KR101922016B1 - Apparatus of photovoltaic power generation system with dew condensation prediction and preventional function - Google Patents

Abstract

The present invention relates to a solar power generation apparatus having a function of predicting and preventing dew condensation. The solar power generation apparatus comprises: a plurality of solar cell arrays generating DC voltage and current; a fuse unit connected to an output terminal of each of the solar cell arrays in series; a reverse voltage preventing unit; a voltage measurement unit measuring voltage of each output terminal of a fuse; a current measuring unit measuring current of an output terminal of the reverse voltage preventing unit; an internal temperature sensor measuring an internal temperature of a connection board; a high pressure PCB surface temperature sensor; a humidity sensor; a control unit predicting a humidity to have dew condensation; a fan heater preventing the dew condensation; a communication device and a control unit generating a control signal; a connection board including a switch for blocking a closed circuit; an inverter; and a monitoring system.

Description

TECHNICAL FIELD [0001] The present invention relates to a photovoltaic (PV) generator having condensation prediction and prevention functions,

The present invention relates to a photovoltaic power generation apparatus having a condensation prediction and prevention function, and more particularly to a photovoltaic power generation apparatus capable of predicting the occurrence of condensation, which causes a fire in a connection panel, And a condensation prediction and prevention function for informing the manager immediately when the prevention is difficult.

As the photovoltaic power generation industry is increasing due to the depletion of fossil fuels and the risk of nuclear power generation, researches on efficient management of photovoltaic power generation systems along with safe operation are increasing.

DC power generated through the solar cell array is connected to the inverter through the connection panel, and the inverter converts the direct current to AC and is used. As for the cause of fire in the photovoltaic power generation system, fire in the connection part occupies most of the total fires. During the daytime power generation, air inside the heated connection panel is cooled down, causing condensation to form on the outside of the enclosure, and condensation inside the connection panel in an environment with high humidity such as rain or mist. .

When the condensation occurs, the conductive path is formed at the point where the distance between the gaps of the inner surface of the connection board is shortest. When the arc is generated, when the current is continuously supplied, the arc continuously occurs, It ignites the material and develops in fire.

In order to prevent the occurrence of such a fire, a humidity sensor is required to predict the occurrence of condensation and to prevent the occurrence of condensation. The type (a) and the structure (b) of the electric humidity sensor are shown in FIG.

The saturated water vapor pressure, which is closely related to the occurrence of condensation, is a function of temperature only, and this relationship is obtained from the Clausius-clapeyron equation. When water and water vapor are in equilibrium, the Clausius-Clapey Long equation is as shown in equation (1).

[Equation 1]

Where e _sv represents the saturated water vapor pressure for water, L _wv represents the latent heat of vaporization of water, and α _v and α _w represent the _{volumetric properties} of water vapor and water. Since? _v ?? _w If we ignore α _w and summarize α _v = R _v · T / e _sv .

&Quot; (2) "

Here, if the latent heat is assumed to be a constant by neglecting the change with temperature and integrated, it is expressed by Equation (3).

&Quot; (3) "

Using Equation 3, the saturated water vapor pressure for a specific temperature T can be obtained. According to the Meteorological Observation Equipment and Observation Guidelines of the World Meteorological Organization, when the temperature is 273.16 K and the saturated water vapor pressure is 6,112 hPa in Equation 3, the method of obtaining the saturated water vapor pressure at a specific temperature is expressed by Equation (4).

&Quot; (4) "

The condensation phenomenon is a phenomenon in which the water vapor contained in the air is lowered and the present water vapor pressure does not change but only the saturated water vapor pressure is reduced, and finally the water vapor reaches the saturated state and the dew is formed. The temperature at which the dew is formed is called a condensation temperature or a dew point temperature, and a graph showing such a correlation is shown in FIG. 1A (b).

