Air conditioner control system for wind power cabin and control method of air conditioner control system

Abstract

The invention discloses an air conditioner control system and method for a wind power cabin, the air conditioner control system comprises a main controller, an air conditioning unit and a man-machine interaction unit, and the air conditioner control system is used for temperature regulation of the wind power cabin; the main controller is configured to complete air conditioning unit control based on sensing data collected by all sensors in an air conditioning unit loop. And the man-machine interaction unit is connected with the main controller and is used for completing interaction between sensing data and control data. According to the invention, by taking the stable control of the temperature in the cabin as a core target, through the hierarchical logic of startup initialization, parameter configuration, alarm detection, temperature judgment, multi-module cooperation, PID closed-loop regulation and cyclic feedback, and in combination with engineering details of sensor calibration, a PID algorithm, equipment driving and the like, the accurate regulation and control of the temperature of the wind power cabin are realized; and safe operation of equipment in the cabin is guaranteed.

Description

Technical Field

[0001] This application belongs to the field of wind power equipment temperature control technology, and in particular relates to an air conditioning control system and control method for wind turbine nacelles. Background Technology

[0002] During operation, key equipment inside the nacelle of a wind turbine generator set (such as the generator, gearbox, converter, and control system) generates a significant amount of heat. Simultaneously, external environmental factors (such as high temperature, low temperature, high humidity, and salt spray corrosion) also affect the internal temperature of the nacelle. Excessive temperature can accelerate the aging of insulation materials, affecting the lifespan of electrical equipment, degrading the performance of lubricating oils / greases, exacerbating gearbox wear, causing control system malfunctions, and impacting the stability of the wind turbine's operation.

[0003] Therefore, the air conditioning system of the wind turbine nacelle is crucial to ensuring the reliable operation of the unit. Summary of the Invention

[0004] The purpose of this application is to overcome the problems of the prior art by disclosing an air conditioning control system and control method for wind turbine nacelles. This application focuses on the stable control of the nacelle temperature as the core objective. It achieves precise temperature control and safe operation of the equipment through a hierarchical logic of "start-up initialization → parameter configuration → alarm detection → temperature determination → multi-module collaboration → PID closed-loop adjustment → cyclic feedback" combined with engineering details such as sensor calibration, PID algorithm, and equipment drive.

[0005] On the one hand, the objective of this application is achieved through the following technical solution: An air conditioning control system for a wind turbine nacelle, the air conditioning control system comprising: a main controller, an air conditioning unit and a human-machine interface unit, for temperature regulation of the wind turbine nacelle; The main controller is configured to control the air conditioning unit based on the sensor data collected by each sensor in the air conditioning unit loop; The human-machine interaction unit is connected to the main controller and is used to complete the interaction between sensor data and control data.

[0006] According to a preferred embodiment, the air conditioning unit includes: a compressor, an evaporator coil, an evaporator fan, an exhaust pressure sensor, an intake pressure sensor, an exhaust temperature sensor, an intake temperature sensor, a first ambient temperature sensor, a temperature and humidity sensor, a condenser coil, a condenser fan, and a second ambient temperature sensor. The outlet end of the condenser coil is connected to the expansion valve, evaporator coil, compressor and high-pressure switch in sequence via a steel pipe, and then connected to the inlet end of the condenser coil. A condenser fan is installed at the condenser coil and an evaporator fan is installed at the evaporator coil, thus forming an air conditioning unit loop. Among them, an exhaust pressure sensor is provided upstream of the expansion valve, an intake temperature sensor and an intake pressure sensor are provided sequentially between the evaporator coil and the compressor, and an exhaust temperature sensor is provided between the compressor and the high-pressure switch. Furthermore, the exhaust pressure sensor, expansion valve, evaporator coil, intake temperature sensor, intake pressure sensor, compressor, exhaust temperature sensor, and high-pressure switch are located inside the wind turbine nacelle, and a temperature and humidity sensor is also installed inside the wind turbine nacelle; the condenser coil is located outside the wind turbine nacelle.

