JP4911531B2 - Power converter and power generation system using the same - Google Patents

Description

  The present invention relates to a power conversion device and a power generation system using the power conversion device, and more particularly to a power conversion device including a cooling fan for cooling a power conversion unit and a power generation system using the power conversion device.

  Photovoltaic power generation, wind power generation, fuel cells, and the like operate as a DC power source and output DC power. In order to output DC power generated from such a DC power source to a general AC load or to link to an existing commercial power system, a power conversion device that converts it into AC power is required. The power conversion unit of such a power conversion device generates heat because a conversion loss occurs and needs to be cooled.

As such a power converter, there exists a thing as described in patent document 1. FIG. The power conversion device described in Patent Document 1 includes a blower (cooling fan) in a housing, and a housing is provided with an intake / exhaust port. The air sucked from the intake port cools the power converter and is exhausted from the exhaust port to the outside of the housing by the cooling fan.
Japanese Patent Laid-Open No. 11-122949

  As cooling fan drive control, control is generally performed such that the output power (power generation amount) is ON when the output power (power generation amount) is equal to or greater than a threshold value, and OFF when the output power is equal to or less than the threshold value, regardless of outdoor conditions.

  When performing such control, the threshold is set on the assumption that the cooling capacity is most needed, that is, the day when the output power is large or the temperature is high. Therefore, even under conditions that do not require large cooling capacity (such as days when output power is low or days when the temperature is low), if the output power exceeds a preset threshold, the cooling fan will have maximum cooling capacity. Will work. In such a case, there is a problem that more power than is actually required for cooling is consumed for driving the cooling fan, and as a result, the efficiency of the power converter is reduced.

  In the above-mentioned document, there is no proposal for such cooling fan drive control.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power conversion device that can reduce the power consumption of a cooling fan and improve the efficiency of power conversion. Is to provide.

  A power converter according to an aspect of the present invention is a power converter that can be connected to a DC power source, and is converted by the power converter for converting DC power from the DC power source into AC power, and the power converter. Output means for outputting the AC power to the load and / or the commercial power system, a cooling fan for cooling the power conversion means by blowing air to the power conversion means, and the amount of power generated by the power conversion means is monitored. Monitoring means, and storage means for storing in advance a plurality of power generation control data relating to the power generation amount in association with each of the plurality of specific information, each specific information having an influence on the output of the DC power source Information that can be relatively specified, a measuring means for measuring the current specific information, an acquisition means for acquiring the current specific information from the measuring means, and a current Drive control means for controlling driving of the cooling fan based on the specific information, and the drive control means includes the power generation control data associated with the current specific information and the power generation amount monitored by the monitoring means. To control the driving of the cooling fan.

  Preferably, the state of the cooling fan controlled by the drive control means is two or more including operation and stop.

Preferably, each power generation control data includes at least two threshold values.
Preferably, the apparatus further comprises detection means for detecting the temperature of the power conversion means, the storage means further stores in advance at least one temperature threshold related to the temperature of the power conversion means, and the drive control means further includes detection means. The driving of the cooling fan is controlled by comparing the temperature detected by the above and the temperature threshold value.

  Preferably, the apparatus further comprises detection means for detecting the temperature of the power conversion means, and when the state of the cooling fan is two types of operation and stop, each power generation control data includes a first output threshold, and drive control When the temperature detected by the detection means is equal to or higher than the temperature threshold when the cooling fan is stopped, and the monitored power generation amount is equal to or higher than the first output threshold, the cooling fan is Start driving.

  Preferably, each power generation control data further includes a second output threshold value that is lower than the first threshold value, and the drive control means is configured such that the monitored power generation amount is a second output when the cooling fan is in an operating state. When it becomes less than the threshold value, the cooling fan is stopped.

  Preferably, when the state of the cooling fan is three types of high-speed operation, low-speed operation, and stop, each power generation control data includes the start of low-speed operation of the cooling fan, operation stop, change from high-speed operation to low-speed operation, and low-speed operation. Includes four output thresholds for determining each change to high speed operation.

