KR20120140418A - Photovoltaic module - Google Patents

Abstract

PURPOSE: A photovoltaic module is provided to check generated power in real time by including a monitoring unit with a screen. CONSTITUTION: A photovoltaic module includes a solar cell module, a microinverter(250), a control unit(260), and a connection unit(180). The microinverter converts DC generated from the solar cell module into AC. The control unit controls the operation of the microinverter. The connection unit is connected to a power network to which external power is inputted and supplies AC to the power network. The control unit controls the operation of the microinverter to match the AC with the external power inputted to the power network. [Reference numerals] (250) Microinverter; (260) Control unit

Description

Solar Modules {Photovoltaic module}

The present invention relates to a photovoltaic module, and to a photovoltaic module capable of supplying electric power generated from a solar cell module to a power grid by a simple connection with a power grid flowing into a home.

Recently, with the anticipation of depletion of existing energy sources such as oil and coal, there is increasing interest in alternative energy to replace them. Among them, solar cells are in the spotlight as next generation cells that directly convert solar energy into electrical energy using semiconductor devices.

An object of the present invention is to provide a solar module that can easily supply power generated in the solar cell module to the power grid flowing into the home.

Solar module according to an embodiment of the present invention for achieving the above object, the solar cell module, a micro-inverter for converting the DC power generated in the solar cell module into an AC power source, a control unit for controlling the operation of the micro-inverter and external power is The connection unit may be connected to the incoming power grid to supply AC power to the power grid, and the controller may control the operation of the micro-inverter so that the AC power is matched with external power flowing into the power grid.

The solar cell module may include a junction box positioned on one surface of the solar cell module and including a bypass diode unit and a capacitor unit. The micro inverter and the controller may be located in the junction box.

In addition, the junction box includes an output current sensing unit sensing an output current of the micro inverter and an output voltage sensing unit sensing an output voltage of the micro inverter, and the controller is configured to operate the micro inverter based on the output current and the output voltage. To control.

In addition, the junction box or the connection unit may include a first communication module, and the solar module may further include a monitoring unit including a second communication module capable of communicating with the first communication module.

At this time, the monitoring unit detects external power, the second communication module transmits the sensed external power to the first communication module, and the controller controls the operation of the micro-inverter based on the external power received by the first communication module.

According to an embodiment of the present invention, the photovoltaic module has a micro inverter and a connection portion, thereby supplying the power generated by the solar cell module by a simple connection with the power grid flowing into the home, thereby consuming the power flowing into the home. Can be reduced.

In addition, including a monitoring unit including a screen, it is possible to check the amount of power generated in the solar module in real time.

1 is a block diagram of a solar module according to an embodiment of the present invention.
2 is a front view of a solar module according to an embodiment of the present invention.
3 is a rear view of the solar module of FIG. 2.
4 is an exploded perspective view of the solar cell module of FIG. 2.
FIG. 5 is an example of a bypass diode configuration of the solar module of FIG. 2.
6 is an example of an internal circuit diagram of a junction box of the solar module of FIG. 2.
FIG. 7 illustrates a voltage versus current curve of the solar cell module of FIG. 2.
FIG. 8 illustrates a power versus voltage curve of the solar cell module of FIG. 2.
9 is a configuration diagram of a solar module according to an embodiment of the present invention.
10 is a configuration diagram of a solar module according to an embodiment of the present invention.
11 is a configuration diagram of a solar module according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

In the drawings, each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size of each component does not entirely reflect the actual size, and the same identification code will be used for the same component.

In addition, suffixes "module" and " part "for the components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

1 is a block diagram of a solar module according to an embodiment of the present invention.

Referring to FIG. 1, the solar module 100 according to an embodiment of the present invention may include a solar cell module 50, a junction box 170, and a connection unit 180 that may be connected to the power grid 190. Can be. In addition, the junction box 170 may include a micro inverter 250 and a controller 260.