[0007] According to a preferred embodiment, a first charging valve is further provided downstream of the condensing coil, the first charging valve being located outside the wind turbine nacelle; a second charging valve is further provided between the evaporating coil and the suction temperature sensor.

[0008] On the other hand, this application also discloses: A control method for an air conditioning control system, the control method comprising: S1: After receiving the power-on command, the air conditioning control system executes the hardware power-on and self-test process and determines whether it meets the power-on standards. S2: When the air conditioning control system starts up according to the standard, the main controller determines the difference between the set target temperature and the cabin temperature and adjusts the cooling accordingly. S3: If the temperature inside the cabin is lower than the target temperature by the hysteresis value, the fan will stop running, the compressor will enter the hot standby state, and the equipment will be in standby mode. S4: If the temperature inside the cabin is higher than the target temperature, the main controller identifies the temperature difference between the inside and outside of the cabin, starts the external industrial frequency cooling fan, and simultaneously starts the compressor and the internal variable frequency fan, starting operation at the lowest frequency first. S5: The cabin temperature sensor provides real-time temperature feedback. The main controller determines whether the current cabin temperature is lower than the target temperature hysteresis value. If it is lower than the target temperature hysteresis value, it returns to step S3; otherwise, it returns to step S4.

[0009] According to a preferred embodiment, step S1 includes: S11: Air conditioning control system self-test, including: temperature sensor self-test and actuator self-test; S12: Air conditioning control system parameter configuration, including: basic parameter configuration and PID parameter tuning; S13: The main controller determines whether there is an alarm that does not meet the startup requirements based on the returned sensor data. If there is no corresponding alarm, proceed to step S2; otherwise, return to S11.

[0010] According to a preferred embodiment, step S12 includes: Basic parameter configuration: Set target temperature Temperature hysteresis Compressor frequency =[20Hz, 120Hz], In-cabin fan speed[ =[500rpm, 3000rpm], PID output range [0, ] = [0%, 100%]; PID parameter tuning: make =0, =0, gradually increase the proportional gain Until the air conditioning control system outputs a constant amplitude oscillation, the critical proportional gain is recorded. and oscillation period ; Calculate PID parameters: =0.6 , = , = .

[0011] According to a preferred embodiment, step S13 includes: Fault detection settings: Compressor overcurrent: > ,in This is the default value; Overheating inside the cabin: > ,in This is the default value; Sensor malfunction: Three consecutive temperature jump values ​​|Tin(k) sampled. Tin(k 1) |>5℃; Alarm Response: Perform alarm clearance to troubleshoot and resolve the fault; Alarm upload: Upload fault codes via Modbus RTU communication protocol, including: 0x01 for compressor overcurrent, 0x02 for cabin overtemperature.

[0012] According to a preferred embodiment, step S2 includes: after the system is started, the start-up and shutdown conditions of the equipment are determined by digital filtering and temperature difference calculation in order to balance energy consumption and temperature control accuracy. The digital filter employs a moving average with a window size of N=5 to suppress temperature fluctuation interference and improve control stability. : ,in This indicates the temperature inside the cabin.

[0013] According to a preferred embodiment, step S3 includes: Shutdown conditions:

[0014] When the shutdown condition is met, the fan stops running, the compressor goes into hot standby, and all equipment in the system goes into standby mode; if the shutdown condition is not met, the temperature difference is identified, and multi-module coordinated adjustment is initiated. Multi-module coordinated adjustment, specifically including: compressor frequency adjustment, cabin outside air fan adjustment, and cabin inside air fan adjustment.

[0015] According to a preferred embodiment, compressor frequency regulation includes: PID Discrete Formula:

[0016] in ; Integral anti-saturation treatment: like ,but The excess will be accumulated into the next integration to prevent the PID output from exceeding the limit and causing equipment overload; Compressor frequency mapping:

[0017] Hardware driver: The frequency converter receives frequency commands to control the compressor motor speed; The adjustment process of the cabin air supply fan includes: Fan PID speed control: By supply air temperature For the goal but: Calculate the deviation

[0018] After executing the PID, it is mapped to the motor speed: .

