CN111550956A - Loading and unloading control method and system for heat pump variable frequency compressor - Google Patents
Loading and unloading control method and system for heat pump variable frequency compressor Download PDFInfo
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- CN111550956A CN111550956A CN202010328383.0A CN202010328383A CN111550956A CN 111550956 A CN111550956 A CN 111550956A CN 202010328383 A CN202010328383 A CN 202010328383A CN 111550956 A CN111550956 A CN 111550956A
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- compressor
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- water temperature
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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
- 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
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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
- 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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- 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
- F25B2600/026—Compressor control by controlling unloaders
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- Thermal Sciences (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a loading and unloading control method and a system for a heat pump variable frequency compressor, wherein the method comprises the following steps: s1, acquiring the current backwater temperature Tn; s2, acquiring a target water temperature T, and calculating a water temperature deviation delta T which is Tn-T; s3, acquiring the backwater temperature Tb before 1 minute, and calculating the backwater temperature change rate delta T' ═ Tn-Tb; s4, reading a compressor frequency control TABLE TABLE, and searching an interval frequency value Fi positioned by delta T' and delta T in the TABLE; s5, acquiring a current frequency value Fn of the compressor, and calculating a target frequency F of the compressor, wherein F is Fn + Fi; further, TABLE is a two-dimensional TABLE, and a unique interval frequency value Fi can be located in TABLE by locating Δ T' and Δ T. According to the method for controlling the loading and unloading of the variable-frequency compressor of the heat pump, two dimensions of the return water temperature change rate and the water temperature deviation are introduced to control the loading and unloading of the compressor, and the frequent loading and unloading of the compressor can be reduced as much as possible on the premise that the unit can quickly meet the requirements of customers according to the limited loading, unloading and shutdown protection of the unit current.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a loading and unloading control method and system for a heat pump variable frequency compressor.
Background
Along with the propulsion of changing coal into electricity in the north, more and more people use the frequency conversion heating machine, to the frequency conversion heating machine, how to make the operation of unit satisfy customer's demand faster, compromise many-sided requirements such as energy-conservation, reliability simultaneously, under this kind of condition, need carry out energy-saving control to the compressor of heating unit. In the current industry, the frequency control of the compressor of the heating unit generally adopts 'table control' or loading and unloading are carried out through the difference value of target water temperature. The table control is to test the maximum frequency of the unit allowed to operate under different environmental temperatures and return water temperatures through a large number of tests, so as to manufacture a parameter table for control; in the other method, the compressor is operated at high frequency as much as possible to improve the heat production and shorten the heating time through the difference value between the actual water temperature and the target water temperature, namely when the temperature difference between the actual water temperature and the target water temperature is larger than a certain value; when the temperature difference between the two is smaller than a certain value, the frequency of the compressor is dynamically adjusted, and in order to ensure that the actual water temperature is within the target temperature range, the operating frequency of the compressor is lower at the moment. However, when the compressor frequency is higher than a certain frequency, the energy efficiency ratio of the heat pump water heater decreases as the compressor frequency increases, and when the frequency is lower than the certain frequency, the energy efficiency ratio of the heat pump water heater decreases as the compressor frequency decreases. Therefore, the reliability of the compressor cannot be ensured by the conventional mode of controlling the frequency of the compressor of the variable-frequency heat pump water heater through the actual water temperature.
To solve this problem, the present invention is hereby proposed.
Disclosure of Invention
The invention aims to provide a loading and unloading control method for a heat pump variable frequency compressor, which can reduce the frequent loading and unloading of the compressor as much as possible on the premise of quickly meeting the requirements of customers.
The purpose of the invention can be realized by the following technical scheme:
a loading and unloading control method for a heat pump inverter compressor comprises the following steps:
s1, acquiring the current backwater temperature Tn;
s2, acquiring a target water temperature T, and calculating a water temperature deviation delta T which is Tn-T;
s3, acquiring the backwater temperature Tb before 1 minute, and calculating the backwater temperature change rate delta T' ═ Tn-Tb;
s4, reading a compressor frequency control TABLE TABLE, and searching an interval frequency value Fi positioned by delta T' and delta T in the TABLE;
and S5, acquiring the current frequency value Fn of the compressor, and calculating the target frequency F of the compressor, wherein F is Fn + Fi.
