JP6796432B2 - Power generation system - Google Patents

Description

The present invention relates to a power generation system including a power generation device that uses natural energy such as solar power and wind power, and a power conditioner that converts the electric power generated by the power generation device from direct current to alternating current.

Conventionally, in the power generation system using the natural energy, a photovoltaic power generation system whose maximum power generation amount exceeds the output capacity of the power conditioner may be installed in consideration of the stable supply of the amount of power to be sold and the unit price of power sale. is there. It is a so-called over-module, a power generation system called overload. Here, in the power generation system, the electric power exceeding the capacity of the power conditioner is naturally not sold. However, the above-mentioned over-module power generation system may be adopted for the following reasons.

For one thing, over-module power generation systems can sell more power. That is, comparing the case where the overmodule power generation system is adopted and the case where the overmodule power generation system is not adopted, as shown in the graph showing the amount of power generation for each hour in FIG. 7, when the overmodule is not adopted, the power condition is adjusted. Since the electric power exceeding the output capacity of the power conditioner is not sold, the peak of the power generation amount is set so as not to exceed the output capacity of the power conditioner, and the power generation amount of the curve A shown by the solid line in FIG. 7 is obtained. On the other hand, when the over-module is adopted, the output capacity of the power conditioner is exceeded, and the amount is cut by the so-called peak cut and becomes flat, resulting in the amount of power generated on the curve B shown by the alternate long and short dash line in FIG. Comparing the amount of power sold between the two, when the overmodule is adopted, a larger amount of power generation can be sold by the integrated amount shown by the diagonal line in FIG. 7 as compared with the case where this is not adopted. In the curve B of FIG. 7, the portion above the peak cut indicates a case where the amount of solar radiation is large and the amount of power generation is close to the maximum in fine weather. Naturally, this amount of power generation does not always occur. Absent.

Another reason is that in the case of an over-module power generator, the maintenance cost may be reduced. The scale of a power plant is determined by the smaller of the output capacity of the power conditioner and the generated power, but if the value is less than 50 kW, the procedure for notification etc. as a general electric facility is required. Not needed. On the other hand, in the case of a power plant of 50 kW or more, there is a provision to set up a chief electrical engineer as an electric facility for private use, and it is also necessary to notify the safety regulations, and further, according to the standard specified by the Ordinance of the Ministry of Economy, Trade and Industry. There is also an obligation to maintain conformity. Therefore, if the output capacity of the power conditioner is kept small, it is recognized as a power plant as a general electric facility, and the maintenance cost is low.

As described above, by using an overmodule, the amount of power generation can be increased, the amount of electricity that can be stably supplied and the amount of electricity that can be sold can be increased, and the power condition can be increased from the viewpoint of the scale of the power plant. The maintenance cost can be reduced by reducing the size of the power plant to make it an overmodule.

Regarding the over-module power generation system, the power generation system technology described in Patent Document 1 is disclosed. In this power generation system, the ratio of the rated output of the photovoltaic power generation unit to the rated output of the power conditioner is 140% or more, and according to this, power can be stably supplied to the power system.

Japanese Unexamined Patent Publication No. 2014-16609

However, in the power generation system of the conventional power conditioner, the amount of power generation exceeding the output capacity of the power conditioner is removed as a peak cut and discarded. For this reason, the amount of power generated that exceeds the output capacity of the power conditioner was wasted.

Therefore, an object of the present invention is to provide a power generation system that can effectively use the power generated by exceeding the output capacity of the power conditioner without wasting the power generated by natural energy.

The power generation system of claim 1 is a power generation device that uses natural energy to generate power, a measuring device that measures the amount of power generated by the power generation device, and a power conditioner that converts the power generated by the power generation device from DC to AC. The maximum power generation amount of the power generation device exceeds the output capacity of the power conditioner, and a part of the output destination of the power generated by the power generation device is loaded from the power conditioner. The device is provided with a switch element that can be switched , and the power generated by the power generation device measured by the measuring device exceeds the output capacity of the power conditioner , and the power is also after the switching. When the amount of power generated by the output capacity of the conditioner can be maintained, the output destination of a part of the generated power is switched .

