CN112833524A - Controller and method for automatically adjusting tail end of variable air volume air conditioner of public building - Google Patents

Controller and method for automatically adjusting tail end of variable air volume air conditioner of public building Download PDF

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Publication number
CN112833524A
CN112833524A CN202011640223.6A CN202011640223A CN112833524A CN 112833524 A CN112833524 A CN 112833524A CN 202011640223 A CN202011640223 A CN 202011640223A CN 112833524 A CN112833524 A CN 112833524A
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air
room temperature
controller
room
communication interface
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历秀明
韩宗伟
纪强
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Northeastern University China
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Northeastern University China
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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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F24F11/58—Remote control using Internet communication
    • 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

Abstract

The invention provides an autonomous adjusting controller and method for a variable air volume air conditioner tail end of a public building, and relates to the technical field of energy-saving control of air conditioning systems. The controller comprises a power supply module, a CPU, an analog signal input/output module, an RS485 communication interface module, an Ethernet communication interface module and an LCD touch screen; the analog signal input and output module, the RS485 communication interface module, the Ethernet communication interface module and the LCD touch screen are respectively connected to the CPU, and the adjustment parameters of the PI controller at the tail end of the VAV air conditioner are calculated on line according to the real-time collected air supply quantity, air supply temperature, room temperature setting and the measured value thereof, and the valve position feedback of the air valve actuator according to the relation between the room temperature regulation dynamic model and the PI controller parameters. The invention adopts an unmanned intervention and autonomous adjustment mode, improves the application effect of the air conditioning system, obviously reduces the hardware cost, and ensures the room temperature control precision and the control stability by automatically setting the controller parameters in real time on line, thereby realizing the energy saving of the system to the maximum extent.

Description

Controller and method for automatically adjusting tail end of variable air volume air conditioner of public building
Technical Field
The invention relates to the technical field of energy-saving control of air conditioning systems, in particular to an autonomous adjusting controller and method for a variable air volume air conditioner tail end of a public building.
Background
Variable Air Volume (VAV) air conditioning systems are widely used in office buildings, shopping malls, hotels, etc. as a typical all-air conditioning system. However, most of domestic VAV air conditioning systems put into use have the problems of unstable operation, poor thermal comfort and high operation energy consumption, and even are operated in a constant air volume mode, so that the variable air volume air conditioning system with the same virtual system shape and higher manufacturing cost does not have the advantages of high comfort and energy saving.
Public building adaptation (committing) is taken as an important means for realizing building energy conservation at low cost and ensuring the physical environment of high-quality buildings, has been fully paid attention in developed countries such as Europe and America, and is started late in China, so that the public building adaptation (committing) is gradually accepted by the industry in recent years. The air conditioner terminal of the large-scale public building and the regulating and controlling equipment thereof are used as key parts for building a healthy and comfortable indoor thermal environment, and the regulating performance of the air conditioner terminal directly influences the overall operation effect of the system. Many researches show that the room temperature adjusting process at the tail end of the variable air volume air conditioner of the public building has strong nonlinear characteristics, and an accurate physical model is difficult to establish and is used as a basis for implementing online control.
The terminal room temperature control of the variable air volume air conditioner is generally realized based on two terminals of a pressure-dependent type and a pressure-independent type. For the pressure-related terminal, a PI control algorithm is often adopted for terminal room temperature control, and the opening degree of a terminal air valve is directly controlled according to the deviation between a room measured value and a set value. For the tail end of the variable air volume with independent pressure, a cascade PI control algorithm is usually adopted for controlling the tail end room temperature, the tail end room temperature is used as a main control quantity, and the tail end air supply quantity is used as an auxiliary control quantity. The outer ring control loop calculates and determines a set value of the tail end air volume according to the deviation between the set value of the room temperature and the measured value and the proportional integral; and the inner ring control loop calculates and determines the opening degree of the tail end air valve according to the deviation between the tail end air volume set value and the measured value and the proportional integral.
