KR102046820B1 - Power distribution apparatus based on generation voltage of solar-cell power generating system - Google Patents

Abstract

The present invention relates to a power distribution apparatus based on a generation voltage of a power generating system using a solar cell, to minimize the occurrence of fire or malfunction in an inverter. According to the present invention, the power distribution apparatus based on a generation voltage of a power generating system using a solar cell comprises: a voltage detection unit checking the voltage of direct current (DC) power supplied from a plurality of solar cell panel modules; and a plurality of conversion modules receiving the DC power supplied from the solar cell panel module through a power input terminal to produce and transmit transformed DC or alternating current (AC) power to different load parts, which consume the power, through a power output terminal.

Description

POWER DISTRIBUTION APPARATUS BASED ON GENERATION VOLTAGE OF SOLAR-CELL POWER GENERATING SYSTEM}

The present invention relates to a technology for power distribution of a power generation system using solar cells such as solar heat or solar light, specifically, by efficiently distributing power according to a power generation voltage that varies according to the intensity of sunlight or solar heat during power generation. The present invention relates to a technology for improving power efficiency and minimizing the occurrence of fire or shutdown of an inverter under a solar cell power generation system by distributing power usage at low and high voltages in an optimal environment.

Recently, heating or power generation systems using solar heat or solar light have been greatly activated in terms of eco-friendly energy harvesting technology and resource saving. Install panel modules that can generate electricity using solar light or solar heat in buildings exposed to the outside, on unused flats or in forests, and use the power generated from them or charge them in batteries, In this case, electricity is sold by transmitting electricity.

In this way, by minimizing the consumption of electricity produced from the power plant, by transmitting and selling surplus power to the power plant, by offsetting the electricity bill to save the electricity bill, it is a great help in electrical energy consumption and reproduction. For this reason, even in rural or urban areas, it can be confirmed that recently installed in a power generation system using solar cells, such as solar light or solar heat, and manages the power by applying a smart grid system.

The power generation system using such a solar cell can vary greatly in the amount of sunlight and solar heat available depending on the weather, and the voltage of the power produced in real time or at regular intervals can vary according to the specification of the solar cell. In addition, the DC power produced in the solar cell has a problem that must be converted to AC power in use.

Accordingly, an inverter including a DC / DC or DC / AC converter and a voltage lift device is recognized as an essential device in a power generation system using a solar cell. In particular, in the power generation system using a solar cell, in order to control the charging of the rechargeable battery according to the use of the used power, the use of the production power, and the transmission of the surplus power, the conversion conditions are different according to the corresponding conditions, not just an inverter. The development of a hybrid inverter (Hybrid Inverter) has been required.

Accordingly, the existing hybrid inverter as shown in FIG. 1 is currently used. Referring to FIG. 1, the conventional hybrid inverter 1 is connected to a panel module 100 including a plurality of solar cells and receives a direct current power generated using sunlight or solar heat from the panel module 100. According to a specific condition, it is connected to the hybrid inverter 1 to operate by using electrical energy to perform a function by supplying power to the load 2 as a power consumption source to perform a specific function, or to charge the battery 3 Powers the rechargeable battery 3 so that the load 2 receives power from the rechargeable battery 3 when sufficient power is not generated from the panel module 100 according to the environment thereafter, or In this case, the electric power is supplied to the power transmission line 5 of the KEPCO through the meter 4 so as to sell the electric power.

In this case, the existing hybrid inverter 1 as shown in FIG. 1 performs power transmission lines such as the load 2 and the meter 4 as described above, when the amount of light is sufficient, when the amount of light is sufficient. 5) to control the supply. Meanwhile, during the day, when the power generation from the panel module 100 is not sufficient or when a power failure occurs, the rechargeable battery 3 controls to supply additional power to the load 2.

In addition, when the charge amount of the rechargeable battery 3 is insufficient during the day, it is controlled to charge the rechargeable battery 3 by supplying electric power to the rechargeable battery 3, or at the time of power failure at night, from the rechargeable battery 3 to the load 2. Control to supply. On the other hand, when the charge amount of the rechargeable battery 3 is insufficient at night, it is controlled to charge the rechargeable battery 3 by receiving a cheap midnight power from the power transmission line 5 through the meter (4).

