[0089] In step S305, the machine-side modulation is manually enabled, that is, the corresponding switch tube is controlled to be turned on and off according to the situation to realize IGBT control, so that the rectifier side of the converter continues to output DC voltage to the generator; or, the switch tube on the rectifier side of the converter outputs a high-frequency pulse voltage signal.

[0090] In step S306 , the IGBT is controlled to output a DC voltage to the wind generator.

[0091] In step S307, after the current in the circuit formed by the rectifier side of the converter and the generator is stabilized, the three-phase terminal voltage and three-phase stator current output by the wind turbine in response to the excitation of the DC voltage are collected, and then the stator resistance of the generator is calculated based on the three-phase terminal voltage and the three-phase stator current.

[0092] In step S308, the IGBT is controlled to output a high-frequency pulse voltage signal to the wind generator winding.

[0093] In step S309, after the current in the circuit formed by the rectifier side of the converter and the generator is stabilized, the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the above-mentioned high-frequency pulse voltage signal are collected, and then the inductance of the generator is calculated based on the three-phase terminal voltage, the three-phase stator current and the rotor angle calculated in the above-mentioned step S340.

[0094] In step S310, the generator parameters calculated in the above steps are fixed to the controller for executing control of the wind turbine generator.

[0095] In summary, by using the technical solution provided by the present disclosure, the no-load start-up and shutdown of the generator can be controlled by adjusting the blade pitch. In this process, the rotor angle, pole pair number and flux linkage of the generator can be measured by setting the manual enabling control closing mode of the generator side circuit breaker when the fan is stopped, and the manual enabling control closing mode of the circuit breaker can also ensure the safety of the staff. After the generator is shut down, the modulation signal (for example, a DC voltage or a high-frequency pulse voltage signal) for excitation can be output to the generator by setting the manual enabling modulation mode of the IGBT on the rectifier side of the converter when the fan is shut down, so as to measure the stator resistance and inductance parameters of the generator when the generator is shut down. The scheme as a whole can realize the recognition of the generator parameters by the control system, eliminate the link of manually configuring the generator parameters in the control system, and reduce the manpower cost; the control software version is greatly reduced, and the software maintenance cost is reduced. In addition, the risk of control performance degradation or control system instability caused by the wrong configuration of the generator parameters can also be avoided. In addition, the technical solution of the present disclosure is mainly realized by optimizing the software control, without adding any hardware equipment, avoiding the increase of cost and improving the applicability of the scheme.

[0096] Figure 2 1 is a block diagram showing a parameter identification device for a wind turbine generator according to an exemplary embodiment of the present disclosure. Figure 1 The parameter identification method shown, therefore, the specific implementation of the parameter identification device can refer to the implementation of the parameter identification method, and the repeated parts will not be repeated.

[0097] Reference Figure 2 The parameter identification device 200 of the wind turbine generator includes a start-stop control unit 210, a parameter acquisition unit 220 and a parameter determination unit 230, and the units are communicatively coupled.

[0098] The start-stop control unit 210 can control the no-load start-up and shutdown of the generator by adjusting the blade angle; the parameter acquisition unit 220 can acquire the operating data of the generator during the period from no-load start-up to shutdown of the generator; the parameter determination unit 230 can determine the parameters of the generator based on the acquired operating data of the generator. The operating data of the generator includes the generator terminal voltage, the generator terminal current and the generator speed.

[0099] Optionally, the parameter identification device 200 further includes a circuit breaker control unit 240, which can close the circuit breaker between the rectifier side of the converter and the generator before the generator is started without load, so as to conduct the generator and the converter.

[0100] In response to receiving the enable instruction, the parameter acquisition unit 220 can control the converter to collect the generator terminal voltage and current in real time according to a preset sampling period, and receive the generator speed synchronously measured by the generator main control system.

[0101] The parameter determination unit 230 can determine the real-time rotor position angle θ when the generator is running according to the real-time collected generator terminal voltage. 运行 and the rotor position angle θ when the generator is shut down 停机 .

[0102] Specifically, the parameter determination unit 230 can determine the α-axis voltage and β-axis voltage at the generator end in a two-phase stationary coordinate system based on the three-phase terminal voltage output by the generator, and calculate the real-time rotor position angle θ when the generator is running according to the determined α-axis voltage and β-axis voltage. 运行 , and the rotor position angle θ when the generator is stopped 停机 .