In Fig. 1A (b), when the temperature of the point P is T and the water vapor pressure is e, when the water vapor pressure rises to the point C, condensation occurs. At this time, the water vapor pressure is E and E is the saturated water vapor pressure. Therefore, the relative humidity at point P is (e / E) × 100 (%). While the water vapor pressure is kept constant at the point P, condensation occurs when the temperature falls to T _d , which is the temperature of the point A, which meets the saturated water vapor pressure curve at T. On the other hand, it increases to a point, the temperature at which condensation occurs, the temperature T _d of the B point of intersection with the saturation vapor pressure curve at T _d 'is, water vapor pressure while keeping the temperature at the P point P is increased.

On the other hand, since the place where the conventional photovoltaic power generation apparatus is installed is a region with high humidity, the condensation phenomenon frequently occurs inside the connection panel, and the risk of fire is very high.

In addition, even if the external sensor senses the condensation phenomenon, the possibility of condensation can not be predicted, and there is a problem that the manager can not grasp the condensation in advance.

Even if the manager is contacted, there is a problem that the manager can not cope with a fire that needs to be prepared promptly if he / she is absent or does not contact within a certain time.

Korean Patent Registration No. 1470348 Korean Patent Registration No. 1470349 Korean Patent Registration No. 1560345 Korean Patent Registration No. 1391876

In order to solve the above-mentioned problems, the present invention provides a device for predicting and determining a dew condensation phenomenon occurring inside a connection panel of a solar power generation apparatus, thereby providing a solar power generation device for eliminating the risk of fire of the solar power generation device .

Another object of the present invention is to provide a photovoltaic power generation apparatus capable of automatically preventing the condensation when the condensation phenomenon generated inside the connection panel is predicted and preventing the risk of a fire accident in advance.

The present invention also contemplates the possibility of condensation by comparing the surface temperature of the high-pressure PCB with the condensation temperature in order to maintain or stop the state of the fan heater to prevent condensation, And to provide a solar power generation device which can be prevented from being generated.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a solar cell array comprising: a plurality of solar cell arrays generating a DC voltage and generating a current; A fuse unit connected to each output terminal of the plurality of solar cell arrays in such a manner that DC voltages generated in the plurality of solar cell arrays are merged and supplied to an inverter; A reverse voltage prevention unit connected in series to the fuse to allow current to flow only in one direction; A voltage measuring unit measuring a voltage of each output terminal of the fuse; A current measuring unit for measuring an output terminal current of the reverse voltage prevention unit; An internal temperature sensor for measuring the internal temperature of the connection panel; A humidity sensor for measuring the relative humidity inside the connection panel; A high-pressure PCB surface temperature sensor for measuring the surface temperature of the high-pressure PCB, which is liable to lead to a fire accident due to reduced insulation distance when condensation occurs; A controller for predicting the humidity to be formed in the current condensation based on the measured internal temperature, internal relative humidity, and high-pressure PCB surface temperature; A fan heater connected to the humidity sensor in accordance with a result of the calculation to automatically prevent condensation; When it is determined that it is difficult to prevent the condensation prevention operation for a predetermined time by controlling the sensors, the fan heater, and the switch, or the condensation prevention operation through the humidity sensor, a control signal for notifying the user of the alarm is generated according to the control signal A communication device and a control unit; And a switch for blocking a closed circuit between the solar cell array and the inverter in accordance with the control signal; An inverter for converting DC power supplied from the connection module into AC power; And a monitoring system for monitoring the operation state and abnormality of the solar cell array, the connection panel, and the inverter.

Wherein the communication device and the control unit are configured to calculate the saturation vapor pressure measured by the internal temperature sensor, the current water vapor pressure measured and calculated by the humidity sensor, and the condensation temperature calculated using the saturated steam pressure and the surface temperature of the high- And transmits the predicted condensation occurrence probability to the monitoring system.

And a wireless terminal connected to the connection unit through a communication device and a control unit through a network to monitor an operation state and an abnormality between the solar cell array and the inverter.