From the control angle, in the dynamic room temperature adjusting process of the air conditioner tail end, the adjusting parameters of room temperature controllers in different rooms are different; even in the same room, the controller adjusting parameters of different indoor and outdoor conditions are different, namely, the room temperature controller parameters are self-adjusted on line along with the change of the operating conditions. However, the air conditioner room temperature adjusting process is a very complicated non-linear control process, and it is difficult to establish an accurate mathematical model thereof and realize on-line control based on the accurate mathematical model. Therefore, in practical applications, people can only complete control strategy formulation and parameter setting work by experience, which often causes the phenomena of deviation of room temperature from a set value, frequent actions of an actuator and the like during system operation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an autonomous adjusting controller and method for the tail end of the variable air volume air conditioner of the public building aiming at the defects of the prior art, so that the unmanned intervention and autonomous adjustment of the tail end room temperature of the variable air volume air conditioner system can be more effectively realized, and the plug and play can be realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
on one hand, the invention provides an autonomous adjusting controller for a variable air volume air conditioner tail end of a public building, which comprises a power module, a CPU, an analog signal input and output module, an RS485 communication interface module, an Ethernet communication interface module and an LCD touch screen; the analog signal input/output module, the RS485 communication interface module, the Ethernet communication interface module and the LCD touch screen are respectively connected to the CPU, and the power supply module supplies power to other modules;
the RS485 communication interface module supports Modbus RTU and PPI serial port protocols, is used for connecting an air-conditioning room temperature controller or an indoor temperature sensor with an RS485 interface, and acquires room temperature set values and measured values;
the analog signal input and output module is connected with an air valve actuator at the variable air volume end, an air pressure sensor for monitoring the air volume and an air supply temperature sensor;
the Ethernet communication interface module is connected with an autonomous adjustment controller or an air conditioning unit controller at the tail end of a similar variable air volume air conditioner in an adjacent room, and valve position information of an air valve at the corresponding tail end is shared;
the LCD touch screen is used for manually setting delivery and pre-debugging parameters, and manually inputting the room volume at the tail end of the VAV air conditioner and configuring the communication parameter information with third-party equipment;
the CPU calculates the adjusting parameters of the room temperature PI controller at the tail end of the VAV air conditioner on line according to the relation between the room temperature regulation dynamic model and the PI controller parameters according to the air supply quantity, the air supply temperature, the room temperature setting and the measured value thereof and the valve position feedback of the air valve actuator which are collected in real time, and the specific method is as follows:
according to the mass and energy conservation equation, the physical relationship between the dynamic change of the room temperature and the system regulating variable in regulation and control is obtained as follows:
Figure BDA0002879838110000021
where ρ isrRepresents the air density; cPRepresents the specific heat capacity at constant pressure; vrRepresenting a room volume; t isrRepresents room temperature; rhosupAnd ρoutRespectively representing the density of the supplied air and the density of the discharged air; gsupAnd GoutRespectively representing the air supply amount and the air exhaust amount; t issupIndicating the temperature of the supplied air; qLRepresenting the instantaneous sensible heat load of the room;
converting the formula (1) into the following components under the condition of variable air volume regulation:
Figure BDA0002879838110000022
wherein, beta represents the ratio of the air volume in the room to be exhausted to the air volume in the room;
considering that the room temperature changes caused by changing the air supply volume of the air-conditioning room in the dynamic adjustment of the room temperature; assuming that the room temperature fluctuates within a set range thereof before the current time, the room temperature variation at the current time is regarded as the deviation of the room temperature measurement value from the set value thereof;
ΔTr＝Tr(t)-Tsp (3)
ΔQL＝ΔQL(t)-QL(tsp) (4)
ΔGsup＝Gsup(t)-Gsup(tsp) (5)
wherein, tspIndicating the time when the room temperature satisfies a set value; t isspRepresenting a room temperature set value of the air-conditioning room; qLRepresenting the instantaneous sensible heat load of the room;
when the room temperature fluctuates around its set value, the amount of cooling supplied to the room from the end of the variable air volume is considered to be equal to the instantaneous load at that time, and then equation (1) is expressed as:
Figure BDA0002879838110000031
substituting formula (6) for formula (1) to obtain:
Figure BDA0002879838110000032
Δ G within a single control period when the room temperature fluctuates within its set rangesupΔTrIf the change is small and is ignored, the formula (7) is arranged into a state space equation expression form:
Figure BDA0002879838110000033
wherein the content of the first and second substances,
Figure BDA0002879838110000034
the conversion to the corresponding transfer function is:
Figure BDA0002879838110000035
for the transfer function shown as the formula (11), the corresponding PI controller parameter setting formula is shown as the formula (12);
Figure BDA0002879838110000041
Figure BDA0002879838110000042
wherein K represents a proportionality coefficient; τ represents the pure lag time coefficient; t represents an inertia time constant; kpExpressing a proportional coefficient in a setting formula; kiRepresents an integral coefficient;
and calculating the parameter setting result of the PI controller according to the corresponding relation between the expression (10) and the expression (11) and the expression (12).