[0103] Furthermore, during the period from the generator no-load start-up to shutdown, the parameter determination unit 230 can calculate the inverse tangent value of the ratio of the α-axis voltage to the β-axis voltage in each sampling period in real time in response to the α-axis voltage being a non-zero value, and obtain the real-time rotor position angle θ 运行 In response to the α-axis voltage being zero in the sampling period, the inverse tangent value of the ratio of the α-axis voltage to the β-axis voltage in the previous sampling period is used as the rotor position angle θ when the generator is stopped 停机 .

[0104] Alternatively, the parameter determination unit 230 may be based on the peak voltage of any phase of the three-phase terminal voltage of the generator collected in any sampling period, the generator speed and the real-time rotor position angle θ 运行 , determine the number of pole pairs and magnetic flux of the generator.

[0105] Further, the parameter determination unit 230 may be based on the real-time rotor position angle θ 运行 The change in unit time determines the frequency of the generator during no-load operation, the number of pole pairs of the generator is determined based on the frequency of the generator and the generator speed, and the flux linkage of the generator is determined based on the peak voltage and frequency.

[0106] Optionally, after the start-stop control unit 210 controls the generator to stop by adjusting the blade angle, the parameter acquisition unit 220 can control the switch tube on the converter rectifier side to operate in a preset operating mode so that the converter rectifier side continues to output a DC voltage to the generator. After the current in the circuit formed by the converter rectifier side and the generator is stable, the three-phase terminal voltage and three-phase stator current output by the generator are collected. The stator resistance of the generator is determined based on the three-phase terminal voltage and the three-phase stator current.

[0107] Specifically, the above-mentioned preset working mode is a mode in which the upper tube of the switch tube of any phase on the rectifier side of the converter is turned on, and the lower tubes of the switch tubes of the other two phases are turned on.

[0108] Furthermore, the parameter determination unit 230 can determine the target phase voltage of the phase corresponding to the switching tube with the upper tube turned on in the three-phase terminal voltage, determine the target phase current of the phase corresponding to the switching tube with the upper tube turned on in the three-phase stator current, determine the line voltage between the target phase voltage and the phase voltage adjacent to it in phase order, and obtain the stator resistance of the generator based on the line voltage and the target phase current.

[0109] Optionally, after the generator is stopped by adjusting the blade angle, the parameter acquisition unit 220 can control the switch tube on the rectifier side of the converter to output a high-frequency pulse voltage signal to the generator winding, and collect the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the high-frequency pulse voltage signal. The parameter determination unit 230 can be based on the three-phase terminal voltage, the three-phase stator current and the rotor position angle θ when the generator is stopped. 停机 , determine the d-axis voltage, q-axis voltage, d-axis current, and q-axis current of the generator within a target sampling period, and determine the d-axis inductance and q-axis inductance of the generator based on the d-axis voltage, q-axis voltage, d-axis current, q-axis current of the generator within the target sampling period and a preset sampling period.

[0110] Optionally, after the generator is stopped by adjusting the blade angle, the parameter acquisition unit 220 can control the switch tube on the rectifier side of the converter to output a high-frequency pulse voltage signal to the generator winding, and collect the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the high-frequency pulse voltage signal. The parameter determination unit 230 can be based on the three-phase terminal voltage, the three-phase stator current and the rotor angle θ when the generator is stopped. 停机 , determine the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, and the average value of the q-axis current of the generator within k target sampling periods, and determine the d-axis inductance and q-axis inductance of the generator based on the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, the average value of the q-axis current and the duration of the k sampling periods.

[0111] It should be understood that the various units / modules in the parameter identification device of the wind turbine according to the exemplary embodiment of the present disclosure can be implemented as hardware components and / or software components. Those skilled in the art can implement the various units / modules, for example, using a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC) according to the processing performed by the various defined units / modules.

[0112] According to another aspect of the exemplary embodiments of the present disclosure, a computer-readable storage medium storing a computer program is provided, wherein when the computer program is executed by a processor, the parameter identification method described in the present disclosure is implemented.

[0113] Specifically, the control method according to the exemplary embodiment of the present disclosure may be written as a computer program, a code segment, an instruction, or any combination thereof, and recorded, stored, or fixed in or on one or more non-transitory computer-readable storage media. The computer-readable storage medium is any data storage device that can store data read out by a computer system. Examples of computer-readable storage media include: read-only memory, random access memory, read-only optical disk, magnetic tape, floppy disk, optical data storage device, and carrier wave (such as data transmission through the Internet via a wired or wireless transmission path).

