JP3875149B2 - Solar power system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention converts a DC power generated by a solar cell into an AC power by a power conditioner, supplies the power generated by grid connection with a commercial power source to a load in a house, or sells the power to the commercial power source side. The present invention relates to a photovoltaic power generation system, and more particularly to display of the power generation state.
[0002]
[Prior art]
Conventionally, solar power that converts DC power generated by solar cells into AC power by a power conditioner and supplies the power generated by grid connection with a commercial power source to a load in the house or to the commercial power source Power generation systems are well known. In addition, such solar power generation systems often have display means for displaying the generated power and the accumulated power amount.
[0003]
Furthermore, a photovoltaic power generation system having a display means for measuring and displaying the power consumption and trading power in a house has also appeared. Here, the power consumption is the power consumed by the load in the house. In a solar power generation system, the power generated by the solar power generation system is usually applied to the house, but when the generated power is not enough, for example, when the amount of power generation is low, such as at night or in the rain, or when the load in the house is large Is supplied with a shortage from the commercial power supply (purchasing power from the power company).
[0004]
On the contrary, when the generated power is surplus, for example, when the amount of generated power is large or when the load in the house is small, the surplus power is reversely flowed to the commercial power source (sold to the power company). Hereinafter, display means in the conventional photovoltaic power generation system will be described with reference to the drawings.
FIG. 11 is a diagram showing an example of display means in a conventional solar power generation system. In FIG. 11, reference numeral 8 denotes display means provided in the solar power generation system, and 8 a denotes a display screen section provided in the display means 8. Reference numeral 8 c denotes a digital display unit provided in the display screen unit 8 a, and reference numeral 8 d denotes a display switching unit provided in the display unit 8.
[0005]
In this conventional solar power generation system, on the digital display unit 8c, the power generated by the solar power generation system and the amount of accumulated power generation, as well as the power consumption in the house, the power purchased, and the power sold are displayed numerically. . Then, which of these electric powers (power amounts) is displayed can be selected by operating the display switching means 8d.
[0006]
[Problems to be solved by the invention]
Since the conventional solar power generation system as described above is configured as described above, the display means 8 only expresses numerical values and alphabets, and the display means 8 has poor expressive power. It was difficult to intuitively grasp the power situation of the. In addition, in order to confirm a plurality of pieces of power information, it is necessary to perform an operation for switching the display several times, which also makes it difficult to grasp the power state in the house. That is, the conventional display means 8 has limited information that can be easily communicated to the user.
[0007]
Accordingly, the present invention has been made to solve the above-described problems. The present invention is intended to solve the above-described problems. The operation state such as the power generated by the photovoltaic power generation system and the amount of accumulated power generated, as well as the power consumption in the house, the power purchased, It is an object of the present invention to provide a photovoltaic power generation system having a display means that can more easily understand a power status such as electric power to a user.
[0008]
[Means for Solving the Problems]
  A photovoltaic power generation system according to the present invention is a photovoltaic power generation system that converts a DC output of a solar cell into an alternating current and is connected to a commercial power source. Supplied from the gridPower purchase measuring means for measuring the electric power purchased,Reverse power to commercial power systemA power sale measuring means for measuring the power sale power, a power consumption calculation means for calculating the power consumption by comparing any one of the power sale power and the power purchase power with the generated power, and a center as a starting point. Assign generated power and consumed power to the plus or minus side of one axis of the dimension orthogonal axes, assign sold power and purchased power to the plus or minus side of the other axis, and the measured generated power, purchased power, Displays the power sales and calculated power consumption so that the display dot extends from the center to the outside as the value increases.And a display means having a dot matrix display portion.
[0009]
  Also,A photovoltaic power generation system according to the present invention is a photovoltaic power generation system that converts a DC output of a solar cell into an alternating current and is connected to a commercial power source. A power purchase measuring means for measuring the power purchased from the grid, a power sale measuring means for measuring the power sold back to the commercial power supply system, and any one of the power sales power and the power purchased Power consumption calculating means for calculating power consumption by comparing with generated power, and assigning generated power and power consumption to the plus or minus side of one of the two-dimensional orthogonal axes with the center as the origin. Assign power selling and buying power to the plus and minus sides, display the measured generated power and calculated power consumption as a bar so that the display dot extends from the center to the outside as the value increases Characterized by comprising a display means having a dot matrix display unit which displays to represent the measured power sale power and power purchase power at a location on the other axis of the bar.