Furthermore, the analog signal input and output module comprises 1 channel of PT100 signal for connecting an air supply temperature sensor, 1 channel of 4-20 mA signal for connecting an air pressure sensor for monitoring air volume, 1 channel of 0-10V analog signal input signal for connecting valve position feedback of an end air valve actuator with variable air volume and 1 channel of 0-10V analog signal output signal for connecting valve position setting of the end air valve actuator with variable air volume.
Furthermore, the RS485 communication interface module has the capability of configuring the parameter information of the terminal automatic adjustment controller of the variable air volume air conditioner through the RS485 interface.
Further, the ethernet communication interface module comprises 2 RJ45 wired ethernet communication interfaces and 1 Wi-Fi wireless communication interface, and both interfaces are used for connecting the same type variable air volume air conditioner terminal autonomous adjustment controller or air conditioning unit controller of the adjacent room.
On the other hand, the invention also provides an autonomous adaptation control method for the tail end of the variable air volume air conditioner of the public building, which is realized by adopting the autonomous adaptation controller for the tail end of the variable air volume air conditioner of the public building and comprises the following steps:
the method comprises the following steps: the method comprises the steps that an automatic adjustment controller at the tail end of the variable air volume air conditioner is initialized, and the automatic adjustment controller comprises an initialization analog signal input and output module, an RS485 communication interface module, an Ethernet communication interface module and an LCD touch screen, wherein an RS485 interface is required to be initialized in the RS485 communication interface module to collect room temperature controller information, and the room temperature controller information comprises a room temperature set value and a measured value;
step two: manually inputting the room volume through a touch screen, and configuring related communication parameters when the room volume is matched with a third-party temperature controller for use, wherein the related communication parameters comprise communication addresses, room temperature set values and measured value register addresses;
step three: according to unit step response test, manually acquiring the lag time of room temperature to the air supply quantity and the air supply temperature, and inputting the result into a memory of a CPU (central processing unit) through an LCD (liquid crystal display) touch screen or an RS485 communication interface module;
or automatically acquiring the lag time of room temperature to the air supply quantity and the air supply temperature according to the hysteresis relay feedback control, and automatically storing the result into a memory of the CPU;
step four: initializing PI algorithm parameters, wherein the PI algorithm parameters are factory default values based on artificial experience, the proportionality coefficient is 7, and the integral coefficient is 35;
step five: and acquiring the air supply quantity, the air supply temperature, the room temperature setting and the measured value thereof and the valve position feedback information of the air valve actuator in real time, and calculating the adjusting parameter of the terminal room temperature PI controller of the VAV air conditioner on line according to the relation between the room temperature regulation dynamic model and the PI controller parameter.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the controller and the method for automatically adjusting the tail end of the variable air volume air conditioner of the public building adopt a mode of no human intervention and automatic adjustment, improve the application effect of an air conditioning system, and have hardware cost obviously lower than that of a DDC (direct digital control) and PLC (programmable logic controller) control mode which is commonly used in engineering. The control precision and the control stability of the room temperature are ensured by automatically setting the parameters of the controller in real time on line, thereby realizing the energy conservation of the system to the maximum extent.
