JP5288157B2 - Photovoltaic power generation device using dye-sensitized solar cell - Google Patents

Description

  The present invention relates to a solar power generation device using a dye-sensitized solar cell.

  In recent years, a power generation system using a solar cell as a power source has attracted attention from the viewpoint of environmental problems and energy problems. In particular, solar cells currently in practical use are mainly formed using PN junctions using single crystal silicon, polycrystalline silicon, amorphous silicon, or the like. These solar cells have little maintenance, and it is possible to obtain electric power as long as the solar cells have sunshine, but the electric power greatly affects the amount of solar radiation. For this reason, a technique related to a maximum output power control method for photovoltaic cells has been disclosed so far, which aims to efficiently extract power from solar cells (for example, Patent Document 1).

  The maximum output power method of the photovoltaic cell described in Patent Document 1 employs a so-called maximum power tracking method called a hill-climbing method. In this method, when the operating point voltage of the solar cell is increased or decreased at regular time intervals and the output power of the solar cell increases, the operating point voltage is further changed in the same direction, When the output power decreases, the operating point voltage is changed in the reverse direction. As described above, the maximum output power control method of the photovoltaic cell described in Patent Document 1 compares the previous output power with the current output power and moves the operating point voltage so that a larger output power is obtained. Control is performed so that power can be generated near the maximum power point. However, in the maximum power control method for a photovoltaic cell described in Patent Document 1, since the operating point is always changed near the maximum power, a power loss always occurs.

  There is also a technique for reducing power loss by switching between a mode for searching for the maximum power operating point by changing the operating voltage and a mode for holding the operating voltage to perform maximum power tracking control (for example, patents). Reference 2).

  In the maximum power tracking control method described in Patent Document 2, first, it is determined from the comparison result between the current output power and the output power at the time of previous sampling whether or not it is operating near the maximum output operating point. When it is determined that the operation is not performed near the power output operation point, the maximum output operation point is searched by changing the operation target operation voltage. By performing the control as described above, the target operating voltage is always kept constant when the operating voltage of the solar cell reaches the vicinity of the maximum output operating point.

JP-A-57-206929 Japanese Patent Laid-Open No. 2005-235082

  By switching the control mode in this way, the power loss is reduced. However, until the vicinity of the maximum output operating point is detected, the operation is performed including the power loss. In particular, in solar cells using PN junctions such as silicon semiconductors, which are mainly used at present, it is possible to reduce power loss around noon during fine weather when maximum output can be expected. If it is a belt, it will operate with power loss as well as changes in solar radiation intensity. Therefore, a dye-sensitized solar cell has attracted attention as a technology that can replace such a solar cell. The dye-sensitized solar cell is formed by adsorbing a photosensitizing dye to a semiconductor layer, and operates by a mechanism different from the above-described solar cell using a PN junction.

  A dye-sensitized solar cell includes a light electrode having a light-transmitting substrate, a light-transmitting conductive layer laminated on the substrate, and a dye that emits electrons upon receiving light, and the light electrode. It is composed of a counter electrode facing each other at a predetermined interval and having conductivity, and a charge transfer layer sandwiched between the photoelectrode and the counter electrode. In general, a ruthenium complex is used as the dye, and a conductor containing an electrolyte such as iodine is used as the charge transfer layer. In dye-sensitized solar cells, the dye emits electrons when it is excited by absorbing sunlight, the holes remaining in the ruthenium complex dye oxidize iodine in the charge transfer layer, and is oxidized Electric power is obtained by utilizing the phenomenon that iodine is reduced by receiving electrons from the counter electrode. When a single cell is irradiated with light, voltage and current are generated by the series of phenomena described above.

  This dye-sensitized solar cell has a feature that the incident angle dependency of solar radiation is low and power is generated even when the solar radiation is scattered light. Because of these characteristics, solar energy can be efficiently converted into electrical energy even in the morning and evening hours when the solar radiation intensity is weak, the position of the sun is low, and there are many scattered light components. It is. In addition, even when compared with a silicon semiconductor solar cell having the same rated output, there is a report that the output obtained is high, and Patent Document 1 that can reduce the power loss only near noon in fine weather or In the control method described in Patent Document 2, the characteristics of the dye-sensitized solar cell cannot be fully utilized.