[0012]
  Moreover, in the photovoltaic power generation system, the display means is a power sales state.The numbervaluesoIt has a digital display part to display.
[0013]
In the solar power generation system, the display unit includes a selection unit that selects any one of the generated power, the power consumption, the sold power, and the purchased power, and the display unit is a value of the selected power. Is displayed on the digital display unit.
[0014]
Further, in the solar power generation system, the display unit includes a power amount self-sufficiency rate calculating unit that calculates a self-sufficiency rate of the power amount from the accumulated power generation amount and the accumulated power consumption amount, and the display unit is calculated. The self-sufficiency rate of the amount of electric power displayed is displayed on the digital display unit.
[0015]
Further, in the solar power generation system, the display means includes a display switching means, and the display means is operated in the dot matrix display unit when the display switching means is operated. Alternatively, the operation data is displayed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a diagram showing a configuration of a photovoltaic power generation system according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a solar cell, which is installed on a roof of a house or the like, and receives direct sunlight to generate DC power. Reference numeral 2 denotes a junction box that collects DC power generated by the solar cell.
[0017]
3a is power conversion means for converting DC power from the connection box 2 into AC power, and 3b is power generation for measuring the power generated by the solar cell 1 and converted to AC by the power conversion means 3a via the connection box 2. It is a power measurement means. A power conditioner 3 includes a power conversion unit 3a and a generated power measurement unit 3b, and has an interconnection protection function (not shown).
[0018]
4 a is a main breaker, 4 b is an interconnection breaker, 4 c is a branch breaker, and each breaker 4 a to 4 c is housed in the distribution board 4. Reference numeral 6 denotes a commercial power source (system). Electric power from the commercial power source (system) 6 is supplied into the house through the main breaker 4a and further supplied to each load in the house through the branch breaker 4c. The output (generated power) of the power conditioner 3 is connected to a commercial power source (system) 6 via the connection breaker 4b.
[0019]
The generated power generated by the solar power generation system is supplied to each load in the house via the distribution board 4. However, when the amount of power generation is low, such as at night or in the rain, or when the load used in the house is large, supply of insufficient power from the commercial power supply 6 side is not possible because the power generated by the solar power generation system cannot be used alone. And apply it to the load. That is, a shortage of power is purchased from an electric power company.
[0020]
On the other hand, when the amount of power generation is large in fine weather or when the load in the house is small, power generated by solar power generation is left, so the surplus power flows backward to the commercial power source. That is, the surplus power is sold to the power company. 7 detects the value of the current passing through the main breaker 4a in the distribution board 4 and the value of the voltage in the distribution board 4, and supplies power (purchased power) from the commercial power source (system) 6 and commercial power source ( This is a trading power measuring means for calculating the reverse power (power sold) to the grid 6, and is installed inside the distribution board 4. The trading power measuring means 7 may be configured to be installed outside the distribution board 4.
[0021]
Reference numeral 5 denotes display means, which includes information relating to the generated power from the generated power measuring means 3b, power selling power from the buying and selling power measuring means 7, information relating to purchased power, or these generated power, sold power and purchased power. Displays information about the calculated power consumption in the house. Here, the power (power consumption) consumed by the load in the house can be calculated from the relationship of power selling power = generated power-power consumption or purchased power = power consumption-power generated power.
[0022]
In this way, the power consumption is calculated by comparing the value of either the sold power or the purchased power measured by the trading power measuring means 7 with the generated power measured by the generated power measuring means 3b. . A calculation means (not shown) for calculating the power consumption is provided in the display means 5. Here, the detail of the display means 5 is demonstrated with reference to FIG. In FIG. 2, reference numeral 5a denotes a display screen section provided in the display means 5, which is composed of a device such as a liquid crystal plate.