  Preferably, each specific information includes at least a month, and the measuring unit includes a timing unit that performs a timing operation.

Preferably, each specific information further includes a date and a time.
A power generation system according to another aspect of the present invention includes the power conversion device.

  According to the present invention, since the cooling fan is driven and controlled according to the outdoor situation, the power consumption of the cooling fan can be reduced. As a result, the efficiency of power conversion can be improved.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

(Appearance and configuration)
First, an example of the structure of the power conversion device 1 in the present embodiment will be described.

  FIG. 1 is a perspective view showing an appearance of a power conversion device 1 according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The power conversion device 1 according to the present embodiment includes a housing 2 having an intake port 3 and an exhaust port 4, a power conversion unit 22 provided in the housing 2, a cooling fan 9 provided in the housing 2, An exhaust cover 11 connected to the housing 2 is provided. A waterproof cover 5 is provided inside the bottom surface of the housing 2 so as to cover the air inlet 3. A heat sink 6 is provided on the back surface of the housing 2 so as to be positioned above the waterproof cover 5. The heat sink 6 is divided into a plurality of portions by a plurality of blade portions 8 extending vertically. On the front surface of the heat sink 6, a power conversion unit 22 that converts DC power output from a solar cell or the like into AC power is provided. The power element 7 that generates the most heat in the power conversion unit 14 is provided in contact with the surface of the heat sink 6.

  By driving the cooling fan 9, external cold air is taken into the housing 2 from the air inlet 3. The taken-in air is discharged through a space formed inside the waterproof cover 5. Heat generated in the power element 7 is conducted to the blade portion 8 of the heat sink 6. When cold air passes while contacting the blade portion 8 in the heat sink 6, the heat of the blade portion 8 is taken away. As a result, the power conversion unit 22 is cooled.

  The air heated by heat exchange with the blades 8 when passing through the space inside the heat sink 6 is discharged above the heat sink 6. This air is sucked into the cooling fan 16, passes through the hole 10, and is discharged from the exhaust port 4.

  Such a power conversion device 1 is connected to a DC power supply and functions as a power generation system. That is, the power conversion device 1 is connected to a DC power source and a load or / and a commercial power system, converts DC power from the DC power source into AC power in the power conversion unit 22, and loads the converted AC power into the load. Or output to the commercial power system. Moreover, the power converter device 1 may be connected to the commercial power system.

  Below, a structure and operation | movement of the power converter device 1 in case DC power supply is photovoltaic power generation are demonstrated. Note that the DC power source is not limited to solar power generation, and may be wind power generation or the like.

  FIG. 4 is a functional block diagram showing a functional configuration of the power conversion device 1 used in the power generation system according to the embodiment of the present invention.

  Referring to FIG. 4, the power generation system in the present embodiment includes a solar cell array 40 including a plurality of solar cell module strings 41 and a power conversion device 1.

  The solar cell module string 41 includes a plurality of solar cell modules (not shown) that receive sunlight and generate electric power. The solar cell module string 41 is a unit in which a plurality of solar cell modules (not shown) formed in a panel shape, for example, are connected in series or in parallel and bundled, particularly when installed on a plurality of roof surfaces.

  Moreover, the wiring for supplying electric power to the power converter device 1 for every solar cell module string 41 is provided. Thus, the output from the solar cell array 40 is input to the power conversion device 1 via the wiring.

  The power conversion device 1 includes a switch 21 for cutting off power from the solar cell module string 41, a power conversion unit 22 for converting DC power from the solar cell module string 41 into AC power, and a timing operation. The timer 23 to perform, the temperature sensor 24 for detecting the temperature of the power converter 22, the output part 25 for outputting the electric power which the power converter 22 generate | occur | produced to the load 50, and the control unit 30 are included.

