Automatic on-off control method for box-type substation power supply

Abstract

The invention provides an automatic switch control method for a box transformer power supply, which relates to the technical field of power systems and comprises the following steps: acquiring voltage, current and environmental parameters of the box transformer power supply in real time and transmitting the voltage, current and environmental parameters to front-end processing equipment; calculating input power, output power and power difference; preprocessing the data and calculating voltage and current volatility; establishing a control decision model, and substituting the data to obtain a switch control decision value; the decision value is compared with a preset threshold value, and the switch is automatically controlled to be switched off or switched on; the switch can be monitored in real time and accurately controlled, potential safety hazards can be found in time, and equipment damage and electric power accidents are avoided; the running state is judged by integrating multiple factors, and the system stability is improved; switches are reasonably controlled, and the energy utilization efficiency is improved; environmental factors are considered, complex working environments are adapted, and the maintenance cost and the fault occurrence rate are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to an automatic switch control method for a box-type transformer power supply. Background Art

[0002] With the continuous development of power systems, the safe and stable operation of box-type transformers, as important equipment for power transmission and distribution, is of vital importance. In the operation of box-type transformers, the automatic control of switches is the key link to ensure the normal operation of the system. In recent years, the research on automatic control technology of box-type transformer switches in the field of power systems has been continuously deepened. The traditional switch control method is mainly based on simple threshold judgment, which controls the opening or closing of switches according to fixed thresholds of parameters such as voltage and current. Although this method is simple and easy to implement, it has some limitations.

[0003] As power loads become increasingly complex and diverse, box-type transformers face more challenges. For example, sudden changes in loads, the impact of environmental factors, and equipment aging can all lead to unstable operation or even failure of box-type transformers. Traditional switch control methods often fail to respond promptly and accurately to these problems, which may lead to equipment damage, reduced power quality, and other problems.

[0004] In addition, the monitoring parameters of the box-type transformer power supply in the existing technology are not comprehensive enough, and often only focus on basic parameters such as voltage and current, while ignoring the impact of environmental factors on system operation; at the same time, the control algorithm in the existing technology is relatively simple and cannot adapt well to the dynamic changes of the system, resulting in inaccurate and timely switching actions. Summary of the invention

[0005] The present invention provides a switch automatic control method for a box-type transformer power supply, which can more accurately monitor the operating state of the box-type transformer power supply, make reasonable switch control decisions in time, and improve the operating stability and reliability of the box-type transformer power supply.

[0006] The present invention provides a switch automatic control method for a box-type transformer power supply, comprising:

[0007] Step 1: collect the input voltage, output voltage, input current, output current and environmental parameters of the current box-type transformer power supply in real time, and transmit them to the front-end processing equipment;

[0008] Step 2: Calculate the input power, output power and power difference of the current box-type transformer power supply through the front-end processing device;

[0009] Step 3, the front-end processing device pre-processes the collected data and calculates the voltage fluctuation rate and current fluctuation rate of the current box-type transformer power supply;

[0010] Step 4: pre-establish a control decision model, substitute various data obtained after calculation by the front-end processing device into the model for operation, and obtain a switch control decision value;

[0011] Step five: compare the current switch control decision value with the preset threshold value, and based on the comparison result, automatically control the opening or closing of the power switch of the box transformer.

[0012] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, in step 1, the environmental parameters include temperature parameters and humidity parameters at the box-type transformer power supply.

[0013] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, in step 2, the calculation formula for calculating the input power, output power and power difference of the current box-type transformer power supply by the front-end processing device includes:

[0014] P in =V in *I in

[0015] P out =V out *I out

[0016] ΔP=P in -P out

[0017] Among them, V in is the box-type transformer input voltage, V out is the output voltage of the box-type transformer, I in is the input current of the box-type transformer, I out P is the output current of the box transformer; in is the box-type transformer input power, P out is the output power of the box-type transformer, ΔP is the power difference;

[0018] Transformer input power P in Used to reflect the energy supply rate on the input side of the box-type transformer power supply;

[0019] Box transformer output power P out Used to reflect the energy rate provided by the box-type transformer to the load;

[0020] The power difference ΔP is used to reflect the balance inside the box-type transformer power supply.

