Industrial fan control method and device based on thin film capacitor, equipment and medium

Abstract

The application belongs to the technical field of intelligent control, and discloses an industrial fan control method and device based on a thin film capacitor, equipment and a medium. The Clark transformation and the Park transformation are performed by acquiring three-phase real-time current values of a motor to obtain shaft real-time current values and shaft real-time current values. A target coefficient is calculated according to a DC bus voltage, the shaft real-time current values and the shaft real-time current values. The q-axis current instruction is calculated according to the target coefficient and the DC bus voltage. The d-axis current instruction is determined. The industrial fan is controlled to operate according to the q-axis current instruction and the d-axis current instruction. Therefore, the motor shaft current instruction can be adaptively and real-timely calculated according to the DC bus voltage, the q-axis current can follow the bus voltage fluctuation, the range of bus fluctuation is weakened, the stable control of the bus voltage is realized under the premise of ensuring the stable operation of the system, and the motor current distortion and torque pulsation are reduced.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology, specifically to an industrial fan control method, device, equipment, and medium based on thin-film capacitors. Background Technology

[0002] In the industrial fan industry, motor-driven fans typically employ an AC-DC-AC type driver. This means that three-phase AC power is converted to DC power by rectifier diodes and bus capacitors, and then a three-phase inverter generates voltage to drive the motor. During this energy conversion process, the voltage amplitude and frequency differ between the input and output sides, necessitating a DC bus capacitor to store energy. Large-capacity DC bus capacitors can store a significant amount of energy. When the motor load fluctuates greatly or reactive power needs to be supplied to the load, a pre-charging circuit is usually required to charge the DC bus capacitor to buffer the energy. Therefore, large electrolytic capacitors are typically chosen for the DC bus capacitor.

[0003] To address this issue, researchers have proposed several solutions. Some wind turbine manufacturers monitor the state of electrolytic capacitors by adding fault diagnosis observers. When an electrolytic capacitor is about to fail, the observer detects the abnormal condition and replaces it. This method can improve the lifespan of the wind turbine drive board, but it increases hardware costs and does not fundamentally change the problems of short lifespan, large size, low power factor, and poor reliability inherent in using aluminum electrolytic capacitors as DC bus capacitors.

[0004] Existing technologies propose using thin-film capacitors to replace electrolytic capacitors, which can effectively reduce hardware costs, lower heat generation temperature, and extend the service life of the fan drive board.

[0005] However, in practice, it has been found that in systems where large-capacity electrolytic capacitors are replaced by thin-film capacitors, the energy storage capacity of the DC bus capacitor is greatly reduced, and the bus voltage fluctuates violently with the power pulsation of the grid. Traditional current control strategies are difficult to adapt to this dynamic voltage change, resulting in motor current distortion and torque pulsation. Summary of the Invention

[0006] To address the aforementioned shortcomings, the present invention aims to provide an industrial fan control method, device, equipment, and medium based on thin-film capacitors, which can achieve stable control of the bus voltage, thereby reducing motor current distortion and torque pulsation.

[0007] The first aspect of this invention discloses an industrial fan control method based on thin-film capacitors, comprising: Obtain the real-time current values ​​of any two phases of the motor, and determine the real-time current values ​​of the three phases of the motor based on the real-time current values ​​of any two phases of the motor. Based on the real-time three-phase current values ​​of the motor, a Clark transformation is performed to obtain... Real-time shaft current value and Real-time shaft current value; Obtain the motor rotor angle measured by the observer, and based on the motor rotor angle, the... Real-time shaft current value and the The real-time shaft current value is subjected to Park transformation to obtain... Real-time shaft current value and Real-time shaft current value; Acquire the DC bus voltage on the motor drive circuit of the industrial fan, as collected by the sensor; According to the DC bus voltage, the Real-time shaft current value and the Calculate the target coefficient based on the real-time shaft current value; The q-axis current command is calculated based on the target coefficient and the DC bus voltage. Determine the d-axis current command; The operation of the industrial fan is controlled according to the q-axis current command and the d-axis current command.