[0019] The aforementioned main solution and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application. Those skilled in the art, after understanding the solution of this application, will realize that there are many combinations based on the prior art and common general knowledge, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0020] The beneficial effects of this application are: 1. Fault safety assurance: Through the "alarm priority judgment-processing-reset" mechanism, we ensure rapid loss prevention and avoid chain reactions in the event of system failure; 2. Energy efficiency optimization: Dynamically adjust the operating power of fans and compressors according to temperature differences (e.g., mains frequency → minimum frequency → shutdown) to reduce energy consumption in low-load scenarios; 3. Improved response speed: Multi-module collaborative scheduling (such as full-speed fan replacement + low-frequency compressor pre-cooling + PID fine-tuning of air supply) shortens the temperature convergence time and avoids the lag of single-module adjustment; 4. Precise temperature control: The PID algorithm combined with real-time temperature difference feedback achieves dynamic matching of cooling / heating capacity, keeping temperature fluctuations within a very small range (such as ±0.5℃). Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the air conditioning control system for wind turbine nacelles used in this application. In the diagram, comp101 is the compressor, PT101 is the discharge pressure sensor, PT102 is the suction pressure sensor, TE101 is the discharge temperature sensor, TE102 is the suction temperature sensor, PS101 is the high-pressure switch, TE103 is the ambient temperature sensor, Coil101 is the condenser coil, Fan101 is the condenser fan, Coil102 is the evaporator coil, Fan102 is the evaporator fan, TRT is the temperature and humidity sensor, C101 is the first charging valve, C102 is the second charging valve, and EXV101 is the expansion valve. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Furthermore, it should be noted that unless otherwise specified in this application, the specific structures, connections, positions, power sources, etc. involved are all things that a person skilled in the art can know without creative effort based on the prior art.

[0025] Example 1 refer to Figure 1 As shown in the figure, an air conditioning control system for a wind turbine nacelle is illustrated. The air conditioning control system includes a main controller, an air conditioning unit, and a human-machine interface unit, and is used for temperature regulation of the wind turbine nacelle.

[0026] The main controller is configured to control the air conditioning unit based on sensor data collected by each sensor in the air conditioning unit circuit; the human-machine interface unit is connected to the main controller and is used to complete the interaction between sensor data and control data.

[0027] Preferably, the air conditioning unit includes: a compressor, an evaporator coil, an evaporator fan, an exhaust pressure sensor, an intake pressure sensor, an exhaust temperature sensor, an intake temperature sensor, a first ambient temperature sensor, a temperature and humidity sensor, a condenser coil, a condenser fan, and a second ambient temperature sensor; The outlet end of the condenser coil is connected to the expansion valve, evaporator coil, compressor and high-pressure switch in sequence via a steel pipe, and then connected to the inlet end of the condenser coil. A condenser fan is installed at the condenser coil and an evaporator fan is installed at the evaporator coil, thus forming an air conditioning unit loop. Among them, an exhaust pressure sensor is provided upstream of the expansion valve, an intake temperature sensor and an intake pressure sensor are provided sequentially between the evaporator coil and the compressor, and an exhaust temperature sensor is provided between the compressor and the high-pressure switch. Furthermore, the exhaust pressure sensor, expansion valve, evaporator coil, intake temperature sensor, intake pressure sensor, compressor, exhaust temperature sensor, and high-pressure switch are located inside the wind turbine nacelle, and a temperature and humidity sensor is also installed inside the wind turbine nacelle; the condenser coil is located outside the wind turbine nacelle.

[0028] Preferably, a first charging valve is provided downstream of the condenser coil, and the first charging valve is located outside the wind turbine nacelle; a second charging valve is also provided between the evaporator coil and the suction temperature sensor.

[0029] Example 2 Based on Example 1, this example discloses a control method for an air conditioning control system, the control method comprising the following steps.

[0030] Step S1: After receiving the power-on command, the air conditioning control system executes the hardware power-on and self-test process, and determines whether it meets the power-on standards. This ensures that core components such as sensors and actuators are functioning properly.