On the other hand, Figure 1 illustrates a solar module 100 having one solar cell module 50 and one junction box 170, on the other hand, the solar module 100 is a plurality of solar cell modules ( 50 and one junction box 170 may be provided. Alternatively, the solar module 100 may include one solar cell module 50 and a plurality of junction boxes 170 corresponding to the number of solar cell strings in each solar cell module. Hereinafter, the solar module 100 of FIG. 1 will be described.

The solar cell module 50 converts sunlight into a direct current power source. The solar cell module 50 will be described later in detail with reference to FIGS. 2 to 5.

The micro inverter 250 converts the DC power produced by the solar cell module 50 into AC power. To this end, the micro inverter 250 may be provided with a plurality of switching elements. This will be described later with reference to FIG. 6.

The connection unit 180 is connected to the electric power grid 190 in which external power flows into the house, and supplies the AC power converted by the micro inverter 250 to the electric power grid 190. The connection unit 180 may be an outlet type or a plug type or may have two mixed forms.

For example, the power grid 190 introduced into the home may be a home electrical wiring network provided with power supplied by KEPCO, and various power supply units such as R1, R2, and R3 are present in the power grid 190. Can be connected in parallel by multiple outlets.

The connection unit 180 may be connected to any one of a plurality of outlets connected to the power grid 190 and connected to the power grid 190. Thereby, the solar modules 100 serving as new power sources are also connected in parallel. Therefore, since the photovoltaic module 100 supplies a part of the power consumed by the ac power device, it is possible to reduce the consumption of external power flowing into the house.

On the other hand, since both the external power supplied to the power grid 190 and the AC power that is converted and supplied by the micro-inverter 250 are AC powers whose phase changes with time, these two power supplies must match to overlap between the two AC power supplies. By this, the waveform is not damaged.

In particular, the frequency and phase of the two AC power supplies must be the same to prevent attenuation of the amplitude and distortion of the waveform due to the superposition of the two AC power supplies. In addition, when the amplitude of the AC power supplied by the micro-inverter 250 is equal to the amplitude of the external power supplied to the power grid 190, the AC power converted by the micro-inverter 250 is supplied effectively. 190).

On the other hand, when the external power supplied to the power grid 190 is an AC power supply having, for example, 220V and 60Hz, the voltage and frequency of the external power supply do not always remain the same, but with a slight error, Supplied.

The external power is detected by the connection unit 180 or the monitoring unit 210 described later with reference to FIG. 9 (210 of FIG. 9), and the controller 260 is based on the external power supplied to the power grid 190 and the micro inverter 250. The operation of the micro-inverter 250 is controlled to match the AC power supplied by the conversion.

That is, the output current detected by the output current detecting unit (E of FIG. 6) of the micro inverter 250 and the output voltage detected by the output voltage detecting unit (F of FIG. 6) are described later in the connection unit 180 or FIG. 9. Control the operation of the micro-inverter 250 to match the external power detected by the monitoring unit (210 in FIG. 9).

For example, when the voltage of the external power flowing into the power grid 190 increases momentarily, the controller 260 increases the turn-on duty of the switching element in the micro inverter 250 to instantaneously increase the micro inverter ( The operation of the micro inverter 250 may be controlled so that the level of the output current and the output voltage of the 250 increases.

2 is a front view of a solar module according to an embodiment of the present invention, Figure 3 is a rear view of the solar module of Figure 2, Figure 4 is an exploded perspective view of the solar cell module of FIG.

2 to 4, the photovoltaic module 100 according to the embodiment of the present invention includes a solar cell module 50 and a junction box 170 positioned on one surface of the solar cell module 50. Can be. In addition, the solar module 100 may further include a heat dissipation member (not shown) disposed between the solar cell module 50 and the junction box 170.

First, the solar cell module 50 may include a plurality of solar cells 130. In addition, the first sealing member 120 and the second sealing member 150 positioned on the top and bottom surfaces of the plurality of solar cells 130, the front substrate 110 and the second located on the upper surface of the first sealing member 120. The substrate 150 may further include a rear substrate 160 positioned on an upper surface of the sealant 150.

