KR101889772B1 - Photovoltaic module and photovoltaic system including the same - Google Patents

Photovoltaic module and photovoltaic system including the same Download PDF

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KR101889772B1
KR101889772B1 KR1020160109475A KR20160109475A KR101889772B1 KR 101889772 B1 KR101889772 B1 KR 101889772B1 KR 1020160109475 A KR1020160109475 A KR 1020160109475A KR 20160109475 A KR20160109475 A KR 20160109475A KR 101889772 B1 KR101889772 B1 KR 101889772B1
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South Korea
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power
power output
grid
information
output
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KR1020160109475A
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Korean (ko)
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KR20180023701A (en
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박문호
박영찬
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention relates to a photovoltaic module and a photovoltaic system having the same. A solar photovoltaic system according to an embodiment of the present invention includes a solar module for outputting DC power and an inverter for converting the DC power from the solar module into AC power and outputting the AC power. And a communication section for receiving the grid voltage information and the grid frequency information and selecting any one of the plurality of AC power output sections based on the received grid voltage information and the grid frequency information, And controls to output the AC power corresponding to the information. As a result, it becomes possible to easily output the AC power corresponding to the voltage and frequency of other systems by country or region.

Figure R1020160109475

Description

TECHNICAL FIELD [0001] The present invention relates to a photovoltaic module, and a photovoltaic system having the photovoltaic module and photovoltaic system,

The present invention relates to a photovoltaic module and a photovoltaic system having the photovoltaic module, and more particularly, to a photovoltaic module capable of easily outputting AC power corresponding to voltage and frequency of other systems by country or region, And a solar cell system having the same.

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.

Meanwhile, the photovoltaic module means that the solar cells for solar power generation are connected in series or in parallel.

On the other hand, when the alternating current power is output to the grid based on the photovoltaic module, the alternating current power having different voltage levels and frequencies for each country or region must be supplied to the system.

Manufacturers of photovoltaic modules and photovoltaic systems shall, accordingly, supply the corresponding alternating current power, taking into account the different systems by country or region.

Therefore, it is inconvenient to construct a circuit for supplying AC power corresponding to each country or region.

It is an object of the present invention to provide a solar module capable of simply outputting AC power corresponding to voltage and frequency of other systems by country or region and a solar light system having the same.

According to an aspect of the present invention, there is provided a solar photovoltaic system including a solar module for outputting a DC power source, an inverter unit for converting a DC power source from the solar module into an AC power source, A plurality of ac power output units, and a communication unit for receiving the grid voltage information and the grid frequency information, wherein the control unit selects any one of the plurality of ac power output units based on the received system voltage information and the grid frequency information, And controls to output an AC power corresponding to the grid voltage information and the grid frequency information.

According to another aspect of the present invention, there is provided a solar module including: a solar cell module including a plurality of solar cells; a plurality of AC power sources for converting a DC power source from the solar cell module into an AC power source; And a control unit that selects one of the plurality of AC power output units based on the received grid voltage information and the grid frequency information and outputs the grid voltage information and the grid frequency information And a control unit for controlling to output the AC power corresponding to the AC power.

According to another aspect of the present invention, there is provided a solar photovoltaic system including a grid voltage detector for detecting a grid voltage, a grid frequency detector for detecting a grid frequency, a solar cell having a plurality of solar cells, A plurality of AC power output units for converting DC power from the solar cell module to AC power, a communication unit for receiving the grid voltage information and the grid frequency information, and a plurality of And a control unit for selecting any one of the AC power output units and controlling the AC power supply to output the grid voltage information and the grid frequency information.

A solar photovoltaic system according to an embodiment of the present invention includes a solar module for outputting a DC power source and an inverter unit for converting a DC power source from the solar module into an AC power source and outputting the AC power, And a communication section for receiving the grid voltage information and the grid frequency information, and selects one of the plurality of AC power output sections based on the received grid voltage information and the grid frequency information, By controlling the output of the AC power supply corresponding to the frequency information, it becomes possible to easily output the AC power supply corresponding to the voltage and frequency of the other system by country or region.

On the other hand, when the received system voltage is out of the permissible range, the operation of the selected alternating-current power output unit is stopped, so that the stability of the photovoltaic system can be improved in connection with the system.

On the other hand, by selecting the alternating-current power output section including the transformer having the corresponding capacity and the switching element having the corresponding switching timing in accordance with the grid voltage information and the grid voltage frequency information, the voltage and frequency It is possible to easily output the AC power corresponding to the AC power.

Meanwhile, a solar module according to an embodiment of the present invention includes a solar cell module having a plurality of solar cells, a plurality of AC power output units for converting DC power from the solar cell module into AC power, And a control unit for selecting either one of the plurality of AC power output units based on the received system voltage information and the grid frequency information to generate an AC power supply corresponding to the grid voltage information and the grid frequency information, So that it is possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

According to another aspect of the present invention, there is provided a solar photovoltaic system comprising: a grid voltage detector for detecting a grid voltage; a grid frequency detector for detecting a grid frequency; a solar cell module having a plurality of solar cells; A communication section for receiving the system voltage information and the system frequency information for converting the DC power of the AC power source into an AC power source, a communication section for receiving the system power information and the grid frequency information, And a control unit for selecting one of the plurality of photovoltaic modules and controlling the output of the alternating current power corresponding to the grid voltage information and the grid frequency information so that the alternating current power corresponding to the voltage and frequency of other systems So that it can be outputted simply.

1 is a view showing a conventional solar optical system.
2A is a diagram illustrating a solar light system according to an embodiment of the present invention.
2B is a diagram illustrating a solar light system according to another embodiment of the present invention.
FIG. 3 is a view showing an example of the inside of the inverter unit of FIG.
4A to 4E are diagrams for explaining the operation of the inverter unit of FIG.
5 is a diagram showing an example of a circuit diagram of the inverter unit of FIG. 2A or 2B.
FIG. 6 is a view showing another example of the inside of the inverter unit of FIG.
7A and 7B are diagrams for explaining the operation of the inverter unit of FIG.
FIG. 8 is a flowchart illustrating a method of operating a solar photovoltaic system according to an embodiment of the present invention.
9 is a view showing a solar light system according to another embodiment of the present invention.
FIG. 10 is a view showing an example of the interior of the junction box of FIG. 9. FIG.
11 is a view showing another example of the interior of the junction box of Fig.
12 is a diagram showing an example of a circuit diagram of the junction box of FIG.
13 is a flowchart illustrating an operation method of a solar photovoltaic system according to another embodiment of the present invention.
14A to 14C are diagrams referred to in the description of the operation method of FIG.
15 is a front view of the solar module of Fig. 7;
Fig. 16 is a rear view of the solar module shown in Fig. 15. Fig.
17 is an exploded perspective view of the solar cell module of Fig.

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

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Thus, "module" and "part" may be used interchangeably.