[0031] Preferably, step S1 includes: Step S11: Self-test of the air conditioning control system, including: temperature sensor self-test and actuator self-test.

[0032] Taking NTC thermistors as an example, the resistance of NTC thermistors changes with temperature according to the Steinhart-Hart equation. In engineering, the calculation is simplified through piecewise linearization and reference point calibration. Zero offset calibration: ambient temperature At 25℃, record the sensor output reference voltage. =2.5V (stored in EEPROM).

[0033] Sensitivity calibration: Temperature change ΔT = 1℃ corresponds to voltage change S = 0.01V / ℃ (fitted from the B-value characteristic curve of NTC).

[0034] Real-time temperature calculation (after A / D conversion, reference voltage) =5V, AD precision 12bit): =The digital value read by the ADC module (e.g., this value is 4095) .

[0035] Actuator self-test includes: Compressor: Monitoring current at startup ,like > (e.g., rated current 10A, overload threshold 12A) triggers "compressor overcurrent alarm".

[0036] Indoor / Outdoor Fan: Detects motor winding resistance. If the resistance value exceeds the nominal range (e.g., infinite resistance due to open circuit), triggers a "fan fault alarm".

[0037] Step S12: Configure the air conditioning control system parameters, including: basic parameter configuration and PID parameter tuning.

[0038] The main controller collects data from temperature sensors, pressure sensors, pressure switches, electronic expansion valves, and temperature and humidity sensors in the system loop in real time. The data is then processed by analog-to-digital conversion using an STM32F103 chip and uploaded to the HMI for display. The following are specific examples of the configuration and parameter acquisition methods.

[0039] Operators or the automatic configuration module set the core parameters and tuned the PID parameters using the Ziegler-Nichols critical proportional gain method to balance system response speed and stability. The configuration method is as follows: Basic parameter configuration: Target temperature (e.g., 25℃); Temperature Hysteresis (e.g., 1℃, to avoid frequent start-ups and shutdowns of the equipment); Equipment physical constraints: compressor frequency [ =[20Hz, 120Hz], In-cabin fan speed[ =[500rpm, 3000rpm], PID output range [0, = [0%, 100%].

[0040] PID parameter tuning (Ziegler-Nichols method) 1. Order =0, =0, gradually increase the proportional gain Until the system output oscillates with constant amplitude, record the critical proportional gain. and oscillation period .

[0041] 2. Calculate PID parameters: =0.6 , = , = (Note: The refrigeration system has a large inertia and needs to be reduced.) To prevent overshoot, fine-tuning is necessary based on actual on-site operating conditions. Step S13: The main controller determines whether there is an alarm that does not meet the startup requirements based on the returned sensor data. If there is no corresponding alarm, proceed to step S2; otherwise, return to step S11.

[0042] Fault diagnosis formula: Compressor overcurrent: > (like =12A); Overheating inside the cabin: > (like =35℃); Sensor malfunction: Three consecutive temperature jump values ​​|Tin(k) sampled. Tin(k 1) |>5℃.

[0043] Alarm Response Procedure 1. Perform "Clear Alarm Items": Investigate and resolve faults (such as resetting the compressor contactor or replacing the sensor).

[0044] 2. "Alarm Upload": Upload fault codes (such as 0x01=compressor overcurrent, 0x02=cabin overtemperature) via ModbusRTU communication protocol.

[0045] 3. The process jumps back to "Power On" and restarts the initialization process (to ensure safe startup after troubleshooting).

[0046] Preferably, the system parameters need to be pre-configured. Example parameters are as follows (actual parameters can be adjusted according to the application scenario): Target temperature: 25°C for industrial cabins; Temperature hysteresis: ±1℃ (i.e., 24℃~26℃ is the stable range); Minimum compressor frequency: 30Hz (to avoid starting overload while meeting basic cooling requirements); External fan speed at industrial frequency: 1200 r / min (rated speed); Minimum speed of the in-cabin air supply fan: 400 r / min (20% of the rated speed); PID parameters: proportional coefficient =0.8, integral coefficient =0.2, differential coefficient =0.1 (needs to be adjusted experimentally).

