KR101832229B1

KR101832229B1 - Photovoltaic module

Info

Publication number: KR101832229B1
Application number: KR1020110073017A
Authority: KR
Inventors: 장대희
Original assignee: 엘지전자 주식회사
Priority date: 2011-07-22
Filing date: 2011-07-22
Publication date: 2018-04-13
Also published as: KR20130011689A

Abstract

The present invention relates to a solar module. A solar module according to an embodiment of the present invention includes a front substrate, a rear substrate, a solar cell module including a solar cell between the front substrate and the rear substrate, An inverter unit disposed on the rear substrate and adapted to convert DC power supplied through the junction box to AC power, and a connection unit connected to the power network to which the power is supplied and supplying AC power to the power grid. This makes it possible to easily supply the electric power generated in the solar cell module to the power grid that flows into the house.

Description

{PHOTOVOLTAIC MODULE}

The present invention relates to a photovoltaic module, and more particularly, to a photovoltaic module capable of supplying power generated from a photovoltaic module to a power network by simple connection with a power network that flows into a house.

With the recent depletion of existing energy sources such as oil and coal, interest in alternative energy to replace them is increasing. Among them, solar cells are attracting attention as a next-generation battery that converts solar energy directly into electrical energy using semiconductor devices.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solar module capable of easily supplying electric power generated in a solar cell module to a power grid flowing into the house.

According to an aspect of the present invention, there is provided a solar module including a front substrate, a rear substrate, a solar cell module including a solar cell between the front substrate and the rear substrate, An inverter unit which is disposed on the rear substrate and converts the DC power supplied through the junction box to AC power, and an inverter unit which is connected to the power-supplied power network and supplies the AC power to the power grid Lt; / RTI >

The inverter unit includes a micro inverter for converting DC power into AC power and a control unit for controlling the operation of the micro inverter. The control unit controls the operation of the micro inverter so that the AC power matches the external power flowing into the power grid.

In addition, the inverter unit includes an output current sensing unit for sensing the output current of the microinverter and an output voltage sensing unit for sensing the output voltage of the microinverter. The control unit controls the operation of the microinverter based on the output current and the output voltage .

Further, the inverter section may further include a converter section.

The junction box includes a bypass diode unit and a capacitor unit, and is connected to the inverter unit to supply DC power.

The frame includes a female engaging portion including an upper engaging portion, a lower engaging portion, and a connecting engaging portion for connecting the upper engaging portion and the lower engaging portion, and a frame having an L- And the peripheral edge portion of the solar cell module is coupled to the female coupling portion to support the solar cell module.

Further, the frame may include a cover portion in which a part of the leg portion extends to cover the inverter portion.

It may also include a thermally conductive layer between the cover and the inverter.

Further, it may include a heat insulating layer between the inverter part and the rear substrate.

A radiating fin may be formed on the outer surface of the cover portion.

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

The second communication module transmits the detected external power to the first communication module, and the control unit controls the operation of the microinverter based on the external power received by the first communication module do.

In addition, the monitoring unit may include a screen, and the screen may display the sensed external power.

Also, the first communication module transmits the amount of power generated in the solar module to the second communication module, and the screen can display the amount of power received by the second communication module.

The monitoring unit may also be connected to the power grid at a location remote from the connection.

The communication between the first communication module and the second communication module can be performed by short-range communication or power line communication.

Further, the connection portion and the monitoring portion may be integrally formed.

According to an embodiment of the present invention, since the solar module includes the micro inverter and the connection unit, the power generated from the solar cell module is supplied by simple connection with the power grid that flows into the house, .

Further, since the frame supporting the solar cell module includes the cover portion covering the inverter portion, the heat generated in the inverter portion can be effectively radiated.

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

1 is a configuration 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.
5 is a cross-sectional view taken along line BB 'of FIG.
6 is an example of a bypass diode configuration of the solar module of FIG.
7 is an example of an internal circuit diagram of FIG.
FIG. 8 illustrates voltage versus current curves of the solar cell module of FIG. 2. FIG.
FIG. 9 illustrates a voltage versus power curve of the solar cell module of FIG.
10 is a view showing a connection method between the junction box, the inverter unit and the connection unit of the solar cell module of FIG.
11 is a configuration diagram of a solar module according to an embodiment of the present invention.
12 is a configuration diagram of a solar photovoltaic system according to an embodiment of the present invention.