[0023]
Reference numeral 5b denotes a dot matrix display unit provided on the display screen unit 5a, in which display units are arranged in a matrix, and is realized by a liquid crystal electrode pattern or the like. Reference numeral 5c denotes a digital display unit provided on the display screen unit 5a, in which display units are arranged in seven segments, and is realized by a liquid crystal electrode pattern or the like. Reference numeral 5e denotes selection means, and 5f denotes display switching means, each realized by a switch or the like.
[0024]
In addition, in Embodiment 1, it was set as the structure which performs calculation of the purchased power and the sold power by the buying and selling power measuring means 7 provided in the distribution board 4, but it is not limited to this. For example, the buying and selling power measuring means 7, only the detection of the current value passing through the main breaker 4 a and the voltage value in the distribution board 4 may be performed, and the calculation to the trading power may be performed by the display means 5.
[0025]
The operation of the display means 5 having such a configuration will be described below. The display unit 5 obtains information about the generated power from the generated power measurement unit 3b, obtains information about the power sale power and the power purchase power from the trading power measurement unit 7, and performs necessary arithmetic processing on the information, Various display information is generated and displayed on the display screen unit 5a in a display form suitable for each display information. At this time, power consumption is calculated and displayed by power consumption calculation means (not shown) provided in the display means 5.
[0026]
FIGS. 3A and 3B are diagrams showing examples of each display information and its display form in the display screen section shown in FIG. In FIG. 3, the description will be made by paying attention to the dot matrix display portion 5b. In the dot matrix display section 5b provided on the display screen section 5a, four types of power, that is, generated power, power consumption, sold power, and purchased power are arranged on the horizontal axis, and the current power is displayed on the vertical axis. Allocate and display in a batch as a bar graph.
[0027]
FIG. 3 (a) is an example in which each electric power is collectively displayed in a bar graph when electric power sold is zero and generated electric power, consumed electric power and purchased electric power are present during electric power purchase. FIG. 3B shows an example in which each power is collectively displayed in a bar graph when the purchased power is zero and the generated power, the consumed power, and the sold power exist.
[0028]
Thus, in this embodiment, since the display means 5 displays the respective powers collectively as a bar graph as a display form in the dot matrix display unit 5b, 4 of generated power, consumed power, sold power, and purchased power is displayed. It is possible to grasp the state of various kinds of power visually and collectively, and to grasp the power state in the house intuitively and instantaneously.
[0029]
In the example of FIG. 3, the four power states including power consumption, generated power, sold power, and purchased power are displayed on the dot matrix display unit 5 b. ), (B), a configuration in which three types of power states excluding power consumption, generated power, sold power, and purchased power are displayed on the dot matrix display unit 5b.
[0030]
In this case as well, it is possible to visually and collectively grasp the state of the three types of generated power, sold power and purchased power, and to intuitively grasp the power status in the house instantly. . Fig. 4 (a) is an example in which a bar graph is displayed in a lump when electric power purchased is zero and generated electric power and electric power sold are present, and Fig. 4 (b) is electric power purchased. In FIG. 3, the bar graph in the case where the electric power sold is zero and the generated electric power and the purchased electric power exist is collectively displayed.
[0031]
Embodiment 2. FIG.
5 (a) to 5 (c) are diagrams showing examples of display information on the display screen section of the display means in the photovoltaic power generation system according to Embodiment 2 of the present invention and examples of the display forms. 5, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Since the system configuration of the photovoltaic power generation system in this embodiment is the same as that of Embodiment 1 shown in FIG. 1, the description thereof is omitted. Further, the configuration of the display means 5 is the same as that of the first embodiment shown in FIG. Here, the description will be made with attention paid to the dot matrix display portion 5b of the display screen portion 5a.
[0032]
5 (a) to 5 (c), in any case, in the dot matrix display portion 5b, the generated power on the X axis, the consumed power on the -X axis, the sold power on the Y axis, and the purchased power on the -Y axis. Allocates and takes a display form of a graph extending from the center to the outside. That is, the generated power is a graph extending from the center in the X-axis direction (right side), and the power consumption is a graph extending from the center in the −X-axis direction (left side).
