Photovoltaic power generation system, control method thereof, program, recording medium, and power storage control device

Abstract

To increase a recovery rate or a usage rate of power generated by a power generation device such as a solar power generation panel.SOLUTION: A solar power generation system (2) includes a power generation device (4) that generates power upon receiving at least sunlight, a power storage device (10), a threshold switching unit (threshold generation / switching unit 24) that switches a threshold according to weather information, a generated power determination unit (26, system control unit 18, controller 68) that determines whether an output of power generated by the power generation device is equal to or less than the threshold, and a power storage unit (system control unit 18, output control unit 28, controller 68) that stores the generated power that is equal to or less than the threshold into the power storage device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to storage control of generated power in a solar power generation system. [Background technology]

[0002] Photovoltaic power generation systems use photovoltaic panels that receive sunlight and generate electricity as power generation equipment. Such power generation equipment can generate power output according to the level of solar radiation. In other words, the power generation output is affected by the amount of solar radiation, and the power generation output is affected by decreases and fluctuations in the amount of solar radiation received by the photovoltaic power generation panel on cloudy or rainy days. Even if the power generation output obtained in the weak current range is supplied to a power conditioner, a power supply output that is practically usable cannot be obtained due to the power consumption in the internal circuit of the power conditioner. Regarding such photovoltaic power generation systems, a system is known in which, when the amount of power generated by the solar panel is equal to or less than a predetermined value, the generated power output is stored in a capacitor, and the secondary battery is charged from the capacitor and output (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP2018-129980A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a system (for example, Patent Document 1) in which the weak current output by a solar panel is stored in a capacitor, the stored power is voltage converted by a DC-DC converter, and then charged into a secondary battery, installing a secondary battery separately from the capacitor complicates the system configuration, and there is an issue that the power consumption caused by the voltage conversion of the DC-DC converter reduces the recovery rate of the weak current, just as in the case of converting generated power in the weak current range using a power conditioner. In addition, when switching between an output mode in which the power generated by the photovoltaic panels is supplied to a power conditioner and a storage mode in which the generated power is stored in a capacitor, it is essential to set a threshold value for switching between the two modes. If this threshold value is set to a high level, the stored power increases, but the generated power sent to the power conditioner decreases and the burden on the storage capacitor that constitutes the power storage device increases. If the threshold is set to a low level, there is also the issue that mode switching will occur frequently in the weak current range when the amount of solar radiation received by the solar panel is unstable, such as on cloudy or rainy days, and this mode switching will increase power consumption.

[0005] The present inventors have found that switching the threshold value depending on the weather type, such as sunny, cloudy, or rainy, is effective for recovering (storing) generated power in the weak current range obtained from a solar panel.

[0006] Therefore, an object of the present disclosure is to increase the recovery rate or utilization rate of generated electricity from power generation devices such as solar panels. [Means for solving the problem]

[0007] In order to achieve the above object, according to one aspect of a solar power generation system of the present disclosure, there is provided a solar power generation system including at least a power generation device that receives solar radiation and generates power, a power storage device, a threshold switching unit that switches a threshold value according to meteorological information, and a power generation unit for the power generation device. electric power and a power storage control unit that causes the power storage device to store the generated power that is equal to or less than the threshold. In this solar power generation system, the weather information may further include at least rainy weather information or cloudy weather information, and when the rainy weather information or cloudy weather information is acquired, a threshold value that is higher than that for a clear day may be selected. In this solar power generation system, the meteorological information may further include at least a solar radiation level, and the threshold value selected when the solar radiation level is low may be a higher threshold value than the threshold value selected when the solar radiation level is high. This solar power generation system may further include a weather determination unit that acquires solar radiation information, generates solar radiation pattern information representing a solar radiation trend from the solar radiation information, and determines a weather type from the solar radiation pattern information, and a threshold generation unit that generates the threshold corresponding to the weather type. In this solar power generation system, the stored power of the power storage device is amount The power supply device may further include a stored power output unit that outputs the stored power when the threshold value is exceeded.

[0008] In order to achieve the above object, according to one aspect of a control method for a solar power generation system of the present disclosure, there is provided a control method for a solar power generation system, comprising: a step of switching a threshold value based on meteorological information; Generated electricity The method includes determining whether the generated power is equal to or less than the threshold value, and storing the generated power, which is equal to or less than the threshold value, in a power storage device.

[0009] In order to achieve the above object, according to one aspect of a program of the present disclosure, there is provided a program for causing a computer used in a solar power generation system to execute the program, the program comprising: a function for generating a threshold; a function for switching the threshold based on meteorological information; Generated electricity The computer is caused to execute a function of determining whether the generated power is equal to or less than the threshold, and a function of storing the generated power that is equal to or less than the threshold in a power storage device.

[0010] In this program, the meteorological information may further include solar radiation information, and the computer may be caused to execute a function of acquiring solar radiation pattern information representing a solar radiation trend from the solar radiation information, a function of determining a weather type from the solar radiation pattern information, a function of generating the threshold value, and a function of switching the threshold value depending on the weather type.

[0011] In order to achieve the above object, one aspect of a recording medium of the present disclosure is a recording medium storing any one or more of the program, solar radiation amount pattern information, and threshold information.

