Environment regulation and control device and method suitable for intelligent control cabinet of transformer substation

Abstract

The invention discloses an environment regulation and control device and method suitable for an intelligent control cabinet of a transformer substation. The environment regulation and control device comprises a controller, a sensing module, a gas transmission tail end regulation and control module, an auxiliary module and a gas source module. The sensing module comprises a temperature and humidity sensor arranged in the intelligent control cabinet; the air source module comprises a precooler, an air inlet buffer device, a compressor, an aftercooler and a drying pressure stabilizing device which are connected in sequence; the gas transmission tail end regulation and control module comprises a regulation valve group and an expansion machine; the auxiliary module comprises auxiliary compressors, and each auxiliary compressor and one expansion machine are coaxially arranged. According to the environment regulation and control device and method suitable for the intelligent control cabinet of the transformer substation, the centralized and reasonable environment regulation and control device is designed for a large number of outdoor intelligent control cabinets in the transformer substation, and the intelligent control cabinet of the transformer substation can be safer and more reliable in combination with a specific regulation and control method; and the intelligent control process of the intelligent control cabinet of the transformer substation is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent substations, and in particular to an environment control device and method suitable for an intelligent control cabinet in a substation. Background Art

[0002] Compared with traditional substations, smart substations have added many smart control cabinets installed on-site next to the primary equipment. The cabinets are equipped with components composed of a collection of electronic devices such as merging units, smart terminals, relay protection devices, measurement and control devices, status monitoring devices, process layer switches, analog wiring panels and hard pressure plates. They are organically combined with the primary equipment to form smart devices to realize functions such as information collection, measurement, control, protection, metering and monitoring.

[0003] The working performance of the electronic devices in the intelligent control cabinet is extremely sensitive to changes in factors such as temperature and humidity inside the intelligent control cabinet. For example, inappropriate temperature and humidity can easily shorten the service life of the electronic devices, or even cause the devices to malfunction or refuse to operate. Especially in a humid environment, condensation inside the cabinet can easily cause the insulation capacity of the circuit to decrease and cause a short circuit, resulting in serious consequences such as load shedding and equipment damage, which seriously threatens the stability and safety of the power grid. Therefore, how to effectively monitor and adjust the substation intelligent control cabinet so that the working environment of the substation intelligent control cabinet meets the preset requirements has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The present invention provides an environmental control device and method suitable for a substation intelligent control cabinet, designs a centralized and reasonable environmental control device for a large number of outdoor intelligent control cabinets in a substation, and combines a specific control method to make the substation intelligent control cabinet safer and more reliable, thereby promoting the intelligent control process of the substation intelligent control cabinet.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an environmental control device suitable for a substation intelligent control cabinet, including a controller and a sensing module respectively controlled by the controller, a gas transmission terminal control module arranged outside the intelligent control cabinet, an auxiliary module, and at least one group of gas source modules;

[0006] The sensing module includes a temperature and humidity sensor disposed in each intelligent control cabinet;

[0007] The air source module includes a precooler, an air intake buffer device, a compressor, an aftercooler and a drying and pressure stabilizing device connected in sequence;

[0008] The gas transmission terminal control module includes the same number of regulating valve groups and expanders as the intelligent control cabinet, the input end of each regulating valve group is connected to the output end of the drying and pressure stabilizing device, the output end of each regulating valve group is connected to the input end of the corresponding expander, and the output end of each expander is connected to the air inlet end of the heat exchanger of the corresponding intelligent control cabinet;

[0009] The auxiliary module includes the same number of auxiliary compressors as the expanders, each of the auxiliary compressors is coaxially arranged with a corresponding expander, the input end of each auxiliary compressor is connected to the outlet end of the heat exchanger of the corresponding intelligent control cabinet, and the output end of each auxiliary compressor is connected to the input end of the precooler.

[0010] As one of the preferred solutions, the output end of the drying and pressure-stabilizing device is respectively connected to the input end of each of the regulating valve groups through a gas supply main pipe.

[0011] As one of the preferred solutions, the output end of each auxiliary compressor is connected to the input end of the precooler through an exhaust main pipe.