  The control unit 30 includes a control unit 31 that controls the cooling fan 9, the switch 21, and the power conversion unit 22, and a nonvolatile memory 37. The memory 37 stores in advance a fan control data table 38 that stores a plurality of power generation control data relating to the power generation amount in advance in association with a plurality of pieces of specific information. The fan control data table 38 further stores in advance temperature control data related to the temperature of the power converter 22.

  Each “specific information” is information that can relatively specify an outdoor situation (for example, the amount of output power, the external temperature) that affects the output of the solar cell module string 41 that is a DC power supply. In the present embodiment, the specific information will be described as including only month data.

The data structure of the fan control data table 38 in this embodiment is shown in FIG.
Referring to FIG. 5, fan control data table 38 mainly has three items. The first item stores a plurality of month data. The second item includes the temperature threshold value Ta for determining whether the power converter 22 is abnormal and the temperature threshold value Tb for determining whether or not to operate the cooling fan 9 regardless of the month data. Temperature control data including the above data is stored. The temperature thresholds Ta and Tb are predetermined to be 90 ° C. and 50 ° C., respectively, for example.

  The third item stores power generation control data in association with each of a plurality of month data. Each power generation control data includes data of an output threshold value Pa for determining whether or not to operate the cooling fan 9 and data of an output threshold value Pb for determining whether or not to stop the cooling fan 9. The output thresholds Pa and Pb are determined in advance as 300 W and 250 W, respectively, for example, corresponding to November to March. 200 W and 200 W are determined in advance corresponding to March to May and October, respectively. 100 W and 50 W are predetermined in correspondence with June to September, respectively.

  Thus, in this embodiment, monthly data is used as the specific information, and different output thresholds Pa and Pb are set according to each month.

  Note that the timer 23 can measure the current specific information and measures at least the month, day, and hour.

  As described above, in this embodiment, each month data and power generation control data are stored in the data table in association with each other. However, the present invention is not limited to such a form, and each data is stored in the memory 37. And may be stored in association with each other.

  Further, it is preferable that the value of the power generation control data is determined in advance depending on the region (destination) where the power conversion device 1 is installed. That is, it is preferable that different output thresholds Pa and Pb are determined depending on regions even in the same January. Or you may enable it to set and change the value of electric power generation control data via an operation part (not shown).

  The control unit 31 is configured by, for example, a CPU (Central Processing Unit), and as its function, an acquisition unit 33 for acquiring a time measurement result by the timer 23 and determining the current month, and power generation of the power conversion unit 22 A monitoring unit 34 for monitoring the amount (output power to the output unit 25) and a drive control unit 35 for controlling the driving of the cooling fan 9 are included. The power conversion device 1 further includes a drive device (not shown) for driving the cooling fan 9, and the drive control unit 35 of the control unit 31 transmits a control signal to the drive device. To do.

  In addition to the cooling fan 9, the drive control unit 35 is connected to the acquisition unit 33, the monitoring unit 34, the temperature sensor 24, the memory 37, and the power conversion unit 22.

  The drive control unit 35 inputs the current month determined by the acquisition unit 33, the power generation amount monitored by the monitoring unit 34, and the temperature of the power conversion unit 22 detected by the temperature sensor 24. The drive control unit 35 reads the power generation control data associated with the current month and the temperature control data from the fan control data table 38. Then, the driving control of the cooling fan 9 is performed by comparing the read control data, the monitored power generation amount, and the detected temperature.

  Note that the operation of the functional blocks included in the control unit 31 may be realized by executing software stored in the memory 37, or at least a part thereof may be realized by hardware.

  In the present embodiment, both the temperature control data and the power generation control data are stored in the fan control data table 38, and the drive control unit 35 controls the driving of the cooling fan 9 using both control data. It was decided. However, the drive control unit 35 may perform drive control of the fan 9 based only on the power generation control data, and in that case, only the power generation control data may be stored in the fan control data table 38.