The solar cell 130 is a semiconductor device that converts solar energy into electrical energy, and may be formed as a light receiving surface on which solar light is incident and a back surface opposite to the light receiving surface.

For example, the solar cell 130 includes a first conductive silicon substrate, a second conductive semiconductor layer formed on the silicon substrate and having a conductivity opposite to the first conductive type, and the second conductive semiconductor layer. An anti-reflection film formed on the second conductivity-type semiconductor layer, the at least one opening exposing at least one surface thereof, and a front electrode contacting a part of the second conductivity-type semiconductor layer exposed through the at least one opening; It may be a silicon solar cell that may include a back electrode formed on the back of the silicon substrate, but is not limited thereto. The solar cell 130 may include a compound semiconductor solar cell and Tandem solar cells, and the like.

 The plurality of solar cells 130 are electrically connected in series, in parallel, or in parallel and parallel to each other by the ribbon 133 to form a string 140. Specifically, the ribbon 133 may connect the front electrode formed on the light receiving surface of the solar cell 130 and the rear electrode formed on the back surface of another adjacent solar cell 130 by a tabbing process. The tabbing process may be performed by applying flux to one surface of the solar cell 130, placing the ribbon 133 on the flux-applied solar cell 130, and then firing the same.

Alternatively, a conductive film (not shown) may be attached between one surface of the solar cell 130 and the ribbon 133, and then the plurality of solar cells 130 may be connected in series or in parallel by thermal compression. The conductive film (not shown) is conductive particles formed of gold, silver, nickel, copper, etc. having excellent conductivity are dispersed in a film formed of an epoxy resin, an acrylic resin, a polyimide resin, a polycarbonate resin, or the like. Particles are exposed to the outside of the film, the exposed conductive particles can be electrically connected to the solar cell 130 and the ribbon 133. As such, when the plurality of solar cells 130 are connected and modularized by a conductive film (not shown), the process temperature may be lowered to prevent bending of the string 140.

In the figure, the ribbon 133 is formed in two lines, by the ribbon 133, the solar cells 130 are connected in a row, illustrating that the solar cell string 140 is formed. As a result, six strings 140a, 140b, 140c, 140d, 140e, and 140f are formed, and each string includes ten solar cells. Unlike the drawings, various modifications are possible.

In addition, each solar cell string may be electrically connected by a bus ribbon. FIG. 2 shows that the first solar cell string 140a and the second solar cell string 140b are formed by the bus ribbons 145a, 145c, and 145e disposed under the solar cell module 50, respectively. The battery string 140c and the fourth solar cell string 140d illustrate that the fifth solar cell string 140e and the sixth solar cell string 140f are electrically connected. In addition, FIG. 2 shows the 2nd solar cell string 140b and the 3rd solar cell string 140c, respectively, by the bus ribbon 145b, 145d arrange | positioned on the upper part of the solar cell module 50, The 4th aspect It illustrates that the battery string 140d and the fifth solar cell string 140e are electrically connected.

On the other hand, the ribbon connected to the first string, the bus ribbons 145b and 145d, and the ribbon connected to the fourth string are electrically connected to the first to fourth conductive lines 135a, 135b, 135c, and 135d, respectively. And the first to fourth conductive lines 135a, 135b, 135c, and 135d are connected to the bypass diodes Da, Db, Dc, and Dd in the junction box 170 disposed on the rear surface of the solar cell module 50. do. In the drawings, the first to fourth conductive lines 135a, 135b, 135c, and 135d extend to the rear surface of the solar cell module 50 through openings formed on the solar cell module 50.

On the other hand, it is preferable that the junction box 170 is further disposed adjacent to an end portion of which the conductive line extends from both ends of the solar cell module 50.

