JP6997604B2 - Photovoltaic power generation system with a function to prevent deterioration of the solar cell module - Google Patents

Description

The present invention relates to a photovoltaic power generation system having a function of preventing deterioration of a solar cell module.

In recent years, in many photovoltaic power generation systems, the output fluctuation of the solar cell module due to the fluctuation of the weather is absorbed by the charging and discharging of the storage battery to suppress the fluctuation of the power supplied to the load, and the power is generated by the solar cell module. For the purpose of storing the surplus power and using it at night, etc., the power conditioner (the inverter that converts the DC power from the solar cell module and the storage battery into AC, and the DC power from the solar cell module is stored in the storage battery. A photovoltaic power generation system (hybrid power storage system) is known in which a storage battery is connected to or built in (including a DC / DC converter or the like that transforms DC power).

By the way, in a photovoltaic power generation system equipped with such a storage battery, it has been a problem from the past that deterioration and output reduction phenomenon (PID phenomenon, etc.) of the solar cell module occur even in a relatively small-scale photovoltaic power generation system. However, even when the solar cell module is not operating, such as at night, the voltage from the operating power conditioner (such as the DC / DC converter built into it) is applied to the solar cell module. It was newly discovered by the applicant side that it is the main cause of the output reduction phenomenon (see Patent Document 1).

As a measure to prevent such deterioration / output reduction phenomenon, the photovoltaic power generation system is provided with a function of cutting off the electrical connection between the solar cell module and the power conditioner when the solar cell module is not generating power. That is, for example, it has been proposed by the applicant to install a device for electrically connecting or disconnecting the solar cell module and the power conditioner depending on whether or not the solar cell module is generating power. I'm here.

That is, in Patent Document 1 relating to the application of the present applicant, for example, as shown in FIG. 5, "the control means detects whether or not the solar cell module is generating power" with respect to the existing solar power generation system. Or, it is determined, and when the solar cell module is not generating power, the opening / closing means is controlled to additionally provide a configuration for cutting off the electrical connection between the solar cell module and the power conditioner. By simply doing so, it is possible to prevent the voltage from the operating power conditioner from being applied to the solar cell module during times when the solar cell module is not operating, such as at night, and thus the solar cell module at night, etc. It is disclosed that the deterioration and output reduction phenomenon of the solar cell module caused by the continuous application of the voltage from the power conditioner during operation to the solar cell module can be effectively suppressed even during the time when the solar cell is not operating. Has been done.

Japanese Patent No. 6148782

As described above, the device proposed by the applicant in Patent Document 1 or the like to electrically connect or disconnect between the solar cell module and the power conditioner depending on whether or not the solar cell module is generating power. It can be said that the method of providing the above is an extremely simple and inexpensive preventive measure for the deterioration phenomenon because it is only necessary to externally attach the device between the solar cell module and the power conditioner to the conventional solar cell system. It was a thing.

However, the power conditioner provided in a general solar cell system is started by being supplied with the generated power from the solar cell module when the generated power generated by the solar cell module rises above a predetermined starting voltage in the morning, and then at night. When the power generated by the solar cell module drops below the predetermined stop voltage, the power generated by the solar cell module is not supplied and the power conditioner is stopped. And the stop voltage are different for each model of each manufacturer, so when the device for preventing the deterioration phenomenon is installed between the solar cell module and the power conditioner, it is determined for each model of the power conditioner. Since the start voltage and the stop voltage do not match well with the above-mentioned equipment, there is a possibility that the smooth operation of the power conditioner may be hindered.

The present invention has been made by paying attention to such a problem of the prior art, and in a photovoltaic power generation system including a photovoltaic power conditioner to which a storage cell is connected (or built-in), the solar cell module and the power conditioner are used. In the meantime, simply by externally attaching a device that electrically connects or cuts off the two, it is not affected by the difference in the manufacturer or model of the power conditioner built into the photovoltaic power generation system, such as at night. It is possible to easily and inexpensively prevent the deterioration / output decrease phenomenon of the solar cell module mainly caused by the voltage from the power conditioner being applied to the solar cell module even when the solar cell module is not operating. It is an object of the present invention to provide a photovoltaic power generation system having a function of preventing deterioration of a solar cell module.

