CN113294935B - Frequency adjusting method and device for heat pump frequency conversion unit - Google Patents

Frequency adjusting method and device for heat pump frequency conversion unit Download PDF

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CN113294935B
CN113294935B CN202110585174.9A CN202110585174A CN113294935B CN 113294935 B CN113294935 B CN 113294935B CN 202110585174 A CN202110585174 A CN 202110585174A CN 113294935 B CN113294935 B CN 113294935B
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input voltage
voltage value
frequency
heat pump
fluctuation
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CN113294935A (en
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赵密升
房金志
李建国
刘振乐
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Guangdong Newente New Energy Technology Co ltd
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Guangdong New Energy Technology Development 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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • 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 method and a device for adjusting the frequency of a heat pump frequency conversion unit, wherein the method comprises the following steps: acquiring an input voltage value of a heat pump frequency conversion unit according to a preset period; calculating a fluctuation amplitude of the input voltage value when the input voltage value fluctuates within a first predetermined period of time; adjusting the operating frequency of the heat pump frequency conversion unit at the current moment according to a first adjusting rate corresponding to the fluctuation amplitude, wherein the first adjusting rate is the frequency adjusting speed during frequency reduction; when the fluctuation amplitude of the input voltage does not exceed the corresponding preset voltage amplitude within the specified time, the operation frequency is adjusted back according to a preset second adjustment rate, and the second adjustment rate is the frequency recovery speed when the frequency limit is removed, so that the technical problem of sudden shutdown caused by the fact that the traditional heat pump frequency conversion unit is only set to be a fixed voltage value is solved, the problem of failure rate increase caused by shutdown of the heat pump frequency conversion unit due to unstable voltage is reduced, and the service life of equipment is prolonged.

Description

Frequency adjusting method and device for heat pump frequency conversion unit
Technical Field
The invention relates to the technical field of frequency adjustment of compressor units, in particular to a frequency adjustment method and device for a heat pump frequency conversion unit.
Background
With the improvement of living standard, the air source heat pump has been moved to thousands of households to become common household appliances in modern life, and the energy conservation and comfort of the air source heat pump become the focus of attention of users. Therefore, more and more users can select to use the more energy-saving variable frequency heat pump to adjust the room temperature or supply hot water, and the like, thereby creating more comfortable working and living environment.
The normal input voltage of the single-phase electrical equipment at the present stage is generally 198 VAC-242 VAC, and when the normal input voltage exceeds the voltage range, great potential safety hazards are caused to the unit. The existing control scheme generally protects the unit by detecting an alternating input voltage, an input current and a direct current bus voltage. If the AC input voltage or the input current or the DC bus voltage is lower than a certain value or higher than a certain value, the unit directly reports the fault and stops running.
However, in some areas with unstable voltage, if the use strategy is set to be that when the voltage is lower than a certain value or higher than a certain value, the unit directly alarms and stops, the daily use of a user is interrupted, and the experience is poor. If the voltage protection value is set to be too low, the running and starting currents are inevitably increased, and the situations of high temperature of a motor winding, insulation damage and burning, increase of line loss of a circuit and the like are easily caused; if set up too high with the voltage protection value then can accelerate unit equipment ageing, insulating reduction, serious then burns out equipment, and then leads to the security reduction that the user used.
Disclosure of Invention
The invention provides a frequency adjusting method and device for a heat pump frequency conversion unit, and solves the technical problem that in the prior art, due to the lack of flexibility in voltage protection value setting, the use safety of a user is reduced.
The invention provides a frequency adjusting method of a heat pump frequency conversion unit, which comprises the following steps:
acquiring an input voltage value of a heat pump frequency conversion unit according to a preset period;
calculating a fluctuation amplitude of the input voltage value when the input voltage value fluctuates within a first predetermined period of time;
adjusting the operating frequency of the heat pump frequency conversion unit at the current moment according to a first adjustment rate corresponding to the fluctuation amplitude;
and if the fluctuation rate of the input voltage value in a second preset time period is smaller than the rate threshold corresponding to the fluctuation amplitude, the operating frequency is adjusted back according to a preset second adjustment rate.
Optionally, the step of calculating the fluctuation amplitude of the input voltage value when the input voltage value fluctuates within a first predetermined time period includes:
when the input voltage value fluctuates in a first preset time period, acquiring the maximum voltage value and the minimum voltage value of the input voltage value in the first preset time period;
and calculating the difference value of the maximum voltage value and the minimum voltage value as the fluctuation amplitude of the input voltage value in a first preset time period.
