Energy-saving multi-target henhouse environment control system based on PLC and HMI

Abstract

The application provides an energy-saving multi-target henhouse environment control system based on PLC and HMI, which has the following characteristics: a user HMI end, an environment control PLC end and a device end, the environment control end comprises a current target parameter calculation module for obtaining corresponding target temperature T s , minimum ventilation V min and maximum ventilation V max ; a mode judgment module for calculating a current ventilation mode; a ventilation calculation module for calculating ventilation V; a fan judgment module for obtaining a to-be-controlled fan and corresponding ASP; a speed calculation module for calculating the speed v of the to-be-controlled fan; and a fan control signal generation module for generating an environment control signal of the corresponding fan according to the speed v. In summary, the method can better control the henhouse environment and save energy.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for poultry farming, specifically to an energy-saving multi-objective chicken house environmental control system based on PLC and HMI. Background Technology

[0002] In my country's transformation from a traditional agricultural powerhouse to a leading agricultural nation, precision farming will play a crucial role, necessitating the construction of a relatively strict farming environment. Therefore, real-time control of a series of environmental parameters, such as temperature, humidity, light intensity, and CO2 concentration, is essential. Currently, foreign countries have developed relatively complete farming processes, supporting intelligent equipment, and advanced feeding and management technologies. In recent years, significant progress and applications have been made in areas such as artificial intelligence recognition algorithms for livestock and poultry houses, quantitative and precise feeding control, precise environmental control within the houses, and remote real-time control via networks. The level of automatic environmental control technology is also gradually becoming more intelligent. Overall, research and practical products regarding the precision and low-energy consumption control of livestock and poultry farming environments are still relatively limited. Therefore, researching how to effectively control and manage the livestock farming environment to achieve harmony between livestock and the environment, while minimizing energy consumption, is of great practical significance.

[0003] Because the poultry farming environment is a complex system with multiple variables, nonlinearity, and coupled multiple parameters, achieving real-time and precise control of the farming environment is extremely difficult, regardless of whether it's a domestic or foreign environmental control product. In summary, while various types of environmental control systems for poultry farms, both domestic and international, have their own advantages and disadvantages in terms of functional details, human-machine interface, price, and energy consumption, they generally share the following problems:

[0004] (1) Currently, single-chip microcomputer systems are mainly used, which are not highly adaptable to the breeding environment and are prone to failure.

[0005] Livestock farms often require real-time environmental monitoring systems due to the potential for animal diseases caused by harmful gas emissions. However, most existing chicken coop control systems are based on microcontrollers and embedded systems, relying on regional networks for monitoring. Operating in complex environments with coupled temperature, humidity, and ammonia levels, these systems inevitably face various challenges, and communication signals are susceptible to interference. Consequently, the entire control system is prone to malfunctions, with some components, such as humidity probes, requiring replacement every few months. In farms with high annual thunderstorm days but inadequate lightning protection grounding, control systems are frequently damaged by lightning strikes, and the communication distance and quality of local area networks are often limited. Furthermore, the programs and functions of foreign environmental controllers are generally quite fixed; if the application results are unsatisfactory in China, foreign teams often struggle to provide timely and accurate modifications. Therefore, while using microcontrollers and embedded systems as environmental control systems for livestock farms solves many problems, certain limitations remain in their application.

[0006] (2) The current mainstream environmental control system mainly regulates temperature and ventilation volume, which leads to high energy consumption due to inaccurate ventilation volume.

[0007] Most current environmental control systems employ temperature difference control, meaning they largely use the target temperature within the animal shed as a baseline. When the actual temperature hasn't reached the target, the controller operates in minimum ventilation mode to ensure minimal respiratory output for the animals. When the actual temperature reaches or exceeds the target, the controller first calculates the temperature deviation and then selects an appropriate ventilation mode based on this difference. For example, when the temperature difference is small, the controller enters a transitional ventilation mode, controlling the activation of corresponding equipment during the transition phase. When the actual temperature exceeds the target by a certain margin, the controller enters a tunnel ventilation mode (proportional ventilation mode). In tunnel mode, the controller operates through multiple ventilation stages, each controlling different combinations of relays to start and stop different combinations of fans. Theoretically, each relay can control one or a small number of fans. This mode primarily focuses on temperature regulation and can indeed control the temperature. However, the parameter settings for each ventilation stage rely on the user's experience. Is the resulting ventilation volume truly suitable for the animals' respiratory or ventilation needs? Are the animals truly comfortable? However, this is not the key control point for this type of environmental controller. Especially in winter, there may be over-ventilation. Insufficient ventilation cannot guarantee the oxygen content in the shed, while excessive ventilation will waste fuel. Because excessive ventilation will lower the temperature in the shed, it is necessary to raise the temperature to reach the target temperature, thus wasting fuel. In addition, this ventilation control method of starting and stopping each relay means that at least one fan is started and stopped each time a relay is started and stopped, and multiple relays start and stop means multiple fans are started and stopped. This can easily lead to a sudden increase or decrease in the total ventilation volume, especially during the ventilation and transition ventilation stages, which can easily cause stress to poultry and livestock and have a significant impact on their health. Moreover, by directly starting and stopping one or more fans, the energy consumption of the fans also increases or decreases in stages, thus wasting electrical energy resources and resulting in high overall system energy consumption.

[0008] (3) The current algorithm cannot synchronously control important parameters such as ventilation volume, temperature, and negative pressure.

[0009] As a fully enclosed negative pressure breeding model, the breeding process requires comprehensive consideration of the animals' air volume requirements, indoor temperature, and changes in indoor negative pressure. Current mainstream environmental controllers' built-in algorithms do not achieve comprehensive control of these multiple important breeding objectives. It's possible that the temperature difference requirement is met, but the ventilation volume is inappropriate; or the ventilation volume is met, but the negative pressure is inappropriate.

[0010] In summary, developing an equipment system that meets the needs of modern, large-scale, automated, and low-energy-consumption poultry farming, capable of controlling conventional parameters such as temperature, humidity, and light, providing appropriate ventilation, ensuring constant negative pressure, stable and balanced temperature and humidity, and fresh air quality, and being freely expandable according to the needs of automated farming, is a pressing issue facing the industry. Summary of the Invention

[0011] This invention is made to solve the above problems, and its purpose is to provide an energy-saving multi-objective chicken house environmental control system based on PLC and HMI.

