CN112503806A - Method and device for controlling command rotating speed of variable frequency compressor - Google Patents

Method and device for controlling command rotating speed of variable frequency compressor Download PDF

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Publication number
CN112503806A
CN112503806A CN202011421830.3A CN202011421830A CN112503806A CN 112503806 A CN112503806 A CN 112503806A CN 202011421830 A CN202011421830 A CN 202011421830A CN 112503806 A CN112503806 A CN 112503806A
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power
rotating speed
variable frequency
characterizing
compressor
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CN112503806B (en
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杨正
赵鹏飞
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Sichuan Hongmei Intelligent Technology Co Ltd
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Sichuan Hongmei Intelligent Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/05—Cost reduction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a method and a device for controlling the instruction rotating speed of a variable frequency compressor, wherein the method comprises the following steps: determining a power area of normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor; determining first power of the variable frequency compressor when the variable frequency compressor is started at a set rotating speed and a set torque, wherein the first power falls into the power area; determining a second power when the variable frequency compressor runs at the set rotating speed for a set time; judging whether the second power falls into the power region; if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power; and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero. The scheme of the invention can reduce the control hardware of the refrigeration system so as to reduce the manufacturing cost of the refrigeration system.

Description

Method and device for controlling command rotating speed of variable frequency compressor
Technical Field
The invention relates to the technical field of compressors, in particular to a method and a device for controlling the instruction rotating speed of a variable frequency compressor.
Background
The compressor is used as a core component in a refrigeration system and is divided into a variable frequency compressor and a fixed frequency compressor according to whether the rotating speed can be changed or not. One of the advantages of the inverter compressor is that the rotating speed is variable, and the rotating speed can be adjusted according to the refrigeration requirement, so that the system achieves the purposes of rapid refrigeration (the rotating speed is in a high-speed state) and stable temperature (the rotating speed is in a medium-low speed state). Therefore, the rotation speed of the compressor directly affects the refrigerating capacity and effect of the refrigerating system.
In the prior art, temperature sensors are usually installed in an evaporator and a condenser of a refrigeration system to calculate according to a difference between a detected temperature of the temperature sensors and a set temperature. In general, the larger the difference value of the protection temperatures is, the higher the calculated command rotating speed of the inverter compressor is; otherwise, the lower the temperature is, when the detected temperature is lower than the set temperature by a certain value, the compressor is stopped. According to the scheme, the temperature sensor is adopted to control the instruction rotating speed of the variable-frequency compressor, so that the control hardware of the refrigerating system can be increased, and the manufacturing cost of the refrigerating system is not reduced.
Therefore, it is necessary to provide a method and a device for controlling the commanded rotational speed of the inverter compressor to reduce the control hardware of the refrigeration system, so as to reduce the manufacturing cost of the refrigeration system.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling the instruction rotating speed of a variable frequency compressor, which can reduce the control hardware of a refrigerating system so as to reduce the manufacturing cost of the refrigerating system.
In a first aspect, an embodiment of the present invention provides a method for controlling an instruction rotation speed of an inverter compressor, including:
determining a power area of normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor;
determining first power of the variable frequency compressor when the variable frequency compressor is started at a set rotating speed and a set torque, wherein the first power falls into the power area;
determining a second power when the variable frequency compressor runs at the set rotating speed for a set time;
judging whether the second power falls into the power region;
if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power;
and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero.
In one possible design, the controlling the command rotation speed of the inverter compressor according to the difference value between the second power and the first power includes:
if the difference value between the second power and the first power is larger than or equal to zero, controlling the instruction rotating speed of the variable-frequency compressor to increase the first rotating speed;
and if the difference value between the second power and the first power is smaller than zero, controlling the instruction rotating speed of the variable-frequency compressor to reduce the second rotating speed.
In one possible design, the controlling the commanded speed of the inverter compressor to increase by the first speed if the difference between the second power and the first power is greater than or equal to zero includes:
the first rotational speed is determined according to a first formula as follows:
ΔS1＝K1*ΔP+b
wherein, Delta S1For characterizing said first speed of rotation, K1For characterizing a first slope, Δ P for characterizing a difference between the second power and the first power, b for characterizing an intercept and b being greater than zero, K1Has a value of [ b/12, b/8]；
If the difference value between the second power and the first power is smaller than zero, controlling the instruction rotating speed of the variable-frequency compressor to reduce the second rotating speed, wherein the step comprises the following steps:
the second rotational speed is determined according to a second formula as follows:
ΔS2＝K2*ΔP-b
wherein, Delta S2For characterizing said second speed of rotation, K2For characterizing the second slope, K2Has a value of [ b/17, b/13]。
In one possible design, after the controlling the commanded rotational speed of the inverter compressor according to the difference between the second power and the first power, the method further includes:
and controlling the instruction rotating speed of the variable frequency compressor according to the current rotating speed of the variable frequency compressor.