[0012] Another embodiment of the present invention provides an environmental control method applicable to a substation intelligent control cabinet, which is applied to the environmental control device applicable to the substation intelligent control cabinet as described above. The environmental control method applicable to the substation intelligent control cabinet includes:

[0013] Obtain temperature and humidity data in each intelligent control cabinet in real time;

[0014] Processing the temperature data and the humidity data to obtain a processing and judgment result of an abnormal intelligent control cabinet;

[0015] Generate a corresponding first control instruction to enable the gas source module to input dry air to the corresponding abnormal intelligent control cabinet through the gas transmission terminal control module until the abnormal intelligent control cabinet meets the preset normal environmental conditions.

[0016] As one preferred solution, the normal environmental conditions specifically include:

[0017] During a preset time period, the temperature inside the intelligent control cabinet where the abnormality is detected is within a preset normal temperature range, and the humidity inside the intelligent control cabinet where the abnormality is detected is within a preset normal humidity range.

[0018] As one of the preferred solutions, the environmental control method applicable to the intelligent control cabinet of a substation also includes:

[0019] According to the first control instruction, the corresponding regulating valve group and the electric heating device in the abnormal intelligent control cabinet are controlled to perform matching operations.

[0020] As one of the preferred solutions, the environmental control method applicable to the intelligent control cabinet of a substation also includes:

[0021] Acquire the outlet pressure of each auxiliary compressor in real time;

[0022] When it is detected that the outlet pressure of the auxiliary compressor is less than a preset auxiliary compressor outlet pressure low value, a corresponding second control instruction is generated and sent to the compressor, so that the compressor stops extracting the compressed air inside the air intake buffer device, and the compressed air discharged by the corresponding auxiliary compressor is stored in the air intake buffer device until the outlet pressure of the corresponding auxiliary compressor reaches the auxiliary compressor outlet pressure low value;

[0023] When it is detected that the outlet pressure of the auxiliary compressor is greater than the preset auxiliary compressor outlet pressure high value, a corresponding third control instruction is generated and sent to the compressor, so that the compressor starts to extract the compressed air inside the intake buffer device until the corresponding outlet pressure of the auxiliary compressor reaches the auxiliary compressor outlet pressure high value.

[0024] As one of the preferred solutions, the environmental control method applicable to the intelligent control cabinet of a substation also includes:

[0025] Acquiring the internal pressure of the drying and pressure-stabilizing device in real time;

[0026] When it is detected that the internal pressure of the drying pressure-stabilizing device is greater than the preset pressure value of the drying pressure-stabilizing device, a corresponding fourth control instruction is generated and sent to the drying pressure-stabilizing device to cause the drying pressure-stabilizing device to open the pressure relief valve to reduce its internal pressure until the internal pressure of the drying pressure-stabilizing device is less than or equal to the pressure value of the drying pressure-stabilizing device.

[0027] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0028] (1) By designing centralized environmental control devices for a large number of outdoor intelligent control cabinets in substations, the environmental conditioning devices are made safer, more reliable and more energy-efficient, which promotes the intelligent control process of substation intelligent control cabinets;

[0029] (2) The main equipment such as gas source module, pipeline, regulating valve group, expander, auxiliary compressor, etc. are arranged outside the intelligent control cabinet, which significantly reduces the number of temperature and humidity adjustment equipment inside the intelligent control cabinet, facilitates centralized monitoring and control, and is convenient for maintenance and repair, without shutting down the corresponding intelligent control cabinet and primary equipment;

[0030] (3) Connecting the expander in parallel between the compressed air supply main pipe and each intelligent control cabinet, and using the compressed air's own pressure to expand and cool, can improve the performance coefficient of the refrigeration process and reduce energy consumption;

[0031] (4) Arrange an auxiliary compressor coaxial with the expander to recover the output power of the expander. Perform a first-stage compression on the exhaust gas from the control cabinet in the auxiliary compressor, which can increase the intake pressure of the compressor in the air source module, reduce the compression ratio of the air in the compressor and the compression work consumed, and further reduce the energy consumption of the entire compressed air refrigeration system;

[0032] (5) An intake buffer device is arranged at the compressor inlet to control the start and stop of the compressor according to the outlet pressure of the auxiliary compressor. The compressor can be operated intermittently under low load to maintain the intake pressure and pressure ratio of the main compressor, avoiding the main compressor intake pressure being too low, the pressure ratio, exhaust temperature and compression power consumption being too high when the compressor is running at low load and low flow rate;

