CN111536023A - Control method and system for compressor running frequency interval and readable storage medium - Google Patents
Control method and system for compressor running frequency interval and readable storage medium Download PDFInfo
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- CN111536023A CN111536023A CN202010405818.7A CN202010405818A CN111536023A CN 111536023 A CN111536023 A CN 111536023A CN 202010405818 A CN202010405818 A CN 202010405818A CN 111536023 A CN111536023 A CN 111536023A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- 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
Abstract
The invention discloses a control method, a system and a readable storage medium for an operating frequency interval of a compressor, wherein the method comprises the following steps: acquiring the actual environment temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and respectively judging the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor; and controlling the working frequency of the compressor by combining a preset program with the actual outlet water temperature. The invention improves the adaptability of the unit, reduces the failure rate and noise of the unit and improves the stability and energy conservation of the system by carrying out interval control on the working frequency of the compressor.
Description
Technical Field
The present invention relates to the field of frequency control technologies, and in particular, to a method and a system for controlling an operating frequency interval of a compressor, and a readable storage medium.
Background
Conventional compressors allow for operation in a frequency range that is full range operation without upper and lower limits. With the change of the environmental temperature and the water temperature, the high-temperature protection, the high-voltage protection and the overcurrent protection of exhaust temperature, the high-temperature protection and the oil return protection of a driving plate driving module and the poor unit adaptability are easily caused;
the actual operation frequency of the traditional compressor is controlled according to the temperature difference between the water temperature and the target water temperature and the operation frequency calculated according to the change of the temperature difference rate, so that the basic safety can be ensured, but the optimal operation state cannot be realized in the aspects of comfort (high noise), energy saving (high power consumption) and reliability (large system fluctuation);
disclosure of Invention
The invention provides a control method and a system for an operating frequency range of a compressor and a readable storage medium, aiming at overcoming the defects that the prior art has poor adaptability of a compressor frequency control allowable operating frequency range to a unit which operates in a whole region, and the traditional control method has high noise, poor energy saving performance and large system fluctuation.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
the invention provides a control method of an operation frequency interval of a compressor, which comprises the following steps:
s1: acquiring the actual ambient temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and acquiring the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor respectively through preset frequency interval functions;
s2: and controlling the working frequency of the compressor between the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor by combining the actual outlet water temperature.
In this embodiment, step S1 specifically includes:
s101: acquiring the actual environment temperature in real time by using an environment temperature sensor;
s102: acquiring the actual outlet water temperature in real time by using an outlet water sensor;
s103: acquiring the actual coil temperature in real time by using a coil temperature sensor;
s104: and acquiring the lowest frequency and the highest frequency of the compressor operation by utilizing the acquired actual environment temperature and the actual outlet water temperature value and combining a preset frequency operation interval function.
In this embodiment, the frequency operation interval function includes: a first relation function and a second relation function, and the specific process of step S104 is:
s1041: deducing a first relation function of the ambient temperature, the water outlet temperature and the highest frequency from the running power of the compressor;
s1042: deducing a second relation function of the environment temperature, the water outlet temperature and the lowest frequency from the safety test data of the compressor; the safety test data is test data acquired by the compressor under different reference dimensions, wherein the reference dimensions comprise: actual demands of users at different ambient temperatures; the performance coefficient of the unit is greater than or equal to 1.0; the preset oil return standard of the compressor is met;
s1043: obtaining the lowest frequency and the highest frequency under the actual environment temperature and the actual water outlet temperature through a first relation function and a second relation function according to the actual environment temperature, the actual water outlet temperature and the coil temperature, and taking the region between the lowest frequency and the highest frequency as an operation region of the frequency;
s1044: the operating frequency of the compressor is controlled to be within the operating range of the frequency.
