CN111200385B - Control method of compressor - Google Patents
Control method of compressor Download PDFInfo
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- CN111200385B CN111200385B CN202010110651.1A CN202010110651A CN111200385B CN 111200385 B CN111200385 B CN 111200385B CN 202010110651 A CN202010110651 A CN 202010110651A CN 111200385 B CN111200385 B CN 111200385B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/07—Speed loop, i.e. comparison of the motor speed with a speed reference
Abstract
The application provides a control method of a compressor, which comprises the steps of firstly obtaining the actual current of the compressor, and determining a first output voltage based on the actual current and the specified current of the compressor; then acquiring a power grid voltage, determining a second output voltage based on the first output voltage and the power grid voltage, and outputting the second output voltage to the compressor; secondly, comparing the first output voltage with the second output voltage to obtain a voltage difference value; and finally, determining a current change value based on the voltage difference value and a first set proportion coefficient, and adjusting the specified current according to the current change value to realize the control of the actual current. By adopting the method, when the power grid voltage is abnormal, the rotating speed of the compressor is prevented from suddenly dropping or suddenly rising, and the running stability of the compressor is improved, so that the working power grid quality range of the air conditioning unit is expanded, and the demand of regions with poor power quality is met.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a control method of a compressor.
Background
In recent years, with the continuous progress of social development, the demands of consumers on living quality are continuously increased, and the demands of household air conditioners are increasingly increased. In a household air conditioner or the like, the voltage provided by the power grid is generally processed and then supplied to the load. The load comprises a compressor, a system internal switching power supply and the like, wherein the compressor is a main load, and the output power of the compressor accounts for more than 95% of the total input power at rated output.
Along with the popularization of the application range of the air conditioner, the requirements of partial remote areas are increased, and the quality of a power grid cannot be guaranteed. And when the problem that the power grid voltage drops for a short time or even disappears occurs, the rotating speed of the compressor in the air conditioner can drop rapidly. Meanwhile, when the voltage of the power grid is rapidly recovered, the rotating speed of the compressor in the air conditioner is also rapidly increased. That is, when the grid voltage is abnormal, the rotation speed of the compressor is suddenly reduced or suddenly increased, which causes a problem of poor stability.
Disclosure of Invention
In view of the above, it is necessary to provide a method for controlling a compressor, which is directed to a problem that the rotational speed of the compressor suddenly drops or rises when the grid voltage is abnormal, and the stability is poor.
A control method of a compressor, comprising:
acquiring an actual current of a compressor, and determining a first output voltage based on the actual current and a specified current of the compressor;
acquiring a power grid voltage, determining a second output voltage based on the first output voltage and the power grid voltage, and outputting the second output voltage to the compressor;
comparing the first output voltage with the second output voltage to obtain a voltage difference value;
and determining a current change value based on the voltage difference value and a first set proportionality coefficient, and adjusting the specified current according to the current change value to realize the control of the actual current.
In one embodiment, the step of obtaining an actual current of the compressor and determining the first output voltage based on the actual current and a specified current of the compressor comprises:
acquiring the actual current and the specified current of the compressor, and subtracting the actual current and the specified current to obtain a first difference result;
and performing PI regulation on the first difference result to obtain the first output voltage.
In one embodiment, the step of obtaining a grid voltage, determining a second output voltage based on the first output voltage and the grid voltage, and outputting the second output voltage to the compressor comprises:
acquiring the power grid voltage, and comparing the power grid voltage with the first output voltage to obtain a first comparison result;
if the first comparison result is that the first output voltage is greater than the power grid voltage, determining that the second output voltage is the power grid voltage, and outputting the power grid voltage to the compressor at the moment;
and if the first comparison result shows that the first output voltage is less than or equal to the power grid voltage, determining that the second output voltage is the first output voltage, and outputting the first output voltage to the compressor.
In one embodiment, the step of determining a current variation value based on the voltage difference value and a first set scaling factor, and adjusting the specified current according to the current variation value to realize the control of the actual current comprises:
filtering the voltage difference value to obtain the filtered voltage difference value;
acquiring the first set proportion coefficient, and multiplying the first set proportion coefficient by the filtered voltage difference value to obtain the current change value;
and adjusting the specified current based on the current change value to realize the control of the actual current.