Further comprising a meteorological observer installed in the vicinity of the plurality of solar cell arrays to acquire meteorological information and convert the acquired information into data and transmit the data to the monitoring system, Includes insolation information.

It is possible to detect the condensation phenomenon on the inner board which is the cause of the fire, to prevent condensation, and to notify the manager when the condensation prevention control is out of the control range, so that the fire can be prevented in advance.

The present invention also relates to a method of controlling an electronic apparatus, comprising the steps of: S10 / S20 / S30 transmitting internal temperature, relative humidity, and surface temperature values to a communication device and a control unit through an internal temperature sensor, a humidity sensor, Step S40 of obtaining the saturated water vapor pressure P _sat from the internal temperature T _i transmitted from the communication device and the control unit; S50, in which the communication device and the control unit obtain the current water vapor pressure P _vap from the saturated water vapor pressure P _sat and the relative humidity r _h ; Step S60 of the communication device and the control unit obtaining the condensation temperature T _d from the present water vapor pressure P _vap ; Step S70 that the communication unit and a control unit determining whether or not lower than the surface temperature T _s plus 1 ℃ the condensation temperature T _d value to predict the condensation; If it is determined in step S70 that the surface temperature T _s is lower than the condensation temperature T _d by 1 ° C through the communication device and the control unit, operation of the fan heater is started and step S90 ; If via the communication device and the control is determined to when the surface temperature T _s is higher than or equal to the value obtained by adding the 1 ℃ the condensation temperature T _d, it is greater than the surface temperature T _s plus 1 ℃ the condensation temperature T _d value condensation Determining whether the temperature T _d is lower than a value obtained by adding 2 ° C to the temperature T _d ; If it is determined that the surface temperature T _s is within the condition range of the condensation temperature T _d through the communication device and the control unit as a result of the determination, the step S 10 is to maintain the fan-heater state and perform the procedure to the step S 10 / S 20 / S 30. If it is determined through the communication device and the control unit that the surface temperature T _s is not within the condition range of the condensation temperature T _d , then it is determined whether the surface temperature T _s is higher than or equal to a value obtained by adding 2 ° C to the condensation temperature T _d step; If it is determined in step S100 that the surface temperature T _s is lower than the condensation temperature T _d plus 2 ° C through the communication device and the control unit, the fan heater state is maintained and the tenth, twentieth, Step S110 of executing the procedure to step S110; If it is determined through the communication device and the control unit that the surface temperature T _s is higher than or equal to the condensation temperature T _d plus 2 ° C, the fan heater is stopped, and the procedure is performed in steps 10, 20, ; The S120 step the determination result, when the communication device and a control is fan heater operation time is less than the t _limit, step 10, step 20, the implementation of the procedures in Step 30, and the communication device and the control operating time than t _limit If it is greater than or equal to the predetermined value, generating an alarm and transmitting an information message to the monitoring system; And transmitting the alarm to the manager in step S150.

In step S40, the saturation water vapor pressure P _sat is obtained from the internal temperature T _i received by the communication device and the control unit using the following equation (5).

&Quot; (5) "

In step S50, the communication device and the control unit obtain the present water vapor pressure P _vap from the saturated water vapor pressure P _sat and the relative humidity r _h using the following equation (6).

&Quot; (6) "

In step S60, the communication device and the control unit obtain the condensation temperature T _d from the present water vapor pressure P _vap using the following equation (7).

The solar photovoltaic apparatus having the above-described construction having the condensation prediction and prevention function effectively removes condensation, which is the greatest factor of a fire, thereby preventing burning due to fire.

Further, in the present invention, it is possible to input various judging conditions such as surface temperature and condensation temperature to maintain or stop the fan heater state for preventing condensation, thereby effectively preventing condensation and securing safety.

Also, the present invention can prevent the condensation by predicting the occurrence of condensation, and when it is difficult to remove the condensation, it is possible to prevent the fire by sequentially informing the manager of the condensation according to the responsibility level.