1 is a view showing a conventional solar optical system.

1 (a) includes a solar module 5a for outputting DC power, an inverter 7a for converting the DC power from the solar module 5a to AC power, A grid 9a for receiving AC power outputted from the inverter unit 7a, and a load 8a.

On the other hand, in the United States, the system is single-phase three-wire system, the voltage of the system is 240V (line voltage) / 120V (phase voltage), and the frequency of the system is 60Hz.

Accordingly, the inverter unit 7a should output AC power having a frequency of 240 Hz (line voltage) / 120 V (phase voltage) and a frequency of 60 Hz corresponding to the US system.

Next, Fig. 1 (b) shows an example of a three-phase four-wire system as in Korea where the voltage of the system is 380 V (line voltage) / 220 V (phase voltage) and the frequency of the system is 60 Hz.

Accordingly, the inverter unit 7b must output AC power having a voltage of 380 V (line voltage) / 220 V (phase voltage) and a frequency of 60 Hz corresponding to the Korean system.

1C shows an example of a three-phase four-wire system such as Europe where the voltage of the system is 230V (line voltage) / 220V (phase voltage), and the frequency of the system is 50Hz / 60Hz do.

Accordingly, the inverter section 7c should output an alternating current power having a voltage of 2230 V (line voltage) / 220 V (phase voltage) corresponding to the European system and a frequency of 50 Hz / 60 Hz.

As shown in FIG. 1, when AC power is output to the grids 9a to 9c based on the solar modules 5a to 5c, AC power having different voltage levels and frequencies for each country or region is supplied to the grid .

Accordingly, the manufacturer of the photovoltaic module and the photovoltaic system must supply the corresponding alternating current power in consideration of other systems by country or region, It is inconvenient to construct a circuit.

Accordingly, the present invention provides a solar module capable of simply outputting AC power corresponding to voltage and frequency of other systems by country or region, and a solar light system having the same. This will be described in detail with reference to FIG.

2A is a diagram illustrating a solar light system according to an embodiment of the present invention.

Referring to the drawings, a solar photovoltaic system 10a according to an embodiment of the present invention includes a plurality of solar modules 51a to 51n for outputting a DC power, a plurality of photovoltaic modules 51a to 51n, An inverter unit 58 for converting a power source into an AC power source, a gateway 80 for monitoring AC power output from the inverter unit 58, a grid 90, a load 85, a system voltage detector H, and a systematic frequency detection unit I for detecting the system frequency.

The inverter unit 58 can output the AC voltage Vac and the system voltage Vgd can flow through the system 90. [

On the other hand, in the present invention, the system voltage detection section H and the system frequency detection section I are used in order that the inverter section 58 outputs the AC voltage corresponding to the voltage and the frequency of the system.

The system voltage detection section H can detect the level of the system voltage Vgd. For this purpose, a voltage transformer (VT) or a resistive element and an OP AMP may be provided.

The system frequency detection section (I) can detect the frequency of the system voltage (Vgd). To this end, the system frequency detector I may detect a zero crossing of the system voltage Vgd, and may include a timer or the like for comparing zero crossing times.

On the other hand, the system voltage information Inv detected by the system voltage detector H and the system frequency information Inf detected by the system frequency detector I can be input to the gateway 80, respectively.

The gateway 80 receives the grid voltage information Inv and the grid frequency information Inf from the grid voltage detector H and the grid frequency detector I respectively and supplies the grid voltage information Inv and grid frequency information Inf to the inverter unit 32, (PLC) or the like to the inverter unit 58.

The communication unit 580 in the inverter unit 58 can receive the system voltage information Inv and the grid frequency information Inf from the gateway 80. [

The inverter unit 58 may include a plurality of ac power output units (59a in Fig. 3) and a communication unit 580 for receiving the grid voltage information and the grid frequency information. ... based on the received system voltage information Inv and the grid frequency information Inf so that the system voltage information Inv and the grid frequency information Inf Inf) can be output. Thus, it becomes possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

For example, when the received system voltage information (Inv) and the systematic frequency information (Inf) are 380 / 220V and 60Hz in Korea as a three-phase four-wire system, the inverter unit (58) (For example, 59a in FIG. 3A) is selected, and AC power having a system voltage and a system frequency of 380 / 220V and 60Hz can be output through the selected AC power output section.

As another example, when the received system voltage information (Inv) and the grid frequency information (Inf) are 400 / 230V and 50Hz in Germany as a three-phase four-wire system, the inverter unit (58) It is possible to select the corresponding AC power output section (for example, 59b in FIG. 3A) and output the AC power having the system voltage and the system frequency of 400 / 230V and 50Hz through the selected AC power output section.

As another example, when the received system voltage information (Inv) and the grid frequency information (Inf) are 380 / 220V and 50Hz in China as a three-phase four-wire system, the inverter unit (58) (For example, 59c in FIG. 3A) is selected, and AC power having a system voltage and a system frequency of 380 / 220V and 50Hz can be output through the selected AC power output section.

As another example, when the received system voltage information (Inv) and the grid frequency information Inf are 346 / 200V and 50 Hz in the three-phase four-wire system and the inductors 58 and 58, (For example, 59d in FIG. 3A) is selected, and AC power having a system voltage and a system frequency of 346 / 200V and 50Hz can be output through the selected AC power output section.

As another example, when the received system voltage information (Inv) and the systematic frequency information (Inf) are the three-phase four-wire system and the Philippines is 400/230 V and 60 Hz, the inverter unit 58 outputs (For example, 59e in FIG. 3A) is selected and an AC power source having a system voltage and a system frequency of 400 / 230V and 60Hz can be output through the selected AC power output unit.

In this manner, the inverter 58 has a plurality of AC power output sections, and selects an AC power output section corresponding to the voltage level and frequency of the system power supply and outputs AC power corresponding to the system, The AC power supply corresponding to the voltage and frequency of the other system can be easily output.

On the other hand, the inverter 58 can stop the operation of the selected AC power output unit when the received system voltage is out of the allowable range. That is, AC power may not be output. Thus, in conjunction with the system, the stability of the solar cell system 10a can be improved.

On the other hand, the gateway 80 and the load 85 can exchange data by wire or wireless communication.

For example, the load 85 can transmit the power consumption information of the load to the gateway 80. [

On the other hand, the gateway 80 can receive information on the alternating current Igd from the power switching unit 95.

On the other hand, the gateway 80 can receive information (Infot) about the output current Iac from the inverter unit 58 or a separate current detection unit (not shown).

This allows the gateway 80 to calculate the load power consumption based on the alternating current Igd flowing into the grid 90 and the output current Iac of the inverter unit 58. [

The gateway 80 can transmit the calculated power consumption information to the inverter unit 58. [

2B is a diagram illustrating a solar light system according to another embodiment of the present invention.