[0008] In some embodiments, based on the DC bus voltage, the Real-time shaft current value and the Real-time shaft current value, calculation of target coefficient, including: According to the DC bus voltage, the Real-time shaft current value and the Calculate the instantaneous grid-side power required by the motor based on the real-time shaft current value; The target coefficient is calculated based on the instantaneous power on the grid side and the maximum power of the wind turbine.

[0009] In some embodiments, based on the DC bus voltage, the Real-time shaft current value and the The real-time shaft current value is used to calculate the instantaneous grid-side power required by the motor, including: The required instantaneous power on the grid side for the motor can be calculated using the following formula: In the formula, P in U represents the instantaneous power on the grid side. dc I is the DC bus voltage; d for Real-time shaft current value, I q for Real-time shaft current value.

[0010] In some embodiments, the target coefficient is calculated based on the instantaneous power on the grid side and the maximum power of the wind turbine, including: The target coefficient is calculated using the following formula: In the formula, K is the target coefficient; P is the motor speed coefficient. max This is the maximum power of the wind turbine.

[0011] In some embodiments, the q-axis current command is calculated based on the target coefficient and the DC bus voltage, including: The q-axis current command is calculated using the following formula: In the formula, W is the electric angular velocity of the motor, K is the target coefficient, and U dc This is the DC bus voltage.

[0012] In some embodiments, controlling the operation of an industrial fan according to the q-axis current command and the d-axis current command includes: The q-axis current error is calculated based on the q-axis current command and the real-time q-axis current. The d-axis current error is calculated based on the d-axis current command and the d-axis real-time current. Error adjustment is performed on the q-axis current error to obtain Given a given voltage for the d-axis, error adjustment is performed on the d-axis current error to obtain... Shaft-given voltage; According to the motor rotor angle, the Shaft given voltage and the Performing an inverse Park transform on the given axis voltage yields... Shaft given voltage, Shaft-based voltage; According to the above Shaft given voltage, the The given voltage is subjected to space vector pulse width modulation to generate an inverter drive signal, which is then sent to the drive board of the industrial fan to control the operation of the fan.

[0013] A second aspect of this invention discloses an industrial fan control device based on a thin-film capacitor, comprising: The first acquisition unit is used to acquire the real-time current values ​​of any two phases of the motor and determine the real-time current values ​​of the three phases of the motor based on the real-time current values ​​of any two phases of the motor. The first conversion unit is used to perform Clark transformation based on the real-time current values ​​of the three phases of the motor to obtain... Real-time shaft current value and Real-time shaft current value; The second transformation unit is used to acquire the motor rotor angle measured by the observer, and based on the motor rotor angle, the... Real-time shaft current value and the The real-time shaft current value is subjected to Park transformation to obtain... Real-time shaft current value and Real-time shaft current value; The second acquisition unit is used to acquire the DC bus voltage on the motor drive circuit of the industrial fan collected by the sensor; The first calculation unit is used to calculate based on the DC bus voltage and the... Real-time shaft current value and the Real-time shaft current value; calculate target coefficient. The second calculation unit is used to calculate the q-axis current command based on the target coefficient and the DC bus voltage. The determination unit is used to determine the d-axis current command; The control unit is used to control the operation of the industrial fan according to the q-axis current command and the d-axis current command.

[0014] In some embodiments, the first computing unit includes: The first calculation subunit is used to calculate based on the DC bus voltage, the... Real-time shaft current value and the Calculate the instantaneous grid-side power required by the motor based on the real-time shaft current value; The second calculation subunit is used to calculate the target coefficient based on the instantaneous power on the grid side and the maximum power of the wind turbine.

[0015] A third aspect of the present invention discloses an electronic device, including a memory storing executable program code and a processor coupled to the memory; the processor calls the executable program code stored in the memory to execute the industrial fan control method based on thin-film capacitors disclosed in the first aspect.

[0016] A fourth aspect of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the industrial fan control method based on thin-film capacitors disclosed in the first aspect.