In one possible design, the controlling the command rotation speed of the inverter compressor according to the current rotation speed of the inverter compressor includes:
and controlling the command rotating speed of the variable frequency compressor to change into a third rotating speed according to a third formula as follows:
Figure BDA0002822709580000031
wherein, Delta S3For characterizing said third speed, SmaxThe maximum allowable rotating speed of the variable frequency compressor is represented, and S is used for representing the current rotating speed.
In one possible design, the determining the first power when the inverter compressor is started at the set rotation speed and the set torque includes:
acquiring a first direct shaft voltage, a first direct shaft current, a first quadrature shaft voltage and a first quadrature shaft current when the variable frequency compressor is started at a set rotating speed and a set torque;
determining a first power according to the first direct axis voltage, the first direct axis current, the first quadrature axis voltage and the first quadrature axis current;
the determining of the second power when the inverter compressor runs at the set rotating speed for the set time comprises:
acquiring a second direct-axis voltage, a second direct-axis current, a second quadrature-axis voltage and a second quadrature-axis current when the variable frequency compressor runs at the set rotating speed for a set time;
and determining second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage and the second quadrature axis current.
In one possible design, the determining a first power based on the first direct voltage, the first direct current, the first quadrature voltage, and the first quadrature current includes:
the first power is determined according to the fourth formula:
P1＝1.5*(Vd1*Id1+Vq1*Iq1)
wherein, P1For characterizing said first power, Vd1For characterizing said first direct voltage, Id1For characterizing said first direct current, Vq1For characterizing said first quadrature axis voltage, Iq1For characterizing the first quadrature axis current;
determining a second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage, and the second quadrature axis current, including:
the second power is determined according to the fifth formula:
P2＝1.5*(Vd2*Id2+Vq2*Iq2)
wherein, P2For characterizing said second power, Vd2For characterizing the second direct-axis voltage, Id2For characterizing said second direct axis current, Vq2For characterizing said second quadrature axis voltage, Iq2For characterizing the second quadrature axis current.
In a second aspect, an embodiment of the present invention provides an apparatus for controlling a commanded rotational speed of an inverter compressor, including:
the first determining module is used for determining a power area of normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor;
the second determining module is used for determining first power of the variable frequency compressor when the variable frequency compressor is started at a set rotating speed and a set torque, wherein the first power falls into the power area;
the third determining module is used for determining second power when the variable frequency compressor runs at the set rotating speed for a set time;
the judging module is used for judging whether the second power falls into the power area;
if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power;
and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero.
In a third aspect, an embodiment of the present invention provides a device for controlling a command rotational speed of an inverter compressor, including: at least one memory and at least one processor;
the at least one memory to store a machine readable program;
the at least one processor is configured to invoke the machine-readable program to perform the method described above.
In a fourth aspect, embodiments of the present invention provide a computer-readable medium having stored thereon computer instructions, which, when executed by a processor, cause the processor to perform the method described above.
According to the scheme, the method and the device for controlling the instruction rotating speed of the variable frequency compressor provided by the invention have the advantages that whether the second power falls into the power region or not is judged firstly, the instruction rotating speed is initially controlled, and then the instruction rotating speed of the variable frequency compressor can be controlled according to the difference value of the second power and the first power after the second power falls into the power region, so that the instruction rotating speed of the variable frequency compressor can be controlled without adopting a temperature sensor, the control hardware of a refrigerating system can be reduced, and the manufacturing cost of the refrigerating system can be reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling a commanded rotational speed of an inverter compressor according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for controlling a commanded rotational speed of an inverter compressor according to another embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the relationship between the rotational speed, torque and power of the inverter compressor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an apparatus for controlling a commanded rotational speed of an inverter compressor according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a device for controlling the commanded rotational speed of the inverter compressor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As described in the background art, in the related art, it is common to install temperature sensors at an evaporator and a condenser of a refrigeration system to perform calculation based on a difference between a detected temperature of the temperature sensors and a set temperature. According to the scheme, the temperature sensor is adopted to control the instruction rotating speed of the variable-frequency compressor, so that the control hardware of the refrigerating system can be increased, and the manufacturing cost of the refrigerating system is not reduced.