2B is similar to the solar photovoltaic system 10a of FIG. 2A, except that the grid voltage information Inv from the grid voltage detector H, the grid frequency detector I, And the system frequency information Inf are transmitted to the inverter unit 58 directly without passing through the gateway 80. [

The communication unit 580 in the inverter unit 58 can immediately receive the system voltage information Inv and the grid frequency information Inf from the system voltage detection unit H and the system frequency detection unit I. [

FIG. 3 is a view showing an example of the inside of the inverter unit of FIG.

Referring to the drawing, the inverter unit 58a of FIG. 3 can output a three-phase four-wire AC power source.

To this end, the inverter unit 58a of FIG. 3 may include first to fifth AC power output units 59a to 59e, a communication unit 580a, and a control unit 550a.

The communication unit 580a can receive the grid voltage information Inv and the grid frequency information Inf from the grid voltage detection unit H and the grid frequency detection unit I or from the gateway 80, (550a).

The control unit 550a receives the system voltage information Inv and the grid frequency information Inf and selects any one of the first to fifth AC power output units 59a to 59e based on this information.

The first to fifth AC power output units 59a to 59e are capable of outputting three-phase four-wire AC power and have circuits for outputting different voltage levels or different frequencies for each country .

For example, as shown in FIG. 5, the first to fifth AC power output sections 59a to 59e include a transformer, a switching element connected to one end of the transformer, and converters 530a to 530e ).

Each of the transformers in the first to fifth AC power output units 59a to 59e may have different capacities, for example, inductance, depending on the level of the AC power to be output.

The switching timings of the switching elements in the first to fifth AC power output units 59a to 59e may be set to correspond to 50 Hz or 60 Hz in accordance with the frequency of the AC power to be output.

The control unit 550a can select the alternating current power output unit including the transformer having the corresponding capacity and the switching element having the switching timing according to the system voltage information Inv and the grid frequency information Inf.

4A to 4E are diagrams for explaining the operation of the inverter unit of FIG.

For example, when the received system voltage information Inv and the grid frequency information Inf are 380 / 220V and 60Hz in Korea as a three-phase four-wire system, the control unit 550a in the inverter unit 58a calculates 4A, the first AC power output unit 59a is selected, and AC power having the system voltage and the system frequency of 380 / 220V and 60Hz can be output through the selected AC power output unit.

As another example, when the received system voltage information Inv and the grid frequency information Inf are 400 / 230V and 50Hz in Germany as a three-phase four-wire system, the control unit 550a in the inverter unit 58a calculates It is possible to select the second AC power output section 59b and output the AC power having the system voltage and the system frequency of 400 / 230V and 50Hz through the selected AC power output section.

As another example, when the received system voltage information Inv and the systematic frequency information Inf are 380 / 220V and 50 Hz in the three-phase four-wire system and are in China, the control unit 550a in the inverter unit 58a, 4c, the third AC power output unit 59c is selected, and AC power having the system voltage and the system frequency of 380 / 220V and 50Hz can be output through the selected AC power output unit.

As another example, when the received system voltage information Inv and the systematic frequency information Inf are 346 / 200V and 50 Hz in the three-phase four-wire system, the control unit 550a in the inverter unit 58a calculates 4d, the fourth AC power supply output section 59d is selected, and AC power having the system voltage and the system frequency of 346 / 200V and 50Hz can be output through the selected AC power output section.

As another example, when the received system voltage information Inv and the systematic frequency information Inf are 400 / 230V and 60Hz in the Philippines as a three-phase four-wire system, the control unit 550a in the inverter unit 58a The fifth AC power output unit 59e can be selected and the AC power having the system voltage and the system frequency of 400 / 230V and 60Hz can be outputted through the selected AC power output unit as shown in FIG.

In this manner, the inverter unit 58a includes a plurality of AC power output units, selects an AC power output unit corresponding to the voltage level and frequency of the system power supply, and outputs AC power corresponding to the system, It is possible to easily output AC power corresponding to voltage and frequency of other systems.

5 is a diagram showing an example of a circuit diagram of the inverter unit of FIG. 2A or 2B.

Referring to the drawings, the inverter unit 58 can convert the DC power from each of the solar modules 51a to 51n and output the converted AC power.

Specifically, the inverter unit 58 can convert the DC power from each of the solar modules 51a to 51n and output the converted AC power.

Accordingly, each of the solar modules 51a to 51n may have a junction box (not shown) on its rear surface, and a bypass diode (not shown) for bypassing may be provided in a junction box have.

 The DC power input to the inverter unit 58 may be a DC power source through a bypass diode unit (not shown).

The inverter unit 58 may include a converter 530a, an inverter 540a, a control unit 550a for controlling the inverter 540a, and a communication unit 580a.

In addition, the inverter unit 58 may further include a capacitor unit 520a for DC power storage.

The inverter unit 58 includes an input current sensing unit A, an input voltage sensing unit B, a converter output current detection unit C, a converter output voltage detection unit D, an inverter output current detection unit E, And an output voltage detecting unit (F).

On the other hand, the control unit 550a can control the converter 530a and the inverter 540a.

On the other hand, the control unit 550a controls the converter 530a to perform DC conversion.

On the other hand, the control unit 550a controls the inverter 540a to perform AC conversion.

A DC power source through the bypass diode unit (not shown) in the junction box (not shown) of each of the solar modules 51a to 51n may be input to the capacitor unit 520a in the inverter unit 58. [

The capacitor unit 520a may store an input DC power input through the solar cell module 100 and the bypass diode unit (not shown).

In the figure, the capacitor unit 520a includes a plurality of capacitors Ca, Cb, and Cc connected in parallel to each other. Alternatively, a plurality of capacitors may be connected in series- It is also possible to connect to the terminal. Alternatively, it is also possible that the capacitor portion 520a includes only one capacitor.

The converter 530a can convert the level of the DC power source through the capacitor portion 520a.

In particular, the converter 530a can perform power conversion using the DC power stored in the capacitor unit 520a.

For example, the converter 530a may include a plurality of resistive elements, or a transformer, and may perform voltage distribution with respect to the input voltage based on the set target power.

In the figure, an example of the converter 530a is a tap inductor converter, but otherwise, a flyback converter, a buck converter, a boost converter, and the like are possible.

The converter 530a, that is, the tap inductor converter shown in the figure has a tap inductor T, a switching element S1 connected between the tap inductor T and the ground terminal, and a switching element S1 connected to the output terminal of the tap inductor, And may include a diode D1 for performing the operation.

On the other hand, a dc short capacitor (not shown) may be connected between the output terminal of the diode D1, that is, between the cathode and the ground terminal.

Specifically, the switching element S1 can be connected between the taps of the tap inductor T and the ground terminal. The output terminal (secondary side) of the tap inductor T is connected to the anode of the diode D1 and the dc-side capacitor C1 is connected between the cathode of the diode D1 and the ground terminal .

On the other hand, the primary side and the secondary side of the tap inductor T have opposite polarities. On the other hand, the tap inductor T may be referred to as a switching transformer.