In this scheme, the specific process of deriving the first relation function between the ambient temperature and the maximum frequency and the leaving water temperature from the operating power of the compressor in step S1041 is as follows:
the maximum permissible operating frequency is obtained by the formula of the operating power and the condensation temperature and the evaporation temperature of the compressor, which is as follows:
P＝a1+x*a2+y*a3+x.^2*a4+x*y*a5+y.^2*a6+x.^3*a7+y*x.^2*a8+x*y.^2*a9+y.^3*a10； (1)
Pmax＝Np (2)
wherein P represents the power of the compressor; x represents the evaporation temperature; y represents the condensation temperature; a1-a10 represents power coefficients; pmax represents the maximum allowed operating frequency, which is determined according to the current protection value of the hardware module; np represents a constant;
combining the formula 1 and the formula 2 to obtain the highest operation frequency, namely the allowed maximum operation frequency;
in step 1042, the step of deriving the second relationship function between the ambient temperature and the lowest frequency from the safety test data of the compressor is specifically as follows:
the demands of the room on the heating capacity and the refrigerating capacity are met by the user at different environmental temperatures; according to the capacity coefficient of the compressor, the heating capacity of the compressor is obtained by calculation through a heating capacity formula (3), and the calculation formula is as follows:
Q＝(b1+x*b2+y*b3+x.^2*b4+x*y*b5+y.^2*b6+x.^3*b7+y*x.^2*b8+x*y.^2*b9+y.^3*b10)/3.415+p (3)
Quser＝-kT+c (4)
wherein Q represents the unit heating capacity; quser indicates that the user needs heat; k represents a ring temperature coefficient; t represents the ambient temperature; c represents a demand capability coefficient; b1 to b10 represent heating capacity coefficients.
A second aspect of the present invention provides a variable frequency interval control system, including: the control method program of the compressor operation frequency interval is executed by the processor to realize the following steps:
s1: acquiring the actual ambient temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and acquiring the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor through a preset frequency operation interval function;
s2: and controlling the working frequency of the compressor between the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor by combining the actual outlet water temperature.
A third aspect of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a program for a method for controlling an operating frequency interval of a compressor, and when the program for the method for controlling the operating frequency interval of the compressor is executed by a processor, the method for controlling the operating frequency interval of the compressor is implemented.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention improves the adaptability of the unit, reduces the failure rate and noise of the unit and improves the stability and energy conservation of the system by carrying out interval control on the working frequency of the compressor.
Drawings
Fig. 1 is a flow chart of a control method for an operating frequency range of a compressor according to the present invention.
Fig. 2 is a flowchart illustrating a step S1 of a method for controlling an operating frequency interval of a compressor according to the present invention.
FIG. 3 is a flowchart illustrating the step S2 of the method for controlling the operation frequency interval of the compressor according to the present invention
Fig. 4 is a graph of the operating power curve for the highest/medium frequency of the present invention.
FIG. 5 is a schematic diagram showing the relationship between the amount of heat required by a user and the ambient temperature in the present invention.
Fig. 6 is a schematic diagram of the temperature range of the compressor in the heating state.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, a first aspect of the present invention provides a method for controlling an operating frequency interval of a compressor, comprising the steps of:
s1: acquiring the actual ambient temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and acquiring the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor through a preset frequency operation interval function;
s2: and controlling the working frequency of the compressor between the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor by combining the actual outlet water temperature.
As shown in fig. 2, in this embodiment, step S1 specifically includes:
s101: acquiring the actual environment temperature in real time by using an environment temperature sensor;
s102: acquiring the actual outlet water temperature in real time by using an outlet water sensor;
s103: acquiring the actual coil temperature in real time by using a coil temperature sensor;
s104: and acquiring the lowest frequency and the highest frequency of the compressor operation by utilizing the acquired actual environment temperature and the actual outlet water temperature value and combining a preset frequency operation interval function.
As shown in fig. 3, in the present scheme, the frequency operation interval function includes: a first relation function and a second relation function, and the specific process of step S104 is:
s1041: obtaining a first relation function by matching the protection operation power set by the compressor with the operation power of the compressor at different environmental temperatures and different water temperatures in a combined manner;
s1042: deducing a second relation function of the environment temperature, the water outlet temperature and the lowest frequency from the safety test data of the compressor; the safety test data is test data acquired by the compressor under different reference dimensions, wherein the reference dimensions comprise: actual demands of users at different ambient temperatures; the performance coefficient of the unit is greater than or equal to 1.0; the preset oil return standard of the compressor is met;
s1043: obtaining the lowest frequency and the highest frequency under the actual environment temperature and the actual water outlet temperature through a first relation function and a second relation function according to the actual environment temperature, the actual water outlet temperature and the coil temperature, and taking the region between the lowest frequency and the highest frequency as an operation frequency interval of the compressor;
s1044: and controlling the working frequency of the compressor within the operation frequency interval.