In one embodiment, the first set proportionality coefficient Kc1Comprises the following steps:
Kp1＝Lωc；
wherein, Δ imaxIs the maximum current saturation difference, Δ u, of the compressormaxIs the maximum voltage saturation difference of the compressor, L is the inductance parameter of the compressor, ωcIs the bandwidth of the motor in the compressor.
In one embodiment, after the step of obtaining an actual current of the compressor and determining the first output voltage based on the actual current and a specified current of the compressor, the method further comprises:
acquiring the actual rotating speed of the compressor, and determining a first output current based on the actual rotating speed and the set rotating speed of the compressor;
determining a second output current based on the first output current and the specified current, and outputting the second output current to the compressor;
comparing the first output current with the second output current to obtain a current difference value;
and determining a rotating speed change value based on the current difference value and a second set proportion coefficient, and adjusting the set rotating speed according to the rotating speed change value to realize the control of the actual rotating speed.
In one embodiment, the step of obtaining an actual speed of the compressor and determining a first output current based on the actual speed and a set speed of the compressor comprises:
acquiring the actual rotating speed and the set rotating speed of the compressor, and making a difference between the actual rotating speed and the set rotating speed to obtain a second difference result;
and performing PI regulation on the second difference result to obtain the first output current.
In one embodiment, the step of determining a second output current based on the first output current and the specified current, and outputting the second output current to the compressor comprises:
comparing the first output current with the specified current to obtain a second comparison result;
if the second comparison result is that the first output current is larger than the specified current, determining that the second output current is the specified current, and outputting the specified current to the compressor;
and if the second comparison result shows that the first output current is less than or equal to the specified current, determining that the second output current is the first output current, and outputting the first output current to the compressor.
In one embodiment, the step of determining a rotation speed variation value based on the current difference value and a second set proportionality coefficient, and adjusting the set rotation speed according to the rotation speed variation value to realize the control of the actual rotation speed comprises:
filtering the current difference value to obtain the filtered current difference value;
acquiring the second set proportion coefficient, and multiplying the first set proportion coefficient by the filtered current difference value to obtain the rotating speed change value;
and adjusting the set rotating speed based on the rotating speed change value so as to realize the control of the actual rotating speed.
In one embodiment, the second set proportionality coefficient Kc2Comprises the following steps:
Kp2＝2ξJmωn；
wherein, Δ nmaxIs the maximum speed drop, Δ i, of the compressormaxIs the maximum current saturation difference of the compressor, xi is the damping coefficient, ωnIs the resonant frequency, JmIs the moment of inertia of the rotor within the compressor.
In one embodiment, after the steps of determining a rotation speed variation value based on the current difference value and a second set proportionality coefficient, and adjusting the set rotation speed according to the rotation speed variation value to realize the control of the actual rotation speed, the method further comprises:
judging whether the rotating speed change value is larger than a preset rotating speed value or not;
if the rotating speed change value is larger than the preset rotating speed value, timing is started, and whether the current timing time is larger than a preset time threshold value or not is determined;
if the current timing time is determined to be greater than the preset time threshold, determining that the power grid voltage falls or rises, and recording the frequency of the power grid voltage change;
and determining whether the power grid voltage is abnormal or not based on the power grid voltage change times and preset times.
In one embodiment, the step of determining whether the grid voltage is abnormal based on the grid voltage change times and the preset times includes:
comparing the voltage change times with preset times, and if the voltage change times are greater than the preset times, determining that the power grid voltage is abnormal;
and if the voltage change times are less than or equal to the preset times, determining that the power grid voltage is normal.
Compared with the prior art, the control method of the compressor comprises the steps of firstly obtaining the actual current of the compressor, and determining the first output voltage based on the actual current and the specified current of the compressor; then acquiring a power grid voltage, determining a second output voltage based on the first output voltage and the power grid voltage, and outputting the second output voltage to the compressor; secondly, comparing the first output voltage with the second output voltage to obtain a voltage difference value; and finally, determining a current change value based on the voltage difference value and a first set proportion coefficient, and adjusting the specified current according to the current change value to realize the control of the actual current. By adopting the method, when the power grid voltage is abnormal, the rotating speed of the compressor is prevented from suddenly dropping or suddenly rising, and the running stability of the compressor is improved, so that the working power grid quality range of the air conditioning unit is expanded, and the demand of regions with poor power quality is met.