2 and 3, since the first to fourth conductive lines 135a, 135b, 135c, and 135d extend from the upper portion of the solar cell module 50 to the rear surface of the solar cell module 50, the junction box 170. ) Illustrates that the solar cell module 50 is located above the back of the solar cell module 50. As a result, the length of the conductive line can be reduced, and power loss can be reduced.

Unlike FIGS. 2 and 3, when the first to fourth conductive lines 135a, 135b, 135c, and 135d extend from the bottom of the solar cell module 50 to the rear surface of the solar cell module 50, the junction box 170 may be located at the bottom of the rear surface of the solar cell module 50.

The first sealant 120 may be positioned on the light receiving surface of the solar cell 130, and the second sealant 140 may be positioned on the rear surface of the solar cell 130, and the first sealant 120 and the second sealant 140 may be disposed on the rear surface of the solar cell 130. ) Adheres by lamination to block moisture, oxygen, and the like, which may adversely affect the solar cell 130. The first sealant 120 and the second sealant 140 may be an ethylene vinyl acetate copolymer resin (EVA), polyvinyl butyral, ethylene vinyl acetate partial oxide, silicon resin, ester resin, olefin resin, or the like. have.

The front substrate 110 is located on the first sealing member 120, and is preferably formed of tempered glass to protect the solar cell 130 from external impact and the like and transmit sunlight. In addition, it is more preferable that it is a low iron tempered glass containing less iron in order to prevent reflection of sunlight and increase the transmittance of sunlight.

The back substrate 160 is a layer that protects the solar cell from the back side of the solar cell 130, and functions as a waterproof, insulating and UV blocking, and may be a TPT (Tedlar / PET / Tedlar) type, but is not limited thereto. . In addition, the rear substrate 160 is preferably made of a material having excellent reflectivity so that it can be reused by reflecting the sunlight incident from the front substrate 110 side, the double-sided solar cell is formed of a transparent material that can enter the sunlight You can also implement modules.

The solar cell module 50 generates a DC power, and the micro-inverter described in FIG. 1 converts the DC power supplied from the solar cell module 50 into AC power and outputs the AC power. For example, the micro-inverter may be located in the junction box 170 to be described later, but is not limited thereto. For example, the micro-inverter may be provided in the connection unit 180 as illustrated in FIG. 11.

The junction box 170 is attached on the rear surface of the solar cell module 50 and includes bypass diodes Da, Db, and Dc which prevent current from flowing back between the solar cell strings. In addition, the junction box 170 may include a capacitor unit for storing a DC power source, and may include circuit elements such as the micro inverter and the controller described with reference to FIG. 1. In order to protect these circuit elements, the inside of the junction box 170 may be coated with a moisture barrier.

Meanwhile, during operation of the junction box 170, high heat is generated from the bypass diodes Da, Db, Dc, and Dd, and the generated heat is a specific solar cell arranged at a position where the junction box 170 is attached. The efficiency of 130 can be reduced.

To prevent this, the solar module 100 according to the embodiment of the present invention may further include a heat dissipation member (not shown) disposed between the solar cell module 50 and the junction box 170. At this time, in order to effectively dissipate heat generated from the junction box 170, the area of the heat dissipation member (not shown) is preferably larger than the area of the junction box 170. For example, it may be formed on all of the rear surface of the solar cell module 50. In addition, the heat dissipation member (not shown) is preferably formed of a metal material such as gold (Au), silver (Ag), copper (Cu), aluminum (Al), tungsten (W) having good thermal conductivity.

FIG. 5 is an example of a bypass diode configuration of the solar module of FIG. 2.

Referring to the drawings, the bypass diodes Da, Db, and Dc may be connected to the six solar cell strings 140a, 140b, 140c, 140d, 140e, and 140f. Specifically, the first bypass diode Da is connected between the first solar cell string and the first bus ribbon 145a, so that the first solar cell string 140a or the second solar cell string 140b is connected. When the reverse voltage is generated, the first solar cell string 140a and the second solar cell string 140b are bypassed.