In this scheme, in step S1041, the protection operation power set by the compressor and the operation power of the compressor at different ambient temperatures and different water temperatures are matched to obtain a first relation function, which comprises the following specific processes:
the maximum permissible operating frequency is obtained by the formula of the operating power and the condensation temperature and the evaporation temperature of the compressor, which is as follows:
P＝a1+x*a2+y*a3+x.^2*a4+x*y*a5+y.^2*a6+x.^3*a7+y*x.^2*a8+x*y.^2*a9+y.^3*a10； (1)
Pmax＝Np (2)
wherein P represents the power of the compressor; x represents the evaporation temperature; y represents the condensation temperature; a1-a10 represents power coefficients; pmax represents the maximum allowable operating frequency; np represents a constant;
combining the formula 1 and the formula 2 to obtain the highest operation frequency, namely the allowed maximum operation frequency; table 1 shows the operating power table for the highest frequency C01.
TABLE 1
Wherein, the temperature arrangement sequence is as follows: tc1< Tc2< Tc3< Tc4< Tc5 Te1< Te2< Te3< Te4< Te 5;
power arrangement sequence: same ring temperature Te1, P11< P12< P13< P14< P15.
The maximum/medium frequency operating power curve is shown in fig. 4 as follows:
setting a product protection power, namely a maximum allowable power Pmax according to compressors with different displacements, as shown in the above fig. 4; when the maximum operation power exceeds the interval of the maximum operation power, the maximum operation frequency of the compressor can be reduced in advance; table 2 shows the table of the maximum frequency C01 after the maximum allowable power is set.
TABLE 2
In step S1042, the step of deriving the second relationship function between the ambient temperature and the lowest frequency from the safety test data of the compressor is specifically as follows:
the demands of the room on the heating capacity and the refrigerating capacity are met by the user at different environmental temperatures; according to the capacity coefficient of the compressor, the heating capacity of the compressor is obtained by calculation through a heating capacity formula (3), and the calculation formula is as follows:
Q＝(b1+x*b2+y*b3+x.^2*b4+x*y*b5+y.^2*b6+x.^3*b7+y*x.^2*b8+x*y.^2*b9+y.^3*b10)/3.415+p (3)
Quser＝-kT+c (4)
wherein Q represents the unit heating capacity; quser indicates that the user needs heat; k represents a ring temperature coefficient; t represents the ambient temperature; c represents a demand capability coefficient; b1 to b10 represent heating capacity coefficients.
As can be seen from the formulas 3 and 4, the heating capacity of the unit is in direct proportion to the ambient temperature; fig. 5 is a schematic diagram showing the relationship between the heating amount required by the user and the ambient temperature.
The heating quantity required by the user is inversely proportional to the ambient temperature;
temperature arrangement sequence: tc1< Tc2< Tc3< Tc4< Tc5 Te1< Te2< Te3< Te4< Te 5;
capacity ranking order: q11< Q12< Q13< Q14< Q15Q 11< Q21< Q31< Q41< Q51;
a table is used to further represent the relationship between the operating capacity of the compressor frequency and the actual demand capacity. Table 3 is an operation capability table of the compressor frequency, table 4 is a capability table of the actual demand of the user, and table 5 can be obtained by integrating the intersection of the actual operations of the formula 3 and the formula 4 with the table 2.
TABLE 3
TABLE 4
TABLE 5
A second aspect of the present invention provides a variable frequency interval control system, including: the control method program of the compressor operation frequency interval is executed by the processor to realize the following steps:
s1: acquiring the actual ambient temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and acquiring the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor through a preset frequency operation interval function;
s2: and controlling the working frequency of the compressor between the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor by combining the actual outlet water temperature.
A third aspect of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a program for a method for controlling an operating frequency interval of a compressor, and when the program for the method for controlling the operating frequency interval of the compressor is executed by a processor, the method for controlling the operating frequency interval of the compressor is implemented.
Example 2
In a specific embodiment, the compressor platform is started to operate, the actual ambient temperature and the actual outlet water temperature of the compressor unit are obtained in real time, the unit operation mode is determined, and when the unit is in a heating state, as shown in fig. 6, a schematic diagram of an environment temperature interval of the compressor in the heating state is shown.
The unit confirms the operation interval through outdoor ambient temperature under the heating state, and the interval operation is as follows: (when the line control of the tool is set, the gear 1 to 11 in the corresponding table 1 are directly set)
Table 6 shows a table of the maximum allowable frequency of the ring temperature interval from A to G, and Table 7 shows a table of the minimum allowable frequency of the ring temperature interval from A to G.