[0033]
In addition, the sold power is a graph extending from the center in the Y-axis direction (upper side), and the purchased power is a graph extending from the center in the −Y-axis direction (lower side). In the case of FIG. 5 (a), a graph with dots (dots), in the case of FIG. 5 (b), a bar graph in each direction, and in the case of FIG. 5 (c), a graph represented by one rectangle passing through the intercept of each axis. It is.
[0034]
As described above, in this embodiment, the display means 5 displays generated power, consumed power, sold power, purchased power on the four axes (X, -X, Y, -Y) in the dot matrix display section 5b. Since it is assigned and displayed, the + X axis direction is the direction in which the generated power increases and the power consumption decreases, and the + Y axis direction is the direction in which the power sales power increases (the power purchased power decreases). It is possible to intuitively determine whether the state is good or bad, and the user can easily be aware of power saving.
[0035]
Embodiment 3 FIG.
FIG. 6 is a diagram showing each display information on the display screen portion of the display means and an example of the display form in the photovoltaic power generation system according to Embodiment 3 of the present invention. 6, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Since the system configuration of the photovoltaic power generation system in this embodiment is the same as that of Embodiment 1 shown in FIG. 1, the description thereof is omitted. Further, the configuration of the display means 5 is the same as that of the first embodiment shown in FIG. Here, not only the dot matrix display unit 5b but also the digital display unit 5c will be described.
[0036]
In the dot matrix display unit 5b, as in the case of the second embodiment shown in FIG. 5, the generated power is assigned to the X axis, the consumed power is assigned to the -X axis, the sold power is assigned to the Y axis, and the purchased power is assigned to the -Y axis. It takes the form of a graph that extends from the center to the outside. However, the generated power and power consumption are represented by the length of the bar (X axis, -X axis), and the sold power and purchased power are represented by the vertical position of the bar (Y axis, -Y axis).
[0037]
In addition, the digital display unit 5c displays a numerical value obtained by indexing the power trading state. Examples of indexing include 100 when “power consumption = 0, generated power = maximum value in the system, that is, maximum selling power”, and “generated power = 0, power consumption = maximum value in the house, ie, purchase. In the case of “maximum electric power”, 0 may be allocated, and the interval between them may be allocated evenly.
[0038]
Generally, a residential photovoltaic power generation system is about 3 kW system, whereas the peak value of power consumption is often larger than that. Therefore, when the graph scale of the dot matrix display unit 5b is adjusted to the generated power, the peak of power consumption or purchased power overflows from the graph and cannot be read correctly. Even in such a case, if there is a numerical display on the indexed digital display section 5c, it is possible to grasp the power purchase / purchase status, that is, the power generation consumption status.
[0039]
As described above, in this embodiment, the generated power and the consumed power are represented by the length of the bar (X axis, -X axis direction), and the sold power and the purchased power are represented by the bar positions (Y axis, -Y axis). (Direction), power generation and consumption status is a change in the length of the bar, and buying and selling power status can be seen at a glance by the vertical movement of the bar, making it easier to grasp the power status in the house. it can.
[0040]
Further, even if the actual power state may deviate from the graph area, the display means 5 causes the digital display unit 5c to display an index of the power purchase / purchase status, thereby grasping the power status in the house. be able to. In other words, by using both the dot matrix display unit 5b and the digital display unit 5c, the expressive power of the display means 5 is increased, and more easily understandable information can be conveyed to the user.
[0041]
Embodiment 4 FIG.
FIG. 7 is a diagram showing each display information on the display screen part of the display means in the photovoltaic power generation system according to Embodiment 4 of the present invention and an example of the display form. 7, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Since the system configuration of the photovoltaic power generation system in this embodiment is the same as that of Embodiment 1 shown in FIG. 1, the description thereof is omitted. Further, the configuration of the display means 5 is the same as that of the first embodiment shown in FIG. Here, as in the third embodiment, not only the dot matrix display unit 5b but also the digital display unit 5c will be described.