  The present invention has been made in view of the above problems, and an object thereof is to provide a photovoltaic power generation apparatus using a dye-sensitized solar cell capable of efficiently obtaining an output from the dye-sensitized solar cell. There is to do.

  In order to achieve the above object, the characteristic configuration of the solar power generation apparatus using the dye-sensitized solar cell according to the present invention is determined based on the solar radiation intensity and the temperature of the dye-sensitized solar cell. An operating point voltage storing unit in which operating point voltages for controlling the operating point of the battery are classified and stored in advance according to the month, a calendar information acquiring unit for acquiring calendar information including the current month and time, and the calendar information A control instruction value setting unit that extracts an operating point voltage corresponding to the operating point voltage storage unit and sets the control instruction value to control the operating point of the dye-sensitized solar cell, and the set control instruction value And a control unit that controls an operating point of the dye-sensitized solar cell.

  According to such a characteristic configuration, as a control instruction value for the control unit to control the operating point of the dye-sensitized solar cell, the operating point voltage determined in advance based on the solar radiation intensity and the temperature of the dye-sensitized solar cell. In particular, the control is performed using the operating point voltage corresponding to the calendar information at that time as the control instruction value. For this reason, operation | movement with few electric power losses can be performed according to the solar radiation intensity which changes throughout the day, or the solar radiation intensity which changes throughout a year. Therefore, it is possible to realize a solar power generation apparatus using a dye-sensitized solar cell that can efficiently obtain an output from the dye-sensitized solar cell.

  Further, it is preferable that the operating point voltage is updated to a predicted value calculated in accordance with an accumulated operating time of the dye-sensitized solar cell.

  With this configuration, even when the output characteristics of the dye-sensitized solar cell change over time due to continuous operation of the solar power generation device, the predicted value at which the operating point voltage is calculated according to the accumulated operating time Updated to For this reason, it becomes possible to set and control the operating point voltage corresponding to the output characteristics of the dye-sensitized solar cell at that time as the control instruction value. Therefore, solar energy can be effectively converted into electric energy.

  Further, it is preferable that the operating point voltage is updated according to an integrated value of output power of the dye-sensitized solar cell at a preset time.

  With such a configuration, when the integrated value of the output power of the dye-sensitized solar cell at the preset time is lower than the integrated value of the output power at the previous time, for example, the power loss is reduced. By updating to an operating point voltage that can be reduced, and setting and controlling the operating point voltage as a control instruction value, it is possible to realize a solar power generation device with low power loss over a long period of time.

  Moreover, it is preferable that the operating point voltages stored in the operating point voltage storage unit are further classified by region.

  With such a configuration, it is possible to set and control the operating point voltage suitable for the solar radiation intensity in the region as the control instruction value, so that it is possible to operate the dye-sensitized solar cell more efficiently.

1. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing a schematic configuration of a solar power generation apparatus 1 using a dye-sensitized solar cell 10 according to the present embodiment. In the present solar power generation device 1, the operating point voltage for controlling the operating point of the dye-sensitized solar cell 10 determined based on the solar radiation intensity and the temperature of the dye-sensitized solar cell 10 is classified in advance by month and time. It has a function to set and control as a control instruction value from among the set ones.

  The solar power generation device 1 includes functional units such as a dye-sensitized solar cell 10, a calendar information acquisition unit 11, a control unit 12, a control instruction value setting unit 13, an operating point voltage storage unit 14, and a power conversion unit 15. Hereinafter, the configuration of each part of the solar power generation device 1 will be described.

  The cell voltage of the cell used for the dye-sensitized solar cell 10 is about 1V. Therefore, the dye-sensitized solar cell 10 has a voltage value necessary for operating the load 100 connected to the solar power generation device 1 and ensures supply capability according to the current consumption consumed by the load 100. In addition, a plurality of cells are connected in series and parallel. Although the details will be described later, the dye-sensitized solar cell 10 operates by controlling the operating point voltage for controlling the operating point by the control unit 12 as a control instruction value.

