KR102046821B1 - Power distribution and power transmission control apparatus based on generation voltage of solar-cell power generating system - Google Patents

Abstract

The present invention relates to an apparatus for controlling power distribution and transmission in accordance with generated power voltage of a power generation system using a solar cell, which improves the efficiency of power usage. The apparatus of the present invention comprises: a voltage sensing unit for checking voltage of DC power supplied from a plurality of battery panel modules; a power conversion unit including a plurality of conversion modules; a voltage control unit for controlling power transmission; and a power transmission control apparatus for supplying power to a power transmission system.

Description

POWER DISTRIBUTION AND POWER TRANSMISSION CONTROL 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 power generation interruption due to an interruption of a power transmission inverter by distributing power usage at low and high voltages under an optimal environment.

Recently, heating and cooling 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 the case of a typical inverter, the processable voltage is a commercial voltage range ranging from 10% error of 220V to 10% error of 380V. 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 distributing power for a new concept of inverter 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. It is an object of the present invention to provide a technology for maximizing power utilization while minimizing consumption.

In addition, during the transmission to KEPCO, as the inverter is stopped and rebooted according to the voltage for power transmission, 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 solar cells. In addition, there is another purpose to maximize the use efficiency of the power generation system itself.

In order to achieve the above object, the power distribution and transmission control apparatus according to the power generation voltage of the power generation system using a solar cell according to an embodiment of the present invention, a number of generating power by converting sunlight or solar heat into electrical energy A voltage detector for checking a voltage of a direct current power supplied from the panel module of the controller; 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; 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. A voltage adjusting unit configured to control power transmission so as to be divided into a power stage of a high voltage stage and to supply power to a conversion module of a type corresponding to the divided power stage among the three types of conversion modules; And a power source connected to at least one type of conversion module of the power conversion unit to supply power to a power transmission system for transmitting the generated power to KEPCO, wherein the power supply system supplies power to the power transmission system. And a power transmission control device configured to convert the frequency and voltage of the applied power according to the power transmission condition and control the power transmission system to be applied to the power transmission system.

The power transmission control device may include: a first detector configured to sense a first voltage that is a first voltage and a frequency that is a voltage of a power applied from the conversion module; A second voltage and frequency, which are a power transmission condition of the power transmission system, a second voltage and frequency which is connected between a meter for supplying power to the power transmission system and the power transmission system and is a voltage of a power supply flowing in a power transmission line in the same condition as the power transmission condition of the power transmission system; A second detector for checking a frequency; The first voltage is used to match the second frequency with the detection result of the first sensing unit and the second sensing unit, and to prevent a reverse flow during transmission of power generated in the power transmission line. The conversion module converts the magnitude of the first voltage so as to be proportional to the second voltage while being greater than the magnitude of the second voltage, but maintaining the magnitude of the converted voltage to be equal to or less than a predetermined threshold voltage value. A conversion control unit for generating a control command for controlling a change in power supplied from the control unit; And a power transmission conversion unit receiving power from the conversion module, receiving a control command generated from the conversion control unit, converting the voltage and frequency of the power applied according to the control command and applying the power to the power transmission system. Do.

The threshold voltage value is a maximum available voltage value of a preset inverter, and the conversion controller is applied from the conversion module regardless of the second voltage value when the magnitude of the converted voltage reaches the threshold voltage value. It is preferable to generate a control command for controlling the voltage of the received power supply to maintain the threshold voltage value.

The low voltage stage type conversion module preferably 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 terminal.

The maximum threshold voltage of the low voltage terminal is preferably a predetermined reference voltage set according to the connection state of the plurality of rechargeable batteries and the capacity of each battery to prevent overcharging.

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 preferably configured to include at least one of the third converter which is a DC / AC converter.