[0017] Compared with the prior art, the beneficial effect of the present invention is that by obtaining the real-time current values ​​of the three phases of the motor and performing Clark and Park transformations, it obtains... Real-time shaft current value and The real-time shaft current value is then used to determine the DC bus voltage on the motor drive circuit of the industrial fan, as collected by the sensor. Real-time shaft current value and The system calculates the target coefficient based on the real-time axis current value, then calculates the q-axis current command based on the target coefficient and the DC bus voltage; next, it determines the d-axis current command; finally, it controls the operation of the industrial fan based on the q-axis and d-axis current commands, thus adaptively calculating the motor current based on the DC bus voltage in real time. Shaft current command, The q-axis current command is used as the control input for the current loop, causing the q-axis current to follow the fluctuations of the bus voltage, thereby reducing the range of bus voltage fluctuations. In other words, under the premise of ensuring stable system operation, the bus voltage is controlled smoothly, thereby reducing motor current distortion and torque pulsation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an industrial fan control circuit topology based on a thin-film capacitor, as disclosed in an embodiment of the present invention. Figure 2 This is a flowchart of an industrial fan control method based on thin-film capacitors disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an industrial fan control device based on a thin-film capacitor disclosed in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a computer device disclosed in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 301, First acquisition unit; 302, First transformation unit; 303, Second transformation unit; 304, Second acquisition unit; 305, First calculation unit; 306, Second calculation unit; 307, Determination unit; 308, Control unit; 401, Memory; 402, Processor. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] In some of the processes described in the specification, claims, and accompanying drawings of this invention, multiple operations appearing in a specific order are included. However, it should be clearly understood that these operations may not be executed in the order they appear herein, or may be executed in parallel. The operation numbers, such as 110, 120, etc., are merely used to distinguish different operations and do not themselves represent any execution order. Furthermore, these processes may include more or fewer operations, and these operations may be executed sequentially or in parallel. It should be noted that the descriptions such as "first," "second," etc., in this document are used to distinguish different messages, devices, modules, etc., and do not represent a sequential order, nor do they limit "first" and "second" to different types.

[0022] It will be understood by those skilled in the art that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0023] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] This invention discloses a circuit topology for using thin-film capacitors in industrial motor control, such as... Figure 1 As shown. Figure 1 Middle,U a U b U c These are the three-phase inputs of the three-phase power supply, L a L b L c These are inductors corresponding to the three-phase input, and diodes D1, D2, D3, D4, D5, and D6. Film capacitor C1 is connected to the bus and ground, and a resistor R is connected in parallel with film capacitor C1. When the fan is operating, the three-phase input current passes through the three inductors, then undergoes AC-DC conversion through the rectifier bridge formed by diodes D1, D2, D3, D4, D5, and D6, before being input to film capacitor C1. Film capacitor C1 acts as the bus capacitor. At this time, the bus voltage fluctuates significantly. The method disclosed in this invention can maintain the voltage of the bus capacitor in a steady state.

[0026] Please see Figure 2 This invention discloses an industrial fan control method based on thin-film capacitors. The execution subject of this method can be an electronic device such as a computer, laptop, or tablet, or an industrial fan control device based on thin-film capacitors embedded in an electronic device; this invention does not limit this. Figure 2 As shown, the industrial fan control method based on film capacitors includes the following steps 110-180: 110. Obtain the real-time current values ​​of any two phases of the motor, and determine the real-time current values ​​of the three phases of the motor based on the real-time current values ​​of any two phases of the motor.

[0027] During detection, only the real-time current values ​​of any two phases of the three-phase current need to be measured, and then the real-time current values ​​of the three phases can be calculated. According to Kirchhoff's laws, I can be obtained. a +I b +I c =0, therefore, the I of phases A and B can be collected by a current sensor. a and I b Then, the real-time current value I of phase C is calculated. c .

[0028] 120. Perform Clark transformation based on the real-time current values ​​of the three phases of the motor to obtain the real-time current values ​​of the α-axis and β-axis.