This function has the effect of saving power consumption, but the following problems occur. First, in the case of the conventional hybrid inverter 1, the range of the voltage which can be processed is determined singularly. For example, in a typical inverter, the processable voltage is set at 220V to 400V as a commercial voltage range. For this reason, when the voltage of the DC power supply supplied according to the amount of power produced according to the amount of light in the panel module 100 is 220V or less, the inverter 1 must boost it and provide it to the load 2 or the like, in which case the power efficiency This problem is reduced by about 20%. On the other hand, when it is more than 400V, a problem occurs due to the range of the rated voltage error with the power transmission line 5 and the operating voltage of the load 2 when providing it to the load (2) or power transmission line (5), According to the voltage range limitation of the inverter 1 according to the above, when a voltage of 400V or more is applied to the inverter 1 with a DC power supply, the operation of the inverter 1 is terminated, and after stepping down, the inverter 1 is restarted. Since the inverter 1 must be rebooted for a predetermined time (about 1 to 7 minutes) in order to operate, power during the corresponding time is interrupted to produce a problem that the efficiency of the power generation system is greatly reduced.

Accordingly, the present invention provides a technology capable of power distribution for an inverter of a new concept for distributing power to be suitable for a battery, a load, and a power transmission system, regardless of the range of voltage produced according to the amount of light from the panel module 100. The purpose of the present invention is to provide a technology for maximizing power efficiency while minimizing power consumption.

In addition, as the inverter is stopped and rebooted according to the voltage, the lifespan of each device is prevented from being shortened or power generation is stopped, thereby greatly improving the maintainability of the power generation system using the solar cell and improving the efficiency of using the power generation system itself. There is another purpose to maximize.

In order to achieve the above object, the power distribution device according to the power generation voltage of the power generation system using a solar cell according to an embodiment of the present invention, from a plurality of panel modules for generating power by converting sunlight or solar heat into electrical energy A voltage sensing unit checking a voltage of a supplied DC power supply; Comprising a plurality of conversion module for receiving the direct current power supplied from the panel module through the power input terminal to produce a transformed direct current or alternating current power to transmit to different loads that consume power through the power output terminal, each The conversion module is divided into a low voltage stage type conversion module of a first range, a medium voltage end type conversion module of a second range, and a high voltage end type conversion module of a third range, which are set in descending order of the voltage applied to the power input terminal. A power converter including a plurality of conversion modules; And receiving DC power supplied from the panel module and applying power to each of the power input terminals of the conversion module included in the power converter, wherein the power is supplied to the low voltage terminal and the medium voltage terminal according to the voltage checked by the voltage sensing unit. And a voltage adjusting unit configured to divide power into power stages of a high voltage stage and control power transmission to apply power to a conversion module of a type corresponding to the divided power stages among the three types of conversion modules.

The low voltage stage type conversion module includes a first converter which is a boost or step-down DC / DC converter having a plurality of rechargeable batteries connected to a power output stage, and the maximum threshold voltage of the low voltage stage is used to prevent overcharge. Preferably, the reference voltage is set according to the connection state of the rechargeable battery and the capacity of each battery.

The first range of the low voltage terminal is preferably 0V to 150V.

The medium voltage stage type conversion module may include a second converter which is a DC / DC converter connected to any one of a plurality of rechargeable batteries, a plurality of loads for power use, and a power transmission system for transmitting power generated by KEPCO at a power output stage; It is configured to include at least one of the third converter, which is a DC / AC converter, wherein the second range of the medium voltage terminal is preferably 150V to 400V.

The medium voltage stage type conversion module includes a first switching unit, and by the first switching unit, a charging mode for the rechargeable battery automatically according to the charging amount of the rechargeable battery, the amount of power used in the plurality of loads, It is preferable to operate in any one of a power supply mode for the plurality of loads and a power transmission mode for the power transmission system to the KEPCO.

In the conversion module of the medium voltage stage type, the second converter is operated in the charging mode, and the third converter is controlled by the first switching unit to be operated in the power supply mode and the power transmission mode.

The high voltage stage type conversion module may include: a fourth converter which is a DC / AC converter connected to a power transmission system for transmitting electric power produced by KEPCO to a power output terminal; A meter connected to the fourth transducer; And a power transmission line connected to the meter for transmitting power to the power transmission system, thereby transmitting power to the power transmission line through the meter, and the amount of power transmitted by the power being transmitted is measured by the meter. It is preferably configured to reflect the meter.