[0012] This invention provides an energy-saving multi-objective chicken house environmental control system based on PLC and HMI, characterized by: a user HMI terminal for user input of environmental control parameters; an environmental control PLC terminal for generating environmental control signals based on the environmental control parameters; and an equipment terminal including multiple fans installed in the chicken house for controlling fan operation according to the environmental control signals. The environmental control terminal is connected to both the user HMI terminal and the equipment terminal via wiring. The environmental control parameters include chicken parameters, current age, ventilation mode bandwidth parameters, ventilation mode fine-tuning ratio parameters, age-target temperature-minimum ventilation volume-maximum ventilation volume data, ventilation volume-fan data, and regression coefficients for the rotational speed and air volume formulas of each fan. The environmental control PLC terminal includes: an interaction module for receiving environmental control parameters sent from the user HMI terminal; a data storage module for storing the environmental control parameters; a temperature acquisition module including multiple temperature sensors installed at different locations in the chicken house for acquiring multiple temperature measurements; and a chicken house temperature calculation module for calculating the average value of all temperature measurements as the actual temperature of the chicken house. The current target parameter calculation module is used to obtain the corresponding target temperature based on the current age and the age-target temperature-minimum ventilation volume-maximum ventilation volume data. Minimum ventilation volume and maximum ventilation The mode determination module is used to determine the target temperature. Actual temperature The current ventilation mode is calculated based on the ventilation mode bandwidth parameters; the chicken count calculation module stores preset chicken count formulas, used to calculate the number of chickens in the chicken house based on the chicken parameters. The ventilation volume calculation module is used to adjust the proportional parameters based on the current ventilation mode and the number of chickens. Minimum ventilation volume and maximum ventilation Calculate the required ventilation volume The fan detection module is used to determine the required ventilation volume. The ventilation volume-fan data is used to obtain the fan to be controlled and the corresponding threshold judgment point; the static pressure acquisition module is used to collect the static pressure value in the chicken house. The speed calculation module stores preset speed and airflow formulas, which are used to calculate the speed of each fan to be controlled based on the corresponding speed formula regression coefficient, airflow formula regression coefficient, threshold judgment point, and static pressure value. The rotational speed of the fan to be controlled was calculated. The fan control signal generation module is used to generate signals based on the fan speed. Generate the corresponding environmental control signal for the fan.

[0013] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following feature: wherein the ventilation mode bandwidth parameter includes the minimum ventilation bandwidth. Transition ventilation bandwidth and tunnel ventilation bandwidth The mode determination module will determine the actual temperature. With target temperature Temperature deviation is obtained by subtraction. According to temperature deviation The specific process of obtaining the current ventilation mode from the ventilation mode bandwidth parameter is as follows: At this time, the current ventilation mode is the minimum ventilation mode; At this time, the current ventilation mode is the transitional ventilation mode; At this time, the current ventilation mode is tunnel ventilation mode; At this time, the current ventilation mode is the maximum ventilation mode.

[0014] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following feature: wherein the ventilation mode fine-tuning ratio parameter includes the minimum ventilation volume fine-tuning ratio. Fine-tuning the maximum ventilation volume ratio and maximum ventilation volume fine-tuning ratio In the ventilation volume calculation module, the required ventilation volume is calculated when the current ventilation mode is the minimum ventilation mode. The specific calculation formula is as follows: The required ventilation volume when the current ventilation mode is transitional ventilation mode. The specific calculation formula is as follows: The required ventilation volume when the current ventilation mode is tunnel ventilation mode. The specific calculation formula is as follows: , , In the formula To fine-tune the final air volume of ventilation, the required ventilation volume is determined when the current ventilation mode is the maximum ventilation mode. The specific calculation formula is as follows: .

[0015] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following feature: wherein the data of age-target temperature-minimum ventilation volume-maximum ventilation volume includes... The breeding data is set according to the existing breeding process manual. Each group of breeding data includes age in days, target temperature, minimum ventilation volume, and maximum ventilation volume. The current target parameter calculation module compares the current age in days with the age in each group of breeding data, and selects the breeding data corresponding to the age that is closest to or greater than the current age as the selected breeding data. The target temperature in the selected breeding data is taken as the target temperature. The minimum ventilation volume selected from the aquaculture data will be used as the minimum ventilation volume. The maximum ventilation volume was selected from the aquaculture data as the maximum ventilation volume. The chicken parameters include the initial number, the number of chickens transferred in, the number of chickens transferred out, the number of deaths, and the number of chickens culled. The formula for the number of chickens is: Number of Chickens = Initial quantity + Quantity transferred in - Quantity transferred out - Quantity of deaths - Quantity eliminated.

[0016] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following feature: wherein the ventilation volume-fan data is... The data for each group of fans includes the airflow switching point (ASP), energy efficiency ratio (ER), and at least one fan and its corresponding operating mode. The specific process for obtaining the fan to be controlled in the fan determination module is as follows: The required ventilation volume... Compare the ASP (Average Spinning Point) of the air volume switching point in the data of each fan group, and select the one that matches the required ventilation volume. The closest to and less than or equal to the required ventilation volume The fan data corresponding to the air volume switching point ASP is used as the selected fan data. Each fan in the selected fan data is used as the fan to be controlled. The air volume switching point ASP threshold point in the selected fan data is used as the threshold judgment point.

[0017] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following features: the operating modes include proportional mode, constant speed mode, and variable speed mode, and the speed is calculated in the speed calculation module. The calculation process is as follows: When the operating mode of the fan to be controlled is constant speed mode, , This is the full speed of the fan to be controlled; when the operating mode of the fan to be controlled is proportional mode, , The energy-saving ratio ER in the fan data corresponding to the fan to be controlled; when the operating mode of the fan to be controlled is variable speed mode, the speed. Based on the formulas for rotational speed and air volume, the expression for the rotational speed formula is as follows: In the formula , , , , and The regression coefficients are those for the rotational speed formula. To calculate air volume, calculate air volume. The expression is: In the formula The air volume of other fans in constant speed mode in the fan data corresponding to the fan to be controlled. The sum of The air volume of other fans in proportional mode in the fan data corresponding to the fan to be controlled. The sum of This represents the total number of fans in the fan data that have the same signal as the fan to be controlled, and the air volume. Calculated based on the air volume formula This is the threshold judgment point. The formula is expressed as follows: In the formula , , , , and The regression coefficient is the air volume formula.

[0018] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following features: the specific steps for obtaining the fan speed formula, air volume formula, speed formula regression coefficient, and air volume formula regression coefficient are as follows: Step S1, collect multiple sets of operating data when the fan is running, each set of operating data includes the detected air volume, detected speed, and detected static pressure value; Step S2, perform coarsening and dimensionless preprocessing on all operating data to obtain preprocessed data; Step S3, use a parameter regression tool to programmatically fit all preprocessed data to obtain the fan speed formula, air volume formula, speed formula regression coefficient, and air volume formula regression coefficient.

