Fan starting control method, device, equipment and medium

Abstract

The application relates to the technical field of intelligent household appliances, and particularly provides a fan starting control method, a fan starting control device, a fan starting control equipment and a medium, which aims to solve the technical problem of fan starting failure. To this end, the fan starting control method comprises the following steps: obtaining a rotating state, a target rotating speed and a target rotating direction of a fan; wherein the rotating state comprises a current rotating speed and a current rotating direction; determining a starting mode according to the current rotating direction and the target rotating direction; wherein the starting mode comprises headwind starting and tailwind starting; if it is determined that the starting mode is headwind starting, then zero-current control is performed until the target rotating speed is greater than or equal to the current rotating speed; headwind speed closed-loop control is performed; if it is determined that the starting mode is tailwind starting, then zero-vector brake control is performed when it is determined that the current rotating speed is less than a safety rotating speed; starting control and tailwind speed closed-loop control are performed when it is determined that the current rotating speed is 0.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent household appliances, and specifically provides a fan starting control method, device, equipment and medium. BACKGROUND

[0002] Currently, household appliances such as air conditioners, fans, air purifiers, etc. usually have a fan, which is usually composed of an impeller, a bracket, a motor and the like. The motor in the fan drives the impeller to rotate under the drive of electricity. In the running process of the fan, after the fan is powered off, the impeller drives the motor to rotate in the original rotation direction due to inertia, and it may also drive the motor to rotate due to external wind blowing the impeller. In the above two cases, the fan needs to start in the wind or against the wind.

[0003] In the prior art, when starting in the wind, direct closed-loop control causes the bus voltage to rise, and when starting against the wind, direct braking causes the current to be too large or the bus voltage to be too high, causing damage to the fan, and further leading to the technical problem of failure of the fan to start.

[0004] Correspondingly, there is a need in the art for a new fan starting control method to solve the above problems. SUMMARY

[0005] In order to overcome the above defects, the present application is proposed to provide a solution or at least partially solve the technical problem in the prior art that when starting in the wind, direct closed-loop control causes the bus voltage to rise, and when starting against the wind, direct braking causes the current to be too large or the bus voltage to be too high, causing damage to the fan, and further leading to the technical problem of failure of the fan to start.

[0006] In a first aspect, the present application provides a fan starting control method, comprising:

[0007] obtaining a rotation state, a target speed and a target rotation direction of the fan; wherein the rotation state comprises a current speed and a current rotation direction;

[0008] determining a starting mode according to the current rotation direction and the target rotation direction; wherein the starting mode comprises starting in the wind and starting against the wind;

[0009] if it is determined that the starting mode is starting in the wind, performing zero current control until the target speed is greater than or equal to the current speed;

[0010] performing wind speed closed-loop control;

[0011] if it is determined that the starting mode is starting against the wind, performing zero vector brake control when it is determined that the current speed is less than a safety speed;

[0012] performing starting control and wind speed closed-loop control when it is determined that the current speed is 0.

[0013] In one of the technical solutions of the fan starting control method, the obtaining of the rotating state of the fan comprises:

[0014] Setting the q-axis reference current, the d-axis reference current and the rotor position initial value of the fan to 0;

[0015] Obtaining the q-axis voltage, the d-axis voltage and the phase current of the fan;

[0016] Obtaining the rotating state according to the q-axis voltage, the d-axis voltage and the phase current.

[0017] In one of the technical solutions of the fan starting control method, the obtaining of the safe rotating speed comprises:

[0018] Obtaining the demagnetization current of the motor and the rated current of the power device;

[0019] Obtaining the safe current according to the demagnetization current and the rated current;

[0020] Obtaining the safe rotating speed according to the safe current, the inductance of the motor, the resistance of the motor and the back electromotive force coefficient of the motor.

[0021] In one of the technical solutions of the fan starting control method, the performing of the zero vector brake control comprises:

[0022] Controlling the short circuit connection of the three-phase bridge arm of the motor;

[0023] Obtaining the back electromotive force of the motor, the resistance of the motor and the inductance of the motor;

[0024] Obtaining the damping current according to the back electromotive force of the motor, the resistance of the motor and the inductance of the motor;

[0025] Reducing the current rotating speed of the fan according to the damping current.

[0026] In one of the technical solutions of the fan starting control method, if it is determined that the starting mode is the adverse wind starting, the method further comprises:

[0027] If it is determined that the current rotating speed is greater than the safe rotating speed, obtaining the rotating state of the fan.