In the power generation system of claim 2, the power generation device includes a photovoltaic power generation module, and the load device comprises a cooling device that cools at least one of the photovoltaic power generation module and the power conditioner.
In the power generation system of claim 3, the power generation device includes a photovoltaic power generation module, the load device comprises a cooling device for cooling the photovoltaic power generation module, and the photovoltaic power generation module is on the side opposite to the light receiving surface. It is installed to cool from the surface of.

The power generation system according to claim 4 is the power generation when the power generation device is composed of a plurality of different types of power generation devices and the power generated by the plurality of power generation devices exceeds the output capacity of the power conditioner. The output destination of the generated power can be switched by the switch element for each type of device.

In the power generation system of claim 5, the power generation device is composed of an array in which a plurality of strings in which a plurality of the photovoltaic power generation modules are connected in series are connected in parallel, and the power generated by the power generation device is the power. When the output capacity of the conditioner is exceeded, the switch element capable of switching the output destination of the power generated by the same number of the photovoltaic power generation modules in each of the strings to the load device is attached to the strings. It is prepared.
In the power generation system of claim 6, the power generation device is composed of an array in which a plurality of strings in which a plurality of the photovoltaic power generation modules are connected in series are connected in parallel, and the power generated by the power generation device is the power. Each string is provided with a switch element capable of switching the output destination of the power generated by some of the strings to the load device when the output capacity of the conditioner is exceeded.

The power generation system according to claim 7 is capable of adjusting the amount of electric power output to the load device according to the amount of electric power generated by the power generation device exceeding the output capacity of the power conditioner.

The invention of claim 1 switches a part of the output destination of the electric power generated by the power generation device from the power conditioner to the load device when the electric power generated by the power generation device exceeds the output capacity of the power conditioner. Since it is equipped with a possible switch element, it is possible to supply power that exceeds the output capacity of the power conditioner, which has been discarded in the past, to the load device for effective use.

According to the second and third aspects of the invention, since the load device includes a cooling device, the electric power that has been wasted in the past is turned to the cooling device for effective use, and the cooling device cools the photovoltaic power generation module or the power conditioner. By doing so, it is possible to increase the power generation efficiency and increase the amount of power generation.

According to the invention of claim 4, when the power generated by the plurality of power generation devices exceeds the output capacity of the power conditioner, the output destination of the generated power can be switched for each type of power generation device. Therefore, for example, by installing a power generation device corresponding to two types of natural energy, it is possible to make it less affected by the weather conditions.

According to the invention of claim 5, when the electric power generated by the power generation device exceeds the output capacity of the power conditioner, the power generation amount of the same number of photovoltaic power generation modules in each string can be switched to the load device. Therefore, the power of some modules can be supplied to the load device in a well-balanced manner from each string.
In the invention of claim 6, when the electric power generated by the power generation device exceeds the output of the power conditioner, only the electric power generated by a part of the strings needs to be switched to the load device, so that the switching device is simplified. To become.

Regarding the invention of claim 7, if the power generation amount exceeding the output capacity of the power conditioner is effectively used by the load device at one time, the power generation amount will be considerably lower than the output capacity of the power conditioner. It is necessary to switch by the switch element to return to the power conditioner side. However, according to the invention of claim 7, since the amount of power to be switched to the load device can be adjusted from the amount of power generation exceeding the output capacity of the power conditioner, the amount of power generation is adjusted according to the amount exceeding the output capacity of the power conditioner. As a result, it is possible to avoid frequent switching between the power selling system and the load device as the output destination of the excess power.