(About operation)
Next, operation | movement of the power converter device 1 in this Embodiment is demonstrated.

  FIG. 6 is a flowchart showing drive control processing of cooling fan 9 executed by control unit 31 of power conversion device 1 in the embodiment of the present invention. The process shown in the flowchart of FIG. 6 is stored in advance in the memory 37 as a program, and the function of the drive control process is realized by the controller 31 reading and executing this program. Note that the processing described below is started when the power conversion device 1 that is a power conditioner (abbreviated as “power converter” for short) is activated (ON). When the power conversion device 1 is activated, the power generation amount of the power conversion unit 22 monitored by the monitoring unit 34 and the temperature of the power conversion unit 22 detected by the temperature sensor 24 are stored in the drive control unit 35. It is assumed that it has been entered.

  Referring to FIG. 6, first, acquisition unit 33 acquires current month data measured by timer 23 (step S2). The acquired month data is output to the drive control unit 35.

  Next, the drive control part 35 acquires each control data matched with the present month data from the fan control data table 38 (step S4).

  Next, the drive control unit 35 determines whether or not the temperature of the power conversion unit 22 is equal to or higher than a temperature threshold Ta ° C. (step S6). When it is determined that the temperature of power conversion unit 22 is equal to or higher than Ta ° C. (YES in step S6), control unit 31 stops driving power conversion unit 22 (step S8). On the other hand, when it is determined that the temperature of the power conversion unit 22 is lower than Ta ° C. (NO in step S6), the drive control unit 35 confirms the current state (operation or stop) of the cooling fan 9 (step S10). .

  If the state of the cooling fan 9 is stopped, the process proceeds to step S12. When the fan state is driving, the process proceeds to step S18.

  In step S12, the drive control unit 35 determines whether or not the temperature of the power conversion unit 22 is equal to or higher than a temperature threshold value Tb ° C. When it is determined that the temperature of power conversion unit 22 is equal to or higher than Tb ° C. (YES in step S12), the process proceeds to step S16. When it is determined that the temperature of power conversion unit 22 is lower than Tb ° C. (NO in step S12), the process proceeds to step S14.

  In step S14, the drive control unit 35 determines whether or not the power generation amount of the power conversion unit 22 (that is, the output of the power conditioner) is equal to or greater than the output threshold value PaW. When it is determined that the power generation amount is equal to or greater than PaW (YES in step S14), the process proceeds to step S16. When it is determined that the power generation amount is less than PaW (NO in step S14), the process returns to step S6.

  In step S <b> 16, the drive control unit 35 starts the operation of the cooling fan 9. When this process ends, the process returns to step S6.

  In step S18, the drive control unit 35 determines whether or not the power generation amount of the power conversion unit 22 is equal to or greater than the output threshold value PbW. If it is determined that the amount of power generation is greater than or equal to PbW (YES in step S18), the process returns to step S6. When it is determined that the power generation amount is less than PbW (NO in step S18), the process proceeds to step S20.

  In step S <b> 20, the drive control unit 35 determines whether or not a predetermined time (for example, 10 minutes) has elapsed since the start of the operation of the cooling fan 9. If the predetermined time has not elapsed (NO in step S20), the process returns to step S6.

  On the other hand, when it is determined that the predetermined time has elapsed (YES in step S20), drive control unit 35 stops the operation of cooling fan 9 (step S22). When this process ends, the process returns to step S6.

  Thus, according to the present embodiment, the output thresholds Pa and Pb corresponding to the current month are used as the control values of the cooling fan 9. That is, in the month where the outdoor temperature is low, output thresholds Pa and Pb higher than the month where the temperature is high are set. Therefore, only the power actually required for cooling the power conversion unit 22 is consumed for driving the cooling fan 9, and the power consumption of the cooling fan 9 can be reduced throughout the year. As a result, the efficiency of power conversion can be improved.