[0028] In one of the technical solutions of the fan starting control method, the obtaining of the rotating state according to the q-axis voltage, the d-axis voltage and the phase current comprises:

[0029] Performing the Park inverse transformation on the q-axis voltage and the d-axis voltage to obtain a transformed voltage;

[0030] The phase current is subjected to a Clarke transformation to obtain a transformed current;

[0031] A rotation state is obtained according to the transformed voltage and the transformed current.

[0032] In one of the technical solutions of the fan starting control method, the downwind speed closed-loop control comprises:

[0033] The real-time rotation speed of the fan is monitored.

[0034] According to the real-time rotation speed and the target rotation speed, the operation parameter of the fan is adjusted.

[0035] In a second aspect, the application provides a fan starting device, comprising:

[0036] An acquisition module is configured to acquire a rotation state, a target rotation speed and a target rotation direction of a fan, wherein the rotation state comprises a current rotation speed and a current rotation direction.

[0037] A determination module is configured to determine a starting mode according to the current rotation direction and the target rotation direction, wherein the starting mode comprises downwind starting and upwind starting.

[0038] A control module is configured to perform zero current control until the target rotation speed is greater than or equal to the current rotation speed if the starting mode is determined to be downwind starting.

[0039] The control module is further configured to perform downwind speed closed-loop control.

[0040] The control module is further configured to perform zero vector brake control if the starting mode is determined to be upwind starting and the current rotation speed is determined to be less than a safety rotation speed.

[0041] The control module is further configured to perform starting control and upwind speed closed-loop control if the current rotation speed is determined to be 0.

[0042] In a third aspect, the application provides a fan starting device, comprising at least one processor and a memory; wherein,

[0043] The memory stores computer execution instructions.

[0044] The at least one processor executes the computer execution instructions stored in the memory, so that the at least one processor executes the method in any one of the first aspect.

[0045] In a fourth aspect, the application provides a computer readable storage medium, wherein a plurality of program codes are stored, the program codes are suitable for being loaded and run by a processor to execute the method in any one of the first aspect.

[0046] The application provides a fan starting control method, device, equipment and medium, and the method specifically comprises the following steps: obtaining the rotating state, target rotating speed and target rotating direction of a fan; wherein the rotating state comprises a current rotating speed and a current rotating direction; determining a starting mode according to the current rotating direction and the target rotating direction; wherein the starting mode comprises a downwind starting and an upwind starting; if it is determined that the starting mode is the downwind starting, performing zero current control until the target rotating speed is greater than or equal to the current rotating speed; performing downwind speed closed-loop control; if it is determined that the starting mode is the upwind starting, performing zero vector brake control when it is determined that the current rotating speed is less than a safety rotating speed; performing starting control and upwind speed closed-loop control when it is determined that the current rotating speed is 0, so as to ensure normal starting of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0047] The disclosure of the application will become more apparent with reference to the drawings. It is easy for those skilled in the art to understand that the drawings are only for the purpose of illustration, and are not intended to constitute a limitation on the scope of protection of the application. In addition, similar numbers in the drawings are used to represent similar components, wherein:

[0048] Figure 1 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0049] Figure 2 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0050] Figure 3 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0051] Figure 4 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0052] Figure 5 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0053] Figure 6 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0054] Figure 7 is a flowchart of a fan starting control method provided by an embodiment of the application;

[0055] Figure 8 is a structural schematic diagram of a fan starting device provided by an embodiment of the application;

[0056] Figure 9A structural schematic diagram of a fan starting device provided by an embodiment of the present application is shown in the figure.

[0057] Figure 10 A fan starting control data flow diagram provided by an embodiment of the present application is shown in the figure.

[0058] Figure 11 A three-phase inverter motor drive topology schematic diagram provided by an embodiment of the present application is shown in the figure.

[0059] Figure 12 A motor drive schematic diagram of a shorted phase line provided by an embodiment of the present application is shown in the figure.

[0060] Figure 13 A flow schematic diagram of a fan downwind starting control method embodiment one provided by an embodiment of the present application is shown in the figure.

[0061] Figure 14 A flow schematic diagram of a fan upwind starting control method embodiment one provided by an embodiment of the present application is shown in the figure.

[0062] A list of reference signs is shown in the figure.