[0021] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, in step three, the process of preprocessing the collected data by the front-end processing device includes:

[0022] The input voltage V of the current box-type transformer power supply is collected in , output voltage Vout 、Input current I in , output current I out Group by voltage and current;

[0023] Determine the maximum and minimum values ​​of the input voltage and the output voltage, and the maximum and minimum values ​​of the input current and the output current.

[0024] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, in step three, the calculation formula for calculating the voltage fluctuation rate and current fluctuation rate of the current box-type transformer power supply includes:

[0025]

[0026] Among them, V flu is the voltage fluctuation rate, max(V in , V out ) is the input voltage V in and output voltage V out The maximum value, min(V in , V out ) is the input voltage V in and output voltage V out The minimum value in ; Represents the average of input and output voltages, used to relativize voltage fluctuations; voltage fluctuation rate V flu A dimensionless quantity used to reflect the relative fluctuation of voltage over a period of time;

[0027]

[0028] Among them, I flu is the current fluctuation rate, max(I in , I out ) is the input current I in and output current I out The maximum value in min(I in , I out ) is the input current I in and output current I out The minimum value in ; Represents the average value of input and output current, used to relativize current fluctuations; current fluctuation rate I flu A dimensionless quantity used to reflect the relative fluctuation of current over a period of time.

[0029] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, in step 4, the pre-established control decision model is:

[0030]

[0031] Among them, S dec is the switch control decision value, T en is the ambient temperature parameter, U en is the environmental humidity parameter; Represents the contribution of power difference and environmental factors to the switch control decision; represents the effect of voltage differences on switch control decisions; Represents the impact of current difference on switch control decision; α and β are adjustable coefficients used to balance the impact of voltage fluctuation rate and current fluctuation rate in the decision value;

[0032] Substitute the parameters of the current box-type transformer power supply into the control decision model, and calculate the switch control decision value S of the current box-type transformer power supply. dec .

[0033] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, the process of comparing the current switch control decision value with a preset threshold value and automatically controlling the opening or closing of the box-type transformer power supply switch based on the comparison result includes:

[0034] Preset the initial threshold D0 and adjustment period T;

[0035] After each adjustment cycle T, the threshold is updated through the threshold adjustment model to generate the current threshold D new ;

[0036] Set the current switch control decision value S dec With the current threshold D av Make comparisons;

[0037] When the comparison result is S dec ≥D av When , a disconnection instruction is generated;

[0038] When the comparison result is S dec <D av When , a connection or maintenance instruction is generated;

[0039] The generated command is sent to the controller, and the controller controls the opening or closing action of the box-type transformer power switch based on the type of the command.

[0040] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, the threshold adjustment model is:

[0041]

[0042] Among them, D new is the current threshold, D0 is the initial threshold; δ is the amplitude modulation coefficient, which is used to control the adjustment amplitude of the threshold; S avgis the historical switch control decision value S within a period T dec The average value, S std is the historical switch control decision value S within a period T dec The standard deviation of .

[0043] According to a switch automatic control method for a box-type transformer power supply provided by the present invention, the controller adopts a PID controller.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. Through real-time monitoring and precise control of switches, potential safety hazards can be discovered and dealt with in a timely manner, avoiding equipment damage and power accidents caused by faults;

[0046] 2. Comprehensively consider multiple factors such as voltage, current, power difference, environmental parameters, etc., and be able to more accurately judge the operating status of the box-type transformer power supply, so as to take corresponding control measures and improve the stability of the system;

[0047] 3. According to the actual operation of the box-type transformer power supply, reasonably control the opening and closing of the switch to avoid energy waste and improve energy utilization efficiency;

[0048] 4. Taking into account the influence of factors such as ambient temperature and humidity, it can maintain good control effects under different environmental conditions and adapt to complex working environments;

[0049] 5. Intelligent switch control can reduce equipment damage and failure rate, thereby reducing maintenance costs and maintenance workload;

[0050] 6. Accurate and timely switch control can ensure the stable operation of the power system, improve the reliability of the power system, and provide users with better power services.