[0019] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following features: the equipment end further includes a power distribution cabinet and an end harmonic processing device. The power distribution cabinet includes multiple frequency converters connected to the motors of each fan, multiple branch circuit breakers connected to each frequency converter, and an upstream circuit breaker connected to all branch circuit breakers. The end harmonic processing device includes a power signal detection module, an analysis module, and a harmonic filtering module. The power signal detection module is used to collect the voltage and current values ​​output by the upstream circuit breaker. The analysis module is used to obtain a filtering control signal based on the voltage and current values. The harmonic filtering module is used to perform harmonic filtering on the voltage and current output by the upstream circuit breaker based on the filtering control signal, thereby reducing harmonic interference generated by the frequency converter.

[0020] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI provided by this invention may also have the following features: The environmental control parameters further include the start / stop time of the evaporative cooling pad pump, the opening degree of the evaporative cooling pad, the start / stop time of the small window, the opening degree of the small window, high and low static pressure thresholds, temperature difference levels, light switching time, preset brightness, preset temperature difference, preset temperature, and manure removal time. The environmental control terminal further includes: an evaporative cooling pad pump control module, used to control the evaporative cooling pad pump in the chicken house to start or stop according to the start / stop time, and to control the opening size of the evaporative cooling pad pump according to the opening degree of the evaporative cooling pad; a small window control module, used to control the opening or closing of the small windows in the chicken house according to the start / stop time of the small window, the high and low static pressure thresholds, and the temperature difference levels, and to control the opening size of the small windows according to the opening degree of the small windows; a lighting control module, used to control the lighting equipment in the chicken house to start or stop according to the light switching time, and to control the light brightness of the lighting equipment according to the preset brightness; and a heating equipment control module, used to control the actual temperature... The preset temperature and preset temperature difference control the operation or stop of the heating equipment in the chicken house; the manure cleaning control module is used to control the operation or stop of the manure cleaning equipment in the chicken house according to the manure cleaning time.

[0021] The role and effect of invention

[0022] The energy-saving multi-objective chicken house environmental control system based on PLC and HMI of this invention, in terms of hardware, adopts mature PLC and HMI technologies applicable to harsh industrial environments, avoiding the shortcomings of single-chip microcomputers or embedded systems that cannot be fully adapted to the breeding environment. In terms of software algorithms, by setting multiple sets of fan data with different airflow switching points (ASP) and corresponding operating modes for multiple fans, multiple fans can be controlled to operate in different modes under different ventilation requirements. This avoids the sudden increase in energy consumption of a single fan running at full speed and the stress on chickens caused by sudden changes in airflow and negative pressure due to sudden start-up and shutdown of fans, thereby achieving flexible switching of ventilation volume and overall system energy saving. Therefore, the energy-saving multi-objective chicken house environmental control system based on PLC and HMI designed in this invention can achieve energy saving while better controlling the chicken house environment. Attached Figure Description

[0023] Figure 1 This is a structural block diagram of the energy-saving multi-objective chicken house environmental control system in an embodiment of the present invention;

[0024] Figure 2 This is a structural block diagram of the user HMI terminal in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the chicken quantity setting screen in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the aquaculture parameter setting screen in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the temperature and ventilation settings screen in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the ventilation stage settings in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the variable speed fan parameter setting screen in an embodiment of the present invention;

[0030] Figure 8 This is a structural block diagram of the environmental control PLC terminal in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram illustrating the process of generating the air volume formula, the rotation speed formula, the air volume formula regression coefficient, and the rotation speed formula regression coefficient in an embodiment of the present invention.

[0032] Figure 10 This is a structural block diagram of the device side in an embodiment of the present invention. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the energy-saving multi-objective chicken house environmental control system based on PLC and HMI of this invention.

[0034] Figure 1 This is a structural block diagram of the energy-saving multi-objective chicken house environmental control system in an embodiment of the present invention.

[0035] like Figure 1 As shown, the energy-saving multi-objective chicken house environmental control system 100 includes a user HMI terminal 10, an environmental control PLC terminal 20, and an equipment terminal 30.

[0036] The user HMI terminal 10, i.e., the user human-machine interface terminal, is connected to the environmental control PLC terminal 20 via a line, i.e., a communication network 40, for users to input environmental control parameters and interact with the environmental control PLC terminal 20.

[0037] Figure 2 This is a structural block diagram of the user HMI terminal in an embodiment of the present invention.

[0038] like Figure 2 As shown, the user HMI terminal 10 includes a screen storage module 11, an input display module 12, a user HMI terminal communication module 13, and a user HMI terminal control module 14 that controls the above modules. The screen storage module stores the following screens: chicken quantity setting screen 111, breeding parameter setting screen 112, temperature and ventilation setting screen 113, ventilation stage setting screen 114, variable speed fan parameter setting screen 115, sensor setting screen 116, wet curtain pump setting screen 117, small window opening setting screen 118, lighting setting screen 119, heating equipment setting screen 120, and manure removal setting screen 121.

[0039] Figure 3 This is a schematic diagram of the chicken quantity setting screen in an embodiment of the present invention.

[0040] like Figure 3 As shown, the chicken quantity setting screen 111 is used by the user to input chicken parameters, and has an initial quantity input area 1111, an incoming quantity input area 1112, an outgoing quantity input area 1113, a death quantity input area 1114, a culling quantity input area 1115, and a chicken quantity display area 1116.

[0041] The initial quantity input area 1111 is used to input the initial quantity of chickens.

[0042] The number of chickens transferred in is entered in the input area 1112.

[0043] The number of chickens to be transferred is entered in the input area 1113.

[0044] The mortality count input area 1114 is used to input the number of chicken deaths.

[0045] The culling quantity input area 1115 is used to input the number of chickens to be culled.

[0046] In this embodiment, the inputs to the initial quantity input area 1111, the transfer-in quantity input area 1112, the transfer-out quantity input area 1113, the death quantity input area 1114, and the elimination quantity input area 1115 are all signed integers.

[0047] The chicken count display area 1116 is used to display the number of chickens.

[0048] Figure 4 This is a schematic diagram of the aquaculture parameter setting screen in an embodiment of the present invention.

[0049] like Figure 4 As shown, the aquaculture parameter setting screen 112 includes multiple sets of aquaculture data. Each set of aquaculture data includes age point 1121, age input area 1122, target temperature area 1123, minimum ventilation input area 1124, maximum ventilation input area 1125, and current age input area 1126.