[0042]
In the dot matrix display unit 5b, each of the four types of electric power as in the second and third embodiments shown in FIGS. The digital display unit 5c selects one of the four types of electric power and displays the electric power value as a numerical value (kW). The selection of each power to be displayed numerically on the digital display unit 5c is performed by operating the selection means 5e of the display means 5 as shown in FIG. For example, each time the selection unit 5e is pressed, values of generated power, consumed power, sold power, and purchased power are sequentially displayed on the digital display unit 5c. In the example of FIG. 7, the power sale power is selected and displayed on the digital display unit 5c.
[0043]
Thus, in this embodiment, since the display means 5 displays the value of the electric power selected by the selecting means 5e on the digital display section 5c, each electric power value can be grasped specifically by a numerical value. Can raise awareness about power saving. Also in this case, by using both the dot matrix display unit 5b and the digital display unit 5c, the expressive power of the display means 5 is increased, and more easily understandable information can be conveyed to the user. .
[0044]
FIG. 7 shows a case where the power sale power is selected and the dot sale display unit 5b displays the power sale power in a graph and the digital display unit 5c displays the power sale power numerically. As shown in FIG. 4, the dot matrix display unit 5b displays a message so that the power sale can be understood (for example, scrolling “Utage mass”), and the digital display unit 5c displays the power sale power numerically. Also good.
[0045]
Embodiment 5 FIG.
FIG. 9 is a diagram showing examples of display information on the display screen section of the display means in the photovoltaic power generation system according to Embodiment 5 of the present invention, and display examples thereof. 9, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Since the system configuration of the photovoltaic power generation system in this embodiment is the same as that of Embodiment 1 shown in FIG. 1, the description thereof is omitted. Further, the configuration of the display means 5 is the same as that of the first embodiment shown in FIG. Here, as in the third embodiment, not only the dot matrix display unit 5b but also the digital display unit 5c will be described.
[0046]
The digital display unit 5c displays the self-sufficiency rate of the in-house power amount during a period from a certain time point to the present time, which is calculated from the accumulated power generation amount and the accumulated power consumption amount. Calculation means (not shown) for calculating the self-sufficiency rate of the electric energy is provided in the display means 5. Then, the display means 5 displays the calculated self-sufficiency rate of the electric energy on the digital display unit 5c.
[0047]
Here, the self-sufficiency rate is calculated by an equation such as self-sufficiency rate [%] = integrated power generation amount [kWh] / integrated power consumption amount [kWh] × 100. For example, the self-sufficiency period may be one day, one week, one month, or one year. As shown in FIG. 9, the dot matrix display unit 5b displays the integrated power generation amount and the integrated power consumption in a graph.
[0048]
Thus, in this embodiment, the calculation means provided in the display means 5 calculates the self-sufficiency rate of the electric energy from the integrated power generation amount and the integrated power consumption amount, and the display means 5 calculates the calculated electric power. Since the amount of self-sufficiency is configured to be displayed on the digital display unit 5c, the dependency (self-sufficiency) of the amount of generated power on the amount of power consumed in the house from a certain point in time is known. For this reason, energy saving consciousness can be raised more.
[0049]
That is, for example, when the self-sufficiency rate period is one day, if the power is well generated on a clear day, the self-sufficiency rate at that time is displayed high. However, power generation stops at night, and the self-sufficiency display value decreases more and more with power consumption due to the use of residential loads. The user can be aware of the power saving by trying to suppress the power consumption as much as possible while seeing the decrease in the self-sufficiency rate.
[0050]
Embodiment 6 FIG.
FIG. 10 is a diagram showing each display information on the display screen portion of the display means in the photovoltaic power generation system according to Embodiment 6 of the present invention and an example of the display form. 10, the same reference numerals as those in FIG. 2 denote the same or corresponding parts. Since the system configuration of the photovoltaic power generation system in this embodiment is the same as that of Embodiment 1 shown in FIG. 1, the description thereof is omitted. Further, the configuration of the display means 5 is the same as that of the first embodiment shown in FIG. Here, as in the third embodiment, not only the dot matrix display unit 5b but also the digital display unit 5c will be described.
