CN111609551A - Heat pump system voltage self-adaptive control method and heat pump system - Google Patents
Heat pump system voltage self-adaptive control method and heat pump system Download PDFInfo
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- CN111609551A CN111609551A CN201910138633.1A CN201910138633A CN111609551A CN 111609551 A CN111609551 A CN 111609551A CN 201910138633 A CN201910138633 A CN 201910138633A CN 111609551 A CN111609551 A CN 111609551A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000003044 adaptive effect Effects 0.000 claims description 21
- 238000004378 air conditioning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a heat pump system and a voltage self-adaptive control method thereof, wherein the heat pump system comprises the following steps: dividing the voltage into a plurality of working intervals according to the rated input voltage, wherein the working intervals at least comprise a safe working interval; (1) detecting an input voltage, and comparing and judging the input voltage with a rated input voltage; (2) and if the input voltage is in the safe working interval, heating the water in the water tank according to a preset control logic, otherwise, detecting the actual water temperature, comparing and judging the actual water temperature with the set temperature, and adjusting the running state of the compressor according to the judgment result. The control method of the invention combines the water temperature condition in the water tank, sets the low-pressure working interval and the high-pressure working interval, namely, under the condition of meeting a certain water temperature, when the input voltage is higher than the safe working interval or lower than the safe working interval within a certain range, the compressor can still keep safe operation, and the discomfort brought to users due to frequent shutdown can be avoided.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a self-adaptive control method for the voltage of a heat pump system.
Background
At present, due to the fact that a power utilization peak period and a power utilization low peak period exist, certain influence is caused on voltage in a power grid, the problem that the voltage is too high or too low can occur, the 220V power supply voltage sometimes reaches 270V-280V, sometimes is lower than 168V, and when the voltage exceeds the safe working voltage range of an air source heat pump, a heat pump system is easily damaged. In order to solve the technical problem that high voltage and low voltage have damage to the system, the existing heat pump unit is provided with a power supply protector, and the machine is protected to be shut down and protected when the power supply voltage of the unit is too low or too high, so that the unit cannot be continuously and normally used, and the user experience is poor.
Disclosure of Invention
The invention provides a heat pump system voltage self-adaptive control method, which aims to solve the technical problems that a machine is protected to stop when the power supply voltage is too low or too high in the conventional heat pump system, so that a unit cannot be used normally continuously, and the use experience of a user is poor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a heat pump system voltage adaptive control method comprises the following steps:
dividing the voltage into a plurality of working intervals according to the rated input voltage, wherein the working intervals at least comprise a safe working interval;
(1) detecting an input voltage, and comparing and judging the input voltage with a rated input voltage;
(2) and if the input voltage is in the safe working interval, heating the water in the water tank according to a preset control logic, otherwise, detecting the actual water temperature, comparing and judging the actual water temperature with the set temperature, and adjusting the running state of the compressor according to the judgment result.
Further, the voltage working interval further includes a low-voltage working interval and a high-voltage working interval, wherein the value in the safety working interval is greater than the value in the low-voltage working interval and is less than the value in the high-voltage working interval, and in the step (2), if the input voltage is less than the minimum value in the low-voltage working interval, the compressor is turned off.
Further, in the step (2), if the input voltage is smaller than the minimum value in the low-voltage working interval, the step of judging the time from the last time of closing the compressor is further included, if the time from the last time of closing the compressor is not less than t1, the compressor is closed, and an adaptive low-voltage alarm prompt is sent, wherein t1 is more than 1min and less than 3 min.
Further, in the step (2), if the input voltage is in the low-pressure working range and the actual water temperature is less than the set temperature-C1, the current running state of the compressor is maintained, and a self-adaptive low-pressure alarm prompt is sent, wherein C1 is greater than 0.
Further, in the step (2), if the input voltage is in the low-voltage working range and the actual water temperature is less than the set temperature-C1, the method further comprises the step of judging the time from the last time of starting the compressor, if the time from the last time of starting the compressor is more than or equal to t2, the current running state of the compressor is kept, otherwise, the compressor is closed, wherein t2 is more than 1min and less than 3 min.