The high voltage stage type conversion module further includes a fifth converter, which is an AC / DC converter connected to the meter separately from the power transmission line, such that surplus power other than the transmitted power is applied to the fifth converter. Preferably, the DC power controlled by the second switching unit included in the meter is configured to be connected to the rechargeable battery so that the surplus power is used to charge the rechargeable battery.

The third range of the high voltage terminal is preferably 400V or more and less than or equal to a maximum voltage of the DC power supplied from the plurality of panel modules.

The voltage adjusting unit may include an input terminal configured to receive a checked voltage value generated by the voltage sensing unit as an input signal, and identify one of the power terminals of the low voltage terminal, the medium voltage terminal, and the high voltage terminal according to the voltage value. A control module including an output terminal for outputting an identification signal as an output signal; And a third switching unit which is a switching circuit which receives an output terminal of the control module as a control signal and applies DC power supplied from the panel module to any one of the plurality of conversion modules according to the received control signal. It is desirable to.

According to the present invention, a range of all voltages that the DC power generated by the panel module 100 can have is provided with a conversion module capable of processing a low voltage terminal and a high voltage terminal based on a general medium voltage terminal, respectively. Through this, the low voltage terminal, the middle voltage terminal and the high voltage terminal are controlled to supply power to the use targets having optimum efficiency in the voltage range of each other.

Through this, in order to supply power to a specific object of use, the voltage is boosted to a predetermined voltage using a single inverter, and then the power is supplied to the object of use, thereby inefficiently consuming power or interrupting operation according to the specifications of the inverter. This has the effect of minimizing this phenomenon.

In addition, as a problem described above, according to the single processable voltage range of the inverter, the inverter is stopped and rebooted at a high voltage stage, the inverter may fail, the possibility of shortening the life, and power generation itself may be interrupted. Since the phenomenon can be minimized, maintenance and lifespan of the inverter can be greatly improved in the power generation system using the solar cell.

1 is a view for schematically illustrating the structure of a conventional hybrid inverter system.
2 is a schematic structural diagram of a power distribution device according to a power generation voltage of a power generation system using a solar cell according to an embodiment of the present invention.
3 is a schematic structural diagram for explaining in detail the configuration of the power converter of the present invention.
4 is a schematic structural diagram for explaining in detail the configuration of the voltage adjusting unit of the present invention.
5 is a schematic diagram for visually explaining the function performance of the power distribution device according to the power generation voltage of the power generation system using the solar cell according to an embodiment of the present invention.
6 is a schematic flowchart illustrating a functional flow of a power distribution device according to a power generation voltage of a power generation system using a solar cell according to an embodiment of the present invention.

In the following, various embodiments and / or aspects are now disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. However, it will also be appreciated by one of ordinary skill in the art that this aspect (s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. However, these aspects are exemplary and some of the various methods in the principles of the various aspects may be used and the descriptions described are intended to include all such aspects and their equivalents.

As used herein, “an embodiment”, “an example”, “aspect”, “an example”, and the like, may not be construed that any aspect or design described is better or advantageous than other aspects or designs. .

In addition, the terms "comprises" and / or "comprising" mean that such features and / or components are present, but exclude the presence or addition of one or more other features, components, and / or groups thereof. It should be understood that it does not.

In addition, terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein including technical or scientific terms are generally understood by those skilled in the art to which the present invention belongs. It has the same meaning. Terms such as those defined in the commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related art, and ideally or excessively formal meanings are not defined clearly in the embodiments of the present invention. Not interpreted as

In addition, in the drawings of the accompanying drawings of the present invention to illustrate the technical features of the present invention, the illustration and description thereof for some components of a general device / configuration / device, etc. applied in the same technical field as the present invention May be omitted. In addition, for the same purpose, although the city for some components may be enlarged or excessively highlighted, or the city may be reduced or omitted, it will be obvious that such matters do not limit the scope of the present invention.

In addition, in the detailed description of the present invention, it will be apparent that one or more drawings may be described with reference to the drawings for the understanding of each description.