The solar power generation system provided with the function of preventing deterioration of the solar cell module according to the present invention is electrically the same as the solar cell module, the storage battery for storing the power from the solar cell module or the system power source, and the solar cell module and the storage battery. In a solar power generation system provided with a connected power conditioner, an electric power generation voltage detection unit that detects the voltage of the power generated by the solar cell module and the solar cell module and the power conditioner are electrically connected or electrically connected. A connection opening / closing unit that shuts off and an opening / closing control unit that controls the connection opening / closing unit so that the voltage from the power conditioner is not applied to the solar cell module when the solar cell module is not generating electricity. Based on the output from the generated voltage detection unit, it is possible to set or adjust in advance so that the voltage of the generated power by the solar cell module corresponds to or matches the starting voltage different for each model of the power conditioner. When the supply start voltage is equal to or higher than the above, the supply of the generated power from the solar cell module to the power conditioner is started, and the voltage of the generated power by the solar cell module is different for each model of the power conditioner. When the supply stop voltage is equal to or lower than the supply stop voltage that can be set or adjusted in advance so as to correspond to or conform to the above, the open / close control unit that stops the supply of the generated power from the solar cell module to the power conditioner is provided. It is prepared.

Further, in the photovoltaic power generation system provided with the solar cell module deterioration prevention function according to the present invention, it is determined whether or not the open / close control unit starts supplying the generated power from the solar cell module to the power conditioner. The supply start voltage referred to at the time and the supply stop voltage referred to when determining whether to stop the supply correspond to or correspond to the start voltage and the stop voltage determined for each model of the power conditioner. It may be further provided with a voltage value switching setting unit for arbitrarily setting, switching or adjusting.

Further, in the solar power generation system provided with the solar cell module deterioration prevention function according to the present invention, in the open / close control unit, the voltage of the power generated by the solar cell module is the supply start voltage for a predetermined time or more. When the above occurs, the mechanical switch is operated to start supplying the power generated by the solar cell module to the power conditioner, and the voltage of the power generated by the solar cell module is set to a predetermined time or more. When the voltage becomes equal to or lower than the supply stop voltage, the mechanical switch may be operated to control the power generated by the solar cell module by a timer function for stopping the supply to the power conditioner.

In the present invention, in a solar power generation system including a power conditioner to which a storage battery is connected (or built-in), the open / close control unit determines the power generated by the solar cell module based on the output from the power generation voltage detection unit. When the voltage becomes equal to or higher than the supply start voltage that can be set or adjusted in advance so as to correspond to or match the starting voltage different for each model of the power conditioner, the power generated from the solar cell module is said to be the same. The supply to the power conditioner is started, and the supply stop that can be set or adjusted in advance so that the voltage of the power generated by the solar cell module corresponds to or matches the stop voltage different for each model of the power conditioner. When the voltage becomes lower than the voltage, the connection opening / closing unit is controlled so as to stop the supply of the generated power from the solar cell module to the power conditioner.

Therefore, according to the present invention, in a photovoltaic power generation system in which a power conditioner to which a storage battery is connected is connected so as to be activated by power generated from the solar cell module, both are between the solar cell module and the power conditioner. By simply adding an external device that electrically connects or disconnects between them, it is not affected by the difference in the make and model of the power conditioner built into the photovoltaic power generation system, and at night. It is possible to easily and inexpensively prevent the deterioration and output reduction phenomenon of the solar cell module mainly caused by the voltage from the power conditioner being applied to the solar cell module even when the solar cell module is not operating. It will be like.