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

In the following drawings, each component is exaggerated, omitted, or schematically shown for convenience and clarity of explanation. In addition, the size of each component does not completely reflect the actual size, and the same identification code is used for the same component.

Also, in the description of each element, in the case of being described as being formed "on" or "under", "on" and "under" directly "or" indirectly "through " other elements. "

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

Referring to FIG. 1, a solar module 100 according to an embodiment of the present invention includes a solar cell module 50, a junction box 170, an inverter unit 200, and a connection unit (180). The inverter unit 200 may include a microinverter 250 and a controller 260.

First, the solar cell module 50 generates a DC power source from the sunlight. The solar cell module 50 will be described in detail later with reference to FIG. 2 to FIG.

The junction box 170 is attached on the back surface of the solar cell module 50 and prevents reverse current flow between the solar cell strings and may include bypass diodes Da, Db, and Dc. This will be described in detail later with reference to FIG.

The inverter unit 200 may include a micro inverter 250 and a controller 260 so as to convert DC power generated by the solar cell module 50 into AC power.

The micro inverter 250 converts the DC power generated by the solar cell module 50 into AC power. To this end, the microinverter 250 includes a plurality of switching elements. In addition, the control unit 260 controls the operation of the micro inverter 250. [

The connection unit 180 is connected to a power network 190 into which external power flows into the house and supplies the AC power converted by the micro inverter 250 to the power grid 190. The connection 180 may be of the socket type or the plug type, or may have two mixing types.

For example, the electric power network 190 flowing into the house may be a domestic electric wiring network provided with electric power supplied from KEPCO, and various ac power devices such as R1, R2, and R3 may be present in the electric power network 190 By means of a plurality of outlets to be connected.

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

Since both the external power supplied to the power grid 190 and the AC power converted and supplied by the micro inverter 250 are AC power whose phases vary with time, these two power sources must be matched, The waveform is not damaged by overlapping.

In particular, since the frequency and phase of the two AC power sources must be the same, the attenuation of the amplitude and the distortion of the waveform due to the overlapping of the two AC power sources can be prevented. Also, when the amplitude of the alternating-current power supplied from the micro-inverter 250 is the same as the amplitude of the external power supplied to the power grid 190, the alternating-current power supplied from the micro- 190, respectively.

On the other hand, when the external power source supplied to the power grid 190 is an AC power source having, for example, 220 V and 60 Hz, the voltage and frequency of the external power source are not always kept the same, .

The external power is sensed by the connection unit 180 or a monitoring unit (410 of FIG. 11) described later in FIG. 11, and the control unit 260 controls the external power supplied to the power network 190 and the micro- And controls the operation of the micro-inverter 250 so that the AC power supplied from the micro-inverter 250 is converted.

That is, the output current of the microinverter 250 sensed by the output current sensing unit (E of FIG. 7) and the output voltage of the microinverter 250 sensed by the output voltage sensing unit (F of FIG. 7) ) Or an external power source sensed by a monitoring unit (410 of FIG. 11), which will be described later with reference to FIG. 11, to control the operation of the microinverter 250.

For example, when the voltage of the external power source flowing into the power network 190 instantaneously increases, the control unit 260 increases the turn-on duty of the switching element in the microinverter 250, The operation of the microinverter 250 can be controlled so that the output current and the output voltage level of the micro-inverter 250 rise.

On the other hand, the junction box 170, the inverter unit 200, and the connection unit 180 can be easily connected by the cable 210. Such a cable 210 will be described later with reference to Fig.

3 is a rear view of the solar cell module of Fig. 2, Fig. 4 is an exploded perspective view of the solar cell module of Fig. 2, and Fig. 5 is an exploded perspective view of the solar cell module of Fig. Sectional view of BB 'of FIG.

2 to 5, a solar cell module 100 according to an embodiment of the present invention includes a solar cell module 50 and a solar cell module 50, which are coupled with peripheral edge portions of the solar cell module 50, And a junction box 170 and an inverter unit 200 located on one side of the solar cell module 50. [

First, the solar cell module 50 may include a plurality of solar cells 130. The first sealing material 120 and the second sealing material 150 located on the upper and lower surfaces of the plurality of solar cells 130 and the front substrate 110 and the second sealing material 120 located on the upper surfaces of the first sealing material 120, And may further include a rear substrate 160 positioned on the upper surface of the sealing member 150.