1 is a view for schematically illustrating the structure of a conventional hybrid inverter system, FIG. 2 is a schematic structural diagram of a power distribution device according to a power generation voltage of a power generation system using a solar cell according to an embodiment of the present invention. 3 is a schematic structural diagram for explaining in detail the configuration of the power converter of the present invention, Figure 4 is a schematic structural diagram for explaining the configuration of the voltage adjusting unit of the present invention in detail, Figure 5 is an embodiment of the present invention Figure 6 is a schematic diagram for visually explaining the function of the power distribution device according to the power generation voltage of the power generation system using a solar cell, Figure 6 is the power according to the power generation voltage of a power generation system using a solar cell according to an embodiment of the present invention A schematic flowchart for explaining the functional flow of the distribution device.

In the following description, since the description of FIG. 1 has already been described in the description of the existing hybrid inverter for the background art described above, it will be omitted in order to avoid unnecessary description.

2 to 6, the power distribution device 10 according to the power generation voltage of the power generation system using the solar cell according to an embodiment of the present invention, the voltage sensing unit 11, the power converter 12 and It characterized in that it comprises a voltage adjusting section (13).

The voltage detector 11 checks the voltage of the DC power supplied from the plurality of panel modules 100 generating power by converting sunlight or solar heat into electrical energy.

In order to perform the above-described function, the voltage sensing unit 11 transmits DC power connected between the voltage adjusting unit 13 and the panel module 100 configured to perform the characteristic functions of the present invention, in addition to the function of the hybrid inverter. It may be configured to include one or more voltage sensors connected to the power supply line (d1) for. The output value of the voltage sensing unit 11 is preferably a voltage value of the DC power produced by the panel module 100 described above and flowing toward the voltage adjusting unit 13.

The power converter 12 receives a plurality of direct-current power supplied from the panel module 100 through a power input terminal to produce transformed direct current or alternating current power and transmits power to different load units that consume power through the power output terminal. The conversion module includes a conversion module, wherein each conversion module includes a conversion module of a low voltage stage type of a first range, a conversion module of a medium voltage stage type of a second range, and a third range of a predetermined range, in order of low voltage applied to a power input terminal. It means a configuration including a plurality of conversion module divided into a high voltage stage type conversion module.

The voltage adjusting unit 12 described above controls the power transmission to selectively apply power to the low voltage stage type conversion module, the medium voltage end type conversion module, and the high voltage end type conversion module included in the power conversion unit 12. to be. That is, the voltage adjusting unit 12 divides the electric power into the low voltage terminal, the middle voltage terminal, and the high voltage terminal power terminal according to the voltage checked from the voltage sensing unit 11, that is, the output value of the voltage sensing unit 11. It performs a function of controlling the power transmission to apply power to the conversion module of the type corresponding to the divided power stage of the type conversion module.

An example of the specific configuration of such a voltage adjusting section 13 is shown in FIG. Referring to FIG. 4, the voltage adjusting unit 13 preferably includes the control module 131 and the third switching unit 132.

The control module 131 receives an input terminal for receiving the checked voltage value generated by the voltage sensing unit 11 as an input signal, and any one of the power terminals of the low voltage terminal, the medium voltage terminal, and the high voltage terminal according to the voltage value. It is a structure including the output stage which sends out the identification signal to identify as an output signal.

That is, the control module 131 performs a function of transmitting a control signal to the third switching unit 132, and the control signal transmitted by the control module 131 is transmitted to the voltage sensing unit 11 as described above. It is generated based on the signal generated by, specifically means a DC voltage value of the power line (d1).

The control module 131 receives the DC voltage value as an input value, and then determines whether the voltage value corresponds to a voltage range of the power terminal of the low voltage terminal, the medium voltage terminal, and the high voltage terminal described above. Therefore, after indicating one power stage, an identification signal capable of indicating this is transmitted as an output signal.

The third switching unit 132 connects the power converter 12 and the power line d1 to the power converter 12 to generate power generated by the panel module 100 flowing through the power line d1. It means a configuration including a kind of relay circuit for controlling to transmit to any one of the plurality of conversion modules included.

The third switching unit 132 receives the output terminal of the above-described control module 131 as a control signal, that is, receives the identification signal indicating any one of the above-described power stage, and according to the identification signal included in the control signal The switching circuit is configured to apply the DC power supplied from the panel module 100 to any one of a plurality of conversion modules.

2 again, any one of the low voltage terminal, the medium voltage terminal, and the high voltage terminal is supplied with the power of each power stage and applied to any one of the plurality of load units by the voltage adjusting unit 13 described above. Corresponding to a plurality of conversion modules, the plurality of conversion modules perform functions in a configuration included in the power conversion unit 12. An example of a detailed configuration of a plurality of conversion modules included in the power converter 12 is illustrated in FIG. 3.