[0012] In order to achieve the above object, according to one aspect of a power storage control device for a solar power generation system disclosed herein, there is provided a power generation device that receives at least solar radiation and generates power, electric power and a power storage device that stores at least a weak current level of the power storage control device used in a solar power generation system. The above Power Generation electric power and a power storage control unit that causes the power storage device to store the generated power that is equal to or less than the threshold. Effect of the Invention

[0013] According to the present disclosure, any of the following effects can be obtained. (1) Multiple thresholds corresponding to solar radiation levels are set and these thresholds are switched based on meteorological information. This allows the generated power when the solar radiation level is low to be stored in the storage device, thereby increasing the recovery rate of the generated power. (2) Since the power generated by the weak current is used for storage, the consumption within the system can be reduced and the utilization rate of the generated power can be increased. (3) As a result, since the threshold is set to the generated power below the weak current range, the proportion of generated power that is below the threshold in the weak current range on sunny days is low, and this does not interfere with the power output from the power conditioner. (4) Even if the level of solar radiation fluctuates due to cloudy or rainy weather, a threshold can be set to correspond to this fluctuation. This prevents frequent switching between power supply output and storage output, enabling the realization of a stable power supply system. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing a solar power generation system according to an embodiment; [Diagram 2] FIG. [Diagram 3] FIG. 11 is a diagram showing solar radiation pattern information. [Figure 4] FIG. 13 is a diagram showing a solar radiation pattern / threshold table. [Diagram 5] 11A to 11C are diagrams illustrating solar radiation amount information, solar radiation amount pattern information, and a transition of power generation, and switching of thresholds. [Figure 6] FIG. 4 is a diagram illustrating a power storage control database. [Figure 7] FIG. 2 is a diagram illustrating an example of hardware of a solar power generation system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] <Solar power generation system 2> Fig. 1 shows a solar power generation system 2 according to an embodiment. The configuration shown in Fig. 1 is just an example, and the present disclosure is not limited to such a configuration. This solar power generation system 2 includes a power generation device 4, a generated power detection unit 6, an output switching unit 8, a power storage device 10, a power conditioner 12, a stored power amount monitoring unit 14, a stored power output unit 15, an information input unit 16, an information presentation unit 17, a system control unit 18, and the like.

[0016] The power generation device 4 includes a solar power generation panel, and generates power by receiving at least sunlight. The power generation device 4 obtains power according to the amount of solar radiation received by the solar power generation panel. The generated power detection unit 6 detects the generated power Ps of the power generation device 4 under the control of the system control unit 18, and provides generated power information to the system control unit 18. This system control unit 18 is an example of the power storage control device of the present disclosure. The output switching unit 8 receives output switching information from the system control unit 18, and switches the output destination of the generated power Ps of the power generation device 4 to the power storage device 10 or the power conditioner 12. In other words, if the generated power Ps of the power generation device 4 is equal to or less than the threshold value Pth, the generated power Ps is directed to be stored in the power storage device 10, and if the generated power Ps exceeds the threshold value Pth, it is directed to the power conditioner 12.

[0017] The power storage device 10 is, for example, a power storage device, and mainly receives and stores generated power Ps that is equal to or less than a threshold value Pth. The stored power amount monitoring unit 14 monitors the stored power amount Pcm of the power storage device 10 and provides the stored power amount information to the system control unit 18. The stored power output unit 15 includes a DC-DC converter, an inverter, etc., and under the control of the system control unit 18, receives the stored power Pc of the power storage device 10, and if the stored power amount Pcm is equal to or greater than the power amount threshold Pcmth, converts the stored power into an AC output similar to commercial AC and provides it to the load 20.

[0018] The power conditioner 12 has an inverter function for converting the generated power Ps of the power generation device 4 from DC to AC, a converter function for converting the inverter output into AC output similar to commercial AC, etc. The output of the power conditioner 12 is provided to a load 20. The information input unit 16 is used to input various information such as rated power generation information of the power generation device 4 and rated stored power information of the storage device 10. The information presentation unit 17 presents presentation information including meteorological information (including weather forecast information), solar radiation amount pattern information, threshold information, generated power information, output information, stored power information, and other control information in a timely manner.

[0019] The system control unit 18 is composed of, for example, a computer equipped with a communication function, and includes functional units realized by information processing, such as a weather information acquisition unit 21, a weather information processing unit 22, a weather judgment unit 23, a threshold generation / switching unit 24, a generated power information acquisition unit 25, a generated power judgment unit 26, an output control unit 28, an information presentation control unit 29, and a stored power output control unit 30. The weather information acquisition unit 21 acquires weather information from a weather information source 31 such as a meteorological satellite, and acquires solar radiation amount information 32 (FIG. 2) contained in the weather information. The meteorological information processing unit 22 processes the insolation amount information 32 by, for example, extracting insolation amount pattern information 33 (FIG. 3) that indicates an insolation amount pattern from the meteorological information, and performing information processing such as simplifying the insolation amount pattern information 33. The weather determination unit 23 acquires the solar radiation amount pattern information 33, determines the weather type, such as fine weather, cloudy weather, rainy weather, etc., from the solar radiation amount level, and generates weather type information representing this weather type.

[0020] The threshold generation / switching unit 24 refers to the solar radiation amount information and the power generation power information representing the power generation power Ps, generates a plurality of thresholds Pth corresponding to the weather types, and switches the thresholds Pth. The solar radiation amount information is included in the weather information acquired by the weather information acquisition unit 21. The power generation power information is the power information acquired by the power generation power information acquisition unit 25. That is, the threshold generation / switching unit 24 is a threshold generation unit and an example of a threshold switching unit, generates a threshold Pth representing the weak power region Psmz of the power generation power Ps, and switches the value of this threshold Pth according to the solar radiation amount level. In the weather information, weather types such as sunny, cloudy, and rainy are defined as follows. Sunny: It represents a clear sky with almost no clouds, or a sunny day where the solar radiation amount does not fluctuate significantly even if clouds exist, and a weather condition where sufficient solar radiation amount can be obtained. That is, the ratio occupied by the weak power region Psmz of the power generation power Ps is small. Cloudy: It represents an unstable weather condition where clouds are dominant, such as the solar radiation amount obtained from between clouds being unstable due to the flow of clouds. That is, the ratio occupied by the weak power region Psmz with respect to the power generation power Ps is large, and the weak power region Psmz is dominant with respect to the power generation power Ps. Rainy: It represents a state with continuous rainfall and a low solar radiation amount level. That is, the weak power region Psmz is almost all of the power generation power Ps, and the power generation power Ps = the weak power region Psmz.