  Further, according to the present embodiment, since the actual temperature of the power conversion unit 22 is also used for driving control of the cooling fan 9, more effective driving control is possible.

  In the present embodiment, the power generation control data includes two output thresholds Pa and Pb, and the control value of the cooling fan 9 has hysteresis. For this reason, stable fan control is performed instead of a rapid response according to the generated power.

Specifically, this will be described with reference to FIG.
FIG. 7A is a diagram showing the state of fan control when the control value has hysteresis, and FIG. 7B shows the state of fan control when the control value does not have hysteresis. FIG.

  When photovoltaic power generation is used as a direct current power supply as in the power generation system in the present embodiment, the photovoltaic power generation is affected by the weather, so the input power to the power conversion unit 22 becomes unstable. Moreover, also when wind power generation etc. from which a wind speed changes are used as a DC power supply, the input power to the power conversion unit 22 becomes unstable. When the power converter 1 does not have special equipment such as a storage battery, the generated power also becomes unstable depending on the input power. In that case, if the output threshold value of the fan control data table 38 is one, the generated electric power may continue to fluctuate near the output threshold value.

  With reference to FIG. 7A, even if the output power falls below the output threshold Pa, the cooling fan 9 is turned off only after it falls below the output threshold Pb without turning off the cooling fan 9 immediately.

  On the other hand, referring to FIG. 7B, when only the output threshold Pa is provided in the fan control data table 38, the cooling fan 9 is repeatedly turned ON / OFF according to the fluctuation of the generated power. That is, in this case, the fan control is rapidly responded according to the generated power.

  Thus, in this embodiment, since the fan control data table 38 is provided with the two output thresholds Pa and Pb, chattering during the transition of the fan state can be prevented. This also reduces the increase or decrease in noise caused by the cooling fan 9 and can reduce harsh sounds. In addition, the load on the control unit 31 can be reduced.

(Modification 1)
In the above embodiment, there are two fan states (operating state of the cooling fan 9): operation and stop. However, it is preferable that there are three or more fan states.

  In Modification 1 of the present embodiment, a case where there are three fan states will be described. In addition, since the structure and basic operation | movement of the power converter device 1 are the same as that of the said embodiment, only a different part is demonstrated here.

  In the first modification, a fan control data table 38A is stored in the memory 37 instead of the fan control data table 38 of FIG.

  FIG. 8 is a diagram showing a data structure of the fan control data table 38A in the first modification of the embodiment of the present invention.

  Referring to FIG. 8, in addition to the configuration of fan control data table 38 described above, fan threshold data Tc and output threshold values Pc and Pd are stored in fan control data table 38A. That is, the temperature control data includes temperature threshold values Ta, Tb, and Tc, and the power generation control data includes output threshold values Pa, Pb, Pc, and Pd.

  The temperature threshold Tc is a predetermined value for determining whether to switch from low speed operation to high speed operation. The output threshold value Pc is a predetermined value for determining whether to switch from low speed operation to high speed operation. The output threshold value Pd is a predetermined value for determining whether to switch from high speed operation to low speed operation.

  FIG. 9 is a flowchart showing drive control processing of cooling fan 9 executed by control unit 31 of power conversion device 1 in Modification 1 of the embodiment of the present invention. The process shown in the flowchart of FIG. 9 is also stored in advance in the memory 37 as a program, and the function of the drive control process is realized by the controller 31 reading and executing this program. In this flowchart, the same step numbers are assigned to the same processes as those shown in the flowchart of FIG. Therefore, description thereof will not be repeated here.

  Referring to FIG. 9, in the first modification, step S16A is executed instead of step S16 in FIG. Further, a new step S17 is inserted between step S10 and step S18, and the processes of steps S24, S26, S28, and S30 are added.

  In the first modification, in step S10, the drive control unit 35 confirms whether the current state of the cooling fan 9 is low speed operation, high speed operation, or stop.

