CN115037034A - Automatic cooling and dehumidifying device for photovoltaic power generation box transformer substation, power distribution method and control method - Google Patents
Automatic cooling and dehumidifying device for photovoltaic power generation box transformer substation, power distribution method and control method Download PDFInfo
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- CN115037034A CN115037034A CN202210495255.4A CN202210495255A CN115037034A CN 115037034 A CN115037034 A CN 115037034A CN 202210495255 A CN202210495255 A CN 202210495255A CN 115037034 A CN115037034 A CN 115037034A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2101/00—Supply or distribution of decentralised, dispersed or local electric power generation
- H02J2101/20—Dispersed power generation using renewable energy sources
- H02J2101/22—Solar energy
- H02J2101/24—Photovoltaics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses an automatic cooling and dehumidifying device, a power distribution method and a control method for a photovoltaic power generation box transformer substation, belongs to the technical field of power systems, and can realize cooling and dehumidifying in the box transformer substation even if an external power grid is powered off by establishing a cooling and dehumidifying device consisting of a cooling and dehumidifying system, a grid-connected system, an energy storage system and a photovoltaic power generation system, so that the temperature and the humidity in the box transformer substation can be controlled, and the safe and reliable operation of the box transformer substation in a normal range is guaranteed. The photovoltaic panel is installed at the top end of the box transformer substation, sunlight is prevented from irradiating the top end of the box transformer substation, the internal environment temperature of the box transformer substation can be reduced, solar energy can be converted into electric energy to be output under the irradiation of the sunlight, the direct current electric fan and the dehumidifier preferentially use direct current of the photovoltaic power generation system, the loss of the box transformer substation is reduced, energy is saved, emission is reduced, and social benefits and economic benefits are improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a box transformer substation device, a power distribution method and a cooling and dehumidifying control method.
Background
The box transformer works and operates under a sealed environment, when sunlight irradiates for a long time in summer, components in the box transformer continuously operate and generate heat and are in the condition that air does not circulate, heat in the box body cannot be dissipated, so that the temperature in the box transformer is higher and higher easily, the temperature in the box transformer can reach more than 60 ℃, and the temperature exceeds the normal working temperature of the components and is not higher than 40 ℃. Along with the extension of operating time, the incasement temperature lasts the rising, and too high temperature not only can make the equipment component in the incasement oxidize in advance, age, shortens life, still can influence the safe operation of components and parts, causes the circuit breaker trip, still can lead to the burnout of components and parts even, causes the trouble to have a power failure.
When the box transformer is in plum rainy season, air in the box transformer is moist and high in humidity, water drops can appear on equipment, at the moment, the insulation performance of the equipment can be damaged under the condition that the box transformer is high in voltage, and the power failure phenomenon caused by short circuit fault of a power grid can be easily caused.
The problems that the internal environment of the box-type substation is in a damp state and the temperature is too high are solved, for example, Chinese patent document CN107272782A, an air circulation cooling and dehumidifying system and method of a box-type substation are adopted, and the temperature of high-temperature and high-humidity air is reduced by detecting with a temperature sensor and exchanging heat between a fan and a dehumidifier and outside air. However, because the box-type transformer is often installed in an outdoor closed environment, especially when the sun is directly illuminated in summer, the temperature in the box exceeds the ordinary temperature difference range, under the technical scheme, if a high-power fan is not additionally installed, the cooling effect of the technical scheme is unsatisfactory, if the high-power fan is installed, the energy consumption is too large, and once a power grid is powered off, the technical scheme cannot cool and dehumidify, so that the equipment safety is endangered.
Disclosure of Invention
In view of the problem that once the power grid fails to cool and dehumidify in the prior art, the invention aims to provide a technical scheme which is used for supplying power to photovoltaic systems, has controllable temperature and humidity in a box transformer substation, ensures safe and reliable operation of the box transformer substation in a normal range, and can achieve an energy-saving effect.
The technical scheme adopted by the invention is as follows: the utility model provides an automatic dehydrating unit that cools down of photovoltaic power generation case becomes, the device is connected in parallel by cooling dehumidification system, grid-connected system, energy storage system and photovoltaic power generation system and forms.
The photovoltaic power generation system comprises a photovoltaic panel and a photovoltaic controller, the photovoltaic panel is installed on the outer side of the top end of the box transformer substation, and the photovoltaic controller controls the photovoltaic panel to generate direct current to supply electricity to the cooling and dehumidifying system.