[0063] 11: acquisition module; 12: determination module; 13: control module; 21: processor; 22: memory. DETAILED DESCRIPTION

[0064] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0065] In the description of the present application, "module" and "processor" can include hardware, software or a combination of both. A module can include hardware circuit, various suitable sensors, communication port, memory, and can also include software part such as program code, and can be a combination of software and hardware. The processor can be a central processor, microprocessor, image processor, digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor can be implemented in software, hardware or a combination of both. The non-transitory computer readable storage medium includes any suitable medium that can store program code, such as magnetic disk, hard disk, optical disk, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or both A and B. The term "at least one of A or B" or "at least one of A and B" has similar meaning as "A and / or B", and can include only A, only B or both A and B. The singular form of the term "one", "this" can also include plural forms.

[0066] Currently, the fan drives the motor to rotate under the condition that the fan is not driven by power. During the rotation of the motor, if the motor needs to be started, two starting modes, i.e., downwind starting and upwind starting, appear. In the prior art, direct closed-loop control during downwind starting is prone to cause the bus voltage to rise, and during upwind starting, direct braking of the motor during high-speed rotation causes the current to be too large or the bus voltage to be too large, which all result in the technical problem of damage to the fan.

[0067] Based on this, in order to solve the above technical problems, the technical concept of the present application is to provide a new fan starting control method to realize normal starting of the fan.

[0068] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0069] Figure 1 is a flowchart of a fan starting control method embodiment one provided by the present application. As shown in Figure 1 , specifically, the method comprises:

[0070] Step S101: Obtain the rotation state, target speed and target rotation direction of the fan.

[0071] In this embodiment, the rotation state includes the current speed and the current rotation direction.

[0072] In this embodiment, when the rotation state of the fan is obtained, the control current is 0, no current is generated in the bus, and thus no voltage is generated in the bus.

[0073] Step S102: Determine the starting mode according to the current rotation direction and the target rotation direction.

[0074] In this embodiment, the starting mode includes downwind starting and upwind starting.

[0075] In this embodiment, if the rotation direction of the current fan is consistent with the target rotation direction, the starting mode is downwind starting; if the rotation direction of the current fan is different from the target rotation direction, the starting mode is upwind starting.

[0076] Step S103: If it is determined that the starting mode is downwind starting, execute zero-current control until the target speed is greater than or equal to the current speed.

[0077] In the embodiment, it is determined that the wind is started in the downwind mode, zero current control is performed, that is, the reference current of the q-axis of the fan, the reference current of the d-axis and the initial position of the observer rotor are all 0, the zero current control is repeatedly performed until the target rotating speed is greater than or equal to the current rotating speed.

[0078] Step S104: downwind speed closed loop control is performed.

[0079] In the embodiment, it is determined that the target rotating speed is less than the current rotating speed, the downwind speed closed loop control is performed, no sudden change of the current occurs, and smooth starting is realized.

[0080] Step S105: if it is determined that the starting mode is the upwind starting mode, zero vector brake control is performed when it is determined that the current rotating speed is less than the safe rotating speed.

[0081] In the embodiment, in order to avoid that the fan cannot be stopped when the upwind starting mode is started, the zero vector brake control is used when the current rotating speed is less than the safe rotating speed, and the fan is stopped.

[0082] Step S106: starting control and upwind speed closed loop control are performed when it is determined that the current rotating speed is 0.

[0083] In the embodiment, starting control is performed when it is determined that the current rotating speed is 0, that is, the fan is stopped, the fan is started, and upwind speed closed loop control is performed, so that the fan is stably operated.

[0084] In the embodiment, if it is determined that the current rotating speed is not 0, torque brake control is performed, and then starting control and upwind speed closed loop control are performed. The torque brake control is that reverse current is applied to the d-axis and the q-axis. According to formula 1:

[0085] (1)

[0086] The reverse current I is obtained, wherein K e is the back electromotive force coefficient, and ω is the current rotating speed.

[0087] In this embodiment, the rotational state, target speed, and target rotational direction of the wind turbine are acquired; wherein, the rotational state includes the current speed and current rotational direction; based on the current rotational direction and the target rotational direction, a start-up mode is determined; wherein, the start-up mode includes downwind start-up and upwind start-up; if the start-up mode is determined to be downwind start-up, zero-current control is executed until the target speed is greater than or equal to the current speed; downwind speed closed-loop control is executed; if the start-up mode is determined to be upwind start-up, zero-vector braking control is executed when the current speed is determined to be less than the safe speed; when the current speed is determined to be 0, start-up control and upwind speed closed-loop control are executed. Compared to existing technologies where excessive bus voltage during wind turbine startup leads to startup failure, this application first determines the startup mode based on the current rotation direction and the target rotation direction. If the startup mode is downwind startup, zero-current control is executed until the target speed is greater than or equal to the current speed, and then downwind speed closed-loop control is executed. If the startup mode is downwind startup, zero-vector braking control is executed when the current speed is determined to be less than the safe speed, and startup control and upwind speed closed-loop control are executed when the current speed is determined to be 0, thereby ensuring normal wind turbine startup.