[0033] (6) The prior art uses an open environmental control device. When the climate is humid, the compressed air discharged from the compressor needs to be continuously dehumidified by the aftercooler, resulting in a significant increase in energy consumption. In the present invention, the air used as the cooling medium circulates inside the device, and its humidity is basically not affected by the ambient humidity, so the dehumidification load is small and the energy consumption is low;

[0034] (7) The present invention can adopt a high-pressure system to increase the air pressure at the expander outlet and the compressor inlet, reduce the compressor suction specific volume, and reduce the pressure ratio, thereby reducing the size of the pipelines and components of the substation outdoor intelligent control cabinet environmental control device, thereby compensating for the shortcoming of the small unit volume cooling capacity of the air refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural block diagram of an environmental control device applicable to a substation intelligent control cabinet in one embodiment of the present invention;

[0036] Figure 2 It is a flow chart of an environmental control method applicable to a substation intelligent control cabinet in one embodiment of the present invention;

[0037] Reference numerals:

[0038] Among them, 1. Sensing module; 2. Gas transmission terminal control module; 21. Regulating valve group; 22. Expander; 3. Auxiliary module; 31. Auxiliary compressor; 4. Gas source module; 41. Precooler; 42. Intake buffer device; 43. Compressor; 44. Aftercooler; 45. Drying and pressure stabilizing device; 5. Gas supply main pipe; 6. Exhaust main pipe. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0041] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only for illustrative purposes, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0043] It should be noted in advance that the defects of the temperature and humidity adjustment methods currently applicable to intelligent control cabinets are mainly as follows:

[0044] 1. Use natural ventilation or fan forced ventilation, and combine it with an electric heater to let ambient air flow into the cabinet and take away the heat to reduce the temperature inside the cabinet. When the temperature inside the cabinet is low or the humidity is high, increase the temperature inside the cabinet through electric heating, and reduce the relative humidity while keeping the absolute humidity constant. However, in a high temperature and high humidity environment, although the relative humidity is reduced by electric heating, it is easy to cause over-temperature risks due to further temperature rise, and when the cabinet wall temperature drops with the ambient temperature, condensation may still occur on the local wall surface.

[0045] 2. Use semiconductor devices or precision air conditioners for temperature control and dehumidification, use cabinet ventilation to lower the temperature, and use semiconductor condensation to reduce the humidity in the cabinet. When the temperature in the cabinet is low, turn on the electric heater; however, due to the very compact structure of the intelligent control cabinet and extremely limited layout space, usually only one set of temperature control and dehumidification equipment can be arranged in each control cabinet, and redundant backup cannot be achieved. When the temperature control and dehumidification equipment fails, the corresponding intelligent control cabinet and primary equipment must be shut down for maintenance, affecting the operation of the substation. In addition, if the air conditioning refrigerant leaks, it will also cause serious electrical disasters.

[0046] 3. Use a closed cabinet to cool the compressed air output by the air compressor through a semiconductor refrigeration sheet. After obtaining the low-temperature compressed air, it is passed into the control cabinet to reduce the temperature and humidity inside the cabinet. Not only does the air compression process consume electricity, but the semiconductor refrigeration sheet also consumes additional electricity in the process of cooling the compressed air. The performance coefficient of the refrigeration process is low, the energy of the compressed air itself is not fully utilized, and the energy consumption is high.

[0047] 4. Use the compressor to generate compressed air, then convert the compressed air into low-temperature normal-pressure air through the expansion device, pass it into the control cabinet to directly absorb the heat in the cabinet, and then discharge it into the environment. This open system does not recycle the expansion work of compressed air, and continuously inhales ambient air under humid climate conditions, which will increase the dehumidification load and increase system energy consumption.

[0048] 5. Use a closed cabinet and use precision air conditioning to control the temperature inside the cabinet. Semiconductor condensation can also be used to reduce the humidity inside the cabinet. Since there are a large number of outdoor intelligent control cabinets in each substation, the number of temperature control and dehumidification equipment will be huge, which is not conducive to the centralized control and maintenance of the substation.

[0049] An embodiment of the present invention provides an environmental control device suitable for a substation intelligent control cabinet. For details, see Figure 1 , Figure 1 The figure shows a structural block diagram of an environmental control device suitable for a substation intelligent control cabinet in one embodiment of the present invention, which includes a controller (not shown) and a sensing module 1 respectively controlled by the controller, a gas transmission terminal control module 2 arranged outside the intelligent control cabinet, an auxiliary module 3 (only the auxiliary compressor 31 is shown in the figure), and at least one group of gas source modules 4.