The cooling and dehumidifying system comprises a direct current electric fan, a dehumidifier and a temperature and humidity controller, wherein the temperature and humidity controller controls the opening or closing of the direct current electric fan or the dehumidifier.
The grid-connected system comprises a box transformer low-voltage grid-connected end, a bidirectional meter and a rectifier inverter and is used for receiving the inversion power transmission of the photovoltaic power generation system or supplying power to the cooling and dehumidifying system; the electric energy is transmitted in two directions through the rectifier inverter.
The energy storage system comprises an energy storage battery pack and a temperature control switch and is used for storing energy or supplying power to the cooling and dehumidifying system.
The temperature control switch monitors the operating temperature of the energy storage battery pack in real time, and when the temperature exceeds a temperature threshold value, the temperature control switch automatically disconnects the circuit connection so as to protect the energy storage battery pack.
The photovoltaic panel on the top of the box transformer substation generates electric energy, and the electric energy can be stored in the energy storage battery pack after passing through the photovoltaic controller and used by the direct current electric fan and the dehumidifier, and can also be inverted into alternating current to be transmitted to an external power grid through the bidirectional meter so as to provide electric energy for the outside.
The technical scheme adopted by the invention also provides a power distribution method of the automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation, which comprises the following steps:
s1: when the cooling and dehumidifying system operates, if the photovoltaic plate arranged at the outer top end of the box transformer substation is in photovoltaic power generation, the photovoltaic power generation system supplies power to the cooling and dehumidifying system;
s2: if the photovoltaic power generation system can not provide electric energy for the cooling and dehumidifying system, the grid-connected system supplies power for the cooling and dehumidifying system;
s3: if the grid-connected system is in a power-off state, the energy storage system supplies power to the cooling and dehumidifying system;
s4: when the cooling and dehumidifying system is not operated, if the energy storage system is not fully charged and the photovoltaic panel is in a power generation state, the photovoltaic power generation system supplies power to the energy storage system;
s5: and if the energy storage system is fully charged and the photovoltaic panel is in a power generation state, the photovoltaic power generation system transmits power to the box transformer low-voltage grid-connected end.
When the cooling and dehumidifying system does not work, if the photovoltaic panel arranged at the outer top end of the box transformer substation is in photovoltaic power supply, the photovoltaic power supply system firstly charges the energy storage system; and if the energy storage system reaches full load, the photovoltaic power supply system transmits power for sale to the low-voltage grid-connected end of the box transformer through the rectifier inverter.
The technical scheme adopted by the invention also provides an automatic cooling control method for the photovoltaic power generation box transformer substation, which comprises the following steps:
st 1: the temperature and humidity controller reads the temperature parameter of the environment in the box transformer substation and sets a temperature valve value;
st 2: judging whether the temperature of the internal environment of the box transformer substation is higher than 40 ℃;
st 3: according to step St2, if no, the direct current fan is turned off;
st 4: if yes, starting the direct current fan and reducing the temperature of the internal environment of the box transformer according to the step St 2;
st 5: according to the step St4, judging whether the temperature of the internal environment of the box transformer substation is lower than 40 ℃;
st 6: if no, according to step St5, the dc fan is kept running;
st 7: if yes, the dc fan is turned off according to step St 5.
When the temperature of the box transformer substation is too high, the temperature and humidity controller is started, and the direct-current electric fan discharges hot air in the box transformer substation, so that the effects of heat dissipation and temperature reduction of equipment are achieved.
The technical scheme adopted by the invention also provides an automatic dehumidification control method for the photovoltaic power generation box transformer substation, which comprises the following steps:
sp 1: the temperature and humidity controller reads the humidity parameter of the environment in the box transformer substation and sets a humidity threshold value;
sp 2: judging whether the humidity of the internal environment of the box transformer substation is higher than 90%;
sp 3: according to the step S2, if the judgment result is negative, the dehumidifier is closed;
sp 4: according to the step S2, if the judgment result is yes, the dehumidifier is started, and the humidity of the internal environment of the box transformer substation is reduced;
sp 5: according to the step S4, judging whether the humidity of the environment in the box transformer substation is lower than 90%;
sp 6: if not, the operation of the dehumidifier is maintained according to the step S5;
sp 7: if yes, the dehumidifier is turned off according to step S5.