[0088] Figure 2 This is a flowchart illustrating a second embodiment of a wind turbine start-up control method provided in this application. Based on the above embodiments, as follows... Figure 2 As shown, specifically, in step S101, one way to obtain the rotation state of the fan is as follows:

[0089] Step S201: Set the q-axis reference current, d-axis reference current, and initial rotor position of the fan to 0.

[0090] Step S202: Obtain the q-axis voltage, d-axis voltage, and phase current of the fan.

[0091] In this embodiment, Figure 10 This is a data flow diagram of the wind turbine start-up control provided in the embodiments of this application, from Figure 10 As can be seen from the diagram, when acquiring the fan's rotational state, switch SW1 is set to position A, meaning both the q-axis and d-axis reference currents are 0. Therefore, the q-axis and d-axis reference currents are input to the current PI controller to obtain the voltage V. dq V dq The voltage V is obtained by the inverse Parker transform. αβ V αβ The voltage V is obtained by inverse Clarke transform. uv Then the voltage V uv Pulse width modulation (PWM) is performed to obtain a modulated voltage. This modulated voltage is then input to an inverter to obtain a converted voltage, which is then input to the motor. The motor current I... uv Through the Clarke transform, we obtain Iαβ V αβ and I αβ are input to the observer to obtain the angle θ and the current speed I αβ and the angle θ are transformed by the Park transformation to obtain I dq , and I dq is input to the current PI control. The switch SW1 is placed in the B position, the current speed and the reference speed are input to the speed PI control to obtain the q-axis reference current and the d-axis reference current, and then the q-axis reference current and the d-axis reference current are input to the current PI control to obtain the voltage V dq , V dq is transformed by the Park inverse transformation to obtain the voltage V αβ , V αβ is transformed by the Clarke inverse transformation to obtain the voltage V uv , and then the voltage V uv is pulse width modulated to obtain the modulated voltage, and then the modulated voltage is input to the inverter to obtain the converted voltage, and then the converted voltage is input to the motor, and the current I uv of the motor is transformed by the Clarke transformation to obtain I αβ , V αβ and I αβ are input to the observer to obtain the angle θ and the current speed I αβ and the angle θ are transformed by the Park transformation to obtain I dq , and I dq is input to the current PI control. Wherein, I αβ includes the voltage I α and the voltage I β , I uv includes the current I u of the u phase and the current I v of the v phase, V αβ includes the voltage V α and the voltage V β , V uv includes the voltage V u and the voltage V v , I dq includes the current I d and the current I q .

[0092] Step S203: obtaining the rotation state according to the q-axis voltage, the d-axis voltage and the phase current.

[0093] In the embodiment, the q-axis voltage, the d-axis voltage and the phase current are input to the observer, the observer observes the rotation speed and the position of the rotor to obtain the rotation state.

[0094] In the embodiment, the q-axis reference current, the d-axis reference current and the rotor position initial value of the fan are all set to 0; the q-axis voltage, the d-axis voltage and the phase current of the fan are obtained; and the rotating state is obtained according to the q-axis voltage, the d-axis voltage and the phase current.

[0095] Figure 3 is a flowchart of a fan starting control method provided by an embodiment of the present application. Based on the above embodiment, as shown in Figure 3 , specifically, the safe rotating speed in the obtaining step S105 comprises:

[0096] Step S301: obtaining the demagnetizing current of the motor and the rated current of the power device.

[0097] In the embodiment, Figure 11 is a three-phase inverter motor drive topology diagram provided by an embodiment of the present application. After short-circuiting the lower bridge arm in Figure 11 , that is, short-circuiting s a - , s b - , s c - , respectively, the diode of the lower bridge arm is short-circuited, and since the upper bridge arm is in an open state, finally Figure 11 only the three-phase circuit of the motor, and the three-phase circuit inside the motor is a motor drive diagram of the short-circuited phase line in Figure 12 , wherein each phase of the motor is composed of a resistor and a capacitor in series, and when the motor rotates, the three phases of the motor all generate induced voltage.