Drawings
Fig. 1 is a schematic diagram illustrating an autonomous adaptive control of a variable air volume air conditioner terminal according to an embodiment of the present invention;
fig. 2 is a block diagram of a structure of an autonomous adaptive controller at a variable air volume air conditioner terminal of a public building according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a power module of an autonomous adaptive controller at a variable air volume air conditioner terminal of a public building according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a CPU circuit of an autonomous adaptive controller at a variable air volume air conditioner terminal of a public building according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an analog signal input/output module of an autonomous adaptive controller at a variable air volume air conditioner terminal of a public building according to an embodiment of the present invention; wherein, (a) is a schematic diagram of an analog signal input circuit, and (b) is a schematic diagram of an analog signal output circuit;
fig. 6 is a schematic circuit diagram of an RS585 communication interface module of an autonomous adaptive controller at a variable air volume air conditioner terminal of a public building according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of an ethernet communication interface module of an autonomous adaptive controller at a variable air volume air conditioner end of a public building according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the public building variable air volume air conditioner terminal autonomous adaptive controller and method of the present embodiment are designed according to the principle.
The controller for automatically adjusting the tail end of the variable air volume air conditioner of the public building, provided by the embodiment, as shown in fig. 2, comprises a power module, a CPU, an analog signal input and output module, an RS485 communication interface module, an ethernet communication interface module, and an LCD touch screen. The power supply module, the CPU, the analog signal input/output module, the RS485 communication interface module and the Ethernet communication interface module are respectively shown in the schematic circuit diagrams of FIGS. 3-7. The analog signal input and output module, the RS485 communication interface module, the Ethernet communication interface module and the LCD touch screen are respectively connected to the CPU.
And the power supply module is used for supplying power to other modules.
The RS485 communication interface module supports Modbus RTU and PPI serial port protocols, is used for being connected with an air-conditioning room temperature controller or an indoor temperature sensor with an RS485 interface, collects room temperature set values and measured values, and further has the capability of automatically adjusting parameter information of the controller through RS485 interface configuration.
The analog signal input and output module is connected with the variable air volume end air valve actuator, the air pressure sensor for monitoring the air volume and the air supply temperature sensor, and specifically comprises 1 channel of PT100 signal for connecting the air supply temperature sensor, 1 channel of 4-20 mA signal for connecting the air pressure sensor for monitoring the air volume, 1 channel of 0-10V analog signal input signal fed back by connecting the valve position of the variable air volume end air valve actuator and 1 channel of 0-10V analog signal output signal set by connecting the valve position of the variable air volume end air valve actuator.
The Ethernet communication interface module comprises 2 RJ45 wired Ethernet communication interfaces and 1 Wi-Fi wireless communication interface, and is used for being connected with a similar variable air volume air conditioner terminal autonomous adjustment controller or an air conditioning unit controller of an adjacent room to share valve position information of a corresponding terminal air valve.
The LCD touch screen is used for manually setting delivery and pre-debugging parameters and manually inputting the room volume at the tail end of the VAV air conditioner and configuring the communication parameter information of third-party equipment.
And the CPU calculates the adjusting parameters of the room temperature PI controller at the tail end of the VAV air conditioner on line according to the relation between the room temperature regulation dynamic model and the parameters of the PI controller according to the real-time collected air supply quantity, air supply temperature, room temperature setting and the measured value thereof and the valve position feedback of the air valve actuator.