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

For example, the solar cell 130 includes a silicon substrate of a first conductivity type, a second conductivity type semiconductor layer formed on the silicon substrate and having a conductivity type opposite to that of the first conductivity type, An antireflection film formed on the second conductive type semiconductor layer and having at least one opening exposing a part of the surface of the second conductive type semiconductor layer; And a rear electrode formed on the rear surface of the silicon substrate. However, the present invention is not limited thereto, and the solar cell 130 may be a compound semiconductor solar cell, A tandem solar cell, or the like.

The plurality of solar cells 130 are electrically connected in series, parallel or series-parallel 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 tableting process. The tableting process may be performed by applying a flux to one surface of the solar cell 130, placing the ribbon 133 on the flux-coated solar cell 130, and then subjecting the ribbon 133 to a firing process.

Alternatively, a conductive film (not shown) may be attached between one surface of the solar cell 130 and the ribbon 133, and then a plurality of solar cells 130 may be connected in series or in parallel by thermocompression bonding. The conductive film (not shown) is formed by dispersing conductive particles formed of gold, silver, nickel, copper or the like having excellent conductivity in a film formed of an epoxy resin, an acrylic resin, a polyimide resin, a polycarbonate resin or the like, The particles are exposed to the outside of the film, and the solar cell 130 and the ribbon 133 can be electrically connected by the exposed conductive particles. When a plurality of solar cells 130 are connected by modulating a conductive film (not shown), the process temperature is lowered, and warping of the string 140 can be prevented.

In the figure, it is illustrated that the ribbon 133 is formed in two lines, and the solar cell 130 is connected in series by the ribbon 133 to form the solar cell string 140. By this, six strings 140a, 140b, 140c, 140d, 140e and 140f are formed, and each string includes ten solar cells. However, unlike the drawings, various modifications are possible.

Further, each solar cell string can be electrically connected by a bus ribbon. 2 shows the first solar cell string 140a and the second solar cell string 140b respectively by the bus ribbons 145a, 145c and 145e disposed under the solar cell module 50, 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. 2 shows the second solar cell string 140b and the third solar cell string 140c respectively by the bus ribbons 145b and 145d disposed on the upper part of the solar cell module 50, And that the battery string 140d and the fifth solar cell string 140e are electrically connected.

The first seal member 120 may be located on the light receiving surface of the solar cell 130 and the second seal member 140 may be located on the back surface of the solar cell 130. The first seal member 120 and the second seal member 140 Are adhered by lamination to cut off moisture, oxygen, and the like which may adversely affect the solar cell 130. The first sealing material 120 and the second sealing material 140 may be made of an ethylene-vinyl acetate copolymer resin (EVA), polyvinyl butyral, ethylene-vinyl acetate partial oxide, silicon resin, ester- have.

The front substrate 110 is disposed on the first sealing material 120 and is preferably formed of tempered glass in order to protect the solar cell 130 from external impact and transmit sunlight. Further, it is more preferable to use a low-iron-content tempered glass containing a small amount of iron in order to prevent the reflection of sunlight and increase the transmittance of sunlight.

The rear substrate 160 protects the solar cell from the back surface of the solar cell 130 and functions as a waterproof, insulating and ultraviolet shielding function, and may be TPT (Tedlar / PET / Tedlar) type . The rear substrate 160 is preferably made of a material having a high reflectivity so that the sunlight incident from the front substrate 110 can be reflected and reused. However, the rear substrate 160 is formed of a transparent material from which sunlight can be incident, You can also implement modules.

The frame 300 is joined to the peripheral edge portion of the solar cell module 50 to support the solar cell module 50.

4, the frame 300 includes a female engaging portion 310 including an upper engaging portion 312, a lower engaging portion 314, and a connecting engaging portion 316 connecting the upper engaging portion 312 and the lower engaging portion 314, And an L-shaped leg portion 320 extending from the leg portion 316. The female coupling portion 310 forms a rectangular space, and the solar cell module 50 is coupled to the female coupling portion 310, so that the frame 300 supports the solar cell module 50.

Although not shown in the drawings, silicone or the like is applied between the female coupling portion 310 and the solar cell module 50 to absorb external impact, improve bonding force, and prevent foreign matter from penetrating.