[0051] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0052] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0054] Figure 1The present invention is a flowchart of a method for automatically controlling switches of a box-type transformer power supply provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0056] Embodiment 1:

[0057] This embodiment provides a switch automatic control method for a box-type transformer power supply. Figure 1 ,include:

[0058] Step 1: collect the input voltage, output voltage, input current, output current and environmental parameters of the current box-type transformer power supply in real time, and transmit them to the front-end processing equipment;

[0059] Step 2: Calculate the input power, output power and power difference of the current box-type transformer power supply through the front-end processing device;

[0060] Step 3, the front-end processing device pre-processes the collected data and calculates the voltage fluctuation rate and current fluctuation rate of the current box-type transformer power supply;

[0061] Step 4: pre-establish a control decision model, substitute various data obtained after calculation by the front-end processing device into the model for operation, and obtain a switch control decision value;

[0062] Step five: compare the current switch control decision value with the preset threshold value, and based on the comparison result, automatically control the opening or closing of the power switch of the box transformer.

[0063] The principle of the above embodiment is: by real-time collection of various parameters and environmental parameters of the box-type transformer power supply, calculating the input power, output power and power difference, pre-processing data and calculating the voltage fluctuation rate and current fluctuation rate, substituting these data into a pre-established control decision model to obtain a switch control decision value, and finally comparing the decision value with a preset threshold value, thereby automatically controlling the opening or closing of the box-type transformer power supply switch; this method comprehensively considers the influence of multiple factors on the operating status of the box-type transformer power supply, and can achieve more accurate and reliable switch control.

[0064] The beneficial effects of the above embodiments are: improving the accuracy and reliability of the switch control of the box-type transformer power supply, being able to respond to changes in the operating status of the box-type transformer power supply in a timely manner, and avoiding equipment damage and power failures caused by untimely or inaccurate switch action; taking into account factors such as voltage fluctuation rate and current fluctuation rate, being able to better cope with voltage and current fluctuations, and improving the stability of the box-type transformer power supply system; incorporating environmental parameters so that the switch control can be adjusted according to environmental changes, and enhancing the adaptability of the box-type transformer power supply in different environments; through precise control decision models, being able to optimize the operating efficiency of the box-type transformer power supply and reduce energy waste; realizing automatic control of the box-type transformer power supply switch, reducing manual intervention, and improving the automation level of the power system.

[0065] In order to further optimize the above embodiment, in step 1, the environmental parameters include temperature parameters and humidity parameters at the box-type transformer power supply.

[0066] It should be noted that the temperature and humidity parameters at the box-type transformer power supply have an important impact on the operating status of the box-type transformer. Too high or too low temperature will affect the performance and life of the equipment, and high humidity will cause problems such as moisture and short circuits. Therefore, incorporating temperature and humidity parameters into environmental parameters for monitoring can provide a more comprehensive understanding of the operating environment of the box-type transformer and provide a more accurate basis for subsequent control decisions. By monitoring temperature and humidity parameters in real time, when environmental conditions change, the switch control strategy can be adjusted in time to ensure that the box-type transformer operates under suitable environmental conditions and improve the reliability and stability of the box-type transformer.

[0067] In order to further optimize the above embodiment, in step 2, the calculation formula for calculating the input power, output power and power difference of the current box-type transformer power supply by the front-end processing device includes:

[0068] P in =V in *I in

[0069] P out =V out *I out

[0070] ΔP=P in -P out

[0071] Among them, V in is the box-type transformer input voltage, V out is the output voltage of the box-type transformer, I in is the input current of the box-type transformer, I out P is the output current of the box transformer; in is the box-type transformer input power, P out is the output power of the box-type transformer, ΔP is the power difference;

[0072] Transformer input power P in Used to reflect the energy supply rate on the input side of the box-type transformer power supply;

[0073] Box transformer output power P out Used to reflect the energy rate provided by the box-type transformer to the load;

[0074] The power difference ΔP is used to reflect the balance inside the box-type transformer power supply.

[0075] It should be noted that these calculation formulas are based on basic electrical principles. By accurately calculating the input power, output power and power difference, you can intuitively understand the energy transmission of the box-type transformer power supply. The calculation of the power difference can reflect the energy balance state inside the box-type transformer. When the power difference is too large, it may mean that the box-type transformer has a fault or abnormality, which needs to be handled in time. At the same time, the accurate calculation of these parameters is also an important basis for subsequent switch control decisions.