  The calendar information acquisition unit 11 acquires calendar information including the current month and time. The time point is a time point when the present solar power generation device 1 is operated, and the month time indicates the month and time. Therefore, the calendar information including the month and time at that time is information including the month and time when the solar power generation device 1 is operated. The calendar information acquisition unit 11 that acquires such calendar information may be, for example, a built-in clock included in the solar power generation device 1.

  The operating point voltage storage unit 14 classifies operating point voltages for controlling the operating point of the dye-sensitized solar cell 10 determined based on the solar radiation intensity and the temperature of the dye-sensitized solar cell 10 according to the month and time in advance. Stored. The operating point voltages stored in the operating point voltage storage unit 14 are classified and stored by month and time as shown in FIG. When the operating point of the dye-sensitized solar cell 10 used in the present solar power generation device 1 is controlled with this operating point voltage, it is possible to obtain maximum power. In determining the operating point voltage, it is preferable to use, for example, AMeDAS solar radiation data reported by the Japan Meteorological Agency or the like. For example, when the solar radiation intensity at 9:30 am on May 22 is 830 W / m 2 and the temperature of the dye-sensitized solar cell 10 is 52 ° C., the solar radiation intensity is 830 W / m 2 and the temperature of the dye-sensitized solar cell 10 An operating point voltage capable of obtaining maximum power is obtained from the voltage-current characteristics at 52 ° C., and this operating point voltage is determined as an operating point voltage at May / 9: 00 am.

  In FIG. 2, an example in which the time interval related to the classification according to the month is set to 1 hour is illustrated, but the present invention is not limited to this. For example, it is possible to classify every 5 minutes or naturally every 30 minutes. Further, it is preferable to use data at an observation point closest to the place where the present solar power generation device 1 is installed as the AMeDAS solar radiation amount data used in determining the operating point voltage stored in the operating point voltage storage unit 14. is there. Furthermore, the operating point voltage is calculated by calculating the average integrated solar radiation from multiple years of AMeDAS solar radiation data including clear weather and cloudy weather, and using the solar radiation intensity obtained from the calculation results. It is also possible to determine an operating point voltage with less power loss in both cases.

  Returning to FIG. 1, the control instruction value setting unit 13 uses the calendar information acquired by the calendar information acquisition unit 11 among the operation point voltages classified by month and time stored in the operation point voltage storage unit 14. The corresponding operating point voltage is extracted and set as a control instruction value for controlling the operating point of the dye-sensitized solar cell 10. Specifically, assuming that the current month is March 15 at 8:30 am, the calendar information includes information of March / 8: 00 am, and a control instruction value setting unit is set according to the information. 13 extracts “data0308” from the operating point voltage stored in the operating point voltage storage unit 14 as shown in FIG. 2 and sets it to the control instruction value.

  The control unit 12 performs control so that the operating point voltage of the dye-sensitized solar cell 10 becomes the control instruction value set by the control instruction value setting unit 13, and maintains the state for a preset time. Control. The set time is preferably a time until the time segment in which the operating point voltage stored in the operating point voltage storage unit 14 is classified to the next time segment. Based on the calendar information acquired by the calendar information acquisition unit 11 after the set time has elapsed, the control instruction value setting unit 13 determines the next control instruction value from the operating point stored in the operating point voltage storage unit 14. When updated, the control unit 12 performs control using the operating point of the dye-sensitized solar cell 10 as a control instruction value. Thus, since the operating point of the dye-sensitized solar cell 10 is changed and set according to the time change of the day or the change of the month throughout the year, the dye-sensitized solar cell 10 can output the maximum power. Thus, it is possible to perform efficient operation with little power loss.

  Here, the output voltage and output current output from the dye-sensitized solar cell 10 are DC. On the other hand, when the load 100 is an alternating current load, it is necessary to convert the output from the dye-sensitized solar cell 10 into alternating current. This conversion is performed by the power conversion unit 15. The power conversion unit 15 includes a known inverter circuit, and performs frequency conversion by PWM control. Therefore, the output of the power conversion unit 15 is an AC output, and power supply suitable for the load 100 can be performed even if the load 100 is an AC load. On the other hand, when the load 100 is a DC load, AC conversion by the power conversion unit 15 is not necessary.