Optionally, the step of adjusting the operating frequency of the heat pump inverter unit at the current moment according to the first adjustment rate corresponding to the fluctuation amplitude includes:
determining a target fluctuation interval where the fluctuation amplitude is located according to a matching result of the fluctuation amplitude and a plurality of preset fluctuation intervals;
acquiring a first adjustment rate corresponding to the target fluctuation interval;
and adjusting the current operating frequency of the heat pump frequency conversion unit at the current moment by adopting the first adjustment rate until the operating frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval.
Optionally, if the fluctuation rate of the input voltage value in the second predetermined period of time is smaller than the rate threshold corresponding to the fluctuation amplitude, the step of adjusting back the operating frequency according to a preset second adjustment rate includes:
if the fluctuation rate of the input voltage value in a second preset time period is smaller than the rate threshold value corresponding to the fluctuation amplitude, stopping adjusting the operating frequency of the heat pump frequency conversion unit according to the first adjustment rate; the speed threshold corresponding to the fluctuation amplitude is the interval minimum value of the target fluctuation interval;
and the operating frequency is adjusted back according to a preset second adjusting rate until the operating frequency at the current moment is adjusted.
Optionally, before the step of acquiring the input voltage value of the heat pump inverter group according to the predetermined period, the method further includes:
when the heat pump frequency conversion unit is electrified, acquiring the input voltage value in real time;
determining a preset input voltage interval according to the change trend of the input voltage value in a third preset time period;
and adjusting the operating frequency to a target operating frequency corresponding to the preset input voltage interval, and starting the heat pump frequency conversion unit.
The invention also provides a frequency adjusting device of the heat pump frequency conversion unit, which comprises:
the input voltage value acquisition module is used for acquiring the input voltage value of the heat pump frequency conversion unit according to a preset period;
the fluctuation amplitude calculation module is used for calculating the fluctuation amplitude of the input voltage value when the input voltage value fluctuates in a first preset time period;
the operation frequency adjusting module is used for adjusting the operation frequency of the heat pump frequency conversion unit at the current moment according to a first adjusting rate corresponding to the fluctuation amplitude;
and the operating frequency callback module is used for calling back the operating frequency according to a preset second adjustment rate if the fluctuation rate of the input voltage value in a second preset time period is smaller than a rate threshold corresponding to the fluctuation amplitude.
Optionally, the fluctuation amplitude calculation module includes:
the voltage maximum value acquisition submodule is used for acquiring the voltage maximum value and the voltage minimum value of the input voltage value in a first preset time period when the input voltage value fluctuates in the first preset time period;
and the amplitude calculation submodule is used for calculating the difference value of the maximum voltage value and the minimum voltage value as the fluctuation amplitude of the input voltage value in a first preset time period.
Optionally, the operating frequency adjusting module includes:
the target fluctuation interval determining submodule is used for determining a target fluctuation interval where the fluctuation amplitude is located according to the matching result of the fluctuation amplitude and a plurality of preset fluctuation intervals;
the first rate obtaining submodule is used for obtaining a first adjusting rate corresponding to the target fluctuation interval;
and the frequency adjusting submodule is used for adjusting the current operating frequency of the heat pump frequency conversion unit at the first adjusting rate until the operating frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval.
Optionally, the operating frequency callback module includes:
a stopping adjustment submodule, configured to stop adjusting the operating frequency of the heat pump frequency conversion unit according to the first adjustment rate if a fluctuation rate of the input voltage value in a second predetermined period is smaller than a rate threshold corresponding to the fluctuation amplitude; the speed threshold corresponding to the fluctuation amplitude is the minimum interval value of the target fluctuation interval;
and the call-back submodule is used for calling back the operating frequency according to a preset second adjustment rate until the operating frequency at the current moment is adjusted.
Optionally, the apparatus further comprises:
the real-time voltage value acquisition module is used for acquiring the input voltage value in real time when the heat pump frequency conversion unit is electrified;
the input voltage interval determining module is used for determining a preset input voltage interval according to the change trend of the input voltage value in a third preset time period;
and the target operating frequency adjusting module is used for adjusting the operating frequency to a target operating frequency corresponding to the preset input voltage interval and starting the heat pump frequency conversion unit.