Referring to FIG. 3, the power converter 12 may include a low voltage end type conversion module 121, a medium voltage end type conversion module 122, and a high voltage end type conversion module 123. Each conversion module 121 according to the voltage value of the DC voltage selectively generated from the DC power generated from the panel module 100 by the third switching unit 132 included in the voltage adjusting unit 13 as described above The power is supplied to each of the rods connected to each of the conversion modules 121, 122, and 123 so as to perform a function of each rod. In addition, each conversion module (121, 122, 123) will be described as including a configuration for performing the characteristic function of the present invention, in addition to the configuration for performing the characteristic function of the present invention, in general to convert the power to the load Description of the well-known configuration for performing the function of the inverter to be applied will be understood that the description is omitted in order to omit the description of unnecessary known techniques.

First, the low voltage conversion type conversion module 121 means a configuration in which a plurality of rechargeable batteries 20 are connected to a power output terminal. That is, the electric power transmitted from the low voltage stage type conversion module 121 is supplied to the rechargeable battery 20. In order to supply power to the rechargeable battery 20, as illustrated in FIG. 3, the low voltage stage type conversion module 121 charges the DC power produced by the panel module 100 (hereinafter referred to as “generated power”). It characterized in that it comprises a first converter which is a step-up or step-down DC / DC converter (DC / DC converter) for boosting or stepping down to meet the charging rated voltage of the battery 20.

In the following description, a DC / DC converter refers to a kind of converter that converts a voltage of a DC power source into a DC power source, and a DC / AC converter or an AC / DC converter converts a voltage while converting DC or AC into AC or DC. It will be understood that it means a kind of negotiating inverter to step up or step down.

The low voltage stage type conversion module 121 including the above-described first converter should supply power to meet the charging rated voltage of the rechargeable battery 20. For this purpose, the maximum threshold voltage of the low voltage stage is used to prevent overcharge. Preferably, the reference voltage is set according to the connection state (serial or parallel) of the plurality of rechargeable batteries and the capacity (charge capacity and rated voltage) of each battery, and the lowest threshold voltage is preferably 0V according to the characteristics of the low voltage terminal. . For example, according to a specification of a power generation system using a general solar cell, the first range described above as a voltage range of the low voltage terminal type conversion module 121 may be set to, for example, 0V to 150V.

Meanwhile, the medium voltage terminal type conversion module 122 includes a plurality of rechargeable batteries 20, a plurality of loads 30 for electric power use, and a power transmission system 40 for transmitting electric power produced by KEPCO. And at least one of a second converter 1221 which is a DC / DC converter connected to any one, and a third converter 1222 which is a DC / AC converter.

That is, the medium voltage stage type conversion module 122 is configured to perform a function similar to that of the conventional hybrid inverter described above. For example, the rated voltage of a general inverter, for example, the range of 150V to 400V, is the medium voltage stage type conversion module 122. ) May be set to the aforementioned second range.

That is, the medium voltage stage type conversion module 122 may be configured to be included in any one of all the load units, that is, the rechargeable battery 20, the plurality of loads 30, and the power transmission system 40.

In the present invention, the power transmission system 40 may include a meter 1232 and a power transmission line 1234, which will be described later, and the meter 1232 and the power transmission line of the high voltage stage type conversion module 123 described later. It will be described as included in (1234), but this is a description to help the understanding of the functions and features of the present invention by including some components in the configuration for performing the essential functions for performing the functions of the present invention. That is, since the power transmission system 40 will perform the function of transmitting power generated by KEPCO as described above, it is preferable that the transmission system 40 includes a meter 1232 and a power transmission line 1234 to be described later.

That is, the medium voltage stage type conversion module 122 is connected to the power transmission system 40 when the power generated by the voltage adjusting unit 13 is connected to the medium voltage stage type conversion module 122. It is to be understood that when operating in the power transmission mode in which power is transmitted in accordance with the function of 122, it is connected to the meter 1232 and functions to perform power transmission.

In the present invention, the plurality of loads 30 means a device using a plurality of electrical energy that substantially consumes the above-described generated power source. That is, it will be understood as a concept including all devices operated by receiving electric energy from a consumer of an advanced power source such as a water heater, a heater, a heater, an imaging device, and the like.