It is a block diagram which shows the state when the amount of power generation is less than the output capacity of a power conditioner in the power generation system of embodiment of this invention. It is a block diagram which shows the state when the power generation amount exceeds the output capacity of a power conditioner in the power generation system of FIG. It is a graph which shows typically the amount of power generation per day in the power generation system of FIG. It is a graph which shows the daily power generation amount when the cooling device is operated in the power generation system of FIG. It is a block diagram which shows typically the state when the power generation amount is less than the output capacity of a power conditioner in the power generation system of another embodiment of this invention. It is a block diagram which shows the state when the power generation amount exceeds the output capacity of a power conditioner in the power generation system of FIG. It is a graph which schematically explains the overmodule of a power generation system.

Hereinafter, the power generation system according to the embodiment of the present invention will be described with reference to the drawings. The power generation device of the power generation system of the present invention uses natural energy such as solar power, wind power, wave power, tidal power, running water, geothermal power, and biomass to generate power. In the present embodiment, among these, a power generation device including a solar power generation module (hereinafter, simply referred to as “module”) and using sunlight will be illustrated.

In FIG. 1, in the power generation system 1 of the present embodiment, the power generation device 11 using sunlight, the measuring device 21 for measuring the amount of power generated by the power generation device 11, and the power generated by the power generation device 11 are exchanged from direct current. It is equipped with a power conditioner 22 that converts to.

The power generation device 11 is composed of an array 12 in which 10 modules 13 are connected in series to form a string 14, and 5 of these strings 14 are connected in parallel.

The electric power generated by the array 12 is measured by the measuring device 21. Then, the electric power measured by the measuring device 21 is sent to the power conditioner 22. The power conditioner 22 converts the electric power generated by the array 12 from direct current to alternating current to stabilize the output. Subsequently, the AC power converted by the power conditioner 22 is output to the commercial system 23 and sold.

Further, the power generation amount data measured by the measuring device 21 is sent to a determination device (not shown), and this determination device determines whether or not the power generation amount exceeds the threshold, and the data is a switching control device (not shown). The control signal sent to the switch element 15 and generated there is output to the switch element 15 described later to operate the switch element 15.

In addition, the power generation device 11 outputs a part of the electric power generated by the array 12 to the load device 24. Examples of the load device 24 include a cooling device of the module 13, a cleaning device of the module 13, a battery for self-storage, an illuminating lamp, and the like, and a part of the electric power generated by the array 12 may be used at a predetermined time described later. It is used as electric power to operate the equipment of.

The circuit of the array 12 is provided with a switch element 15 for switching a part of the electric power for sale generated by the array 12 and supplying it to the load device 24 at a predetermined time. In the present embodiment, as shown in FIG. 1, one switch element 15 is provided as a first switch 15a in each of the five parallel strings 14, and a first switch element 15 is provided between each string 14 and the load device 24. Two switches 15b are provided one by one. In FIG. 1, which schematically shows the circuit, in all the strings 14, the first switch 15a is closed, all the modules 13 are connected to the power conditioner 22, and the second switch 15b is open. None of the modules are connected to the load device 24.

In the present embodiment, the rated output of the array 12 is 65 kW, and the output capacity of the power conditioner 22 is set to 49 kW. Therefore, the power generation system 1 can sell a maximum output of 49 kW.

The daily power generation amount of the power generation system 1 configured in this way changes in a chevron shape according to the amount of solar radiation, and becomes, for example, the value shown by the curve of the graph of FIG. Here, since the amount of power generation per day is greatly affected by the amount of solar radiation in fine weather, cloudy weather, rainy weather, etc., the rated output of the array 12 is 65 kW, but on days with low solar radiation such as cloudy weather, the maximum power generation amount is. Normally, the output capacity of the power conditioner 22 is lower than that of the power conditioner 22, and on a sunny day with a large amount of solar radiation, the maximum power generation amount may exceed the output capacity of the power conditioner 22 as shown by a single point chain line in FIG. In FIG. 3, the amount of power generated from 9:30 to 14:30 in the daytime is restricted by the output capacity of the power conditioner 22, and the amount of power generated beyond that indicated by the alternate long and short dash line is removed as a peak cut. A certain amount of 49 kW of electricity is sold during the time period. The output capacity of the power conditioner 22 and the integrated electric energy of the portion surrounded by the alternate long and short dash line have not been sold in the past, but have been grounded to the ground and discarded.

