JP2014090588A - Photovoltaic power generation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photovoltaic power generation capable of controlling transmission of generated currents to a load or the like by monitoring states of power generation of a solar battery by flash light of lightning or the like having little influence on characteristics of an apparatus.SOLUTION: The photovoltaic power generation apparatus includes: a solar battery 10; a detection section that detects current waveforms of electric currents output from the solar battery 10; and a control section 23 that controls transmission of the electric current. The control section 23 controls the transmission of the electric current according to the frequency of shot pulses each having a pulse width of not more than 10 msec detected by the detection section 23, resulting from inputs of lightning, of the current waveforms.

Description

  The present invention relates to a solar power generation device.

  Conventionally, in a photovoltaic power generation system that operates a load using a solar cell as a power source, an overcurrent protection function is provided in a circuit breaker for distribution, a circuit protector, etc., and this overcurrent protection function detects a short-circuit current, The circuit was interrupted by a circuit breaker to protect the load. In addition, when the current value detection by the overcurrent protection function of the circuit breaker cannot detect the solar cell output short-circuit and the circuit is satisfactorily performed, a comparator or a logic circuit is provided outside the circuit breaker (for example, , See Patent Document 1).

JP-A-5-343722

  However, recently, it has been found that solar cells may generate electricity due to lightning. This power generation generates a larger current than that during normal power generation of the solar cell. Therefore, the generated power at this time may exceed the rated power value of the load. In such a case, the overcurrent protection function is activated, the circuit is interrupted, and the drive of the load is stopped. This is because the overcurrent protection function recognizes the current obtained by lightning as an overcurrent. As a result, there is a possibility that the power (current) generated by the solar power generation system cannot be efficiently transmitted to the load.

  One object of the present invention is to provide a solar power generation device that monitors the state of power generation of a solar cell by a flash of lightning or the like that does not easily affect the characteristics of the device, and controls power transmission to the load of the generated current. There is to do.

  A photovoltaic power generation apparatus according to an embodiment of the present invention includes a solar cell, a detection unit that detects a current waveform of a current output from the solar cell, and a control unit that controls transmission of the current. . And in this embodiment, according to the frequency | count of the shot pulse which has a pulse width of 10 msec or less detected by the said detection part due to the input of a flash among the said current waveform, the transmission of the said electric current in the said control part. To control.

  According to the photovoltaic power generation apparatus according to an embodiment of the present invention, even if a temporary overcurrent detected as a shot pulse in the current waveform of the solar cell is generated by a flash of lightning or the like, for example, current is transmitted. When the influence on the load of a device or the like is small, it is possible to perform control to maintain power transmission without stopping power transmission. Thereby, the electric power (current) generated by the solar power generation device can be efficiently transmitted to the load.

It is a block block diagram explaining an example of embodiment of the solar power generation device which concerns on this invention. It is a graph which shows an example of the waveform of the electric power generation current of the solar power generation device concerning one embodiment of the present invention. It is a control flowchart explaining 1st Embodiment which concerns on this invention. It is a control flowchart explaining 2nd Embodiment which concerns on this invention. It is a control flowchart explaining 4th Embodiment concerning this invention. It is a block diagram of the lightning countermeasure system explaining 5th Embodiment which concerns on this invention.

  Hereinafter, each example of the embodiment of the solar power generation device according to the present invention will be described with reference to the drawings.

<Embodiment 1>
As shown in FIG. 1, the solar power generation device X1 includes a solar cell 10, a power conditioner 20, an output unit 30, an AC load 40, and the like. Moreover, the commercial power grid | system 50 is connected to the solar power generation device X1.

  The solar cell 10 functions as a DC power generation unit of the solar power generation device X1. The solar cell 10 is composed of, for example, a solar cell array in which a plurality of solar cell modules are connected in series and / or in parallel. The solar cell module is configured by connecting, for example, solar cells made of polycrystalline silicon or single crystal silicon in series. The solar cell module may use a compound semiconductor such as CIS, CIGS, CZTS, or CdTe.