  Next, control for outputting maximum power from the photovoltaic power generation apparatus 1 according to this embodiment will be described. FIG. 3 is a flowchart showing an overall control procedure of the photovoltaic power generation apparatus 1 according to the present embodiment. The procedure described below is executed by hardware, software (program), or a combination of both constituting each functional unit of the solar power generation device 1 described above.

  First, the calendar information acquisition unit 11 acquires calendar information at that time (step # 10). This calendar information includes information indicating the current month. Then, the calendar information is transmitted to the control instruction value setting unit 13. The control instruction value setting unit 13 extracts the operating point voltage corresponding to the calendar information, that is, corresponding to the current month and time, from the operating point voltage storage unit 14, and sets it to the control instruction value (step # 11).

  When the operating point voltage corresponding to the current month is set to the control instruction value by the control instruction value setting unit 13, the control unit 12 controls the operating point of the dye-sensitized solar cell 10 with the control instruction value (step #). 12). This control is continued until the end (step # 13: No). According to such a flow, by setting and controlling the operating point voltage corresponding to the calendar information at that time as a control instruction value for controlling the operating point of the dye-sensitized solar cell 10, the photovoltaic power generation apparatus can be efficiently performed 1 can be operated.

2. Second Embodiment Hereinafter, a second embodiment according to the present invention will be described. In the second embodiment, the function of integrating the operating time of the dye-sensitized solar cell 10, the function of predicting the secular change of the output characteristics of the dye-sensitized solar cell 10 from the integrated time, and the prediction are calculated. It differs from the first embodiment in that it has a function of updating the operating point voltage stored in the operating point voltage storage unit 14 in accordance with the predicted value. About the structure of those other than these, it is the same as that of 1st embodiment. Therefore, in the following, the above-described functions will be mainly described.

  FIG. 4 is a block diagram schematically showing a schematic configuration of the solar power generation device 1 using the dye-sensitized solar cell 10 according to the second embodiment. In the present embodiment, in addition to the functional units described in the first embodiment, an operating time integrating unit 16, a predicted value calculating unit 17, and an operating point voltage updating unit 18 are provided. About the function of each function part other than these, it is the same about what has no description in particular.

  The operating time integration unit 16 performs integration of the integrated operation time that is an integrated value of the operation time of the dye-sensitized solar cell 10. This integration is performed from the time when the operating point of the dye-sensitized solar cell 10 is controlled by the control instruction value by the control unit 12.

  The predicted value calculation unit 17 calculates a predicted value when the accumulated operation time accumulated by the operation time accumulation unit 16 reaches a preset time. Here, as shown in FIG. 5, it is known that the output characteristics of the dye-sensitized solar cell 10 change with time according to the operation time. That is, it is known that the solar cell voltage generated between the output terminals of the dye-sensitized solar cell 10 decreases according to the operation time. As a result, the difference between the preset operating point voltage, that is, the operating point voltage stored in the operating point voltage storage unit 14, and the operating point voltage at which the maximum power can actually be obtained is increased, and the operating time is increased. The power loss increases as the length increases.

  In order to suppress such an increase in power loss, the predicted value calculation unit 17 responds to the accumulated operation time accumulated by the operation time accumulation unit 16 and the output aging characteristics as shown in FIG. The predicted value of the operating point voltage corresponding to the next operating time is calculated. That is, when the current accumulated operation time is 8000 hours and the accumulated operation time reaches 10,000 hours, the predicted value of the operating point voltage corresponding to the current section (T3) is calculated.

  The predicted value calculated by the predicted value calculation unit 17 is transmitted to the operating point voltage update unit 18. The operating point voltage update unit 18 updates the operating point voltage for each month stored in the operating point voltage storage unit 14 to a predicted value. Thus, even if this solar power generation device 1 is a case where the output characteristics of the dye-sensitized solar cell 10 have changed over time due to continuous operation, the predicted value in which the operating point voltage is calculated according to the accumulated operating time. Therefore, the operating point voltage corresponding to the output characteristics of the dye-sensitized solar cell 10 at that time can be operated as the control instruction value. Therefore, solar energy can be effectively converted into electric energy. The prediction of the predicted value may be performed by storing a secular change characteristic in a storage unit (not shown) in advance and calculating a predicted value of the operating point voltage corresponding to the secular change characteristic or corresponding to the integrated operation time. The predicted value of the operating point voltage may be stored in the form of a table and referred to when it needs to be updated.