Drawings
Fig. 1 is a flowchart illustrating a control method of a compressor according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a desaturation current loop PI regulator according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a control method of a compressor according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a desaturation rpm ring PI regulator according to an embodiment of the present disclosure;
fig. 5 is a comparison graph of the rotating speed variation when the grid voltage suddenly changes in a step manner according to an embodiment of the present application;
fig. 6 is a flowchart for determining whether a grid voltage is abnormal according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, an embodiment of the present application provides a method for controlling a compressor, including:
s102: an actual current of a compressor is obtained, and a first output voltage is determined based on the actual current and a specified current of the compressor.
In one embodiment, an actual current of the compressor may be obtained by a controller or processor and the first output voltage is determined based on the actual current and a specified current of the compressor. In one embodiment, the controller or processor may obtain the actual current of the compressor through a current transformer. In one embodiment, the controller or processor may also obtain the actual current of the compressor through a current sensor.
In one embodiment, after the controller or the processor obtains the actual current, the actual current may be subtracted from the specified current of the compressor to obtain a difference current. The controller or processor may then perform PI control of the difference current (the particular PI control may be controlled in a conventional manner) so that the first output voltage may be determined. In one embodiment, the specified current of the compressor refers to: and the set current of the compressor when leaving the factory.
S104: obtaining a grid voltage, determining a second output voltage based on the first output voltage and the grid voltage, and outputting the second output voltage to the compressor.
In one embodiment, a grid voltage may be obtained by the controller or processor, a second output voltage may be determined based on the first output voltage and the grid voltage, and the second output voltage may be output to the compressor. In one embodiment, the controller or processor may obtain the grid voltage through a voltage transformer. In one embodiment, the controller or processor may also obtain the grid voltage through a voltage acquisition circuit. Specifically, the voltage acquisition circuit may adopt a conventional circuit topology having a voltage acquisition function.
In one embodiment, after the controller or the processor obtains the grid voltage (i.e., the bus voltage), the first output voltage may be compared with the grid voltage to obtain a voltage comparison result. And if the voltage comparison result shows that the first output voltage is less than or equal to the power grid voltage, determining that the second output voltage is the first output voltage at the moment, namely that the output voltage is not saturated at the moment. And if the voltage comparison result shows that the first output voltage is greater than the power grid voltage, determining that the second output voltage is the power grid voltage at the moment, namely that the output voltage is saturated at the moment. After the output voltage is saturated, step S106 is performed.
S106: and comparing the first output voltage with the second output voltage to obtain a voltage difference value.
In one embodiment, the first output voltage may be compared to the second output voltage by the controller or processor to obtain a voltage difference. Specifically, when the output voltage is not saturated, the first output voltage is equal to the second output voltage, and the voltage difference is zero. When the output voltage is saturated and the first output voltage and the second output voltage are not equal, the voltage difference is not zero. That is, the specified current can be adjusted according to the voltage difference value, so as to control the actual current.
S108: and determining a current change value based on the voltage difference value and a first set proportionality coefficient, and adjusting the specified current according to the current change value to realize the control of the actual current.
In one embodiment, the controller or the processor may determine a current variation value based on the voltage difference value and a first set scaling factor, and adjust the specified current according to the current variation value to achieve control of the actual current. Specifically, the controller or the processor may perform low-pass filtering on the voltage difference value to obtain the filtered voltage difference value. And then multiplying the filtered voltage difference value by the first set proportion coefficient to obtain the current change value. At this time, the specified current can be adjusted according to the current change value so as to realize the control of the actual current. Specifically, the adjusted specified current can be obtained by subtracting the preset current from the current variation value, so that the actual current can be controlled (i.e., the desaturation adjustment of the compressor current loop is completed).