[0076] In order to further optimize the above embodiment, in step three, the process of preprocessing the collected data by the front-end processing device includes:

[0077] The input voltage V of the current box-type transformer power supply is collected in , output voltage V out 、Input current I in , output current I out Group by voltage and current;

[0078] Determine the maximum and minimum values ​​of the input voltage and the output voltage, and the maximum and minimum values ​​of the input current and the output current.

[0079] It should be noted that the purpose of preprocessing the collected data is to better analyze the operating status of the box-type transformer power supply. By grouping according to voltage and current, we can have a clearer understanding of the changes in voltage and current. Determining the maximum and minimum values ​​of the input voltage and output voltage, as well as the maximum and minimum values ​​of the input current and output current, can help us evaluate the fluctuation range of voltage and current, and then judge the stability of the box-type transformer power supply. These preprocessing steps provide the basis for the subsequent calculation of voltage fluctuation rate and current fluctuation rate, which can more accurately evaluate the operating status of the box-type transformer power supply, thereby making more reasonable switch control decisions.

[0080] In order to further optimize the above embodiment, in step three, the calculation formula for calculating the voltage fluctuation rate and current fluctuation rate of the current box-type transformer power supply includes:

[0081]

[0082] Among them, V fluis the voltage fluctuation rate, max(V in , V out ) is the input voltage V in and output voltage V out The maximum value, min(V in , V out ) is the input voltage V in and output voltage V out The minimum value in ; Represents the average of input and output voltages, used to relativize voltage fluctuations; voltage fluctuation rate V flt A dimensionless quantity used to reflect the relative fluctuation of voltage over a period of time;

[0083]

[0084] Among them, I flu is the current fluctuation rate, max(I in , I out ) is the input current I in and output current I out The maximum value in min(I in , I out ) is the input current I in and output current I out The minimum value in ; Represents the average value of input and output current, used to relativize current fluctuations; current fluctuation rate I flu A dimensionless quantity used to reflect the relative fluctuation of current over a period of time.

[0085] It should be noted that the calculation of voltage fluctuation rate and current fluctuation rate can more accurately reflect the stability of voltage and current of the box-type transformer during operation. By calculating the ratio of the difference between the maximum value and the minimum value to the mean value, the degree of voltage and current fluctuation can be quantified. The voltage fluctuation rate is used to reflect the relative degree of voltage fluctuation over a period of time, and the current fluctuation rate is used to reflect the relative fluctuation of current over a period of time. The calculation of these fluctuation rates is very important for evaluating the operating quality and stability of the box-type transformer. When the voltage or current fluctuation rate is large, it may indicate that there are potential problems with the box-type transformer, which requires further attention and processing. Therefore, incorporating the voltage fluctuation rate and current fluctuation rate into the considerations of the switch control decision can improve the accuracy and reliability of the switch control and better protect the safe and stable operation of the box-type transformer and related equipment.

[0086] In order to further optimize the above embodiment, in step 4, the pre-established control decision model is:

[0087]

[0088] Among them, S dec is the switch control decision value, T en is the ambient temperature parameter, U en is the environmental humidity parameter; Represents the contribution of power difference and environmental factors to the switch control decision; represents the effect of voltage differences on switch control decisions; Represents the impact of current difference on switch control decision; α and β are adjustable coefficients used to balance the impact of voltage fluctuation rate and current fluctuation rate in the decision value;

[0089] Substitute the parameters of the current box-type transformer power supply into the control decision model, and calculate the switch control decision value S of the current box-type transformer power supply. dec .

[0090] It should be noted that the control decision model comprehensively considers the impact of multiple factors on the switch control of the box-type transformer power supply. The square root of the product of the power difference and the environmental factor divided by the sum of the input and output power reflects the comprehensive contribution of the power difference and the environmental factor to the switch control decision. The ratio of the voltage difference to the sum of the input and output voltages reflects the important impact of the voltage difference on the switch control. The ratio of the current difference to the sum of the input and output currents also plays a key role in the switch control decision. α and β, as adjustable coefficients, can flexibly balance the weights of the voltage fluctuation rate and the current fluctuation rate in the decision value according to the actual situation, so that the switch control can more accurately adapt to different operating scenarios;

[0091] By substituting the current parameters of the box-type transformer into the model for calculation, a switch control decision value that fully reflects the operating status of the box-type transformer can be obtained. This decision value can provide an accurate basis for subsequent switch control, ensuring that the box-type transformer operates in a safe and stable state, while improving energy efficiency and system reliability.