Further, in the present invention, the supply start voltage referred to when the voltage value switching setting unit determines whether or not the open / close control unit starts supplying the generated power from the solar cell module to the power conditioner. , And the supply stop voltage referred to when the open / close control unit determines whether or not to stop the supply corresponds to or conforms to the start voltage and the stop voltage determined for each model of the power conditioner. When it is possible to set, switch or adjust to, refer to when the opening / closing control unit controls the connection opening / closing unit to start supplying the generated power by the solar cell module to the power conditioner. The supply starting voltage to be supplied can be set extremely easily according to or adapted to the starting voltage peculiar to each model of the power conditioner, and the open / close control unit controls the connection open / close unit to control the sun. The supply stop voltage referred to when determining when to stop the supply of the power generated by the battery module to the power conditioner is set extremely easily according to or adapted to the stop voltage unique to each power conditioner model. You will be able to do the same.

Further, in the present invention, when the voltage of the power generated by the solar cell module becomes equal to or higher than the supply start voltage for a predetermined time or longer, the mechanical switch is operated to generate power of the solar cell module. When the supply to the power conditioner is started and the voltage of the power generated by the solar cell module becomes equal to or lower than the supply stop voltage for a predetermined time or more, the mechanical switch is operated or stopped to operate. When the timer function that stops the supply of the power generated by the solar cell module to the power conditioner is used for control, the increase in power at the start of power generation by the solar cell module such as when the weather is unstable or in the morning The state of the power conditioner supply of the power conditioner of the generated voltage by the solar cell module when the situation is unstable, and the state of the power decrease at the end of the power generation by the solar cell module in bad weather or in the evening are unstable. It becomes possible to effectively prevent the phenomenon that the mechanical switch repeatedly turns on and off at short intervals (several seconds to several minutes), which occurs when the supply of the power conditioner of the generated voltage by the solar cell module is stopped. ..

It is a schematic diagram which shows the whole structure of the photovoltaic power generation system provided with the solar cell module deterioration prevention function which concerns on one Embodiment of this invention. It is a circuit block diagram which shows the electric structure of this embodiment. In this embodiment, it is a flowchart which shows an example of the operation (timer function) of the CPU for preventing the phenomenon that a mechanical switch repeats ON / OFF at a short interval (a few seconds to a few minutes). It is a graph which shows an example of the operation of the relay circuit in this embodiment. It is a schematic diagram which shows the photovoltaic power generation system provided with the solar cell module deterioration prevention function proposed in Patent Document 1.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an overall configuration of a photovoltaic power generation system having a solar cell module deterioration prevention function according to an embodiment of the present invention, and FIG. 2 is a circuit block diagram showing an electrical configuration of the present embodiment.

In FIG. 1, 1 is a solar cell module, 2 is a power conditioner, and 3 is a relay circuit (relay box) connected between the solar cell module 1 and the power conditioner 2. A storage battery (see reference numeral 4 in FIG. 2) is connected to the power conditioner 2. Further, the power conditioner 2 is configured to be started and operated by the electric power generated from the solar cell module 1. Further, a control unit (see CPU 12 and the like in FIG. 2) including a microcomputer for controlling the relay circuit 3 is connected to the relay circuit 3.

When the rising sun rises and the generated voltage of the solar cell module 1 rises above a specified value (supply start voltage), the control unit turns on the relay circuit 3 and electrically connects the solar cell module 1 and the power conditioner 2. When the sun goes down and the generated voltage of the solar cell module 1 becomes equal to or less than the specified value (supply stop voltage), the relay circuit is turned off and the solar cell module 1 and the power conditioner 2 are electrically connected to each other. Cut off. The purpose is to prevent the voltage to ground (voltage of the power conditioner 2) from being applied to the solar cell module 1 when the solar cell module 1 is not generating power. In this embodiment, an auxiliary power supply (AC100 / 200V shared) for holding the relay of the relay circuit 3 is provided, but it may not be provided.

Next, in FIG. 2, 3 is a relay circuit (relay box) connected between the solar cell module 1 and the power conditioner 2, 4 is a storage battery connected to the power conditioner 2, and 5 is the power conditioner. 2 is a connected commercial power system.

