JP3164059U - Solar power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and inexpensively install a solar power generation apparatus by bringing it in an indoor or outdoor place where electric power is required and installing and connecting a cable. A solar cell array 11 that converts solar energy into DC power, a battery 12 that charges DC power output from the solar cell array 11, and a DC load that is discharged from the battery 12 is converted into AC power to generate a power load. The battery 12 and the inverter 13 have a portable structure and can be connected and disconnected via the power cables 14 and 15. [Selection] Figure 1

Description

  The present invention relates to a photovoltaic power generation apparatus that supplies power to a power load for a low-voltage system.

  Today, as part of global environmental measures, solar energy is converted to DC power using a solar cell array, and this DC power is converted to AC power by an inverter, which is used as a power load connected to a low-voltage system in the home. Solar power generators that can be supplied have been widely used. (For example, see Patent Document 1).

  In this solar power generation device, a solar cell array is installed on the roof of a house or the roof of a building, and is arranged facing the direction of sunlight irradiation. The solar cell array is configured by arranging a plurality of solar cell modules in a plane, and connecting them in series to form a string. Depending on the number of solar cell arrays arranged, this string may be arranged in one row or in two or more rows. is doing.

  Moreover, the power cable for taking out the electric power which the solar cell array generated is provided according to the number of the strings, and the generated electric power is sent to the inverter via the power cable and the connection box. The inverter receives direct current power supplied from the solar cell array via the power cable, and converts this direct current power into commercial frequency alternating current power boosted to, for example, 110 volts.

  This AC power is supplied to a power load for a low-voltage system such as an illumination lamp or a motor connected to the low-voltage system. Such a solar power generation device is installed on the roof of a house or the roof of a building as described above, and is useful when making up for insufficient power during a period of high power demand for a commercial power source (low voltage system). .

JP 09-045950 A

  However, in such a conventional solar power generation device, a solar cell array in which a solar cell module is incorporated is fixedly installed at a predetermined position on a roof or a roof. For this reason, batteries that receive and charge DC power generated by this solar cell array, and inverters that convert this DC power into AC power are also fixed to the wall or room near the solar cell array installation section. Attached to. Therefore, these batteries and inverters cannot be moved after installation.

  For example, when a new building is built in the surrounding area or when leaves of standing trees grow thickly, when sunlight does not directly enter the solar cell array, the solar cell panel does not output the desired generated power. In addition, in order to obtain the desired generated power, the installation position of the battery and the inverter together with the heavy solar cell array must be changed to a position where the sunlight receiving condition is good. However, there is a disadvantage that the burden of work cost is unavoidable because the work of changing the installation position becomes large.

  In addition, in areas affected by natural disasters such as floods or earthquakes where the power system is down, or in areas where there is no power distribution facility for power lines far from urban areas, power loads for low-voltage systems such as rice cookers and lighting cannot be used. It is.

  The present invention has been made in view of the above-mentioned circumstances, and the purpose of the present invention is to bring it into any place indoors or outdoors that requires electric power in addition to the rooftop of a house, the rooftop of a building, etc. It is to provide a solar power generation device that can be installed easily, and that can easily and inexpensively supply power extracted from the solar cell array to a power load for a low-voltage system.

  In order to achieve the above-described object, a photovoltaic power generation apparatus according to the present invention includes a solar cell array that converts solar energy into DC power, a battery that charges DC power output from the solar cell array, and the solar cell. An inverter that converts DC power output by the array or DC power discharged by the battery into AC power and supplies the power load, and the battery and the inverter have a weight that can be lifted by an operator, A power cable is connected between the solar cell array and the battery and between the battery and the inverter so as to be connectable and disengageable, respectively.

  With this configuration, batteries and inverters are installed along with solar cell arrays in places where power is required, such as buildings and buildings in urban areas, as well as in disaster-affected areas of natural disasters and mountains without power systems. Thus, stable power supply to the power load for the low-voltage system can be realized easily and at low cost.

  Moreover, the solar power generation device according to the present invention is characterized in that the battery and the inverter are provided with casters capable of running them on the floor.

  With this configuration, it is possible to efficiently and smoothly carry out the installation work of the battery and the inverter and the work of connecting the power cable between them.

  Furthermore, the photovoltaic power generation apparatus according to the present invention includes a DC power detector connected between the solar cell array and the battery, a load power detector connected between the inverter and the power load, A power comparator that compares the power values detected by the DC power detector and the load power detector, and a power switch that switches power supply to the power load or / and the system according to the comparison result. And

  Thus, the output power of the inverter can be automatically and selectively supplied to the power load or / and the low-voltage system according to the DC power capacity, and the power from the low-voltage system can be directly switched to the power load. As a result, power can be supplied to the power load without interruption.