Further, if the input voltage is in a high-voltage working interval, and the set temperature + C2 is larger than the actual water temperature and is smaller than the set temperature + C2+ delta T, the current running state of the compressor is kept, and self-adaptive high-voltage alarm prompt is sent out, wherein C2 is larger than 0, and delta T is larger than 0.
Further, if the input voltage is larger than the maximum value of the high-voltage working interval, and the set temperature + C2 is larger than the actual water temperature and is smaller than the set temperature + C2+ delta T, the current running state of the compressor is kept, and self-adaptive high-voltage alarm prompt is carried out, wherein C2 is larger than 0, and delta T is larger than 0.
Further, if the input voltage is larger than the maximum value of the high-voltage working interval, the set temperature + C2 is larger than the actual water temperature and is smaller than the set temperature + C2+ delta T, the method further comprises the step of judging the starting time of the compressor last time, if the starting time of the compressor last time is larger than or equal to T3, the current running state of the compressor is kept, and self-adaptive high-voltage alarm prompt is carried out, wherein C2 is larger than 0, delta T is larger than 0, and T3 is larger than 1min and is smaller than 3 min.
Further, if the actual water temperature is greater than or equal to the set temperature + C2 +. DELTA.T, the compressor is turned off.
A heat pump system comprising at least one compressor that performs adaptive control according to the heat pump system voltage adaptive control method of any of the preceding claims.
Compared with the prior art, the invention has the advantages and positive effects that: the method for self-adaptive control of the voltage of the heat pump system comprises the steps of dividing a plurality of working intervals of input voltage, controlling the compressor to be in an operation state or a shutdown state only according to a unique judgment interval, setting a low-pressure working interval and a high-pressure working interval according to the water temperature condition in the water tank, namely, under the condition of meeting a certain water temperature, enabling the compressor to still keep operating when the input voltage is higher than the safe working interval or lower than the safe working interval within a certain range, and enabling the current heat pump unit to be in safe operation by adjusting the startup number of the compressor when a plurality of compressors work.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
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 description of the embodiments or 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 creative efforts.
Fig. 1 is a flowchart of an embodiment of a method for adaptive control of a heat pump system voltage according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is to solve the technical problem that the existing heat pump system has damage to the system due to high voltage and low voltage, and the problem that the unit cannot be continuously and normally used and the user experience is poor due to the fact that the machine is protected to be shut down when the unit power supply voltage is too low or too high. The embodiment provides a heat pump system voltage self-adaptive control method, a compressor adopted in a heat pump system in the embodiment is especially directed at a fixed-frequency compressor, when the voltage of an input power supply is too high or too low, the fixed-frequency compressor cannot adjust the power of the compressor by adjusting the working frequency so as to reduce the influence of the too high or too low voltage on a unit, wherein the heat pump system can be a heat pump air conditioning system, a heat pump heating furnace, a heat pump water heater system and the like, the energy obtaining source of the heat pump system can be an air energy heat pump, a solar heat pump, a geothermal energy heat pump and the like, and the self-adaptive control method adopting the scheme belongs to the protection range of the patent no matter which heat pump system is used.
The self-adaptive control method for the voltage of the heat pump system comprises the following steps:
dividing the voltage into a plurality of working intervals according to the rated input voltage, wherein the working intervals at least comprise a safe working interval;
s1, detecting the input voltage, and comparing and judging the input voltage with the rated input voltage;
in this embodiment, the input voltage detection may be implemented by using a voltage transmitter, which collects a voltage value of the power grid, that is, an input voltage of the compressor.
When the input voltage is detected, in order to prevent short-time fluctuation of the voltage in the power grid from influencing a detection result, the input voltage needs to be continuously detected for a period of time, and a value which can most reflect the actual input voltage is obtained as the input voltage by taking an average value or other modes so as to prevent system misjudgment.