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 meter for transmitting electricity generated by the KEPCO to a power output stage; A fifth converter which is an AC / DC converter connected between the fourth converter and the rechargeable battery; And a second switching unit controlling a connection between the fourth converter, the meter, and the fifth converter to apply the power converted from the fourth converter to the meter or the fifth converter. It is configured to further include, so as to transmit power to the power transmission line through the meter, the power to be transmitted is measured by the meter so that the amount of power transmitted is reflected in the meter, surplus power other than the power to be transmitted is Preferably controlled by the second switching unit to be applied to a fifth converter, the direct current power converted by the fifth converter is configured to be connected to a rechargeable battery so that the surplus power is controlled to be used for charging the rechargeable battery. Do.

On the other hand, the power distribution and transmission control apparatus according to the power generation voltage of the power generation system using a solar cell according to another embodiment of the present invention, generated from a plurality of panel modules for generating power by converting sunlight or solar heat into electrical energy A first sensing unit which converts a DC power source into an alternating current and senses a first voltage which is a voltage of a power source applied from a conversion module which converts a frequency and voltage of the converted AC power and a first frequency which is a frequency; A power transmission condition of a power transmission system for transmitting the generated electric power to KEPCO, the power supply flowing between a meter for supplying power to the power transmission system and the power transmission system and having a same condition as the power transmission condition of the power transmission system. A second sensing unit checking a second voltage which is a voltage and a second frequency which is a frequency; The first voltage is used to match the second frequency with the detection result of the first sensing unit and the second sensing unit, and to prevent a reverse flow during transmission of power generated in the power transmission line. The conversion module converts the magnitude of the first voltage so as to be greater than the magnitude of the second voltage and proportional to the second voltage, but maintains the magnitude of the converted voltage to be equal to or less than a predetermined threshold voltage value. A conversion control unit for generating a control command for controlling a change in power supplied from the control unit; And a power transmission conversion receiving power from the conversion module, receiving a control command generated from the conversion control unit, converting the voltage and frequency of the power supplied according to the control command, and applying the power to a meter for supplying power to the power transmission system. It characterized in that it comprises a.

According to the present invention, a range of all voltages that a DC power generated by the panel module 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, thereby providing a low voltage. However, in the medium voltage terminal and the high voltage terminal, the power is controlled to supply power to the use target having optimum efficiency in the voltage range of each other.

In addition, when the voltage is boosted and transmitted by the power transmission control device, particularly in the high voltage terminal according to the power transmission condition of KEPCO, the inverter is stopped and rebooted at the high voltage terminal according to the single processable voltage range of the inverter. By repeating, the power failure in the power generation system using the solar cell can be greatly increased while maintaining the inverter's maintainability since the failure of the inverter, the possibility of shortening the lifespan, and the interruption of the power generation itself can be minimized. And there is an effect that the life is greatly improved.

In particular, the power transmission control device may be installed in an existing hybrid inverter, and the repetition of the operation of the inverter being stopped and rebooted at the high voltage stage described above may cause the inverter to fail, shorten the lifespan, and generate power. There is an effect that can minimize the interruption phenomenon.

In addition, in order to supply power to a specific user, by using a single inverter to step up to a predetermined voltage and then supply power to the user, the power is consumed inefficiently or interrupts operation according to the specifications of the inverter. There is an effect that can minimize the phenomenon.

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 and transmission control apparatus according to a 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 performance of the power distribution and power transmission control device according to the 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 and power transmission control apparatus according to a power generation voltage of a power generation system using a solar cell according to an embodiment of the present invention.
7 is a detailed configuration diagram of a power transmission control device of the present invention.
8 is a graph for explaining an example in which the transmission voltage is controlled according to the performance of the power transmission control device 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, FIG. 7 is a detailed configuration diagram of the power transmission control device of the present invention, and FIG. 8 is a This is a graph for explaining an example in which the power transmission voltage is controlled according to the function of the power transmission control 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. The conversion module 123 of the high voltage stage type is a high voltage range, that is, a voltage of a third range, which is applied to be a voltage corresponding to a power transmission condition of the power transmission system 40 of KEPCO according to the power transmission protocol of the power transmission system 40 of KEPCO. Can be stepped up or down.

Including the above-described function, the high voltage stage type conversion module 123 may include a fourth converter 1231 as illustrated in FIG. 3.