[0021] Then, the threshold generation / switching unit 24 generates solar radiation amount pattern information 33 representing sunny, cloudy, and rainy, and generates, for example, a threshold Pth1 corresponding to sunny, a threshold Pth2 corresponding to cloudy, and a threshold Pth3 corresponding to rainy as thresholds Pth with different levels for each solar radiation amount pattern information 33. And the levels of the respective thresholds Pth1, Pth2, and Pth3 are set to Pth1 < Pth2 < Pth3 in order to increase the recovery rate of the weak power region Psmz of the power generation power Ps. That is, corresponding to the weather information in which the weak power region Psmz becomes dominant, the thresholds Pth2 and Pth3 are set to higher levels with respect to the level of the threshold Pth1. These thresholds Pth1, Pth2, and Pth3 are selected based on the acquired weather information. If fine weather information is acquired, threshold Pth1 is selected. If cloudy weather information is acquired, threshold Pth2 is selected. If rainy weather information is acquired, threshold Pth3 is selected.

[0022] The generated power information acquiring unit 25 acquires the detection output of the generated power detecting unit 6, and acquires generated power information that indicates the generated power of the power generating device 4 in operation. The generated power determination unit 26 receives generated power information from the generated power information acquisition unit 25, and acquires threshold information from the threshold generation / switching unit 24. The generated power determination unit 26 compares the generated power Ps of the operating power generation device 4 with a threshold Pth (=Pth1, Pth2 or Pth3) that is currently set, determines whether the current generated power Ps is equal to or less than the threshold Pth, and generates determination information that indicates the determination result. The output control unit 28 acquires the determination information from the generated power determination unit 26, and generates output switching information based on this determination information. This output switching information is provided to the output switching unit 8. Upon receiving this output switching information, the output switching unit 8 switches the output. That is, if the generated power Ps satisfies Ps≦Pth1, Ps≦Pth2, or Ps≦Pth3, it is directed to the power storage device 10, and if Ps>Pth1, Ps>Pth2, or Ps>Pth3, it is directed to the power conditioner 12.

[0023] The information presentation control unit 29 acquires weather information from the weather information acquisition unit 21, solar radiation pattern information 33 from the weather information processing unit 22, threshold information from the threshold generation / switching unit 24, generated power information from the generated power information acquisition unit 25, judgment information from the generated power judgment unit 26, output information from the output control unit 28, and stored power output information from the stored power output control unit 30, or acquires other control information, generates presentation information, and outputs this presentation information to the information presentation unit 17. The stored power output control unit 30 acquires monitoring information from the stored power amount monitoring unit 14, and uses this monitoring information to monitor whether the stored power amount Pcm of the power storage device 10 has reached the power amount threshold Pcmth, and generates output control information based on the result. When the stored power amount Pcm of the power storage device 10 has reached the power amount threshold Pcmth or more (Pcm≧Pcmth), the stored power output unit 15 that has received this output control information passes the stored power Pc of the power storage device 10 and supplies it to the load 20.

[0024] <Control process of the system control unit 18> The system control unit 18 includes the previously described weather information acquisition unit 21, weather information processing unit 22, weather judgment unit 23, threshold generation / switching unit 24, generated power information acquisition unit 25, generated power judgment unit 26, output control unit 28, information presentation control unit 29, and stored power output control unit 30, and executes a number of control processes. These control processes include: (1) Generation of threshold Pth (2) Output switching control of generated power Ps (3) Output control of stored power Pc (4) Obtaining weather information (5) Processing of meteorological information (6) Database of control information This includes processes such as:

[0025] <Process for generating threshold value Pth> The process of generating the threshold value Pth is an example of a control method or a program for a photovoltaic power generation system according to the present disclosure. The process of generating the threshold value Pth includes obtaining power generation information (S101), obtaining weather information (S102), processing the weather information (S103), calculating the threshold value Pth (S104), setting or revising the threshold value Pth (S105), and presenting information (S106). Acquisition of generated power information (S101): When the system control unit 18 is started, the system control unit 18 is initialized and acquires generated power information indicating the generated power Ps of the power generation device 4 from the information input unit 16.

[0026] Obtaining weather information (S102): After the system control unit 18 is started up, it connects to the weather information source 31 by wire or wirelessly, and the weather information acquisition unit 21 acquires weather information from the weather information source 31. Processing of weather information (S103): The weather information processor 22 acquires solar radiation amount information S from the weather information, processes the solar radiation amount information S to process solar radiation amount pattern information Sg, and performs processing such as simplifying the solar radiation amount pattern information Sg.

[0027] Calculation of threshold value Pth (S104): A weak current power Pmz (FIG. 5) is extracted from the generated power Ps obtained by the power generation device 4 based on the amount of solar radiation obtained in each weather condition of fine weather, cloudy weather, or rainy weather, and the magnitude of the threshold value Pth is calculated using this power. In order to recover the weak current power Pmz at different levels depending on whether it is fine weather, cloudy weather, or rainy weather, the threshold value Pth1 is calculated for fine weather, the threshold value Pth2 for cloudy weather, and the threshold value Pth3 for rainy weather (FIG. 5).