According to the technical scheme, the invention has the following advantages:
the invention can collect the input voltage value of the heat pump frequency converter set according to the preset period, if the input voltage value has voltage fluctuation in the first preset period, the fluctuation amplitude of the voltage fluctuation can be calculated by adopting the input voltage value collected in the first preset period, the operating frequency of the heat pump frequency converter set at the current moment is gradually adjusted according to the first adjusting rate corresponding to the fluctuation amplitude, meanwhile, the input voltage value is continuously collected, if the fluctuation rate of the input voltage value in the second preset period is smaller than the rate threshold corresponding to the fluctuation amplitude, the adjusted operating frequency can be adjusted back according to the second adjusting rate, so as to solve the technical problem of sudden shutdown caused by the fact that the traditional heat pump frequency converter set only sets a fixed voltage value, reduce the problem of failure rate rise caused by shutdown due to voltage instability of the heat pump frequency converter set and prolong the service life of equipment.
Drawings
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 embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a flowchart illustrating steps of a frequency adjustment method for a heat pump inverter unit according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a frequency adjustment method for a heat pump inverter unit according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating steps of a frequency adjustment method for a heat pump inverter unit according to a third embodiment of the present invention;
fig. 4 is a block diagram of a frequency adjustment device of a heat pump inverter unit according to a fourth embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a frequency adjusting method and device for a heat pump frequency conversion unit, which are used for solving the technical problem that in the prior art, the use safety of a user is reduced due to the lack of flexibility in voltage protection value setting.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for adjusting a frequency of a heat pump inverter set according to an embodiment of the present invention.
The invention provides a frequency adjusting method of a heat pump frequency conversion unit, which comprises the following steps:
step 101, collecting an input voltage value of a heat pump frequency conversion unit according to a preset period;
the heat pump frequency conversion unit is a unit which mainly comprises a refrigeration compressor, a condenser, an air cooler, an electromagnetic valve, a frequency converter and the like, and is additionally provided with an oil separator, a liquid storage barrel, an oil sight glass, a diaphragm type hand valve, an air return filter and the like.
In the embodiment of the invention, in order to accurately monitor the voltage fluctuation of the heat pump frequency conversion unit, the input voltage value of the heat pump frequency conversion unit can be acquired according to a preset period.
Step 102, when the input voltage value fluctuates in a first preset time period, calculating the fluctuation amplitude of the input voltage value;
when the input voltage value is detected to fluctuate within the first preset time period, which indicates that the input voltage is unstable at the moment and may cause the shutdown of the heat pump frequency conversion unit, the fluctuation amplitude of the input voltage value within the first preset time period can be calculated based on the input voltage value collected within the first preset time period.
In order to reduce the false determination probability while ensuring higher accuracy, the first predetermined period may be set to be an integral multiple of the predetermined period, for example, the first predetermined period may be set to 1s, and the predetermined period is set to 1 ms.
103, adjusting the current operating frequency of the heat pump frequency conversion unit according to a first adjustment rate corresponding to the fluctuation amplitude;
in the embodiment of the invention, each fluctuation amplitude value can be associated with a first adjustment rate, and after the fluctuation amplitude value of the input voltage value in a first preset time period is obtained through calculation, the current operating frequency of the heat pump frequency conversion unit can be adjusted according to the first adjustment rate corresponding to the fluctuation amplitude value, so that the heat pump frequency conversion unit can be maintained to operate under the condition of unstable voltage.
And 104, if the fluctuation rate of the input voltage value in the second preset time period is less than the rate threshold corresponding to the fluctuation amplitude, adjusting back the operating frequency according to a preset second adjustment rate.
And when the operating frequency of the heat pump frequency conversion unit is adjusted, the input voltage value is continuously obtained according to a preset period so as to ensure the real-time adjustment of the operating frequency. Further, when a plurality of input voltage values of the second predetermined period of time are acquired, the calculation of the fluctuation rate of the input voltage values within the second predetermined period of time may be performed with the plurality of input voltage values and the second predetermined period of time. If the fluctuation rate is smaller than the rate threshold corresponding to the fluctuation amplitude, it is indicated that the voltage at the moment is stable, and at the moment, the operation frequency can be adjusted back according to a preset second adjustment rate, so as to recover the operation state of the heat pump frequency conversion unit before the adjustment of the first adjustment rate.
The second predetermined period of time is an integral multiple of the first predetermined period of time, for example, the first predetermined period of time is 1s, and the second predetermined period of time is 10 minutes, which is not limited in this embodiment of the present invention.