[0050] The gas transmission terminal control module 2, the auxiliary module 3 and the gas source module 4 of the embodiment of the present invention are all arranged outside the intelligent control cabinet, which significantly reduces the number of components inside the intelligent control cabinet and facilitates maintenance.

[0051] In addition, the controller in the embodiment of the present invention integrates multiple control functions, and in actual applications may include a temperature controller, a humidity controller and a pressure controller, or it may be an integrated control chip or processor, which is not specifically limited in the embodiment of the present invention and will not be repeated later.

[0052] In the above embodiment, the sensing module 1 includes a temperature and humidity sensor arranged in each intelligent control cabinet, and real-time monitoring of the environmental conditions in the cabinet is achieved through the temperature and humidity sensor arranged in the cabinet. Of course, the model of the temperature and humidity sensor is determined by the actual product cost design requirements and is not specifically limited in the embodiment of the present invention.

[0053] The air source module 4 includes a precooler 41, an air intake buffer device 42, a compressor 43, an aftercooler 44 and a drying and pressure stabilizing device 45 connected in sequence. Figure 1 Only one gas source module 4 and two intelligent control cabinets are shown for example, which does not constitute a quantity limitation for the present invention. In actual design, the number of gas source modules can be adjusted as needed to adapt to different numbers of outdoor intelligent control cabinets, which will not be repeated here.

[0054] The connection relationship of each component in the air source module 4 is as follows: the input end of the precooler 41 is connected to the output end of each auxiliary compressor outside the air source module, the output end of the precooler 41 is connected to the input end of the air intake buffer device 42, the output end of the air intake buffer device 42 is connected to the input end of the compressor 43, the output end of the compressor 43 is connected to the input end of the aftercooler 44, the output end of the aftercooler 44 is connected to the input end of the drying and pressure stabilizing device 45, and the output end of the drying and pressure stabilizing device 45 is connected to the input end of each regulating valve group outside the air source module. The compressor inlet of the embodiment of the present invention is arranged with an air intake buffer device, which controls the start and stop of the compressor according to the outlet pressure of the auxiliary compressor, and allows the compressor to run intermittently under low load to maintain the intake pressure and pressure ratio of the main compressor, so as to avoid the main compressor intake pressure being too low, and the pressure ratio, exhaust temperature and compression power consumption being too high when running at low load and low flow.

[0055] The gas transmission terminal control module 2 includes the same number of regulating valve groups 21 and expanders 22 as the intelligent control cabinet, the input end of each regulating valve group 21 is connected to the output end of the drying and pressure stabilizing device 45, the output end of each regulating valve group 21 is connected to the input end of the corresponding expander 22, and the output end of each expander 22 is connected to the air inlet end of the heat exchanger of the corresponding intelligent control cabinet; preferably, the output end of the drying and pressure stabilizing device 45 is respectively connected to the input end of each regulating valve group 21 through the air supply main pipe 5. The expander is connected in parallel between the compressed air supply main pipe and each intelligent control cabinet, and the pressure of the compressed air itself is used for expansion and cooling, which can improve the performance coefficient of the refrigeration process and reduce energy consumption.

[0056] The auxiliary module 3 includes the same number of auxiliary compressors 31 as the expander 22, each of the auxiliary compressors 31 is coaxially arranged with a corresponding expander 22, the input end of each auxiliary compressor 31 is connected to the outlet end of the heat exchanger of the corresponding intelligent control cabinet, and the output end of each auxiliary compressor 31 is connected to the input end of the precooler 41. Preferably, the output end of each auxiliary compressor 31 is connected to the input end of the precooler 41 through the exhaust main pipe 6. The compressed air is subjected to work by the expander, and after cooling, it is passed into the heat exchanger for cabinet cooling; at the same time, an auxiliary compressor coaxial with the expander is arranged to recover the output work of the expander, and the exhaust gas from the outdoor cabinet is compressed in the auxiliary compressor to increase the intake pressure of the main compressor and reduce the compression work of the main compressor.

[0057] The environmental control device suitable for the substation intelligent control cabinet provided in the embodiment of the present invention makes the environmental adjustment device safer, more reliable and energy-saving by designing a centralized environmental control device for a large number of outdoor intelligent control cabinets in the substation, thereby promoting the intelligent control process of the substation intelligent control cabinet.