However, in the power generation system 1 of the present embodiment, when the generated power exceeds the output capacity of the power conditioner 22, the output destination of the integrated power amount of the portion surrounded by the output capacity of the power conditioner 22 and the one-point chain wire. Is switched from the power conditioner 22 to the load device 24 by the switch element 15 according to the integrated electric energy, and the electric power turned to this is used as the electric power for operating the load device 24.

Regarding the switching of the switch element 15, specifically, when the amount of solar radiation is small and the amount of power generated by the power generation device 11 does not exceed the output capacity of the power conditioner 22, that is, the amount of power generated is all the time of day. When the output capacity of the power conditioner 22 is 49 kW or less, as shown in FIG. 1, the first switch 15a of each string 14 is in a closed state, and the second switch 15b of each string 14 is all closed. It is in the open state. At this time, the total power of the array 12 in which five strings 14 in which ten modules 13 are connected in series are arranged in parallel is output to the power conditioner 22, converted into AC power, and sold to the commercial system 23. Will be done.

On the other hand, when the amount of solar radiation is large and the amount of power generated by the power generation device 11 exceeds the output capacity of the power conditioner 22, that is, the amount of power generation exceeds the output capacity of 49 kW of the power conditioner 22 at any time of the day. At that time, the data of the measuring device 21 is output to a determination device (not shown), the necessity of switching is determined, and the switching signal is output to each switch element 15 by the switching control device (not shown). As a result, as shown in FIG. 2, the first switch 15a of each string 14 is in an open state, and the second switch 15b of each string 14 is in a closed state.

At this time, in each string 14, the electric power generated by the remaining eight modules 13 excluding the lower two modules 13 shown by the diagonal lines in FIG. 2 is output to the power conditioner 22 and converted into AC power. The power is sold to the commercial system 23. Then, the electric power generated by the lower two modules 13 indicated by the diagonal lines of each string 14 is output to the load device 24. That is, 8/10 of the total power generation amount is sold, and a part of the power generation generated by the array 12, that is, 2/10 of the total power generation amount is used for the power to operate the load device 24. In this case, since the power generation device 11 supplies the electric power of two modules 13 from each string 14 to the load device 24, the electric power of some of the modules 13 can be supplied to the load device 24 in a well-balanced manner. ..

In this embodiment, the number of modules 13 that can be switched to the load device 24 is two in one string 14, but the number is not limited to this number, and the load device is in five parallel strings 14. The number of modules 13 that can be switched to 24 may be different from each other.

Next, examples of the load device 24 that outputs a part of electric power include various devices such as the above-mentioned cooling device, the cleaning device of the module 13, and the battery for private storage. In this embodiment, the cooling device of the module 13 is illustrated. Here, the output power of the module 13 is represented by an instantaneous power at a temperature of 25 ° C., and when the module 13 receives solar energy, the temperature rises, and the power generation efficiency decreases accordingly. On the contrary, when the solar module 13 is cooled from 25 ° C. to 20 ° C. or the like, the power generation efficiency increases. Although the cooling device is intended to cool the module 13, it may be one that cools the power conditioner 22 or a cooling device that cools both the module 13 and the power conditioner 22. ..