As described above, since the medium voltage terminal type conversion module 122 is operated by being connected to the rechargeable battery 20, the load 30, and the power transmission system 40, the first switching unit 1223 may be additionally included. Can be. In this case, the first switching unit 1223 applies the converted power to each of the rechargeable battery 20, the load 30, and the power transmission system 40 to perform the functions of the conventional hybrid inverter mentioned in the description of FIG. 1. It can be understood to mean a kind of control module for performing a function to control the thing.

That is, the first switching unit 1223 is a kind of computer device. For the power application control according to the above-described selection of the power application target, the first switching unit 1223 may be configured for scenarios or control conditions according to time, environment, user input, etc. for switching power application. Setting information may be stored.

By the first switching unit 1223, the medium voltage terminal type conversion module 122 charges the charge amount of the rechargeable battery 20, the amount of power used in the plurality of loads 30, and the above-described time, environment, and user input. According to the setting information on the scenario or the control conditions according to any one of the charging mode for the rechargeable battery 20, the power supply mode for a plurality of loads 30 and the power transmission mode for the power transmission system 40 to KEPCO It is desirable to work.

For example, as described above, when the amount of light is sufficient, the power generated from the panel module 100 is supplied to the power transmission system 40 including the load 30 and the meter 1232 and the power transmission line 1234 as described above. On the other hand, when the power generation from the panel module 100 is not sufficient during the day or when a power failure occurs, the rechargeable battery 20 may be controlled to additionally supply power to the load 30.

In addition, when the amount of charge of the rechargeable battery 20 is insufficient during the day, the electric power is supplied to the rechargeable battery 20 to control the charging of the rechargeable battery 20, or the power is charged from the rechargeable battery 20 to the load 30 at night power failure. It can be controlled to supply. Meanwhile, when the charge amount of the rechargeable battery 20 is insufficient at night, the controller 12 reversely controls the function of the power transmission system 40 according to the power transmission line 1234 through the meter 1232. Can be controlled to charge.

In order to transfer the generated power according to the performance of this function to the load unit using each power type by DC or AC, for example, the medium voltage stage type conversion module 122, the second converter 1221 is in the charge mode. In operation, the third converter 1222 may be controlled to be connected to the power line d1 by the first switching unit 1223 to operate in the power supply mode and the power transmission mode.

Meanwhile, as described above, the high voltage stage type conversion module 123 is preferably connected to the power transmission system 40 to perform a function of transmitting power to KEPCO. At this time. According to the transmission protocol of the power transmission system 40 of the KEPCO, the high voltage stage type conversion module 123 boosts the voltage of the high voltage range, that is, the third range, that is applied so as to be the rated standard range of the power transmission system 40 of KEPCO. You can coerce.

Including the above-described function, as illustrated in FIG. 3, the high voltage stage type conversion module 123 may include a fourth converter 1231, a meter 1232, and a power transmission line 1234.

The fourth converter 1231 is a DC / AC converter connected to the power transmission system 40 for transmitting electric power produced by the KEPCO to the power output terminal, and includes a voltage step-up or step-down function as described above.

As described above, the meter 1232 may be included in the power transmission system 40 when performing the function of the conversion module 122 of the medium voltage terminal type, and when included in the conversion module 123 of the high voltage terminal type, As described above, the electric power is transmitted to the power transmission line 1234 through the meter 1232, and the electric power transmitted is measured by the meter 1232 so that the amount of electric power transmitted is reflected in the meter 1232. The power transmission line 1234 is connected to the meter 1232 to substantially transmit power to the power transmission system 40 means a configuration for transmitting power to the KEPCO.

Meanwhile, as illustrated in FIG. 3, the high voltage stage type conversion module 123 further includes a fifth converter 1235 and the meter 1232 includes the second switching unit 1233 or the meter 1232. A second switching unit 1233 may be further included as a configuration included in the high voltage terminal type conversion module 123 separately from the meter 1232 between the and fourth converter 1231.

The fifth converter 1235 is an AC / DC converter, and when the surplus power other than the transmitted electric power is present, the second switching unit 1233 included in the meter 1232 so that the surplus power is applied to the fifth converter 1235. Controlled by As a result, the DC power converted by the fifth converter 1235 is configured to be connected to the rechargeable battery 20 so that the surplus power is used to charge the rechargeable battery 20. To this end, in the characteristics of the high voltage stage type conversion module 123, power is distributed in a voltage distribution type, so that power corresponding to the rated voltage for power transmission is controlled to be transmitted to the power transmission system 40 by performing the above-described functions. The remaining surplus power will be stepped up or down by the fifth converter 1235 to be charged to the charging battery 20 so as to be within the charging voltage range of the charging battery 20.