And S2, if the input voltage is in the safe working interval, heating the water in the water tank according to a preset control logic, otherwise, detecting the actual water temperature, comparing and judging the actual water temperature with the set temperature, and adjusting the running state of the compressor according to the judgment result.
Dividing a safe working interval, a low-voltage working interval and a high-voltage working interval of input voltage; as a preferred embodiment, the division of the working interval in this embodiment takes the rated working voltage V0 as a reference, and the safe working interval is: [ 93%. V0, 107%. V0], low-pressure operating interval: [91% V0, 93% V0), the high pressure operating interval is: (107% V0, 109% V0). After the compressor is powered on and operated, the method comprises the following steps:
in step S2, if the input voltage is in the safe operating region, heating the water in the water tank according to a preset control logic, and if the input voltage is in the low-pressure operating region or the high-pressure operating region, detecting an actual water temperature, comparing the actual water temperature with a set temperature, and adjusting the operating state of the compressor according to the result of the determination.
Wherein, heating the water in the water tank according to a preset control logic comprises: and in the starting stage, if the voltage meets the conditions, starting the compressor to work, and when the system comprises a plurality of compressors, starting the compressors according to the starting sequence of the compressor system. Preferably, the actual water temperature in the water tank can be further detected, and if the actual water temperature is satisfied to be less than the set temperature-C1, the compressor is started to work. If the actual water temperature does not meet the conditions, the current water level is high enough, the compressor is not started when the starting heating is not needed.
The method for self-adaptive control of the voltage of the heat pump system comprises the steps of dividing a plurality of working intervals of input voltage, controlling the compressor to be in an operation state or a shutdown state only according to a unique judgment interval, combining the water temperature condition in the water tank, setting a low-pressure working interval and a high-pressure working interval, namely meeting the condition of certain water temperature, enabling the compressor to still keep operating when the input voltage is higher than the safe working interval or lower than the safe working interval within a certain range, and enabling the current heat pump unit to be in safe operation by adjusting the startup number of the compressor when a plurality of compressors work.
In order to prevent the compressor from being damaged due to frequent starting, the method preferably further comprises the step of judging the starting time of the last compressor when the voltage meets the requirement of being located in a safe working interval, if the voltage meets the requirement that the starting time of the last compressor is more than or equal to 2min, the compressor is started to work, and otherwise, the compressor is not started.
In step S2, if the input voltage is less than the minimum value in the low-voltage operating interval, it indicates that the input voltage is too low, and the compressor cannot ensure the safe operation of the system in any state, so the compressor needs to be turned off to ensure the safety of the system.
In order to prevent the compressor from being damaged due to frequent starting, it is preferable that in step S2, if the input voltage is less than the minimum value in the low-pressure operating interval, the method further includes the step of determining the time from the last compressor shutdown, and if the time from the last compressor shutdown is not less than t1, the compressor is shut down and an adaptive low-pressure alarm prompt is sent, wherein t1 is less than 1 min. If the time for closing the compressor last time cannot meet the conditions, the compressor needs to be kept running until the compressor is closed after the conditions are met.
In step S2, if the input voltage is in the low-voltage operating region, that is, the current input voltage of the input voltage is lower than the safe operating region but not too low, and the current actual water temperature is less than the set temperature-C1, which indicates that the water level is low and the heating needs to be continued to meet the user demand, the current operating state of the compressor is maintained, and a self-adaptive low-voltage alarm prompt is sent, where C1 is greater than 0. The low pressure warning suggestion is used for the suggestion user, and the safe operation of heat pump system is further ensured to the mode that other consumer were closed to the accessible, because the low pressure operating interval is greater than the low pressure lower limit value of compressor operation, consequently, the compressor keeps the operation can not cause the damage under current voltage in the short time. If the current actual water temperature is not less than the set temperature-C1, the current water temperature is not reduced by a large margin, so that the system safety can be protected by controlling the compressor to stop.