Therefore, when the amount of power generated by the array 12 exceeds the output capacity of the power conditioner 22, if a part of the electric power is switched to the cooling device of the module 13, the fan of the cooling device switches all or part of the module 13. After cooling, the amount of power generated by the module 13 gradually increases from the time when the module 13 begins to cool, and the amount of power generated by the array 12 is point a as shown by the two-point chain line in FIG. 4 if there is no peak cut. , B, C, D, C', B'The integrated power amount surrounded by the curve increases. However, in reality, the portion exceeding the output capacity of the power conditioner 22 is peak-cut, so the portion of the increase in the amount of power generation due to the cooling of the module 13 is surrounded by points c, d, and c in FIG. It is the integrated electric energy shown by the diagonal line.

The cooling device uses a fan for cooling, and is installed so as to cool the module 13 from the side opposite to the light receiving surface. As a result, when the wind blows from the outside, the wind mainly hits the light receiving surface side of the module 13 and is hard to hit the surface opposite to the light receiving surface, so that the external wind hits the fan of the cooling device and rotates. It is possible to prevent the fan from becoming difficult to rotate due to the wind pressure from the outside. Further, when the cold air of the fan is applied to the back surface opposite to the light receiving surface of the module 13, the cold air rises along the back surface of the module 13 installed diagonally, and the module 13 can be cooled efficiently. In particular, the fan If is installed on the lower end side of the module 13, the cold air spreads over the entire back surface of the module 13, so that cooling can be performed more efficiently.

By the way, the output destination of a part of the generated electric power is switched from the power conditioner 22 to the load device 24 when the amount of power generated by the power generation device 11 exceeds the output capacity of the power conditioner 22. Strictly speaking, "when the value is exceeded" is not immediately after the value is exceeded, but is preferably a time point suitable for switching within a certain time range after the value is exceeded.

To explain this point, it is assumed that the amount of solar radiation is large and the amount of power generation exceeds the output capacity of the power conditioner 22 at about 9:30 am while the amount of power generation is increasing in a day. Immediately after that, when a part of the electric power is switched to the load device 24, the amount of electric power output to the power conditioner 22 decreases from the time of the switching, and the output capacity of the power conditioner 22 is considerably lower than that of the power conditioner 22. The amount of power that can be generated decreases. Therefore, when the output destination is switched to the power conditioner 22 side again, the amount of power generation further greatly exceeds the output capacity of the power conditioner 22. For this reason, it is necessary to switch to the load device 24 side in order to effectively utilize the excess again, and such switching is frequently repeated immediately after the output capacity of the power conditioner 22 is first exceeded. It is not preferable.

Therefore, in practice, the switching of the switch element 15 is performed even after the power generation amount exceeds the output capacity of the power conditioner 22, and then the power generation amount is expected to increase and the switch element 15 is switched to the load device 24 side. This is performed when it is expected that a power generation amount close to the output capacity of the Na 22 will be obtained. For this reason, it is preferable that the time when the amount of power generation “exceeds” the output capacity of the power conditioner 22 is not immediately after the amount of power generation exceeds, but a time appropriate for switching after the amount of power generation exceeds.

Next, when the switch element 15 is switched, all the power generation amount exceeding the output capacity of the power conditioner 22 is sent to the load device 24 at once, and the amount exceeds or exceeds the output capacity of the power conditioner 22. There is also a method of adjusting the amount of power output to the load device 24 according to the expected amount.

In the latter case, the amount of power to be sent to the load device 24 can be subdivided, and the amount of power generation can be gradually switched step by step while observing the situation of the amount exceeding or expected to exceed the output capacity of the power conditioner 22. it can. In this case, the switch elements 15 are provided at a plurality of locations in the circuit in the array 12. For example, in the case of FIGS. 1 and 2, although not shown, a switch is added between the bottom module 13 and the second module 13 from the bottom, and the amount of power generated by the array 12 is the power conditioner 22. Shortly after the output capacity is exceeded, this switch is opened to output only the amount of power generated by the bottom module 13 to the load device 24, and then when the amount of power generated by the array 12 further increases, the lower The amount of electric power can be finely adjusted by opening the switch between the second and third modules 13 and turning the output destination of the power generated by the second module 13 from the bottom to the load device 24. it can. At this time, the number of modules 13 to be switched in each string 14 may be the same, or the number of modules 13 to be switched may be different among the strings 14.