On the other hand, the switching element S1 in the converter 530a can be turned on / off based on the converter switching control signal from the controller 550a. Thereby, the level-converted DC power can be outputted.

The inverter 540a can convert the DC power converted by the converter 530a into the AC 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 may be connected in anti-parallel to each switching element Sa, S'a, Sb, S'b.

The switching elements Sa, S'a, Sb and S'b in the inverter 540a can be turned on / off based on the inverter switching control signal from the control section 550a. As a result, an AC power source having a predetermined frequency can be output. Preferably, it has a frequency (approximately 60 Hz or 50 Hz) that is equal to the alternating frequency of the grid.

On the other hand, the capacitor C may be disposed between the converter 530a and the inverter 540a.

The capacitor C may store the level-converted DC power of the converter 530a. On the other hand, both ends of the capacitor C may be referred to as a dc stage, and accordingly, the capacitor C may be called a dc-stage capacitor.

Meanwhile, the input current sensing unit A may sense an input current ic1 supplied from the solar cell module 100 to the capacitor unit 520a.

The input voltage sensing unit B may sense the input voltage Vc1 supplied from the solar cell module 100 to the capacitor unit 520a. Here, the input voltage Vc1 may be equal to the voltage stored across the capacitor portion 520a.

The sensed input current ic1 and the input voltage vc1 may be input to the control unit 550a.

The converter output current detector C senses the output current ic2 output from the converter 530a, that is, the dc-step current. The converter output voltage detector D detects the output current ic2 output from the converter 530a, (vc2), i.e., the dc voltage. The sensed output current ic2 and the output voltage vc2 may be input to the control unit 550a.

The inverter output current detector E detects the current ic3 output from the inverter 540a and the inverter output voltage detector F detects the voltage vc3 output from the inverter 540a. The detected current ic3 and the voltage vc3 are input to the control unit 550a.

On the other hand, the control unit 550a can output a control signal for controlling the switching element S1 of the converter 530a. In particular, the control unit 550a may control at least one of the detected input current ic1, the input voltage vc1, the output current ic2, the output voltage vc2, the output current ic3, or the output voltage vc3 , It is possible to output the turn-on timing signal of the switching element S1 in the converter 530a.

On the other hand, the control unit 550a can output an inverter control signal for controlling each switching element Sa, S'a, Sb, S'b of the inverter 540a. In particular, the control unit 550a may control at least one of the detected input current ic1, the input voltage vc1, the output current ic2, the output voltage vc2, the output current ic3, or the output voltage vc3 On timing signals of the respective switching elements Sa, S'a, Sb and S'b of the inverter 540a can be outputted on the basis of these signals.

On the other hand, the control unit 550a can control the converter 530a to calculate the maximum power point for the solar cell module 100 and accordingly output the DC power corresponding to the maximum power.

Meanwhile, the converter 530a and the inverter 540a may be provided in the first AC power output unit 59a.

The inverter unit 58 may include a plurality of AC power output units 59a to 59e and each of the AC power output units 59a to 59e may include a converter and an inverter can do.

Alternatively, each of the AC power output sections 59a to 59e may include a converter, and the inverter 540a may be a common inverter.

The communication unit 580a can exchange data with the gateway 80. [ For example, the communication unit 580a can perform power line communication (PLC) with the gateway 80. [

For example, the communication unit 580a can transmit the power information of the inverter unit 58 to the gateway 80. [ In particular, the output current information, output voltage information, and the like of the inverter unit 58 can be transmitted.

On the other hand, the communication unit 580a can receive the system voltage information (Inv) and the grid frequency information (Inf) from the grid voltage detector (H), the grid frequency detector (I)

On the other hand, the control unit 550a selects any one of the plurality of AC power output units 59a, ... based on the received system voltage information Inv and the grid frequency information Inf, It is possible to control to output the alternating current power corresponding to the power source Inv and the grid frequency information Inf. Thus, it becomes possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

On the other hand, when the received system voltage is out of the permissible range, the control unit 550a can control to stop the operation of the selected AC power output unit.

On the other hand, when the received system voltage information (Inv) and the grid frequency information (Inf) are in a three-phase four-wire system, the controller 550a can control to output an AC power corresponding to a three-phase four-wire system.

On the other hand, when the received system voltage information (Inv) and the grid frequency information (Inf) are in a single-phase three-wire system, the control unit 550a can control to output an alternating-current power corresponding to the single-

On the other hand, the control unit 550a can select the alternating-current power output unit including the transformer having the corresponding capacity and the switching element having the switching timing according to the system voltage information Inv and the grid frequency information Inf .

FIG. 6 is a view showing another example of the inside of the inverter unit of FIG.

Referring to the drawings, the inverter unit 58b of FIG. 6 can output AC power of single-phase three-wire system.

To this end, the inverter unit 58b of FIG. 6 may include first and second AC power output units 59x to 59y, a communication unit 580b, and a control unit 550b.

The communication unit 580b can receive the grid voltage information Inv and the grid frequency information Inf from the grid voltage detection unit H and the grid frequency detection unit I or from the gateway 80, (550b).

The control unit 550b receives the system voltage information Inv and the grid frequency information Inf and selects any one of the first and second AC power output units 59x to 59y on the basis thereof.

The first and second AC power output units 59x to 59y are capable of outputting AC power in a single-phase three-wire system and have circuits for outputting different voltage levels or different frequencies for respective countries .

For example, the first and second AC power output sections 59x to 59y may include a transformer, a switching element connected to one end of the transformer, and a converter having a diode element, as shown in Fig. 5 have.

Each transformer in the first to second AC power output units 59x to 59y may have different capacities, for example, inductance, depending on the level of the AC power to be output.

The switching timing of the switching elements in the first and second AC power output units 59x to 59y may be set to a switching timing corresponding to 50 Hz or 60 Hz corresponding to the frequency of the AC power to be output.

The control unit 550b can select the alternating current power output unit including the transformer having the corresponding capacity and the switching device having the switching timing according to the system voltage information Inv and the grid frequency information Inf.

7A and 7B are diagrams for explaining the operation of the inverter unit of FIG.

For example, when the received system voltage information Inv and the systematic frequency information Inf are 240/120 V and 60 Hz in the United States or Japan, as the single-phase three-wire system, the control unit 550b in the inverter unit 58b May select the first AC power output unit 59x and output an AC power having the system voltage and the system frequency of 240 / 120V and 60Hz through the selected AC power output unit as shown in FIG. 7A.

As another example, when the received system voltage information Inv and the grid frequency information Inf are 240/120 V and 50 Hz in the Kanto region of Japan as a three-phase four-wire system, the control unit 550b in the inverter unit 58b, As shown in FIG. 7B, the second AC power output unit 59y may be selected, and AC power having a system voltage and a system frequency of 240 / 120V and 50Hz may be output through the selected AC power output unit.