[0047] Preferably, the fault handling process (taking "compressor overload alarm" as an example): The system detected that the compressor current exceeded the rated value by 120%, triggering the "Check if the system should alarm → Yes" function. Perform "Clear Alarm Items": Disconnect the compressor power supply, restart after a 5-second delay; if restart fails, mark fault code "E01 (Compressor Overload)"; Execute "Alarm Upload": Send "Compressor overload, fault code E01" to the monitoring platform; After a successful restart, return to the "Set System Parameters" section and restart the system. If the restart fails, the system enters the "Device Standby" state, retaining only the alarm upload and parameter setting functions.

[0048] Step S2: When the start-up criteria of the air conditioning control system are met, the main controller determines the difference between the set target temperature and the cabin temperature and adjusts the cooling accordingly.

[0049] Preferably, step S2 includes: after the system starts, determining the equipment start-up and shutdown conditions through digital filtering and temperature difference calculation, so as to balance energy consumption and temperature control accuracy; The digital filter employs a moving average with a window size of N=5 to suppress temperature fluctuation interference and improve control stability. : ,in This indicates the temperature inside the cabin.

[0050] Step S3: If the temperature inside the cabin is lower than the hysteresis value of the target temperature, the fan stops running, the compressor enters the hot standby state, and the equipment is in standby mode.

[0051] Preferably, step S3 includes: Shutdown conditions:

[0052] When the shutdown condition is met, the fan stops running, the compressor goes into hot standby, and all equipment in the system goes into standby mode; if the shutdown condition is not met, the temperature difference is identified, and multi-module coordinated adjustment is initiated. Multi-module coordinated adjustment specifically includes: compressor frequency adjustment, outdoor air fan adjustment (i.e., condenser fan), and indoor air supply fan adjustment (i.e., evaporator fan).

[0053] Preferably, the compressor frequency regulation (core refrigeration unit) includes: PID Discrete Formula (Positional Form, Suitable for Engineering Implementation): ) in, (Refrigeration scenario).

[0054] Integral anti-saturation treatment: like ,but The excess will be accumulated into the next integration (to prevent the PID output from exceeding the limit and causing equipment overload).

[0055] Compressor frequency mapping:

[0056] Hardware driver: The frequency converter receives frequency commands (4~20mA analog signal or Modbus RTU communication) to control the compressor motor speed.

[0057] Preferably, the adjustment of the cabin air blower includes: Power frequency start-up logic: The relay is activated, and the fan runs at the rated frequency (e.g., 50Hz) to enhance the heat exchange efficiency of the outdoor condenser / evaporator.

[0058] Preferably, the cabin air supply fan is regulated (airflow circulation): PID speed control: The formula is the same as that for compressors, and the output is mapped to the fan drive voltage (PWM duty cycle). .

[0059] In-cabin fan control logic: Control principle: Through linear control, the percentage of wind speed corresponding to the difference between the cabin temperature and the target temperature is

[100] -

[30] .

[0060] Calculation formula: Target speed = ([Indoor temperature] - [Stop temperature]) / ([Target temperature] - [Stop temperature]) * Maximum fan speed.

[0061] Limitation judgment: If the speed is less than the minimum speed, it runs at the minimum speed; if the speed is greater than the maximum speed, it runs at the maximum speed.

[0062] Adjustment process: When the cabin temperature is greater than the upper return difference of the target temperature, the fan starts; when the cabin temperature is less than the lower return difference of the target temperature, and the cabin temperature is stable less than the lower return difference of the target temperature for 10 seconds, the fan stops.

[0063] Fan PID speed control (matching temperature uniformity): By supply air temperature For the goal but: Calculate the deviation

[0064] After executing the PID, it is mapped to the motor speed: .

[0065] For example: When = 30%, =500+0.3×(3000 500) = 1550rpm.

[0066] Fixed speed mode, such as the default minimum speed (e.g., 800 rpm), only provides basic airflow circulation.