[0029] The Clark transformation is performed on the three-phase real-time current to obtain the α-axis real-time current value. β-axis real-time current value The specific formula for the Clark transform is shown in equation (1) below: (1) 130. Obtain the motor rotor angle measured by the observer, and perform Park transformation based on the motor rotor angle, the real-time current value of the α-axis, and the real-time current value of the β-axis to obtain the real-time current value of the d-axis. Real-time shaft current value.

[0030] Among them, the Park transformation of the three-phase real-time current is obtained. Real-time shaft current value I d and Real-time shaft current value I q The specific formula for the Park transformation is shown in equation (2) below: (2) Where θ is the motor rotor angle, used to characterize the motor rotor position.

[0031] 140. Obtain the DC bus voltage on the motor drive circuit of the industrial fan collected by the sensor.

[0032] 150. Based on the DC bus voltage, Real-time shaft current value and Calculate the target coefficient based on the real-time shaft current value.

[0033] Specifically, step 150 may include the following steps 1501-1502: 1501. Based on the DC bus voltage, Real-time shaft current value and The real-time shaft current value is used to calculate the instantaneous power required by the motor on the grid side.

[0034] The instantaneous grid-side power P required by the motor in The calculation formula is shown in equation (3) below: (3) In the formula, U dc This is the DC bus voltage.

[0035] 1502. Calculate the target coefficient based on the instantaneous power on the grid side and the maximum power of the wind turbine.

[0036] Specifically, the target coefficient K is calculated using the power balance equation, and the calculation formula is shown in equation (4) below: (4) In the formula, P is the motor speed coefficient. max This is the maximum power of the wind turbine.

[0037] 160. Calculate the q-axis current command based on the target coefficient and the DC bus voltage.

[0038] Specifically, based on the convergence analysis of the system equations, the system equations are discretized to obtain code, and the online calculation of the motor is achieved through the code. Shaft current command The calculation formula is shown in equation (5) below: (5) In the formula, W is the electric angular velocity of the motor, measured by the sliding diaphragm observer, and K is the target coefficient. for Shaft current command, The shaft current command is used as the control input for the current loop.

[0039] 170. Determine the d-axis current command.

[0040] Determine if a field weakening control requirement exists. If so, set the d-axis current command to be greater than the demagnetizing current and less than 0, i.e., I... t <I dref <0, where I t For demagnetizing current, I dref This is the d-axis current command.

[0041] If there is no need for field weakening control and the industrial fan is not a surface-mounted permanent magnet synchronous motor (SPMSM), then the d-axis current command is determined based on the maximum torque per unit current (MTPA).

[0042] If there is no need for field weakening control, and the industrial fan is a surface-mounted permanent magnet synchronous motor, the d-axis current command is set to 0.

[0043] For surface-mounted permanent magnet synchronous motors, because the permanent magnets are located on the rotor surface and the magnetic circuit structure is symmetrical, the inductances of the direct axis (d-axis) and quadrature axis (q-axis) are essentially equal, resulting in zero reluctance torque. The electromagnetic torque is generated solely by the q-axis current. In this case, the torque is entirely controlled by the q-axis current and is independent of the d-axis current. Therefore, to simplify the control structure, the d-axis current command can be set to 0.

[0044] 180. Control the operation of the industrial fan according to the q-axis current command and the d-axis current command.

[0045] Specifically, step 180 may include the following steps 1801-1805: 1801. Calculate the q-axis current error based on the q-axis current command and the real-time q-axis current.

[0046] Let k be the current sampling period, and k-1 be the previous sampling period, I q (k) represents the real-time q-axis current during the current sampling period, I qref (k) represents the q-axis current command for the current sampling period, and the q-axis current error for the current sampling period is expressed as: The q-axis current error of the previous sampling period is expressed as: .

[0047] 1802. Calculate the d-axis current error based on the d-axis current command and the real-time d-axis current.

[0048] Similarly, let I d (k) represents the real-time d-axis current during the current sampling period, I dref (k) represents the d-axis current command for the current sampling period, and the d-axis current error for the current sampling period is expressed as: The d-axis current error of the previous sampling period is expressed as: .