FIG. 8 is a flowchart illustrating a method of operating a solar photovoltaic system according to an embodiment of the present invention.

Hereinafter, the inverter unit 58a of FIG. 3 will be described as a reference.

First, the system voltage detection section H detects the level of the system voltage Vgd (S810), and the system frequency detection section I can detect the frequency of the system voltage Vgd (S820).

The system voltage information Inv detected by the system voltage detector H and the system frequency information Inf detected by the system frequency detector I are input to the inverter unit 58a via the gateway 80, Or may be directly input to the inverter unit 58a without going through the gateway 80. [

The control unit 550a in the inverter unit 58a controls the plurality of AC power output units 59a to 59n based on the grid voltage information Inv and the grid frequency information Inf that are received through the communication unit 580a. Is selected (S830).

Next, the selected AC power output section outputs AC power corresponding to the grid voltage information Inv and the grid frequency information Inf (S840).

As shown in Figs. 4A to 4E, the control unit 550a in the inverter unit 58a can control to output the alternating current power corresponding to the alternating current power level and the frequency corresponding to each station. Thus, it becomes possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

9 is a view showing a solar light system according to another embodiment of the present invention.

Referring to the drawings, a photovoltaic system 20a according to another embodiment of the present invention includes a plurality of photovoltaic modules 50a to 50n for outputting an ac power, a plurality of photovoltaic modules 50a to 50n, A grid 80 for monitoring the power supply, a grid 90 and a load 85, a grid voltage detector H for detecting the grid voltage, and a grid frequency detector I for detecting the grid frequency .

Each of the photovoltaic modules 50a to 50n may include junction boxes 200a to 200n on the rear surface thereof and the junction boxes 200a to 200n may include a bypass diode 510, A converter 520, a converter 530, an inverter 540, and the like.

In particular, with respect to the present invention, each of the junction boxes 200a to 200n may include a plurality of AC power output sections (61a to 61e in FIG. 12).

The plurality of solar modules 50a to 50n can respectively output AC power to the outside through the cables 31a to 31n. Then, each AC power source can be supplied to the grid 90 via the cable oln.

On the other hand, the plurality of solar modules 50a to 50n can perform power line communication with the gateway 80 through the cables 32a to 32n for power line communication.

On the other hand, the gateway 80 and the load 85 can exchange data by wire or wireless communication.

The plurality of solar modules 50a to 50n can detect the output current Iac output from the plurality of solar modules 50a to 50n by using the output current detection unit E of Fig.

Alternatively, the gateway 80 may include a separate output current detection unit (not shown) and may detect the output current Iac output from the plurality of solar modules 50a to 50n. Thus, the gateway 80 can acquire information Infot on the output current Iac.

Each of the plurality of solar modules 50a to 50n can output DC power to the outside through a cable.

The plurality of solar modules 50a to 50n can convert the input DC power into AC power and supply the AC power to the grid 90 or the load 85 through the cable.

On the other hand, the plurality of solar modules 50a to 50n can perform power line communication with the gateway 80 through the cable 32 for power line communication.

On the other hand, the gateway 80 and the load 85 can exchange data by wire or wireless communication.

For example, the load 85 can transmit the power consumption information of the load to the gateway 80. [

On the other hand, the system voltage information Inv detected by the system voltage detector H and the system frequency information Inf detected by the system frequency detector I can be input to the gateway 80, respectively.

The gateway 80 receives the grid voltage information Inv and the grid frequency information Inf from the grid voltage detector H and the grid frequency detector I respectively and supplies the grid voltage information Inv and grid frequency information Inf to the inverter unit 32, (PLC) or the like to each of the solar modules 50a to 50n.

The communication unit 580 in each of the solar modules 50a to 50n can receive the grid voltage information Inv and the grid frequency information Inf from the gateway 80. [

Each of the solar modules 50a to 50n includes a plurality of AC power output units (61a in Fig. 10), a communication unit 580 that receives grid voltage information and grid frequency information, ... based on the received system voltage information Inv and the grid frequency information Inf so that the system voltage information Inv and the grid frequency information Inf And a control unit 550 for controlling to output AC power corresponding to the AC power. Thus, it becomes possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

For example, when the received system voltage information Inv and the grid frequency information Inf are 380 / 220V and 60Hz in Korea as a three-phase four-wire system, the controller 550 in each of the solar modules 50a to 50n (For example, 61a in FIG. 10A), and can output an AC power having a system voltage and a system frequency of 380 / 220V and 60Hz through the selected AC power output section .

As another example, when the received system voltage information Inv and the grid frequency information Inf are 400 / 230V and 50Hz in Germany as a three-phase four-wire system, the control unit 550 in each of the solar modules 50a to 50n, (For example, 61b in FIG. 10A) and outputs AC power having a system voltage and a system frequency of 400 / 230V and 50Hz through the selected AC power output unit.

As another example, when the received system voltage information (Inv) and the grid frequency information (Inf) are 380 / 220V and 50Hz in China as a three-phase four-wire system, the inverter unit (58) The control unit 550 in the power supply units 50a to 50n selects the corresponding AC power output unit (for example, 61c in FIG. 10A) and outputs the AC power having the grid voltage and the system frequency of 380 / 220V and 50Hz AC power can be output.

As another example, when the received system voltage information Inv and the grid frequency information Inf are 346 / 200V and 50 Hz in the three-phase four-wire system, the control unit 550 in each of the solar modules 50a to 50n (For example, 61d in FIG. 10A), and can output an AC power having a system voltage and a system frequency of 346/200 V and 50 Hz through the selected AC power output section .

As another example, when the received system voltage information (Inv) and the grid frequency information (Inf) are in the three-phase four-wire system and the Philippines is at 400 / 230V and 60Hz, the inverter unit (58) The control unit 550 in the power supply units 50a to 50n selects the corresponding AC power supply output unit (for example, 61e in FIG. 10A) and supplies the AC power supply with the grid voltages of 400 / 230V and 60Hz and the grid frequency AC power can be output.

As described above, each of the photovoltaic modules 50a to 50n includes a plurality of alternating-current power output sections, selects an alternating-current power output section corresponding to the voltage level and frequency of the system power supply, and outputs an alternating- , It becomes possible to easily output AC power corresponding to the voltage and frequency of other systems by country or region.

On the other hand, the control unit 550 in each of the solar modules 50a to 50n can stop the operation of the selected AC power output unit when the received system voltage is out of the allowable range. That is, AC power may not be output. Thus, in conjunction with the system, the stability of the solar cell system 20a can be improved.

FIG. 10 is a view showing an example of the interior of the junction box of FIG. 9. FIG.

Referring to FIG. 3, the junction box 200a of FIG. 3 can output a three-phase four-wire AC power source.

To this end, the junction box 200a of FIG. 3 may include first to fifth AC power output units 61a to 61e, a communication unit 580a, and a control unit 550a.