In one embodiment, the first set scaling factor Kc1This can be obtained by the following equation:
Kp1＝Lωc；
wherein, Δ imaxIs that said compressor is maximumCurrent saturation difference, Δ umaxIs the maximum voltage saturation difference of the compressor, L is the inductance parameter of the compressor, ωcIs the bandwidth of the motor in the compressor.
In one embodiment, as can be seen from the above formula, after the output voltage is saturated, the current variation value can be determined according to the voltage difference value and the first set scaling factor, and the specified current is adjusted based on the current variation value, so that the first output voltage is consistent with the second output voltage, thereby implementing control over the actual current and improving the stability of the operation of the compressor.
In this embodiment, by using the above method, when the power grid voltage is abnormal (such as drop or rise), the rotation speed of the compressor is prevented from suddenly dropping or suddenly rising, and the stability of the operation of the compressor is improved, so that the quality range of the working power grid of the air conditioning unit is expanded, and the demand of the area with poor power quality is met.
In one embodiment, the step of obtaining an actual current of the compressor and determining the first output voltage based on the actual current and a specified current of the compressor comprises: acquiring the actual current and the specified current of the compressor, and subtracting the actual current and the specified current to obtain a first difference result; and performing PI regulation on the first difference result to obtain the first output voltage.
In one embodiment, the first difference result may be PI adjusted by the controller or the processor, and a specific adjustment process is shown in fig. 2. The specific formula is as follows:
Kp1＝Lωc
Ki1＝Rωc
wherein: l is an inductance parameter of the compressor, R is a resistance parameter of the compressor, ωcThe bandwidth of the motor in the compressor is 1000-2000. ByThe above formula can determine the specific value of each parameter in the PI adjustment process, so that the controller or the processor can calculate the specific value of the first output voltage based on the first difference result, thereby facilitating subsequent processing.
In one embodiment, the steps of obtaining a grid voltage, determining a second output voltage based on the first output voltage and the grid voltage, and outputting the second output voltage to the compressor include: and obtaining the power grid voltage, and comparing the power grid voltage with the first output voltage to obtain a first comparison result. And if the first comparison result shows that the first output voltage is greater than the power grid voltage, determining that the second output voltage is the power grid voltage, and outputting the power grid voltage to the compressor at the moment. And if the first comparison result shows that the first output voltage is less than or equal to the power grid voltage, determining that the second output voltage is the first output voltage, and outputting the first output voltage to the compressor.
In one embodiment, the controller or the processor may perform a difference comparison between the grid voltage and the first output voltage, and obtain a difference comparison result (i.e., the first comparison result). And if the first comparison result shows that the first output voltage is greater than the power grid voltage, determining that the second output voltage is the power grid voltage at the moment, and the output voltage is saturated at the moment. That is, the voltage output to the compressor at this time is the grid voltage. That is to say, at this time, the specified current needs to be adjusted, so that the first output voltage is adjusted, the first output voltage is smaller than or equal to the grid voltage, and the actual current of the compressor is controlled.
And if the first comparison result is that the first output voltage is less than or equal to the power grid voltage, determining that the second output voltage is the first output voltage at the moment, and the output voltage is not saturated at the moment. That is, the voltage output to the compressor is the first output voltage, that is, the specified current does not need to be adjusted. By the adjusting mode, the phenomenon that the rotating speed of the compressor suddenly drops or rises due to the fact that the voltage of the power grid is abnormal can be avoided, and therefore the stability and the reliability of the operation of the compressor are improved.
In one embodiment, the step of determining a current variation value based on the voltage difference value and a first set scaling factor, and adjusting the specified current according to the current variation value to realize the control of the actual current comprises: and filtering the voltage difference value to obtain the filtered voltage difference value. And acquiring the first set proportion coefficient, and multiplying the first set proportion coefficient by the filtered voltage difference value to obtain the current change value. And adjusting the specified current based on the current change value to realize the control of the actual current.
In one embodiment, the controller or the processor may filter the voltage difference value after obtaining the voltage difference value. Specifically, the voltage difference may be subjected to low-pass filtering processing. In one embodiment, the voltage difference value may be filtered by a low-pass filter, and the filtered voltage difference value is obtained. So that the controller or processor determines the current change value based on the filtered voltage difference value and the first set scaling factor, and then adjusts the specified current based on the current change value to realize the control of the actual current.
