CN112943671A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN112943671A CN112943671A CN202110390009.8A CN202110390009A CN112943671A CN 112943671 A CN112943671 A CN 112943671A CN 202110390009 A CN202110390009 A CN 202110390009A CN 112943671 A CN112943671 A CN 112943671A
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- fan
- axis
- spd
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- air conditioning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to an air conditioner, the air conditioner injects the reactive component in the d-axis before the blower starts, the direction of d-axis is the corresponding direction of the N pole of the rotor of the electrical machine, inject the reactive component in the d-axis and increase the current and will not influence the rotation state of the rotor of the electrical machine, therefore, will not influence the rotation state of the blower in the natural wind state, the invention is through injecting the reactive component in the d-axis, withdraw the current signal under the static coordinate system, calculate and obtain the rotational speed and rotor position of the blower, and then confirm the direct and against the wind state of the blower, choose the appropriate start strategy for subsequent blower starts, the invention does not need to increase the hardware, can realize this kind of function only through the software, can reduce the hardware cost, reduce the complexity of the hardware cloth, improve.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner device with a fan starting control strategy.
Background
In the application of a non-inductive direct current fan, a traditional method is used for a positioning, open-loop and closed-loop starting mode (suitable for a low-power and small-blade fan), particularly when a high-power and large-blade fan has strong forward and backward wind energy, the failure probability is increased by adopting the traditional method, because the moment given by positioning can not resist the forward and backward wind capacity when the forward and backward wind is large, and if the braking, positioning, open-loop and closed-loop starting mode is adopted, large braking current can be generated in the braking stage to damage an inverter switching tube.
In order to deal with the situation, the forward and backward wind speed and the rotor position can be indirectly acquired by detecting the back electromotive force through an external terminal voltage detection circuit, and a motor terminal voltage sampling circuit is added in a hardware circuit to judge the forward and backward wind capability before starting, so that different starting strategies are selected.
Disclosure of Invention
The invention provides an air conditioning device, which solves the technical problems of complex circuit and low hardware reliability caused by the fact that a hardware circuit is additionally arranged to judge the wind power of the forward wind and the reverse wind before the starting of a fan in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air conditioning device, includes air condensing units, air condensing units includes the fan, and air conditioning device still includes:
the reactive component injection module is used for injecting reactive components into a d axis to generate a current instruction Id before the fan is started, and no reactive component is injected into a q axis;
the three-phase winding current acquisition module is used for acquiring three-phase winding currents ia, ib and ic of the fan in a static coordinate system when the reactive component injection module injects the reactive component into a d axis;
the Clarke transformation module is used for transforming the three-phase winding currents ia, ib and ic of the fan into alpha-axis and beta-axis current components i alpha and i beta under a static coordinate system;
the Park conversion module is used for converting the current components i alpha and i beta into a d-axis current feedback value Id;
the current inner loop is used for adjusting the difference value between the current command Id and the d-axis current feedback value Id to obtain a d-axis voltage command Vd;
the Park inverse transformation module is used for transforming the d-axis voltage command Vd into alpha-axis and beta-axis voltage components V alpha and V beta under a static coordinate system;
the driving signal generating module is used for generating driving signals from the voltage components V alpha and V beta to drive the fan to work;
the speed estimation module is used for calculating a rotor angle theta of the fan according to the voltage components V alpha and V beta and the current components i alpha and i beta;
the control module is used for obtaining the rotor angular speed omega e of the fan according to the rotor angle theta of the fan, determining the state of the fan according to the rotor angular speed omega e of the fan, and determining the starting strategy of the fan according to the state of the fan.
Compared with the prior art, the technical scheme of the invention has the following technical effects: the invention relates to an air conditioning device, which injects a reactive component into a d axis before a fan is started, the direction of the d axis is the direction corresponding to the N pole of a motor rotor, and the injection of the reactive component into the d axis increases the current without influencing the rotating state of the motor rotor, so that the rotating state of the fan in a natural wind state is not influenced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating selection of a starting strategy of a fan of an air conditioning device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of coordinate system transformation according to an embodiment of the present invention.
Fig. 3 is a control schematic block diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
An air conditioning device comprises an air conditioning outdoor unit, wherein the air conditioning outdoor unit comprises a fan, the fan of the air conditioning outdoor unit is positioned outdoors and can rotate in the state of natural wind frequently, at the moment, if a transmission starting method that the fan is in a static state is adopted, the failure possibility is high, because the forward and reverse wind can not be resisted by the moment given by positioning when the forward and reverse wind is high, and if a braking, positioning, open-loop and closed-loop starting mode is adopted, a braking stage can generate large braking current to damage an inverter switch tube. Therefore, the direct and inverse wind state of the fan is obtained before the fan is started, and the starting strategy of the fan is determined according to the direct and inverse wind state, so that the method has an important effect on the successful starting of the fan. The present embodiment focuses on the determination of the state of the wind turbine by software based on the existing hardware, and before the wind turbine is started, the state of the wind turbine, such as a static state, a downwind state, an upwind state, etc., is determined, and the degree of the state is further estimated, so as to select different starting strategies based on the determination. The determination of the fan state is explained by the following specific example.