In step S <b> 16 </ b> A, the drive control unit 35 starts the low-speed operation of the cooling fan 9.
When it is determined in step S10 that the state of the cooling fan 9 is the low speed operation, in step S17, the drive control unit 35 determines whether or not the temperature of the power conversion unit 22 is equal to or higher than the temperature threshold Tc ° C.

  When it is determined that the temperature of power conversion unit 22 is equal to or higher than Tc ° C. (YES in step S17), the process proceeds to step S26. When it is determined that the temperature of power conversion unit 22 is lower than Tc ° C. (NO in step S17), the process proceeds to step S18.

  In step S18, as described above, the drive control unit 35 determines whether or not the output of the power conversion unit 22 is greater than or equal to the output threshold value PbW. When it is determined that the output of power conversion unit 22 is less than PbW (NO in step S18), the same processing as described above is executed.

  On the other hand, when it is determined that the output of power conversion unit 22 is equal to or higher than PbW (YES in step S18), drive control unit 35 further determines whether the output of power conversion unit 22 is equal to or higher than output threshold value PcW. Is determined (step S24).

  When it is determined that the output of power conversion unit 22 is equal to or higher than PcW (YES in step S24), drive control unit 35 switches the operating speed of cooling fan 9 from the low speed to the high speed (step S26). When this process ends, the process returns to step S6.

  If it is determined in step S24 that the output of the power converter 22 is less than the output threshold value PcW (NO in step S24), the process returns to step S6.

  When it is determined in step S10 that the state of the cooling fan 9 is high-speed operation, in step S28, the drive control unit 35 determines whether the output of the power conversion unit 22 is equal to or greater than the output threshold value PdW. .

  If it is determined that the output of power conversion unit 22 is equal to or greater than PdW (YES in step S28), the process returns to step S6. When it is determined that the output of power conversion unit 22 is less than PdW (NO in step S28), drive control unit 35 switches the operating speed of cooling fan 9 from a high speed to a low speed (step S30). When the process of step S30 ends, the process returns to step S6.

  Thus, in the first modification of the present embodiment, three states are set as the states of the cooling fan 9. Therefore, the drive control of the cooling fan 9 can be performed more efficiently than when the cooling fan 9 has two states.

(Modification 2)
Note that the power generation control data is stored for each month in the fan control data tables 38 and 38A in the above-described embodiment and the modification 1 thereof. In other words, the specific information is described as the month. However, the specific information is not limited to the month as long as it is information that can relatively specify the amount of output power or the external temperature. For example, the specific information may include year, day, hour, minute, and the like. In any case, it is preferable that the specific information includes at least a month. Alternatively, a sensor for detecting the outside air temperature may be provided in the power conversion device 1, and the outside air temperature may be included in the specific information.

  In the second modification of the present embodiment, the specific information includes the month, day, and time, and the drive control of the cooling fan 9 in that case will be briefly described.

  FIG. 10 is a diagram showing a data structure of the fan control data table 38B in the second modification of the embodiment of the present invention.

  Referring to FIG. 10, in fan control data table 38B, power generation control data is stored in association with month date data. Also in Modification 2, there are three states of the cooling fan 9. For this reason, the power generation control data includes four output thresholds as in the first modification. Also, the temperature control data includes three temperature thresholds as in the first modification. Note that, as in the above embodiment, the cooling fan 9 may have two states.

  The drive control processing of the cooling fan 9 executed by the control unit 31 can be realized by the flowchart shown in FIG.