  The power conditioner 20 mainly functions as a power converter that converts DC power generated by the solar cell 10 into AC power. The power conditioner 20 includes a DC / DC conversion unit 21, a switching 22, a control unit 23, a storage unit 24, and the like.

  The DC / DC converter 21 has a function of boosting the direct current generated by the solar cell 10. For example, the DC / DC converter 21 adjusts the voltage generated by the solar cell 10 so as to be about 200 to 300V. The DC / DC conversion unit 21 includes, for example, a switching element, a capacitor, a reactor, a diode (not shown), and the like.

  A current sensor 21 a serving as a detection unit that detects a current generated by the solar cell 10 is provided inside or on the input side of the DC / DC conversion unit 21. The current sensor 21 a detects the waveform (current waveform) of the current generated by the solar cell 10. As such a current sensor 21a, for example, a wire clamp type sensor composed of a magnetic sensor such as a Hall element and an iron core may be used. The DC / DC conversion unit 21 is provided with an MPPT control unit 21b. The MPPT control unit 21b has a function of controlling the operating voltage of the solar cell 10 so that the solar cell 10 can generate power at the maximum power point. The MPPT control unit 21b performs control for adjusting the maximum power point based on the current information and voltage value detected by the current sensor 21a. Such current information and voltage value may be displayed on a display device, for example. Note that the DC / DC converter 21 may control the switching element by a PWM method that controls the duty of the pulse according to the converted voltage in order to adjust the output voltage in response to a change in the input voltage. Then, the power controlled to be the maximum power point is transmitted to the switching unit 22.

  The switching unit 22 converts the input DC power into AC power. The switching unit 22 includes a switch circuit unit that switches DC power to AC power by a bridge circuit using transistors, FETs, or triacs, a frequency control unit that controls switching frequency and duty in the switch circuit unit, and switching Is constituted by a filter circuit unit or the like that dulls the power waveform converted into an alternating current waveform into a curve close to the AC waveform of the commercial power system.

  On the other hand, the current information detected by the current sensor 21 a is also sent to the control unit 23. The control unit 23 has a function of monitoring the operation state of the DC / DC conversion unit 21 and the switching unit 22, determining an abnormality (such as a power failure) of the commercial power system 50 and an abnormality of the power conditioner 20, and instructing a protective operation. Have. The storage unit 24 stores information for determining that the device is abnormal as data. As a result, the control unit 23 compares the data stored in the storage unit 24 by an integrated circuit such as a CPU provided therein with the information on the voltage, current, power, and frequency obtained from the outside, and When it is determined that the power conditioner 20, the AC load 40, or the commercial power system 50 is adversely affected, a part or all of the power conditioner 20 is stopped. Moreover, the control part 24 can also issue the command which outputs an alarm etc. from the output part 30, when the above abnormalities generate | occur | produce.

  The output unit 30 can easily confirm the abnormality of the solar power generation device X1 by indicating the occurrence of the abnormality as described above with a display unit or the like. The output unit 30 may be, for example, a display unit provided in a part of the power conditioner 20. The output unit 30 may be an external monitor or the like.

  Next, an example of abnormality determination will be described. For example, when a large current exceeding the rated input current flows through the power conditioner 20 due to incorrect wiring of the solar battery 10, first, current information is detected by the current sensor 21a. Next, the current information detected by the control unit 23 is compared with the maximum allowable current value stored in the storage unit 24 in advance. Next, when it is determined that the detected current exceeds the allowable value, the DC / DC conversion unit 21 or the switching unit 22 is stopped. Thereby, since the power transmission to the power conditioner 20 is controlled (stopped), damage to the power conditioner 20 and the like are reduced. The function as described above is called an overcurrent protection function.