[0114] According to another aspect of the exemplary embodiments of the present disclosure, an electronic device is provided, wherein the electronic device includes: at least one processor; and at least one memory storing computer executable instructions, wherein the computer executable instructions, when executed by the at least one processor, prompt the at least one processor to execute the parameter identification method described in the present disclosure.

[0115] Specifically, the electronic device can be broadly a tablet computer, a smart phone, a smart watch, or any other electronic device with necessary computing and / or processing capabilities. In one embodiment, the electronic device may include a processor, a memory, a network interface, a communication interface, etc. connected via a system bus. The processor of the electronic device can be used to provide necessary computing, processing and / or control capabilities. The memory of the electronic device may include a non-volatile storage medium and an internal memory. An operating system, a computer program, etc. may be stored in or on the non-volatile storage medium. The internal memory may provide an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface and the communication interface of the electronic device can be used to connect and communicate with external devices via a network.

[0116] In summary, by using the technical solution provided by the present disclosure, the no-load start-up and shutdown of the generator can be controlled by adjusting the blade pitch. In this process, the rotor angle, pole pair number and flux linkage of the generator can be measured by setting the manual enabling control closing mode of the generator side circuit breaker when the fan is stopped, and the manual enabling control closing mode of the circuit breaker can also ensure the safety of the staff; after the generator is stopped, the modulation signal (for example, DC voltage or high-frequency pulse voltage signal) for excitation can be output to the generator by setting the manual enabling modulation mode of the IGBT on the rectifier side of the converter when the fan is stopped, so as to measure the stator resistance and inductance parameters of the generator when the generator is stopped. The scheme as a whole can realize the recognition of the generator parameters by the control system, eliminate the link of manually configuring the generator parameters in the control system, and reduce the manpower cost; the control software version is greatly reduced, and the software maintenance cost is reduced; the risk of control performance degradation or control system instability caused by the wrong configuration of the generator parameters is avoided. In addition, the technical solution of the present disclosure is mainly realized by optimizing the software control, without adding any hardware equipment, avoiding the increase of cost and improving the applicability of the scheme.

[0117] Although some exemplary embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that modifications may be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for identifying parameters of a wind turbine, characterized in that: The parameter identification method comprises: By adjusting the blade angle, the generator can be controlled to start and stop at no load; Acquiring operating data of the generator during the period from no-load startup to shutdown of the generator; determining parameters of the generator based on the acquired operating data of the generator, After the generator is stopped by adjusting the blade angle, the parameter identification method further includes: Control the switch tube on the rectifier side of the converter to output a high-frequency pulse voltage signal to the generator winding; collecting the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the high-frequency pulse voltage signal; Based on the three-phase terminal voltage, three-phase stator current and the rotor angle θ when the generator is shut down 停机 , determine the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, and the average value of the q-axis current of the generator within k target sampling periods; The d-axis inductance and q-axis inductance of the generator are determined based on the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, the average value of the q-axis current, and the duration of the k sampling periods.

2. The parameter identification method according to claim 1, characterized in that: The operating data of the generator includes the generator terminal voltage, the generator terminal current and the generator speed.

3. The parameter identification method according to claim 1, characterized in that: Before the generator is started at no-load, the parameter identification method further includes: closing a circuit breaker between the rectifier side of the converter and the generator to conduct the generator and the converter.

4. The parameter identification method according to claim 2, characterized in that: The step of determining the parameters of the generator based on the acquired operating data of the generator includes: According to the real-time collected generator terminal voltage, the real-time rotor position angle θ of the generator is determined when the generator is running. 运行 And the rotor position angle θ when the generator is shut down 停机 .

5. The parameter identification method according to claim 4, characterized in that: According to the real-time collected generator terminal voltage, the real-time rotor position angle θ of the generator is determined when the generator is running. 运行 And the rotor position angle θ when the generator is shut down 停机 The steps include: Determining the α-axis voltage and the β-axis voltage at the generator terminal in a two-phase stationary coordinate system based on the three-phase terminal voltage output by the generator; According to the determined α-axis voltage and β-axis voltage, the real-time rotor position angle θ of the generator is calculated when the generator is running. 运行 , and the rotor position angle θ when the generator is shut down 停机 .