  According to the present invention, it is possible to install a solar power generation device easily and inexpensively by bringing it into an indoor or outdoor place where power is required and connecting it to a cable, In any region or place where there is no power facility, it is possible to supply commercial frequency power to the power load for the low voltage system.

  The present invention has been briefly described above. The best mode for carrying out the invention described below will be described in detail with reference to the accompanying drawings.

It is a perspective view of the solar power generation device concerning the embodiment of the present invention. It is a circuit diagram of the solar power generation device shown in FIG.

  Hereinafter, an embodiment of a solar power generation device according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a photovoltaic power generation apparatus according to one embodiment, and FIG. 2 is a circuit diagram thereof. In the figure, the solar power generation device 10 includes a solar cell array 11, a battery 12, and an inverter 13. Among these, the solar cell array 11 is formed by arranging a plurality of solar cell modules as semiconductor photoelectric conversion elements such as silicon.

  A plurality of solar cell modules are connected in series and in parallel and covered with a weather-resistant material. Specifically, for example, a light transmission plate such as a glass plate or a synthetic resin plate is disposed on the light receiving surface of the solar cell element, and a Teflon (registered trademark) film, PVF (polyvinyl fluoride), A weather-resistant film such as PET (polyethylene terephthalate) is applied to form a laminated structure of these light transmission plates, solar cell elements, and weather-resistant films. The stacked structure is a rectangular body, and a frame body such as aluminum is mounted on the peripheral surface of the rectangular body. Further, a connection box is provided on the back side of the solar cell module, and a terminal for taking in the output power of the solar cell module is provided here.

On the other hand, the battery 12 is connected to the solar cell array 11 via the cable 14, charges the voltage output from the solar cell array 11, and supplies necessary and stable DC power to the inverter 13. Further, an inverter 13 is connected to the battery 12 via a cable 15, and the inverter 13 converts DC power supplied via the battery 12 into AC power.
An AC capacitor and an AC reactor (both not shown) for adjusting the AC output waveform to a sine wave are connected to the output side of the inverter 13.

  By the way, the weight of the photovoltaic power generation apparatus 10 having such a configuration is relatively light and small, the weight of the solar cell array 11 is, for example, 8 kg, the battery 12 connected thereto is 50 kg, and the inverter connected to the battery 13 is 4.5 kg, each of which can be carried by one worker or two h. The battery 12 and the inverter 13 have casters 16 and 17 at the bottom of the casing. Thereby, the battery 12 and the inverter 13 can be easily moved or run on the floor surface during the installation work.

  Further, the battery 12 has a pair of handles 18 attached to the top of the casing, and the inverter 13 has a handle 19 attached to the top of the casing. Therefore, it is possible to facilitate lifting and lowering of the battery 12 by an operator by handling these handles and the handle. The inverter 13 is provided with a plug insertion port 20 which is a voltage extraction port of the load for the low voltage system. For this reason, each of the battery 12 and the inverter 13 can be carried separately together with the solar cell array 11.

  As described above, the solar cell array 11 and the battery 12 are connected by the power cable 14, and the battery 12 and the inverter 13 are connected by the power cable 15. Therefore, the connection work of these electric power cables 14 and 15 is easy because the casters 16 and 17 can move the battery 12 and the inverter 13 easily. Therefore, the solar power generation apparatus 10 having such a configuration is not limited to a house or a rooftop of a building, but is simply transported and installed in an outdoor garden, a disaster-affected area of a natural disaster, or a mountain field without a low-voltage power distribution facility. Power supply to the system load can be realized easily and at low cost.

  FIG. 2 is a block diagram conceptually showing the electrical system of the photovoltaic power generator 10 according to this embodiment. In this block diagram, a DC power detector 31 is connected between the solar cell array 11, the battery 12 and the inverter 13. A power switch 33 and a load power detector 34 are connected in series between the inverter 13 and the power load 32. The power switch 33 is connected to the low voltage system 36 via the switch 35. Reference numeral 37 denotes a power comparator that compares the power values detected by the power detectors 31 and 34.

  In this circuit, the battery 12 is charged with the DC power generated by the solar cell array 11, and the DC power stabilized by the battery 12 is supplied to the inverter 13. The inverter 13 converts the DC power into AC power having a commercial frequency and can supply the power to a low-voltage power load 32 such as an illumination lamp or an AC motor through the plug insertion port 20 shown in FIG.

  On the other hand, the DC power detector 31 detects power obtained at both ends of the battery 12, and the load power detector 34 detects power consumed by the power load 32. The power detected by each of these power detectors 31 and 34 is input to the power comparator 37, and the power comparator 37 inputs a switching control signal corresponding to the difference between the power values to the power switch 33.