TABLE 6
TABLE 7
According to the table 6 and the table 7, the maximum allowable frequency and the minimum allowable frequency of each ring temperature interval corresponding to one of different outlet water temperature intervals can be obtained, and the operating frequency of the compressor is subjected to interval control according to the maximum allowable frequency and the minimum allowable frequency.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A control method for an operating frequency interval of a compressor is characterized by comprising the following steps:
s1: acquiring the actual ambient temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and acquiring the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor through a preset frequency operation interval function;
s2: and controlling the working frequency of the compressor between the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor by combining the actual outlet water temperature.
2. The method as claimed in claim 1, wherein the step S1 includes:
s101: acquiring the actual environment temperature in real time by using an environment temperature sensor;
s102: acquiring the actual outlet water temperature in real time by using an outlet water sensor;
s103: acquiring the actual coil temperature in real time by using a coil temperature sensor;
s104: and acquiring the lowest frequency and the highest frequency of the compressor operation by utilizing the acquired actual environment temperature and the actual outlet water temperature value and combining a preset frequency operation interval function.
3. A method as claimed in claim 1, wherein said frequency operation interval function comprises: a first relation function and a second relation function, and the specific process of step S104 is:
s1041: obtaining a first relation function by matching the protection operation power set by the compressor with the operation power of the compressor at different environmental temperatures and different water temperatures in a combined manner;
s1042: deducing a second relation function of the environment temperature, the water outlet temperature and the lowest frequency from the safety test data of the compressor; the safety test data is test data acquired by the compressor under different reference dimensions, wherein the reference dimensions comprise: actual demands of users at different ambient temperatures; the performance coefficient of the unit is greater than or equal to 1.0; the preset oil return standard of the compressor is met;
s1043: obtaining the lowest frequency and the highest frequency under the actual environment temperature and the actual water outlet temperature through a first relation function and a second relation function according to the actual environment temperature, the actual water outlet temperature and the coil temperature, and taking the region between the lowest frequency and the highest frequency as an operation frequency interval of the compressor;
s1044: and controlling the working frequency of the compressor within the operation frequency interval.
4. A control method of an operation frequency interval of a compressor according to claim 3,
in step S1041, the specific process of obtaining the first relation function by matching the protection operating power set by the compressor with the operating powers of the compressor at different environmental temperatures and different water temperatures by combining is as follows:
the maximum permissible operating frequency is obtained by the formula of the operating power and the condensation temperature and the evaporation temperature of the compressor, which is as follows:
P＝a1+x*a2+y*a3+x.^2*a4+x*y*a5+y.^2*a6+x.^3*a7+y*x.^2*a8+x*y.^2*a9+y.^3*a10；(1)
Pmax＝Np(2)
wherein P represents the power of the compressor; x represents the evaporation temperature; y represents the condensation temperature; a1-a10 represents power coefficients; pmax represents the maximum allowable operating frequency, which is determined according to the current value of the hardware module of the compressor group; np represents a constant;
combining the formula 1 and the formula 2 to obtain the highest operation frequency, namely the allowed maximum operation frequency;
step S1042, deducing a second relation function of the environment temperature, the water outlet temperature and the lowest frequency from the safety test data of the compressor, specifically;
the demands of the room on the heating capacity and the refrigerating capacity are met by the user at different environmental temperatures; according to the capacity coefficient of the compressor, the heating capacity of the compressor is obtained by calculation through a heating capacity formula (3), and the calculation formula is as follows:
Q＝(b1+x*b2+y*b3+x.^2*b4+x*y*b5+y.^2*b6+x.^3*b7+y*x.^2*b8+x*y.^2*b9+y.^3*b10)/3.415+p(3)
Quser＝-kT+c (4)
wherein Q represents the unit heating capacity; quser indicates that the user needs heat; k represents a ring temperature coefficient; t represents the ambient temperature; c represents a demand capability coefficient; b1 to b10 represent heating capacity coefficients.
5. A variable frequency range control system, comprising: the control method program of the compressor operation frequency interval is executed by the processor to realize the following steps:
s1: acquiring the actual ambient temperature, the coil temperature and the actual outlet water temperature of a compressor of the unit in real time, and acquiring the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor through a preset frequency operation interval function;
s2: and controlling the working frequency of the compressor between the frequency value of the highest frequency and the frequency value of the lowest frequency of the operation of the compressor by combining the actual outlet water temperature.
6. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a control method program of an operating frequency interval of a compressor, and when the control method program of the operating frequency interval of the compressor is executed by a processor, the steps of the control method of the operating frequency interval of the compressor according to any one of claims 1 to 4 are realized.
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