In the above-described third range, which is the range of the power stage of the high voltage stage, the maximum value of the DC power supplied from the plurality of panel modules 100 is the highest value, for example, 400 V is the lowest value in consideration of the relationship with the second range. For example, the maximum voltage of 400 V to the above can be set in the range. At this time, the maximum voltage may be set to, for example, 800V.

This function performance can be understood through, for example, FIGS. 5 and 6. First, referring to FIG. 5, power generated from the plurality of panel modules 100 may be divided into a low voltage terminal, a middle voltage terminal, and a high voltage terminal as described above according to a voltage supplied by the panel module 100.

According to the conventional hybrid inverter mentioned in the description of FIG. 1, a range of processable voltages is defined as a single unit. For example, in the case of a general inverter, a processable voltage is set to 220V to 400V as a commercial voltage range. As described above, in the case of the present invention, when the power generated in the voltage corresponding to the low voltage stage belongs, there is a problem in that the use efficiency is reduced by about 20% depending on the boost for performing the function.

On the other hand, in the case of the present invention, if the power source belongs to a voltage corresponding to the high voltage stage, that is, for example, 400V or more, when providing it to the load 30 or the power transmission system 40 and the power transmission system 40 and Problems may arise due to the rated voltage error and the range of the operating voltage of the load 30, the voltage range of the inverter is usually limited as described above, for example, when a voltage of 425V or more is applied to the inverter with DC power. In this case, since the operation of the inverter is terminated and the inverter must be rebooted for a predetermined time (about 1 to 7 minutes) in order to restart the inverter after the step-down, power generation during the corresponding time is interrupted.

However, according to the present invention, as shown in FIG. 6, the generated power is sensed by the above-described voltage sensing unit 11 so as to belong to any one of a low voltage stage, a medium voltage stage, and a high voltage stage (S1). ), And among the power stages divided according to the voltage sensed by the voltage adjusting unit 13 so that the generated power is applied to any one of the three types of conversion modules 121, 122, and 123 provided in the power converter 12. After any one is selected (S2), the connection is controlled so that the generated power is applied to the conversion module 121, 122, 13 corresponding to the selected power stage among the divided power stages (S3).

In this case, the three types of conversion modules 121, 122, and 123 may be charged to use power at the highest efficiency in the corresponding voltage range when the generated power of the low voltage and high voltage range is applied as well as the rated voltage range. The charging of the battery 20, the use of power by the load 30, and the transmission of power to KEPCO through the power transmission system 40 may be controlled to automatically select and perform the function.

Through this, in order to supply power to a specific object of use, the voltage is boosted to a predetermined voltage using a single inverter, and then the power is supplied to the object of use, thereby inefficiently consuming power or interrupting operation according to the specifications of the inverter. This has the effect of minimizing the phenomenon that occurs.

In addition, as a problem described above, according to the single processable voltage range of the inverter, due to the repetition of the operation of the inverter is stopped at a high voltage stage and rebooting, the possibility of failure of the inverter, shortening of the life can occur, and the possibility of interruption of power production. Since it can be minimized, the maintenance and lifespan of the inverter in the power generation system using the solar cell is greatly improved.

Although the embodiments have been described above with reference to the limited embodiments and drawings, those skilled in the art will understand that various modifications and variations are possible from the above description. The terms "comprise", "comprise" or "have" described above mean that a component without a particularly opposite description may be included, and thus, other components are not excluded. It should be construed as more inclusive. In addition, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of the present invention.