In order to solve the above problem, it is conceivable to control the command rotational speed of the inverter compressor without using a temperature sensor. In the actual working process of the inverter compressor, the larger the temperature difference between the evaporator and the condenser is, the heavier the temperature load (i.e. the torque, in the inverter compressor, the torque is embodied in the manner of the temperature load) is, and the higher the power (the power is equal to the rotation speed multiplied by the torque) is at a certain rotation speed; conversely, the lower the power. Based on this, it is conceivable to control the command rotational speed in accordance with a change in power (including a change direction and a change amount). According to the scheme, whether the second power falls into the power area or not is judged firstly, the instruction rotating speed is initially controlled, and then after the second power falls into the power area, the instruction rotating speed of the variable frequency compressor can be controlled according to the difference value of the second power and the first power, so that the instruction rotating speed of the variable frequency compressor can be controlled without adopting a temperature sensor, and therefore control hardware of a refrigeration system can be reduced, and the manufacturing cost of the refrigeration system is reduced.
The above is the inventive concept of the present invention, and the scheme provided by the present invention can be obtained based on the inventive concept, and the present invention is explained in detail below.
Fig. 1 is a flow chart of a method for controlling the command rotational speed of the inverter compressor according to the present invention. As shown in fig. 1, the method may include the steps of:
step 101, determining a power area for normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor;
step 102, determining a first power of the variable frequency compressor when the variable frequency compressor is started at a set rotating speed and a set torque, wherein the first power falls into a power area;
103, determining a second power when the variable frequency compressor runs at a set rotating speed for a set time;
step 104, judging whether the second power falls into a power area;
if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power;
and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero.
In the embodiment of the invention, the control method firstly judges whether the second power falls into the power region, performs initial control on the instruction rotating speed, and then can control the instruction rotating speed of the inverter compressor according to the difference value (namely the change direction and the change quantity of the power) between the second power and the first power after the second power falls into the power region, so that the instruction rotating speed of the inverter compressor can be controlled without adopting a temperature sensor, and therefore, the control hardware of the refrigeration system can be reduced, and the manufacturing cost of the refrigeration system can be reduced.
Based on the method for controlling the command rotating speed of the inverter compressor shown in fig. 1, in an embodiment of the present invention, controlling the command rotating speed of the inverter compressor according to the difference between the second power and the first power includes:
if the difference value between the second power and the first power is larger than or equal to zero, controlling the instruction rotating speed of the variable frequency compressor to increase the first rotating speed;
and if the difference value between the second power and the first power is less than zero, controlling the command rotating speed of the variable frequency compressor to reduce the second rotating speed.
In the embodiment of the invention, because the second power is obtained by operating the inverter compressor at the set rotating speed for the set time period, and the power is equal to the rotating speed multiplied by the torque (namely, the temperature load), when the inverter compressor operates at the set rotating speed, if the difference value between the second power and the first power is greater than zero, the temperature load is increased, and at the moment, the requirement of the refrigerating capacity of the inverter compressor is insufficient, so that the rotating speed needs to be increased to increase the refrigerating capacity, namely, the command rotating speed of the inverter compressor needs to be controlled to increase the first rotating speed. If the difference between the second power and the first power is equal to zero, although the temperature load is not increased, since the refrigeration system needs to exchange heat with the outside, i.e. the refrigeration capacity needs to be consumed, the demand of the refrigeration capacity of the inverter compressor is insufficient at this time, and therefore the rotating speed needs to be increased to increase the refrigeration capacity, i.e. the command rotating speed of the inverter compressor needs to be controlled to increase the first rotating speed. If the difference value between the second power and the first power is less than zero, the temperature load is reduced, and the requirement of the refrigerating capacity of the variable frequency compressor is sufficient at the moment, so that the rotating speed needs to be reduced to reduce the refrigerating capacity, namely the command rotating speed of the variable frequency compressor needs to be controlled to reduce the second rotating speed.
It will be appreciated that the first speed and the second speed are not fixed, but both values are related to the difference between the second power and the first power, i.e. the values will change with the difference between the second power and the first power.