According to the mass and energy conservation equation, the physical relationship between the dynamic change of the room temperature and the system regulating variable in regulation and control is obtained as follows:
Figure BDA0002879838110000061
where ρ isrRepresents the air density; cPRepresents the specific heat capacity at constant pressure; vrRepresenting a room volume; t isrRepresents room temperature; rhosupAnd ρoutRespectively representing the density of the supplied air and the density of the discharged air; gsupAnd GoutRespectively representing the air supply amount and the air exhaust amount; t issupIndicating the temperature of the supplied air; qLRepresenting the room sensible heat load;
converting the formula (1) into the following components under the condition of variable air volume regulation:
Figure BDA0002879838110000062
wherein, beta represents the ratio of the air volume in the room to be exhausted to the air volume in the room;
in consideration of dynamic adjustment of the room temperature, the room temperature is changed by changing the air supply amount of the air-conditioned room. Assuming that the room temperature fluctuates within a set range thereof before the current time, the room temperature variation at the current time is regarded as the deviation of the room temperature measurement value from the set value thereof;
ΔTr＝Tr(t)-Tsp (3)
ΔQL＝ΔQL(t)-QL(tsp) (4)
ΔGsup＝Gsup(t)-Gsup(tsp) (5)
wherein, tspIndicating the time when the room temperature satisfies a set value; t isspRepresenting a room temperature set value of the air-conditioning room; qLRepresenting the instantaneous load of the room.
It is to be noted that, when the room temperature fluctuates around its set value, the cooling capacity of the variable air volume end to the room is considered to be equal to the instantaneous load at that time, and then equation (1) is expressed as:
Figure BDA0002879838110000071
substituting formula (6) for formula (1) to obtain:
Figure BDA0002879838110000072
Δ G within a single control period when the room temperature fluctuates within its set rangesupΔTrWith little, negligible variation, equation (7) is put into the following form:
Figure BDA0002879838110000073
wherein the content of the first and second substances,
Figure BDA0002879838110000074
the conversion to the corresponding transfer function is:
Figure BDA0002879838110000075
for the transfer function shown in the formula (11), the corresponding PI controller parameter setting formula is shown in the formula (12).
Figure BDA0002879838110000081
Figure BDA0002879838110000082
Wherein K represents a proportionality coefficient; τ represents the pure lag time coefficient; t represents an inertia time constant; kpExpressing a proportional coefficient in a setting formula; kiRepresenting the integral coefficient.
And calculating the parameter setting result of the PI controller according to the corresponding relation between the expression (10) and the expression (11) and the expression (12).
The method for controlling the independent terminal adjustment of the variable air volume air conditioner of the public building, which is provided by the embodiment, is realized by adopting the independent terminal adjustment controller of the variable air volume air conditioner of the public building, and comprises the following steps:
the method comprises the following steps: the method comprises the steps that an automatic adjustment controller at the tail end of the variable air volume air conditioner is initialized, and the automatic adjustment controller comprises an initialization analog signal input and output module, an RS485 communication interface module, an Ethernet communication interface module and an LCD touch screen, wherein an RS485 interface is required to be initialized in the RS485 communication interface module to collect room temperature controller information, and the room temperature controller information comprises a room temperature set value and a measured value;
step two: manually inputting the room volume through a touch screen, and configuring related communication parameters when the room volume is matched with a third-party temperature controller for use, wherein the related communication parameters comprise communication addresses, room temperature set values and measured value register addresses;
step three: according to unit step response test, manually acquiring the lag time of room temperature to the air supply quantity and the air supply temperature, and inputting the result into a memory of a CPU (central processing unit) through an LCD (liquid crystal display) touch screen or an RS485 communication interface module;
or automatically acquiring the lag time of room temperature to the air supply quantity and the air supply temperature according to the hysteresis relay feedback control, and automatically storing the result into a memory of the CPU;
step four: initializing PI algorithm parameters, wherein the PI algorithm parameters are factory default values based on artificial experience, the proportionality coefficient is 7, and the integral coefficient is 35;
step five: and acquiring the air supply quantity, the air supply temperature, the room temperature setting and the measured value thereof and the valve position feedback information of the air valve actuator in real time, and calculating the adjusting parameter of the terminal room temperature PI controller of the VAV air conditioner on line according to the relation between the room temperature regulation dynamic model and the PI controller parameter.