The communication unit 580a can receive the grid voltage information Inv and the grid frequency information Inf from the grid voltage detection unit H and the grid frequency detection unit I or from the gateway 80, (550a).

The control unit 550a receives the system voltage information Inv and the grid frequency information Inf and selects any one of the first to fifth AC power output units 61a to 61e based thereon.

The first to fifth AC power output units 61a to 61e are capable of outputting three-phase, four-phase AC power, and each circuit has a circuit for outputting different voltage levels or different frequencies .

For example, as shown in Fig. 5, the first to fifth AC power supply output sections 61a to 61e include a transformer, a switching element connected to one end of the transformer, and converters 530a to 530e ).

Each of the transformers in the first to fifth AC power output sections 61a to 61e may have different capacities, for example, inductance, depending on the level of the AC power to be output.

The switching timing of the switching elements in the first to fifth AC power output sections 61a to 61e may be set to a switching timing corresponding to 50 Hz or 60 Hz corresponding to the frequency of the AC power to be output.

The control unit 550a can select the alternating current power output unit including the transformer having the corresponding capacity and the switching element having the switching timing according to the system voltage information Inv and the grid frequency information Inf.

11 is a view showing another example of the interior of the junction box of Fig.

Referring to the drawing, the junction box 200b of FIG. 6 can output AC power of a single-phase three-wire system.

To this end, the junction box 200b of FIG. 6 may include first to second AC power output units 61x to 61y, a communication unit 580b, and a control unit 550b.

The communication unit 580b can receive the grid voltage information Inv and the grid frequency information Inf from the grid voltage detection unit H and the grid frequency detection unit I or from the gateway 80, (550b).

The control unit 550b receives the system voltage information Inv and the grid frequency information Inf and can select any one of the first and second AC power output units 61x to 61y.

The first and second AC power output units 61x to 61y are capable of outputting AC power in a single-phase three-wire system and have a circuit for outputting different voltage levels or different frequencies for each country .

For example, the first and second AC power output sections 61x to 61y may include a transformer, a switching element connected to one end of the transformer, and a converter having a diode element, as shown in Fig. 5 have.

Each transformer in the first to second AC power output sections 61x to 61y may have different capacities, for example, inductance, depending on the level of the AC power to be output.

The switching timing of the switching elements in the first to second AC power output sections 61x to 61y may be set to a switching timing corresponding to 50 Hz or 60 Hz corresponding to the frequency of the AC power to be output.

The control unit 550b can select the alternating current power output unit including the transformer having the corresponding capacity and the switching device having the switching timing according to the system voltage information Inv and the grid frequency information Inf.

12 is a diagram showing an example of a circuit diagram of the junction box of FIG.

Referring to the drawings, the junction box 200 can convert DC power from the solar cell module 100 and output the converted power.

Particularly, in connection with the present invention, the junction box 200 can output AC power.

The junction box 200 may include a converter unit 530, an inverter unit 540, a control unit 550 for controlling the inverter unit 540, and a communication unit 580.

The junction box 200 may further include a bypass diode 510 for bypassing and a capacitor 520 for DC power storage.

The junction box 200 includes an input current sensing unit A, an input voltage sensing unit B, a converter output current detection unit C, a converter output voltage detection unit D, an inverter output current detection unit E, And an output voltage detecting unit (F).

On the other hand, the control unit 550 can control the converter unit 530 and the inverter unit 540.

The bypass diode unit 510 includes bypass diodes Dc, Db, Da disposed between the first to fourth conductive lines 135a, 135b, 135c, and 135d of the solar cell module 100, . At this time, it is preferable that the number of the bypass diodes is one or more and smaller than the number of the conductive lines by one.

The bypass diodes Dc, Db and Da are connected to the first to fourth conductive lines 135a, 135b, 135c and 135d in the solar cell module 100, Power is input. The bypass diodes Dc, Db, and Da can be bypassed when a reverse voltage is generated from a DC power source from at least one of the first through fourth conductive lines 135a, 135b, 135c, and 135d have.

On the other hand, the DC power source through the bypass diode 510 can be input to the capacitor 520.

The capacitor unit 520 may store an input DC power input through the solar cell module 100 and the bypass diode unit 510. [

The operations of the converter unit 530, the inverter unit 540, the control unit 550 for controlling the same, and the communication unit 580 in the drawing are similar to those of the respective units in Fig. 5, and a description thereof will be omitted .

On the other hand, the communication unit 580 can receive the system voltage information Inv and the grid frequency information Inf from the system voltage detection unit H, the system frequency detection unit I or the gateway 80. [

On the other hand, the control unit 550 selects any one of the plurality of AC power output units 59a, ... based on the received system voltage information Inv and the grid frequency information Inf, It is possible to control to output the alternating current power corresponding to the power source Inv and the grid frequency information Inf. Thus, it becomes possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

On the other hand, when the received system voltage is out of the allowable range, the control unit 550 can control to stop the operation of the selected AC power output unit.

On the other hand, when the received system voltage information (Inv) and the grid frequency information (Inf) are in the three-phase four-wire system, the controller 550 can control to output the AC power corresponding to the three-phase four-wire system.

On the other hand, when the received system voltage information (Inv) and the grid frequency information (Inf) are in a single-phase three-wire system, the control unit 550 can control to output an AC power corresponding to the single-

On the other hand, the control unit 550 can select the alternating-current power output unit including the transformer having the corresponding capacity and the switching element having the switching timing according to the system voltage information Inv and the grid frequency information Inf .

FIG. 13 is a flowchart illustrating an operation method of a solar photovoltaic system according to another embodiment of the present invention, and FIGS. 14A to 14C are diagrams referred to in the description of the operation method of FIG.

First, the control unit 550 can control to output the first AC power supply Vgda from the first AC power output unit 61a among the plurality of AC power output units 61a to 61e in the first period (S1305).

Here, the first AC power output unit 61a can output the first AC power Vgda having 380 / 220V and 60Hz.

14A illustrates that the first AC power supply Vgda is output from the first AC power output section 61a and supplied to the system 90c.

On the other hand, the system 90c may be a system of China having 380 / 220V and 50Hz as described above.

The control unit 550 can receive the system voltage information (Inv) and the grid frequency information (Inf) through the communication unit (580).

The control unit 550 then determines whether the received system voltage information Inv and the grid frequency information Inf are within the allowable range Vcan (S1310).

On the other hand, when the received system voltage information Inv and the grid frequency information Inf are within the allowable range Vcan in step 1310 (S1310), the control unit 550 controls the first AC power output unit 61a The first AC power supply Vgda from the first AC power source Vgda (S1313).

On the other hand, since the frequency is different between the first AC power supply Vgda and the system 90c, the voltage Vgda of the system 90c deviates from the allowable range Vcan as shown in FIG. 14A.