As shown in fig. 2 and 3, the air conditioner includes:
and the reactive component injection module is used for injecting a reactive component into a d axis before the fan is started to generate a current instruction Id, and not injecting a reactive component into a q axis. It can be seen from fig. 2 that the direction of the d-axis is the direction corresponding to the N pole of the rotor, and the rotating state of the N pole is not affected by simply increasing the current from the direction of the d-axis in physical view.
And the three-phase winding current acquisition module is used for acquiring three-phase winding currents ia, ib and ic of the fan in a static coordinate system when the reactive component injection module injects the reactive component into the d axis. The three-phase winding current acquisition module samples single resistance or double resistances in the existing hardware.
And the Clarke transformation module is used for transforming the three-phase winding currents ia, ib and ic of the fan into alpha-axis and beta-axis current components i alpha and i beta under a static coordinate system.
In the Clarke transformation block,
and the Park conversion module is used for converting the current components i alpha and i beta into a d-axis current feedback value Id.
And the current inner ring is used for adjusting the difference value between the current command Id and the d-axis current feedback value Id to obtain a d-axis voltage command Vd.
And the Park inverse transformation module is used for transforming the d-axis voltage command Vd into alpha-axis and beta-axis voltage components V alpha and V beta under a static coordinate system.
In the inverse Park transform module,
where Vq is 0 and θ represents the rotor angle.
And the driving signal generation module is used for generating driving signals from the voltage components V alpha and V beta to drive the fan to work.
The driving signal generation module is an SVPWM module, the voltage components V alpha and V beta are modulated by the SVPWM module to generate 6 paths of driving signals to drive the inverter to work, the motor of the fan is indirectly driven to work, and at the moment, the working current of the motor is d-axis reactive component current.
And the speed estimation module is used for calculating the rotor angle theta of the fan according to the voltage components V alpha and V beta and the current components i alpha and i beta.
The basic formula of the speed estimation module satisfies a static coordinate system, an alpha beta axis voltage equation:
wherein:
to obtain:
further, it is obtained that:
wherein Rs represents the phase internal resistance value, Ls represents the phase inductance average value, ke represents the back electromotive force coefficient, ω e represents the angular velocity, and e α and e β represent the α -axis and β -axis back electromotive force voltages, respectively.
Of course, the speed estimation module is not limited to the above voltage equation, and it is within the scope of the present invention to implement the speed estimation module based on the voltage components V α and V β and the current components i α and i β,
and the rotor angle of the fan calculated by the speed estimation module is output to the Park transformation module and the Park inverse transformation module.
The control module is used for obtaining the rotor angular speed omega e of the fan according to the rotor angle theta of the fan, determining the state of the fan according to the rotor angular speed omega e of the fan, and determining the starting strategy of the fan according to the state of the fan.
The control module is used for controlling the fan to be positioned and started in an open loop mode when the spd _ min _1 is not less than omega e and not more than spd _ min _ 2; the control device is used for controlling the open-loop speed reduction reverse start of the fan when spd _ max _1< omegae < spd _ min _ 1; and the control unit is used for controlling the closed-loop starting of the fan when the spd _ min _2< omegae < spd _ max _2, wherein the spd _ min _1 and the spd _ max _1 are negative values, and the spd _ min _2 and the spd _ max _2 are positive values.
The control module is used for controlling the fan not to be started when the omega e is larger than or equal to spd _ max _2 and the omega e is smaller than or equal to spd _ max _ 1.
The control module is used for monitoring the omega e in real time when the omega e is not less than spd _ max _2 and not more than spd _ max _1, and controlling the fan to start according to a starting strategy corresponding to the starting condition when the omega e meets the starting condition.
The parameters spd _ min _1, spd _ max _1, spd _ min _2, and spd _ min _2 need to be determined according to an actual test environment.
In particular, as shown in figure 1,
1. the fan is in a static state
At the moment, the fan is in a static state, a low downwind state and a low upwind state, the influence of external force on the fan is small, the speed of the fan is calculated by adopting a method of injecting reactive components into a d axis, the actual speed meets spd _ min _1 and is not more than omega e spd _ min _2, and the traditional starting method is suitable for being adopted under the working condition: the positioning open loop starts.
2. Normal upwind condition
At the moment, the fan is in a normal upwind state, external force has certain counterforce on the fan to cause the fan to rotate reversely, the speed of the fan is calculated by adopting a method of injecting reactive components into a d axis, the actual speed meets spd _ max _1< omega e < spd _ min _1, and the method of open-loop speed reduction reverse starting is suitable for being adopted under the working condition.