When the system contains a plurality of compressors, the partial compressors can be controlled to be closed, the power consumption of the unit is reduced by reducing the starting number of the compressors, the voltage drop amplitude is reduced, the tripping phenomenon caused by overcurrent in low voltage is avoided, and the stability of the system is improved.
In step S2, if the input voltage is in the low-voltage operating region and the actual water temperature is less than the set temperature — C1, the method further includes the step of determining the time from the last time of starting the compressor, if the time from the last time of starting the compressor is not less than t2, the current operating state of the compressor is maintained, otherwise, the compressor is turned off, wherein t2 is more than 1min and less than 3 min.
After the heat pump system heats water to a set temperature, high-temperature water needs to exchange heat to achieve the function of the heat pump system, the water temperature gradually drops, when the water temperature drops to a certain water temperature value, the compressor needs to be started again to heat the water, when the water is heated to the set temperature, the compressor stops working and sequentially and circularly reciprocates, if the input voltage is in a high-voltage working interval, the current input voltage is higher, namely the power supply in a power grid is more abundant, and the set temperature + C2 is less than the actual water temperature and less than the set temperature + C2 +. DELTA.T, the running state of the current compressor is kept, and self-adaptive high-voltage alarm prompt is given out, wherein C2 is more than 0, and DELTA.T is more. If the actual water temperature is less than the set temperature + C2+ delta T, wherein C2+ delta T is the allowance left by the system for heating the water tank, although the set temperature is reached, the compressor can be continuously kept working due to abundant power supply, so that the water temperature in the water tank continuously rises, the water temperature is controlled to be higher than the set temperature within a certain range, because the water temperature is high, the heat exchange time of water can be prolonged, the starting time of the compressor can be prolonged for the next time, the starting times of the compressor are reduced, and the energy consumption can be saved.
If the input voltage is greater than the maximum value of the high-voltage working interval, and the set temperature + C2 is greater than the actual water temperature and is less than the set temperature + C2+ delta T, the current running state of the compressor is kept, and self-adaptive high-voltage alarm prompt is sent out, wherein C2 is greater than 0, and delta T is greater than 0. When the system comprises a plurality of compressors, whether all the compressors are started at present can be detected, if not, the compressors which are not started are controlled to be started in sequence, so that the electric load is increased, the voltage amplification is reduced, and the unit fault caused by overhigh voltage is avoided.
In order to prevent the compressor from being damaged due to frequent starting, if the input voltage is greater than the maximum value of a high-pressure working interval, the set temperature + C2 is greater than the actual water temperature and is less than the set temperature + C2+ delta T, the starting time of the compressor last time is judged, if the starting time of the compressor last time is greater than or equal to T3, the running state of the current compressor is kept, and self-adaptive high-pressure alarm prompt is carried out, wherein C2 is greater than 0, delta T is greater than 0, and T3 is greater than 1min and is less than 3 min.
If the water temperature reaches the upper limit, if the actual water temperature is larger than or equal to the set temperature + C2+ Delta T, the compressor is closed, and the compressor is closed at the moment, so that discomfort cannot be brought to user experience.
In a second embodiment, the present invention provides a heat pump system, which includes at least one compressor, where the compressor is a fixed-frequency compressor, and the heat pump system of the present embodiment performs adaptive control according to the heat pump system voltage adaptive control method described in the first embodiment. Specifically, reference may be made to the description of the first embodiment, which is not repeated herein, and it should be noted that the heat pump system of the present embodiment may be a heat pump air conditioning system, a heat pump heating stove, a heat pump water heater system, and the like, and the energy obtaining source may be an air energy heat pump, a solar heat pump, a geothermal energy heat pump, and the like, which all belong to the protection scope of the heat pump system.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A heat pump system voltage self-adaptive control method is characterized by comprising the following steps:
dividing the voltage into a plurality of working intervals according to the rated input voltage, wherein the working intervals at least comprise a safe working interval;
(1) detecting an input voltage, and comparing and judging the input voltage with a rated input voltage;
(2) and if the input voltage is in the safe working interval, heating the water in the water tank according to a preset control logic, otherwise, detecting the actual water temperature, comparing and judging the actual water temperature with the set temperature, and adjusting the running state of the compressor according to the judgment result.