If the received system voltage information Inv and the grid frequency information Inf are out of the allowable range Vcan, the control unit 550 controls the plurality of AC power output units 61a to 61e in the second period, The second AC power supply Vgdb from the second AC power output unit 61b can be controlled to be output (S1315).

Here, the second AC power output section 61b can output the second AC power supply Vgdb having 400 / 230V and 50Hz.

Fig. 14B illustrates that the second alternating-current power supply Vgdb is output from the second alternating-current power output section 61b and supplied to the system 90c.

On the other hand, the system 90c may be a system of China having 380 / 220V and 50Hz as described above.

The control unit 550 can receive the system voltage information (Inv) and the grid frequency information (Inf) through the communication unit (580).

Then, the control unit 550 determines whether the received system voltage information Inv and the grid frequency information Inf are within the allowable range Vcan (S1320).

On the other hand, if the received system voltage information Inv and the grid frequency information Inf are within the allowable range Vcan in step 1320 (S1320), the control unit 550 controls the second AC power output unit 61b The second AC power source Vgdb from the second AC power source (step S1323).

On the other hand, since the voltage is different between the second AC power supply Vgdb and the system 90c, the voltage Vgdb of the system 90c deviates from the allowable range Vcan as shown in Fig. 14B.

When the received system voltage information Inv and the grid frequency information Inf are out of the allowable range Vcan, the control unit 550 controls the plurality of AC power output units 61a to 61e in the third period, The third AC power source Vgdc from the third AC power source output unit 61c can be controlled to be output (S1325).

Here, the third AC power supply output section 61c can output the third AC power supply Vgdc having 380 / 220V and 50Hz.

Fig. 14C illustrates that the third alternating-current power supply Vgda is output from the third alternating-current power output section 61c and supplied to the system 90c.

On the other hand, the system 90c may be a system of China having 380 / 220V and 50Hz as described above.

The control unit 550 can receive the system voltage information (Inv) and the grid frequency information (Inf) through the communication unit (580).

Then, the control unit 550 determines whether the received system voltage information Inv and the grid frequency information Inf are within the allowable range Vcan (S1330).

On the other hand, if the received system voltage information Inv and the grid frequency information Inf are within the allowable range Vcan in step 1330 (S1330), the control unit 550 controls the third AC power output unit 61c (Vgdc) from the first AC power source (S1335).

In this manner, the control unit 550 sequentially activates the plurality of alternating-current power output units 61a to 61e to sequentially output the alternating-current power from each of the alternating-current power output units 61a to 61e, When the information Inv and the grid frequency information Inf are within the allowable range Vcan, the corresponding AC power output unit can be selected. As a result, it becomes possible to easily output the AC power corresponding to the voltage and frequency of other systems by country or region.

13 to 14C can be applied to the solar photovoltaic system of Figs. 2A to 2B in addition to the solar photovoltaic system having the solar photovoltaic module for outputting the ac power of Fig.

2A or 2B, the inverter unit 58a of the first AC power output unit 59a of the plurality of AC power output units 59a to 59e in the first period When the received system voltage information Inv and the grid frequency information Inf are out of the allowable range Vcan, the first AC power supply unit 59a The system voltage information Inv and the systematic frequency information Inf are outputted from the second AC power output section 59b of the first to fifth power supply sections 59a to 59e out of the allowable range Vcan The third alternating-current power supply Vgdc from the third alternating-current power output portion 59c of the plurality of alternating-current power output portions 59a to 59e is outputted in the third period, and the received system voltage information Inv and The third alternating-current power source Vgdc from the third alternating-current power output unit 59c can be continuously outputted when the systematic frequency information Inf is within the allowable range Vcan.

That is, the inverter unit 58a of FIG. 2A or 2B sequentially activates the plurality of AC power output units 59a to 59e to sequentially output the AC power from the AC power output units 59a to 59e , And when the received system voltage information (Inv) and the systematic frequency information (Inf) are within the allowable range (Vcan), the corresponding AC power output unit can be selected. Thus, it becomes possible to easily output AC power corresponding to voltage and frequency of other systems by country or region.

FIG. 15 is a front view of the solar module of FIG. 7, and FIG. 16 is a rear view of the solar module of FIG.

Referring to the drawings, a solar module 50 according to an embodiment of the present invention may include a solar cell module 100 and a junction box 200 located on the back surface of the solar cell module 100.

The junction box 200 may include at least one bypass diode that is bypassed to prevent hot spots in the case of shadow generation or the like.

On the other hand, Fig. 12 and the like illustrate that three bypass diodes (Da, Db, and Dc in Fig. 12) are provided corresponding to the four solar battery strings in Fig.

On the other hand, the junction box 200 can convert DC power supplied from the solar cell module 100. 12 and the following.

On the other hand, the solar cell module 100 may include a plurality of solar cells.

In the figure, a plurality of fish cells are connected in series by ribbons (133 in FIG. 17) to form a solar cell string 140. By this, 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.

On the other hand, each solar cell string can be electrically connected by a bus ribbon. 15 is a sectional view of the solar cell module in which the first solar cell string 140a and the second solar cell string 140b are connected by the bus ribbons 145a, 145c, 145e disposed under the solar cell module 100, 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.

15 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 100, And 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 through fourth conductive lines 135a, 135b, 135c, and 135d, respectively The first to fourth conductive lines 135a, 135b, 135c and 135d are connected to bypass diodes (Da, Db and Dc in Fig. 12) in the junction box 200 arranged on the back surface of the solar cell module 100, Respectively. In the drawing, the first through fourth conductive lines 135a, 135b, 135c, and 135d extend through the openings formed on the solar cell module 100 to the back surface of the solar cell module 100. FIG.

It is preferable that the junction box 200 is disposed closer to an end of the solar cell module 100 where the conductive lines extend.

17 is an exploded perspective view of the solar cell module of Fig.

Referring to FIG. 17, the solar cell module 100 of FIG. 15 may include a plurality of solar cells 130. The first sealing material 120 and the second sealing material 150 located on the lower surface and the upper surface of the plurality of solar cells 130 and the rear substrate 110 and the second sealing material 120 located on the lower surfaces of the first sealing material 120, And may further include a front substrate 160 positioned on the top surface of the sealing member 150.

The solar cell 130 is a semiconductor device that converts solar energy into electrical energy. The solar cell 130 may be a silicon solar cell, a compound semiconductor solar cell, a tandem solar cell, Dye-sensitized or CdTe, CIGS type solar cells, thin film solar cells, and the like.

The solar cell 130 is formed of a light receiving surface on which solar light 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.

Each solar cell 130 may be electrically connected in series, parallel, or series-parallel. Specifically, a plurality of solar cells 130 can be electrically connected by a ribbon 133. [ The ribbon 133 may be bonded to the front electrode formed on the light receiving surface of the solar cell 130 and the rear electrode collecting electrode formed on the rear surface of another adjacent solar cell 130. [

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.