3. Normal downwind state
At the moment, the fan is in a normal downwind state, external force has certain positive acting force on the fan to cause the fan to rotate clockwise, the speed of the fan is calculated by adopting a method of injecting reactive components into a d axis, the actual speed meets spd _ min _2< omega e < spd _ max _2, and the method of direct closed-loop starting is suitable for being adopted under the working condition.
4. Ultra-high upwind state
At the moment, when the fan is in an ultrahigh upwind state, the fan is violently reversed due to the fact that external force has super-strong reaction force on the fan, the speed of the fan is calculated by adopting a method of injecting reactive components into a d axis, the actual speed meets the condition that omega e is not more than or equal to spd _ max _1, the fan is not recommended to be started under the working condition and is monitored in real time, and when the external force is reduced and meets one of conditions 1, 2 and 3, a corresponding starting strategy is used for starting the fan.
5. Ultra-high upwind state
At the moment, when the fan is in an ultrahigh downwind state, the fan is subjected to ultrahigh positive acting force by external force, so that the fan rotates violently forwards, the speed of the fan is calculated by adopting a method of injecting reactive components into a d axis, the actual speed meets the condition that omega e is more than or equal to spd _ max _2, the fan is not recommended to be started under the working condition and is monitored in real time, and when the external force is reduced and meets one of 1, 2 and 3, a corresponding starting strategy is entered for starting the fan.
According to the method and the device, the direct-wind and upwind states of the fan can be accurately determined on the basis of not increasing hardware, so that a proper fan starting strategy is selected, and the fan can be normally started.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An air conditioning apparatus includes an air conditioning outdoor unit including a blower, characterized by comprising:
the reactive component injection module is used for injecting reactive components into a d axis to generate a current instruction Id before the fan is started, and no reactive component is injected into a q axis;
the three-phase winding current acquisition module is used for acquiring three-phase winding currents ia, ib and ic of the fan in a static coordinate system when the reactive component injection module injects the reactive component into a d axis;
the Clarke transformation module is used for transforming the three-phase winding currents ia, ib and ic of the fan into alpha-axis and beta-axis current components i alpha and i beta under a static coordinate system;
the Park conversion module is used for converting the current components i alpha and i beta into a d-axis current feedback value Id;
the current inner loop is used for adjusting the difference value between the current command Id and the d-axis current feedback value Id to obtain a d-axis voltage command Vd;
the Park inverse transformation module is used for transforming the d-axis voltage command Vd into alpha-axis and beta-axis voltage components V alpha and V beta under a static coordinate system;
the driving signal generating module is used for generating driving signals from the voltage components V alpha and V beta to drive the fan to work;
the speed estimation module is used for calculating a rotor angle theta of the fan according to the voltage components V alpha and V beta and the current components i alpha and i beta;
the control module is used for obtaining the rotor angular speed omega e of the fan according to the rotor angle theta of the fan, determining the state of the fan according to the rotor angular speed omega e of the fan, and determining the starting strategy of the fan according to the state of the fan.
2. The air conditioning apparatus according to claim 1, wherein, in the Park inverse transform module,
wherein Vq is 0.
3. Air conditioning unit according to claim 1, characterized in that, in the Clarke transformation module,
4. air conditioning unit according to claim 1, characterized in that in the speed estimation module
Wherein:
to obtain:
wherein Rs represents the phase internal resistance value, Ls represents the phase inductance average value, ke represents the back electromotive force coefficient, ω e represents the angular velocity, and e α and e β represent the α -axis and β -axis back electromotive force voltages, respectively.
5. The air conditioning apparatus of claim 1, wherein the three-phase winding current acquisition module samples by single resistance or double resistance.
6. The air conditioning apparatus of claim 1, wherein the rotor angle of the fan calculated by the speed estimation module is output to the Park transformation module and the Park inverse transformation module.
7. The air conditioner apparatus according to claim 1, wherein the driving signal generating module is an SVPWM module.
8. The air conditioning device according to any one of claims 1 to 7, wherein the control module is configured to control the fan positioning open loop start when spd _ min _1 ≦ ω e ≦ spd _ min _ 2; the fan open-loop speed reduction reverse starting control device is used for controlling the fan open-loop speed reduction reverse starting when spd _ max _1< omegae < spd _ min _ 1; and the fan closed loop starting control module is used for controlling the fan closed loop starting when the spd _ min _2< omegae < spd _ max _2, wherein the spd _ min _1 and the spd _ max _1 are negative values, and the spd _ min _2 and the spd _ max _2 are positive values.
9. The air conditioning device according to claim 8, wherein the control module is configured to control the blower not to be started when ω e ≧ spd _ max _2 and ω e ≦ spd _ max _ 1.
10. The air conditioning device according to claim 9, wherein the control module is configured to monitor ω e in real time when ω e is greater than or equal to spd _ max _2 and ω e is less than or equal to spd _ max _1, and control the fan to start according to a start strategy corresponding to the start condition when ω e meets the start condition.
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