  The AC load 40 is a device that is driven by the electric power converted into AC by the power conditioner 20. Examples of such devices include home appliances such as a refrigerator. In addition, surplus power that is not used by the AC load 40 among the power converted into AC by the power conditioner 20 is transmitted to the commercial power system 50 for reverse power flow (power sale). The solar power generation device X1 is connected to the commercial power system 50 and supplies power to the AC load 40 from both sides while the AC load 40 such as home appliances is connected to the output side of the power conditioner 20. It is an interconnected type.

  By the way, when the current sensor 21a detects the flow of a large current from the solar cell 10 as in the above-described example, the burden on the power conditioner 20 given by the overcurrent is increased as the reaction time of the overcurrent protection function is earlier. Recently, it has been found that the generated current of the solar cell 10 may momentarily exceed the maximum allowable current due to the flash of lightning or the like rather than the erroneous wiring of the solar cell 10 as described above. . Therefore, if lightning occurs, the overcurrent protection function may be activated. As a result, there has been a phenomenon in which the power conditioner 20 stops each time lightning is emitted. Here, in order to drive the power conditioner 20 again, work such as manual return or restart is required. Therefore, since the power conversion operation is not performed until the power conditioner 20 is driven again, the generated power cannot be used during that time.

Further, it is difficult to distinguish a large current generated by lightning from a large current generated by incorrect wiring of the solar cell 10. As a method of this distinction, for example, the current state determined to be an overcurrent has continued for a certain period of time (for example, 300 msec), or the current measurement is performed again after a certain period of time (for example, 10 sec) after the power conditioner is once stopped. If there is no problem in the current value, a method of automatically restarting is used. However, in the former case, since an overcurrent flows even within a certain time, the semiconductor element inside the power conditioner 20 may be damaged. In the latter case, the amount of generated power is reduced as much as the power conditioner is stopped. Further, the power conditioner 20 operates the circuit breaker 25 at the time of starting and stopping, but since this operation makes a contact operation sound, noise increases.

  Therefore, in the present embodiment, the current waveform of the solar cell 10 generated by a flash of lightning or the like is detected, and the transmission of the current generated by the solar cell 10 is controlled based on the obtained current waveform, thereby efficiently. The power conditioner 20 is driven. Below, control of the power conditioner 20 in this embodiment is demonstrated.

  First, information on the current generated by the solar cell 10 using the current sensor 21a is detected as a current waveform. Thereby, the state of increase in current is monitored. At this time, if a shot pulse having a pulse width of 10 msec or less is detected, it is determined that power is generated by a flash of lightning or the like. The shot pulse is indicated in the current waveform by a sudden current increase generated with respect to the steady-state generated current. At this time, if the number of shot pulses detected within a predetermined time is equal to or less than the predetermined number, the overcurrent protection function is not activated. That is, the control unit 23 maintains power transmission and does not stop the power conditioner 20. On the other hand, when the number of shot pulses detected within a predetermined time is greater than the predetermined number, the overcurrent protection function is activated to stop the power conditioner 20. Note that the output signal 30 may be integrated with the control unit 23 so that the control signal for stopping the power conditioner 20 or not operating the overcurrent protection function is processed inside the control unit 23. good.

  Further, an upper limit value such as a maximum allowable current may be set for the shot pulse, and a criterion for determining whether or not the current value of the shot pulse exceeds the upper limit value may be provided. Further, since the generated current of the solar cell is proportional to the light intensity, the lightning intensity may be determined from the absolute value of the current value. Next, a current waveform obtained by power generation by the solar cell 10 when lightning occurs will be described with reference to FIG.

FIG. 2 is a graph showing changes in the generated current of the solar cell 10 connected to the power conditioner 20 in FIG. This graph displays current information detected by the current sensor 21a as a current waveform. In the solar cell 10, the current waveform increases and decreases in a wave shape by the MPPT control of the power conditioner 20, but when the MPPT control is not performed, a substantially linear waveform is obtained. In FIG. 2, the current value I _mid is the rated output current of the solar cell 10, and is the current value that is generated under normal solar radiation conditions and input to the power conditioner 20. The current value I _max is the maximum input current of the power conditioner 20, the output current of the solar cell 10 in a range not exceeding this current value is determined.