[0049] 1803. Error adjustment is performed on the q-axis current error to obtain... Given a given voltage on the d-axis, error adjustment is performed on the d-axis current error to obtain... Shaft given voltage.

[0050] Error regulation can be achieved using proportional-integral (PI) control. For example, if an incremental PI controller is used, the q-axis current control increment for the current sampling period is calculated based on the q-axis current error between the current sampling period and the previous sampling period. The formula is expressed as , where K i For integral gain, K p This is the proportional gain; then based on the previous sampling period... The given shaft voltage and the control increment of the current sampling period are used to calculate the current sampling period. Shaft given voltage The formula is expressed as .

[0051] Similarly, using incremental PI control, the d-axis current control increment for the current sampling period is first calculated based on the d-axis current error between the current sampling period and the previous sampling period. The formula is expressed as , where K i For integral gain, K p This is the proportional gain; then based on the previous sampling period... The given shaft voltage and the control increment of the current sampling period are used to calculate the current sampling period. Shaft given voltage The formula is expressed as .

[0052] 1804. Based on the motor rotor angle, Shaft given voltage and Performing an inverse Park transform on the given axis voltage yields... Shaft given voltage, Shaft given voltage.

[0053] Specifically, the formula for the inverse Park transform is shown in equation (6) below: (6) in, for Shaft given voltage, for Shaft given voltage.

[0054] 1805, according to Shaft given voltage, The given voltage is subjected to space vector pulse width modulation to generate an inverter drive signal, which is then sent to the drive board of the industrial fan to control the operation of the fan.

[0055] Specifically, Space Vector Pulse Width Modulation (SVPWM) is a modulation strategy for three-phase inverters. It aims to synthesize a rotating space voltage vector by controlling the inverter's switching states, thereby achieving efficient motor control. SVPWM generates inverter drive signals, which are pulse width modulation (PWM) signals. These PWM signals are used to control the inverter's switching states, thus synthesizing the desired output voltage vector. The frequency and duty cycle of the PWM signal determine the amplitude and frequency of the output voltage.

[0056] As can be seen, implementing the embodiments of the present invention can solve the problem of severe fluctuations in bus voltage due to a significant decrease in the energy storage capacity of the bus capacitor and the resulting drastic changes in grid power. Under the premise of ensuring stable system operation, it achieves smooth control of the bus voltage, thereby reducing motor current distortion and torque ripple. Furthermore, it can also solve the problem of coordinated control of machine-side and grid-side performance in thin-film capacitor drive systems, simultaneously achieving high power factor, low current harmonics, and high dynamic response performance on the machine side.

[0057] Compared with traditional control strategies, this embodiment of the invention can still operate normally even with extremely low bus capacitor values, and the rationality and correctness of the control have been demonstrated through MATLAB simulation.

[0058] In other possible embodiments, the PI controller can be replaced with a proportional-resonant (PR) controller, a proportional-integral-resonant (PIR) controller, or a sliding mode controller to further improve the tracking accuracy of specific frequency components. The three-phase rectifier bridge can be replaced with a single-phase rectifier bridge to accommodate different input power supply types. The diode rectifier bridge can be replaced with a pulse-width modulation (PWM) rectifier bridge to achieve bidirectional energy flow. The motor's electrical angular velocity detection can use an encoder solution instead of a sensorless control scheme to improve system stability.

[0059] like Figure 3 As shown, this embodiment of the invention also discloses an industrial fan control device based on thin-film capacitors, including a first acquisition unit 301, a first conversion unit 302, a second conversion unit 303, a second acquisition unit 304, a first calculation unit 305, a second calculation unit 306, a determination unit 307, and a control unit 308, wherein... The first acquisition unit 301 is used to acquire the real-time current values ​​of any two phases of the motor and determine the real-time current values ​​of the three phases of the motor based on the real-time current values ​​of any two phases of the motor. The first conversion unit 302 is used to perform Clark conversion based on the real-time current values ​​of the three phases of the motor to obtain... Real-time shaft current value and Real-time shaft current value; The second transformation unit 303 is used to acquire the motor rotor angle measured by the observer, and based on the motor rotor angle, Real-time shaft current value and The real-time shaft current value is subjected to Park transformation to obtain... Real-time shaft current value and Real-time shaft current value; The second acquisition unit 304 is used to acquire the DC bus voltage on the motor drive circuit of the industrial fan collected by the sensor. The first calculation unit 305 is used to calculate based on the DC bus voltage, Real-time shaft current value and Real-time shaft current value; calculate target coefficient. The second calculation unit 306 is used to calculate the q-axis current command based on the target coefficient and the DC bus voltage. Determining unit 307 is used to determine the d-axis current command; The control unit 308 is used to control the operation of the industrial fan according to the q-axis current command and the d-axis current command.