[0067] Preferably, the module collaborative control logic (taking "cabin interior temperature higher than 26°C" as an example): The temperature acquisition module detected that the internal temperature was higher than 26.5℃ and calculated the temperature difference. 26.5-25=1.5℃>1℃ (hysteresis value), triggering the "cooling branch"; The outdoor ventilation fan is switched to industrial frequency operation (1200r / min) to quickly exhaust high-temperature air; The compressor starts from standby mode, the frequency jumps to **30Hz** (lowest frequency), and begins cooling; The cabin air supply fan is switched to the lowest speed (400r / min) to assist in the circulation of cold air; PID controller =1.5℃ as input, calculate the compressor frequency increment (e.g. × × ), increasing the compressor frequency to 45Hz; Continuously monitor the cabin temperature; if the temperature drops to 25.5℃ ( =0.5℃), the PID output decreases, and the compressor frequency returns to 35Hz; When the temperature converges to 25±1℃, the external fan maintains its operating frequency, the supply fan maintains its minimum speed, and the compressor maintains its 30Hz operation until the next temperature fluctuation.

[0068] Step S4: If the temperature inside the cabin is higher than the target temperature by a certain hysteresis value, the main controller identifies the magnitude of the temperature difference between the inside and outside of the cabin, starts the external industrial frequency cooling fan, and simultaneously starts the compressor and the internal variable frequency fan, initially starting and running at the lowest frequency.

[0069] Detailed operation steps: After PID adjustment, the shutdown conditions are determined again, forming a closed-loop negative feedback of "adjustment → determination → readjustment" to ensure that the temperature remains stable within the target range.

[0070] like If the condition is met, the process will jump to "Fan Stop" → "Compressor Hot Standby" → "Equipment Standby"; otherwise, it will jump back to "Identify Temperature Difference" and repeat the PID calculation and equipment adjustment.

[0071] Step S5: The cabin temperature sensor provides real-time temperature feedback. The main controller determines whether the current cabin temperature is lower than the target temperature hysteresis value. If it is lower than the target temperature hysteresis value, it returns to step S3; otherwise, it returns to step S4.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An air conditioning control system for a wind turbine nacelle, characterized in that, The air conditioning control system includes: a main controller, an air conditioning unit, and a human-machine interface unit, used for temperature regulation of the wind turbine nacelle; The main controller is configured to control the air conditioning unit based on the sensor data collected by each sensor in the air conditioning unit loop; The human-machine interaction unit is connected to the main controller and is used to complete the interaction between sensor data and control data.

2. The air conditioning control system for wind turbine nacelles as described in claim 1, characterized in that, The air conditioning unit includes: a compressor, an evaporator coil, an evaporator fan, an exhaust pressure sensor, an intake pressure sensor, an exhaust temperature sensor, an intake temperature sensor, a first ambient temperature sensor, a temperature and humidity sensor, a condenser coil, a condenser fan, and a second ambient temperature sensor; The outlet end of the condenser coil is connected to the expansion valve, evaporator coil, compressor and high-pressure switch in sequence via a steel pipe, and then connected to the inlet end of the condenser coil. A condenser fan is installed at the condenser coil and an evaporator fan is installed at the evaporator coil, thus forming an air conditioning unit loop. Among them, an exhaust pressure sensor is provided upstream of the expansion valve, an intake temperature sensor and an intake pressure sensor are provided sequentially between the evaporator coil and the compressor, and an exhaust temperature sensor is provided between the compressor and the high-pressure switch. Furthermore, the exhaust pressure sensor, expansion valve, evaporator coil, intake temperature sensor, intake pressure sensor, compressor, exhaust temperature sensor, and high-pressure switch are located inside the wind turbine nacelle, and a temperature and humidity sensor is also installed inside the wind turbine nacelle; the condenser coil is located outside the wind turbine nacelle.

3. The air conditioning control system for wind turbine nacelles as described in claim 2, characterized in that, A first charging valve is also provided downstream of the condenser coil, and the first charging valve is located outside the wind turbine nacelle; a second charging valve is also provided between the evaporator coil and the suction temperature sensor.