Based on the method for controlling the command rotating speed of the inverter compressor shown in fig. 1, in an embodiment of the present invention, if the difference between the second power and the first power is greater than or equal to zero, controlling the command rotating speed of the inverter compressor to increase the first rotating speed comprises:
the first rotational speed is determined according to a first formula as follows:
ΔS1＝K1*ΔP+b
wherein, Delta S1For characterizing the first speed of rotation, K1For characterizing a first slope, Δ P for characterizing a difference between the second power and the first power, b for characterizing an intercept and b being greater than zero, K1Has a value of [ b/12, b/8]；
If the difference value between the second power and the first power is less than zero, controlling the command rotating speed of the variable frequency compressor to reduce the second rotating speed, and the method comprises the following steps:
the second rotational speed is determined according to a second formula as follows:
ΔS2＝K2*ΔP-b
wherein, Delta S2For characterizing the second speed of rotation, K2For characterizing the second slope, K2Has a value of [ b/17, b/13]。
In the embodiment of the invention, when the difference value between the second power and the first power is greater than or equal to zero, the value of the first rotating speed is positive, so that the command rotating speed of the variable frequency compressor is increased, and the increased rotating speed is delta S1(ii) a When the difference value between the second power and the first power is less than zero, the value of the first rotating speed is negative, so that the command rotating speed of the variable frequency compressor is reduced, and the reduced rotating speed is delta S2. Furthermore, K2Is less than K1The reason for this is that when the difference between the second power and the first power is greater than or equal to zero, the temperature load is increased, and the temperature load is more likely to cause the shutdown or failure of the inverter compressor than the temperature load is decreased, so the value of the first rotation speed needs to be increased.
Note that K is the number of different refrigeration systems1、K2And b are different in value, and the parameter values can be determined according to specific experimental data, which are not described herein again.
Based on the method for controlling the command rotational speed of the inverter compressor shown in fig. 1, in an embodiment of the present invention, after controlling the command rotational speed of the inverter compressor according to the difference between the second power and the first power, the method further includes:
and controlling the instruction rotating speed of the variable frequency compressor according to the current rotating speed of the variable frequency compressor.
In the embodiment of the invention, the variation range of the command rotating speed of the inverter compressor is large only according to the difference value between the second power and the first power, which is not beneficial to the control of the command rotating speed, namely, the balance of the refrigerating system cannot be quickly realized (when in balance, the refrigerating capacity is equal to the heating capacity), the refrigerating system is hopefully maintained near the balance point, if the refrigerating system is far away from the balance point in the operation process, the difference between the refrigerating capacity and the heating capacity of the refrigerating system is large, which is unfavorable. Therefore, it is necessary to consider further control of the command rotational speed. When the instruction rotating speed of the variable frequency compressor is controlled according to the current rotating speed of the variable frequency compressor, the change amplitude of the instruction rotating speed of the variable frequency compressor can be further reduced, so that the control of the instruction rotating speed is facilitated.
Based on the method for controlling the command rotating speed of the inverter compressor shown in fig. 1, in an embodiment of the present invention, the controlling the command rotating speed of the inverter compressor according to the current rotating speed of the inverter compressor includes:
and controlling the command rotating speed of the variable frequency compressor to change a third rotating speed according to a third formula as follows:
Figure BDA0002822709580000091
wherein, Delta S3For characterizing the third speed, SmaxThe maximum allowable rotating speed of the variable frequency compressor is represented, and S is used for representing the current rotating speed.
In the embodiment of the invention, when the current rotating speed S is zero, the third rotating speed delta S3Is the largest and is b; at the current rotation speed S of SmaxAt the third rotation speed deltaS3The value of (a) is the smallest and is-b. Therefore, the third rotation speed Δ S3The value of (a) may vary between-b and b. And the first rotation speed deltaS1B, the second rotational speed Δ S when the value of (b) is the minimum2The maximum value of the first power is-b, namely the minimum value of the change amplitude of the instruction rotating speed of the variable frequency compressor is b when the instruction rotating speed of the variable frequency compressor is controlled according to the difference value of the second power and the first power. And, when the difference between the second power and the first power is less than zero, determining the second rotation speedΔS2Negative and with a maximum value of-b, to the extent that the current speed S is generally less than
Figure BDA0002822709580000101
I.e. the determined third rotational speed deltas3Greater than zero, and Δ S3The variation range of (b) is (0); and the change amplitude of the command rotating speed of the variable frequency compressor is (Delta S)1+ΔS3) Or (Δ S)2+ΔS3) Therefore, the amplitude of the change of the command rotating speed of the variable frequency compressor can be reduced by the third formula, thereby being beneficial to the control of the command rotating speed.
