CN111238009A - Frequency conversion control method of central air conditioner - Google Patents
Frequency conversion control method of central air conditioner Download PDFInfo
- Publication number
- CN111238009A CN111238009A CN201811446971.3A CN201811446971A CN111238009A CN 111238009 A CN111238009 A CN 111238009A CN 201811446971 A CN201811446971 A CN 201811446971A CN 111238009 A CN111238009 A CN 111238009A
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- Prior art keywords
- frequency
- control
- igbt module
- central air
- air conditioner
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a frequency conversion control method of a central air conditioner, which implements composite frequency control on cooling water and a refrigerating system according to the real-time temperature of an IGBT module and the temperature variation trend of the IGBT module, so that the refrigerating system achieves the optimal working efficiency, thereby avoiding the phenomena of energy saving on a pump and energy waste on a refrigerating machine.
Description
Technical Field
The invention relates to the technical field of central air conditioner control, in particular to a frequency conversion control method of a central air conditioner.
Background
With the increasing attention on the energy consumption of the central air conditioner, the frequency conversion control stably adjusts the cooling capacity of the central air conditioner, realizes the output of the refrigerating capacity under different loads, and becomes a mainstream control mode in the air conditioning industry. In the using process of the unit, the frequent protection of the frequency converter influences the stable operation of the unit.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a novel frequency conversion control method of a central air conditioner.
In order to achieve the aim, the invention provides a frequency conversion control method of a central air conditioner, wherein the central air conditioner comprises a frequency converter, the frequency converter comprises an IGBT module, and the method comprises the following steps of
Initializing a system, and monitoring set system parameters and the real-time temperature of the IGBT module in real time;
acquiring the temperature change trend of the IGBT module according to the real-time temperature of the IGBT module;
when the real-time temperature of the IGBT module does not reach the preset protection temperature, the controller controls the frequency of the central air conditioner according to the real-time temperature of the IGBT module and the temperature variation trend of the IGBT module: wherein the frequency control comprises
The system parameters comprise the water vapor pressure P1 of the refrigerant solution, the saturated vapor pressure P2 of the chilled water flowing out of the refrigerator, and the initial operating frequency f of the chilled water pump0Initial operating frequency f of cooling water pump0′；
Inputting the real-time temperature of the IGBT module and the temperature T1-T4 reflected by the temperature change trend of the IGBT module into a controller;
detecting the evaporation pressure P3 in the evaporator and inputting the pressure into the controller;
the controller carries out expert control composite algorithm on the input temperature change T1-T4 and the pressure P1-P3 to calculate the running frequency of the motors of the freezing water pump and the cooling water pump;
the controller judges whether the central air-conditioning system needs to additionally turn on or turn off a freezing water pump or a cooling water pump under the working condition, if so, corresponding on or off sub-program operation is executed;
if not, the controller outputs a control frequency conversion analog electric signal to the frequency converter to control the water pump motor to operate in a frequency conversion mode;
returning to the detection program, and continuously executing the detection setting parameters and the environment change parameters.
The frequency conversion control method of the central air conditioner comprises the following steps: the expert control composite algorithm adopts an integral separation PID control algorithm, and the integral separation PID control algorithm is as follows: setting a threshold value of epsilon > 0, only adopting PD differential algorithm control when | e (k) | > epsilon, and introducing PI integral algorithm control when | e (k) | < ∈.
The frequency conversion control method of the central air conditioner comprises the following steps: the controller judges whether the system needs to start or stop one pump, if the control frequency reaches the upper limit frequency of 50Hz, the pump is started after the timing of 15 minutes and still runs at the upper limit frequency of 50Hz, and if the pump is started completely, the alarm is given; and if the control frequency reaches the lower limit frequency of 35Hz and is still the lower limit frequency of 35Hz after the time is counted for 15 minutes, closing one pump.
The frequency conversion control method of the central air conditioner comprises the following steps: when the controller judges that the system frequency is between the upper limit frequency of 50Hz and the lower limit frequency of 35Hz, the controller outputs a frequency conversion analog electric signal to the frequency converter to control the operation of the water pump motor.
The invention has the following beneficial effects;
according to the variable frequency control method of the central air conditioner, the composite frequency control is carried out on the cooling water and the refrigerating system according to the real-time temperature of the IGBT module and the temperature change trend of the IGBT module, so that the refrigerating system achieves the optimal working efficiency, and the phenomena that energy is saved on a pump but energy is wasted on a refrigerating machine are avoided.
Detailed Description
The technical solution of the present invention is explained in detail below for easy understanding.
A frequency conversion control method of a central air conditioner comprises a frequency converter, wherein the frequency converter comprises an IGBT module, and the method comprises the following steps
Initializing a system, and monitoring set system parameters and the real-time temperature of the IGBT module in real time;
acquiring the temperature change trend of the IGBT module according to the real-time temperature of the IGBT module;
when the real-time temperature of the IGBT module does not reach the preset protection temperature, the controller controls the frequency of the central air conditioner according to the real-time temperature of the IGBT module and the temperature variation trend of the IGBT module: wherein the frequency control comprises
The system parameters comprise the water vapor pressure P1 of the refrigerant solution, the saturated vapor pressure P2 of the chilled water flowing out of the refrigerator, and the initial operating frequency f of the chilled water pump0Initial operating frequency f of cooling water pump0′；
Inputting the real-time temperature of the IGBT module and the temperature T1-T4 reflected by the temperature change trend of the IGBT module into a controller;
detecting the evaporation pressure P3 in the evaporator and inputting the pressure into the controller;
the controller carries out expert control composite algorithm on the input temperature change T1-T4 and the pressure P1-P3 to calculate the running frequency of the motors of the freezing water pump and the cooling water pump;
the controller judges whether the central air-conditioning system needs to additionally turn on or turn off a freezing water pump or a cooling water pump under the working condition, if so, corresponding on or off sub-program operation is executed;
if not, the controller outputs a control frequency conversion analog electric signal to the frequency converter to control the water pump motor to operate in a frequency conversion mode;
returning to the detection program, and continuously executing the detection setting parameters and the environment change parameters.