For example, when a voltage of approximately 0.6V generated in a normal solar cell occurs, the potential of the cathode electrode is about 12V (= 0.6V * 20) relative to the potential of the anode electrode of the first bypass diode Da. Becomes higher. That is, the first bypass diode Da performs normal operation instead of bypass.

On the other hand, in one solar cell of the first solar cell string 140a, when a hot spot occurs due to shading or foreign matter adheres, the voltage generated in one solar cell is approximately 0.6V. The reverse voltage (approximately -15V) is generated rather than the voltage of. Accordingly, the potential of the anode electrode of the first bypass diode Da becomes about 15V higher than that of the cathode electrode. Accordingly, the first bypass diode Da performs the bypass operation. Therefore, the voltage generated by the solar cells in the first solar cell string 140a and the second solar cell string 140b is not supplied to the junction box 170. As described above, when a reverse voltage generated in some solar cells is generated, bypassing can prevent destruction of the solar cell. In addition, it is possible to supply the generated DC power, except for the hot spot area.

Next, the second bypass diode Db is connected between the first bus ribbon 145a and the second bus ribbon 145b to connect the third solar cell string 140c or the fourth solar cell string 140d. When the reverse voltage is generated, the third solar cell string 140c and the fourth solar cell string 140d are bypassed.

Next, the third bypass diode Dc is connected between the first solar cell string and the first bus ribbon 145a to reverse the first solar cell string 140a or the second solar cell string 140b. When voltage is generated, the first solar cell string and the second solar cell string are bypassed.

Meanwhile, unlike FIG. 5, six bypass diodes may be connected to six solar cell strings, and various other modifications are possible.

6 is an example of an internal circuit diagram of a junction box of the solar module of FIG. 2.

Referring to FIG. 6, the junction box 170 may include a bypass diode unit 270, a capacitor unit 280, a micro inverter 250, and a controller 260. In addition, a converter unit 290 may be further included between the micro inverter 250 and the capacitor unit 280.

The bypass diode unit 270 includes the first to fourth nodes disposed between the a node, the b node, the c node, and the d node corresponding to the first to fourth conductive lines 135a, 135b, 135c, and 135d, respectively. Third bypass diodes Da, Db, and Dc are included.

The capacitor unit 280 stores the DC power supplied from the solar cell module 50. In the figure, the three capacitors Ca, Cb, and Cc are illustrated in parallel connection, but may be connected in series or in series-parallel mixed connection.

The micro inverter 250 converts DC power into AC power. In the figure, a full-bridge inverter is illustrated. That is, the upper arm switching elements Sa and Sb and the lower arm switching elements S'a and S'b, which are connected in series with each other, become a pair, and a total of two pairs of upper and lower arm switching elements are parallel to each other (Sa & S'a, Sb & S'b). Diodes are connected in anti-parallel to each of the switching elements Sa, S'a, Sb, and S'b.

On the other hand, the photovoltaic module 100 according to the present invention is connected to the power grid (190 in FIG. 1) in order to supply power, so that the external power and micro-inverter supplied to the power grid (190 of FIG. 1) The AC power supplied by conversion at 250 should be matched so that the waveform is not damaged by the superposition between the AC power supplies.

Accordingly, the controller 260 may match the output current ic3 detected by the output current detector E of the micro inverter 250 and the output voltage Vc3 detected by the output voltage detector F with an external power source. To control the operation of the micro-inverter 250. That is, the switching elements in the micro inverter 250 are turned on / off based on the inverter switching control signal Sic from the controller 260. As a result, an AC power supply having a predetermined frequency is output.

For example, when the voltage of the external power flowing into the electric power grid 190 of FIG. 1 increases momentarily, the controller 260 increases the turn-on duty of the switching element in the micro inverter 250 and instantaneously. The operation of the micro inverter 250 may be controlled to increase the level of the output current and the output voltage of the micro inverter 250.