Referring to fig. 3 and 4, in one embodiment, after the step of obtaining the actual current of the compressor and determining the first output voltage based on the actual current and the specified current of the compressor, the method further comprises:
s202: the method comprises the steps of obtaining the actual rotating speed of the compressor, and determining a first output current based on the actual rotating speed and the set rotating speed of the compressor.
In one embodiment, an actual speed of the compressor may be obtained by a controller or processor and the first output current may be determined based on the actual speed and a set speed of the compressor. In one embodiment, the controller or processor may obtain an actual rotational speed of the compressor through a rotational speed detection sensor.
In one embodiment, after the controller or the processor obtains the actual rotation speed, the controller or the processor may obtain a rotation speed difference by subtracting the actual rotation speed from a set rotation speed of the compressor. The controller or processor may then perform PI control of the speed differential (the particular PI control may be controlled in a conventional manner) to determine the first output current. In one embodiment, the set rotation speed of the compressor is: a set current of the compressor. In one embodiment, the set speed of the compressor may be initially set according to actual demand.
S204: determining a second output current based on the first output current and the specified current, and outputting the second output current to the compressor.
In one embodiment, a second output current may be determined by the controller or processor based on the first output current and the specified current and output to the compressor. In one embodiment, the controller or processor may compare the first output current and the specified current to obtain a current comparison result. And if the current comparison result shows that the first output current is smaller than or equal to the specified current, determining that the second output current is the first output current at the moment, namely the output current is not saturated at the moment. And if the current comparison result shows that the first output current voltage is greater than the power grid voltage, determining that the second output current is the specified current at the moment, namely that the output current is saturated at the moment. After the output current is saturated, step S206 is performed.
S206: and comparing the first output current with the second output current to obtain a current difference value.
In one embodiment, the first output current may be compared to the second output current by the controller or processor to obtain a current difference. Specifically, when the output current is not saturated, the first output current and the second output current are equal, and the current difference is zero. When the output current is saturated and the first output current and the second output current are not equal, the current difference is not zero. Namely, the set rotating speed can be adjusted according to the current difference value so as to realize the control of the actual rotating speed.
S208: and determining a rotating speed change value based on the current difference value and a second set proportion coefficient, and adjusting the set rotating speed according to the rotating speed change value to realize the control of the actual rotating speed.
In one embodiment, the controller or the processor may determine a rotation speed variation value based on the current difference value and a second set scaling factor, and adjust the set rotation speed according to the rotation speed variation value to control the actual rotation speed. Specifically, the controller or the processor may perform low-pass filtering on the current difference value to obtain the filtered current difference value. And then multiplying the filtered current difference value by the second set proportion coefficient to obtain the rotating speed change value. At this time, the set rotating speed can be adjusted according to the rotating speed change value so as to realize the control of the actual rotating speed. Specifically, the set rotating speed after adjustment can be obtained by subtracting the preset rotating speed from the rotating speed change value, so that the actual rotating speed can be controlled (namely, desaturation adjustment of the rotating speed loop of the compressor is completed).
In one embodiment, the second set scaling factor Kc2This can be obtained by the following equation:
Kp2＝2ξJmωn；
wherein, Δ nmaxIs the compressor maximum speed drop; Δ imaxIs the compressor maximum current saturation difference; xi is a damping coefficient, and the value range can be between 1.2 and 1.5; omeganIs the resonance frequency, and the value range can be between 10 and 20; j. the design is a squaremIs the moment of inertia of the rotor within the compressor.
In an embodiment, as can be seen from the above formula, after the output current is saturated, the rotation speed variation value may be determined according to the current difference and the second set scaling factor, and the set rotation speed is adjusted based on the rotation speed variation value, so that the first output current and the second output current are consistent, thereby implementing control of the actual rotation speed and improving the stability of the operation of the compressor.
In one embodiment, the step of obtaining an actual speed of the compressor and determining a first output current based on the actual speed and a set speed of the compressor comprises: acquiring the actual rotating speed and the set rotating speed of the compressor, and making a difference between the actual rotating speed and the set rotating speed to obtain a second difference result; and performing PI regulation on the second difference result to obtain the first output current.