[0028] Setting or revising threshold value Pth (S105): Based on the weather information for the next day acquired at least on the previous day together with the calendar information, one of threshold values ​​Pth1, Pth2, Pth3 is set in power generation power determination unit 26, or the set threshold value Pth1, Pth2, or Pth3 is revised to one of threshold values ​​Pth1, Pth2, Pth3 based on the weather information. In this case, if the weather type predicted by the weather information is the same, the same threshold value Pth is maintained.

[0029] Presentation of information (S106): The information presentation control unit 29 generates presentation information from the weather information, processed weather information information (solar radiation pattern information and simplified information thereof), threshold information, and information representing the settings or revisions thereof, and outputs it to the information presentation unit 17.

[0030] <Output switching process of generated power Ps> The output switching control of the generated power Ps is an example of a control method or a program thereof for a photovoltaic power generation system according to the present disclosure. This output switching control process selects whether the generated power Ps is to be stored by the power storage device 10 or used by the power conditioner 12. This output switching control includes monitoring the operation of the power generation device 4 (S201), determining whether the power generation device 4 is operating (S202), acquiring information on the generated power (S203), determining the generated power Ps (S204), comparing the generated power Ps with a threshold value Pth (=Pth1, Pth2, or Pth3) (S205), storing the power storage device 10 (S206), supplying the power to the power conditioner 12 (S207), and presenting information (S208). In other words, the power storage control according to the present disclosure includes the processes of S201, S202, S203, S204, S205, S206, and S208.

[0031] Monitoring operation of power generation device 4 (S201): The system control unit 18 receives the detection output of the generated power detection unit 6, and the generated power information acquisition unit 25 acquires operation information of the power generation device 4 from this detection output, and monitors the operation of the power generation device 4. Determining whether the power generation device 4 is operating (S202): The system control unit 18 determines whether the power generation device 4 is operating or not based on the detection output of the generated power detection unit 6. If the power generation device 4 is not operating, the storage control of the generated power Ps is stopped. Acquisition of generated power information (S203): If the power generation device 4 is operating, the generated power information acquisition unit 25 acquires generated power information indicating the current generated power Ps of the power generation device 4.

[0032] Determination of generated power Ps (S204): The generated power determination unit 26 acquires generated power information from the generated power information acquisition unit 25, and determines the current generated power Ps. Comparing the generated power Ps with the threshold value Pth (=Pth1, Pth2 or Pth3) (S205): The generated power Ps is determined using the current generated power Ps and the threshold value Pth, that is, the threshold value Pth is any one of the threshold values ​​Pth1, Pth2 or Pth3.

[0033] Storing power in the power storage device 10 (S206): If the generated power Ps is equal to or less than the threshold value Pth1, the generated power Ps is in the weak current region Psmz1; if the generated power Ps is equal to or less than the threshold value Pth2, the generated power Ps is in the weak current region Psmz2; if the generated power Ps is equal to or less than the threshold value Pth3, the generated power Ps is in the weak current region Psmz3. Therefore, the generated power Ps=Psmz1, Psmz2 or Psmz3 is directed to be stored in the power storage device 10. Supply to power conditioner 12 (S207): If the generated power Ps exceeds the threshold value Pth1, the threshold value Pth2, or the threshold value Pth3, the generated power Ps is directed to the power conditioner 12 for power output.

[0034] Presentation of information (S208): The information presentation control unit 29 acquires operation information, generated power information, judgment information, output information, etc. of the power generation device 4, generates presentation information, provides it to the information presentation unit 17, and presents this information.

[0035] <Monitoring of stored power amount Pcm and output control process of stored power Pc> The output control process of the stored power Pc is an example of a control method or a program for a photovoltaic power generation system according to the present disclosure. This output control process of the stored power Pc is monitoring the amount of stored power Pcm, controlling the timing of use, etc. This output control includes monitoring the amount of stored power Pcm (S301), acquiring information on the amount of stored power (S302), determining the amount of stored power Pcm (S303), comparing the amount of stored power Pcm with a power amount threshold Pcmth (S304), sending the stored power Pc (S305), presenting information (S306), etc. Monitoring of stored power amount Pcm (S301): The system control unit 18 monitors the stored power amount Pcm of the power storage device 10 using the stored power amount monitoring unit 14 and the stored power output control unit 30. Acquisition of stored power amount information (S302): The stored power output control unit 30 continuously or discontinuously acquires transition information of the stored power amount Pcm from the stored power amount monitoring unit 14.

[0036] Determination of stored power amount Pcm (S303): The stored power output control unit 30 determines whether the stored power amount Pcm can be output or whether storage should be continued. Comparison between the stored power amount Pcm and the power amount threshold Pcmth (S304): The stored power output control unit 30 compares the current stored power amount Pcm with the power amount threshold Pcmth, and determines whether Pcm ≥ Pcmth or Pcm < Pcmth. Transmission of the stored power Pc (S305): If Pcm ≥ Pcmth, the stored power output unit 15 is operated. The stored power output unit 15 receives the stored power Pc from the energy storage device 10, and converts it into, for example, an AC output similar to commercial AC and outputs it. Presentation of information (S306): The information presentation control unit 29 receives stored power information, output control information, etc. from the stored power output control unit 30, generates presentation information representing the transition and utilization of the stored power Pc, and presents it to the information presentation unit 17.