[0098] In the embodiment, the mathematical model of the short-circuited phase line motor drive is:

[0099] (2)

[0100] In formula 2, V is the voltage generated due to the back electromotive force when the motor rotates, K e is the back electromotive force coefficient, ω is the current rotating speed, L is the inductance of the motor, R is the resistance of the motor, i is the current of the motor, and t is time.

[0101] Step S302: obtaining the safe current according to the demagnetizing current and the rated current.

[0102] In the embodiment, the safe current is the maximum value between the demagnetizing current and the rated current.

[0103] Step S303: obtaining the safe rotating speed according to the safe current, the inductance of the motor, the resistance of the motor and the back electromotive force coefficient of the motor.

[0104] According to formula 3:

[0105]

[0106] get the safe rotating speed ω safe , wherein I max is the safe current, Z = jωL + R, K e is the back electromotive force coefficient, L is the inductance of the motor, ω is the current rotating speed, and R is the resistance of the motor.

[0107] In this embodiment, the demagnetizing current of the motor and the rated current of the power device are obtained; the safe current is obtained according to the demagnetizing current and the rated current; and the safe rotating speed is obtained according to the safe current, the inductance of the motor, the resistance of the motor, and the back electromotive force coefficient of the motor.

[0108] Figure 4 is a flowchart of a fourth embodiment of a fan starting control method provided by the application. Based on the above embodiments, as shown in Figure 4 , specifically, the execution of the zero vector brake control in step S105 includes:

[0109] Step S401: Control the short circuit connection of the three-phase bridge arm of the motor.

[0110] In this embodiment, the three-phase bridge arm includes a three-phase upper bridge arm and a three-phase lower bridge arm. In Figure 11 , the three-phase upper bridge arm s a + , s b + , s c + is short-circuited, that is, the three-phase upper bridge arm is connected to VDC.

[0111] In this embodiment, the three-phase lower bridge arm can also be controlled to be short-circuited, that is, the three-phase lower bridge arm s a - , s b - , s c - is short-circuited.

[0112] Step S402: Obtain the back electromotive force of the motor, the resistance of the motor, and the inductance of the motor.

[0113] Step S403: Obtain the damping current according to the back electromotive force of the motor, the resistance of the motor, and the inductance of the motor.

[0114] In this embodiment, the back electromotive force, the resistance, and the inductance of the motor are used to generate the damping current, which can reduce the rotating speed of the motor or stop the motor.

[0115] Step S404: Reduce the current rotating speed of the fan according to the damping current.

[0116] In the embodiment, the damping current acts on the motor, and the current rotating speed of the fan can be reduced.

[0117] In the embodiment, the three-phase bridge arm of the motor is short-circuited, the counter electromotive force of the motor, the resistance of the motor and the inductance of the motor are obtained, the damping current is obtained according to the counter electromotive force of the motor, the resistance of the motor and the inductance of the motor, and the current rotating speed of the fan is reduced according to the damping current, so that the rotating speed of the motor is quickly reduced.

[0118] Figure 5 FIG. 5 is a flowchart of a fan starting control method according to an embodiment of the present application. As shown in FIG. 5, the method comprises the following steps. Figure 5 Specifically, in step S105, if it is determined that the starting mode is the adverse wind starting, the method further comprises the following steps.

[0119] In step S501, if it is determined that the current rotating speed is greater than the safe rotating speed, the rotating state of the fan is obtained.

[0120] In the embodiment, when the adverse wind starting, the fan needs to be stopped first and then started, if the rotating speed is too high, that is, the current rotating speed is greater than the safe rotating speed, at this time, the brake current generated by the brake is too large, which can damage the motor or the power device, therefore, the rotating state of the fan needs to be obtained to determine whether the fan is less than the safe rotating speed.

[0121] In the embodiment, the rotating state, the target rotating speed and the target rotating direction of the fan are obtained, the rotating state comprises the current rotating speed and the current rotating direction, the starting mode is determined according to the current rotating direction and the target rotating direction, the starting mode comprises the favorable wind starting and the adverse wind starting, if it is determined that the starting mode is the favorable wind starting, the zero current control is executed until the target rotating speed is greater than or equal to the current rotating speed, the favorable wind speed closed loop control is executed, if it is determined that the starting mode is the adverse wind starting, if it is determined that the current rotating speed is greater than the safe rotating speed, the rotating state of the fan is obtained, when it is determined that the current rotating speed is 0, the starting control and the adverse wind speed closed loop control are executed, so that the fan is not damaged when the adverse wind starting.