Next, the configuration of the relay circuit 3 will be described. In FIG. 2, reference numeral 11 denotes a relay opening / closing unit that electrically connects or disconnects between the solar cell module 1 and the power conditioner 2. Further, 12 starts supplying the generated power from the solar cell module 1 to the power conditioner 2 when the generated power generated by the solar cell module 1 rises above a predetermined supply starting voltage, and also starts supplying the generated power from the solar cell module 1 to the power conditioner 2. The CPU controls the relay opening / closing unit 11 so as to stop the supply of the generated power from the solar cell module 1 to the power conditioner 2 when the power generated by 1 drops below a predetermined supply stop voltage. In the present embodiment, the CPU 12 is connected to the solar cell module 1 via a voltage conversion circuit or the like, which will be described later, so as to operate by the electric power generated from the solar cell module 1.

Further, in FIG. 2, 13 is a voltage conversion circuit that converts the generated power from the solar cell module 1 into a predetermined voltage, 14 is a CPU power supply that supplies power from the voltage conversion circuit 13 to the CPU 12, and 15 is the above. A relay power supply that supplies power from the voltage conversion circuit 13 to the relay switching unit 11 side, 16 is a voltage detection circuit that detects the voltage of the power generated by the solar cell module 1 and outputs it to the CPU 12, and 17 is from the CPU 12. This is a relay output circuit that receives the output of the above and outputs a signal for controlling the relay drive unit (coil) 11a.

Further, in FIG. 2, reference numeral 18 is a setting of a supply start voltage (ON voltage) referred to when the CPU 12 determines whether or not to start supplying the generated power from the solar cell module 1 to the power conditioner 2. The ON voltage setting unit 19 for performing the above, etc. refers to a supply stop voltage (OFF) referred to when the CPU 12 determines whether or not to stop the supply of the generated power from the solar cell module 1 to the power conditioner 2. This is an OFF voltage setting unit for setting voltage) and the like. In FIG. 2, reference numeral 21 denotes a switch used when the solar cell module 1 is electrically cut off from other parts for construction, repair, maintenance, and the like.

In the present embodiment, the ON voltage setting unit 18 and the OFF voltage setting unit 19 are configured by, for example, a dial switch that can select and change voltage values in a plurality of stages at 5V intervals from 25V to 95V in advance. ing. Therefore, for example, when the contractor externally attaches a device provided with the relay circuit (relay box) 3 to the electricity storage hybrid type solar power generation system, the supply start referred to when the CPU 12 controls the relay opening / closing unit 11. Easily set, switch or set the voltage (ON voltage) and supply stop voltage (OFF voltage) to accommodate or match the start and stop voltages specific to each model of power conditioner already built into the system. It can be adjusted.

Further, in FIG. 2, when the CPU 12 determines whether or not the voltage of the power generated by the solar cell module 1 is equal to or higher than the supply start voltage (ON voltage) or lower than the supply stop voltage (OFF voltage). It is a delay time setting unit for setting the measurement / judgment time of. The delay time setting unit 20 determines to the CPU 12 whether or not the voltage of the generated power of the solar cell module 1 is equal to or higher than the supply start voltage (ON voltage) or lower than the supply stop voltage (OFF voltage). The purpose is to have a function (timer function) that repeats only the time, and to set a time (delay time) for repeating the determination.

That is, if the voltage value of the power generated by the solar cell module input from the voltage detection circuit 16 becomes higher than the supply start voltage (ON voltage) for a moment, the relay opening / closing unit 11 is immediately turned on. When the power generated by the solar cell module 1 is started to be supplied to the power conditioner 2, the power generation is unstable and the generated power fluctuates, for example, when the weather is unstable or in the early morning. Since the voltage is severe, the relay opening / closing unit 11 repeatedly turns ON / OFF at short intervals (several seconds to several minutes). Therefore, in the present embodiment, the CPU 12 repeats the determination of whether or not the voltage value of the power generated by the solar cell module becomes equal to or higher than the supply start voltage (ON voltage) for a predetermined delay time set in advance. (See steps S2 and S3 in FIG. 3), and when it is determined that the supply start voltage (ON voltage) or higher is reached in all of the delay times, the relay switching unit 11 is turned on for the first time (step in FIG. 3). (See S4), the power generated by the solar cell module 1 is started to be supplied to the power conditioner 2, whereby the relay opening / closing unit 11 is turned on / off at short intervals (several seconds to several minutes) at the start of the supply. The phenomenon of repeating OFF is prevented from occurring.