When the humidity in the box transformer substation is too high, the temperature and humidity controller is started, and the dehumidifier starts to dehumidify so as to achieve the dehumidification effect of the equipment.
Furthermore, the photovoltaic panel is a monocrystalline silicon thin photovoltaic cell, and is packaged by toughened glass and waterproof resin, the peak working voltage is 41.7V, and the working current is 10.92A.
Further, the energy storage battery pack is a valve-controlled lead-acid storage battery for energy storage, and a single battery is 12V.
Further, the device also comprises a temperature sensor and a humidity sensor which sense the ambient temperature data and the humidity data in the box transformer.
Further, the device still includes humiture record appearance, monitors and records the real-time humiture of case becomes internal environment.
Furthermore, the device also comprises louver ventilation windows distributed on the peripheral side wall of the device.
Further, the device still includes remote communication controller and APP remote monitor, remote communication controller control temperature and humidity controller carries out temperature control or dehumidification control, APP remote monitor monitors the temperature or the humidity of case and becomes the internal environment.
Through setting up remote communication controller, make temperature and humidity controller realize remote control to improve work efficiency. Through setting up APP remote monitoring ware for temperature or humidity realize the remote monitoring function in the case becomes.
Compared with the prior art, the temperature reduction and dehumidification device formed by the temperature reduction and dehumidification system, the grid-connected system, the energy storage system and the photovoltaic power generation system can realize temperature reduction and dehumidification in the box transformer substation even if an external power grid is powered off, so that the temperature and the humidity in the box transformer substation are controllable, and the safe and reliable operation of the box transformer substation in a normal range is guaranteed. Meanwhile, the photovoltaic panel is arranged at the top end of the box transformer substation, sunlight is prevented from irradiating the top end of the box transformer substation, the internal environment temperature of the box transformer substation can be reduced, and the photovoltaic panel can convert solar energy into electric energy to be output under the irradiation of the sunlight.
According to the invention, through the power distribution method of the cooling and dehumidifying device, the direct current fan and the dehumidifier preferentially use the direct current of the photovoltaic power generation system, so that the purposes of reducing box transformer loss, saving energy and reducing emission are achieved, and the safe and reliable operation of electrical equipment is ensured. When the direct current generated by the photovoltaic panel is insufficient, the alternating current can be obtained from a box transformer substation low-voltage grid-connected end of the box transformer substation and rectified into the direct current to be used by the direct current fan and the dehumidifier, so that the sufficient power supply of the whole set of cooling and dehumidifying device is ensured.
According to the temperature reduction method for the temperature reduction and dehumidification device, when the temperature is higher than 40 ℃, the temperature and humidity controller is automatically started, the direct current fan starts to work, hot air on the upper layer of the box transformer substation is rapidly exhausted, and when the temperature is lower than 40 ℃, the temperature and humidity controller is automatically stopped, and the direct current fan does not work.
According to the dehumidification method for the cooling and dehumidifying device, when the humidity is higher than 90%, the temperature and humidity controller automatically starts the dehumidifying function of the dehumidifier to reduce the humidity in the box transformer substation to reach a reasonable range below 90%, and when the humidity is lower than 90%, the temperature and humidity controller automatically stops and the dehumidifier stops working.
Drawings
Fig. 1 is a diagram of an automatic cooling and dehumidifying device for a box transformer substation.
FIG. 2 is a flow chart of a power distribution method of the apparatus of the present invention.
FIG. 3 is a flow chart of a temperature control method according to the present invention.
FIG. 4 is a flow chart of a humidity control method of the present invention.
Fig. 5 is a side view of the box transformer substation of the present invention.
Fig. 6 is a temperature and humidity monitoring and tracking diagram of the box-type substation.
The attached drawings are marked as follows: the system comprises a photovoltaic panel 1, a photovoltaic controller 2, a temperature and humidity controller 3, a direct current fan 31, a dehumidifier 32, a louver 33, a rectifying inverter 4, a bidirectional meter 5, a box-to-low voltage grid-connected end 6, a temperature control switch 7 and an energy storage battery pack 8.
Detailed Description
The box transformer is a box type transformation station and is a compact complete set of distribution equipment consisting of distribution transformers. The inventor of the invention finds that in high-temperature weather, equipment in the box transformer substation works in a high-tide environment for a long time, heating defects of connecting parts such as hardware fittings, buses and the like in the box transformer substation occur frequently, and potential safety hazard risks are formed on the running and stable power supply of the equipment.