[0050] The age point 1121 is used to display the sequence number of this group of breeding data.

[0051] The day input area 1122 is used for users to input their age in days. In this implementation, the day is entered in ascending order according to the serial number of the day point 1121.

[0052] The target temperature range 1123 is used by the user to input the target temperature corresponding to the age of the breeding data in this group, in degrees Celsius.

[0053] The minimum ventilation input area 1124 is used by the user to input the minimum ventilation volume corresponding to the age of the animals in this group of breeding data, in cubic meters per animal.

[0054] The maximum ventilation input area 1125 is used by users to input the maximum ventilation volume corresponding to the age of the animals in this group of breeding data, in cubic meters per animal.

[0055] The age, target temperature, minimum ventilation volume, and maximum ventilation volume for each set of breeding data were obtained based on existing breeding process manuals.

[0056] The current age display area 1126 is used by the user to input the current age of the chicken, in days.

[0057] Figure 5 This is a schematic diagram of the temperature and ventilation settings screen in an embodiment of the present invention.

[0058] like Figure 5 As shown, the temperature and ventilation setting screen 113 includes a minimum ventilation bandwidth input area 1131, a transition ventilation bandwidth input area 1132, a tunnel ventilation bandwidth input area 1133, a minimum ventilation volume fine-tuning ratio input area 1134, a fine-tuning ventilation volume maximum fine-tuning ratio 1135, a maximum ventilation volume fine-tuning ratio 1136, and a static pressure input area 1137.

[0059] Minimum ventilation bandwidth input area 1131 is used for users to input the minimum ventilation bandwidth. The unit is Celsius.

[0060] Transition ventilation bandwidth input area 1132 is used for user input of transition ventilation bandwidth. The unit is Celsius.

[0061] Tunnel ventilation bandwidth input area 1133 User input tunnel ventilation bandwidth The unit is Celsius.

[0062] Minimum ventilation volume fine-tuning ratio input area 1134 is used for users to input the minimum ventilation volume fine-tuning ratio. The unit is percentage.

[0063] Fine-tuning the ventilation volume: The maximum fine-tuning ratio is 1135, which is used by the user to input the maximum fine-tuning ratio of the ventilation volume. The unit is percentage.

[0064] Maximum ventilation volume fine-tuning ratio 1136 is used for user input of the maximum ventilation volume fine-tuning ratio. The unit is percentage.

[0065] Static pressure input area 1137 is used for users to input the default static pressure value of the chicken coop. The unit is Pascal.

[0066] Figure 6 This is a schematic diagram of the ventilation stage settings in an embodiment of the present invention.

[0067] like Figure 6 As shown, the ventilation stage setting screen 114 includes a stage display area 1141, an ASP input area 1142, an ER input area 1143, a fan setting area 1144, and a fan mode display area 1145, which are used to set and display 10 sets of fan data from VL1 to VL10.

[0068] The stage display area 1141 is used to display the stages of each group of fan data.

[0069] The ASP input area 1142 is used by the user to input the air volume switching point ASP for each group of fan data, in cubic meters per hour.

[0070] The ER input area 1143 is used for users to input the energy saving ratio ER, in percentage.

[0071] The fan setting area 1144 is used by the user to set the operating mode of the fan in the group of fan data by the corresponding fan icon. In this embodiment, the fans running in the group of fan data at this stage display the corresponding operating mode icon, and the fans that do not display the icon do not run in this stage.

[0072] In this embodiment, the ASP threshold for the airflow switching point is set at 2938 cubic meters per hour in the VL2 stage, and at 3525 cubic meters per hour in the VL3 stage. When the calculated required ventilation volume... When the value is greater than 2938 but not more than 3525, the system will operate in VL2 stage. During VL2 stage operation, the two pre-set fans in the corresponding fan data are in variable speed operation, causing changes in the indoor temperature and negative pressure. The new required ventilation volume is then determined based on the new temperature and negative pressure values ​​at the next moment. The system will then determine which ventilation stage's fan should be activated, ensuring a smooth transition when switching between adjacent stages (i.e., adjusting ventilation volume downwards or upwards). This avoids the stress on chickens caused by sudden changes in ventilation volume due to the simultaneous stopping or starting of multiple fans. Furthermore, energy consumption increases or decreases cubically with fan speed. Therefore, in each set of fan data, multiple fans operating at low speeds are used to meet ventilation requirements while reducing energy consumption. Additionally, energy consumption is further reduced by replacing the small fans' full-speed operation (constant speed mode) with larger fans operating at low speed (proportional or variable speed mode).

[0073] The fan mode display area 1145 is used to display the icons corresponding to the three operating modes: variable speed mode, constant speed mode, and proportional mode.

[0074] Figure 7 This is a schematic diagram of the variable speed fan parameter setting screen in an embodiment of the present invention.

[0075] like Figure 7 As shown, the variable speed fan parameter setting screen 115 includes an input area 1151 for the air volume formula regression coefficient and an input area 1152 for the speed formula regression coefficient.

[0076] The air volume formula regression coefficient input area 1151 is used by users to input the air volume formula regression coefficient for each fan.

[0077] The input area 1152 for the speed formula regression coefficient is used by the user to input the speed formula regression coefficient for each fan.

[0078] The sensor settings screen 116 is used by the user to enable or disable various sensors in the chicken coop. When a sensor is enabled, the data collected by the sensor is used for subsequent calculations. When a sensor is disabled, the data collected by the sensor is not used for subsequent calculations. In this embodiment, the sensor includes a temperature sensor.

[0079] The evaporative cooling pad pump settings screen 117 is used by the user to input the start and stop times of the evaporative cooling pad pump and the opening degree of the evaporative cooling pad.

[0080] Screen 118, which is used by users to input the window start / stop time, high and low static pressure thresholds, temperature difference level, and window opening.

[0081] The lighting settings screen 119 is used by the user to input the time to turn the lights on and off and the preset brightness.

[0082] The heating equipment settings screen 120 is used by the user to input the preset temperature difference and preset temperature.

[0083] The manure cleaning settings screen 121 is used by the user to input the manure cleaning time.

[0084] The input display module 12 is used to display the following screens: chicken quantity setting screen 111, breeding parameter setting screen 112, temperature and ventilation setting screen 113, ventilation stage setting screen 114, variable speed fan parameter setting screen 115, sensor setting screen 116, wet curtain water pump setting screen 117, small window opening setting screen 118, lighting setting screen 119, heating equipment setting screen 120, and manure removal setting screen 121, allowing users to make corresponding selections or input operations.