[0092] In order to further optimize the above embodiment, the process of comparing the current switch control decision value with the preset threshold value and automatically controlling the opening or closing of the box transformer power switch based on the comparison result includes:

[0093] Preset the initial threshold D0 and adjustment period T;

[0094] After each adjustment cycle T, the threshold is updated through the threshold adjustment model to generate the current threshold D new ;

[0095] Set the current switch control decision value S dec With the current threshold D av Make comparisons;

[0096] When the comparison result is S dec ≥Dav When , a disconnection instruction is generated;

[0097] When the comparison result is S dec <D av When , a connection or maintenance instruction is generated;

[0098] The generated command is sent to the controller, and the controller controls the opening or closing action of the box-type transformer power switch based on the type of the command.

[0099] Wherein, the threshold adjustment model is:

[0100]

[0101] Among them, D new is the current threshold, D0 is the initial threshold; δ is the amplitude modulation coefficient, which is used to control the adjustment amplitude of the threshold; S avg is the historical switch control decision value S within a period T dec The average value, S std is the historical switch control decision value S within a period T dec The standard deviation of .

[0102] It should be noted that by presetting the initial threshold and adjustment cycle and dynamically updating the threshold using the threshold adjustment model, the switch control can be made more flexible and adaptable to the actual operation. After each adjustment cycle, the threshold is adjusted according to the average value and standard deviation of the historical switch control decision value, which can better reflect the change trend of the system.

[0103] When the current switch control decision value is greater than or equal to the current threshold, a disconnection instruction is generated, indicating that the box-type transformer power supply may be in an abnormal state and the switch needs to be disconnected to protect the equipment and load. When the current switch control decision value is less than the current threshold, a connection or maintenance instruction is generated, indicating that the box-type transformer power supply is operating normally and can maintain the current connection state or continue to operate.

[0104] After sending the command to the controller, the controller can accurately execute the corresponding action and realize precise control of the box-type transformer power switch. This method can improve the reliability and stability of the system, reduce misoperation and unnecessary switching actions, and better cope with various changes in system operation.

[0105] In addition, the setting of the amplitude modulation coefficient δ needs to be adjusted according to the actual situation to balance the sensitivity and stability of the threshold adjustment. Too large a δ may cause the threshold to fluctuate frequently, while too small a δ may make the system respond to changes in an untimely manner. Therefore, a reasonable setting of the value of δ is of great significance for optimizing switch control and should be set based on actual conditions or experience.

[0106] In order to further optimize the above embodiment, the controller adopts a PID controller.

[0107] It should be noted that accurate control of the system is achieved by performing proportional, integral and differential operations on the error signal. In this embodiment, a PID controller can quickly and accurately generate corresponding control instructions based on the comparison result between the current switch control decision value and the threshold, thereby achieving rapid and stable control of the box-type transformer power switch.

[0108] Specifically, the proportional part of the PID controller can quickly adjust the control output according to the size of the error, allowing the system to respond quickly to changes; the integral part can eliminate the steady-state error of the system and improve control accuracy; the differential part can predict the changing trend of the error and make adjustments in advance, thereby reducing system oscillation and overshoot.

[0109] By adopting the PID controller, the response speed, stability and accuracy of the box-type transformer power switch control can be improved, the system performance can be further optimized, and the safe and reliable operation of the box-type transformer power can be ensured.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A switch automatic control method for a box-type transformer power supply, characterized in that: The following steps are involved: Step 1: collect the input voltage, output voltage, input current, output current and environmental parameters of the current box-type transformer power supply in real time, and transmit them to the front-end processing equipment; Step 2: Calculate the input power, output power and power difference of the current box-type transformer power supply through the front-end processing device; Step 3, the front-end processing device pre-processes the collected data and calculates the voltage fluctuation rate and current fluctuation rate of the current box-type transformer power supply; Step 4: pre-establish a control decision model, substitute various data obtained after calculation by the front-end processing device into the model for operation, and obtain a switch control decision value; Step five: compare the current switch control decision value with the preset threshold value, and based on the comparison result, automatically control the opening or closing of the power switch of the box transformer.