In one embodiment, the second difference result may be PI adjusted by the controller or the processor, and a specific adjustment process is shown in fig. 4. The specific formula is as follows:
Kp2＝2ξJmωn
wherein: xi is a damping coefficient, and the value range can be between 1.2 and 1.5; omeganIs the resonance frequency, and the value range can be between 10 and 20; j. the design is a squaremIs the moment of inertia of the rotor within the compressor. The specific values of the parameters in the PI regulation process can be determined through the formula, so that the controller or the processor can calculate the specific values of the first output current based on the second difference result, and further subsequent processing is facilitated.
In one embodiment, the step of determining a second output current based on the first output current and the specified current, and outputting the second output current to the compressor includes: and comparing the first output current with the specified current to obtain a second comparison result. And if the second comparison result shows that the first output current is greater than the specified current, determining that the second output current is the specified current, and outputting the specified current to the compressor. And if the second comparison result shows that the first output current is less than or equal to the specified current, determining that the second output current is the first output current, and outputting the first output current to the compressor.
In one embodiment, the first output current and the specified current may be compared by the controller or the processor for a difference, and a difference comparison result (i.e., the second comparison result) may be obtained. And if the second comparison result is that the first output current is greater than the specified current, determining that the second output current is the specified current at the moment, and the output current is saturated at the moment. Namely, the current output to the compressor at this time is the specified current. That is, at this time, the set rotation speed needs to be adjusted, so that the first output current is adjusted, the first output current is smaller than or equal to the specified current, and the actual rotation speed of the compressor is controlled.
And if the first comparison result shows that the first output current is less than or equal to the specified current, determining that the second output current is the first output current at the moment, and the output current is not saturated at the moment. Namely, the current output to the compressor at this time is the first output current. That is, the set rotation speed does not need to be adjusted at this time. By the adjusting mode, the phenomenon that the rotating speed of the compressor suddenly drops or rises due to the fact that the voltage of the power grid is abnormal can be avoided, and therefore the stability and the reliability of the operation of the compressor are improved.
In one embodiment, the step of determining a rotation speed variation value based on the current difference value and a second set proportionality coefficient, and adjusting the set rotation speed according to the rotation speed variation value to realize the control of the actual rotation speed comprises: and filtering the current difference value to obtain the filtered current difference value. And acquiring the second set proportion coefficient, and multiplying the first set proportion coefficient by the filtered current difference value to obtain the rotating speed change value. And adjusting the set rotating speed based on the rotating speed change value so as to realize the control of the actual rotating speed.
In one embodiment, the controller or the processor may filter the voltage current value after obtaining the current difference value. Specifically, the current difference may be subjected to low-pass filtering processing. In one embodiment, the current difference value may be filtered by a low-pass filter, and the filtered current difference value is obtained. By carrying out low-pass filtering processing on the current difference, the problem that the rotating speed of the compressor suddenly drops or rises due to abnormal grid voltage can be effectively avoided.
As shown in fig. 5, the rotation speed variation curve 1 is the rotation speed variation curve of the conventional anti-integral saturation PI controller when facing voltage fluctuation. The rotation speed variation curve 2 is the control method provided by the application. As can be seen from fig. 5, regardless of whether the speed of recovering the grid voltage is fast or slow, the rotational speed of the compressor can be slowly recovered through the design of the low-pass filtering parameters, so as not to rapidly change or overshoot, thereby improving the reliability of the operation of the compressor.
Referring to fig. 6, in an embodiment, after the steps of determining a rotation speed variation value based on the current difference value and a second set scaling factor, and adjusting the set rotation speed according to the rotation speed variation value to realize the control of the actual rotation speed, the method further includes:
s302: judging whether the rotating speed change value is larger than a preset rotating speed value or not;
s304: if the rotating speed change value is larger than the preset rotating speed value, timing is started, and whether the current timing time is larger than a preset time threshold value or not is determined;
s306: if the current timing time is determined to be greater than the preset time threshold, determining that the power grid voltage falls or rises, and recording the frequency of the power grid voltage change;
s308: and determining whether the power grid voltage is abnormal or not based on the power grid voltage change times and preset times.