[0037] <Obtaining weather information> FIG. 2 shows solar radiation amount information 32 representing the transition of the solar radiation amount over time, with time on the horizontal axis and the solar radiation amount [MJ / m 2 on the vertical axis. This solar radiation amount information 32 is electronic information provided from a public weather information source 31 such as a meteorological satellite. This solar radiation amount information 32 (S) is an example of weather information. For example, it shows the solar radiation amount information S for 12 months in the Tokyo area, and includes a plurality of solar radiation amount curves S1, S2, ···, SN. Each solar radiation amount curve S1, S2, ···, SN shows the transition of the predicted solar radiation amount for each month as an example. The intermediate plot points have the solar radiation amount information 32 set for each time, and can be developed on the analysis program to the information presentation unit 17. By clicking on the plot points of the solar radiation amount curves S1, S2, ···, SN, the solar radiation amount information 32 at the selected time can be developed and the information can be received. The illustrated solar radiation amount curves S1, S2, ···, SN are information representing weather predictions. In sunny, cloudy or rainy days, the solar radiation amount level decreases, and for example, the highest level at 12:00 noon of the solar radiation amount curves S1, S2, ···, SN changes. With respect to the amount of solar radiation that changes according to the solar radiation curves S1, S2, ..., SN, the power generation device 4 obtains a power generation electric power Ps having a level corresponding to the amount of solar radiation. That is, on a fine day, the amount of solar radiation is high and the power generation electric power Ps increases. In contrast, on a cloudy day, the amount of solar radiation decreases or fluctuates, the power generation electric power Ps decreases, and the weak current region Psmz becomes dominant. Also, on a rainy day, the amount of solar radiation decreases further and the power generation electric power Ps attenuates into the weak current region Psmz.

[0038] <Processing of weather information> FIG. 3 shows solar radiation amount information S (32), solar radiation amount pattern information Sg (33) and grouping thereof. In this example, when the maximum point pmax of the amount of sunlight at 12 a.m. is taken as the amount of sunlight at the sunlight curves S1, S2, ..., S12 extracted from the sunlight information 32 (Fig. 2), and lines are drawn connecting the maximum point pmax and the minimum points Pmin of the amount of sunlight at sunrise and sunset, a triangle is formed with the time axis as the base. In other words, the sunlight curves S1, S2, ..., S12 are patterned with triangles that represent the characteristics of the sunlight curves, and sunlight pattern information Sg1, Sg2, ..., Sg12 can be obtained. When the solar radiation pattern information Sg1, Sg2, ..., Sg12 is superimposed on the solar radiation curve S1 for one year, as shown in FIG. 3, it can be patterned into a collection of a high solar radiation group Gh (=Sg3, Sg4, Sg5, Sg6, Sg7, Sg8, Sg9) from March to September when the solar radiation is high, and a low solar radiation group Gs (=Sg10, Sg11, Sg12, Sg1, Sg2) from October to February. In other words, the solar radiation pattern information 33 (Sg) is divided into two groups, and the solar radiation pattern information 33 is simplified as characteristic solar radiation information. The characteristic items of the solar radiation pattern information 33 (Sg) include characteristic quantities such as the height h, area, and angle of the solar radiation of the triangle. The acquisition of the solar radiation amount information 32 (S) and the solar radiation amount pattern information 33 (Sg) and the simplification process are realized by the information processing of the system control unit 18.

[0039] <Solar radiation pattern threshold table 34> FIG. 4 shows a solar radiation pattern / threshold table 34 indicating the relationship between solar radiation information S, solar radiation pattern information Sg, weather type information, and thresholds Pth1, Pth2, and Pth3. In this solar radiation pattern / threshold table 34, a group information section 36, a solar radiation amount information section 38, a weather type information section 40, and a threshold information section 42 are set. The group information section 36 stores and presents group information G1 representing the high solar radiation group Gh and group information G2 representing the low solar radiation group Gs described above. The sunlight information unit 38 presents sunlight pattern information Sg1L, Sg2L on fine days, sunlight pattern information Sg1N, Sg2N on cloudy days, and sunlight pattern information Sg1S, Sg2S on rainy days as sunlight information S11, S21 for each group information G1, G2.

[0040] In group information G1, the amount of insolation is high on a fine day, so the insolation pattern information Sg1L indicates an insolation level that reflects the amount of insolation. On a cloudy day, the amount of insolation is unstable and low, so the insolation pattern information Sg1N is shown, and on a rainy day, the amount of insolation is low, so the insolation pattern information Sg1S is shown. In group information G2, the amount of insolation is lower than in group information G1, but since the amount of insolation is high on a sunny day like in group information G1, the insolation pattern information Sg2L indicates an insolation level that reflects the amount of insolation. Since the amount of insolation is unstable and low on a cloudy day, the amount of insolation is unstable and low, and in rainy weather the amount of insolation is low and reflected in the insolation pattern information Sg2N. The weather type information section 40 presents weather type information indicating fine weather, cloudy weather, and rainy weather as weather types. In the threshold information section 42, thresholds Pth1, Pth2, and Pth3 are presented as threshold information for each of the solar radiation pattern information Sg1L, Sg2L, Sg1N, Sg2N, Sg1S, and Sg2S.

[0041] <Changes in solar radiation amount information S, solar radiation amount pattern information Sg, and generated power Ps, and switching of thresholds Pth1, Pth2, and Pth3>

[0042] <On a clear day> On a clear day, the threshold Pth is switched to the lowest level threshold Pth1. FIG. 5A shows a solar radiation curve S1 for fine weather extracted from the solar radiation information of group information G1, and illustrates the corresponding solar radiation pattern information SgL, generated power Ps1, and threshold value Pth1. The solar radiation curve S1 shows the change in the amount of solar radiation from sunrise to sunset on a clear day. The solar radiation amount pattern information SgL is pattern information that represents a solar radiation amount pattern that linearly approximates the transition of the solar radiation amount.