Meanwhile, the converter unit 290 may be further included between the micro-inverter 250 and the capacitor unit 280, and the converter unit 290 performs level conversion using the DC power stored in the capacitor unit 280. . In the figure, a flyback converter using the turn-on timing of the switching element S1 and the turns ratio of the transformer T is illustrated. As a result, the level of the DC power may be boosted and supplied to the micro inverter 250.

Meanwhile, the input current detector A detects the current ic1 supplied to the converter unit 290, and the input voltage detector B is input to the converter unit 290, that is, the capacitor unit 280. Senses the voltage vc1 stored in < RTI ID = 0.0 > The sensed current ic1 and voltage vc1 are input to the controller 260.

In addition, the output current detector C detects the current ic2 output from the converter 290, and the output voltage detector D detects the voltage vc2 output from the converter 290. do. The sensed current ic2 and voltage vc2 are input to the controller 260.

At this time, the controller 260 determines whether the sensed DC currents ic1 and ic2 and the DC voltages vc1 and vc2 can be converted to a level to be output from the micro-inverter 250 to thereby operate the converter 290. To control.

In addition, the controller 260 may perform power optimization control through a maximum power determination algorithm (MPPT). This will be described later with reference to FIGS. 7 and 8.

7 illustrates a voltage versus current curve of the solar cell module of FIG. 2, and FIG. 8 illustrates a voltage versus power curve of the solar cell module of FIG. 2.

First, referring to FIG. 7, as the open voltage Voc supplied from the solar cell module 50 increases, the short current supplied from the solar cell module 50 decreases. According to the voltage current curve L, the corresponding voltage Voc is stored in the capacitor unit 280 provided in the junction box 170.

Meanwhile, referring to FIG. 8, the maximum power Pmpp supplied from the solar cell module 50 may be calculated by a maximum power point tracking algorithm (MPPT). For example, while reducing the open voltage Voc from the maximum voltage V1, power is calculated for each voltage, and it is determined whether the calculated power is the maximum power. Since the power increases from the voltage V1 to the voltage Vmpp, the calculated power is updated and stored. In addition, since the power decreases from the Vmpp voltage to the V2 voltage, eventually, Pmpp corresponding to the Vmpp voltage is determined as the maximum power.

On the other hand, the maximum power determination algorithm (MPPT) may be performed in consideration of characteristics (input power or output power) of another solar cell module. That is, power optimization may be performed in consideration of characteristics with other modules.

9 is a configuration diagram of a solar module according to an embodiment of the present invention.

9, a solar module 200 according to an embodiment of the present invention includes a junction box 170 that may include a solar cell module 50, a micro-inverter 250, and a controller 260. The connection unit 180 may be connected to the power grid 190. In addition, the monitoring unit 210 may further include a connection to the power grid 190 at a point spaced from the connection unit 180.

The connection unit 180 is connected to the power grid 190, whereby the solar module 100 serving as a new power source is connected in parallel with an external power supply for supplying power to the power grid 190. Therefore, since the photovoltaic module 100 supplies a part of the power consumed by the ac power device, it is possible to reduce the consumption of external power flowing into the house.

In addition, the connection unit 180 or the junction box 170 may include a first communication module (not shown) to communicate with the monitoring unit 210. The first communication module (not shown) is a photovoltaic module based on the output current ic3 and the output voltage Vc3 detected by the output current detector E of FIG. 8 and the output voltage detector F of FIG. 8. The power 200 generates the generated power to the monitoring unit 210.

The monitoring unit 210 includes a second communication module and a screen. Accordingly, the monitoring unit 210 receives and displays the amount of power generated by the solar module 100 transmitted by the first communication module located in the connection unit 180 or the junction box 170 on the screen. In addition, the monitoring unit 210 detects the external power flowing into the power grid 190 and displays it on the screen, which is transmitted to the second communication module (not shown) in the connection unit 180 or the junction box 170.