In FIG. 2, a shot pulse B is a waveform that is detected to exceed the current value I _mid and the current value I _B and has a pulse width of 10 msec or less. Further, in FIG. 2, a shot pulse C is a waveform detected exceeding the current value I _max and having a pulse width of 10 msec or less. In the following description, the current value of the shot pulse refers to the maximum value of the current value of the shot pulse. Thus, in the power generation by lightning, there is a case where a small overcurrent is detected than the current value I _max on the intensity of light of lightning. Such an overcurrent indicated by the shot pulse B is unlikely to affect the characteristics of the power conditioner 20 unless it is detected for a long time. Therefore, in the present embodiment, even if a predetermined number of shot pulses B or less are detected within a predetermined time, the power conditioner 20 is not stopped by maintaining the power transmission to the power conditioner 20. Yes. That is, in such a case, it is determined that the control unit 23 does not activate the overcurrent protection function.

Next, in FIG. 2, the control flow will be described with reference to FIG. 3 in the case of detecting the shot pulse C having a larger current value than the current value I _max.

First, the current information measured by the current sensor 21a is sent to the control unit 23 (STEP 1). Next, a current waveform is calculated from the current value and time (STEP 2). Next, it is determined whether or not the current value detected in STEP 2 by the control unit 23 is larger than the maximum input current of the power conditioner 20 (current value I _max in this embodiment) (STEP 3). If the current value is within the normal power generation range, the process proceeds to STEP7. If it is confirmed in STEP 7 that a shot pulse has been generated a predetermined number of times or more, some abnormality may have occurred. Therefore, warning information such as an error code may be displayed on a display device or the like (STEP 10). This STEP 10 makes it possible to quickly cope with the problem. If the shot pulse is equal to or less than the predetermined number, the process returns to STEP1.

On the other hand, whether or not greater than the detected current value is current value I _max at STEP3, measuring the time from the rise of the detected shot pulse C to the fall, a pulse width tc of the shot pulse C is 10msec or less (STEP 5). In STEP5, if the pulse width tc of the shot pulse C is 10 msec or less, it is determined that the power generation is caused by lightning, and the process proceeds to STEP6. Then, the control unit 23 sends a signal to the control circuit so that the overcurrent protection function of the power conditioner 20 does not operate (STEP 6). Next, in STEP 7, if it is confirmed in STEP 7 that a shot pulse has been generated a predetermined number of times or more, control is performed to display the occurrence of an abnormality as described above via STEP 10. Further, the display output in STEP 10 may be confirmed, and if necessary, a countermeasure may be taken to manually stop the power conditioner 20 (not shown).

Further, in STEP5, when the pulse width of the shot pulse C is larger than 10 msec, it proceeds to STEP12 as an abnormality of the input current, activates the overcurrent protection function, and stops the power conditioner. At this time, a conditional branch like STEP 11 may be provided before STEP 12 to limit the operation of the overcurrent protection function. In case in the figure, after STEP5, in STEP 11, the current value is an upper limit (e.g., the current value _{I max)} after confirming that the state of more than continued over 300 msec, and the process proceeds to STEP 12. As described above, even if the pulse width of the shot pulse C exceeds 10 msec, control may be performed so that the overcurrent protection function is not activated until a predetermined time if the influence on the power conditioner 20 is small.

  In the above-described example, power transmission to the power conditioner 20 is controlled (stopped) by stopping the DC / DC conversion unit 21 or the switching unit 22, but the present invention is not limited to this method. For example, the operation of the power conditioner 20 may be completely stopped by performing a control to turn off the main power supply of the power conditioner 20. With this method, it becomes easier to disconnect the power conditioner 20 from the grid connection relay. In this case, even if a power failure occurs, voltage is less likely to be generated on the system side due to reverse power flow (power sale) from the power conditioner, so safety is improved.