In addition, the present invention has the effect of preventing real-time accidents by quickly managing and supervising the photovoltaic power generation device by informing the manager in turn of the risk state out of the control range of condensation prevention.

1A is a graph showing saturated water vapor pressure and condensation phenomena.
FIG. 1B is a schematic configuration diagram of a photovoltaic power generation apparatus having a condensation prediction and prevention function according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a schematic configuration diagram of the solar power generation apparatus having the condensation prediction and prevention function shown in FIG.
3 is a block diagram of a photovoltaic power generation apparatus having a condensation prediction and prevention function according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of the apparatus for predicting and preventing condensation of a solar power generation apparatus having a condensation prediction and prevention function according to an embodiment of the present invention.
5 is a block diagram illustrating a condensation prediction and prevention apparatus according to an embodiment of the present invention.
Fig. 6 shows types (a) and (b) of a generally used electric humidity sensor.

Hereinafter, other objects and features of the present invention will be apparent from the following description of embodiments with reference to the accompanying drawings.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless otherwise explicitly defined in the present application, are limited to an ideal or overly formal meaning It should not be interpreted.

FIG. 1B is a schematic configuration diagram of a photovoltaic device 100 having a condensation prediction and prevention function according to an embodiment of the present invention. FIG. 2 is a schematic view of a solar battery 100 having a condensation prediction and prevention function shown in FIG. FIG. 3 is a block diagram of a photovoltaic power generation apparatus having a condensation prediction and prevention function according to an embodiment of the present invention. Referring to FIG.

1B, the present invention includes a solar cell array, a connection board, an inverter, a monitoring system, and the like.

The DC power generated in the solar cell array 110 is supplied to the inverter 130 through the connection panel 120. Here, the connection unit 120 is connected to the monitoring system 140 and the wireless terminal 150 through a wireless communication network, and transmits and receives surface temperature, condensation temperature data, and the like. The communication method of the wireless communication network is the same as that of the Ethernet network, the wireless sensor network, the WiFi network, and the cellular network. The condensation prediction and prevention device 160 is located inside the connection block 120.

FIG. 2 is a schematic view of a solar cell power generation apparatus 100 having a condensation prediction and prevention function according to an embodiment of the present invention, and FIG. 3 is a block diagram of a solar cell power generation apparatus.

According to FIG. 3, a plurality of solar cell arrays 110 are connected in parallel. The solar cell array 110 is a circuit in which a plurality of solar cell modules are connected in series so as to satisfy a predetermined output voltage. Each of the solar cell modules has a plurality of solar cells connected in series and in parallel.

 The solar cell array 110 generates a direct current voltage and generates a current. The generated electric power flows along the closed circuit between the solar cell array 110, the connection board 120 and the inverter 130. [

The power generated in the solar cell array 110 is composed of the input power supplied to the inverter 130 and the output power passed through the inverter 130.

The connection board 120 is composed of a condensation prediction and prevention device 160, a high-voltage PCB 170, and a switch 175. The condensation prediction and prevention device 160 includes a communication device and a control unit 161, a high-pressure PCB surface temperature sensor 162, a humidity sensor 163, a connection half internal temperature sensor 164 and a fan heater 165 . The high voltage PCB 170 also includes a fuse 171, a reverse voltage prevention unit 172, a voltage measurement unit 173, and a current measurement unit 174.

The communication device and control unit 161 in the condensation prediction and prevention device 160 receives data measured from the high-pressure PCB surface temperature sensor 162, the humidity sensor 163 and the connection half internal temperature sensor 164, And operates the fan heater 165 based on the result to transmit the state of the solar array 110 and the interior of the connection unit 120 to the external monitoring system 140.

For example, when it is determined through the communication unit and the control unit 161 that the surface temperature T _s is lower than the condensation temperature T _d plus a certain temperature, the fan heater can be operated.

The communication device and control unit 161 may receive various other conditions for maintaining or stopping the fan heater state.