In the embodiment of the invention, the input voltage value of the heat pump frequency converter unit can be collected according to a preset period, if the input voltage value has voltage fluctuation in a first preset period, the fluctuation amplitude of the voltage fluctuation can be calculated by adopting the input voltage value collected in the first preset period, the operating frequency of the heat pump frequency converter unit at the current moment is gradually adjusted according to a first adjustment rate corresponding to the fluctuation amplitude, meanwhile, the input voltage value is continuously collected, if the fluctuation rate of the input voltage value in a second preset period is smaller than a rate threshold corresponding to the fluctuation amplitude, the adjusted operating frequency can be adjusted back according to a second adjustment rate, so that the technical problem of sudden shutdown caused by the fact that the traditional heat pump frequency converter unit is only provided with a fixed voltage value is solved, the problem of failure rate increase of the heat pump frequency converter unit due to unstable voltage shutdown is reduced, and the service life of equipment is prolonged.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for adjusting a frequency of a heat pump inverter set according to a second embodiment of the present invention.
The invention provides a frequency adjusting method of a heat pump frequency conversion unit, which comprises the following steps:
step 201, collecting an input voltage value of a heat pump frequency conversion unit according to a preset period;
the heat pump frequency conversion unit is a unit mainly composed of a refrigeration compressor, a condenser, an air cooler, an electromagnetic valve, a frequency converter and the like, and is additionally provided with an oil separator, a liquid storage barrel, an oil sight glass, a diaphragm type hand valve, an air return filter and the like.
In the embodiment of the invention, in order to accurately monitor the voltage fluctuation of the heat pump frequency conversion unit, the input voltage value of the heat pump frequency conversion unit can be acquired according to a preset period.
The predetermined period may be set to 1ms or 0.5ms, and may be specifically set according to an actual situation, which is not limited in this embodiment of the present invention.
Optionally, before step 201, the method may further comprise the following steps S11-S13:
s11, when the heat pump frequency conversion unit is electrified, acquiring an input voltage value in real time;
s12, determining a preset input voltage interval according to the change trend of the input voltage value in a third preset time period;
and S13, adjusting the operating frequency to a target operating frequency corresponding to the preset input voltage interval, and starting the heat pump frequency conversion unit.
In specific implementation, when a heat pump frequency conversion unit is powered on, for example, when an air conditioner is powered on, because the input voltage value has different variation trends during access, the input voltage value can be acquired in real time at the moment; determining a preset input voltage interval in which the input voltage value is positioned according to the change trend of the input voltage value in the third preset time period and the voltage stabilization value when the input voltage value is stable; and finally, adjusting the operating frequency of the heat pump frequency conversion unit to a target operating frequency corresponding to the preset input voltage interval.
The third predetermined period refers to a period from unstable input voltage to stable input voltage, and there may be a plurality of preset input voltage intervals.
If the variation trend of the input voltage value in the third predetermined period of time is an increasing trend, the corresponding relationship between the input voltage value and the target operating frequency of the preset input voltage interval may be as shown in table 1 below:
Figure BDA0003087834090000071
Figure BDA0003087834090000081
TABLE 1
If the variation trend of the input voltage value in the third predetermined period is a decreasing trend, the corresponding relationship between the input voltage value and the target operating frequency of the preset input voltage interval may be as shown in table 2 below:
presetting an input voltage interval Highest frequency of refrigeration (Hz) Heating highest frequency (Hz)
265V < input voltage 0 0
Input voltage is more than 255V and less than or equal to 265V 50 55
245V < input voltage ≤ 255V 65 70
Input voltage is more than 235V and less than or equal to 245V 80 85
Input voltage is more than 195V and less than or equal to 235V 95 100
Input voltage is more than 185V and less than or equal to 195V 95 100
Input voltage is more than 175V and less than or equal to 185V 75 80
Input voltage is more than 165V and less than or equal to 175V 60 65
Input voltage more than 155V and less than or equal to 165V 45 50
145V < input voltage ≤ 155V 40 45
Input voltage is less than or equal to 145V 0 0
TABLE 2
Step 202, when the input voltage value fluctuates in a first preset time period, calculating the fluctuation amplitude of the input voltage value;
optionally, step 202 may comprise the following sub-steps S21-S22:
s21, when the input voltage value fluctuates in a first preset time period, acquiring the maximum voltage value and the minimum voltage value of the input voltage value in the first preset time period;
and S22, calculating the difference value of the maximum voltage value and the minimum voltage value as the fluctuation amplitude of the input voltage value in the first preset time period.
In the embodiment of the invention, if the input voltage value fluctuates in the first preset time period, the maximum voltage value and the minimum voltage value of the input voltage value in the first preset time period can be obtained, and then the difference value between the maximum voltage value and the minimum voltage value is calculated to be used as the fluctuation amplitude of the input voltage value in the first preset time period, so as to provide a data basis for subsequent operation frequency adjustment.