  Thus, in the second modification, the power generation control data is stored in units of month and date. By including the time in the specific information, it is possible to consider daily fluctuations in the temperature, and more efficient fan control can be realized.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view which shows the external appearance of the power converter device in embodiment of this invention. It is sectional drawing of the power converter device along the II-II line | wire in FIG. It is sectional drawing of the power converter device along the III-III line in FIG. It is a functional block diagram which shows the function structure of the power converter device used for the electric power generation system in embodiment of this invention. It is a figure which shows the data structure of the fan control data table in embodiment of this invention. It is a flowchart which shows the drive control process of the cooling fan which the control part of the power converter device in embodiment of this invention performs. (A) is a figure which shows the state of the fan control when giving a hysteresis to a control value, (B) shows the state of the fan control when not giving a hysteresis to a control value as a comparative example. FIG. It is a figure which shows the data structure of the fan control data table in the modification 1 of embodiment of this invention. It is a flowchart which shows the drive control process of the cooling fan which the control part of the power converter device in the modification 1 of embodiment of this invention performs. It is a figure which shows the data structure of the fan control data table in the modification 2 of embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Power conversion device, 2 Housing | casing, 3 Intake port, 4 Exhaust port, 9 Cooling fan, 11 Exhaust cover, 21 Switch, 22 Power conversion part, 23 Timer, 24 Temperature sensor, 25 Output part, 30 Control unit, 31 Control unit, 33 acquisition unit, 34 monitoring unit, 35 drive control unit, 37 memory, 38, 38A, 38B fan control data table, 40 solar cell array, 41 solar cell module string, 50 load, Pa, Pb, Pc, Pd Output threshold, Ta, Tb, Tc Temperature threshold.

Claims (10)

A power converter that can be connected to a DC power source,
Power conversion means for converting DC power from the DC power source into AC power;
Output means for outputting the AC power converted by the power conversion means to a load and / or a commercial power system;
A cooling fan for cooling the power conversion means by blowing air to the power conversion means;
Monitoring means for monitoring the amount of power generated by the power conversion means;
A storage means for storing a plurality of power generation control data related to the power generation amount in advance in association with each of the plurality of specific information,
Each of the specific information is information that can relatively specify an outdoor situation that affects the output of the DC power supply,
A measuring means for measuring the current specific information;
An acquisition means for acquiring the current specific information from the measurement means;
Drive control means for controlling the drive of the cooling fan based on the current specific information;
The drive control means controls the drive of the cooling fan by comparing the power generation amount monitored by the monitoring means with the power generation control data associated with the current specific information. .   The state of the said cooling fan controlled by the said drive control means is a power converter device of Claim 1 which is 2 or more types including a driving | operation and a stop.   The power conversion device according to claim 1 or 2, wherein each of the power generation control data includes at least two threshold values. A detector for detecting a temperature of the power converter;
The storage means further stores in advance at least one temperature threshold related to the temperature of the power conversion means,
4. The power conversion according to claim 1, wherein the drive control unit further controls driving of the cooling fan by comparing the temperature detected by the detection unit with the temperature threshold value. 5. apparatus. A detector for detecting a temperature of the power converter;
When the state of the cooling fan is two types of operation and stop, each of the power generation control data includes a first output threshold value,
The drive control means is configured such that when the temperature detected by the detection means is equal to or higher than the temperature threshold when the cooling fan is stopped, and the monitored power generation amount is equal to or higher than the first output threshold. The power conversion device according to claim 4, wherein the operation of the cooling fan is started when it becomes. Each of the power generation control data further includes a second output threshold value that is lower than the first threshold value,
The said drive control means stops the driving | operation of the said cooling fan when the monitored electric power generation amount becomes less than a said 2nd output threshold value when the said cooling fan is an operation state. Power converter.   When the state of the cooling fan is three types of high speed operation, low speed operation, and stop, each of the power generation control data includes the start of low speed operation of the cooling fan, operation stop, change from high speed operation to low speed operation, and low speed operation. The power converter device in any one of Claims 2-4 containing the four output threshold values for judging each change to high speed driving | operation. Each of the specific information includes at least a month,
The power conversion device according to claim 1, wherein the measuring unit includes a time measuring unit that performs a time measuring operation.   The power conversion device according to claim 8, wherein each of the specific information further includes a date and a time.   The power generation system provided with the power converter device in any one of Claims 1-9.

Images