Based on the method for controlling the command rotating speed of the inverter compressor shown in fig. 1, in one embodiment of the invention, determining the first power of the inverter compressor when the inverter compressor is started at the set rotating speed and the set torque comprises the following steps:
acquiring a first direct-axis voltage, a first direct-axis current, a first quadrature-axis voltage and a first quadrature-axis current when the variable frequency compressor is started at a set rotating speed and a set torque;
determining first power according to the first direct-axis voltage, the first direct-axis current, the first quadrature-axis voltage and the first quadrature-axis current;
determining a second power of the inverter compressor when the inverter compressor runs at the set rotating speed for a set time, comprising:
acquiring a second direct-axis voltage, a second direct-axis current, a second quadrature-axis voltage and a second quadrature-axis current when the variable frequency compressor runs at a set rotating speed for a set time;
and determining the second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage and the second quadrature axis current.
In the embodiment of the invention, the power of the inverter compressor is respectively related to the direct-axis voltage, the direct-axis current, the quadrature-axis voltage and the quadrature-axis current, so that the power at the current moment can be determined by determining the direct-axis voltage, the direct-axis current, the quadrature-axis voltage and the quadrature-axis current of the inverter compressor at different moments, and the first power and the second power can be rapidly determined.
Based on the method for controlling the command rotational speed of the inverter compressor shown in fig. 1, in an embodiment of the present invention, the determining the first power by the first direct current, the first quadrature voltage, and the first quadrature current includes:
the first power is determined according to the fourth formula:
P1＝1.5*(Vd1*Id1+Vq1*Iq1)
wherein, P1For characterizing the first power, Vd1For characterizing a first direct voltage, Id1For characterizing a first direct current, Vq1For characterizing a first quadrature axis voltage, Iq1For characterizing the first quadrature axis current;
determining a second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage and the second quadrature axis current, including:
the second power is determined according to the fifth formula:
P2＝1.5*(Vd2*Id2+Vq2*Iq2)
wherein, P2For characterizing the second power, Vd2For characterizing the second direct-axis voltage, Id2For characterizing the second direct-axis current, Vq2For characterizing the second quadrature axis voltage, Iq2For characterizing the second quadrature axis current.
In the embodiment of the invention, the first power and the second power can be determined according to a fourth formula and a fifth formula, wherein the power of the inverter compressor specifically refers to the output power of an inverter board in the refrigeration system. By determining the first power and the second power, the command rotating speed of the inverter compressor can be controlled according to the difference value between the second power and the first power.
As shown in fig. 2, another embodiment of the present invention further provides a method for controlling the commanded rotational speed of the inverter compressor. As shown in fig. 3, an embodiment of the present invention provides a relationship diagram of the rotational speed, the torque and the power of the inverter compressor. With reference to fig. 2 and 3, the method comprises the following steps:
step 201, determining a power area of normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor.
In this step, with reference to fig. 3, according to the rotation speed of the inverter compressor, boundary lines of the power regions of the inverter compressor in normal operation on the left and right sides in fig. 3 may be determined; according to the moment of the inverter compressor, the inclined boundary lines of the upper side and the lower side of the power area of the normal operation of the inverter compressor in the graph 3 can be determined; according to the maximum allowable power of the inverter compressor, the upper transverse boundary line of the power region of the inverter compressor in the figure 3 can be determined. That is, the power region is a region surrounded by the pentagon in fig. 3.
It should be noted that, in fig. 3, when the operating point of the inverter compressor is located outside the upper boundary line, it indicates that the temperature load is too heavy and the refrigeration system is in an overload state, for example, point H1 and point H2; when the working point of the inverter compressor is positioned outside the lower boundary line, it indicates that the temperature load is too light at the moment, and the refrigeration system is in an abnormal state, such as a point L1; the operating points located within the power zone indicate that the refrigeration system is in a normal operating state, such as point a1, point a2, point A3, and point L2.
It should be further noted that the load values of the temperature loads T0 to T7 are gradually increased.
Step 202, determining a first power of the inverter compressor when the inverter compressor is started at a set rotating speed and a set torque.
In this step, referring to fig. 3, the set rotation speed is speed1, for example, and the first power is a power corresponding to point a1, for example.
And step 203, determining a second power when the variable frequency compressor runs at the set rotating speed for the set time.
In this step, referring to fig. 3, after the operation for the set duration, the point a1 moves to the point a2, and the second power is the power corresponding to the point a2, where Δ P is PA2-PA1The unit is W (Watt).
And step 204, controlling the instruction rotating speed of the variable frequency compressor to be zero when the second power does not fall into the power area.