[0085] The user HMI communication module 13 is used to connect to the environmental control PLC terminal 20 via the communication network 40, and to transmit the minimum ventilation bandwidth. Transition ventilation bandwidth Tunnel ventilation bandwidth Minimum ventilation volume fine-tuning ratio Fine-tuning the maximum ventilation volume ratio Maximum ventilation volume fine-tuning ratio The following parameters are transmitted to the environmental control PLC terminal 20: age, target temperature, minimum ventilation volume, maximum ventilation volume, initial quantity, number of transferred-in quantity, number of transferred-out quantity, number of dead, number of eliminated, ventilation volume ASP threshold point, ratio ER, operating mode, speed formula regression coefficient, air volume formula regression coefficient, wet curtain water pump start-stop time, wet curtain opening degree, small window start-stop time, small window opening degree, high and low static pressure threshold, temperature difference level, light on / off time, preset brightness, preset temperature difference, preset temperature and manure cleaning time.

[0086] User HMI terminal control module 14 is used to control the operation of each module in user HMI terminal 10.

[0087] Figure 8 This is a structural block diagram of the environmental control PLC terminal in an embodiment of the present invention.

[0088] like Figure 8 As shown, the environmental control PLC terminal 20 is constructed using PLC technology adapted to harsh industrial environments, including an interaction module 201, a data storage module 202, a temperature acquisition module 203, a chicken house temperature calculation module 204, a current target parameter calculation module 205, a mode judgment module 206, a chicken quantity calculation module 207, a ventilation volume calculation module 208, a fan judgment module 209, a static pressure acquisition module 210, a speed calculation module 211, a fan control signal generation module 212, a wet curtain water pump control module 213, a small window control module 214, a lighting control module 215, a heating equipment control module 216, a manure cleaning control module 217, and an environmental control terminal control module 218 that controls the operation of the above modules.

[0089] The interaction module 201 is used to receive environmental control parameters sent by the user HMI terminal communication module 13.

[0090] Data storage module 202 is used to store environmental control parameters.

[0091] The temperature acquisition module 203 includes multiple temperature sensors installed at different locations in the chicken house to acquire multiple temperature measurement values.

[0092] The chicken house temperature calculation module 204 is used to calculate the average value of all temperature measurements as the actual temperature of the chicken house. .

[0093] The current target parameter calculation module 205 is used to obtain the corresponding target temperature based on the current age and the age-target temperature-minimum ventilation volume-maximum ventilation volume data. Minimum ventilation volume and maximum ventilation .

[0094] Specifically, the current target parameter calculation module 205 compares the current age with the ages in each group of breeding data, selects the breeding data corresponding to the age that is closest to and greater than or equal to the current age as the selected breeding data, and uses the target temperature in the selected breeding data as the target temperature. The minimum ventilation volume selected from the aquaculture data will be used as the minimum ventilation volume. The maximum ventilation volume was selected from the aquaculture data as the maximum ventilation volume. .

[0095] The mode determination module 206 is used to determine the target temperature. Actual temperature The current ventilation mode is obtained by calculating the bandwidth parameters of the ventilation mode.

[0096] Among them, the ventilation mode bandwidth parameter includes the minimum ventilation bandwidth. Transition ventilation bandwidth and tunnel ventilation bandwidth The mode determination module will determine the actual temperature. With target temperature Temperature deviation is obtained by subtraction. According to temperature deviation The specific process of obtaining the current ventilation mode from the ventilation mode bandwidth parameter is as follows:

[0097] At this time, the current ventilation mode is the minimum ventilation mode;

[0098] At this time, the current ventilation mode is the transitional ventilation mode;

[0099] At this time, the current ventilation mode is tunnel ventilation mode;

[0100] At this time, the current ventilation mode is the maximum ventilation mode.

[0101] The chicken count calculation module 207 stores a preset chicken count formula, which is used to calculate the number of chickens in the chicken house based on the chicken parameters. The data is transmitted to the user HMI terminal 10 via the communication network 40, so that the chicken count display area 1116 displays the chicken count to the user. .

[0102] The formula for the number of chickens is as follows:

[0103] Number of chickens = Initial quantity + Quantity transferred in - Quantity transferred out - Quantity of deaths - Quantity eliminated.

[0104] The ventilation volume calculation module 208 is used to calculate the ventilation volume based on the current ventilation mode, the ventilation mode fine-tuning ratio parameter, and the number of chickens. Minimum ventilation volume and maximum ventilation Calculate the required ventilation volume .

[0105] Among them, the ventilation mode fine-tuning ratio parameter includes the minimum ventilation volume fine-tuning ratio. Fine-tuning the maximum ventilation volume ratio and maximum ventilation volume fine-tuning ratio .

[0106] In the ventilation volume calculation module 208, the required ventilation volume is calculated when the current ventilation mode is the minimum ventilation mode. The specific calculation formula is as follows:

[0107] .

[0108] Required ventilation volume when the current ventilation mode is transitional ventilation mode The specific calculation formula is as follows:

[0109] .

[0110] The required ventilation volume when the current ventilation mode is tunnel ventilation mode The specific calculation formula is as follows:

[0111] ,

[0112] ,

[0113] ,

[0114] In the formula To fine-tune the final air volume of ventilation.

[0115] The required ventilation volume when the current ventilation mode is the maximum ventilation mode The specific calculation formula is as follows:

[0116] .

[0117] The fan detection module 209 is used to determine the required ventilation volume. The ventilation volume and fan data are used to obtain the fan to be controlled and the corresponding threshold judgment point.

[0118] Among them, the ventilation volume minus the fan data is: The data for each group of fans includes the airflow switching point (ASP), energy saving ratio (ER), and at least one fan and its corresponding operating mode. In this embodiment... .

[0119] The specific process of obtaining the fan to be controlled in the fan judgment module 209 is as follows:

[0120] Demand ventilation volume Compare the ASP (Average Spinning Point) of the air volume switching point in the data of each fan group, and select the one that matches the required ventilation volume. The closest to and less than or equal to the required ventilation volume The fan data corresponding to the air volume switching point ASP is used as the selected fan data. Each fan in the selected fan data is used as the fan to be controlled. The air volume switching point ASP threshold point in the selected fan data is used as the threshold judgment point.

[0121] The static pressure acquisition module 210 is used to collect static pressure values ​​in the chicken coop. .

[0122] The speed calculation module 211 stores preset speed formulas, which are used to determine the up and down pressure values ​​for each fan to be controlled based on the corresponding speed formula regression coefficient, air volume formula regression coefficient, and threshold. The rotational speed of the fan to be controlled was calculated. .