Step 203, determining a target fluctuation interval where the fluctuation amplitude is located according to the matching result of the fluctuation amplitude and a plurality of preset fluctuation intervals;
in the embodiment of the present invention, after the fluctuation amplitude within the first predetermined time period is obtained through calculation, the target fluctuation interval in which the fluctuation amplitude is located may be determined according to the result of matching the fluctuation amplitude with a plurality of preset fluctuation intervals.
It is worth mentioning that the preset fluctuation interval can include, but is not limited to (0,5 ], (5, 10], (10, 15], (15, 20], and (20, + ∞), etc.
Step 204, acquiring a first adjustment rate corresponding to a target fluctuation interval;
in a specific implementation, different fluctuation intervals respectively correspond to different first adjustment rates, and after a target fluctuation interval is determined, the corresponding first adjustment rate may be obtained based on the target fluctuation interval.
For example, in the case where the fluctuation amplitude is 9, the target fluctuation interval is (5, 10), and at this time, the first adjustment rate 1Hz/s corresponding to (5, 10) may be obtained.
Step 205, adjusting the current operating frequency of the heat pump frequency conversion unit at the first adjustment rate until the operating frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval;
in the embodiment of the invention, after the first adjustment rate is obtained, the operation frequency of the heat pump frequency conversion unit at the current moment can be adjusted by adopting the first adjustment rate until the operation frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval.
It is worth mentioning that the corresponding relationship among the fluctuation interval, the first adjustment rate and the lowest frequency value is as follows
Shown in Table 3:
Figure BDA0003087834090000091
Figure BDA0003087834090000101
TABLE 3
Taking the refrigeration mode of the heat pump frequency conversion unit as an example, when the mutation of the input voltage in 1S is more than or equal to 5V, the operating frequency of the heat pump frequency conversion unit is reduced to the original frequency of-5 Hz at the rate of 1Hz/S, and is reduced to 60Hz at the lowest.
And step 206, if the fluctuation rate of the input voltage value in the second preset time period is smaller than the rate threshold corresponding to the fluctuation amplitude, the operating frequency is adjusted back according to a preset second adjustment rate.
Further, step 206 may comprise the following sub-steps S31-S32:
s31, if the fluctuation rate of the input voltage value in the second preset time period is smaller than the rate threshold value corresponding to the fluctuation amplitude, stopping adjusting the operating frequency of the heat pump frequency conversion unit according to the first adjustment rate; the speed threshold corresponding to the fluctuation amplitude is the minimum interval value of the target fluctuation interval;
and S32, the running frequency is adjusted back according to a preset second adjusting rate until the running frequency at the current moment is adjusted.
In one example of the present invention, it is possible to continue to acquire the input voltage value at a predetermined cycle and calculate the fluctuation rate using the entire input voltage value and the second predetermined period when the predetermined cycle satisfies the second predetermined period. At this time, if the fluctuation rate is smaller than the rate threshold corresponding to the fluctuation amplitude, the operation frequency of the heat pump frequency conversion unit can be stopped being adjusted by adopting the first adjustment rate, and then the operation frequency can be adjusted back according to the preset second adjustment rate until the operation frequency is adjusted to the initial state.
The velocity threshold corresponding to the fluctuation amplitude is the minimum interval value of the target fluctuation interval, for example, if the fluctuation amplitude is 9, the target fluctuation interval is (5, 10), and the velocity threshold is 5V/s.
In the embodiment of the invention, the input voltage value of the heat pump frequency converter unit can be collected according to a preset period, if the input voltage value has voltage fluctuation in a first preset period, the fluctuation amplitude of the voltage fluctuation can be calculated by adopting the input voltage value collected in the first preset period, the operating frequency of the heat pump frequency converter unit at the current moment is gradually adjusted according to a first adjustment rate corresponding to the fluctuation amplitude, meanwhile, the input voltage value is continuously collected, if the fluctuation rate of the input voltage value in a second preset period is smaller than a rate threshold corresponding to the fluctuation amplitude, the adjusted operating frequency can be adjusted back according to a second adjustment rate, so that the technical problem of sudden shutdown caused by the fact that the traditional heat pump frequency converter unit is only provided with a fixed voltage value is solved, the problem of failure rate increase of the heat pump frequency converter unit due to unstable voltage shutdown is reduced, and the service life of equipment is prolonged.