[0043] The generated power Ps1 is generated power information indicating a change in the generated power Ps of the power generation device 4. The generated power Ps1 is a level of power corresponding to the level of solar radiation. In the generated power Ps1, the generated power Ps is in a weak current region Psmz1 from time t1 to t2, a high current region Ph1 from time t2 to t3, and a weak current region Psmz1 from time t3 to t4. The threshold value Pth1 is set to a level for clearly distinguishing the weak current region Psmz1 from the high current region Ph1, and since the high current region Ph1 is dominant on a fine day, the threshold value Pth1 is set to a low level. The same can be said when information on the amount of solar radiation on a fine day is extracted from group information G2.

[0044] <On cloudy days> On cloudy days, in order to recover the unstable generated power Ps, the threshold value Pth is switched to a medium level threshold value Pth2. FIG. 5B shows the solar radiation curve S2 for cloudy days extracted from the solar radiation information of the group information G1, and the corresponding solar radiation pattern information SgN, generated power Ps2, and threshold value Pth2. The solar radiation curve S2 shows the change in the amount of solar radiation from sunrise to sunset on a cloudy day. The solar radiation amount pattern information SgN is pattern information that represents a solar radiation amount pattern that linearly approximates the change in the solar radiation amount on a cloudy day. The generated power Ps2 is generated power information indicating the transition of the generated power Ps of the power generation device 4. The generated power Ps2 is a level of power corresponding to the level of solar radiation on a cloudy day. In the generated power Ps2, the generated power Ps obtained from sunrise to sunset is dominated by the weak current region Psmz2, and the high current region Ph2 is intermittent in the time period from time t5 to time t6 (around 12:00 a.m.). The threshold value Pth2 is set to a level for clearly distinguishing the weak current region Psmz2 from the high current region Ph2, and since the weak current region Psmz2 is dominant on cloudy days, the level of the threshold value Pth2 is set higher than the threshold value Pth1. The same can be said when solar radiation information on cloudy days is extracted from group information G2.

[0045] <In rainy weather> During rainy weather, in order to recover the generated power Ps in the weak current range, the threshold value Pth is switched to the highest level threshold value Pth3. FIG. 5C shows a solar radiation curve S3 for rainy weather extracted from the solar radiation information of group information G1, and illustrates the corresponding solar radiation pattern information SgS, generated power Ps3, and threshold value Pth3. The solar radiation amount curve S3 shows the change in the amount of solar radiation from sunrise to sunset when it is raining. The solar radiation amount pattern information SgS is pattern information that represents a solar radiation amount pattern that linearly approximates the change in the solar radiation amount in rainy weather. The generated power Ps3 is generated power information indicating the transition of the generated power Ps of the power generation device 4. This generated power Ps3 is obtained at a level corresponding to the level of solar radiation in rainy weather. In this generated power Ps3, the generated power Ps3 obtained from sunrise to sunset is entirely in the weak current region Psmz3, and does not include the high current region Ph. The threshold value Pth3 is set to a level for capturing the weak current region Psmz3, and in rainy weather, the level of the threshold value Pth3 for the weak current region Psmz3 is set higher than the threshold value Pth2. The same can be said when solar radiation information on cloudy days is extracted from group information G2.

[0046] <Control Information Database 44> 6 shows an example of the control information database (DB) 44. This control information DB 44 stores control information used mainly for power storage control of the generated power Ps of the power generation device 4. This control information DB 44 includes a control information file 46. The control information file 46 includes a meteorological information section 48 , an insolation pattern information section 50 , a generated power information section 52 , a threshold information section 54 , a stored power information section 56 , a power threshold information section 58 , and a history information section 60 .

[0047] The meteorological information section 48 stores meteorological information acquired from the meteorological information source 31. The meteorological information section 48 includes a date and time information section 48-1, a sunshine duration information section 48-2, a solar radiation amount information section 48-3, and a weather type information section 48-4. The date and time information section 48-1 stores date and time information indicating the date and time related to the weather forecast. The sunshine hours information section 48-2 stores information related to sunshine, such as sunrise time, sunset time, and sunshine hours. The solar radiation information section 48-3 stores solar radiation information indicating the amount of solar radiation. The weather type information section 48-4 stores type information indicating the weather type, such as sunny, cloudy, rainy, typhoon, and sunshine fluctuation.

[0048] The solar radiation pattern information section 50 stores solar radiation pattern information that represents a solar radiation pattern obtained by linear approximation of the solar radiation information acquired from the solar radiation information section 48-3. The generated power information section 52 stores generated power information that indicates the generated power Ps of the power generation device 4. This generated power information section 52 has a rated section 52-1 and an operation section 52-2. The rated section 52-1 stores power information that indicates the rated generated power of the generated power Ps of the power generation device 4. The operation section 52-2 stores power information that indicates the generated power Ps when the power generation device 4 is in operation. The threshold information unit 54 stores threshold information representing the thresholds Pth1, Pth2, Pth3, etc. generated by the threshold generating / switching unit 24 for each weather type. The stored power information section 56 stores stored power information indicating the amount of stored power in the power storage device 10. The power amount threshold information unit 58 stores power amount threshold information that indicates a power amount threshold that serves as a criterion for determining whether or not to output the stored power amount of the power storage device 10. The history information section 60 stores history information such as information storage history, and storage or output history of stored power.