The main reason is that in humid weather, the humidity inside the box transformer substation is easy to exceed the standard, especially when rainy season comes, the humidity inside the box transformer substation can reach more than 95%, equipment inside the box transformer substation is in a humid working environment, various metal materials can be corroded, the electrical performance and the service life of the equipment are reduced, and the switch equipment can also be refused to operate and be operated mistakenly. In addition, the insulation strength of equipment in the box transformer substation is reduced, the insulation resistance value is reduced, the leakage current is increased, and even insulation breakdown is caused, so that accidents occur.
Example 1:
as shown in fig. 1, this embodiment 1 provides an automatic cooling and dehumidifying device for a photovoltaic power generation box transformer substation, and this embodiment 1 includes a cooling and dehumidifying system, a grid-connected system, an energy storage system and a photovoltaic power generation system, and the photovoltaic power generation system includes a photovoltaic panel 1 and a photovoltaic controller 2, and the photovoltaic panel 1 is installed on the top outside of the box transformer substation, and the photovoltaic controller 2 controls the photovoltaic panel 1 to generate direct current for the cooling and dehumidifying system to use electricity.
The photovoltaic panel 1 is a power generation device that generates direct current upon exposure to the sun in a photovoltaic power generation system, and is composed of a photovoltaic cell made of semiconductor silicon. The photovoltaic panel is a monocrystalline silicon thin photovoltaic cell and is packaged by toughened glass and waterproof resin, the peak working voltage is 41.7V, and the working current is 10.92A.
The temperature reduction and dehumidification system comprises a direct current fan 31, a dehumidifier 32 and a temperature and humidity controller 3, wherein the temperature and humidity controller 3 controls the opening or closing of the direct current fan 31 or the dehumidifier 32;
the direct current fan 31 is used for removing hot air in the box transformer internal environment to realize ventilation and cooling. The fan for direct current air exhaust with adjustable rotating speed, low noise and low power consumption is adopted.
The dehumidifier 32 converts the electric energy into heat energy to reduce the humidity of the inside environment of the tank transformer. Heat is generated by means of electrical resistance.
The temperature and humidity controller 3 has a temperature control range of-40 to 120 ℃ and a humidity control range of 0 to 99 rh.
The grid-connected system comprises a box transformer low-voltage grid-connected end 6, a bidirectional meter 5 and a rectifier inverter 4 and is used for receiving inverter transmission of the photovoltaic power generation system or supplying power to the cooling and dehumidifying system; and the low-voltage grid-connected end 6 of the box transformer substation is connected with an external power grid.
The rectifier inverter inverts the photovoltaic electricity into alternating current to be transmitted to a power grid, or rectifies the power grid electricity into direct current to be used by a direct current fan 31 or a dehumidifier 32, and the converted power is 10 KW.
The energy storage system comprises an energy storage battery pack 8 and a temperature control switch 7 and is used for storing energy or supplying power to the cooling and dehumidifying system.
The energy storage battery pack 8 is an energy storage component of the box transformer cooling and dehumidifying system. The energy storage battery pack 8 is a valve-controlled lead-acid storage battery for energy storage, and the single battery is 12V. The photovoltaic energy storage battery pack can be used as a standby power supply, and the system safety is enhanced. The photovoltaic energy storage battery pack can provide power for control and energy storage of the high-low voltage switch, remote control opening and closing operation can be performed on the switch under the condition that the main network of the external network is powered off, and the switch signal quantity and the temperature and humidity parameters in the box transformer substation are sensed.
This embodiment still includes temperature sensor, humidity transducer, humiture record appearance, remote communication controller and APP remote monitoring ware, and temperature sensor, humidity transducer and humiture record appearance measured data transfer for the humiture controller and handle, and remote communication controller and APP remote monitoring ware carry out the remote control operation to the humiture controller.
As shown in fig. 5, the photovoltaic panel 1 of the present embodiment 1 is installed on the top of the box transformer, the plurality of dc electric fans 31 are distributed on the upper portion of the lateral side of the box transformer, and the plurality of louvers 33 are distributed on the lateral side of the box transformer. The plurality of dc electric fans 31 and the louver 33 provide excellent ventilation and heat insulation effects for the box transformer.