Taking a variable air volume air conditioning system project of a certain large public building as an example, the application process of the terminal autonomous adaptive controller of the variable air volume air conditioner is as follows:
step 1: the method comprises the following steps that an automatic adjusting controller at the tail end of the variable air volume air conditioner is installed on variable air volume tail end equipment and is in physical connection with an air valve actuator, a temperature sensor and a custom sensor which are accessories of the equipment, and the parameter configuration of a physical channel is completed;
step 2: the automatic adjustment controller is connected with an adjacent room automatic adjustment controller by a hand pull through an RJ45 interface, and the automatic adjustment controller is connected with a temperature controller corresponding to a control area through an RS485 interface to complete parameter communication parameter configuration;
and step 3: inputting the room volume through a human-computer interaction LCD touch screen debugging device, and inputting a pure lag time coefficient of the room temperature to the system adjustment quantity in a manual or automatic mode;
and 4, step 4: and electrifying, and checking the operation effect including the operation state of the sensor actuator, whether the network communication connection is normal, the room temperature control effect and the like through a human-computer interaction interface.
The existing method has the following outstanding problems when building and adjusting are moderate: firstly, engineering technicians usually adopt an experience trial and error method to adjust a single room temperature control device, and the result is different from person to person depending on subjective judgment; secondly, the air conditioner room temperature of the public building has a plurality of devices, each device needs to be adjusted independently, the workload is large, the repeatability is high, the implementation efficiency is too low, and the construction cost is increased. The method provided by the embodiment can automatically complete parameter setting work of the room temperature controller at the tail end of the air conditioner on the premise of no participation of people, improves system adjustment efficiency, reduces construction cost and improves building intelligence level.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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 or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.

Claims (5)

1. The utility model provides a controller is independently adjusted to public building variable air volume air conditioner end which characterized in that: the device comprises a power supply module, a CPU, an analog signal input/output module, an RS485 communication interface module, an Ethernet communication interface module and an LCD touch screen; the analog signal input/output module, the RS485 communication interface module, the Ethernet communication interface module and the LCD touch screen are respectively connected to the CPU, and the power supply module supplies power to other modules;
the RS485 communication interface module supports Modbus RTU and PPI serial port protocols, is used for connecting an air-conditioning room temperature controller or an indoor temperature sensor with an RS485 interface, and acquires room temperature set values and measured values;
the analog signal input and output module is connected with an air valve actuator at the variable air volume end, an air pressure sensor for monitoring the air volume and an air supply temperature sensor;
the Ethernet communication interface module is connected with an autonomous adjustment controller or an air conditioning unit controller at the tail end of a similar variable air volume air conditioner in an adjacent room, and valve position information of an air valve at the corresponding tail end is shared;
the LCD touch screen is used for manually setting delivery and pre-debugging parameters, and manually inputting the room volume at the tail end of the VAV air conditioner and configuring the communication parameter information with third-party equipment;
the CPU calculates the adjusting parameters of the room temperature PI controller at the tail end of the VAV air conditioner on line according to the relation between the room temperature regulation dynamic model and the PI controller parameters according to the air supply quantity, the air supply temperature, the room temperature setting and the measured value thereof and the valve position feedback of the air valve actuator which are collected in real time, and the specific method is as follows:
according to the mass and energy conservation equation, the physical relationship between the dynamic change of the room temperature and the system regulating variable in regulation and control is obtained as follows:
Figure FDA0002879838100000011
where ρ isrRepresents the air density; cpRepresents the specific heat capacity at constant pressure; vrRepresenting a room volume; t isrRepresents room temperature; rhosupAnd ρoutRespectively representing the density of the supplied air and the density of the discharged air; gsupAnd GoutRespectively representing the air supply amount and the air exhaust amount; t issupIndicating the temperature of the supplied air; qLRepresenting the instantaneous sensible heat load of the room;
converting the formula (1) into the following components under the condition of variable air volume regulation:
Figure FDA0002879838100000012
wherein, beta represents the ratio of the air volume in the room to be exhausted to the air volume in the room;
considering that the room temperature changes caused by changing the air supply volume of the air-conditioning room in the dynamic adjustment of the room temperature; assuming that the room temperature fluctuates within a set range thereof before the current time, the room temperature variation at the current time is regarded as the deviation of the room temperature measurement value from the set value thereof;
ΔTr＝Tr(t)-Tsp (3)
ΔQL＝ΔQL(t)-QL(tsp) (4)
ΔGsup＝Gsup(t)-Gsup(tsp) (5)
wherein, tspIndicating the time when the room temperature satisfies a set value; t isspRepresenting a room temperature set value of the air-conditioning room; qLRepresenting the instantaneous sensible heat load of the room;
when the room temperature fluctuates around its set value, the amount of cooling supplied to the room from the end of the variable air volume is considered to be equal to the instantaneous load at that time, and then equation (1) is expressed as:
Figure FDA0002879838100000021
substituting formula (6) for formula (1) to obtain:
Figure FDA0002879838100000022
Δ G within a single control period when the room temperature fluctuates within its set rangesupΔTrIf the change is small and is ignored, the formula (7) is arranged into a state space equation expression form:
Figure FDA0002879838100000023
wherein the content of the first and second substances,
Figure FDA0002879838100000024
the conversion to the corresponding transfer function is:
Figure FDA0002879838100000025
for the transfer function shown as the formula (11), the corresponding PI controller parameter setting formula is shown as the formula (12);
Figure FDA0002879838100000026
Figure FDA0002879838100000031
wherein K represents a proportionality coefficient; τ represents the pure lag time coefficient; t represents an inertia time constant; kpExpressing a proportional coefficient in a setting formula; kiRepresents an integral coefficient;
and calculating the parameter setting result of the PI controller according to the corresponding relation between the expression (10) and the expression (11) and the expression (12).
2. The terminal autonomous adaptation controller of variable air volume air conditioners for public buildings according to claim 1, characterized in that: the analog signal input and output module comprises 1 path of PT100 signals used for connecting an air supply temperature sensor, 1 path of 4-20 mA signals used for connecting an air pressure sensor for monitoring air quantity, 1 path of 0-10V analog signal input signals used for connecting valve position feedback of an end air valve actuator of variable air quantity and 1 path of 0-10V analog signal output signals used for connecting valve position setting of the end air valve actuator of variable air quantity.
3. The terminal autonomous adaptation controller of variable air volume air conditioners for public buildings according to claim 1, characterized in that: the RS485 communication interface module has the capability of configuring the parameter information of the terminal autonomous adaptive controller of the variable air volume air conditioner through the RS485 interface.
4. The terminal autonomous adaptation controller of variable air volume air conditioners for public buildings according to claim 1, characterized in that: the Ethernet communication interface module comprises 2 RJ45 wired Ethernet communication interfaces and 1 Wi-Fi wireless communication interface, and the two interfaces are used for connecting an autonomous adaptive controller or an air conditioning unit controller of the same type variable air volume air conditioning terminal of an adjacent room.