  As described above, the operating point voltage stored in the operating point voltage storage unit 14 is updated according to the aging characteristics of the output characteristics of the dye-sensitized solar cell 10 when the accumulated operating time reaches a preset time. The The preset time may be a time each time the accumulated operation time reaches N times (an integer multiple) of a reference operation time (for example, 5000 hours) as shown in FIG. Different times may be set in advance for each period (T1, T2, T3, etc.) shown in FIG. For example, as shown in FIG. 5, when the output characteristics are not constant with respect to the accumulated operation time, a method of setting different times in advance for each of the latter periods is suitable. On the other hand, when it changes uniformly, the method of setting time every time it reaches N times (integer multiple) of the former standard operation time (for example, 5000 hours) is suitable.

  Next, control for outputting maximum power from the photovoltaic power generation apparatus 1 according to this embodiment will be described. FIG. 6 is a flowchart showing an overall control procedure of the photovoltaic power generation apparatus 1 according to this embodiment.

  First, the calendar information acquisition unit 11 acquires calendar information at that time (step # 20). This calendar information includes information indicating the current month. Then, the calendar information is transmitted to the control instruction value setting unit 13. The control instruction value setting unit 13 extracts the operating point voltage corresponding to the calendar information, that is, corresponding to the current month and time, from the operating point voltage storage unit 14, and sets it as the control instruction value (step # 21).

  When the operating point voltage corresponding to the current month is set to the control instruction value by the control instruction value setting unit 13, the control unit 12 controls the operating point of the dye-sensitized solar cell 10 with the control instruction value (step #). 22). Along with the start of this control, the operating time integrating unit 16 starts integrating operating time (step # 23). When control of the operating point of the dye-sensitized solar cell 10 by the control unit 12 is started and the preset time has not elapsed (step # 24: No), the control unit 12 continues to control. (Step # 27: No). On the other hand, when the preset time has elapsed (step # 24: Yes), the predicted value calculation unit 17 calculates the predicted value of the operating point voltage of the dye-sensitized solar cell 10 associated with the aging deterioration characteristic (step # 24). # 25).

  Then, the operating point voltage update unit 18 updates the operating point voltage stored in the operating point voltage storage unit 14 from the calculated predicted value (step # 26). Subsequently, when the operating point of the dye-sensitized solar cell 10 is controlled by the control instruction value by the control unit 12 (step # 27: No), the updated operating point voltage stored in the operating point voltage storage unit 14 is used. Are used based on calendar information. In step # 27, when the operating point of the dye-sensitized solar cell 10 by the control unit 12 is not controlled by the control instruction value (step # 27: No), the process is terminated. In this way, the operating point voltage that changes according to the operating time of the dye-sensitized solar cell 10 is updated to the operating point voltage suitable for the output characteristics at that time, and the operating point voltage corresponding to the calendar information is increased. By setting and controlling as an instruction value for controlling the operating point of the solar cell 10, the solar power generation device 1 can be efficiently operated.

3. Third Embodiment Hereinafter, a third embodiment according to the present invention will be described. The third embodiment includes a function of integrating the output power of the dye-sensitized solar cell 10 every preset time, a recording function of recording the integrated output power obtained by integrating the output power, and the recorded integration. It differs from the first embodiment in that it has a power comparison function that compares the output power with the accumulated output power at the next time, and a function that updates the operating point voltage based on the power comparison. About the structure of those other than these, it is the same as that of 1st embodiment. Therefore, in the following, the above-described functions will be mainly described.

  FIG. 7 is a block diagram schematically showing a schematic configuration of the solar power generation device 1 using the dye-sensitized solar cell 10 according to the third embodiment. In the present embodiment, an operating point voltage update unit 18, a power integration unit 20, a recording unit 21, and a power comparison unit 22 are provided in addition to the functional units described in the first embodiment. . About the function of each function part other than these, it is the same about what has no description in particular.