As shown in fig. 3, fig. 3 is a flowchart illustrating steps of a frequency adjustment method for a heat pump inverter unit according to a third embodiment of the present invention;
1) Acquiring an input voltage value of the heat pump frequency conversion unit every 10 ms;
2) Calculating the difference value of the maximum voltage value and the minimum voltage value of the input voltage in every 1s as a fluctuation amplitude value;
3) If the fluctuation amplitude is less than 5V, the frequency of the heat pump frequency conversion unit is not adjusted; if the fluctuation amplitude is less than 10V and less than or equal to 5V, downloading the data to the running frequency of-5 Hz according to a first adjusting rate of 1Hz/s, wherein the lowest value can refer to a table 3; if the voltage is not suddenly changed within 10 minutes and is more than or equal to 5V/s, canceling the voltage fluctuation frequency limitation, and then recovering the previous state at the rate of 1 Hz/s;
4) If the fluctuation amplitude is more than or equal to 10V and less than 15V, downloading the voltage to the operation frequency of minus 10Hz at a first regulation rate of 2Hz/s, wherein the lowest value can refer to a table 3, and if the voltage does not mutate within 10 minutes and is more than or equal to 10V/s, canceling the voltage fluctuation frequency limitation and then restoring the previous state at the rate of 1 Hz/s;
5) If the fluctuation amplitude is less than or equal to 15V and less than 20V, downloading the voltage to the running frequency of-30 Hz at a first adjusting rate of 5Hz/s, wherein the lowest value can refer to the table 3, and if the voltage does not suddenly change within 10 minutes and is more than or equal to 15V/s, canceling the voltage fluctuation frequency limitation, and then recovering the previous state at the rate of 1 Hz/s;
6) If the fluctuation amplitude is less than or equal to 20V, downloading the voltage to the running frequency of-5 Hz at a first regulation rate of 7Hz/s, wherein the lowest value can refer to the table 3, and if the voltage does not suddenly change within 10 minutes and is more than or equal to 20V/s, canceling the voltage fluctuation frequency limitation, and then recovering the previous state at the rate of 1Hz/s.
The voltage fluctuation frequency limitation refers to a process of gradually adjusting the operating frequency of the heat pump frequency conversion unit at the current moment according to a first adjustment rate corresponding to the fluctuation amplitude.
Referring to fig. 4, fig. 4 is a block diagram of a frequency adjustment device of a heat pump frequency converter set according to a fourth embodiment of the present invention.
The embodiment of the invention provides a frequency adjusting device of a heat pump frequency conversion unit, which comprises:
the input voltage value acquisition module 401 is used for acquiring an input voltage value of the heat pump frequency conversion unit according to a preset period;
a fluctuation amplitude calculation module 402, configured to calculate a fluctuation amplitude of the input voltage value when the input voltage value fluctuates within a first predetermined time period;
the operating frequency adjusting module 403 is configured to adjust the operating frequency of the heat pump frequency conversion unit at the current moment according to a first adjustment rate corresponding to the fluctuation amplitude;
and an operation frequency callback module 404, configured to, if the fluctuation rate of the input voltage value in the second predetermined time period is smaller than the rate threshold corresponding to the fluctuation amplitude, callback the operation frequency according to a preset second adjustment rate.
Optionally, the fluctuation amplitude calculation module 402 includes:
the voltage maximum value acquisition submodule is used for acquiring the voltage maximum value and the voltage minimum value of the input voltage value in a first preset time period when the input voltage value fluctuates in the first preset time period;
and the amplitude calculation submodule is used for calculating the difference value of the maximum voltage value and the minimum voltage value as the fluctuation amplitude of the input voltage value in the first preset time period.
Optionally, the operating frequency adjusting module 403 includes:
the target fluctuation interval determining submodule is used for determining a target fluctuation interval where the fluctuation amplitude is located according to the matching result of the fluctuation amplitude and a plurality of preset fluctuation intervals;
the first rate obtaining submodule is used for obtaining a first adjusting rate corresponding to the target fluctuation interval;
and the frequency adjusting submodule is used for adjusting the current operating frequency of the heat pump frequency conversion unit at the first adjusting rate until the operating frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval.
Optionally, the running frequency callback module 404 includes:
the stopping adjustment submodule is used for stopping adjusting the operation frequency of the heat pump frequency conversion unit according to the first adjustment rate if the fluctuation rate of the input voltage value in the second preset time period is smaller than the rate threshold value corresponding to the fluctuation amplitude; wherein, the rate threshold value corresponding to the fluctuation amplitude is the interval minimum value of the target fluctuation interval;
and the call-back submodule is used for calling back the running frequency according to a preset second adjusting rate until the running frequency at the current moment is adjusted.