5. A public building variable air volume air conditioner terminal autonomous adjustment control method is characterized in that: the method is realized by adopting the public building variable air volume air conditioner terminal autonomous adaptation controller of claim 1, and comprises the following steps:
the method comprises the following steps: the method comprises the steps that an automatic adjustment controller at the tail end of the variable air volume air conditioner is initialized, and the automatic adjustment controller comprises an initialization analog signal input and output module, an RS485 communication interface module, an Ethernet communication interface module and an LCD touch screen, wherein an RS485 interface is required to be initialized in the RS485 communication interface module to collect room temperature controller information, and the room temperature controller information comprises a room temperature set value and a measured value;
step two: manually inputting the room volume through a touch screen, and configuring related communication parameters when the room volume is matched with a third-party temperature controller for use, wherein the related communication parameters comprise communication addresses, room temperature set values and measured value register addresses;
step three: according to unit step response test, manually acquiring the lag time of room temperature to the air supply quantity and the air supply temperature, and inputting the result into a memory of a CPU (central processing unit) through an LCD (liquid crystal display) touch screen or an RS485 communication interface module;
or automatically acquiring the lag time of room temperature to the air supply quantity and the air supply temperature according to the hysteresis relay feedback control, and automatically storing the result into a memory of the CPU;
step four: initializing PI algorithm parameters, wherein the PI algorithm parameters are factory default values based on artificial experience, the proportionality coefficient is 7, and the integral coefficient is 35;
step five: the method comprises the steps of collecting air supply quantity, air supply temperature, room temperature setting and measured values thereof and valve position feedback information of an air valve actuator in real time, and calculating adjusting parameters of a VAV air conditioner terminal room temperature PI controller on line according to the relation between a room temperature regulation dynamic model and PI controller parameters, and comprises the following specific steps:
according to the mass and energy conservation equation, the physical relationship between the dynamic change of the room temperature and the system regulating variable in regulation and control is obtained as follows:
Figure FDA0002879838100000041
where ρ isrRepresents the air density; cpRepresents the specific heat capacity at constant pressure; vrRepresenting a room volume; t isrRepresents room temperature; rhosupAnd ρoutRespectively representing the density of the supplied air and the density of the discharged air; gsupAnd GoutRespectively representing the air supply amount and the air exhaust amount; t issupIndicating the temperature of the supplied air; qLRepresenting the instantaneous sensible heat load of the room;
converting the formula (1) into the following components under the condition of variable air volume regulation:
Figure FDA0002879838100000042
wherein, beta represents the ratio of the air volume in the room to be exhausted to the air volume in the room;
considering that the room temperature changes caused by changing the air supply volume of the air-conditioning room in the dynamic adjustment of the room temperature; assuming that the room temperature fluctuates within a set range thereof before the current time, the room temperature variation at the current time is regarded as the deviation of the room temperature measurement value from the set value thereof;
ΔTr＝Tr(t)-Tsp (3)
ΔQL＝ΔQL(t)-QL(tsp) (4)
ΔGsup＝Gsup(t)-Gsup(tsp) (5)
wherein, tspIndicating the time when the room temperature satisfies a set value; t isspRepresenting a room temperature set value of the air-conditioning room; qLRepresenting the instantaneous sensible heat load of the room;
when the room temperature fluctuates around its set value, the amount of cooling supplied to the room from the end of the variable air volume is considered to be equal to the instantaneous load at that time, and then equation (1) is expressed as:
Figure FDA0002879838100000043
substituting formula (6) for formula (1) to obtain:
Figure FDA0002879838100000044
Figure FDA0002879838100000051
Δ G within a single control period when the room temperature fluctuates within its set rangesupΔTrIf the change is small and is ignored, the formula (7) is arranged into a state space equation expression form:
Figure FDA0002879838100000052
wherein the content of the first and second substances,
Figure FDA0002879838100000053
the conversion to the corresponding transfer function is:
Figure FDA0002879838100000054
for the transfer function shown as the formula (11), the corresponding PI controller parameter setting formula is shown as the formula (12);
Figure FDA0002879838100000055
Figure FDA0002879838100000056
wherein K represents a proportionality coefficient; τ represents the pure lag time coefficient; t represents an inertia time constant; kpExpressing a proportional coefficient in a setting formula; kiRepresents an integral coefficient;
and calculating the parameter setting result of the PI controller according to the corresponding relation between the expression (10) and the expression (11) and the expression (12).
CN202011640223.6A 2020-12-31 2020-12-31 Controller and method for automatically adjusting tail end of variable air volume air conditioner of public building Pending CN112833524A (en)

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