Further, if the voltage value of the generated power of the solar cell module input from the voltage detection circuit 16 becomes equal to or lower than the supply stop voltage (OFF voltage) for a moment, the relay opening / closing unit 11 is immediately turned off. When the supply of the generated power by the solar cell module 1 to the power conditioner 2 is stopped, the power generation is unstable and the generated power fluctuates, for example, in bad weather or in the evening. Since it is intense, a phenomenon occurs in which the relay opening / closing unit 11 repeatedly turns ON / OFF at short intervals (several seconds to several minutes). Therefore, in the present embodiment, the CPU 12 repeats the determination of whether or not the voltage value of the power generated by the solar cell module is equal to or lower than the supply stop voltage (OFF voltage) for a predetermined delay time set in advance. (See steps S5 and S6 in FIG. 3), and the relay switching unit 11 is turned off for the first time when it is determined that the supply stop voltage (OFF voltage) or less is reached in all of the delay times (step S7 in FIG. 3). (See), the supply of the generated power generated by the solar cell module 1 to the power conditioner 2 is stopped, whereby the relay opening / closing unit 11 is turned on / off at short intervals (several seconds to several minutes) when the supply is stopped. I tried to prevent the occurrence of the phenomenon that repeats.

The delay time setting unit 20 is the time during which the CPU 12 repeats the determination of whether or not the voltage value of the power generated by the solar cell module 1 is equal to or higher than the supply start voltage (ON voltage), or the power generated by the solar cell module 1. The time for the CPU 12 to repeat the determination of whether or not the voltage value of the electric power has become equal to or lower than the supply stop voltage (OFF voltage) can be arbitrarily set and adjusted within, for example, several seconds to several tens of seconds. It was done.

Next, the operation of this embodiment will be described. In the present embodiment, before the contractor operates the photovoltaic power generation system, the ON voltage setting unit 18 and the OFF voltage setting unit 19 transfer the CPU 12 to the power conditioner 2 of the power generated from the solar cell module 1. The supply start voltage and supply stop voltage referred to when determining whether to start and stop the supply of the power conditioner 2 are set so as to correspond to and match the start voltage and stop voltage peculiar to each model of the power conditioner 2. And so on.

Further, in the present embodiment, the contractor starts and stops the supply of the power generated from the solar cell module 1 to the power conditioner 2 by the CPU 12 by the delay time setting unit 20 before the system is operated. Time to repeat the determination when the determination of whether the voltage value of the power generated by the solar cell module 1 is equal to or higher than the supply start voltage or equal to or lower than the supply stop voltage is repeated for a predetermined time (timer function). As a result, an arbitrary time (arbitrary time in several to several hundred seconds) corresponding to and suitable for the surrounding environment in which the photovoltaic power generation system is installed is set.

Then, the CPU 12 is preset so that the voltage of the power generated by the solar cell module 1 corresponds to or matches the starting voltage peculiar to each model of the power conditioner 2 based on the output from the voltage detection circuit 16. When it is repeatedly determined that the supply start voltage has exceeded the set delay time for a preset delay time (see steps S2 and S3 in FIG. 3), the relay output circuit 17 is controlled to turn on the relay switching unit 11 (FIG. 3). 3), the supply of the power generated by the solar cell module 1 to the power conditioner 2 is started.

Further, the CPU 12 is preset so that the voltage of the power generated by the solar cell module 1 corresponds to or matches the stop voltage peculiar to the model of the power conditioner 2 based on the output from the voltage detection circuit 16. When it is repeatedly determined that the voltage has fallen below the supply stop voltage for a preset delay time (see steps S5 and S6 in FIG. 3), the relay output circuit 17 is controlled to turn off the relay switching unit 11 (FIG. 3). Step S7), the supply of the generated power by the solar cell module 1 to the power conditioner 2 is stopped.