[0060] As an optional implementation, the first computing unit 305 includes the following sub-units (not shown): The first calculation subunit is used to calculate based on the DC bus voltage, Real-time shaft current value and Calculate the instantaneous grid-side power required by the motor based on the real-time shaft current value; The second calculation subunit is used to calculate the target coefficient based on the instantaneous power on the grid side and the maximum power of the wind turbine.

[0061] As an optional implementation, the control unit 308 includes the following sub-units (not shown): The error calculation subunit is used to calculate the q-axis current error based on the q-axis current command and the real-time q-axis current; and to calculate the d-axis current error based on the d-axis current command and the real-time d-axis current. The error adjustment subunit is used to adjust the q-axis current error. Given a given voltage on the d-axis, error adjustment is performed on the d-axis current error to obtain... Shaft-given voltage; and, based on the motor rotor angle, Shaft given voltage and Performing an inverse Park transform on the given axis voltage yields... Shaft given voltage, Shaft-based voltage; Modulation subunit, used according to Shaft given voltage, The given shaft voltage is subjected to space vector pulse width modulation to generate the inverter drive signal; The control subunit is used to send inverter drive signals to the drive board of the industrial fan to control the operation of the fan.

[0062] like Figure 4 As shown, this embodiment of the invention also discloses an electronic device, including a memory 401 storing executable program code and a processor 402 coupled to the memory 401; The processor 402 calls the executable program code stored in the memory 401 to execute the industrial fan control method based on thin-film capacitors described in the above embodiments.

[0063] like Figure 5As shown in the illustration, this invention also discloses a computer device. This computer device includes a processor, memory, network interface, display screen, and input device connected via a system bus. The processor in this computer design provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the computer device stores relevant data for an industrial fan control method based on film capacitors. The network interface of the computer device is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the industrial fan control method based on film capacitors described in the above embodiments.

[0064] This invention also discloses a computer-readable storage medium storing a computer program that causes a computer to execute the thin-film capacitor-based industrial fan control method described in the above embodiments. The storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc.

[0065] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The aforementioned storage medium can be a non-volatile storage medium such as a magnetic disk, optical disk, or read-only memory (ROM), or random access memory (RAM).

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for controlling an industrial fan based on a thin-film capacitor, characterized in that, include: Obtain the real-time current values ​​of any two phases of the motor, and determine the real-time current values ​​of the three phases of the motor based on the real-time current values ​​of any two phases of the motor. Clark transformation is performed on the real-time current values ​​of the three phases of the motor to obtain the real-time current values ​​of the α-axis and β-axis. Obtain the motor rotor angle measured by the observer, and based on the motor rotor angle, the... Real-time current value of shaft and the The real-time shaft current value is subjected to Park transformation to obtain... Real-time shaft current value and Real-time shaft current value; Acquire the DC bus voltage on the motor drive circuit of the industrial fan, as collected by the sensor; According to the DC bus voltage, the Real-time current value of shaft and the Real-time shaft current value; calculate target coefficient. The q-axis current command is calculated based on the target coefficient and the DC bus voltage. Determine the d-axis current command; The operation of the industrial fan is controlled according to the q-axis current command and the d-axis current command.

2. The industrial fan control method based on thin-film capacitors according to claim 1, characterized in that, According to the DC bus voltage, the Real-time current value of shaft and the Real-time shaft current value, calculation of target coefficients, including: According to the DC bus voltage, the Real-time current value of shaft and the Calculate the instantaneous grid-side power required by the motor based on the real-time shaft current value; The target coefficient is calculated based on the instantaneous power on the grid side and the maximum power of the wind turbine.