By the way, in the above embodiment, when the electric power generated by the array 12 exceeds the output capacity of the power conditioner 22, the electric power generated by the same number of modules 13 from each string 14 is switched to the load device 24. For example, as shown in FIGS. 5 and 6, only the electric power generated by a part of the strings 14 may be switched to the load device 24. In FIGS. 5 and 6, each string 14 does not have the first switch 15a shown in FIGS. 1 and 2, but the first switch 15c is provided on the measuring device 21 side and the second switch 15b is provided on the load device 24 side. It is provided.

In FIG. 5, the power generated by the array 12 is less than the output capacity of the power conditioner 22, and in all the strings 14, the first switch 15c is closed and connected, and the second switch 15b Is open and blocked. In this case, all the power generation amount of the array 12 is output to the power conditioner 22. On the other hand, in FIG. 6, the power generated by the array 12 exceeds the output capacity of the power conditioner 22, and only the leftmost string 14 in FIG. 6 has the first switch 15c open. , The second switch 15b is closed. In this case, the amount of power generated by the strings 14 in the remaining four rows excluding the leftmost string 14 is output to the power conditioner 22, and only the amount of power generated by the leftmost string 14 is the load device 24. Is supplied to. That is, 20% of the power generation amount of the array 12 is supplied to the load device 24.

Here, also in the case of switching in units of 14 strings shown in FIGS. 5 and 6, the amount exceeds or is expected to exceed the output capacity of the power conditioner 22 as in the case of switching in units of 13 modules described above. It is also possible to adjust the amount of power output to the load device 24 by switching in units of strings 14 according to the above. For example, in FIG. 6, only the amount of power generated by the leftmost string 14 is supplied to the load device 24, but the power generation amount of the array 12 is further increased due to the increase in the output capacity of the power conditioner 22. If you want to supply to 24, in addition to the leftmost string 14, another string 14 such as to the right of it can also be supplied to the load device 24 by switching the first switch 15c and the second switch 15b. , 40% of the power generation amount of the array 12 can be supplied to the load device 24.

By the way, in each of the above embodiments, when the electric power generated by the power generation device 11 exceeds the output capacity of the power conditioner 22, a part of the output destination of the electric power generated by the power generation device 11 is loaded from the power conditioner 22. Although it has been switched to the device 24, the present invention is not limited to this. That is, after the electric power generated by the power generation device 11 exceeds the output capacity of the power conditioner 22, a part of the output destination of the electric power of the power generation device 11 is limited to the one that switches from the power conditioner 22 to the load device 24. The output destination of a part of the electric power of the power generation device 11 is switched to the load device 24 for a part of time such as an arbitrary time or a set time while the output capacity of the power conditioner 22 is exceeded. For the rest of the time during the period, all the power generated by the power generation device 11 may be supplied for sale.

Specifically, in order to reduce the load on the load device 24, for example, when the load device 24 is a cooling device provided with a fan for cooling the module 13, the power generation device 11 is used to reduce the load on the fan motor. Of the time zone in which the power of the power conditioner 22 exceeds the output capacity of the power conditioner 22, a part of the power of the power generation device 11 is switched to the load device 24 to cool the module 13 only in the time zone when the amount of power generation is particularly large. It may be returned for sale after a lapse of time. As a result, the operating time of the fan motor can be shortened and the burden can be reduced. In this case, the load device 24 may be manually switched, or the temperature of the module 13 may be measured by the temperature measuring device and switched when it is detected that the measured value is higher than the set temperature, and then set. When the temperature drops to the temperature, it may be returned to the power sale, or a program is set by predicting the approximate time zone when the amount of power generation is particularly large, and when that time zone is reached according to the program, the switch element 15 is opened and closed. You may do it.