The junction box 170 may be positioned on the rear substrate 160 of the solar cell module 50 and may include a bypass diode or the like so that the DC power generated by the solar cell module 50 does not flow backward. Thus, 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.

In the drawing, the first to fourth conductive lines 135a, 135b, 135c, and 135d are extended to the back surface of the solar cell module 50 through the openings formed on the solar cell module 50. FIG. At this time, it is preferable that the junction box 170 is disposed closer to the end of the solar cell module 50 at which the conductive line extends.

2 and 3, since the first to fourth conductive lines 135a, 135b, 135c, and 135d extend from the top of the solar cell module 50 to the back surface of the solar cell module 50, Is located at the upper part of the rear surface of the solar cell module 50. [ Thereby, the length of the conductive line can be reduced, and the power loss can be reduced.

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 back surface of the solar cell module 50, (170) may be positioned below the back surface of the solar cell module (50).

The junction box 170 is connected to the inverter unit 200 by a cable 210 and supplies DC power to the inverter unit 200.

The inverter unit 200 may be located on the rear substrate 160 of the solar cell module 50 and close to the junction box 170 and may include a micro inverter 250, The supplied DC power is converted into AC power.

In addition, the inverter unit 200 includes a fastening hole, and the quickening unit 360 such as a screw is coupled to the fastening hole, so that the inverter unit 200 can be fixed on the rear substrate 160. The fastening hole may be formed on the upper surface of the inverter unit 200, but may be formed on the side surface and fixed to the rear substrate 160, unlike the drawing. However, the structure in which the inverter unit 200 is fixed on the rear substrate 160 is not limited to this, and may have various fastening structures. For example, a guide groove (not shown) may be formed on the rear substrate 160 so that the inverter unit 200 may be slidably coupled to the rear substrate 160.

During the operation of the inverter unit 200, a high temperature is generated from the micro inverter 250 and the like, and the generated heat reduces the efficiency of the specific solar cell 130 arranged at the position where the inverter unit 200 is attached .

In order to prevent this, the frame 300 may include a cover portion 350 in which a part of the leg portion 320 is extended to cover the inverter portion 200. The cover portion 350 may be formed of a metal material such as gold (Au), silver (Ag), copper (Cu), aluminum (Al), tungsten (W) 320, or may be separately manufactured and then fastened to the leg 320. [

When the cover part 350 formed of a material having a high thermal conductivity contacts the upper surface of the inverter part 200 as described above, the heat generated in the inverter part 200 is diverted to the outside through the cover part 350, The efficiency of the specific solar cell 130 in which the solar cell 200 is located can be prevented from being reduced. Meanwhile, the cover unit 350 may be larger than the area of the inverter unit 200, and the inverter unit 200 may be positioned at the center of the cover unit 350 for effective heat transfer.

5, the heat conduction layer 230 may be positioned between the inverter unit 200 and the cover unit 350, as shown in FIG. 5 (B). The thermally conductive layer 230 may be formed by applying a tape or paste formed of a material having a high thermal conductivity to the space between the inverter unit 200 and the cover unit 350 So that more effective heat transfer can be achieved.

Further, a heat insulating layer 220 may be formed between the inverter unit 200 and the solar cell module 50. Therefore, it is possible to more effectively prevent the efficiency of the specific solar cell 130 in which the inverter unit 200 is located from being reduced due to the heat generated in the inverter unit 200.

On the other hand, the heat insulating layer 220 may have the same height as the height of the lower engaging portion 314. Therefore, the inverter unit 200 is positioned so that a part of the inverter unit 200 is in close contact with the frame 300 on the lower engaging part 314, thereby preventing foreign matter or the like from penetrating.

5B shows that the radiating fin 355 may be formed on the outer surface of the cover portion 350. As shown in FIG. When the radiating fin 355 is formed on the outer surface of the cover 350, the area of the cover 350 contacting the outside air is increased to further improve the cooling efficiency.

4 shows that the cover unit 350 and the inverter unit 200 have coupling holes corresponding to each other and the coupling devices 360 such as screws are coupled to the coupling holes so as to be coupled with each other. It does not.

Meanwhile, the junction box 170 also generates high heat from the bypass diodes (Da, Db, Dc, Dd) during operation. Therefore, although not shown in the drawing, the cover part 350 may be formed to cover the junction box 170, and the heat conduction layer 230 and the heat insulating layer 220 may be further provided.