In one embodiment, whether the rotation speed variation value is greater than a preset rotation speed value may be determined by the controller or the processor. Specifically, the controller or the processor may compare the two, and if the rotation speed variation value is greater than the preset rotation speed value, execute step S304; if the rotating speed change value is smaller than or equal to the preset rotating speed value, recalculating the rotating speed change value at the moment.
In one embodiment, the controller or the processor determines that when the rotation speed variation value is greater than the preset rotation speed value, timing is started and whether the current timing time is greater than a preset time threshold value is determined. Comparing the current timing time with the preset time threshold, and if the current timing time is greater than the preset time threshold, executing step S306; if the current timing time is less than or equal to the preset time threshold, recalculating the rotating speed change value at the moment.
In one embodiment, when the controller or the processor determines that the rotation speed variation value is greater than the preset rotation speed value and the current timing time is greater than the preset time threshold, it may be determined that the grid voltage falls or rises. That is, it can be determined that the grid voltage has fallen or risen once, and the number of times of the grid voltage change can be recorded accumulatively.
In one embodiment, after determining that the grid voltage drops or rises once, the controller or the processor may determine whether the grid voltage change times is greater than the preset times, so as to determine whether the grid voltage is abnormal. Specifically, the controller or the processor may compare the grid voltage change frequency with the preset frequency, and obtain a comparison result. And if the comparison result shows that the power grid voltage change times are greater than the preset times, determining that the power grid voltage is abnormal. At this time, the controller or the processor does not adjust the current loop or the rotation speed loop of the compressor within a certain time (the specific time can be set according to the actual requirement, for example, can be set to 30 s). If the comparison result is that the grid voltage change times are less than or equal to the preset times, the grid voltage can be determined to be normal, and then the step S302 is returned to.
As shown in fig. 5, the actual speed of the compressor is increased from n in the event of a drop in the mains voltage1Fall to n2At this time, the difference between the set rotation speed and the actual rotation speed is calculated, and the time Δ T for which the difference is greater than the preset value Δ n is continued. When the rotating speed difference is larger than delta n and the duration time exceeds delta T, the voltage drop can be judged once, at the moment, the controller or the processor controls the rotating speed loop, and the current loop exits the saturation state. Otherwise, the controller or the processor does not control the rotating speed loop, and the current loop exits the saturation state. In one embodiment, when the voltage of the power grid is recovered before the voltage drop condition is met, the actual rotating speed of the compressor is automatically and slowly recovered, so that rapid change or overshoot is avoided, and the operation reliability of the compressor is improved.
In summary, the present application first obtains an actual current of a compressor, and determines a first output voltage based on the actual current and a specified current of the compressor; then acquiring a power grid voltage, determining a second output voltage based on the first output voltage and the power grid voltage, and outputting the second output voltage to the compressor; secondly, comparing the first output voltage with the second output voltage to obtain a voltage difference value; and finally, determining a current change value based on the voltage difference value and a first set proportion coefficient, and adjusting the specified current according to the current change value to realize the control of the actual current. By adopting the method, when the power grid voltage is abnormal, the rotating speed of the compressor is prevented from suddenly dropping or suddenly rising, and the running stability of the compressor is improved, so that the working power grid quality range of the air conditioning unit is expanded, and the demand of regions with poor power quality is met.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A control method of a compressor, characterized by comprising:
acquiring an actual current of a compressor, and determining a first output voltage based on the actual current and a specified current of the compressor;
acquiring a power grid voltage, determining a second output voltage based on the first output voltage and the power grid voltage, and outputting the second output voltage to the compressor;
comparing the first output voltage with the second output voltage to obtain a voltage difference value;
determining a current change value based on the voltage difference value and a first set proportionality coefficient, and adjusting the specified current according to the current change value to realize control over the actual current;
after the step of obtaining an actual current of the compressor and determining a first output voltage based on the actual current and a specified current of the compressor, the method further comprises:
acquiring the actual rotating speed of the compressor, and determining a first output current based on the actual rotating speed and the set rotating speed of the compressor;
determining a second output current based on the first output current and the specified current, and outputting the second output current to the compressor;
comparing the first output current with the second output current to obtain a current difference value;
and determining a rotating speed change value based on the current difference value and a second set proportion coefficient, and adjusting the set rotating speed according to the rotating speed change value to realize the control of the actual rotating speed.