[0049] <Hardware of Solar Power Generation System 2> Fig. 7 shows an example of hardware of the solar power generation system 2. This hardware is an example of the present disclosure, and the present disclosure is not limited to such disclosure. In Fig. 7, the same reference numerals are used to denote parts common to the solar power generation system 2 shown in Fig. 1. The solar power generation panel 62 is an example of the power generation device 4. The generated power Ps of the solar power generation panel 62 is supplied to a power conditioning circuit 66-1 and a power storage circuit 66-2 through a router 64. The router 64 has the function of the generated power detection unit 6 described above, and for example, judges at one-second intervals whether the generated power Ps is in the weak current range or not, and provides the judgment information to a controller 68. The controller 68 is an example of the system control unit 18 described above.

[0050] A power conditioner 12 is installed in the power conditioning circuit 66-1, and a switch 70-1 is installed between this power conditioner 12 and the router 64. The opening and closing of the switch 70-1 is controlled by a controller 68, and if the generated power Ps is not in the weak current region, the generated power Ps is directed to the power conditioner 12. The power conditioner 12 receives the generated power Ps, performs processing such as stabilizing the DC power and converting the DC to AC, and outputs an AC output similar to commercial AC through an output unit 72, which is supplied to the loads 20-1, 20-2, etc. The power storage circuit 66-2 is provided with a power storage device 10, and a switch 70-2 is provided between the power storage device 10 and the router 64. The opening and closing of the switch 70-2 is controlled by a controller 68, and if the generated power Ps is in the weak current range, the generated power Ps is directed to the power storage device 10 and stored therein.

[0051] The stored energy Pcm of the energy storage device 10 is monitored by a stored energy monitoring unit 14. The stored energy monitoring unit 14 detects the stored power, calculates the time lapse, and calculates the stored energy, and when the stored energy reaches a stored energy threshold or more, this monitoring information is provided to a controller 68. The opening and closing of a switch 70-3 is controlled by the controller 68, and the stored power is output through a stored energy output unit 15. A DC-DC converter 74 and an inverter 76 are installed in the storage power output unit 15. The DC-DC converter 74 performs voltage conversion and stabilization of the DC output of the storage device 10, and the inverter 76 converts the DC output into an AC output and supplies the AC output similar to commercial AC to the loads 20-1, 20-2, etc.

[0052] The controller 68 is composed of a computer having a communication function, a calendar function, etc. The controller 68 includes a processor 78, a storage unit 80, an input / output unit (I / O) 82, a timer 84, a communication unit 86, and switch drive units 88-1, 88-2, and 88-3. The processor 78 executes an OS (Operating System), a photovoltaic power generation output control program, a power storage control program, and the like stored in the memory unit 80, and performs various information processing, as well as opening / closing control of the switches 70-1, 70-2, and 70-3 and drive control of the functional units. The storage unit 80 is an example of a recording medium that stores the programs and information of the present disclosure. The storage unit 80 is composed of storage elements such as a ROM (Read-Only Memory) and a RAM (Random-Access Memory), and stores information such as an OS, programs, the solar radiation amount / threshold value table 34, and a control information DB 44 under the control of the processor 78.

[0053] Under the control of the processor 78, the I / O 82 receives input information such as weak current detection information from the router 64 and stored power amount monitoring information, and outputs control information for the switches 70-1, 70-2, and 70-3. The timer 84 generates crosscheck pulses and time information under the control of the processor 78. This time information can be used as the basis for the timing of detecting a weak current in the router 64 and the interval between opening and closing the switches 70-1 and 70-2. Under the control of the processor 78, the communication unit 86 communicates with the weather information source 31 at regular intervals, such as every 24 hours, to obtain weather information.

[0054] The information input unit 16 is used to input information required for controlling the rated power of the solar power generation panel 62 under the control of the processor 78. In addition to a keyboard, the information input unit 16 may be a user interface such as a touch panel installed on the presentation screen of the information presentation unit 17. The information presenting unit 17 uses an LCD (Liquid Crystal Display) panel to present the above-mentioned presentation information.

[0055] <Effects of the embodiment> According to the embodiment described above, any one of the following effects can be obtained. (1) According to this embodiment, weather information is obtained from the weather information source 31, solar radiation pattern information Sg is obtained, and the weather type, such as sunny, cloudy, rainy, etc., can be determined as weather forecast information from its form, and this can be used to switch the threshold value. (2) According to this embodiment, a threshold value having a level for recovering the weak current range of the generated power can be generated using solar radiation pattern information Sg and power information representing the generated power Ps, and this threshold value can be set. (3) The level of the threshold Pth is set to a low level when the weather is fine, a medium level when the weather is cloudy, and a high level when the weather is rainy, and these levels are switched based on meteorological information. This increases the recovery rate of generated power through storage in the power storage device 10. (4) Since the threshold level is set higher on rainy or cloudy days than on sunny days, the frequency of switching between power supply by the power conditioner 12 and storage by the power storage device 10 can be reduced, and power consumption within the system can be suppressed, thereby improving the power recovery rate and utilization rate. (5) The amount of stored power Pcm of the power storage device 10 is monitored, and when the amount of stored power Pcm exceeds the power amount threshold Pcmth, the stored power Pc is drawn, so that the utilization rate of the stored power Pc can be increased. (6) In this photovoltaic power generation system 2, various information showing the progress of control or the control results is presented in a timely manner on the information presenting unit 17, so that the user can easily recognize the control state and the acquired information. (7) Since the power generated by the solar panel 62 can be extracted and stored with high precision, the utilization of solar energy and the like can be improved.