Next, FIG. 4 is a graph showing the operation of the relay circuit 3 in the present embodiment. In FIG. 4, A is the generated voltage of the solar cell module, and B is the operating voltage (the supply start voltage or the supply start voltage referred to when the CPU 12 determines whether to start or stop the power conditioner 2 and controls the relay circuit 3). Supply stop voltage), C indicates a relay connection operation (relay ON / OFF operation). From FIG. 4, in the present embodiment, the CPU 12 starts and stops the supply of the power generated by the solar cell module 1 to the power conditioner 2 with respect to the output fluctuation of the power generation by the solar cell module 1. It can be seen that the determination is performed after repeating the determination in a predetermined delay time (timer function).

As described above, in the present embodiment, the CPU 12 has a starting voltage in which the voltage of the power generated by the solar cell module 1 is different for each model of the power conditioner 2 based on the output from the voltage detection circuit 16. When it is determined that the supply start voltage is equal to or higher than the preset supply start voltage and the same determination as described above is repeated within a predetermined delay time, the power conditioner 2 of the power generated from the solar cell module 1 is used. At the same time as starting the supply to, it is determined that the voltage of the power generated by the solar cell module 1 is equal to or lower than the supply stop voltage preset to correspond to or match the stop voltage different for each model of the power conditioner 2. In addition, when the same determination as described above is repeated within a predetermined delay time, the connection opening / closing unit is controlled so as to stop the supply of the generated power from the solar cell module 1 to the power conditioner 2. ..

Therefore, according to the present embodiment, in the photovoltaic power generation system in which the power conditioner 2 to which the storage battery 4 is connected is connected so as to be activated by the power generated from the solar cell module 1, the solar cell module 1 and the power conditioner ( By simply attaching a relay circuit (relay box) 3 that electrically connects or cuts off between the inverter) 2 and the solar power generation system, the manufacturer of the power conditioner 2 incorporated in the photovoltaic power generation system can be used. Deterioration of the solar cell module 1 mainly due to the fact that the voltage from the power conditioner 2 is applied to the solar cell module even during the time when the solar cell module 1 is not operating, such as at night, without being affected by the difference in model. -It will be possible to prevent the output reduction phenomenon easily and inexpensively.

Further, in the present embodiment, as described above, the relay opening / closing unit is only when the voltage of the generated power by the solar cell module 1 becomes equal to or more than the predetermined delay time and the supply start voltage. 11 is operated to start supplying the power generated by the solar cell module 1 to the power conditioner 2, and the voltage of the power generated by the solar cell module 1 is supplied for a predetermined delay time or longer. Only when the voltage becomes equal to or lower than the stop voltage, the relay opening / closing unit 11 is operated to perform control by a timer function for stopping the supply of the generated power by the solar cell module 1 to the power conditioner 2. Therefore, according to the present embodiment, the power generation is supplied to the power conditioner 2 when the weather is unstable or when the power increase at the start of power generation by the solar cell module 1 is unstable, such as in the early morning. It occurs when the supply of the generated power to the power conditioner 2 is stopped at the start and when the state of the power decrease at the end of the power generation by the solar cell module 1 is unstable, such as when the weather is bad or in the evening. It becomes possible to effectively prevent the phenomenon that the relay opening / closing unit 11 repeatedly turns ON / OFF at short intervals (several seconds to several minutes).