  The power integrating unit 20 integrates integrated output power that is an integrated value of output power of the dye-sensitized solar cell 10. Here, as described above, the output of the dye-sensitized solar cell 10 includes a DC voltage and a DC current. These outputs are converted by the power converter 15 into an AC output suitable for the load 100 that is an AC load. The output power integration performed by the power integration unit 20 is performed on the output power converted into the AC output.

  The above-described integrated output power is integrated every preset time and recorded in the recording unit 21. The power comparison unit 22 compares the previous accumulated output power recorded in the recording unit 21 with the current accumulated output power accumulated by the power conversion unit 15. The comparison result is transmitted to the operating point voltage update unit 18. When the current accumulated output power is smaller than the previous accumulated output power, the operating point voltage update unit 18 updates the operating point voltage for each month stored in the operating point voltage storage unit 14. This update is preferably performed by previously storing the operating point voltage for each integrated output power in the operating point voltage storage unit 14 and updating the operating point voltage to the corresponding integrated output power. In this way, the solar power generation device 1 updates the operating point voltage according to the accumulated output power of the dye-sensitized solar cell 10, so that the operating point voltage corresponding to the output power at that time is set as the control instruction value. It becomes possible to operate as. Therefore, it becomes possible to convert solar energy into electric energy effectively over a long period of time.

  Next, control for outputting maximum power from the photovoltaic power generation apparatus 1 according to this embodiment will be described. FIG. 8 is a flowchart illustrating an overall procedure of control of the solar power generation device 1 according to the present embodiment.

  First, the calendar information acquisition unit 11 acquires calendar information at that time (step # 30). This calendar information includes information indicating the current month. Then, the calendar information is transmitted to the control instruction value setting unit 13. The control instruction value setting unit 13 extracts an operating point voltage corresponding to the calendar information, that is, corresponding to the current month, from the operating point voltage storage unit 14 and sets it as a control instruction value (step # 31).

  When the operating point voltage corresponding to the current month is set to the control instruction value by the control instruction value setting unit 13, the control unit 12 controls the operating point of the dye-sensitized solar cell 10 with the control instruction value (step #). 32). Along with the start of this control, the power integrating unit 20 starts integrating the output power (step # 33). When the power conversion unit 15 performs AC conversion of the output power and the preset time has not elapsed (step # 34: No), the control unit 12 continues to control (step # 38: No). ). On the other hand, when the preset time has elapsed (step # 34: Yes), the power comparison unit 22 calculates the previous accumulated output power recorded in the recording unit 21 and the current accumulated output power. Comparison is performed (step # 35).

  If the current accumulated output power is smaller than the previous accumulated output power at a preset time by the comparison (step # 36: Yes), the operating point voltage update unit 18 causes the operating point voltage storage unit 14 to operate. Is updated (step # 37). Then, when the operating point of the dye-sensitized solar cell 10 is controlled by the control instruction value by the control unit 12 (step # 38: No), the updated operation stored in the operating point voltage storage unit 14 is continued. A point voltage is extracted and used based on calendar information.

  On the other hand, if the current accumulated output power is larger than the previous accumulated output power in step # 36 (step # 36: No), it is stored in the operating point voltage storage unit 14 by the operating point voltage update unit 18. The operating point voltage is not updated. Moreover, in step # 38, when the operating point of the dye-sensitized solar cell 10 by the control unit 12 is not controlled by the control instruction value (step # 38: No), the process is terminated. In this way, the operating point voltage that changes according to the output power of the dye-sensitized solar cell 10 is updated to an operating point voltage that is suitable for the output characteristics at that time, and the operating point voltage that corresponds to the calendar information is increased. By setting and controlling as an instruction value for controlling the operating point of the solar cell 10, the solar power generation device 1 can be efficiently operated.