[0058] Another embodiment of the present invention provides an environmental control method applicable to a substation intelligent control cabinet, which is applied to the environmental control device applicable to the substation intelligent control cabinet as described above. For details, see Figure 2 , Figure 2 The flowchart of the environmental control method applicable to the intelligent control cabinet of a substation in one embodiment of the present invention is shown, which includes steps S1 to S3, which are specifically as follows:

[0059] S1. Obtain temperature and humidity data in each intelligent control cabinet in real time;

[0060] S2, processing the temperature data and the humidity data to obtain a processing and judgment result of an abnormal intelligent control cabinet;

[0061] S3. Generate a corresponding first control instruction to enable the gas source module to input dry air to the corresponding abnormal intelligent control cabinet through the gas transmission terminal control module until the abnormal intelligent control cabinet meets the preset normal environmental conditions.

[0062] The above content is the logic of the temperature and humidity control method of the embodiment of the present invention. Preferably, in the above embodiment, the normal environmental conditions specifically include: within a preset time period, the temperature in the intelligent control cabinet where the abnormality is detected is within the preset normal temperature range, and the humidity in the intelligent control cabinet where the abnormality is detected is within the preset normal humidity range. Of course, the normal temperature range needs to be selected in combination with the various device models and design requirements of the product, and is not specifically limited here.

[0063] In addition, the environmental control method suitable for the substation intelligent control cabinet provided in an embodiment of the present invention also includes controlling the corresponding regulating valve group and the electric heating device in the abnormal intelligent control cabinet to perform matching operations according to the first control instruction, so as to enhance the control effect inside the abnormal intelligent control cabinet.

[0064] In addition to the regulation of temperature and humidity, the embodiment of the present invention also designs the regulation of pressure, as follows:

[0065] Acquire the outlet pressure of each auxiliary compressor in real time;

[0066] When it is detected that the outlet pressure of the auxiliary compressor is less than the preset auxiliary compressor outlet pressure low value, a corresponding second control instruction is generated and sent to the compressor, so that the compressor stops extracting the compressed air inside the intake buffer device, and the corresponding compressed air discharged by the auxiliary compressor is stored in the intake buffer device until the outlet pressure of the corresponding auxiliary compressor reaches the auxiliary compressor outlet pressure low value; when it is detected that the outlet pressure of the auxiliary compressor is greater than the preset auxiliary compressor outlet pressure high value, a corresponding third control instruction is generated and sent to the compressor, so that the compressor starts to extract the compressed air inside the intake buffer device until the outlet pressure of the corresponding auxiliary compressor reaches the auxiliary compressor outlet pressure high value. Of course, the above-mentioned auxiliary compressor outlet pressure low value and auxiliary compressor outlet pressure high value need to be selected in combination with the various device models and design requirements of the product, and are not specifically limited here.

[0067] In addition, with respect to the regulation of the drying and voltage stabilizing device, the embodiment of the present invention also includes the following contents:

[0068] Acquiring the internal pressure of the drying and pressure-stabilizing device in real time;

[0069] When it is detected that the internal pressure of the drying and stabilizing device is greater than the preset drying and stabilizing device pressure value, a corresponding fourth control instruction is generated and sent to the drying and stabilizing device, so that the drying and stabilizing device opens the pressure relief valve to reduce its internal pressure until the internal pressure of the drying and stabilizing device is less than or equal to the drying and stabilizing device pressure value. Of course, the above-mentioned drying and stabilizing device pressure value needs to be selected in combination with the various device models and design requirements of the product, and is not specifically limited here.

[0070] To explain the method flow of the embodiment of the present invention in detail, another embodiment of the present invention further provides a flow of a temperature and humidity control method applicable to a substation intelligent control cabinet, and the specific contents are as follows:

[0071] Step 1: Start the air source module. After being compressed by the compressor, the air enters the aftercooler for cooling and dehumidification, and then enters the drying and pressure stabilizing device to obtain compressed air at room temperature and dryness, and then enters the compressed air supply main pipe;

[0072] Step 2: The controller reads the temperature and humidity values ​​detected by the sensing module. When the internal gas temperature of the intelligent control cabinet detected by the sensing module is higher than the set upper temperature limit, the following step 3 is executed;

[0073] When the internal gas temperature of the intelligent control cabinet detected by the sensing module is lower than the set temperature lower limit or the humidity is higher than the set upper limit, the following step 4 is executed;

[0074] When the internal gas temperature of the intelligent control cabinet detected by the sensing module is less than or equal to the set temperature upper limit value and greater than or equal to the set temperature lower limit value, and the internal gas humidity of the control cabinet is less than or equal to the set humidity upper limit value, execute the following step five.