Claims (10)

A voltage sensing unit which checks a voltage of a DC power supplied from a plurality of panel modules generating power by converting sunlight or solar heat into electrical energy;
It includes a plurality of conversion module to receive a direct current power supplied from the panel module through a power input stage to produce a transformed direct current or alternating current power to transmit to different loads that consume power through the power output stage, each The conversion module is divided into a low voltage stage type conversion module of a first range, a medium voltage end type conversion module of a second range, and a high voltage end type conversion module of a third range, which are set in descending order of the voltage applied to the power input terminal. A power converter including a plurality of conversion modules; And
DC power supplied from the panel module is applied, and power is applied to each of the power input terminals of the conversion module included in the power conversion unit, and power is supplied according to the voltage checked by the voltage sensing unit. And a voltage adjusting unit configured to control power transmission so as to be divided into power stages of a high voltage stage and to supply power to a conversion module of a type corresponding to the divided power stages among the three types of conversion modules.
The power generated from the panel module by the voltage adjusting unit has a voltage in the first range, which is the lowest range, is supplied to a plurality of rechargeable batteries connected to the low voltage stage type conversion module, and the power is greater than the first range. The power having the voltage of the second range, which is a high voltage range, is any one of a plurality of rechargeable batteries connected to the medium voltage stage type conversion module, a plurality of loads for power use, and a power transmission system for transmitting power produced by KEPCO. And a power having a voltage in a third range that is the highest voltage range higher than the second range is controlled to be supplied to either the power transmission system and the plurality of rechargeable batteries connected to the high voltage stage type conversion module. Power distribution device according to the power generation voltage of the power generation system using a solar cell.
The method of claim 1,
The low voltage stage type conversion module,
A power distribution device according to the power generation voltage of a power generation system using a solar cell, characterized in that it comprises a first converter which is a boost or step-down DC / DC converter for connecting a plurality of rechargeable batteries to the power output.
The method of claim 2,
The maximum threshold voltage of the low voltage terminal is a predetermined reference voltage set according to the connection state of the plurality of rechargeable batteries and the capacity of each battery in order to prevent overcharging according to the generation voltage of the power generation system using the solar cell. Power distribution unit.
The method of claim 1,
The medium voltage stage type conversion module,
A second converter, a DC / DC converter, and a third converter, a DC / AC converter, connected to any one of a plurality of rechargeable batteries, a plurality of loads for power use, and a power transmission system for transmitting power generated by KEPCO at the power output stage. Power distribution device according to the power generation voltage of the power generation system using a solar cell, characterized in that it comprises at least one.
The method of claim 4, wherein
The medium voltage stage type conversion module,
A first switching unit,
By the first switching unit, the charging mode for the rechargeable battery, the power supply mode for the plurality of loads and the power transmission system to the KEPCO automatically according to the charge amount of the rechargeable battery, the amount of power used in the plurality of loads Power distribution device according to the power generation voltage of the power generation system using a solar cell, characterized in that operated in any one of the transmission mode for.
The method of claim 5,
The medium voltage stage type conversion module,
The second converter is operated in the charging mode, and the third converter is controlled by the first switching unit to be operated in the power supply mode and the transmission mode to the power generation voltage of the power generation system using a solar cell. According to the power distribution device.
The method of claim 1,
The high voltage stage type conversion module,
A fourth converter, which is a DC / AC converter connected to a power transmission system for transmitting electric power produced by KEPCO to a power output terminal;
A meter connected to the fourth transducer; And
And a power transmission line connected to the meter for transmitting power to the power transmission system.
The power according to the power generation voltage of the power generation system using a solar cell, characterized in that configured to transmit power to the power transmission line through the meter, the power transmitted is measured by the meter to reflect the amount of power transmitted to the meter. Dispensing device.
The method of claim 7, wherein
The high voltage stage type conversion module,
And a fifth converter, which is an AC / DC converter connected to the rechargeable battery, the meter being separated from the power transmission line. The power distribution device according to the generation voltage of the power generation system using the solar cell.
The method of claim 8,
The high voltage stage type conversion module,
Surplus power other than the transmitted electric power is controlled by a second switching unit included in the meter to be applied to the fifth converter, and the DC power converted by the fifth converter is configured to be connected to a rechargeable battery so that the surplus power The power distribution device according to the power generation voltage of the power generation system using a solar cell, characterized in that controlled to be used to charge the rechargeable battery.
The method of claim 1,
The voltage adjusting unit,
An input signal for receiving the checked voltage value generated by the voltage sensing unit as an input signal, and an identification signal for identifying any one of the power terminals of the low voltage terminal, the medium voltage terminal, and the high voltage terminal according to the voltage value. A control module including an output stage for sending out to the apparatus; And
And a third switching unit which is a switching circuit which receives an output terminal of the control module as a control signal and applies DC power supplied from the panel module to any one of the plurality of conversion modules according to the received control signal. Power distribution device according to the power generation voltage of the power generation system using a solar cell.

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