The fourth converter 1231 is a DC / AC converter connected to the power transmission system 40 through a meter 1232 and a power transmission line 1234 for transmitting electric power produced by the KEPCO to the power output terminal. Step-up or step-down function.

The meter 1232 may be included in the power transmission system 40 as described above, and transmits power to the power transmission line 1234 as described above, and the power transmitted is measured by the meter 1232 to transmit power. The amount of power to be reflected is configured 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 shown in FIG. 3, the high voltage stage type conversion module 123 is configured to be installed between the fifth converter 1235, the fourth converter 1231, and the meter 1232, and thus the fourth converter 1231. The electronic device may further include a second switching unit 1233 for applying the power applied from the third converter 1235 and the meter 1232 to one of the fifth converter 1235 and the meter 1232.

The fifth converter 1235 is an AC / DC converter and is controlled by the second switching unit 1233 so that the surplus power is applied to the fifth converter 1235 when surplus power other than the transmitted power exists. 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.

On the other hand, according to the power transmission conditions of the KEPCO transmission system 40, especially when the power transmission mode operation of the medium voltage stage and the power transmission in the high voltage stage, the inverter boosts or increases the voltage according to the power transmission conditions in order to perform the most efficient power transmission. It will force the power transmission. This will be implemented by performing the function of the above-described fourth converter, wherein, if the produced voltage is a high voltage according to the single processable voltage range of the inverter, if the boosted voltage exceeds the maximum value of the single processable voltage, The inverter may stop working and reboot.

The operation interruption phenomenon of the inverter may occur in the same manner as in the operation of the conventional hybrid inverter as shown in FIG. 1. In particular, in the operation of the existing hybrid inverter, the above-described charging mode, power supply mode, and power transmission mode in the inverter may be used. At the same time, during the power transmission in the high voltage stage, when the power use by the load 30 is suddenly progressed or stopped, the voltage of the power applied to the inverter may suddenly rise. In this case, as described above, a problem occurs in that power generation is stopped for rebooting the inverter for about 1 to 7 minutes.

In order to prevent such a phenomenon, between the meter 1232 and the conversion module including the third converter 1223 of the medium voltage terminal and the fourth converter 1231 of the high voltage terminal, etc. according to an embodiment of the present invention, FIG. And the power transmission control device 50 may be connected as shown in FIG. 3.

The power transmission control device 50 is configured to be included in the power distribution and power transmission control device 10 according to the power generation voltage of the power generation system using the solar cell according to the embodiment of the present invention as described above, or another embodiment of the present invention. Power distribution and power transmission control device according to the power generation voltage of the power generation system using a solar cell according to the example can be understood as itself. This may be implemented on a system in which power transmission control device 50 is included in power distribution and power transmission control device 10 according to a power generation voltage of power generation system using a solar cell according to an embodiment of the present invention and is distributed in force. Means that can be installed independently connected to the hybrid inverter system as shown in FIG.

As described above, when the power transmission control device 50 is included in the power distribution and power transmission control device 10 according to the generation voltage of the power generation system using the solar cell according to an embodiment of the present invention, for example, As described above, at least one type of conversion module of the power conversion unit 12, preferably a medium voltage stage type conversion module 122 or a high voltage stage capable of supplying power to the power transmission system 40 as described above. It is connected to the conversion module 123 of the type is supplied with power, and to supply power to the power transmission system 40 for transmitting the generated power to the KEPCO, the power transmission system 40 when supplying power to the power transmission system 40 It performs a function of controlling the frequency and voltage of the power supply to be applied to the power transmission system 40 in accordance with the power transmission conditions of the. Specifically, as shown in Figure 3 may be connected to the meter 1232 for checking the power amount.

A specific configuration example of such a power transmission control device 50 is shown in FIG. Referring to FIG. 6, the power transmission control device 50 includes a first detection unit 51, a second detection unit 52, a conversion control unit 53, and a power transmission conversion unit 54.

The first sensing unit 51 is connected to any one of the above-described power converter 12, specifically, the conversion module, or connected to an inverter, that is, a power conversion configuration when connected to the existing hybrid inverter described above. Configuration. In detail, the first detection unit 51 detects a first voltage that is a voltage of a power source applied from the above-described conversion module or a power conversion configuration and a first frequency that is a frequency. That is, when transmitting power to the power transmission system 40, the voltage and frequency of the power applied as the corresponding power immediately before transmission is sensed.