[0075] Step 3: Open the regulating valve group, and the dry compressed air flows from the compressed air supply main pipe through the regulating valve group, and then enters the expander for further expansion and cooling, and the low-temperature dry atmospheric pressure air is obtained and enters the heat exchanger of the intelligent control cabinet to reduce the internal temperature and humidity of the intelligent control cabinet;

[0076] Step 4: Start the electric heater to increase the internal gas temperature and reduce the internal gas relative humidity;

[0077] Step 5: Close the regulating valve group and the electric heater;

[0078] Step 6: The controller reads the outlet pressure of the auxiliary compressor and the internal pressure of the drying pressure stabilizing device. When the outlet pressure of the auxiliary compressor is less than the preset low value of the outlet pressure of the auxiliary compressor, the following step 7 is executed;

[0079] When the auxiliary compressor outlet pressure is greater than the preset auxiliary compressor outlet pressure high value, executing the following step eight;

[0080] Step 7: The compressor stops extracting the compressed air inside the air intake buffer device;

[0081] Step 8: Start the compressor to extract the compressed air inside the air intake buffer device;

[0082] Step 9: The controller reads the internal pressure of the drying and stabilizing pressure device. When the internal pressure of the drying and stabilizing pressure device is greater than the preset pressure value of the drying and stabilizing pressure device, the following step 10 is executed;

[0083] Step 10: Open the pressure relief valve of the drying pressure stabilizing device to reduce its internal pressure.

[0084] An embodiment of the present invention provides an environment control device and method applicable to a substation intelligent control cabinet, and the beneficial effects are at least one of the following:

[0085] (1) By designing centralized environmental control devices for a large number of outdoor intelligent control cabinets in substations, the environmental conditioning devices are made safer, more reliable and more energy-efficient, which promotes the intelligent control process of substation intelligent control cabinets;

[0086] (2) The main equipment such as gas source module, pipeline, regulating valve group, expander, auxiliary compressor, etc. are arranged outside the intelligent control cabinet, which significantly reduces the number of temperature and humidity adjustment equipment inside the intelligent control cabinet, facilitates centralized monitoring and control, and is convenient for maintenance and repair, without shutting down the corresponding intelligent control cabinet and primary equipment;

[0087] (3) Connecting the expander in parallel between the compressed air supply main pipe and each intelligent control cabinet, and using the compressed air's own pressure to expand and cool, can improve the performance coefficient of the refrigeration process and reduce energy consumption;

[0088] (4) Arrange an auxiliary compressor coaxial with the expander to recover the output power of the expander. Perform a first-stage compression on the exhaust gas from the control cabinet in the auxiliary compressor, which can increase the intake pressure of the compressor in the air source module, reduce the compression ratio of the air in the compressor and the compression work consumed, and further reduce the energy consumption of the entire compressed air refrigeration system;

[0089] (5) An intake buffer device is arranged at the compressor inlet to control the start and stop of the compressor according to the outlet pressure of the auxiliary compressor. The compressor can be operated intermittently under low load to maintain the intake pressure and pressure ratio of the main compressor, avoiding the main compressor intake pressure being too low, the pressure ratio, exhaust temperature and compression power consumption being too high when the compressor is running at low load and low flow rate;

[0090] (6) The prior art uses an open environmental control device. When the climate is humid, the compressed air discharged from the compressor needs to be continuously dehumidified by the aftercooler, resulting in a significant increase in energy consumption. In the present invention, the air used as the cooling medium circulates inside the device, and its humidity is basically not affected by the ambient humidity, so the dehumidification load is small and the energy consumption is low;

[0091] (7) The present invention can adopt a high-pressure system to increase the air pressure at the expander outlet and the compressor inlet, reduce the compressor suction specific volume, and reduce the pressure ratio, thereby reducing the size of the pipelines and components of the substation outdoor intelligent control cabinet environmental control device, thereby compensating for the shortcoming of the small unit volume cooling capacity of the air refrigeration system.