The installation procedure of this example 1 is as follows:
the method comprises the following steps that firstly, a photovoltaic panel is installed at the top end of the box transformer substation, the top end of the box transformer substation is prevented from being irradiated by sunlight, the internal environment temperature of the box transformer substation can be reduced, and the photovoltaic panel can convert solar energy into electric energy under the irradiation of the sunlight.
And step two, installing an energy storage battery pack, adopting 9 storage batteries, storing redundant electric energy generated by the photovoltaic panel, providing reliable electric power guarantee for the box transformer substation, and using the peak-to-valley electricity price difference of the power grid as an energy storage system to obtain economic benefits.
And step three, installing a temperature and humidity controller.
And step four, installing a temperature sensor and a humidity sensor. A humidity sensor is additionally arranged in the box transformer substation to sense the change of the internal temperature and humidity, and temperature and humidity data are transmitted to a temperature and humidity control switch.
And step five, installing a direct current fan. Because the hot gas in the box transformer substation is positioned on the side surface of the upper part, the direct current electric fan is arranged on the side surface of the upper part of the box body, so that the hot gas is discharged.
And step six, installing a dehumidifier. When the humidity is larger, the dehumidification function is automatically started, the humidity in the box transformer substation is reduced, and a reasonable range is achieved.
And step seven, installing a bidirectional metering meter and a rectifying inverter.
In this embodiment 1, a dc system is adopted to work, so that the ac power of the box-type substation does not interfere with the dc equipment. The safe and reliable operation of the box transformer substation in a normal range is further guaranteed.
Example 2:
as shown in fig. 2, this embodiment 2 provides a power distribution method of an automatic cooling and dehumidifying apparatus for a photovoltaic power generation box transformer substation, which includes the following steps based on the foregoing embodiment 1:
s1: when the cooling and dehumidifying system operates, if the photovoltaic plate arranged at the outer top end of the box transformer substation is in photovoltaic power generation, the photovoltaic power generation system supplies power to the cooling and dehumidifying system;
s2: if the photovoltaic power generation system can not provide electric energy for the cooling and dehumidifying system, the grid-connected system supplies power for the cooling and dehumidifying system;
s3: if the grid-connected system is in a power-off state, the energy storage system supplies power to the cooling and dehumidifying system;
s4: when the cooling and dehumidifying system is not operated, if the energy storage system is not fully charged and the photovoltaic panel is in a power generation state, the photovoltaic power generation system supplies power to the energy storage system;
s5: and if the energy storage system is fully charged and the photovoltaic panel is in a power generation state, the photovoltaic power generation system transmits power to the box transformer low-voltage grid-connected end.
Specifically, when the cooling and dehumidifying system operates, if a photovoltaic panel mounted at the top end of the box transformer substation is in photovoltaic power supply, the photovoltaic power supply system directly supplies power to the cooling and dehumidifying system; if the photovoltaic power generation system can not provide electric energy for the cooling and dehumidifying system, the grid-connected system supplies power to the cooling and dehumidifying system; and if the grid-connected system is in a power-off state, the energy storage system supplies power to the cooling and dehumidifying system.
Example 3:
as shown in fig. 3, this embodiment 3 provides a method for cooling an automatic cooling and dehumidifying device for a photovoltaic power generation box transformer substation, which includes the following steps on the basis of the foregoing embodiment 2:
st 1: the temperature and humidity controller reads the temperature parameter of the environment in the box transformer substation and sets a temperature threshold value;
st 2: judging whether the temperature of the internal environment of the box transformer substation is higher than 40 ℃;
st 3: according to step St2, if no, the direct current fan is turned off;
st 4: if yes, starting the direct current fan and reducing the temperature of the internal environment of the box transformer according to the step St 2;
st 5: according to the step St4, judging whether the temperature of the internal environment of the box transformer substation is lower than 40 ℃;
st 6: if no, according to step St5, the dc fan is kept running;
st 7: if yes, the dc fan is turned off according to step St 5.
When the temperature of the box transformer substation is too high, the temperature and humidity controller is started, and the direct-current electric fan discharges hot air in the box transformer substation, so that the effects of heat dissipation and temperature reduction of equipment are achieved.