On the other hand, the second detection unit 52 is a power transmission condition of the power transmission system 40, and is connected between a meter and a power transmission system for supplying power to the power transmission system 40 and a power transmission line which is in the same condition as the power transmission condition of the system. A function of checking a second voltage, which is a second voltage and a frequency, of a power supply flowing in 1234 is performed. That is, the second detector 52 checks the voltage and frequency of the power transmission terminal of the KEPCO.

The conversion control unit 53 uses the detection results of the first detection unit 51 and the second detection unit 52 to match the second frequency in the case of the first frequency, and the power generated in the power transmission line 1234. The first voltage is converted to be proportional to the second voltage while being larger than the second voltage so as to prevent a reverse flow during power transmission of the first voltage. However, the magnitude of the converted voltage is maintained below the preset threshold voltage value. It performs a function of generating a control command for controlling the change in the power supplied from the conversion module to convert the magnitude.

That is, the conversion control unit 53 is a power transmission conversion unit 54 which will be described later is connected between the power conversion unit 12 and the meter 1232 to convert the voltage and frequency of the power applied from the power conversion unit 12 to measure the meter ( In supplying power to the power transmission system 40 through 1232, a control command is generated to transmit power to the power transmission conversion unit 54 so that the operation of the conversion module and the inverter can be maintained without being interrupted by the above-mentioned overvoltage. Perform the function of sending.

In general, KEPCO's power transmission system 40 has a unique power transmission condition. Among these frequencies, the first frequency and the second frequency have to be coincident with a predetermined frequency. In order to normally apply power generated from the panel module 100 to the power transmission system 40 and to transmit electricity to the KEPCO.

On the other hand, in the case of the voltage, for example, in the transmission condition, the transmission voltage of KEPCO may have an error of 380V and 10%. At this time, in order to perform the power transmission with high efficiency to the power transmission system 40, it is preferable to apply the power to a voltage larger than the power transmission voltage of KEPCO. Accordingly, as described above, the conversion controller 53 converts the magnitude of the first voltage to be proportional to the second voltage while being greater than the magnitude of the second voltage, thereby maintaining power transmission efficiency.

However, the inverter, that is, the conversion module has a preset maximum available voltage value, and in this state, for example, when the transmission voltage of KEPCO is detected as a high voltage, for example, in a section of 400V to 418V, the first When the magnitude of the voltage is converted to be proportional to the second voltage while being greater than the magnitude of the second voltage, a case in which the maximum available voltage value is exceeded may occur.

For example, in the above-described 400V to 418V section, when the maximum available voltage value is 425V, when the magnitude of the first voltage to be boosted exceeds 425V, when the first voltage is boosted as it is, the inverter and the conversion module may be The operation is interrupted as described above, the reboot takes 1 to 7 minutes as described above, there is a problem that the power production is interrupted.

In order to solve this problem, when the conversion control unit 53 generates a control command for converting the first voltage as described above, the magnitude of the first voltage is maintained so that the magnitude of the converted voltage is kept below a preset threshold voltage value. In order to convert the control command to control the change in the power supplied from the conversion module is generated. Of course, the control command may include a control command for causing the first frequency to coincide with the second frequency as the aforementioned frequency.

In other words, the critical low pressure value is preferably the maximum available voltage value of the inverter and the conversion module that are preset by the manufacturer or the like. At this time, the conversion control unit 53 controls the control command to maintain the first voltage value as the threshold voltage value regardless of the second voltage value when the magnitude of the converted voltage reaches the threshold voltage value by performing the above-described function. Will be created.

The power transmission conversion unit 54 receives the control command generated from the conversion control unit 53 according to the above-described flow, converts the voltage and frequency of the applied power according to the control command, and applies it to the power transmission system 40. At this time, since the first sensing unit 51 and the second sensing unit 52 perform a sensing function in real time, the first sensing unit 51 and the second sensing unit 52 sense the converted voltage and frequency as the new first voltage and the first frequency. Through this, it has the highest efficiency in the transmission condition, but controls the voltage and frequency of the power supply to maintain the operation of the inverter and the conversion module.