The frequency conversion control method of the central air conditioner comprises the following steps: the expert control composite algorithm adopts an integral separation PID control algorithm, and the integral separation PID control algorithm is as follows: setting a threshold value of epsilon > 0, only adopting PD differential algorithm control when | e (k) | > epsilon, and introducing PI integral algorithm control when | e (k) | < ∈.
The frequency conversion control method of the central air conditioner comprises the following steps: the controller judges whether the system needs to start or stop one pump, if the control frequency reaches the upper limit frequency of 50Hz, the pump is started after the timing of 15 minutes and still runs at the upper limit frequency of 50Hz, and if the pump is started completely, the alarm is given; and if the control frequency reaches the lower limit frequency of 35Hz and is still the lower limit frequency of 35Hz after the time is counted for 15 minutes, closing one pump.
The frequency conversion control method of the central air conditioner comprises the following steps: when the controller judges that the system frequency is between the upper limit frequency of 50Hz and the lower limit frequency of 35Hz, the controller outputs a frequency conversion analog electric signal to the frequency converter to control the operation of the water pump motor.
According to the variable frequency control method of the central air conditioner, the composite frequency control is carried out on the cooling water and the refrigerating system according to the real-time temperature of the IGBT module and the temperature change trend of the IGBT module, so that the refrigerating system achieves the optimal working efficiency, and the phenomena that energy is saved on a pump but energy is wasted on a refrigerating machine are avoided.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (4)
1. A frequency conversion control method of a central air conditioner, wherein the central air conditioner comprises a frequency converter, and is characterized in that: the frequency converter comprises an IGBT module, and the method comprises
Initializing a system, and monitoring set system parameters and the real-time temperature of the IGBT module in real time;
acquiring the temperature change trend of the IGBT module according to the real-time temperature of the IGBT module;
when the real-time temperature of the IGBT module does not reach the preset protection temperature, the controller controls the frequency of the central air conditioner according to the real-time temperature of the IGBT module and the temperature variation trend of the IGBT module: wherein the frequency control comprises
The system parameters comprise the water vapor pressure P1 of the refrigerant solution, the saturated vapor pressure P2 of the chilled water flowing out of the refrigerator, and the initial operating frequency f of the chilled water pump0Initial operating frequency f of cooling water pump0′；
Inputting the real-time temperature of the IGBT module and the temperature T1-T4 reflected by the temperature change trend of the IGBT module into a controller;
detecting the evaporation pressure P3 in the evaporator and inputting the pressure into the controller;
the controller carries out expert control composite algorithm on the input temperature change T1-T4 and the pressure P1-P3 to calculate the running frequency of the motors of the freezing water pump and the cooling water pump;
the controller judges whether the central air-conditioning system needs to additionally turn on or turn off a freezing water pump or a cooling water pump under the working condition, if so, corresponding on or off sub-program operation is executed;
if not, the controller outputs a control frequency conversion analog electric signal to the frequency converter to control the water pump motor to operate in a frequency conversion mode;
returning to the detection program, and continuously executing the detection setting parameters and the environment change parameters.
2. The inverter control method of central air-conditioner according to claim 1, wherein the expert control composite algorithm is an integral separation PID control algorithm, the integral separation PID control algorithm is: setting a threshold value of epsilon > 0, only adopting PD differential algorithm control when | e (k) | > epsilon, and introducing PI integral algorithm control when | e (k) | < ∈.
3. The inverter control method of a central air conditioner according to claim 2, wherein: the controller judges whether the system needs to start or stop one pump, if the control frequency reaches the upper limit frequency of 50Hz, the pump is started after the timing of 15 minutes and still runs at the upper limit frequency of 50Hz, and if the pump is started completely, the alarm is given; and if the control frequency reaches the lower limit frequency of 35Hz and is still the lower limit frequency of 35Hz after the time is counted for 15 minutes, closing one pump.
4. The inverter control method of a central air conditioner according to claim 2, wherein: when the controller judges that the system frequency is between the upper limit frequency of 50Hz and the lower limit frequency of 35Hz, the controller outputs a frequency conversion analog electric signal to the frequency converter to control the operation of the water pump motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811446971.3A CN111238009A (en) | 2018-11-29 | 2018-11-29 | Frequency conversion control method of central air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811446971.3A CN111238009A (en) | 2018-11-29 | 2018-11-29 | Frequency conversion control method of central air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN111238009A true CN111238009A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811446971.3A Pending CN111238009A (en) | 2018-11-29 | 2018-11-29 | Frequency conversion control method of central air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113602302A (en) * | 2021-07-21 | 2021-11-05 | 石家庄国祥运输设备有限公司 | Control method of split type railway vehicle air conditioning unit |
-
2018
- 2018-11-29 CN CN201811446971.3A patent/CN111238009A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113602302A (en) * | 2021-07-21 | 2021-11-05 | 石家庄国祥运输设备有限公司 | Control method of split type railway vehicle air conditioning unit |
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