[0123] In the speed calculation module 211, the speed is... The calculation process is as follows:

[0124] When the operating mode corresponding to the fan to be controlled is constant speed mode , This refers to the full speed of the fan to be controlled;

[0125] When the operating mode corresponding to the fan to be controlled is proportional mode , The energy-saving ratio ER in the fan data corresponding to the fan to be controlled;

[0126] When the operating mode of the fan to be controlled is variable speed mode, the speed is It is calculated based on the rotational speed formula and the air volume formula.

[0127] The expression for the rotational speed formula is:

[0128] ,

[0129] In the formula , , , , and The regression coefficients are those for the rotational speed formula. To calculate air volume, in this embodiment, the static pressure input area 1137 contains a default static pressure value input by the user. At that time, the static pressure value Substituting the values ​​into the above speed formula, the speed is calculated. The static pressure input area 1137 does not contain a static pressure value input by the user. At that time, the static pressure value collected in real time by the static pressure acquisition module 210 will be... Substituting the values ​​into the above speed formula, the speed is calculated. .

[0130] Calculate air volume The expression is:

[0131] ,

[0132] In the formula The air volume of other fans in constant speed mode in the fan data corresponding to the fan to be controlled. The sum of The air volume of other fans in proportional mode in the fan data corresponding to the fan to be controlled. The sum of This represents the total number of fans in the fan data that have the same signal as the fan to be controlled, and the air volume. Calculated based on the air volume formula This is the threshold judgment point.

[0133] The formula is expressed as follows:

[0134] ,

[0135] In the formula , , , , and The regression coefficient is the air volume formula.

[0136] In this embodiment, in order to improve computing efficiency, when a set of wind turbine data contains multiple operating wind turbines of different models, only one model of wind turbine is set to variable speed mode.

[0137] In this embodiment, the wind turbine includes multiple operating parameters. Multivariate regression modeling can approximate the measured points by adding higher-order terms of the independent variables to obtain satisfactory fitting results. Moreover, polynomials can approximate any function piecewise. Therefore, by collecting multiple sets of wind turbine operating data and using the multivariate regression modeling method for regression analysis, the optimal regression model is obtained by evaluating the regression model, and finally the ideal wind turbine characteristic equation is obtained.

[0138] Figure 9 This is a schematic diagram illustrating the process of generating the air volume formula, the rotation speed formula, the air volume formula regression coefficient, and the rotation speed formula regression coefficient in an embodiment of the present invention.

[0139] like Figure 9 As shown, the process of generating the air volume formula, speed formula, air volume formula regression coefficient, and speed formula regression coefficient for the fan includes the following steps:

[0140] Step S1: Collect multiple sets of operating data when the fan is running. Each set of operating data includes the detected air volume, detected speed and detected static pressure value.

[0141] Step S2: Perform coarsening and dimensionless preprocessing on all running data to obtain preprocessed data.

[0142] Step S3: Using a parametric regression tool and all preprocessed data, programmatic fitting is performed to obtain the corresponding speed formula and speed formula regression coefficients for the wind turbine.

[0143] In this embodiment, fitting analysis was performed using Origin software. After multiple comparisons and evaluations, the wind turbine characteristic equation was obtained: Unknown parameter = A + B × Known parameter 1 + C × Known parameter 2 + D × Known parameter 1 2 +E×Known parameter 2 2 +F×Known parameter 1×Known parameter 2, where A~F are the regression coefficients of the fan characteristic equation. Based on the fan characteristic equation and operating data, the speed formula and its corresponding regression coefficient, as well as the air volume formula and its corresponding regression coefficient, can be obtained. The calculated speed is obtained by substituting the actual measured negative pressure and measured air volume into the speed formula and its regression coefficients. The speed error is then compared with the measured speed, as shown in the table below.

[0144] Measured negative pressure (Pa) <![CDATA[Measured air volume (m 3 / h)]]> Measured rotational speed (RPM) Calculate rotational speed (RPM) Speed ​​error (RPM) 0 39373.26327 1130 1136 -6 25 38301.714 1130 1136 -6 50 37063.026 1130 1133 -3 75 35878.194 1130 1134 -4 100 34445.961 1130 1132 -2 125 33111.342 1130 1135 -5 150 31549.518 1130 1138 -8 175 29230.344 1130 1134 -4 200 26365.878 1130 1131 -1 225 23917.113 1130 1143 -13 0 38425.21254 1100 1107 -7 25 37352.502 1100 1109 -9 50 35928.684 1100 1103 -3 75 34757.316 1100 1107 -7 100 33328.449 1100 1108 -8 125 31776.723 1100 1110 -10 150 29903.544 1100 1110 -10 175 27442.998 1100 1108 -8 200 24588.63 1100 1110 -10 225 18336.285 1100 1096 4 0 37403.85033 1070 1075 -5 25 36376.362 1070 1081 -11 50 34861.662 1070 1075 -5 75 33543.873 1070 1078 -8 100 32003.928 1070 1079 -9 125 30442.104 1070 1084 -14

[0145] The first, second, and third columns in the table above represent the measured negative pressure, measured air volume, and measured speed of the fan during actual operation, respectively. The fourth column represents the calculated speed obtained by substituting the measured negative pressure and measured air volume into the fan's speed formula and combining it with the speed formula regression coefficient. The fifth column represents the difference between the calculated speed and the measured speed, i.e., the speed error. As can be seen, the speed error has been kept within a small usable range, meaning that the fitted speed equation and the calculated speed formula regression coefficient can be used to accurately predict the fan's speed.

[0146] The fan control signal generation module 212 is used to generate signals based on the fan speed. Generate the corresponding environmental control signal for the fan.

[0147] The wet curtain water pump control module 213 is used to automatically control the opening or closing of the wet curtain water pump in the chicken house according to the start and stop time of the wet curtain water pump, and to automatically control the opening size of the wet curtain water pump according to the opening degree of the wet curtain. In this embodiment, the wet curtain water pump control module 213 can also control the wet curtain water pump in real time according to the user's real-time instructions, so as to realize the user's manual control.

[0148] The small window control module 214 is used to automatically control the opening or closing of the small windows in the chicken house according to the small window start and stop time, high and low static pressure thresholds and temperature difference levels, and to automatically control the opening size of the small window according to the small window opening degree. In this embodiment, the small window control module 214 can also control the small window in real time according to the user's real-time instructions, so as to realize the user's manual control.