[0122] Figure 6 FIG. 6 is a flowchart of a fan starting control method according to an embodiment of the present application. As shown in FIG. 6, the method comprises the following steps. Figure 6 Specifically, the specific implementation of step S203 comprises the following steps.

[0123] In step S601, the q-axis voltage and the d-axis voltage are subjected to Park inverse transformation to obtain a transformed voltage.

[0124] In the embodiment, the q-axis voltage and the d-axis voltage are subjected to Park inverse transformation respectively to obtain a transformed voltage.

[0125] Step S602: Perform Clarke transformation on the phase currents to obtain transformed currents.

[0126] In this embodiment, the phase current of the u phase and the phase current of the v phase are respectively subjected to Clarke transformation to obtain transformed currents.

[0127] Step S603: Obtain the rotating state according to the transformed voltage and the transformed current.

[0128] In this embodiment, the transformed voltage and the transformed current are input to the flux observer, and the flux observer obtains the rotating state of the fan by observing the rotating speed and the rotor position.

[0129] In this embodiment, the q-axis voltage and the d-axis voltage are subjected to Park inverse transformation to obtain the transformed voltage; the phase currents are subjected to Clarke transformation to obtain the transformed currents; and the rotating state is obtained according to the transformed voltage and the transformed current.

[0130] Figure 7 FIG. 7 is a flowchart of a fan starting control method according to an embodiment of the present application, and FIG. 8 is a flowchart of a fan downwind starting control method according to an embodiment of the present application. Figure 7 As shown in FIG. 7, the fan starting control method according to the embodiment of the present application comprises the following steps.

[0131] Step S701: Monitor the real-time rotating speed of the fan.

[0132] Step S702: Adjust the operating parameters of the fan according to the real-time rotating speed and the target rotating speed.

[0133] In this embodiment, when the fan rotates downwind, the operating parameters of the fan are not fixed and are changed in real time. Specifically, the real-time rotating speed of the fan monitored in real time is fed back to the control system of the fan, and the control system of the fan adjusts the operating parameters such as the current and the voltage of the fan according to the difference between the real-time rotating speed and the target rotating speed.

[0134] In this embodiment, the real-time rotating speed of the fan is monitored, and the operating parameters of the fan are adjusted according to the real-time rotating speed and the target rotating speed, thereby realizing the downwind starting of the fan.

[0135] Figure 13 FIG. 7 is a flowchart of a fan starting control method according to an embodiment of the present application, and FIG. 8 is a flowchart of a fan downwind starting control method according to an embodiment of the present application. Figure 13 As shown in FIG. 7, the fan starting control method according to the embodiment of the present application comprises the following steps.

[0136] Step S801: Obtain the rotating state, the target rotating speed and the target rotating direction of the fan.

[0137] In this embodiment, the rotating state comprises the current rotating speed and the current rotating direction.

[0138] Step S802: determining the starting mode according to the current rotating direction and the target rotating direction.

[0139] In this embodiment, the starting mode includes wind-aided starting and against-the-wind starting.

[0140] Step S803: if it is determined that the starting mode is wind-aided starting, performing zero-current control until the target rotating speed is greater than or equal to the current rotating speed.

[0141] Step S804: performing wind-aided speed closed-loop control.

[0142] In this embodiment, the rotating state, the target rotating speed and the target rotating direction of the fan are acquired; the starting mode is determined according to the current rotating direction and the target rotating direction; if it is determined that the starting mode is wind-aided starting, zero-current control is performed until the target rotating speed is greater than or equal to the current rotating speed; and wind-aided speed closed-loop control is performed to realize wind-aided starting.

[0143] Figure 14 is a flowchart of an embodiment of a wind fan against-the-wind starting control method provided by the present application, as shown in Figure 14 , comprising:

[0144] Step S901: acquiring the rotating state, the target rotating speed and the target rotating direction of the fan.

[0145] In this embodiment, the rotating state includes the current rotating speed and the current rotating direction.

[0146] Step S902: determining the starting mode according to the current rotating direction and the target rotating direction.

[0147] In this embodiment, the starting mode includes wind-aided starting and against-the-wind starting.