[0051]
For example, when the display switching means 5f shown in FIG. 2 is operated in the display states of FIGS. 3 to 9, the screen display is changed, and the dot matrix display unit 5b displays a message indicating the operation state of the photovoltaic power generation system. The display is displayed, and the digital display unit 5c displays a numerical value indicating the operation state and operation data of the photovoltaic power generation system, or a code display using alphabets or numerals. The display switching means 5f is provided in the display means 5.
[0052]
Examples of the message display include words and pictograms indicating the operating state of the photovoltaic power generation system such as “power generation”, “stopping”, and “abnormality occurrence”. The operation data includes current generated power, accumulated generated power, and an error code indicating what kind of abnormality is present when an abnormality occurs. These displays may be configured to automatically return to the previous display state after a certain time, for example, after the operation of the display switching means 5f. For example, the display switching means 5f is appropriately operated by manual operation, for example. Thus, it may be configured to return to the display state of the previous state.
[0053]
As described above, in this embodiment, since the operation state and operation data of the photovoltaic power generation system are displayed on the display unit for a certain period of time after the operation of the display switching unit 5f is performed, the power condition in the house is usually obtained. Because it is a monitor, you can always be aware of power savings, and you can check the status of photovoltaic power generation immediately.
[0056]
【The invention's effect】
  The photovoltaic power generation system according to the present invention isGenerated power and power consumption are assigned to the plus / minus side of one of the two-dimensional orthogonal axes with the center as the origin, and sold power and purchased power are assigned to the plus / minus side of the other axis. Since the display dot is displayed so that the display dot extends from the center to the outside as the value increases, the power, the purchased power, the sold power, and the calculated power consumption, for example,The + X axis direction is the direction in which the generated power increases and the power consumption decreases, and the + Y axis direction is the direction in which the power sales power increases (the power purchase power decreases), so whether the power is good or bad depending on the position of the graph It can be easily understood intuitively whether it is in a state, and the user can be made aware of power saving.
[0057]
  Also,According to the inventionSolar power generation systemFor example,The generated power and power consumption are represented by the length of the bar (X-axis, -X-axis direction), and the sold power and purchased power are represented by the position of the bar (Y-axis, -Y-axis direction). Since the status of power generation and consumption can be determined by the length of the bar, and the status of power purchase and sales can be determined by the vertical movement of the bar, it is possible to make it easier to grasp the power status in the house.
[0058]
    Further, in the solar power generation system, the display means is a power trading state.The numbervaluesoBy configuring to have a digital display unit to display, even if the actual power state deviates from the graph area, there is an index display so that the power situation in the house can be grasped.
[0059]
Further, in the solar power generation system, the display unit includes a selection unit that selects any one of the generated power, the power consumption, the power sale power, and the power purchase power, and the display unit displays the selected power. By configuring the value to be displayed on the digital display unit, it is possible to grasp each power value of generated power, consumed power, sold power, and purchased power with specific numerical values. Can raise awareness of labor saving.
[0060]
Further, in the solar power generation system, the display unit includes a power amount self-sufficiency rate calculating unit that calculates a self-sufficiency rate of the power amount from the integrated power generation amount and the integrated power consumption amount, and the display unit calculates By configuring the digital display unit to display the self-sufficiency rate of the generated power amount, the dependency (self-sufficiency rate) of the generated power amount with respect to the power consumption amount in the house from a certain point in time can be known, and thus more power saving Can raise awareness.
[0061]
In the solar power generation system, the display means includes display switching means, and when the display means is operated by the display switching means, the dot matrix display unit operates the solar power generation system. By configuring so as to display the state or operation data, it is possible to immediately confirm the operation state or operation data of the photovoltaic power generation.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a photovoltaic power generation system according to Embodiment 1 of the present invention.
FIG. 2 is a diagram showing a configuration of display means shown in FIG.
FIG. 3 is a diagram showing an example of display information and a display form in the display screen section shown in FIG.
4 is a diagram showing another example of display information and a display form in the display screen section shown in FIG. 2. FIG.