[0149] The lighting control module 215 is used to automatically control the lighting equipment in the chicken coop to turn on or off according to the switching time, and to automatically control the light brightness of the lighting equipment according to the preset brightness. In this embodiment, the lighting control module 215 can also control the lighting equipment in real time according to the user's real-time instructions, so as to realize the user's manual control.

[0150] The heating equipment control module 216 is used to adjust the temperature according to the actual temperature. The heating equipment in the chicken house is automatically controlled to run or stop based on preset temperature and preset temperature difference. In this embodiment, the heating equipment control module 216 can also generate high and low temperature alarms and other information.

[0151] The manure removal control module 217 is used to automatically control the operation or stop of the manure removal equipment in the chicken house according to the preset manure removal time.

[0152] The environmental control terminal control module 218 stores a control program used to control the operation of each module in the environmental control PLC terminal 20.

[0153] Figure 10 This is a structural block diagram of the device side in an embodiment of the present invention.

[0154] like Figure 10 As shown, the equipment terminal 30 includes multiple fans 31 installed in the chicken house, a power distribution cabinet 32, and a terminal harmonic processing device 33. The equipment terminal 30 is connected to the environmental control PLC terminal 20 through the communication network 40, and controls the operation of the corresponding fans 31 according to the environmental control signals transmitted by the environmental control PLC terminal 20.

[0155] The distribution cabinet 32 ​​includes multiple frequency converters 321 connected to the motors 311 of each fan 31, multiple branch circuit breakers 322 connected to each frequency converter 321, and an upstream circuit breaker 323 connected to all branch circuit breakers 322. In this embodiment, the distribution cabinet 32 ​​also includes power supply devices such as contactors, thermal protection devices, switching power supplies, intermediate relays, current transformers, fuses, surge protectors, copper busbars, terminal accessories, and isolation transformers, for stable power supply.

[0156] The end harmonic processing device 33 includes an electrical signal detection module 331, an analysis module 332, and a harmonic filtering module 333.

[0157] The power signal detection module 331 is used to collect the voltage and current values ​​output by the upstream circuit breaker 323.

[0158] Analysis module 332 is used to obtain a filtered control signal based on the voltage and current values.

[0159] The harmonic filtering module 333 is used to perform harmonic filtering on the voltage and current output by the upstream circuit breaker 323 according to the filtering control signal, thereby reducing the harmonic interference generated by the frequency converter 321.

[0160] The role and effect of the embodiments

[0161] According to the energy-saving multi-objective chicken house environmental control system based on PLC and HMI involved in this embodiment, by setting multiple sets of fan data with different ventilation volume ASP threshold points and corresponding multiple fan operation modes, multiple fans can be controlled to operate in different operation modes under different ventilation volume requirements. This avoids the sudden increase in energy consumption of a single fan when it is running at full speed and the stress on chickens caused by sudden changes in air volume and negative pressure due to sudden start and stop of the fan, thereby realizing flexible switching of ventilation volume and overall energy saving of the system.

[0162] By using multiple regression modeling to obtain the wind turbine characteristic equation, and then using actual operating data and the wind turbine characteristic equation to obtain the speed formula and speed formula regression coefficient for each different type of wind turbine, the accurate prediction of wind turbine speed can be achieved.

[0163] Based on the internal relationship between temperature difference control and ventilation volume control, the temperature requirements of chickens in the breeding process manual are mapped to the ventilation volume control mode, and then the temperature requirements of chickens are met by controlling the fans.

[0164] By using a terminal harmonic processing device to analyze the voltage and current of the distribution cabinet in real time and perform harmonic filtering, the pollution of the power grid caused by harmonics generated by the frequency converter can be reduced.

[0165] In summary, this method can better control the chicken house environment while achieving energy conservation.

[0166] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. An energy-saving multi-objective chicken house environmental control system based on PLC and HMI, characterized in that, include: The user HMI terminal is used for users to input environmental control parameters; The environmental control PLC terminal is used to generate environmental control signals based on the environmental control parameters. On the equipment side, there are multiple fans installed in the chicken coop, used to control the operation of the fans according to the environmental control signals. The environmental control PLC terminal is connected to both the user HMI terminal and the device terminal via wiring. The environmental control parameters include chicken parameters, current age, ventilation mode bandwidth parameters, ventilation mode fine-tuning ratio parameters, age-target temperature-minimum ventilation volume-maximum ventilation volume data, ventilation volume-fan data, and regression coefficients for the rotational speed formula and air volume formula for each of the aforementioned fans. The ventilation mode bandwidth parameters include minimum ventilation bandwidth. Transition ventilation bandwidth and tunnel ventilation bandwidth ; The environmental control PLC terminal includes: The interaction module is used to receive the environmental control parameters sent by the user HMI terminal; A data storage module is used to store the environmental control parameters; The temperature acquisition module includes multiple temperature sensors installed at different locations in the chicken house to acquire multiple temperature measurement values. The chicken coop temperature calculation module is used to calculate the average value as the actual temperature of the chicken coop based on all the temperature measurements. ; The current target parameter calculation module is used to obtain the corresponding target temperature based on the current age and the age-target temperature-minimum ventilation volume-maximum ventilation volume data. Minimum ventilation volume and maximum ventilation ; The mode determination module is used to determine the target temperature. The actual temperature The current ventilation mode is calculated using the bandwidth parameters of the ventilation mode. The mode determination module will determine the actual temperature. With the target temperature Temperature deviation is obtained by subtraction. According to the temperature deviation The specific process of obtaining the current ventilation mode from the ventilation mode bandwidth parameter is as follows: At this time, the current ventilation mode is the minimum ventilation mode; At this time, the current ventilation mode is a transitional ventilation mode; At that time, the current ventilation mode is the tunnel ventilation mode; At that time, the current ventilation mode is the maximum ventilation mode; The chicken count calculation module stores preset chicken count formulas and is used to calculate the number of chickens in the chicken house based on the chicken parameters. ; The ventilation volume calculation module is used to calculate the ventilation volume based on the current ventilation mode, the ventilation mode fine-tuning ratio parameter, and the number of chickens. The minimum ventilation volume and the maximum ventilation volume Calculate the required ventilation volume ; The fan detection module is used to determine the required ventilation volume. The ventilation volume-fan data are used to obtain the fan to be controlled and the corresponding threshold judgment point, wherein the threshold judgment point is the air volume switching point ASP in the selected fan data; The static pressure acquisition module is used to collect the static pressure value in the chicken house. ; The rotational speed calculation module stores preset rotational speed formulas and airflow formulas. It is used to calculate the rotational speed formula regression coefficient, the airflow formula regression coefficient, the threshold judgment point, and the static pressure value for each of the fans to be controlled. The rotational speed of the fan to be controlled was calculated. ; The fan control signal generation module is used to generate signals based on the speed. Generate the environmental control signal corresponding to the fan.

2. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI according to claim 1, characterized in that: in, The ventilation mode fine-tuning ratio parameter includes the minimum ventilation volume fine-tuning ratio. Fine-tuning the maximum ventilation volume ratio and maximum ventilation volume fine-tuning ratio , In the ventilation volume calculation module, the required ventilation volume is defined as the current ventilation mode being the minimum ventilation mode. The specific calculation formula is as follows: ， The required ventilation volume when the current ventilation mode is transitional ventilation mode. The specific calculation formula is as follows: ， The required ventilation volume when the current ventilation mode is tunnel ventilation mode The specific calculation formula is as follows: ， ， ， In the formula To fine-tune the final air volume of ventilation, The required ventilation volume when the current ventilation mode is the maximum ventilation mode. The specific calculation formula is as follows: 。 3. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI according to claim 1, characterized in that: in, The age-target temperature-minimum ventilation-maximum ventilation data includes The breeding data set by each group is based on existing breeding process manuals. The breeding data for each group includes age in days, target temperature, minimum ventilation volume, and maximum ventilation volume. The current target parameter calculation module compares the current age with the ages in each group of aquaculture data, selects the aquaculture data corresponding to the age that is closest to and greater than or equal to the current age as the selected aquaculture data, and uses the target temperature in the selected aquaculture data as the target temperature. The minimum ventilation volume in the selected aquaculture data is taken as the minimum ventilation volume. The maximum ventilation volume in the selected aquaculture data is taken as the maximum ventilation volume. , The chicken parameters include the initial number, the number transferred in, the number transferred out, the number of deaths, and the number of culled. The formula for the number of chickens is: Number of chickens = Initial quantity + Quantity transferred in - Quantity transferred out - Quantity of deaths - Quantity eliminated.

4. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI according to claim 1, characterized in that: in, The ventilation volume-fan data is as follows: The data for each set of fans includes the airflow switching point (ASP), energy saving ratio (ER), and at least one fan and its corresponding operating mode. The specific process of obtaining the fan to be controlled in the fan determination module is as follows: The required ventilation volume The selected fan data is compared with the airflow switching point ASP in each group of fan data, and the selected fan data is the one that matches the required ventilation volume. The closest to and less than or equal to the required ventilation volume The fan data corresponding to the air volume switching point ASP is used to select each fan in the selected fan data as the fan to be controlled.

5. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI as described in claim 4, Its features are: in, The operating modes include proportional mode, constant speed mode, and variable speed mode. In the speed calculation module, the speed The calculation process is as follows: When the operating mode corresponding to the fan to be controlled is constant speed mode , This refers to the full speed of the fan to be controlled; When the operating mode corresponding to the fan to be controlled is proportional mode , The energy-saving ratio ER in the fan data corresponding to the fan to be controlled; When the operating mode of the fan to be controlled is variable speed mode, the speed is Calculated based on the aforementioned rotational speed formula and air volume formula. The expression for the rotational speed formula is: ， In the formula , , , , and The regression coefficients of the aforementioned rotational speed formula are... To calculate air volume, Calculate air volume The expression is: ， In the formula The air volume of other fans in constant speed mode in the fan data corresponding to the fan to be controlled. The sum of The air volume of other fans in the proportional mode of the fan data corresponding to the fan to be controlled. The sum of The total number of fans in the fan data that have the same signal as the fan to be controlled, and the air volume. Calculated according to the aforementioned air volume formula. The threshold judgment point, The expression for the air volume formula is as follows: ， In the formula , , , , and The regression coefficient for the air volume formula is denoted as .

6. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI as described in claim 5, Its features are: in, The specific steps for obtaining the fan's rotational speed formula, air volume formula, regression coefficient of the rotational speed formula, and regression coefficient of the air volume formula are as follows: Step S1: Collect multiple sets of operating data when the fan is running. Each set of operating data includes the detected air volume, detected rotational speed, and detected static pressure value. Step S2: Perform coarsening and dimensionless preprocessing on all the running data to obtain preprocessed data; Step S3: Using a parametric regression tool and all the preprocessed data, programmatic fitting is performed to obtain the speed formula, air volume formula, speed formula regression coefficient, and air volume formula regression coefficient corresponding to the fan.

7. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI according to claim 1, characterized in that: in, The equipment also includes a power distribution cabinet and a terminal harmonic processing device. The power distribution cabinet includes multiple frequency converters connected to the motors of each of the aforementioned fans, multiple branch circuit breakers connected to each of the aforementioned frequency converters, and an upstream circuit breaker connected to all of the aforementioned branch circuit breakers. The terminal harmonic processing device includes an electrical signal detection module, an analysis module, and a harmonic filtering module. The power signal detection module is used to collect the voltage and current values ​​output by the upstream circuit breaker. The analysis module is used to obtain a filtered control signal based on the voltage value and the current value. The harmonic filtering module is used to perform harmonic filtering on the voltage and current output by the upstream circuit breaker according to the filtering control signal, thereby reducing harmonic interference generated by the frequency converter.

8. The energy-saving multi-objective chicken house environmental control system based on PLC and HMI as described in claim 1, Its features are: in, The environmental control parameters also include the start / stop time of the evaporative cooling pad pump, the opening degree of the evaporative cooling pad, the start / stop time of the small window, the opening degree of the small window, the high and low static pressure thresholds, the temperature difference level, the light on / off time, the preset brightness, the preset temperature difference, the preset temperature, and the manure cleaning time. The environmental control PLC terminal also includes: The evaporative cooling pad pump control module is used to control the evaporative cooling pad pump in the chicken house to start or stop according to the start and stop time of the evaporative cooling pad pump, and to control the opening size of the evaporative cooling pad pump according to the opening degree of the evaporative cooling pad. The small window control module is used to control the opening or closing of the small windows in the chicken house according to the small window start and stop time, the high and low static pressure thresholds and the temperature difference level, and to control the opening size of the small window according to the small window opening degree. The lighting control module is used to control the lighting equipment in the chicken coop to turn on or off according to the lighting switching time, and to control the light brightness of the lighting equipment according to the preset brightness. The heating equipment control module is used to control the heating equipment according to the actual temperature. The preset temperature and the preset temperature difference control the operation or shutdown of the heating equipment in the chicken house; The manure removal control module is used to control the operation or shutdown of the manure removal equipment in the chicken house according to the manure removal time.

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