15, six strings 140a, 140b, 140c, 140d, 140e and 140f are formed, and each string may include ten solar cells.

The back substrate 110 may be, but is not limited to, a TPT (Tedlar / PET / Tedlar) type having a waterproof, insulating and ultraviolet shielding function as a back sheet. In FIG. 12, the rear substrate 110 is shown as a rectangular shape. However, the rear substrate 110 may be formed in various shapes such as a circular shape and a semicircular shape according to the environment in which the solar cell module 100 is installed.

The first sealing member 120 may be attached to the rear substrate 110 to have the same size as the rear substrate 110 and a plurality of solar cells 130 may be formed on the first sealing member 120 And can be positioned adjacent to each other so as to achieve the same.

The second sealing member 150 may be positioned on the solar cell 130 and may be laminated to the first sealing member 120.

Here, the first sealant 120 and the second sealant 150 allow each element of the solar cell to chemically bond. The first sealing material 120 and the second sealing material 150 can be various examples such as an ethylene vinyl acetate (EVA) film.

On the other hand, the front substrate 160 is preferably placed on the second sealing material 150 so as to transmit sunlight, and is preferably made of tempered glass in order to protect the solar cell 130 from an external impact or the like. 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 solar cell module and the solar cell system having the solar cell module according to the present invention are not limited to the configuration and method of the embodiments described above but the embodiments can be applied to all or a part of each embodiment Some of which may be selectively combined.

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 (19)

A solar module for outputting DC power;
An inverter unit for converting a DC power from the solar module into an AC power and outputting the AC power;
A system voltage detector for detecting a system voltage;
A system frequency detector for detecting a system frequency;
And a gateway for monitoring the output of the inverter unit,
The inverter unit includes:
A plurality of AC power output sections;
A communication unit for receiving the grid voltage information and the grid frequency information;
And a controller for selecting any one of the plurality of AC power output units based on the received system voltage information and grid frequency information,
And selects one of the plurality of AC power output units based on the received grid voltage information and grid frequency information to output AC power corresponding to the grid voltage information and grid frequency information,
The gateway receives the grid voltage information and the grid frequency information from the grid voltage detector and the grid frequency detector, respectively,
Wherein the communication unit receives the system voltage information and the grid frequency information from the gateway,
The inverter unit includes:
And sequentially activates the plurality of AC power output units to sequentially output AC power from each AC power output unit. When the received system voltage information and the grid frequency information are within an allowable range, the corresponding AC power output Select department,
The inverter unit includes:
When the system voltage based on the received system voltage information is out of the allowable range, the operation of the selected AC power output unit is stopped
Wherein each of the plurality of AC power output sections in the inverter section includes:
Comprising transformers of different capacities,
Wherein each of the plurality of AC power output sections in the inverter section includes:
And a converter including the switching device and the transformer,
Wherein,
And an alternating-current power output unit having a transformer of a corresponding capacity and a switching element having a switching timing corresponding thereto, in accordance with the grid voltage information and the grid voltage frequency information. delete delete delete delete delete The method according to claim 1,
Wherein each of the plurality of AC power output portions includes:
And outputs AC power corresponding to the three-phase four-wire system. The method according to claim 1,
Wherein each of the plurality of AC power output portions includes:
And outputs AC power corresponding to the single-phase three-wire system. delete The method according to claim 1,
The inverter unit includes:
The first AC power supply unit outputs the first AC power from the first AC power output unit among the plurality of AC power output units in the first period, and when the received systematic voltage information and the grid frequency information are out of the allowable range, And outputs the second AC power from the second AC power output unit among the plurality of AC power output units. When the received systematic voltage information and the systematic frequency information are out of the allowable range, in the third period, And the third AC power from the third AC power output unit among the plurality of AC power output units is output. When the received system voltage information and the grid frequency information are within the allowable range, 3 < / RTI > AC power supply. A solar cell module comprising a plurality of solar cells;
A plurality of AC power output units converting DC power from the solar cell module to different voltages or frequencies;
A communication unit for receiving the grid voltage information and the grid frequency information;
And a control unit for selecting any one of the plurality of AC power output units based on the received grid voltage information and grid frequency information and outputting AC power corresponding to the grid voltage information and the grid frequency information In addition,
Wherein,
Receiving the grid voltage information and grid frequency information from a gateway,
Wherein,
A first AC power output unit of the plurality of AC power output units is selected to control the first AC power to be output to the system,
When the system voltage information and the grid frequency information received from the system are within the permissible range after the first AC power output, the first AC power from the first AC power output unit is continuously outputted ,
When the system voltage information and the grid frequency information received from the system after the first AC power output are out of the allowable range, the second AC power output unit of the plurality of AC power output units is selected, Controls the AC power source to be output to the system,
When the system voltage information and the systematic frequency information received from the system after the second AC power output are within the allowable range, the second AC power from the second AC power output unit is continuously outputted and,
When the system voltage information and the grid frequency information received from the system after the second AC power output are out of the allowable range, an AC power from an AC power output unit of any one of the plurality of AC power output units Until the grid voltage information and the grid frequency information received in the grid are within the allowable range,
Wherein each of the plurality of AC power output portions includes:
A converter including a switching element and a transformer,
Wherein,
Wherein the alternating current power supply unit selects a transformer having a capacitance corresponding to the grid voltage information and the grid voltage frequency information and a switching element having a switching timing corresponding thereto. delete delete 12. The method of claim 11,
Wherein each of the plurality of AC power output portions includes:
And outputs AC power corresponding to the three-phase four-wire system. 12. The method of claim 11,
Wherein each of the plurality of AC power output portions includes:
And outputs AC power corresponding to the single-phase three-wire system. delete 12. The method of claim 11,
Wherein,
The control unit controls to output the first AC power from the first AC power output unit among the plurality of AC power output units in the first period and, when the received systematic voltage information and the grid frequency information are out of the allowable range, The second AC power from the second AC power output unit among the plurality of AC power output units is output in the second period, and when the received system voltage information and the grid frequency information are out of the allowable range, The third AC power supply from the third AC power output section among the plurality of AC power output sections is controlled to output the third AC power from the third AC power output section when the received grid voltage information and the grid frequency information are within the allowable range, And to continuously output the third alternating-current power from the power-source output unit. A system voltage detector for detecting a system voltage;
A system frequency detector for detecting a system frequency;
The solar photovoltaic system according to any one of claims 11, 14, 15, and 17. 19. The method of claim 18,
And a gateway for monitoring an output of the solar module,
The gateway receives the grid voltage information and the grid frequency information from the grid voltage detector and the grid frequency detector, respectively,
Wherein the communication unit in the photovoltaic module receives the grid voltage information and the grid frequency information from the gateway.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4405654B2 (en) * 2000-09-29 2010-01-27 キヤノン株式会社 Power converter and power generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4405654B2 (en) * 2000-09-29 2010-01-27 キヤノン株式会社 Power converter and power generator

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