2. The heat pump system voltage adaptive control method according to claim 1, wherein the voltage operating intervals further include a low-voltage operating interval and a high-voltage operating interval, wherein the value in the safe operating interval is greater than the value in the low-voltage operating interval and less than the value in the high-voltage operating interval, and in the step (2), if the input voltage is less than the minimum value in the low-voltage operating interval, the compressor is turned off.
3. The adaptive voltage control method for the heat pump system according to claim 2, wherein in the step (2), if the input voltage is smaller than the minimum value in the low-voltage working interval, the method further comprises the step of judging the time from the last compressor closing, if the time from the last compressor closing is not less than t1, the compressor is closed, and an adaptive low-voltage alarm prompt is sent, wherein the time is more than 1min and less than t1 and less than 3 min.
4. The adaptive voltage control method for the heat pump system according to any one of claims 1-3, wherein in the step (2), if the input voltage is in the low-pressure working interval and the actual water temperature is less than the set temperature-C1, the current operation state of the compressor is maintained or the number of the compressors is reduced, and an adaptive low-pressure alarm prompt is generated, wherein C1 is greater than 0.
5. The adaptive voltage control method for the heat pump system according to claim 4, wherein in the step (2), if the input voltage is in the low-pressure working interval and the actual water temperature is less than the set temperature-C1, the method further comprises the step of judging the time from the last time of starting the compressor, if the time from the last time of starting the compressor is more than or equal to t2, the current running state of the compressor is maintained or the starting number of the compressor is reduced, otherwise, the compressor is turned off, wherein 1min < t2 < 3 min.
6. The adaptive voltage control method for the heat pump system according to any one of claims 1-3, characterized in that if the input voltage is in a high-voltage working interval and the set temperature + C2 < actual water temperature < set temperature + C2 +. DELTA.T, the current operation state of the compressor is maintained and an adaptive high-voltage alarm prompt is generated, wherein C2 is greater than 0 and DELTA.T is greater than 0.
7. The heat pump system voltage adaptive control method according to any one of claims 1-3, characterized in that if the input voltage is greater than the maximum value of the high-voltage working interval, and the set temperature + C2 < actual water temperature < set temperature + C2 +. DELTA.T, the current operation state of the compressor is maintained or the number of the started compressors is increased, and an adaptive high-voltage alarm prompt is issued, wherein C2 > 0 and DELTA.T > 0.
8. The self-adaptive control method for the voltage of the heat pump system according to claim 7, wherein if the input voltage is greater than the maximum value of the high-voltage working interval, and the set temperature + C2 < the actual water temperature < the set temperature + C2 +. DELTA.T, the method further comprises the steps of judging the starting time of the compressor from the last time, and if the starting time of the compressor from the last time is greater than or equal to T3, keeping the current running state of the compressor or increasing the starting number of the compressors, and sending a self-adaptive high-voltage alarm prompt, wherein the time is less than 1min and less than T3 and less than 3 min.
9. The adaptive voltage control method for a heat pump system according to claim 7, wherein if the actual water temperature is greater than or equal to the set temperature + C2 +. DELTA.T, the compressor is turned off.
10. A heat pump system comprising at least one compressor, characterized in that it performs adaptive control according to the heat pump system voltage adaptive control method of any of claims 1-9.
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| KR20180027791A (en) * | 2016-09-07 | 2018-03-15 | 코웨이 주식회사 | Water heating device, bidet having the same and method for controlling water heating device |
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| CN101776318A (en) * | 2009-12-21 | 2010-07-14 | 宁波奥克斯空调有限公司 | Method for protecting compressor under high voltage and low voltage conditions |
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