3. The industrial fan control method based on thin-film capacitors according to claim 2, characterized in that, According to the DC bus voltage, the Real-time current value of shaft and the The real-time shaft current value is used to calculate the instantaneous grid-side power required by the motor, including: The required instantaneous power on the grid side for the motor can be calculated using the following formula: In the formula, P in U represents the instantaneous power on the grid side. dc I is the DC bus voltage; d for Real-time shaft current value, I q for Real-time shaft current value.

4. The industrial fan control method based on thin-film capacitors according to claim 3, characterized in that, Based on the instantaneous power on the grid side and the maximum power of the wind turbine, the target coefficient is calculated, including: The target coefficient is calculated using the following formula: In the formula, K is the target coefficient; P is the motor speed coefficient. max This is the maximum power of the wind turbine.

5. The industrial fan control method based on thin-film capacitors according to claim 2, characterized in that, Based on the target coefficient and the DC bus voltage, the q-axis current command is calculated, including: The q-axis current command is calculated using the following formula: In the formula, W is the electric angular velocity of the motor, K is the target coefficient, and U dc This is the DC bus voltage.

6. The industrial fan control method based on thin-film capacitors according to any one of claims 1 to 5, characterized in that, Controlling the operation of the industrial fan according to the q-axis current command and the d-axis current command includes: The q-axis current error is calculated based on the q-axis current command and the real-time q-axis current. The d-axis current error is calculated based on the d-axis current command and the d-axis real-time current. Error adjustment is performed on the q-axis current error to obtain Given a given voltage for the d-axis, error adjustment is performed on the d-axis current error to obtain... Shaft-based voltage; According to the motor rotor angle, the Shaft given voltage and the Performing an inverse Park transform on the given axis voltage yields... Shaft given voltage, Shaft-based voltage; According to the above Shaft given voltage, the The given voltage is subjected to space vector pulse width modulation to generate an inverter drive signal, which is then sent to the drive board of the industrial fan to control the operation of the fan.

7. An industrial fan control device based on thin-film capacitors, characterized in that, include: The first acquisition unit is used to acquire the real-time current values ​​of any two phases of the motor and determine the real-time current values ​​of the three phases of the motor based on the real-time current values ​​of any two phases of the motor. The first conversion unit is used to perform Clark transformation based on the real-time current values ​​of the three phases of the motor to obtain... Real-time shaft current value and Real-time shaft current value; The second transformation unit is used to acquire the motor rotor angle measured by the observer, and based on the motor rotor angle, the... Real-time current value of shaft and the The real-time shaft current value is subjected to Park transformation to obtain... Real-time shaft current value and Real-time shaft current value; The second acquisition unit is used to acquire the DC bus voltage on the motor drive circuit of the industrial fan collected by the sensor; The first calculation unit is used to calculate based on the DC bus voltage and the... Real-time current value of shaft and the Real-time shaft current value; calculate target coefficient. The second calculation unit is used to calculate the q-axis current command based on the target coefficient and the DC bus voltage. The determination unit is used to determine the d-axis current command; The control unit is used to control the operation of the industrial fan according to the q-axis current command and the d-axis current command.

8. The industrial fan control device based on thin-film capacitors according to claim 7, characterized in that, The first computing unit includes: The first calculation subunit is used to calculate based on the DC bus voltage, the... Real-time current value of shaft and the Calculate the instantaneous grid-side power required by the motor based on the real-time shaft current value; The second calculation subunit is used to calculate the target coefficient based on the instantaneous power on the grid side and the maximum power of the wind turbine.

9. An electronic device, characterized in that, It includes a memory storing executable program code and a processor coupled to the memory; the processor calls the executable program code stored in the memory to execute the industrial fan control method based on thin-film capacitors as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program causes a computer to perform the industrial fan control method based on thin-film capacitors as described in any one of claims 1 to 6.

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