Further, TABLE is a two-dimensional TABLE, and a unique interval frequency value Fi can be located in TABLE by locating Δ T' and Δ T.
Further, the current backwater temperature Tn is an average value of real-time backwater temperatures within 10s of forward estimation.
Preferably, the frequency change period is 60S, and the steps S1 to S5 are re-executed at an interval of 60S.
Further, the loading or unloading of the compressor is judged according to the positive value and the negative value of the interval frequency value Fi.
The invention also aims to provide a loading and unloading control system of the heat pump inverter compressor, which can realize the control method.
The purpose of the invention can be realized by the following technical scheme:
a loading and unloading control system of a heat pump variable frequency compressor comprises a controller, a unit heat exchanger, a storage unit and a compressor, wherein a water inlet of the unit heat exchanger is provided with a temperature sensor for detecting the water inlet temperature of the unit heat exchanger, and the temperature sensor is connected with the controller; the controller comprises a current backwater temperature obtaining module, a water temperature deviation calculating module, a backwater temperature change rate calculating module, an interval frequency value searching module and a target frequency calculating module;
the current backwater temperature acquisition module acquires the current backwater temperature through a temperature sensor;
the water temperature deviation calculation module acquires a target control return water temperature through user interaction or system setting, and calculates the difference between the current return water temperature and the target control return water temperature;
the return water temperature change rate calculation module is used for acquiring the return water temperature before 1 minute and calculating the difference value between the current return water temperature and the return water temperature before 1 minute;
the interval frequency value searching module reads the compressor frequency control table, searches in the compressor frequency control table and determines the interval frequency according to the return water temperature change rate and the water temperature deviation;
the target frequency calculation module is used for acquiring the current frequency value of the compressor and calculating the sum of the current frequency value of the compressor and the interval frequency value, wherein the sum is the target frequency of the compressor.
Further, the compressor frequency control table is stored in a storage unit, and the controller is connected to the storage unit and has access to the storage unit.
The invention has the beneficial effects that:
according to the method for controlling the loading and unloading of the variable-frequency compressor of the heat pump, two dimensions of the return water temperature change rate and the water temperature deviation are introduced to control the loading and unloading of the compressor, and then the loading, unloading and shutdown protection are carried out according to the current limit of the unit, so that the frequent loading and unloading of the compressor can be reduced as much as possible on the premise that the unit can quickly meet the requirements of customers.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a loading and unloading control method for a heat pump inverter compressor according to the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
Example 1
Referring to fig. 1, a method for controlling loading and unloading of a heat pump inverter compressor includes the following steps:
s1, acquiring the current backwater temperature Tn;
specifically, the return water temperature is the temperature of intaking of unit heat exchanger, and the water inlet department of unit heat exchanger is equipped with temperature sensor for detect the temperature of intaking of unit heat exchanger, at the in-process of heat pump work, the temperature sensor who sets up the water inlet department at the heat exchanger can detect the temperature of intaking of unit heat exchanger.
Preferably, the value of the temperature sensor is acquired every 0.1-1s, the value and the time are stored together, the heat pump is provided with a pulse timer, and the operation of acquiring the value of the temperature sensor every 0.1-1s can be realized through the pulse timer.
S2, acquiring a target control return water temperature T, and calculating a water temperature deviation delta T, wherein the delta T is Tn-T;
and acquiring a target control return water temperature through a control system of the heat pump, and calculating the water temperature deviation delta T through a formula delta T-Tn-T.
S3, acquiring the backwater temperature Tb before 1 minute, and calculating the backwater temperature change rate delta T ', wherein the delta T' is Tn-Tb;
if the starting time of the heat pump system is short and less than 1 minute, the control method of the invention is not started until the starting time of the heat pump system is more than or equal to 1 minute, and the control method is started.