In addition, the junction box 170 and the inverter unit 200 may be coated with a water-repellent coating for protecting internal circuit elements.

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

Referring to the drawings, bypass diodes Da, Db, and Dc may be connected corresponding to 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, and is connected to the first solar cell string 140a or the second solar cell string 140b 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 0.6 V generated in a normal solar cell is generated, the potential of the cathode electrode is approximately 12 V (= 0.6 V * 20), as compared with the potential of the anode electrode of the first bypass diode Da Lt; / RTI > That is, the first bypass diode Da operates normally, not bypass.

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

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

6, it is also possible to connect six bypass diodes corresponding to six solar cell strings, and various other modifications are possible.

7 is an example of an internal circuit diagram of FIG.

7 shows the internal circuit diagram of the junction box 170 and the inverter unit 200. Referring to FIG. 7, the junction box 170 includes a bypass diode unit 270 and a capacitor unit 280 . The inverter unit 200 may include a micro inverter 250 and a control unit 260. The inverter unit 200 may further include a converter unit 290 between the capacitor unit 280 and the microinverter 250.

The bypass diode 270 is connected to the first to fourth conductive lines 135a, 135b, 135c, and 135d disposed between the angles of the a, b, c, And third bypass diodes Da, Db, and Dc.

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

Meanwhile, the junction box 170 may include a control unit (not shown) to perform power optimizing control through a maximum power determination algorithm MPPT. This will be described later with reference to Figs. 8 and 9. Fig.

The micro inverter 250 converts the direct current power into the alternating current power. In the drawing, a full-bridge inverter is illustrated. Namely, the upper and lower arm switching elements Sa and Sb connected in series to each other and the lower arm switching elements S'a and S'b are paired, and two pairs of upper and lower arm switching elements are connected in parallel to each other (Sa & Sb & S'b). Diodes are connected in anti-parallel to each switching element Sa, S'a, Sb, S'b.

Since the solar module 100 according to the present invention is connected in parallel to the power grid (190 in FIG. 1) to supply electric power, the external power supplied to the power grid (190 in FIG. 1) The AC power source to be converted and supplied shall be matched so that the waveform is not damaged by overlapping between AC power sources.

Therefore, the control unit 260 determines whether the output current ic3 sensed by the output current sensing unit E of the microinverter 250 and the output voltage Vc3 sensed by the output voltage sensing unit F match the external power source The operation of the microinverter 250 is controlled. That is, the switching elements in the microinverter 250 are turned on / off based on the inverter switching control signal Sic from the controller 260. As a result, AC power having a predetermined frequency is output.

For example, when the voltage of the external power source flowing into the power grid (190 in FIG. 1) instantaneously increases, the control unit 260 increases the turn-on duty of the switching element in the microinverter 250, The operation of the microinverter 250 can be controlled so that the output current of the microinverter 250 and the level of the output voltage rise.

The inverter unit 200 may further include a converter unit 290 between the capacitor unit 280 and the microinverter 250. The converter unit 290 uses a DC power stored in the capacitor unit 280 And performs level conversion.

In the figure, a flyback converter using the turn-on timing of the switching element S1 and the winding ratio of the transformer T is illustrated. As a result, the level of the DC power supply can be boosted and supplied to the microinverter 250.

The input current sensing unit A senses the current ic1 supplied to the converter unit 290 and the input voltage sensing unit B senses the voltage vc1 input to the converter unit 290 do. The sensed current ic1 and the voltage vc1 are input to the control unit 260. [

The output current sensing unit C senses the current ic2 output from the converter unit 290 and the output voltage sensing unit D senses the voltage vc2 output from the converter unit 290 do. The sensed current ic2 and the voltage vc2 are input to the control unit 260. [

At this time, the controller 260 determines whether the sensed DC currents ic1 and ic2 and DC voltages vc1 and vc2 can be converted to the level to be output from the microinverter 250, and controls the operation of the converter unit 290 .

FIG. 8 illustrates voltage versus current curves of the solar cell module of FIG. 2, and FIG. 9 illustrates voltage versus power curves of the solar cell module of FIG.

Referring to FIG. 8, as the open-circuit voltage Voc supplied from the solar cell module 50 increases, the short current supplied from the solar cell module 50 becomes smaller. According to the voltage-current curve L, the voltage Voc is stored in the capacitor unit 280 provided in the junction box 170.