Referring to FIG. 7, by performing such a function, the transmission voltage range of the KEPCO (V1 to V2, V1 is a 10% step-down value of the rated voltage V0, and V2 may be understood as a 10% step-up value of V0 according to power transmission conditions). As the second voltage Va is converted at.), The first voltage Vb, i.e., the voltage to be converted, is set and applied to the power transmission system 40 as the above-described condition. At this time, for example, in the section t0 in which the voltage to be converted exceeds the threshold voltage Vth, the first voltage Vb in which the conversion is controlled is controlled to be maintained at the threshold voltage Vth by the above-described function.

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;
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. A voltage adjusting unit configured to control power transmission so as to be divided into a power stage of a high voltage stage and to supply power to a conversion module of a type corresponding to the divided power stage among the three types of conversion modules; And
Is connected to at least one type of conversion module of the power conversion unit is supplied with power to supply power to the power transmission system for transmitting the generated power to the KEPCO, the power supply of the power transmission system when the power supply to the power transmission system And a power transmission control device configured to convert the frequency and voltage of the applied power according to the condition and apply the converted power to the power transmission system.
The power transmission control device,
A first sensing unit sensing a first voltage which is a voltage of a power applied from the conversion module and a first frequency which is a frequency;
A second voltage and frequency, which is a voltage of a power source connected to a meter for supplying power to the power transmission system and the power transmission system and flowing in a power transmission line which is in the same condition as the power transmission condition of the power transmission system as a power transmission condition of the power transmission system A second detector for checking a frequency;
The first voltage is used to match the second frequency with the detection result of the first sensing unit and the second sensing unit, and to prevent a reverse flow during transmission of power generated in the power transmission line. The conversion module to convert the magnitude of the first voltage to be proportional to the second voltage while being greater than the magnitude of the second voltage, but to maintain the magnitude of the converted voltage to be equal to or less than a predetermined threshold voltage value. A conversion control unit for generating a control command for controlling a change in power supplied from the control unit; And
A power transmission converter receiving power from the conversion module, receiving a control command generated from the conversion control unit, converting a voltage and a frequency of the power applied according to the control command and applying the power to the power transmission system; Power distribution and transmission control device according to the power generation voltage of the power generation system using a solar cell.
delete The method of claim 1,
The threshold voltage value is,
The maximum available voltage value of the preset inverter,
The conversion control unit,
When the magnitude of the converted voltage reaches the threshold voltage value, generating a control command for controlling to maintain the voltage of the power applied from the conversion module to the threshold voltage value regardless of the second voltage Power distribution and power transmission control device according to power generation voltage of power generation system using solar cell.
The method of claim 1,
The low voltage stage type conversion module,
A power distribution and power transmission control apparatus according to a 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 4, wherein
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 and power transmission control device.
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 and transmission control apparatus 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 6,
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 and power transmission control 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 7, wherein
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. Power distribution and power transmission control device according to.
The method of claim 1,
The high voltage stage type conversion module,
A fourth converter which is a DC / AC converter connected to a meter for transmitting electric power produced by KEPCO to a power output terminal;
A fifth converter which is an AC / DC converter connected between the fourth converter and a plurality of rechargeable batteries connected to a power output terminal; And
A second switching unit controlling a connection between the fourth converter, the meter, and the fifth converter to apply power converted from the fourth converter to the meter or the fifth converter; By further comprising a,
The electric power is transmitted to the power transmission line through the meter, the electric power transmitted is measured by the meter so that the amount of power transmitted is reflected in the meter, and the surplus power other than the electric power transmitted is applied to the fifth converter. Controlled by a second switching unit, the DC power converted by the fifth converter is configured to be connected to a rechargeable battery, the surplus power is controlled to be used to charge the rechargeable battery, the power generation using the solar cell Power distribution and power transmission control device according to the generation voltage of the system.
delete

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