FIG. 5 is a diagram showing each display information of a display screen section of a display means and an example of the display form in the photovoltaic power generation system according to Embodiment 2 of the present invention.
FIG. 6 is a diagram showing each display information on a display screen section of a display means and an example of the display form in the photovoltaic power generation system according to Embodiment 3 of the present invention.
FIG. 7 is a diagram illustrating examples of display information on a display screen unit of a display unit and an example of a display form thereof in a photovoltaic power generation system according to Embodiment 4 of the present invention.
FIG. 8 is a diagram showing another example of display information on the display screen unit of the display means and the display form thereof in the photovoltaic power generation system according to Embodiment 4 of the present invention.
[Fig. 9] Fig. 9 is a diagram illustrating examples of display information on the display screen unit of the display unit in the photovoltaic power generation system according to Embodiment 5 of the present invention and examples of the display forms thereof.
FIG. 10 is a diagram showing an example of each display information on the display screen unit of the display means and its display form in the photovoltaic power generation system according to Embodiment 6 of the present invention.
FIG. 11 is a diagram showing display means in a conventional photovoltaic power generation system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solar cell, 3b Generated electric power measuring means, 5 Display means, 5b Dot matrix display part, 5c Digital display part, 5e Selection means, 5f Display switching means, 6 Commercial power supply (system), 7 Purchasing electric power measurement means.

Claims (6)

In a photovoltaic power generation system that converts the direct current output of a solar cell into alternating current and grids it with a commercial power supply,
Generated power measuring means for measuring the power generated by solar power generation,
Purchased power measuring means for measuring purchased power supplied from a commercial power system ,
A power sale measuring means for measuring the power sale power flowing backward to the commercial power supply system ;
Power consumption calculating means for calculating the power consumption by comparing the generated power with the value of either the electric power sold or the electric power purchased;
Generated power and power consumption are assigned to the plus or minus side of one of the two-dimensional orthogonal axes with the center as the origin, and sold power and purchased power are assigned to the plus or minus side of the other axis. Display means having a dot matrix display for displaying power, purchased power, sold power, and calculated power consumption so that the display dot extends from the center to the outside as the value increases ;
A photovoltaic power generation system characterized by comprising: In a photovoltaic power generation system that converts the direct current output of a solar cell into alternating current and grids it with a commercial power supply,
Generated power measuring means for measuring the power generated by solar power generation,
Purchased power measuring means for measuring purchased power supplied from a commercial power system,
A power sale measuring means for measuring the power sale power flowing backward to the commercial power supply system;
Power consumption calculating means for calculating the power consumption by comparing the generated power with the value of either the electric power sold or the electric power purchased;
Generated power and power consumption are assigned to the plus or minus side of one of the two-dimensional orthogonal axes with the center as the origin, and sold power and purchased power are assigned to the plus or minus side of the other axis. The power and the calculated power consumption are displayed in a bar so that the display dot extends from the center to the outside as the value increases, and the measured power selling power and power purchasing power at the position on the other axis of the bar. Display means having a dot matrix display for displaying to represent;
Solar power generation system characterized by comprising a. 3. The solar power generation system according to claim 1, wherein the display unit further includes a digital display unit that displays a power sales state numerically . 4. 4. The solar power generation system according to claim 3 , wherein the display unit includes a selection unit that selects any one of generated power, power consumption, electric power sold, and electric power purchased, and the display unit is selected. A photovoltaic power generation system, wherein a power value is displayed on the digital display unit. 4. The solar power generation system according to claim 3 , wherein the display unit includes a power amount self-sufficiency rate calculating unit that calculates a self-sufficiency rate of the power amount from the accumulated power generation amount and the accumulated power consumption amount. The solar power generation system, wherein the calculated self-sufficiency rate of the electric energy is displayed on the digital display unit. The solar power generation system according to any one of claims 1 to 5 , wherein the display unit includes a display switching unit, and the display unit displays the dot matrix display unit when the display switching unit is operated. A solar power generation system characterized by displaying an operating state or operation data of the solar power generation system.

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