Example 4:
as shown in fig. 4, this embodiment 4 provides a dehumidification method of an automatic cooling and dehumidifying device for a photovoltaic power generation box transformer substation, which is based on the foregoing embodiment 2, and includes the following steps:
sp 1: the temperature and humidity controller reads the humidity parameter of the environment in the box transformer substation and sets a humidity threshold value;
sp 2: judging whether the humidity of the internal environment of the box transformer substation is higher than 90%;
sp 3: according to the step S2, if the judgment result is no, the dehumidifier is closed;
sp 4: according to the step S2, if the judgment result is yes, the dehumidifier is started, and the humidity of the internal environment of the box transformer substation is reduced;
sp 5: according to the step S4, whether the humidity of the internal environment of the box transformer substation is lower than 90% is judged;
sp 6: if not, the operation of the dehumidifier is maintained according to the step S5;
sp 7: if yes, the dehumidifier is turned off according to step S5.
When the humidity in the box transformer substation is too high, the temperature and humidity controller is started, and the dehumidifier starts to dehumidify so as to achieve the dehumidification effect of the equipment.
Example 5:
the invention will be further explained below using a humiture recorder in conjunction with specific data.
Taking the monitoring situation after the installation box of a certain area is changed as an example, the detection situation is shown in the following table 1:
table 1 parameters.
| Model of the device | USB-TH | Device name | USB temperature and humidity recorder |
| MAC address | 00000000 | Start-up delay | 0 |
| Recording interval | 00:05:00 | ||
| Upper limit of temperature | 100.0 | Upper limit of humidity | 100.0 |
| Lower limit of temperature | -40.0 | Lower limit of humidity | O.0 |
| Starting time | 2021-08-31 08:00:23 | End time | 2021-08-31 22:25:23 |
| Deriving time | 2021-09-10 22:28:52 | Total number of records | 174 |
| Maximum temperature | 39.5 | Maximum humidity | 72.3 |
| Minimum temperature | 25.7 | Minimum humidity | 35.0 |
| Mean temperature | 34.0 | Average humidity | 51.4 |
One of the sets of data is selected for verification. As shown in FIG. 6, the USB-TH USB temperature and humidity recorder 2021/08/3108: 00-2021/08/3122: 25 has the upper dark line as humidity line and the lower light line as temperature line. 2021.8.31, continuous temperature and humidity data of 33 ℃ of the environment temperature, 8 to 20 points of the environment temperature, 34.0 ℃ of the average temperature of the box transformer, 51.4hr of the average humidity, and good installation effect. As can be seen from fig. 6, the upper limit of the ambient air temperature of the apparatus must not be higher than 40 ℃, and its average temperature must not exceed 35 ℃ within 24 h; at a maximum temperature of 40 ℃ the relative humidity should not exceed 50%, at lower temperatures a greater relative humidity is allowed, but the average value of the relative humidity measured over 24 hours is not more than 95% and the average value of the monthly relative humidity is not more than 90%. The air temperature and humidity of the box-type transformer meet the requirements of DL/T593 and GB/T24274.
As described in the above embodiments, the device of the present invention has an automatic cooling and dehumidifying function. Install photovoltaic power generation board on the case becomes the top, directly absorb the sunlight and turn into the electric energy with it, avoided the case to become to penetrate directly through the sunlight and heat up, the case that reforms transform simultaneously becomes to realize inside electrical equipment's automation and dehumidifies the cooling, and the electrical equipment work in the guarantee case becomes guarantees electrical equipment safety and stability and moves in suitable environment.
Claims (10)
1. The utility model provides an automatic dehydrating unit that cools down of photovoltaic power generation case becomes which characterized in that: the system is formed by connecting a cooling and dehumidifying system, a grid-connected system, an energy storage system and a photovoltaic power generation system in parallel;
the photovoltaic power generation system comprises a photovoltaic panel and a photovoltaic controller, the photovoltaic panel is installed on the outer side of the top end of the box transformer substation, and the photovoltaic controller controls the photovoltaic panel to generate direct current to supply electricity to the cooling and dehumidifying system;
the temperature and humidity control system controls the opening or closing of the direct current electric fan or the dehumidifier;
the grid-connected system comprises a box transformer low-voltage grid-connected end, a bidirectional meter and a rectifier inverter and is used for receiving the inversion power transmission of the photovoltaic power generation system or supplying power to the cooling and dehumidifying system;
the energy storage system comprises an energy storage battery pack and a temperature control switch and is used for storing energy or supplying power to the cooling and dehumidifying system.