9, the maximum power Pmpp supplied from the solar cell module 50 can be calculated by a maximum power point tracking algorithm (MPPT). For example, while the open-circuit voltage Voc is decreased 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. Then, the power decreases from the voltage Vmpp to the voltage V2, so that Pmpp corresponding to the voltage Vmpp is determined as the maximum power. Thus, power optimizing control can be performed.

10 is a view showing a connection method between the junction box, the inverter unit and the connection unit of the solar cell module of FIG.

The junction box 170, the inverter unit 200, and the connection unit 180 may be connected by a cable 210. 10, a coupling groove 212 is formed at one end of the cable 210 and a connection terminal 214 is formed at the other end of the cable 210 connected to the coupling groove 212, The connection terminal 214 can be easily detached and attached so that the junction box 170, the inverter unit 200, and the connection unit 180 can be easily connected.

Accordingly, when an abnormality occurs in the junction box 170, the inverter unit 200, or the connection unit 180, only the junction box 170, the inverter unit 200, or the connection unit 180 in which the abnormality has occurred can be easily replaced , The installation of the solar module 100 can be simplified.

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

Referring to FIG. 11, a solar module 400 according to an embodiment of the present invention includes a solar cell module 50, a junction box 170, a microinverter 250, and a controller 260, (200), and a connection (180) that can connect to the power network (190). The monitoring unit 410 may further include a monitoring unit 410 connected to the power network 190 at a location spaced apart from the connection unit 180.

The connection unit 180 is connected to the power grid 190 so that the solar module 100 acting as a new power source is connected in parallel with an external power source that supplies power to the power grid 190. Therefore, since the solar module 100 supplies a part of the power consumed by the ac power source device, it is possible to reduce the consumption of external power that flows into the house.

The connection unit 180 or the inverter unit 200 may include a first communication module (not shown) to communicate with the monitoring unit 410. 7) based on the output current ic3 and the output voltage Vc3 sensed by the output current sensing unit (E in FIG. 7) and the output voltage sensing unit (F in FIG. 7) And transmits the generated power to the monitoring unit 410.

The monitoring unit 410 includes a second communication module and a screen. Accordingly, the monitoring unit 410 receives the amount of power generated by the solar module 100 transmitted by the first communication module located in the connection unit 180 or the inverter unit 200, and displays the received power amount on the screen. The monitoring unit 410 detects external power flowing into the power network 190 and displays it on the screen and is transmitted to the first communication module (not shown) in the connection unit 180 or the inverter unit 200.

The communication between the second communication module of the monitoring unit 410 and the first communication module located in the connection unit 180 or the junction box 170 can be performed by Wi-Fi, short-range communication, power line communication, no.

On the other hand, on the basis of the information about the external power received by the first communication module in the connection unit 180 or the junction box 170, the control unit 260 determines that the AC power converted and supplied from the micro inverter 250 is supplied to the power network 190 And controls the operation of the micro-inverter 250 so as to match with the external power supplied to the micro-inverter 250.

When the monitoring unit 410 is connected to the power network 190 at a position separated from the connection unit 180 as described above, it is possible to display the amount of power on the screen and confirm the same in real time.

Alternatively, the monitoring unit 410 may be formed integrally with the connection unit 180 connected to the power network 190, unlike the drawing.

12 is a configuration diagram of a solar photovoltaic system according to an embodiment of the present invention.

Referring to FIG. 12, the solar photovoltaic system includes a first solar module 100 and a second solar module 100 'connected in parallel, but not limited thereto, and three or more solar modules They may be connected in parallel.

Referring to the drawings, the first solar module 100 includes a first junction box 170 and a first inverter unit 200, and the second solar module 100 'includes a second junction box 170' And a second inverter unit 200 '. At this time, the first inverter unit 200 and the second inverter unit 200 'are connected to each other in parallel, and the second inverter unit 200' is connected to the connection unit 180.

Accordingly, the first inverter unit 200 converts the DC power supplied from the first junction box 170 to AC power and transfers it to the second inverter unit 200 ', and the second inverter unit 200' The AC power supplied from the first junction box 170 'together with the AC power converted from the DC power supplied from the second junction box 170' is supplied to the external power network through the connection unit 180.

Such a solar photovoltaic system can supply more power to the external power network, thereby further reducing the consumption of external power.