In this step, when the second power does not fall within the power region, it represents that the point corresponding to the second power is outside the power region in fig. 3, i.e., in an overload state or an abnormal state, which is disadvantageous, and thus it is necessary to control the commanded rotational speed of the inverter compressor to be zero.
And step 205, when the second power falls into the power area, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power.
In this step, the specific steps are as described above.
For example, when the difference between the second power and the first power is greater than or equal to zero, Δ S130 × Δ P + 300; when the difference between the second power and the first power is less than zero, Delta S220 × Δ P-300. Wherein, Delta S1In rpm, e.g. Δ S when Δ P is zero1At 300 rpm.
And step 206, controlling the instruction rotating speed of the variable frequency compressor according to the current rotating speed of the variable frequency compressor.
In this step, the specific steps are as described above.
For example, Δ S30.1 ═ 6000-S) -300. Wherein, Delta S3In rpm, e.g. Δ S when S is 2400rpm3At 60 rpm.
At this time, Δ S determined in step 2051And Δ S determined in step 2063And adding the command rotating speed to obtain the total change quantity delta S of the command rotating speed, namely delta S is 360 rpm. Further, at this time, the command rotation speed of the inverter compressor needs to be controlled to be 2760rpm (i.e., the sum of the current rotation speed S and the total change Δ S of the command rotation speed).
As shown in fig. 4 and 5, the embodiment of the present invention provides a device in which a control device for a command rotational speed of an inverter compressor is located and a control device for a command rotational speed of an inverter compressor. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. In terms of hardware, as shown in fig. 4, a hardware structure diagram of a device where a control apparatus for an instruction rotational speed of an inverter compressor provided in an embodiment of the present invention is located is shown, where in addition to the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 4, the device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing a message, and the like. Taking a software implementation as an example, as shown in fig. 5, as a logical apparatus, the apparatus is formed by reading a corresponding computer program instruction in a non-volatile memory into a memory by a CPU of a device in which the apparatus is located and running the computer program instruction.
As shown in fig. 5, the device for controlling the command rotational speed of the inverter compressor provided in this embodiment includes:
a first determining module 501, configured to determine a power region where the inverter compressor normally operates according to a rotation speed, a torque, and a maximum allowable power of the inverter compressor;
a second determining module 502, configured to determine a first power of the inverter compressor when the inverter compressor is started at a set rotation speed and a set torque, where the first power falls within the power region;
a third determining module 503, configured to determine a second power when the inverter compressor operates at the set rotation speed for a set duration;
a determining module 504, configured to determine whether the second power falls within the power region;
if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power;
and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero.
In this embodiment of the present invention, the first determining module 501 may be configured to execute step 101 in the above-described method embodiment, the second determining module 502 may be configured to execute step 102 in the above-described method embodiment, the third determining module 503 may be configured to execute step 103 in the above-described method embodiment, and the determining module 504 may be configured to execute step 104 in the above-described method embodiment.
In an embodiment of the present invention, the determining module 504 is configured to control the commanded rotational speed of the inverter compressor according to the difference between the second power and the first power, and is configured to:
if the difference value between the second power and the first power is larger than or equal to zero, controlling the instruction rotating speed of the variable-frequency compressor to increase the first rotating speed;
and if the difference value between the second power and the first power is smaller than zero, controlling the instruction rotating speed of the variable-frequency compressor to reduce the second rotating speed.
In an embodiment of the present invention, the determining module 504 is configured to, when the step of controlling the commanded rotational speed of the inverter compressor to increase by the first rotational speed if the difference between the second power and the first power is greater than or equal to zero is executed, perform the following operations:
the first rotational speed is determined according to a first formula as follows:
ΔS1＝K1*ΔP+b
wherein, Delta S1For characterizing said first speed of rotation, K1For characterizing a first slope, Δ P for characterizing a difference between said second power and said first power, b for characterizing an intercept, K1Has a value of [ b/12, b/8]；
The determining module 504 is configured to, when executing the step of controlling the instruction rotation speed of the inverter compressor to decrease the second rotation speed if the difference between the second power and the first power is smaller than zero, execute the following operations:
the second rotational speed is determined according to a second formula as follows:
ΔS2＝K2*ΔP-b
wherein, Delta S2For characterizing said second speed of rotation, K2For characterizing the second slope, K2Has a value of [ b/17, b/13]。
In an embodiment of the present invention, the determining module 504 is further configured to perform the following operations:
and controlling the instruction rotating speed of the variable frequency compressor according to the current rotating speed of the variable frequency compressor.