2. The method of controlling a compressor according to claim 1, wherein the step of obtaining an actual current of the compressor and determining the first output voltage based on the actual current and a specified current of the compressor comprises:
acquiring the actual current and the specified current of the compressor, and subtracting the actual current and the specified current to obtain a first difference result;
and performing PI regulation on the first difference result to obtain the first output voltage.
3. The method of controlling a compressor of claim 1, wherein the steps of obtaining a grid voltage, determining a second output voltage based on the first output voltage and the grid voltage, and outputting the second output voltage to the compressor comprise:
acquiring the power grid voltage, and comparing the power grid voltage with the first output voltage to obtain a first comparison result;
if the first comparison result is that the first output voltage is greater than the power grid voltage, determining that the second output voltage is the power grid voltage, and outputting the power grid voltage to the compressor at the moment;
and if the first comparison result shows that the first output voltage is less than or equal to the power grid voltage, determining that the second output voltage is the first output voltage, and outputting the first output voltage to the compressor.
4. The method of claim 1, wherein the step of determining a current variation value based on the voltage difference value and a first set scaling factor, and adjusting the designated current according to the current variation value to achieve the control of the actual current comprises:
filtering the voltage difference value to obtain the filtered voltage difference value;
acquiring the first set proportion coefficient, and multiplying the first set proportion coefficient by the filtered voltage difference value to obtain the current change value;
and adjusting the specified current based on the current change value to realize the control of the actual current.
5. The control method of compressor according to claim 1 or 4, wherein the first set proportionality coefficient Kc1Comprises the following steps:
Kp1＝Lωc；
wherein, Δ imaxIs the maximum current saturation difference, Δ u, of the compressormaxIs the maximum voltage saturation difference of the compressor, L is the inductance parameter of the compressor, ωcIs the bandwidth of the motor in the compressor.
6. The control method of a compressor according to claim 1, wherein the step of determining a second output current based on the first output current and the specified current, and outputting the second output current to the compressor comprises:
comparing the first output current with the specified current to obtain a second comparison result;
if the second comparison result is that the first output current is larger than the specified current, determining that the second output current is the specified current, and outputting the specified current to the compressor;
and if the second comparison result shows that the first output current is less than or equal to the specified current, determining that the second output current is the first output current, and outputting the first output current to the compressor.
7. The method of controlling a compressor according to claim 1, wherein the step of determining a rotation speed variation value based on the current difference value and a second set proportionality coefficient, and adjusting the set rotation speed according to the rotation speed variation value to achieve the control of the actual rotation speed comprises:
filtering the current difference value to obtain the filtered current difference value;
acquiring a second set proportion coefficient, and multiplying the second set proportion coefficient by the filtered current difference value to obtain the rotating speed change value;
and adjusting the set rotating speed based on the rotating speed change value so as to realize the control of the actual rotating speed.
8. The control method of compressor according to claim 1 or 7, wherein the second set proportionality coefficient Kc2Comprises the following steps:
Kp2＝2ξJmωn；
wherein, Δ nmaxIs the maximum speed drop, Δ i, of the compressormaxIs the maximum current saturation difference of the compressor, xi is the damping coefficient, ωnIs the resonant frequency, JmIs the moment of inertia of the rotor within the compressor.
9. The method of controlling a compressor according to claim 1, wherein after the step of determining a rotation speed variation value based on the current difference value and a second set proportionality coefficient, and adjusting the set rotation speed according to the rotation speed variation value to achieve the control of the actual rotation speed, the method further comprises:
judging whether the rotating speed change value is larger than a preset rotating speed value or not;
if the rotating speed change value is larger than the preset rotating speed value, timing is started, and whether the current timing time is larger than a preset time threshold value or not is determined;
if the current timing time is determined to be greater than the preset time threshold, determining that the power grid voltage falls or rises, and recording the frequency of the power grid voltage change;
and determining whether the power grid voltage is abnormal or not based on the power grid voltage change times and preset times.
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