Optionally, the apparatus further comprises:
the real-time voltage value acquisition module is used for acquiring an input voltage value in real time when the heat pump frequency conversion unit is electrified;
the input voltage interval determining module is used for determining a preset input voltage interval according to the change trend of the input voltage value in a third preset time period;
and the target operating frequency adjusting module is used for adjusting the operating frequency to a target operating frequency corresponding to the preset input voltage interval and starting the heat pump frequency conversion unit.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A frequency adjusting method for a heat pump frequency conversion unit is characterized by comprising the following steps:
acquiring an input voltage value of a heat pump frequency conversion unit according to a preset period;
calculating a fluctuation amplitude of the input voltage value when the input voltage value fluctuates within a first predetermined period of time;
adjusting the operating frequency of the heat pump frequency conversion unit at the current moment according to a first adjustment rate corresponding to the fluctuation amplitude;
if the fluctuation rate of the input voltage value in a second preset time period is smaller than the rate threshold value corresponding to the fluctuation amplitude, the operating frequency is adjusted back according to a preset second adjustment rate;
the step of calculating the fluctuation amplitude of the input voltage value when the input voltage value fluctuates within a first predetermined period of time includes:
when the input voltage value fluctuates in a first preset time period, acquiring the maximum voltage value and the minimum voltage value of the input voltage value in the first preset time period;
and calculating the difference value of the maximum voltage value and the minimum voltage value as the fluctuation amplitude of the input voltage value in a first preset time period.
2. The method for adjusting the frequency of the heat pump inverter unit according to claim 1, wherein the step of adjusting the operating frequency of the heat pump inverter unit at the current time according to the first adjustment rate corresponding to the fluctuation amplitude includes:
determining a target fluctuation interval in which the fluctuation amplitude is located according to a matching result of the fluctuation amplitude and a plurality of preset fluctuation intervals;
acquiring a first adjustment rate corresponding to the target fluctuation interval;
and adjusting the current operating frequency of the heat pump frequency conversion unit at the current moment by adopting the first adjustment rate until the operating frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval.
3. The method for adjusting the frequency of the heat pump inverter unit according to claim 2, wherein if the fluctuation rate of the input voltage value in the second predetermined period of time is smaller than the rate threshold corresponding to the fluctuation amplitude, the step of adjusting the operating frequency back according to a preset second adjustment rate includes:
if the fluctuation rate of the input voltage value in a second preset time period is smaller than the rate threshold value corresponding to the fluctuation amplitude, stopping adjusting the operating frequency of the heat pump frequency conversion unit according to the first adjustment rate; the speed threshold corresponding to the fluctuation amplitude is the minimum interval value of the target fluctuation interval;
and the operating frequency is adjusted back according to a preset second adjusting rate until the operating frequency at the current moment is adjusted.
4. The frequency adjustment method for the heat pump inverter group according to any one of claims 1 to 3, wherein before the step of collecting the input voltage value of the heat pump inverter group according to the predetermined period, the method further comprises:
when the heat pump frequency conversion unit is electrified, acquiring the input voltage value in real time;
determining a preset input voltage interval according to the change trend of the input voltage value in a third preset time period;
and adjusting the operating frequency to a target operating frequency corresponding to the preset input voltage interval, and starting the heat pump frequency conversion unit.
5. The utility model provides a heat pump frequency conversion unit frequency adjusting device which characterized in that includes:
the input voltage value acquisition module is used for acquiring the input voltage value of the heat pump frequency conversion unit according to a preset period;
the fluctuation amplitude calculation module is used for calculating the fluctuation amplitude of the input voltage value when the input voltage value fluctuates in a first preset time period;
the operation frequency adjusting module is used for adjusting the operation frequency of the heat pump frequency conversion unit at the current moment according to a first adjusting rate corresponding to the fluctuation amplitude;
the operation frequency callback module is used for calling back the operation frequency according to a preset second adjustment rate if the fluctuation rate of the input voltage value in a second preset time period is smaller than the rate threshold corresponding to the fluctuation amplitude;
the fluctuation amplitude calculation module includes:
the voltage maximum value acquisition submodule is used for acquiring the voltage maximum value and the voltage minimum value of the input voltage value in a first preset time period when the input voltage value fluctuates in the first preset time period;
and the amplitude calculation submodule is used for calculating the difference value of the maximum voltage value and the minimum voltage value as the fluctuation amplitude of the input voltage value in a first preset time period.