In an embodiment of the present invention, when the determining module 504 executes the control of the command rotational speed of the inverter compressor according to the current rotational speed of the inverter compressor, the following operations are executed:
and controlling the command rotating speed of the variable frequency compressor to change into a third rotating speed according to a third formula as follows:
Figure BDA0002822709580000151
wherein, Delta S3For characterizing said third speed, SmaxThe maximum allowable rotating speed of the variable frequency compressor is represented, and S is used for representing the current rotating speed.
In one embodiment of the present invention,
the second determining module 502 is configured to perform the following operations:
acquiring a first direct shaft voltage, a first direct shaft current, a first quadrature shaft voltage and a first quadrature shaft current when the variable frequency compressor is started at a set rotating speed and a set torque;
determining a first power according to the first direct axis voltage, the first direct axis current, the first quadrature axis voltage and the first quadrature axis current;
the third determining module 503 is configured to perform the following operations:
acquiring a second direct-axis voltage, a second direct-axis current, a second quadrature-axis voltage and a second quadrature-axis current when the variable frequency compressor runs at the set rotating speed for a set time;
and determining second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage and the second quadrature axis current.
In one embodiment of the present invention,
the second determining module 502 is configured to, when performing the determining of the first power according to the first direct axis voltage, the first direct axis current, the first quadrature axis voltage and the first quadrature axis current, perform the following operations:
the first power is determined according to the fourth formula:
P1＝1.5*(Vd1*Id1+Vq1*Iq1)
wherein, P1For characterizing said first power, Vd1For characterizingThe first direct voltage, Id1For characterizing said first direct current, Vq1For characterizing said first quadrature axis voltage, Iq1For characterizing the first quadrature axis current;
the third determining module 503 is configured to, when performing the determining of the second power according to the second direct-axis voltage, the second direct-axis current, the second quadrature-axis voltage, and the second quadrature-axis current, perform the following operations:
the second power is determined according to the fifth formula:
P2＝1.5*(Vd2*Id2+Vq2*Iq2)
wherein, P2For characterizing said second power, Vd2For characterizing the second direct-axis voltage, Id2For characterizing said second direct axis current, Vq2For characterizing said second quadrature axis voltage, Iq2For characterizing the second quadrature axis current.
It is to be understood that the configuration illustrated in the embodiment of the present invention does not specifically limit the control device for the command rotational speed of the inverter compressor. In other embodiments of the invention, the means for controlling the commanded rotational speed of the inverter compressor may include more or fewer components than illustrated, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
Because the content of information interaction, execution process, and the like among the modules in the device is based on the same concept as the method embodiment of the present invention, specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.
The embodiment of the invention also provides a device for controlling the instruction rotating speed of the variable frequency compressor, which comprises: at least one memory and at least one processor;
the at least one memory to store a machine readable program;
the at least one processor is used for calling the machine readable program to execute the method for controlling the instruction rotating speed of the inverter compressor in any embodiment of the invention.
Embodiments of the present invention also provide a computer-readable medium storing instructions for causing a computer to perform a method of controlling a commanded rotational speed of an inverter compressor as described herein. Specifically, a method or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the above-described embodiments is stored may be provided, and a computer (or a CPU or MPU) of the method or the apparatus is caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer via a communications network.
Further, it should be clear that the functions of any one of the above-described embodiments can be implemented not only by executing the program code read out by the computer, but also by performing a part or all of the actual operations by an operation method or the like operating on the computer based on instructions of the program code.
Further, it is to be understood that the program code read out from the storage medium is written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causes a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on instructions of the program code, thereby realizing the functions of any of the above-described embodiments.
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims (10)

1. The method for controlling the command rotating speed of the variable frequency compressor is characterized by comprising the following steps:
determining a power area of normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor;
determining first power of the variable frequency compressor when the variable frequency compressor is started at a set rotating speed and a set torque, wherein the first power falls into the power area;
determining a second power when the variable frequency compressor runs at the set rotating speed for a set time;
judging whether the second power falls into the power region;
if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power;
and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero.
2. The method of claim 1, wherein said controlling a commanded speed of said inverter compressor based on a difference between said second power and said first power comprises:
if the difference value between the second power and the first power is larger than or equal to zero, controlling the instruction rotating speed of the variable-frequency compressor to increase the first rotating speed;
and if the difference value between the second power and the first power is smaller than zero, controlling the instruction rotating speed of the variable-frequency compressor to reduce the second rotating speed.