<Embodiment 2>
In the present embodiment, the detection step of the waveform described in embodiment 1, the peak current value of the waveform even less current value I _max, the pulse width tc is to extract the following shot pulse 10 msec. Thereby, since the occurrence of lightning can be provided as information regardless of the intensity of lightning, it is possible to perform a protective operation for reducing damage to the power conditioner 20 due to lightning surge. By detecting the current value I _max current value is smaller shot pulse B than for the embodiment for performing a predetermined control, it will be described with reference to FIG.

First, in the present embodiment, as described above, the current value of the shot pulse B is smaller than the current value I _max, the following always upper limit current value in STEP3. Therefore, the present embodiment is different from the steps of the first embodiment in that the process automatically proceeds to STEP4. Next, it is determined whether or not the current value of the shot pulse B is equal to or greater than a predetermined value (STEP 4). If the current value of the shot pulse B is smaller than the predetermined value, the process proceeds to STEP7. On the other hand, if the current value of the shot pulse B is equal to or greater than a predetermined value, it is determined whether or not the pulse width of the shot pulse B is 10 msec or less (STEP 5). In addition, what is necessary is just to use the electric current value estimated that the solar cell 10 generated with lightning light, for example with the above-mentioned predetermined value. In the present embodiment, for example, to set the current value I _B as the absolute value of the current as the predetermined value, the current value may be determined by whether more than I _B. In the present embodiment, the predetermined value is equal to or higher than the rated output current of the solar cell 10, but is not limited to this.

  Next, it is determined whether or not the shot pulse B having a pulse width of 10 msec or less is equal to or less than a predetermined number (STEP 7). Here, when the shot pulse B is generated more than a predetermined number, it indicates that the lightning strike frequency is high even if the lightning intensity is small. For this reason, there is a possibility that the power conditioner 20 may malfunction or malfunction due to lightning surges caused by lightning strikes, power outages or instantaneous voltage drops. Therefore, when the shot pulse B is generated more than a predetermined number of times, control is performed to stop the power conditioner 20 (STEP 13).

  On the other hand, if the number of shot pulses B is equal to or less than the predetermined number in STEP7, it may be returned to STEP1 as having no abnormality. At this time, the process may proceed to a step of analyzing the magnitude of the current value of the current waveform in time series (STEP 8) and a step of grasping the tendency of increase / decrease of the current to predict future control (STEP 9). As a result, if the information obtained in STEP 8 and STEP 9 is calculated as necessary and is output simultaneously with the warning information in STEP 10, it can be used as a determination material when the user determines that the inverter 20 is stopped. . On the other hand, based on the information obtained in STEP8 and STEP9, the process proceeds to STEP13 and the power conditioner 20 may be stopped by automatic control.

  In the present embodiment, by monitoring the occurrence of shot pulses of a current waveform, it is possible to predict the future occurrence of lightning, so that it is possible to cope with lightning surges, power outages, or instantaneous voltage drops.

<Embodiment 3>
In the present embodiment, a control method in a state where shot pulses are difficult to detect will be described. Specifically, in this embodiment, as shown in FIG. 2, a method for detecting the shot pulse E of a current value lower than the current value I _B as lightning. Since the current waveform such as the shot pulse E has a small change in increase / decrease of the current value, it is difficult to distinguish whether it is noise in the current waveform or an instantaneous increase in power generation due to lightning. Therefore, in this embodiment, thereby improving the detection sensitivity of the lightning by detecting a change width Δi of current in addition to the predetermined value I _B of the current.