[0092] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An environmental control device suitable for a substation intelligent control cabinet, characterized in that: It includes a controller and a sensing module respectively controlled by the controller, a gas transmission terminal control module arranged outside the intelligent control cabinet, an auxiliary module, and at least one group of gas source modules; The sensing module includes a temperature and humidity sensor disposed in each intelligent control cabinet; The air source module includes a precooler, an air intake buffer device, a compressor, an aftercooler and a drying and pressure stabilizing device connected in sequence; The gas transmission terminal control module includes the same number of regulating valve groups and expanders as the intelligent control cabinet, the input end of each regulating valve group is connected to the output end of the drying and pressure stabilizing device, the output end of each regulating valve group is connected to the input end of the corresponding expander, and the output end of each expander is connected to the air inlet end of the heat exchanger of the corresponding intelligent control cabinet; The auxiliary module includes the same number of auxiliary compressors as the expanders, each of the auxiliary compressors is coaxially arranged with a corresponding expander, the input end of each auxiliary compressor is connected to the outlet end of the heat exchanger of the corresponding intelligent control cabinet, and the output end of each auxiliary compressor is connected to the input end of the precooler.

2. The environmental control device suitable for a substation intelligent control cabinet according to claim 1, characterized in that: The output end of the drying and pressure stabilizing device is respectively connected to the input end of each of the regulating valve groups through an air supply main pipe.

3. The environmental control device suitable for a substation intelligent control cabinet according to claim 1, characterized in that: The output end of each auxiliary compressor is connected to the input end of the precooler through an exhaust main pipe.

4. An environmental control method applicable to a substation intelligent control cabinet, applied to an environmental control device applicable to a substation intelligent control cabinet as claimed in any one of claims 1 to 3, characterized in that: The environmental control method applicable to the intelligent control cabinet of a substation includes: Obtain temperature and humidity data in each intelligent control cabinet in real time; Processing the temperature data and the humidity data to obtain a processing and judgment result of an abnormal intelligent control cabinet; Generate a corresponding first control instruction to enable the gas source module to input dry air to the corresponding abnormal intelligent control cabinet through the gas transmission terminal control module until the abnormal intelligent control cabinet meets the preset normal environmental conditions.

5. The environmental control method applicable to the intelligent control cabinet of a substation according to claim 4, characterized in that: The normal environmental conditions specifically include: During a preset time period, the temperature inside the intelligent control cabinet where the abnormality is detected is within a preset normal temperature range, and the humidity inside the intelligent control cabinet where the abnormality is detected is within a preset normal humidity range.

6. The environmental control method applicable to the intelligent control cabinet of a substation according to claim 4, characterized in that: The environmental control method applicable to the intelligent control cabinet of a substation also includes: According to the first regulating instruction, the corresponding regulating valve group and the electric heating device in the abnormal intelligent control cabinet are controlled to perform matching operations.

7. The environmental control method applicable to the intelligent control cabinet of a substation according to claim 4, characterized in that: The environmental control method applicable to the intelligent control cabinet of a substation also includes: Acquire the outlet pressure of each auxiliary compressor in real time; When it is detected that the outlet pressure of the auxiliary compressor is less than a preset auxiliary compressor outlet pressure low value, a corresponding second control instruction is generated and sent to the compressor, so that the compressor stops extracting the compressed air inside the air intake buffer device, and the compressed air discharged by the corresponding auxiliary compressor is stored in the air intake buffer device until the outlet pressure of the corresponding auxiliary compressor reaches the auxiliary compressor outlet pressure low value; When it is detected that the outlet pressure of the auxiliary compressor is greater than the preset auxiliary compressor outlet pressure high value, a corresponding third control instruction is generated and sent to the compressor, so that the compressor starts to extract the compressed air inside the intake buffer device until the corresponding outlet pressure of the auxiliary compressor reaches the auxiliary compressor outlet pressure high value.

8. The environmental control method applicable to the intelligent control cabinet of a substation according to claim 7, characterized in that: The environmental control method applicable to the intelligent control cabinet of a substation also includes: Acquiring the internal pressure of the drying and pressure-stabilizing device in real time; When it is detected that the internal pressure of the drying pressure-stabilizing device is greater than the preset pressure value of the drying pressure-stabilizing device, a corresponding fourth control instruction is generated and sent to the drying pressure-stabilizing device to cause the drying pressure-stabilizing device to open the pressure relief valve to reduce its internal pressure until the internal pressure of the drying pressure-stabilizing device is less than or equal to the pressure value of the drying pressure-stabilizing device.

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