[0148] Step S903: if it is determined that the starting mode is against-the-wind starting, determining whether the current rotating speed is less than the safe rotating speed, if not, performing step S904, and if yes, performing step S905.

[0149] Step S904: acquiring the rotating state of the fan.

[0150] Step S905: performing zero-vector brake control.

[0151] Step S906: acquiring the rotating state of the fan.

[0152] Step S907: determining whether the current rotating speed is 0, if not, performing step S908, and if yes, performing step S909.

[0153] Step S908: performing torque brake control.

[0154] Step S909: performing starting control.

[0155] Step S910: performing reverse wind speed closed loop control.

[0156] In the embodiment, the rotating state, the target rotating speed and the target rotating direction of the fan are acquired; the starting mode is determined according to the current rotating direction and the target rotating direction; if it is determined that the starting mode is reverse wind starting, it is judged whether the current rotating speed is less than the safe rotating speed, if not, the rotating state of the fan is acquired; if yes, zero vector brake control is performed; the rotating state of the fan is acquired; it is judged whether the current rotating speed is 0, if not, torque brake control is performed; if yes, starting control is performed; reverse wind speed closed loop control is performed to realize reverse wind starting.

[0157] It should be noted that, although the steps in the above embodiments are described in a specific order, those skilled in the art can understand that, in order to achieve the effects of the present application, the different steps do not necessarily have to be executed in such an order, they can be executed simultaneously (in parallel) or in other orders, and these changes are within the protection scope of the present application.

[0158] Further, the present application also provides a fan starting device.

[0159] Figure 8 is a structural schematic diagram of a fan starting device provided by the embodiment of the present application. As shown in Figure 8 the fan starting device in the embodiment of the present application mainly includes an acquisition module 11, a determination module 12 and a control module 13. In some embodiments, one or more of the acquisition module 11, the determination module 12 and the control module 13 can be combined together to become one module. In some embodiments, the acquisition module 11 can be configured to acquire the rotating state, the target rotating speed and the target rotating direction of the fan; wherein the rotating state includes the current rotating speed and the current rotating direction. The determination module 12 can be configured to determine the starting mode according to the current rotating direction and the target rotating direction; wherein the starting mode includes forward wind starting and reverse wind starting. The control module 13 can be configured to perform zero current control if it is determined that the starting mode is forward wind starting, until the target rotating speed is greater than or equal to the current rotating speed. The control module 13 can also be configured to perform forward wind speed closed loop control. The control module 13 can also be configured to perform zero vector brake control if it is determined that the starting mode is reverse wind starting, when it is determined that the current rotating speed is less than the safe rotating speed. The control module 13 can also be configured to perform starting control and reverse wind speed closed loop control when it is determined that the current rotating speed is 0.

[0160] The above fan starting device is used to perform Figures 1 to 7The technical principles, the solved technical problems and the generated technical effects of the two embodiments of the fan starting control method are similar, and the person skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the fan starting device and the related description can refer to the content described in the embodiments of the fan starting control method, and will not be repeated here.

[0161] It can be understood by the person skilled in the art that all or part of the processes in the method of the above-mentioned embodiment can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the processor executes the computer program, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms, etc. The computer readable storage medium can include any entity or device, medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0162] Further, the application also provides a fan starting device.

[0163] Figure 9 is a structural schematic diagram of a fan starting device provided by the embodiment of the application. As Figure 9 shown, in an embodiment of the fan starting device according to the application, the fan starting device includes a processor 21 and a memory 22. The memory 22 can be configured to store a program for executing the fan starting control method of the above-mentioned method embodiment. The processor 21 can be configured to execute the program in the storage device, which includes but is not limited to the program for executing the fan starting control method of the above-mentioned method embodiment. For the convenience of description, only the parts related to the embodiments of the application are shown, and the specific technical details not disclosed are referred to the method part of the embodiments of the application. The fan starting device can be a control device formed by various electronic devices.

[0164] Further, the present application also provides a computer readable storage medium. In an embodiment of the computer readable storage medium according to the present application, the computer readable storage medium can be configured to store a program for implementing the fan start control method of the above-mentioned method embodiments, which can be loaded and run by the processor to implement the above-mentioned fan start control method. For the convenience of illustration, only the parts related to the embodiments of the present application are shown, and the specific technical details not disclosed are referred to the method part of the embodiments of the present application. The computer readable storage medium can be a storage device formed by various electronic devices, and optionally, the computer readable storage medium in the embodiments of the present application is a non-transitory computer readable storage medium.