It is to be understood that the invention is not to be limited in its application to the details of construction and the manner in which the above described embodiments of the invention are put into practice, .

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

A solar cell module including a front substrate, a rear substrate, and a plurality of solar cells between the front substrate and the rear substrate;
A frame having a coupling portion coupled to the solar cell module;
A junction box which is adhered to the rear substrate, which is a back surface of the solar cell module, and which is connected to a conductive line electrically connected to at least a part of the plurality of solar cells;
An inverter unit located on the rear substrate and converting DC power supplied through the junction box to AC power;
A cable connected between the junction box and the inverter unit for inputting the DC power source to the inverter unit; And
And a connection unit connected to a power network to which external power is supplied and supplying the AC power to the power network,
Wherein the inverter unit is disposed at a corner of the frame and is fixedly coupled to a part of the frame,
Wherein the conductive line extends to the back surface of the solar cell module through an opening formed in the solar cell module,
The junction box includes:
And a bypass diode unit for preventing a backflow of the DC power generated by the solar cell module,
The inverter unit includes:
A converter unit for converting a level of the DC power source from the junction box;
A micro inverter for converting the DC power from the converter into the AC power;
A controller for controlling operations of the converter and the microinverter;
A first current sensing unit and a first voltage sensing unit for sensing a first current and a first voltage input to the converter unit;
A second current sensing unit and a second voltage sensing unit for sensing a second current and a second voltage output from the converter unit;
An output current sensing unit for sensing an output current of the microinverter; And
And an output voltage sensing unit for sensing an output voltage of the microinverter,
Wherein the junction box is located at the center of the rear substrate,
Wherein the inverter section is spaced apart on either side of the junction box and located on the rear substrate and adjacent to at least two sides of a corner of the frame.

The method according to claim 1,
Wherein the control unit controls the operation of the micro-inverter so that the AC power matches the external power flowing into the power grid.

The method according to claim 1,
Wherein,
The first current and the first voltage sensed by the first current sensing unit and the first voltage sensing unit,
And controls the operation of the converter unit based on the second current and the second voltage sensed by the second current sensing unit and the second voltage sensing unit,
Wherein the control unit controls the turn-on duty of the switching element in the micro-inverter to increase as the voltage of the external power supply to the power network increases, based on the output current and the output voltage.

delete

The method according to claim 1,
The junction box further includes a capacitor unit, and is connected to the inverter unit to supply the DC power.

The method according to claim 1,
The coupling portion includes an upper coupling portion, a lower coupling portion, and a coupling coupling portion connecting the upper coupling portion and the lower coupling portion,
Wherein the frame further includes a leg portion extending from the connection coupling portion, and a peripheral edge portion of the solar cell module is coupled to the coupling portion to support the solar cell module.

The method according to claim 6,
Wherein the frame is fastened to the inverter unit by fastening holes and screws.

8. The method of claim 7,
And a thermally conductive layer between the frame and the inverter unit.

The method according to claim 1,
And a heat insulating layer between the inverter section and the rear substrate.

8. The method of claim 7,
And a cover portion extending to the inverter portion in the frame.

The method according to claim 1,
Wherein the inverter unit or the connection unit includes a first communication module,
And a second communication module capable of communicating with the first communication module.

12. The method of claim 11,
Wherein the monitoring unit senses the external power, the second communication module transmits the sensed external power to the first communication module,
Wherein the control unit controls operation of the micro inverter based on the external power received by the first communication module.

13. The method of claim 12,
Wherein the monitoring unit includes a screen, and wherein the screen displays the sensed external power.

14. The method of claim 13,
Wherein the first communication module transmits an amount of power generated in the solar cell module to the second communication module, and the screen displays the amount of power received by the second communication module.

12. The method of claim 11,
Wherein the monitoring unit is connected to the power grid at a location remote from the connection.

12. The method of claim 11,
Wherein the communication between the first communication module and the second communication module is by near field communication or power line communication.

12. The method of claim 11,
Wherein the monitoring unit and the connection unit are integrally formed.

The method according to claim 1,
A plurality of solar cell modules are provided,
Wherein AC power outputted from each inverter corresponding to the plurality of solar cell modules is outputted in series or in parallel with each other by respective cables.

The method according to claim 1,
And a second cable for outputting AC power from the inverter unit to the outside is connected to the connection unit.