S4, reading a compressor frequency control TABLE TABLE, and searching an interval frequency value Fi positioned by delta T' and delta T in the TABLE;
the compressor frequency control TABLE TABLE is a TABLE stored in two dimensions of a storage unit, and a unique interval frequency value Fi can be positioned in the TABLE by positioning delta T' and delta T;
in the two-dimensional space, only one point can be determined by two points, which is equivalent to determining X and Y points in the two-dimensional interval.
Referring to TABLE 1, a compressor frequency control TABLE is shown, the horizontal direction represents Δ T', the vertical direction represents Δ T, the number in the lower right square grid represents a load change value, the load change value is positive and needs to be loaded, and the load change value is negative and needs to be unloaded; by means of this table, it is possible to find a single determined interval frequency value Fi in the table, both Δ T' and Δ T being a set of time point values in intervals in order to avoid frequent loading and unloading of the compressor.
The interval frequency Fi is 4, which is found in table 1, taking Δ T' ═ 2 and Δ T ═ 1 as an example.
TABLE 1
And S5, calculating the target frequency F of the compressor as Fn + Fi.
Therefore, when Δ T' is-2 and Δ T is-1, the range frequency value Fi is 4 and the compressor target frequency F is Fn + 4.
The current return water temperature Tn is an average value of real-time return water temperatures within 10s of forward estimation.
Preferably, the frequency change period is 60S, i.e., the steps S1 to S5 are re-executed at an interval of 60S.
By adopting a heat pump variable frequency compressor loading and unloading control method, two dimensionalities of return water temperature change rate and water temperature deviation are introduced to control the loading and unloading of the compressor, and then the compressor is subjected to loading, unloading and shutdown protection according to the current limit of the unit, so that the frequent loading and unloading of the compressor can be reduced as much as possible on the premise that the unit can quickly meet the requirements of customers.
In order to protect the compressor, the compressor can be restarted when the time from the last loading and unloading of the compressor is confirmed to exceed the threshold, otherwise, the compressor is restarted after waiting for some time, namely the unit protection priority is superior to the loading and unloading adjustable priority.
Example 2
The utility model provides a heat pump variable frequency compressor adds uninstallation control system, includes controller, unit heat exchanger, memory cell and compressor, the water inlet department of unit heat exchanger is equipped with temperature sensor for detect the temperature of intaking of unit heat exchanger, temperature sensor is connected with the controller, at the in-process of heat pump work, the temperature sensor who sets up the water inlet department at the heat exchanger can detect the temperature of intaking of unit heat exchanger, the controller includes that current return water temperature obtains module, temperature deviation calculation module, return water temperature change rate calculation module, interval frequency value and seeks module and target frequency calculation module.
The current backwater temperature acquisition module acquires the current backwater temperature through a temperature sensor;
the water temperature deviation calculation module acquires a target control return water temperature through interaction with a user or system setting, and calculates the difference between the current return water temperature and the target control return water temperature;
the return water temperature change rate calculation module acquires the return water temperature before 1 minute and calculates the difference between the current return water temperature and the return water temperature before 1 minute;
the interval frequency value searching module reads a compressor frequency control table, searches in the compressor frequency control table, and determines the interval frequency according to the return water temperature change rate and the water temperature deviation; the compressor frequency control table is stored in a storage unit, and the controller is connected with the storage unit and can access the storage unit.
The target frequency calculation module obtains a current frequency value of the compressor and calculates a sum of the current frequency value of the compressor and the interval frequency value, wherein the sum is the target frequency of the compressor. And judging whether the compressor is loaded or unloaded according to the positive and negative values of the interval frequency.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A loading and unloading control method for a heat pump inverter compressor is characterized by comprising the following steps:
s1, acquiring the current backwater temperature Tn;
s2, acquiring a target water temperature T, and calculating a water temperature deviation delta T which is Tn-T;
s3, acquiring the backwater temperature Tb before 1 minute, and calculating the backwater temperature change rate delta T' ═ Tn-Tb;
s4, reading a compressor frequency control TABLE TABLE, and searching an interval frequency value Fi positioned by delta T' and delta T in the TABLE;
and S5, acquiring the current frequency value Fn of the compressor, and calculating the target frequency F of the compressor, wherein F is Fn + Fi.