4. A control method for an air conditioning control system as described in any one of claims 1 to 3, characterized in that, The control method includes: S1: After receiving the power-on command, the air conditioning control system executes the hardware power-on and self-test process and determines whether it meets the power-on standards. S2: When the air conditioning control system starts up according to the standard, the main controller determines the difference between the set target temperature and the cabin temperature and adjusts the cooling accordingly. S3: If the temperature inside the cabin is lower than the target temperature by the hysteresis value, the fan will stop running, the compressor will enter the hot standby state, and the equipment will be in standby mode. S4: If the temperature inside the cabin is higher than the target temperature, the main controller identifies the temperature difference between the inside and outside of the cabin, starts the external industrial frequency cooling fan, and simultaneously starts the compressor and the internal variable frequency fan, starting operation at the lowest frequency first. S5: The cabin temperature sensor provides real-time temperature feedback. The main controller determines whether the current cabin temperature is lower than the target temperature hysteresis value. If it is lower than the target temperature hysteresis value, it returns to step S3; otherwise, it returns to step S4.

5. The control method of the air conditioning control system as described in claim 4, characterized in that, Step S1 includes: S11: Air conditioning control system self-test, including: temperature sensor self-test and actuator self-test; S12: Air conditioning control system parameter configuration, including: basic parameter configuration and PID parameter tuning; S13: The main controller determines whether there is an alarm that does not meet the startup requirements based on the returned sensor data. If there is no corresponding alarm, proceed to step S2; otherwise, return to S11.

6. The control method of the air conditioning control system as described in claim 4, characterized in that, Step S12 includes: Basic parameter configuration: Set target temperature Temperature hysteresis Compressor frequency =[20Hz, 120Hz], In-cabin fan speed[ =[500rpm, 3000rpm], PID output range [0, ] = [0%, 100%]; PID parameter tuning: make =0, =0, gradually increase the proportional gain Until the air conditioning control system outputs a constant amplitude oscillation, the critical proportional gain is recorded. and oscillation period ; Calculate PID parameters: =0.6 , = , = 。 7. The control method of the air conditioning control system as described in claim 6, characterized in that, Step S13 includes: Fault detection settings: Compressor overcurrent: > ,in This is the default value; Overheating inside the cabin: > ,in This is the default value; Sensor malfunction: Three consecutive temperature jump values ​​|Tin(k) sampled. Tin(k 1) |>5℃; Alarm Response: Perform alarm clearance to troubleshoot and resolve the fault; Alarm upload: Upload fault codes via Modbus RTU communication protocol, including: 0x01 for compressor overcurrent, 0x02 for cabin overtemperature.

8. The control method of the air conditioning control system as described in claim 7, characterized in that, Step S2 includes: After the system starts up, the start-up and shutdown conditions of the equipment are determined by digital filtering and temperature difference calculation in order to balance energy consumption and temperature control accuracy. The digital filter employs a moving average with a window size of N=5 to suppress temperature fluctuation interference and improve control stability. : ,in This indicates the temperature inside the cabin.

9. The control method of the air conditioning control system as described in claim 8, characterized in that, Step S3 includes: Shutdown conditions: When the shutdown condition is met, the fan stops running, the compressor goes into hot standby, and all equipment in the system goes into standby mode; if the shutdown condition is not met, the temperature difference is identified, and multi-module coordinated adjustment is initiated. Multi-module coordinated adjustment, specifically including: compressor frequency adjustment, cabin outside air fan adjustment, and cabin inside air fan adjustment.

10. The control method of the air conditioning control system as described in claim 9, characterized in that, Compressor frequency regulation includes: PID Discrete Formula: in ; Integral anti-saturation treatment: like ,but The excess will be accumulated into the next integration to prevent the PID output from exceeding the limit and causing equipment overload; Compressor frequency mapping: Hardware driver: The frequency converter receives frequency commands to control the compressor motor speed; The adjustment process of the cabin air supply fan includes: Fan PID speed control: By supply air temperature For the goal but: Calculate the deviation After executing the PID, it is mapped to the motor speed: 。

Images