The high voltage PCB 170 further includes a voltage measurement unit 173 for measuring the voltage between the reverse voltage prevention units 172 connected in series with the fuse 171, And a current measuring unit 174.

The high-pressure PCB surface temperature sensor 162 is a sensor for measuring heat generated in each measuring part and a fuse or the like mounted inside the high-pressure PCB, and is connected to the communication device and the control part 161 together with the temperature measured by the connection- _Lt ; / RTI >

Therefore, when the temperature T _s of the surface of the high-voltage PCB is lowered and the surface of the high-voltage PCB falls below the condensation temperature T _d , condensation occurs.

The communication device and the control unit 161 compare the surface temperature and the condensation temperature to predict the condensation. That is, it is determined whether or not the surface temperature T _s is lower than the condensation temperature T _d plus a certain temperature.

The communication device and the control unit 161 transmit the switch disconnection information to the external monitoring system 140 and notify the manager. Also, the communication device and control unit 161 notifies the wireless terminal of the manager of the disconnection information of the switch 175. Therefore, it is possible to monitor the state of each part in real time to prevent the fire from occurring and efficiently manage the photovoltaic device 100 with quick action.

In one embodiment of the present invention, the communication device and the control unit 161 are configured to calculate the saturation vapor pressure measured and calculated by the internal temperature sensor, the current water vapor pressure measured and calculated by the humidity sensor, And transmits the predicted condensation occurrence probability to the monitoring system based on the surface temperature of the high-pressure PCB measured by the surface temperature sensor. The probability of occurrence of condensation is calculated according to the formula and judgment logic of the operation flow chart of FIG. 4 to be described later.

The present invention also includes a wireless terminal 150 connected through the connection unit, the communication unit, and the control unit 161 to monitor an operation state and an abnormality between the solar cell array and the inverter.

The wireless terminal 150 includes an administrator smartphone, a tablet PC, or a wearable device. The wireless terminal 150 is divided into vibration / voice, which is a type of a warning signal, It informs the status and abnormality, and it is possible to prevent fire in advance.

Also, the administrator mobile terminal is a terminal informing the manager of the risk according to the type of the warning signal.

And has an emergency call function for making an emergency call immediately when it wants to communicate with the final manager through the administrator mobile terminal.

The administrator mobile terminal or the administrator terminal may transmit a push message including the operation status and abnormality information to the administrator mobile terminal, or the administrator may process the call or emergency message by receiving the status notification in real time.

If the administrator who is the first person to be alerted is absent or does not get in touch within a certain period of time, control to contact the administrator terminals in the following communication sequence in order, or divide the administrator terminal class and select to contact .

According to another embodiment of the present invention, when the administrator mobile terminal selects the alarm message transmission setting screen and the alarm message transmission setting screen according to the fault information, the maximum number of alarms is fixed to the manager terminal So that the number of alarms is reduced in case of a specific manager's leave, and the number of alarms can be adjusted to a predetermined value or less when the working time has passed.

When the manager mobile terminal selects the temperature / humidity information setting screen for each solar array, the corresponding information is displayed and an alarm message set according to actual fire expected grade can be stored in advance.

For example, if the device manager is absent or is not contacted within a certain period of time, it is possible to control the next device manager terminal so that the alert message according to the fire grade is sequentially contacted.

Further comprising a meteorological observing section installed around the plurality of solar cell arrays to acquire meteorological information, convert the acquired information into data, and transmit the data to the monitoring system and an administrator mobile terminal, wherein the manager mobile terminal The acquired information includes temperature information and irradiation amount information.

Also, it is possible to prevent condensation by predicting the condensation phenomenon on the inner substrate of the connection panel, which is a cause of the fire, and to prevent fire by transferring it to the administrator mobile terminal when the condensation prevention control is out of the control range.

Hereinafter, operation modes of dew condensation prediction and dew condensation removal of a photovoltaic power generation apparatus having a condensation prediction and prevention function in addition to the condensation prediction and prevention function according to the present invention will be described with reference to FIG.