2. A power distribution method of an automatic cooling and dehumidifying device of a photovoltaic power generation box transformer substation is characterized by being applied to the cooling and dehumidifying device of claim 1, and comprises the following steps:
s1: when the cooling and dehumidifying system operates, if the photovoltaic plate arranged at the outer top end of the box transformer substation is in photovoltaic power generation, the photovoltaic power generation system supplies power to the cooling and dehumidifying system;
s2: if the photovoltaic power generation system can not provide electric energy for the cooling and dehumidifying system, the grid-connected system supplies power for the cooling and dehumidifying system;
s3: if the grid-connected system is in a power-off state, the energy storage system supplies power to the cooling and dehumidifying system;
s4: when the cooling and dehumidifying system is not operated, if the energy storage system is not fully charged and the photovoltaic panel is in a power generation state, the photovoltaic power generation system supplies power to the energy storage system;
s5: and if the energy storage system is fully charged and the photovoltaic panel is in a power generation state, the photovoltaic power generation system transmits power to the box transformer low-voltage grid-connected end.
3. An automatic cooling control method for a photovoltaic power generation box transformer substation is characterized by being applied to the cooling and dehumidifying device of claim 1, and comprising the following steps of:
st 1: the temperature and humidity controller reads the temperature parameter of the environment in the box transformer substation and sets a temperature valve value;
st 2: judging whether the temperature of the environment in the box transformer substation is higher than 40 ℃;
st 3: according to step St2, if no, the direct current fan is turned off;
st 4: according to step St2, if yes, the direct current fan is started, and the temperature of the environment in the box transformer substation is reduced;
st 5: according to the step St4, judging whether the temperature of the internal environment of the box transformer substation is lower than 40 ℃;
st 6: if no, according to step St5, the dc fan is kept running;
st 7: if yes, the dc fan is turned off according to step St 5.
4. An automatic dehumidification control method for a photovoltaic power generation box transformer substation is applied to the cooling and dehumidification device of claim 1, and comprises the following steps:
sp 1: the temperature and humidity controller reads the humidity parameter of the environment in the box transformer substation and sets a humidity threshold value;
sp 2: judging whether the humidity of the internal environment of the box transformer substation is higher than 90%;
sp 3: according to the step Sp2, if the judgment result is no, the dehumidifier is closed;
sp 4: according to the step Sp2, if yes, starting a dehumidifier, and reducing the humidity of the environment in the box transformer substation;
sp 5: according to the step Sp4, judging whether the humidity of the environment in the box transformer substation is lower than 90%;
sp 6: according to the step Sp5, if the judgment result is no, the operation of the dehumidifier is maintained;
sp 7: according to step Sp5, if yes, the dehumidifier is turned off.
5. The automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation according to claim 1, characterized in that: the photovoltaic panel is a monocrystalline silicon thin photovoltaic cell and is packaged by toughened glass and waterproof resin, the peak working voltage is 41.7V, and the working current is 10.92A.
6. The automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation according to claim 1, characterized in that: the energy storage battery pack is a valve-controlled lead-acid storage battery for energy storage, and a single battery is 12V.
7. The automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation according to claim 1, characterized in that: the device also comprises a temperature sensor and a humidity sensor which sense the environmental temperature data and the humidity data in the box transformer substation.
8. The automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation according to claim 1, characterized in that: the device also comprises a temperature and humidity recorder which monitors and records the real-time temperature and humidity of the internal environment of the box transformer substation.
9. The automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation according to claim 1, characterized in that: the device also comprises louver ventilation windows distributed on the peripheral side wall of the device.
10. The automatic cooling and dehumidifying device for the photovoltaic power generation box transformer substation according to claim 1, characterized in that: the device still includes remote communication controller and APP remote monitoring ware, remote communication controller control temperature and humidity controller carries out temperature control or dehumidification control, APP remote monitoring ware monitoring case becomes the temperature or the humidity of internal environment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210495255.4A CN115037034A (en) | 2022-05-07 | 2022-05-07 | Automatic cooling and dehumidifying device for photovoltaic power generation box transformer substation, power distribution method and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210495255.4A CN115037034A (en) | 2022-05-07 | 2022-05-07 | Automatic cooling and dehumidifying device for photovoltaic power generation box transformer substation, power distribution method and control method |
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| CN201134615Y (en) * | 2007-12-29 | 2008-10-15 | 郑州金源特变电气有限公司 | Solar cooling and drying equipment for premounting transformer substation |
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