2. A switch automatic control method for a box-type transformer power supply according to claim 1, characterized in that: In step one, the environmental parameters include temperature parameters and humidity parameters at the box-type transformer power supply.

3. A switch automatic control method for a box-type transformer power supply according to claim 2, characterized in that: In step 2, the front-end processing device calculates the input power, output power and power difference of the current box-type transformer power supply using the calculation formula: include: P in =V in *I in P out =V out *I out ΔP=P in -P out Among them, V in is the box-type transformer input voltage, V out is the output voltage of the box-type transformer, I in is the input current of the box-type transformer, I out P is the output current of the box transformer; in is the box-type transformer input power, P out is the output power of the box-type transformer, ΔP is the power difference; Box transformer input power P in Used to reflect the energy supply rate on the input side of the box-type transformer power supply; Box transformer output power P out Used to reflect the energy rate provided by the box-type transformer to the load; The power difference ΔP is used to reflect the balance inside the box-type transformer power supply.

4. A switch automatic control method for a box-type transformer power supply according to claim 3, characterized in that: In step three, the process of preprocessing the collected data by the front-end processing device includes: The input voltage V of the current box-type transformer power supply is collected in , output voltage V out 、Input current I in , output current I out Group by voltage and current; Determine the maximum and minimum values ​​of the input voltage and the output voltage, and the maximum and minimum values ​​of the input current and the output current.

5. The switch automatic control method for box-type transformer power supply according to claim 4 is characterized in that: In step three, the calculation formula for calculating the voltage fluctuation rate and current fluctuation rate of the current box-type transformer power supply includes: Among them, V flu is the voltage fluctuation rate, max(V in , V out ) is the input voltage V in and output voltage V out The maximum value, min(V in , V out ) is the input voltage V in and output voltage V out The minimum value in ; Represents the average of input and output voltages, used to relativize voltage fluctuations; voltage fluctuation rate V flu A dimensionless quantity used to reflect the relative fluctuation of voltage over a period of time; Among them, I flu is the current fluctuation rate, max(I in , I out ) is the input current I in and output current I out The maximum value in min(I in , I out ) is the input current I in and output current I out The minimum value in ; Represents the average value of input and output current, used to relativize current fluctuations; current fluctuation rate I flu A dimensionless quantity used to reflect the relative fluctuation of current over a period of time.

6. A switch automatic control method for a box-type transformer power supply according to claim 5, characterized in that: In step 4, the pre-established control decision model is: Among them, S dec is the switch control decision value, T en is the ambient temperature parameter, U en is the environmental humidity parameter; represents the contribution of power difference and environmental factors to the switch control decision; represents the effect of voltage differences on switch control decisions; Represents the impact of current difference on switch control decision; α and β are adjustable coefficients used to balance the impact of voltage fluctuation rate and current fluctuation rate in the decision value; Substitute the parameters of the current box-type transformer power supply into the control decision model, and calculate the switch control decision value S of the current box-type transformer power supply. dec .

7. A switch automatic control method for a box-type transformer power supply according to claim 6, characterized in that: The process of comparing the current switch control decision value with the preset threshold value and automatically controlling the opening or closing of the power switch of the box transformer based on the comparison result includes: Preset the initial threshold D0 and adjustment period T; After each adjustment cycle T, the threshold is updated through the threshold adjustment model to generate the current threshold D new ; Set the current switch control decision value S dec With the current threshold D av Make comparisons; When the comparison result is S dec ≥D av When , a disconnection instruction is generated; When the comparison result is S dec <D av When , a connection or maintenance instruction is generated; The generated command is sent to the controller, and the controller controls the opening or closing action of the box-type transformer power switch based on the type of the command.

8. The switch automatic control method for box-type transformer power supply according to claim 7 is characterized in that: The threshold adjustment model is: Among them, D new is the current threshold, D0 is the initial threshold; δ is the amplitude modulation coefficient, which is used to control the adjustment amplitude of the threshold; S avg is the historical switch control decision value S within a period T dec The average value, S std is the historical switch control decision value S within a period T dec The standard deviation of .

9. The switch automatic control method for box-type transformer power supply according to claim 8 is characterized in that: The controller adopts a PID controller.

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