Specifically, in the present embodiment, the change in the generated current during a predetermined time is monitored, and the amount of change in the current is calculated when an instantaneous increase in current value (10 msec or less) occurs. If a change width Δi greater than a predetermined value is generated in the current value from the amount of change, it is determined that the shot pulse is caused by lightning. In this way, as shown by the broken line in the current waveform in the figure, when the ambient solar radiation intensity decreases and the generated current decreases, and it becomes an environment where lightning light is easy to detect, A shot pulse of the generated current due to lightning that was difficult to identify can be captured. This makes it available as information also lightning occur for lightning only predetermined value I _B following power generation current of the current can not be output.

The specific value of the change width Δi greater than a predetermined value of the current value is not particularly limited as long as it is a positive number. For example, if the generated current is 10 [A], the current value instantaneously increases to 12 [A] or more. In such a case, it may be determined that the power generation is based on lightning. In addition, since the change width with respect to the generated current value is Δi, lightning light that is darker as the solar radiation intensity decreases can be detected. Thereby, even if the surroundings are darkened by thunderclouds, the accuracy of lightning light detection is improved, and it is easy to avoid the effects of lightning. For example, when I _mid of the current waveform of the solar cell 10 in FIG. 2 is 10 [A], the solar radiation intensity decreases, and the generated current waveform of the solar cell becomes 6 [A] as shown by the broken line in the drawing. Assuming that the change width Δi of the shot pulse E increases by 4 [A], it can be recognized as a shot pulse of 6 [A]. Further, in the present embodiment, nighttime lightning light detection is also possible, so that the solar cell 10 can be used as a lightning light sensor as a lightning light information providing device for avoiding failure of home appliances and the like.

<Embodiment 4>
In the present embodiment, a method for controlling power transmission according to the number of shot pulses having a pulse width of 10 msec or less will be described with reference to FIG. The present embodiment is the same as the first and second embodiments up to the step 5 in which it is determined whether or not the shot pulse has a pulse width of 10 msec or less.

  In this embodiment, the overcurrent protection function is activated when a shot pulse having a pulse width of 10 msec or less is detected a predetermined number of times or more. For example, in the present embodiment, when a current waveform having a period in which 10 shot pulses are detected within a certain time (for example, 500 msec) is obtained in STEP 14, a pulsed overcurrent is input. In step 12, the overcurrent protection function may be activated, and the power conditioner 20 may be stopped. Also, in STEP 14, if a shot pulse is not detected for a predetermined time after several shot pulses are detected, it is determined that lightning is not continuously generated and the process proceeds to STEP 15. For example, it is possible to reduce erroneous determinations that cause the power conditioner 20 to be stopped by shot pulses that are generated so as to substantially overlap each other when a plurality of lightning lights are generated almost simultaneously.

  In this embodiment, it is possible to reduce malfunctions as much as possible by determining whether or not shot pulses are periodically generated at a frequency of a predetermined time or more in STEP14.

  In addition to the upper limit value detected up to STEP14 and a shot pulse greater than or equal to a predetermined value, in STEP16, a current waveform having a current change width Δi greater than or equal to a predetermined value is detected, and then in STEP17, the magnitude of the current value of the current waveform is determined. If analyzed in time series, in STEP18, the degree of influence of lightning surge can be estimated from the number of occurrences and the magnitude of the current waveform. Specifically, when the current value of the shot pulse tends to increase, or when the interval of the generation time of the shot pulse is reduced, it is estimated that the degree of influence is increased. Moreover, you may alert a user by displaying the information obtained by STEP18 on the output part 30. FIG. Further, a control signal may be transmitted based on the information obtained in STEP 18 to stop the power conditioner 20 and avoid danger.

<Embodiment 5>
This embodiment is different from the above-described embodiment in that lightning light information detected from a current waveform obtained by power generation of the solar cell 10 is also used for protection of devices other than the power conditioner.

  As shown in FIG. 6, the solar power generation device X2 includes a solar cell 10 (not shown), a power conditioner 20, an output unit 30, an AC load 40, a commercial power system 50 (not shown), an EMS device 60, and a network router. 70.