First, the communication device and the control unit receive the values of the internal temperature, the relative humidity, and the surface temperature through the internal temperature sensor, the humidity sensor, and the surface temperature sensor attached to the connection module (steps S10, S20, and S30).

Subsequently, the saturation water vapor pressure P _sat is obtained from the internal temperature T _i inputted by the communication device and the control unit using the following equation (5) (step S40).

&Quot; (5) "

Subsequently, the communication device and the control unit obtain the present water vapor pressure P _vap from the saturated water vapor pressure P _sat and the relative humidity r _h using the following equation (6) (step S50).

&Quot; (6) "

Subsequently, the communication device and the control unit obtain the condensation temperature T _d from the present water vapor pressure P _vap using the following equation (7) (step S60).

&Quot; (7) "

At this time, when the temperature T _s of the surface of the high-pressure PCB becomes lower and the surface of the high-pressure PCB falls below the condensation temperature T _d , condensation occurs.

The communication device and the control unit compare the surface temperature and the condensation temperature to predict the condensation. That is, it is determined whether the surface temperature T _s is lower than the condensation temperature T _d plus 1 ° C (step S70).

Here, the surface temperature (T _s) is At the condensation temperature (T _d) The reason for determining whether or not the temperature is lower than the value obtained by adding 1 占 폚 is to reduce the present water vapor pressure of the connection half air by activating the fan heater by the control signal of the control unit, If it is maintained at a high level, it is possible to prevent the occurrence of condensation, thereby preventing condensation on the surface of the high-voltage PCB.

If it is determined in step S70 that the surface temperature T _s is lower than the condensation temperature T _d by 1 ° C through the communication device and the control unit, the fan heater is operated, and the procedure proceeds to step S 120 ).

On the other hand, when it is judged that the surface temperature T _s is higher than or equal to the condensation temperature T _d plus 1 ° C through the communication device and the control unit, the surface temperature T _s is less than the condensation temperature T _d plus 1 ° C And it is determined whether or not it is larger than the value obtained by adding 2 DEG C to the condensation temperature T _d (step S80).

If it is determined in step S80 that the surface temperature T _s is within the range of the condensation temperature T _d through the communication device and the control unit, the fan heater state is maintained and the procedure is performed in steps 10, 20, (Step S110).

On the other hand, the communication if the device and the surface temperature T _s with the control unit is determined not to meet the criteria range of condensation temperature T _d, determines whether or not the surface temperature T _s the condensation temperature T _d to higher than the value obtained by adding the 2 ℃ or equal (Step S100).

Here, the surface temperature (T _s ) is The reason for determining whether or not the condensation temperature (T _d ) is higher than the value obtained by adding 1 ° C or lower than 2 ° C is that the condensation phenomenon that occurs in this way reduces the present water vapor pressure of the connection panel internal air, If the surface temperature of the portion not to be covered is maintained at a relatively high level, it is an optimum temperature for eliminating the occurrence of condensation. If the surface of the high-voltage PCB is maintained at 2 ° C or more above the dew point temperature, condensation can be sufficiently prevented, It is possible to prevent the power wastage by stopping the fan heater by the control signal of the control unit.

If it is determined in step S100 that the surface temperature T _s is lower than the condensation temperature T _d plus 2 ° C through the communication device and the control unit, the fan heater state is maintained and the tenth, twentieth, (Step S110).

On the other hand, if it is determined through the communication device and the control unit that the surface temperature T _s is higher than or equal to the condensation temperature T _d plus 2 ° C, the fan heater is stopped, and steps 10, 20, (Step S130).

If it is determined in step S120 that the communication device and the control unit are less than the _limit value of the fan heater operation time, steps 10, 20, and 30 are performed.

On the other hand, if the communication time and the control time are equal to or greater than t _limit , an alarm is generated and an information message is transmitted to the monitoring system (step S140).

The communication device and the control unit transmit the switch disconnection information to the external monitoring system and notify the manager of the switch disconnection information (step S150).