4). Other Embodiments In the second embodiment, the operating point voltage is updated to a predicted value calculated according to the accumulated operating time of the dye-sensitized solar cell 10, and in the third embodiment, the operating point voltage is updated. Has been described as being updated according to the integrated value of the output power of the dye-sensitized solar cell 10 at a preset time. However, the scope of application of the present invention is not limited to this. The operating point voltage is updated according to the predicted value calculated according to the accumulated operation time of the dye-sensitized solar cell 10 and the accumulated value of the output power of the dye-sensitized solar cell 10 at a preset time. Of course, it is also possible to adopt a configuration.

  In the third embodiment, the operating point voltage has been described as being updated according to the integrated value of the AC output that has been AC-converted by the power conversion unit 15 at a preset time. However, the scope of application of the present invention is not limited to this. Of course, it is also possible to update according to the integrated value of the DC output of the dye-sensitized solar cell 10. Further, for example, when the load 100 is a DC load, it is naturally possible to dispense with the power conversion unit 15. Furthermore, even if the load 100 is a direct current load, if the output voltage of the dye-sensitized solar cell 10 and the rated voltage of the load 100 are different, the power conversion unit 15 is formed as a DC / DC converter, and the dye Of course, it is possible to increase or decrease the voltage so that the output voltage of the sensitized solar cell 10 is adapted to the rated voltage of the load 100. Even in such a case, it is naturally possible to integrate the direct current output of the dye-sensitized solar cell 10 as it is.

  In the above embodiment, the operation point voltages stored in the operation point voltage storage unit 14 have been described as being classified and stored for each month. However, the scope of application of the present invention is not limited to this. For example, the operating point voltages stored in the operating point voltage storage unit 14 can be classified by region in addition to the classification by month.

  For example, when the operating point voltages are classified by region, especially when the solar power generation device 1 is used as a residential solar power generation device, the operating point voltage corresponding to the installation location is set as the control instruction value. Is preferred. Furthermore, when the solar power generation device 1 is mounted on a moving body such as a vehicle, based on the positional information that the vehicle has, or in the case of a vehicle, the vehicle position information acquired by a GPS receiver or the like in advance. It is also preferable that the operation point voltage suitable for the position is set with reference to the control instruction value from the operation point voltages stored for each region.

The block diagram which showed typically schematic structure of the solar power generation device using the dye-sensitized solar cell which concerns on 1st embodiment. The figure which shows an example of the operating point voltage stored in an operating point voltage storage part Flow chart showing control of the photovoltaic power generation apparatus according to the first embodiment. The block diagram which showed typically schematic structure of the solar power generation device using the dye-sensitized solar cell which concerns on 2nd embodiment. Aging characteristics of output voltage Flow chart showing control of the photovoltaic power generation apparatus according to the second embodiment. The block diagram which showed typically schematic structure of the solar power generation device using the dye-sensitized solar cell which concerns on 3rd embodiment. The flowchart which shows control of the solar power generation device concerning a 3rd embodiment.

Explanation of symbols

1: Solar power generation device 10: Dye-sensitized solar cell 11: Calendar information acquisition unit 12: Control unit 13: Control instruction value setting unit 14: Operating point voltage storage unit 15: Power conversion unit 100: Load

Claims (4)

An operating point voltage storage unit that stores operating point voltages for controlling operating points of the dye-sensitized solar cells, which are determined based on solar radiation intensity and the temperature of the dye-sensitized solar cells, classified and stored in advance according to the month and time; ,
A calendar information acquisition unit that acquires calendar information including the current month and time,
A control instruction value setting unit that extracts an operating point voltage corresponding to the calendar information from the operating point voltage storage unit and sets the control instruction value to control the operating point of the dye-sensitized solar cell;
Based on the set control instruction value, a control unit for controlling the operating point of the dye-sensitized solar cell;
A solar power generation device comprising:   The photovoltaic power generation apparatus according to claim 1, wherein the operating point voltage is updated to a predicted value calculated according to an accumulated operating time of the dye-sensitized solar cell.   The photovoltaic power generation apparatus according to claim 1 or 2, wherein the operating point voltage is updated in accordance with an integrated value of output power of the dye-sensitized solar cell at a preset time.   The photovoltaic power generation device according to any one of claims 1 to 3, wherein the operating point voltages stored in the operating point voltage storage unit are further classified by region.

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