Further, in the present embodiment, the ON voltage setting unit 18 and the OFF voltage setting unit 19 determine whether or not the CPU 12 starts supplying the generated power from the solar cell module 1 to the power conditioner 2. The supply stop voltage referred to when determining whether or not to stop the supply of the generated power from the CPU 12 solar cell module 1 to the power conditioner 2 is referred to as each power. It is possible to set, switch or adjust, for example, with a dial switch type so as to correspond to or match the start voltage and stop voltage peculiar to each model of the conditioner 2. Therefore, according to the present embodiment, the supply start voltage when the CPU 12 controls the relay circuit (relay box) 3 to start supplying the generated power by the solar cell module 1 to the power conditioner 2 is extremely high. It is possible to easily correspond to and adapt to the starting voltage of each model of each power conditioner 2, and the CPU 12 controls the relay circuit (relay box) 3 to use the power generated from the solar cell module 1 as the power conditioner. The supply stop voltage at the time of stopping the supply so as not to supply to 2 can be made to correspond to and adapt to the stop voltage of each model of each power conditioner 2 very easily.

Although the embodiments of the present invention have been described above, the present invention is not limited to those described as the above-described embodiments, and various modifications and modifications can be made. For example, in the above-described embodiment, the DC relay circuit 3 is shown as a connection opening / closing unit that electrically connects or disconnects between the solar cell module and the power conditioner, but the present invention is not limited to this. Of course, various other conventionally known connection opening / closing means can be used.

1 Solar cell module 2 Power conditioner 3 Relay circuit (relay box)
4 Storage battery 11 Relay opening / closing part 11a Relay drive part (coil)
12 CPU
13 Voltage conversion circuit 14 CPU power supply 15 Relay power supply 16 Voltage detection circuit 17 Relay output circuit 18 ON voltage setting unit 19 OFF voltage setting unit 20 Delay time setting unit

Claims (3)

A power conditioner that is electrically connected to the solar cell module, a storage cell that stores electric power from the solar cell module or the grid power source, and is started and operated by the generated power from the solar cell module. In a solar power generation system equipped with
A power generation voltage detector that detects the voltage of the power generated by the solar cell module,
A connection opening / closing unit externally attached between the solar cell module and the power conditioner, which electrically connects or disconnects between the solar cell module and the power conditioner, and a connection opening / closing unit .
An opening / closing control unit that controls the connection opening / closing unit so that the voltage from the power conditioner is not applied to the solar cell module when the solar cell module is not generating power, and the output from the generated power generation voltage detection unit. Based on this, when the voltage of the power generated by the solar cell module becomes equal to or higher than the supply start voltage, the power of the power generated from the solar cell module is electrically connected between the solar cell module and the power conditioner. When the supply to the conditioner is started and the voltage of the power generated by the solar cell module becomes equal to or lower than the supply stop voltage, the solar cell module and the power conditioner are electrically cut off from the solar cell module. An open / close control unit that stops the supply of the generated power to the power conditioner,
Connected to the open / close control unit, the open / close control unit determines "whether or not the solar cell module and the power conditioner are electrically connected and whether or not they are electrically cut off". The reference voltage values to be referred to, supply start voltage and supply stop voltage, are set, switched or adjusted so as to correspond to or match the start voltage and stop voltage unique to each model of the power conditioner. A voltage value switching setting unit for setting, switching, or adjusting the reference voltage value by an operator who externally attaches the connection opening / closing unit .
A photovoltaic power generation system with a function to prevent deterioration of the solar cell module, which is characterized by being equipped with. The open / close control unit controls the connection open / close unit when the voltage of the power generated by the solar cell module becomes equal to or higher than the supply start voltage for a predetermined time or longer, and the power generated by the solar cell module is generated. When the supply to the power conditioner is started and the voltage of the power generated by the solar cell module becomes equal to or less than the supply stop voltage for a predetermined time or more, the connection switching unit is controlled to control the solar cell module. The solar power generation system having the function of preventing deterioration of the solar cell module according to claim 1, wherein the supply of the power generated by the solar cell to the power conditioner is stopped. A time is set for repeatedly determining whether or not the voltage of the power generated by the solar cell module is equal to or higher than the supply start voltage and whether or not the voltage of the power generated by the solar cell module is equal to or lower than the supply stop voltage. The photovoltaic cell power generation system provided with the solar cell module deterioration prevention function according to claim 2, characterized in that it is provided with a time setting unit that can be set by a person .

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