Further, the communication device and the control unit also notify the wireless terminal of the manager of the switch disconnection information. Therefore, it is possible to efficiently manage the photovoltaic power generation device having the condensation prediction and prevention function by preventing the fire from occurring and ensuring the safety fast.

In addition, the controller receives the sensor detection signal from the administrator mobile terminal, and informs the user of the danger by the speaker voice signal or the vibration device according to the type of the warning signal.

At the same time, a push message is transmitted to the administrator mobile terminal through the administrator mobile terminal or the administrator terminal, or the manager receives the status notification in real time and promptly takes a countermeasure or processes the emergency message.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

100: Photovoltaic device
110: solar cell array
120: Connection board
130: inverter
140: Monitoring device
150: wireless terminal
160: Condensation prediction and prevention device
161: Communication device and control section
162: High-pressure PCB surface temperature sensor
163: Humidity sensor
164: Connection panel internal temperature sensor
165: Fan heater
170: High-voltage PCB
171: Fuse section
172:
173: voltage measuring unit
174: current measuring unit
175: Switch

Claims (4)

A plurality of solar cell arrays generating a DC voltage and generating a current;
A fuse unit connected to each output terminal of the plurality of solar cell arrays in such a manner that DC voltages generated in the plurality of solar cell arrays are merged and supplied to an inverter;
A reverse voltage preventing unit connected in series to the fuse unit to allow current to flow in only one direction;
A voltage measuring unit for measuring a voltage of each output terminal of the fuse unit;
A current measuring unit for measuring an output terminal current of the reverse voltage prevention unit;
An internal temperature sensor for measuring the internal temperature of the connection panel;
A humidity sensor for measuring the relative humidity inside the connection panel;
A high-pressure PCB surface temperature sensor for measuring the surface temperature of the high-pressure PCB, which is liable to lead to a fire accident due to reduced insulation distance when condensation occurs;
A controller for predicting the humidity to be formed in the current condensation based on the measured internal temperature, internal relative humidity, and high-pressure PCB surface temperature;
The surface temperature (T _s) the condensation temperature (T _d) is lower than the sum of 1 ℃ value or the surface temperature (T _s) the condensation temperature (T _d) to the large condensation temperature higher than the value obtained by adding the 1 ℃ (T _d) 2 < 0 > C, and is automatically stopped when the surface temperature T _s is equal to or higher than the condensation temperature T _d plus 2 ° C;
A controller for generating a control signal for notifying a user of an alarm in accordance with a control signal when it is determined that the prevention of the condensation prevention operation is continued for a predetermined period of time by controlling each sensor, the fan heater, and the switch, Device and control;
And a switch for blocking a closed circuit between the solar cell array and the inverter in accordance with the control signal;
An inverter for converting DC power supplied from the connection module into AC power;
And a monitoring system for monitoring an operation state and an abnormality of the solar cell array, the connection panel, and the inverter,
Wherein the communication device and the control unit calculate the saturation vapor pressure measured by the internal temperature sensor, the current steam pressure measured and calculated by the humidity sensor, the condensation temperature calculated using the saturated steam pressure, and the surface temperature of the high- And the possibility of dew condensation which is predicted based on the result of the dew condensation is transmitted to the monitoring system. The dew condensation phenomenon on the inner substrate of the connection half which is the cause of the fire is predicted to be detected and the condensation is prevented. To prevent fire,
_Wherein the condensation temperature T _d is obtained from the present water vapor pressure P _vap using the following equation (7).
&Quot; (7) "

The method according to claim 1,
And a wireless terminal connected to the connection unit through a communication device and a control unit via a network to monitor an operation state and an abnormality between the solar cell array and the inverter. Generator. The method according to claim 1,
Further comprising a meteorological observer installed in the vicinity of the plurality of solar cell arrays to acquire meteorological information and convert the acquired information into data and transmit the data to the monitoring system, Wherein the solar radiation information includes solar radiation amount information. delete

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