[0056] Other Embodiments (1) Setting the threshold Pth level In the above embodiment, three threshold levels are set corresponding to the weather types of sunny, cloudy, and rainy, but it is also possible to set two levels representing stable weather conditions such as sunny and unstable weather conditions such as cloudy and rainy, and switch between them. (2) Switching the threshold Pth The threshold value Pth may be changed according to the acquisition timing of the weather information or on a daily basis in conjunction with the weather information, or may be changed according to the weather type on the forecast day. The threshold value Pth may also be adjusted to a continuous level. (3) Timing of determining power generation Ps The system obtains generated power information, monitors the generated power Ps at regular intervals, such as every second, and determines whether to supply power or store it. However, this determination timing may be switched depending on the weather type, such as prioritizing power supply on sunny days and prioritizing storage on cloudy or rainy days.

[0057] As described above, the most preferred embodiment of the present disclosure has been described. The present disclosure is not limited to the above description. Based on the gist of the present disclosure described in the claims or disclosed in the form for carrying out the present disclosure, various modifications and changes are possible for those skilled in the art. It goes without saying that such modifications and changes are included in the scope of the present disclosure. [Industrial Applicability]

[0058] According to the present disclosure, multiple thresholds corresponding to solar radiation levels are switched based on weather information, and it is determined whether the power generation output of a power generation device including a solar power generation panel is below the threshold, and the generated power below the threshold is stored in a power storage device, thereby increasing the recovery rate or utilization rate of power generated by power generation devices such as solar power generation panels. [Explanation of symbols]

[0059] 2. Solar power generation system 4. Power generation equipment 6 Power generation output detection section 8 Output switching section 10. Energy storage device 12 Power conditioner 14. Storage energy monitoring unit 15 Storage power output section 16 Information input section 17 Information presentation section 18 System Control Unit 20, 20-1, 20-2 Load 21 Weather Information Acquisition Department 22 Weather Information Processing Department 23 Weather Judgment Department 24 Threshold generation and switching section 25 Power generation information acquisition unit 26 Power generation determination unit 28 Output control section 29 Information presentation control unit 30 Storage power output control unit 31 Weather Information Sources 32 Solar radiation information 33. Sg solar radiation pattern information 34 Solar radiation pattern threshold table 36 Group Information Department 38 Solar radiation information department 40 Weather Information Division 42 Threshold information section 44 Control Information Database 46 Control Information File 48 Meteorological Information Department 48-1 Date and Time Information Section 48-2 Sunshine Hours Information Section 48-3 Solar radiation information department 48-4 Weather Information Section 50 Solar radiation pattern information section 52 Power Generation Information Department 52-1 Rating section 52-2 Working section 54 Threshold information section 56 Storage Energy Information Section 58 Power consumption threshold information section 60 History Information Section 62 Solar panels 64 Router 66-1 Power conditioning circuits 66-2 Energy storage system circuit 68 Controller 70-1, 70-2, 70-3 Switch 72 Output section 74 DC-DC Converter 76 Inverter 78 Processors 80 Storage section 82 Input / output section (I / O) 84 Timer 86 Communications Department 88-1, 88-2, 88-3 Switch drive unit

Claims

1. A power generation device that generates power by receiving at least solar radiation; A power storage device; A threshold switching unit that switches the threshold value according to weather information; a generated power determination unit that determines whether the generated power of the power generation device is equal to or less than the threshold value; a power storage control unit that causes the power storage device to store the generated power that is equal to or less than the threshold value; A solar power generation system comprising:

2. The photovoltaic power generation system according to claim 1 , further comprising: a threshold value that is higher than that for a clear day when the weather information includes at least rainy weather information or cloudy weather information and the rainy weather information or cloudy weather information is acquired.

3. 3. The solar power generation system according to claim 1, further comprising: a threshold value selected when the solar radiation level is low, the threshold value being a higher level than the threshold value selected when the solar radiation level is high.

4. a weather determination unit that acquires solar radiation information, generates solar radiation pattern information representing a solar radiation tendency from the solar radiation information, and determines a weather type from the solar radiation pattern information; a threshold value generating unit that generates the threshold value corresponding to the weather type; The solar power generation system according to any one of claims 1 to 3, comprising:

5. 5. The solar power generation system according to claim 1, further comprising a stored power output unit that outputs the stored power when the stored power of the power storage device exceeds an electric power amount threshold value.

6. A method for controlling a solar power generation system, comprising: A step of switching the threshold value according to weather information; determining whether the generated power is equal to or less than the threshold; storing the generated power equal to or less than the threshold value in a power storage device; A method for controlling a solar power generation system comprising:

7. A program for causing a computer used in a solar power generation system to execute the program, A function for generating a threshold value; A function of switching the threshold value according to weather information; A function of determining whether the generated power is equal to or less than the threshold value; a function of storing the generated power equal to or less than the threshold value in a power storage device; A program for causing the computer to execute the above.

8. Further, the meteorological information includes solar radiation information, and a function of acquiring solar radiation pattern information indicating a solar radiation tendency from the solar radiation information; A function of determining a weather type from the solar radiation pattern information; generating said threshold value; A function of switching a threshold value according to the weather type; The program according to claim 7, for causing the computer to execute the steps of:

9. 9. A recording medium storing any one or more of the program, the solar radiation amount pattern information, and the threshold value information according to claim 7 or 8.

10. A power storage control device for use in a solar power generation system, comprising: a power generation device that generates power by receiving at least solar radiation; and a power storage device that stores at least a weak current level of the power generated by the power generation device, a power generation determination unit that switches a threshold value based on meteorological information and determines whether the power generation of the power generation device is equal to or lower than the threshold value; a power storage control unit that causes the power storage device to store the generated power that is equal to or less than the threshold value; A storage control device for a solar power generation system comprising:

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