  When the solar power generation device X2 determines that the power is generated by lightning light from the shot pulse detected by the current sensor 21a (not shown), the lightning light detection information is sent to the external display device 31 through the output unit 30 for display. Can do. Thereby, it is possible to alert the user of the occurrence of lightning. In addition, the user can stop other devices (AC loads) depending on the situation. For example, the user can easily protect devices other than the power conditioner such as a television, a video, and a microwave oven from a lightning surge. Further, if the output unit 30 is connected to the network router 70, a stop signal may be sent to the AC load 40 connected to the LAN to stop the device.

  In the present embodiment, a signal from the output unit 30 is also sent to an EMS (energy management system) device 60. The EMS device 60 is provided with a control device that performs drive control of the home appliance that is the AC load 40. Therefore, by sending information on the detection of lightning light to the EMS device 60, the EMS device 60 can stop the AC load 40 and protect it from lightning surge. As a method of controlling the AC load 40 by the EMS device 60, for example, a wired system such as a power transmission line or a LAN cable, or a wireless system that transmits a signal to a receiving unit (not shown) of the AC load 40b using the transmitter 61. It may be. Thereby, a plurality of AC loads 40 can be controlled. In addition, if the device is capable of complicated calculations, such as the EMS device 60, detailed analysis of the lightning detection signal can be performed internally. Therefore, it is possible to perform control with higher accuracy. Therefore, by transmitting information (signal) of the current waveform from the output unit 30 to the EMS device 50, the EMS device 60 calculates the degree of lightning danger and determines whether to stop the operation of the AC load 40. You may do it.

  If the signal from the output unit 30 is connected to a network router 70 such as the Internet, it is possible to send lightning detection information to an external server 80 such as a maintenance company. The external server 80 can send information to the user's portable terminal 90 (forced control unit) or the like. Then, the user who has received the lightning information based on the detection result of the current waveform by the receiving means built in the portable terminal 90 confirms the information on the lightning based on the detection result displayed on the display means of the portable terminal 90. After that, for example, a power transmission control signal for forcibly controlling current transmission from a transmission unit built in the mobile terminal 90 may be sent directly to the EMS device 60 or the AC load 40. Thereby, the user can operate the stop of the device. In addition, if the information on the lightning detection provided to the external server 80 can be disclosed and the user in the neighboring area can browse the information, the AC load that is not connected to the photovoltaic power generation device X2 can be reduced. Can protect against lightning surge.

X1, X2: Solar power generation device 10: Solar cell 20: Power conditioner 21: DC / DC conversion unit 21a: Current sensor (detection unit)
21b: MPPT control unit 22: switching unit 23: control unit 24: storage unit 25: circuit breaker 30: output unit 31: display device 40: AC load 50: commercial power system 60: EMS device 61: transmitter 70: network router 80: External server 90: Mobile terminal

Claims (4)

Solar cells,
A detection unit for detecting a current waveform of the current output from the solar cell;
A photovoltaic power generation apparatus comprising a control unit for controlling transmission of the current,
Solar power generation in which the control unit controls the transmission of the current according to the number of shot pulses having a pulse width of 10 msec or less detected by the detection unit due to the input of flash light in the current waveform apparatus.   2. The photovoltaic power generation apparatus according to claim 1, wherein the control unit maintains power transmission when the shot pulse is detected a predetermined number of times or less during power transmission. 3.   The said control part is a solar power generation device of Claim 1 which stops the transmission of the said electric current, when the shot pulse more than predetermined times is detected during the transmission of the said electric current. An output unit for outputting the detection result of the current waveform by the detection unit;
The output unit is provided with a forcible control unit that transmits a power transmission control signal for forcibly controlling transmission of the current by the control unit,
The forcible control unit includes receiving means for receiving the detection result of the current waveform, display means for displaying the detection result, and transmitting means for transmitting a power transmission control signal for forcibly controlling current transmission. The solar power generation device according to any one of claims 1 to 3.

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