[0165] Further, it should be understood that, since the setting of each module is only for illustrating the functional units of the device of the present application, the corresponding physical device of the module can be the processor itself, or a part of the software, a part of the hardware, or a part of the combination of the software and the hardware in the processor. Therefore, the number of each module in the figure is only illustrative.

[0166] Those skilled in the art can understand that each module in the device can be adaptively split or combined. Such splitting or combining of the specific module will not cause the technical solution to deviate from the principles of the present application, therefore, the technical solution after splitting or combining will fall within the protection scope of the present application.

[0167] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the present application, and the technical solution after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A fan start-up control method, characterized in that, include: The rotational state, target rotational speed, and target rotational direction of the fan are obtained; wherein, the rotational state includes the current rotational speed and the current rotational direction; The starting mode is determined based on the current rotation direction and the target rotation direction; wherein, the starting mode includes tailwind start and headwind start; If the starting mode is determined to be a tailwind start, then zero-current control is executed until the target speed is greater than or equal to the current speed; Implement tailwind speed closed-loop control; If the starting mode is determined to be a headwind start, then when the current speed is determined to be less than the safe speed, zero-vector braking control is executed; When the current rotational speed is determined to be 0, start-up control and headwind speed closed-loop control are executed. Obtaining the safe rotation speed includes: Obtain the demagnetizing current of the motor and the rated current of the power devices; The safe current is obtained based on the demagnetizing current and the rated current; The safe speed is obtained based on the safe current, the inductance of the motor, the resistance of the motor, and the back electromotive force coefficient of the motor.

2. The method according to claim 1, characterized in that, The acquisition of the fan's rotation state includes: Set the q-axis reference current, d-axis reference current, and initial rotor position of the fan to 0. Obtain the q-axis voltage, d-axis voltage, and phase current of the fan; The rotational state is obtained based on the q-axis voltage, the d-axis voltage, and the phase current.

3. The method according to claim 1, characterized in that, The execution of zero-vector braking control includes: The three-phase bridge arm controlling the motor is short-circuited; Obtain the back electromotive force, resistance, and inductance of the motor; The damping current is obtained based on the back electromotive force of the motor, the resistance of the motor, and the inductance of the motor. Based on the damping current, the current speed of the fan is reduced.

4. The method according to claim 1, characterized in that, If it is determined that the startup mode is a reverse startup, the method further includes: If it is determined that the current rotational speed is greater than the safe rotational speed, then the rotational state of the fan is obtained.

5. The method according to claim 2, characterized in that, The process of obtaining the rotational state based on the q-axis voltage, d-axis voltage, and phase current includes: Perform an inverse Parker transformation on the q-axis voltage and the d-axis voltage to obtain the transformed voltage; The phase current is subjected to Clark transformation to obtain the transformed current; The rotation state is obtained based on the transformed voltage and the transformed current.

6. The method according to claim 1, characterized in that, The tailwind speed closed-loop control includes: Monitor the real-time speed of the fan; The operating parameters of the fan are adjusted based on the real-time rotational speed and the target rotational speed.

7. A fan starting device, characterized in that, include: The acquisition module is used to acquire the rotation state, target speed, and target rotation direction of the fan; wherein, the rotation state includes the current speed and the current rotation direction; The determining module is used to determine the starting mode based on the current rotation direction and the target rotation direction; wherein the starting mode includes tailwind start and headwind start; The control module is used to perform zero-current control if it is determined that the starting mode is a tailwind start, until the target speed is greater than or equal to the current speed; The control module is also used to perform closed-loop control of the tailwind speed; The control module is also configured to perform zero-vector braking control if it is determined that the starting mode is a headwind start and the current speed is less than the safe speed. The control module is also used to execute start-up control and headwind speed closed-loop control when the current rotational speed is determined to be 0. Obtaining the safe rotation speed includes: Obtain the demagnetizing current of the motor and the rated current of the power devices; The safe current is obtained based on the demagnetizing current and the rated current; The safe speed is obtained based on the safe current, the inductance of the motor, the resistance of the motor, and the back electromotive force coefficient of the motor.

8. A wind turbine starting device, comprising at least one processor and a memory; wherein, The memory stores computer-executed instructions; The at least one processor executes computer execution instructions stored in the memory, causing the at least one processor to perform the method of any one of claims 1 to 6.

9. A computer-readable storage medium storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the method of any one of claims 1 to 6.

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