6. The parameter identification method according to claim 5, characterized in that: According to the determined α-axis voltage and β-axis voltage, the real-time rotor position angle θ of the generator is calculated when the generator is running. 运行 , and the rotor position angle θ when the generator is shut down 停机 The steps include: During the period from no-load start to shutdown of the generator, in response to the α-axis voltage being a non-zero value, the inverse tangent value of the ratio of the α-axis voltage to the β-axis voltage in each sampling period is calculated in real time to obtain the real-time rotor position angle θ 运行 ; In response to the α-axis voltage being zero in the sampling period, the arc tangent value of the ratio of the α-axis voltage to the β-axis voltage in the previous sampling period is used as the rotor position angle θ when the generator is stopped. 停机 .

7. The parameter identification method according to claim 5, characterized in that: The step of determining the parameters of the generator based on the acquired operating data of the generator includes: The peak voltage of any phase of the three-phase terminal voltage of the generator, the generator speed and the real-time rotor position angle θ collected in any sampling period 运行 , determine the number of pole pairs and magnetic flux of the generator.

8. The parameter identification method according to claim 7, characterized in that: The peak voltage of any phase in the three-phase terminal voltage of the generator output based on any sampling period, the generator speed and the real-time rotor position angle θ 运行 , the step of determining the number of pole pairs and flux linkage of the generator includes: Based on the real-time rotor position angle θ 运行 Change in unit time, determining the frequency of the generator during no-load operation; determining the number of pole pairs of the generator based on the frequency and the speed of the generator; A flux linkage of a generator is determined based on the peak voltage and the frequency.

9. The parameter identification method according to claim 3, characterized in that: After the generator is stopped by adjusting the blade angle, the parameter identification method further includes: Controlling the switch tube on the rectifier side of the converter to operate in a preset operating mode so that the rectifier side of the converter continuously outputs a DC voltage to the generator; After the current in the circuit formed by the rectifier side of the converter and the generator is stable, collecting the three-phase terminal voltage and three-phase stator current output by the generator; The stator resistance of the generator is determined based on the three-phase terminal voltage and the three-phase stator current.

10. The parameter identification method according to claim 9, characterized in that: The preset working mode is that the upper tube of any phase switch tube on the rectifier side of the converter is turned on, and the lower tubes of the other two phase switch tubes are turned on; The step of determining the stator resistance of the generator based on the three-phase terminal voltage and the three-phase stator current includes: Determine a target phase voltage of a phase corresponding to the switching tube whose upper tube is turned on among the three-phase terminal voltage; Determining a target phase current of a phase corresponding to the switching tube whose upper tube is turned on in the three-phase stator current; determining a line voltage between the target phase voltage and a phase voltage adjacent to the target phase voltage; A stator resistance of the generator is obtained based on the line voltage and the target phase current.

11. A parameter identification device for a wind turbine, characterized in that: The parameter identification device comprises: The start-stop control unit is configured to: control the no-load start-up and shutdown of the generator by adjusting the blade angle; The parameter acquisition unit is configured to: acquire the operating data of the generator during the period from no-load startup to shutdown of the generator; a parameter determination unit configured to: determine the parameters of the generator based on the acquired operating data of the generator, Among them, after the generator is stopped by adjusting the blade angle, the parameter acquisition unit controls the switch tube on the rectifier side of the converter to output a high-frequency pulse voltage signal to the generator winding, and collects the three-phase terminal voltage and three-phase stator current output by the generator based on the excitation of the high-frequency pulse voltage signal; the parameter determination unit is based on the three-phase terminal voltage, three-phase stator current and the rotor angle θ when the generator is stopped. 停机 , determine the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, and the average value of the q-axis current of the generator within k target sampling periods, and determine the d-axis inductance and q-axis inductance of the generator based on the average value of the d-axis voltage, the average value of the q-axis voltage, the average value of the d-axis current, the average value of the q-axis current and the duration of the k sampling periods.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the parameter identification method for a wind turbine according to any one of claims 1 to 10 is implemented.

13. An electronic device, characterized in that: include: at least one processor; at least one memory storing computer-executable instructions, Wherein, when the computer executable instructions are executed by the at least one processor, the at least one processor is prompted to execute the parameter identification method of the wind turbine according to any one of claims 1 to 10.

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