3. The method of claim 2,
if the difference value between the second power and the first power is larger than or equal to zero, controlling the command rotating speed of the inverter compressor to increase the first rotating speed, wherein the step comprises the following steps:
the first rotational speed is determined according to a first formula as follows:
ΔS1＝K1*ΔP+b
wherein, Delta S1For characterizing said first speed of rotation, K1For characterizing a first slope, Δ P for characterizing a difference between the second power and the first power, b for characterizing an intercept and b being greater than zero, K1Has a value of [ b/12, b/8]；
If the difference value between the second power and the first power is smaller than zero, controlling the instruction rotating speed of the variable-frequency compressor to reduce the second rotating speed, wherein the step comprises the following steps:
the second rotational speed is determined according to a second formula as follows:
ΔS2＝K2*ΔP-b
wherein, Delta S2For characterizing said second speed of rotation, K2For characterizing the second slope, K2Has a value of [ b/17, b/13]。
4. The method of claim 3, wherein after said controlling the commanded rotational speed of the inverter compressor based on the difference between the second power and the first power, further comprising:
and controlling the instruction rotating speed of the variable frequency compressor according to the current rotating speed of the variable frequency compressor.
5. The method of claim 4, wherein the controlling the commanded rotational speed of the inverter compressor based on the current rotational speed of the inverter compressor comprises:
and controlling the command rotating speed of the variable frequency compressor to change into a third rotating speed according to a third formula as follows:
Figure FDA0002822709570000021
wherein, Delta S3For characterizing said third speed, SmaxThe maximum allowable rotating speed of the variable frequency compressor is represented, and S is used for representing the current rotating speed.
6. The method according to any one of claims 1 to 5,
the determining the first power of the inverter compressor when the inverter compressor is started at the set rotating speed and the set torque comprises the following steps:
acquiring a first direct shaft voltage, a first direct shaft current, a first quadrature shaft voltage and a first quadrature shaft current when the variable frequency compressor is started at a set rotating speed and a set torque;
determining a first power according to the first direct axis voltage, the first direct axis current, the first quadrature axis voltage and the first quadrature axis current;
the determining of the second power when the inverter compressor runs at the set rotating speed for the set time comprises:
acquiring a second direct-axis voltage, a second direct-axis current, a second quadrature-axis voltage and a second quadrature-axis current when the variable frequency compressor runs at the set rotating speed for a set time;
and determining second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage and the second quadrature axis current.
7. The method of claim 6, wherein determining a first power from the first direct voltage, the first direct current, the first quadrature voltage, and the first quadrature current comprises:
the first power is determined according to the fourth formula:
P1＝1.5*(Vd1*Id1+Vq1*Iq1)
wherein, P1For characterizing said first power, Vd1For characterizing said first direct voltage, Id1For characterizing said first direct current, Vq1For characterizing said first quadrature axis voltage, Iq1For characterizing the first quadrature axis current;
determining a second power according to the second direct axis voltage, the second direct axis current, the second quadrature axis voltage, and the second quadrature axis current, including:
the second power is determined according to the fifth formula:
P2＝1.5*(Vd2*Id2+Vq2*Iq2)
wherein, P2For characterizing said second power, Vd2For characterizing the second direct-axis voltage, Id2For characterizing said second direct axis current, Vq2For characterizing said second quadrature axis voltage, Iq2For characterizing the second quadrature axis current.
8. Control device of inverter compressor's instruction rotational speed, its characterized in that includes:
the first determining module is used for determining a power area of normal operation of the inverter compressor according to the rotating speed, the moment and the maximum allowable power of the inverter compressor;
the second determining module is used for determining first power of the variable frequency compressor when the variable frequency compressor is started at a set rotating speed and a set torque, wherein the first power falls into the power area;
the third determining module is used for determining second power when the variable frequency compressor runs at the set rotating speed for a set time;
the judging module is used for judging whether the second power falls into the power area;
if so, controlling the instruction rotating speed of the variable frequency compressor according to the difference value of the second power and the first power;
and if not, controlling the instruction rotating speed of the variable frequency compressor to be zero.
9. Control device of inverter compressor's instruction rotational speed, its characterized in that includes: at least one memory and at least one processor;
the at least one memory to store a machine readable program;
the at least one processor, configured to invoke the machine readable program to perform the method of any of claims 1 to 7.
10. A computer readable medium having stored thereon computer instructions which, when executed by a processor, cause the processor to perform the method of any of claims 1 to 7.
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