Communication between the second communication module of the monitoring unit 210 and the first communication module located in the connection unit 180 or the junction box 170 may be based on short-range communication such as Wi-Fi, power line communication, but is not limited thereto. no.

On the other hand, based on the information on the external power received from the communication module in the connection unit 180 or junction box 170, the control unit 260 is the AC power supplied by the micro-inverter 250 to the power grid 190 The operation of the micro inverter 250 is controlled to match the external power supplied.

As such, when the monitoring unit 210 is connected to the power grid 190 at a point spaced apart from the connection unit 180, the amount of power may be displayed on the screen, and thus it may be confirmed in real time.

10 is a configuration diagram of a solar module according to an embodiment of the present invention, Figure 11 is a configuration diagram of a solar module according to an embodiment of the present invention.

First, referring to FIG. 10, the solar module 300 according to an embodiment of the present invention may include a solar cell module 50, a micro-inverter 250, and a control box 260. And a connection unit 180 that can be connected to the power grid 190. The solar module 300 of FIG. 10 is identical to the solar module 200 of FIG. 9, but illustrates that the monitoring unit 310 may be integrally formed with the connection unit 180 connected to the power grid 190. .

In addition, the solar module 400 of FIG. 11 includes a solar cell module 50, a junction box 170, and a connection unit 180 that may be connected to the power grid 190. However, unlike the photovoltaic module 100 of FIG. 1, the micro-inverter 250 and the controller 260 may be located in the connection unit 480.

Meanwhile, the solar module 400 of FIG. 11 may also further include the same monitoring unit as shown in FIGS. 9 and 10.

The solar module according to the present invention is not limited to the configuration and method of the embodiments described as described above, the embodiments are a combination of all or some of the embodiments selectively so that various modifications can be made It may be configured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Claims (14)

Solar cell module;
A micro inverter converting the DC power generated in the solar cell module into AC power;
A control unit controlling an operation of the micro inverter; And
And a connection unit connected to an electric power grid into which external electric power is introduced to supply the AC power to the electric power grid.
The controller controls the operation of the micro-inverter so that the AC power is matched with the external power flowing into the power grid. The method of claim 1,
In the solar cell module,
A plurality of solar cells;
A first sealant and a second sealant formed on lower and upper surfaces of the plurality of solar cells;
A rear substrate formed on a bottom surface of the first sealing material; And
And a front substrate formed on an upper surface of the second sealing material. The method of claim 2,
A junction box located on the rear substrate,
The junction box has a bypass diode portion and a capacitor portion,
The micro inverter and the control unit is a solar module located in the junction box. The method of claim 3,
The junction box,
An output current sensing unit sensing an output current of the micro inverter; And
And an output voltage detector configured to detect an output voltage of the micro inverter.
The control unit is configured to control the operation of the micro inverter based on the output current and the output voltage. The method of claim 3,
The junction box or the connection unit includes a first communication module,
The solar module further comprises a monitoring unit having a second communication module capable of communicating with the first communication module. The method of claim 5,
The monitoring unit detects the external power, the second communication module transmits the detected external power to the first communication module,
The controller controls the operation of the micro-inverter based on the external power received from the first communication module. The method according to claim 6,
The monitoring unit includes a screen, wherein the screen displays the sensed external power. The method of claim 7, wherein
The first communication module transmits the amount of power generated by the solar module to the second communication module, the screen displays the amount of power received by the second communication module. The method of claim 5,
The monitoring module is connected to the power grid in a position spaced apart from the connection. The method of claim 1,
The micro inverter and the control unit is a solar module located in the connection. The method of claim 5,
Communication between the first communication module and the second communication module is a photovoltaic module by short-range communication or power line communication. The method of claim 5,
The solar module is formed integrally with the connection portion and the monitoring unit. The method of claim 1,
The solar cell module is connected to the power grid in parallel. The method of claim 3,
And a heat dissipation member between the rear substrate and the junction box.

Images