2. The heat pump inverter compressor loading and unloading control method according to claim 1, wherein the TABLE is a TABLE with two dimensions, and a unique interval frequency value Fi can be located in the TABLE by locating Δ T' and Δ T.
3. The method for controlling loading and unloading of the frequency conversion compressor of the heat pump according to claim 2, wherein the current return water temperature Tn is an average value of real-time return water temperatures within 10s of forward estimation.
4. The heat pump inverter compressor loading and unloading control method according to claim 3, wherein the frequency variation period is 60 s.
5. The heat pump inverter compressor loading and unloading control method according to claim 4, wherein the steps S1 to S5 are re-executed at an interval of 60S.
6. The method for controlling the loading and unloading of the heat pump inverter compressor according to claim 1, wherein the loading or unloading of the compressor is determined according to the positive and negative values of the interval frequency value Fi.
7. A loading and unloading control system of a heat pump variable frequency compressor comprises a controller, a unit heat exchanger, a storage unit and a compressor, and is characterized in that a temperature sensor is arranged at a water inlet of the unit heat exchanger and used for detecting the water inlet temperature of the unit heat exchanger, and the temperature sensor is connected with the controller; the controller comprises a current backwater temperature obtaining module, a water temperature deviation calculating module, a backwater temperature change rate calculating module, an interval frequency value searching module and a target frequency calculating module;
the current backwater temperature acquisition module acquires the current backwater temperature through a temperature sensor;
the water temperature deviation calculation module acquires a target control return water temperature through user interaction or system setting, and calculates the difference between the current return water temperature and the target control return water temperature;
the return water temperature change rate calculation module is used for acquiring the return water temperature before 1 minute and calculating the difference value between the current return water temperature and the return water temperature before 1 minute;
the interval frequency value searching module reads the compressor frequency control table, searches in the compressor frequency control table and determines the interval frequency according to the return water temperature change rate and the water temperature deviation;
the target frequency calculation module is used for acquiring the current frequency value of the compressor and calculating the sum of the current frequency value of the compressor and the interval frequency value, wherein the sum is the target frequency of the compressor.
8. The heat pump inverter press loading and unloading control system of claim 7, wherein the compressor frequency control table is stored in a memory unit, and the controller is connected to the memory unit and has access to the memory unit.
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| CN202010328383.0A CN111550956A (en) | 2020-04-23 | 2020-04-23 | Loading and unloading control method and system for heat pump variable frequency compressor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137772A (en) * | 2021-04-26 | 2021-07-20 | 佳木斯大学 | Piston type water chilling unit PLC control system and method based on fuzzy algorithm |
| CN113310257A (en) * | 2021-06-02 | 2021-08-27 | 广东纽恩泰新能源科技发展有限公司 | Control method for outlet water temperature of heat pump |
| CN113639493A (en) * | 2021-08-13 | 2021-11-12 | 广东纽恩泰新能源科技发展有限公司 | Module control method of low-temperature air source heat pump system |
| CN114234447A (en) * | 2021-12-23 | 2022-03-25 | 广东纽恩泰新能源科技发展有限公司 | Low-temperature variable-frequency heat pump compressor frequency control method and device |
| CN114484935A (en) * | 2021-12-31 | 2022-05-13 | 青岛海尔空调电子有限公司 | Heat pump unit and control method and control device thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113137772A (en) * | 2021-04-26 | 2021-07-20 | 佳木斯大学 | Piston type water chilling unit PLC control system and method based on fuzzy algorithm |
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| CN114484935B (en) * | 2021-12-31 | 2023-09-26 | 青岛海尔空调电子有限公司 | Heat pump unit and control method and control device thereof |
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Application publication date: 20200818 |