  As described above, when the power value A detected by the DC power detector 31 is sufficiently larger than the power value B detected by the load power detector 34 (A> B), the power comparator 37 determines that the inverter 13 The power switch 33 is switched so that AC power from the power supply 32 is supplied to the power load 32, and is also supplied (sold) to the low-voltage system 36 via the switch 35. On the other hand, when the power value A detected by the DC power detector 31 is equal to the power value B detected by the load power detector 34 (A = B), the power switch 33 connects the inverter 13 to the low voltage system 36. The power supply is cut off and the power supply to the power load 32 is switched to continue.

  On the other hand, when the power value A detected by the DC power detector 31 is lower than the power value B detected by the load power detector 34 (A <B), the power switch 33 receives power load from the inverter 13. The supply of AC power to the power supply 32 is stopped and the power from the low-voltage system 36 is switched to be supplied to the power load 32 via the switch 35. In this case, while the battery 12 is continuously charged, the power of the low-voltage system 36 is purchased and the power is continuously supplied to the power load 32. As a result, the power load 32 continues to operate or drive without a power failure.

  Therefore, the solar power generation apparatus 10 having such a configuration is easy to handle, highly versatile, even in an area where a low-voltage system does not exist, simply carry it to the area, and execute a predetermined cable connection work. The effect that the power supply to the power load for the low-voltage system can be realized easily and at low cost is obtained.

  As described above, the solar power generation device 10 according to the present embodiment includes the solar cell array 11 that converts solar energy into DC power, the battery 12 that charges the DC power output by the solar cell array 11, and the solar cell array. 11 and the inverter 13 that converts the DC power output from the battery 11 or the DC power discharged from the battery 12 into AC power and supplies the power to the power load 32. The battery 12 and the inverter 13 can be lifted by an operator. It has a weight, and the power cables 14, 15 are connected between the solar cell array 11 and the battery 12 and between the battery 12 and the inverter 13, respectively, so that the solar cell can be connected and disconnected. The battery 11 and the inverter 13 are connected together with the array 11 in a region where there is no low-voltage system or a power system. It can simplify the task of installing carrying in such affected areas of emissions and natural disasters, thereby making it possible to realize the power supply to the various power load of the low-pressure system in a simple and low-cost.

  Further, the battery 12 and the inverter 13 are provided with casters 16 and 17 that can run them on the floor, so that the moving work and the installation work on the floor such as the cable connection work between the battery 12 and the inverter 13 can be efficiently performed. Can be done smoothly.

  Furthermore, the DC power detector 31 connected between the solar cell array 11 and the battery 12, the load power detector 34 connected between the inverter 13 and the power load 32, the DC power detector 31 and the load By providing a power comparator 37 that compares each power value detected by the power detector 34 and a power switch 33 that switches power supply to the power load 32 or / and the system according to the comparison result, according to the battery capacity Thus, the output power of the inverter 13 can be automatically and selectively supplied to the power load or / and the low-voltage system 36, and the power from the low-voltage system 36 can be directly supplied to the power load 32. As a result, commercial frequency AC power can be supplied to the power load 32 without interruption.

  The solar power generation device according to the present invention can be installed (moved) indoors or outdoors where electric power is required, and can be installed in a power load for a low-voltage system, such as a lighting lamp or a motor. The power extracted from the array can be supplied easily and at low cost, and it is useful for a solar power generation apparatus that supplies power to a power load for a low-voltage system.

DESCRIPTION OF SYMBOLS 10 Photovoltaic power generation device 11 Solar cell array 12 Battery 13 Inverter 14, 15 Power cable 16, 17 Caster 18 Handle 19 Grip 20 Plug insertion port 31 DC power detector 32 Power load 33 Power switch 34 Load power detector 35 Switch 36 Low voltage system 37 Power comparator

Claims (3)

A solar cell array for converting solar energy into DC power;
A battery for charging DC power output from the solar cell array;
An inverter that converts direct current power output from the solar cell array or direct current power discharged from the battery into alternating current power and supplies the alternating current power to the power load; and
The battery and the inverter have a weight that can be lifted by an operator,
A solar power generation apparatus, wherein a power cable is connected between the solar cell array and the battery and between the battery and the inverter so as to be connectable and disconnectable.   The solar battery according to claim 1, wherein the battery and the inverter are provided with casters capable of running them on the floor. A DC power detector connected between the solar cell array and the battery;
A load power detector connected between the inverter and the power load;
A power comparator for comparing the power values detected by the DC power detector and the load power detector;
In accordance with this comparison result, a power switch that switches power supply or / and power supply to the system,
The solar power generation device according to claim 1, comprising:

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