6. The frequency adjustment device of the heat pump inverter group according to claim 5, wherein the operating frequency adjustment module comprises:
the target fluctuation interval determining submodule is used for determining a target fluctuation interval where the fluctuation amplitude is located according to the matching result of the fluctuation amplitude and a plurality of preset fluctuation intervals;
the first rate obtaining submodule is used for obtaining a first adjusting rate corresponding to the target fluctuation interval;
and the frequency adjusting submodule is used for adjusting the current operating frequency of the heat pump frequency conversion unit at the first adjusting rate until the operating frequency is adjusted to the lowest frequency value corresponding to the target fluctuation interval.
7. The frequency adjustment device of the heat pump inverter group according to claim 6, wherein the operation frequency adjustment module comprises:
a stopping adjustment submodule, configured to stop adjusting the operating frequency of the heat pump frequency conversion unit according to the first adjustment rate if a fluctuation rate of the input voltage value in a second predetermined period is smaller than a rate threshold corresponding to the fluctuation amplitude; the speed threshold corresponding to the fluctuation amplitude is the minimum interval value of the target fluctuation interval;
and the call-back submodule is used for calling back the operating frequency according to a preset second adjustment rate until the operating frequency at the current moment is adjusted.
8. The frequency adjustment device of the heat pump inverter group according to any one of claims 5 to 7, further comprising:
the real-time voltage value acquisition module is used for acquiring the input voltage value in real time when the heat pump frequency conversion unit is electrified;
the input voltage interval determining module is used for determining a preset input voltage interval according to the change trend of the input voltage value in a third preset time period;
and the target operating frequency adjusting module is used for adjusting the operating frequency to a target operating frequency corresponding to the preset input voltage interval and starting the heat pump frequency conversion unit.
CN202110585174.9A 2021-05-27 2021-05-27 Frequency adjusting method and device for heat pump frequency conversion unit Active CN113294935B (en)

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Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626695A (en) * 1992-07-07 1994-02-04 Fujitsu General Ltd Controller of air conditioner
ES2212016T3 (en) * 1993-11-09 2004-07-16 Sanyo Electric Co. Ltd AIR CONDITIONING DEVICE USED WITH A LARGE RANGE OF VOLTAGE SOURCES.
JPH07332740A (en) * 1994-06-03 1995-12-22 Toshiba Corp Operation control method of air conditioner
JP3254922B2 (en) * 1994-09-16 2002-02-12 松下電器産業株式会社 Inverter device for air conditioning
JP2000041397A (en) * 1998-07-22 2000-02-08 Matsushita Refrig Co Ltd Vibration alleviating apparatus for air conditioner
CN101162871B (en) * 2007-09-28 2012-01-25 艾默生网络能源有限公司 Method for prompting the accommodating range of air conditioner to electric network electric voltage and frequency, and device thereof
CN102486330B (en) * 2010-12-03 2014-07-23 湖南大学 Intelligent air-conditioner adjusting device based on active security response of user
CN202470417U (en) * 2012-02-03 2012-10-03 广东纽恩泰新能源科技发展有限公司 Commercial water heating device with air source heat pump and adjustability in power level
CN103219940A (en) * 2012-11-01 2013-07-24 东方日立(成都)电控设备有限公司 Suppression method of electromotor vibration
US10050576B2 (en) * 2015-02-19 2018-08-14 Mitsubishi Electric Corporation Inverter control device and air conditioner
CN106918121A (en) * 2017-03-31 2017-07-04 广东美的制冷设备有限公司 Air-conditioner and its control method and device
CN107449192B (en) * 2017-07-28 2019-12-20 广东美的制冷设备有限公司 Frequency adjusting method and device of variable frequency compressor and readable storage medium
CN110864408B (en) * 2018-08-08 2021-09-24 青岛海尔空调器有限总公司 Air conditioner and control method thereof
CN109539496B (en) * 2018-10-19 2021-07-23 重庆海尔空调器有限公司 Air conditioner self-adaptive control method and air conditioner
CN110701828B (en) * 2019-10-21 2021-09-21 广东美的暖通设备有限公司 Control method and system of compressor, compressor assembly, air conditioner and storage medium
CN111219847A (en) * 2019-12-06 2020-06-02 宁波奥克斯电气股份有限公司 Method and device for avoiding abnormal shutdown of air conditioner due to sudden change of voltage and air conditioner
CN111894840B (en) * 2020-07-28 2021-10-26 珠海格力电器股份有限公司 Compressor out-of-step prevention circuit, control method and air conditioner
CN112393463A (en) * 2020-11-18 2021-02-23 广东纽恩泰新能源科技发展有限公司 Self-adaptive adjustment method for temperature probe fault of air source heat pump system
CN112600485B (en) * 2020-12-29 2023-05-16 广东美的白色家电技术创新中心有限公司 Control method and device of variable frequency drive device and storage medium

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