Next, the power generation system 1 of each of the above embodiments includes a power generation device 11, a power conditioner 22, and a load device 24, but these power generation devices 11, the power conditioner 22, and the load device 24 That is, one series having one power generation device 11, one power conditioner 22 and one load device 24 is provided, and another series is provided, and a total of two series are provided. In that case, the cooling device as the load device 24 cools the module 13 of its own power generation device 11 that supplies electric power to the cooling device, and also the power generation device 11 of the other series. The module 13 may be cooled, and further, the cooling devices of the load devices 24 of each series may cool the modules 13 of the power generation devices 11 of the other series.

Next, the operation of the power generation system 1 of the present embodiment will be described.
In the power generation system 1, when the electric power generated by the power generation device 11 exceeds the output capacity of the power conditioner 22, a part of the output destination of the electric power generated by the power generation device 11 is a load device from the power conditioner 22. Since the switch element 15 that can be switched to 24 is provided, the power that exceeds the output capacity of the power conditioner 22 that has been conventionally discarded can be supplied to the load device 24 and effectively used as the power of the load device 24.

When the load device 24 is a cooling device, the power generated in the past is turned to the cooling device and the solar power generation module 13 or the power conditioner 22 is cooled by the cooling device to improve the power generation efficiency and generate power. The amount can be increased.

Next, in the above embodiment, the power generation device 11 comprises a solar power generation device, but the power generation device 11 of the present invention includes a solar power plant, a wind power plant, a wave power plant, and geothermal power. It may be a combination of a plurality of different types of power generation devices such as a power plant. For example, exemplifying a power generation device 11 including a solar power plant and a wind power plant, the electric power generated by the solar power plant and the electric power generated by the wind power plant are sent to one measuring device 21. The combined amount of power is measured, and then both powers are output to one power conditioner 22, converted into AC power, and then sent to a commercial system 23 for sale.

On the other hand, the electric power generated by each power generation device 11 can be output to the load device 24 in the following cases. The power generation device 11 is provided with a switch element 15 that switches the output destination of the power generated for each type of power plant, which is each power generation device, from the power conditioner 22 to the load device 24. The switch element 15 is provided between the power plant and the measuring device 21 and between the power plant and the load device 24 in each of the solar power plant and the wind power plant.

In the power generation device 11 combined in this way, the total power generation amount, which is the sum of the power generation amount from the solar power plant and the power generation amount from the wind power plant, is measured by the measuring device 21, and the total power generation amount is the output of the power conditioner 22. When the capacity is exceeded, the power generated by either the solar power plant or the wind power plant can be output to the load device 24 by the switch element 15 for each type of power plant that is the power generation device. There is.

In the case of the power generation device 11 in which each of the power plants is combined, the power of the other type of power plant is transferred to the load device 24, particularly when the output of any one type of power plant is small and the amount of power generation is small. By turning it, it is possible to increase the amount of power generated by the power plant having a small amount of power generation. For example, when a solar power plant is used as a main power plant, the total power generation amount exceeds the output capacity of the power conditioner 22, but the power generation amount of the solar power plant is small due to solar radiation conditions or the like. By turning the power generated in the wind power plant to the cooling device which is the load device 24 and cooling the module 13 of the solar power plant with the fan, the power generation efficiency of the solar power plant is increased, and the power generation device 11 as a whole It is also possible to increase the power generation of.

Even if the power generation device 11 is composed of a plurality of power plants, for example, when all of them are composed of only the same type of photovoltaic power plants, the total power generation amount of the power generation device 11 is reduced due to the weather condition that the amount of solar radiation is small. However, as described above, if the power generation device 11 is a combination of a plurality of different types of power plants such as a solar power plant and an air volume power plant, the air volume is small even if the amount of solar radiation is small. When the weather conditions are large, it is possible to avoid a situation in which the amount of power generated by the entire power generation device 11 decreases.

1 Power generation system 15a, 15c 1st switch 11 Power generation device 15b 2nd switch 12 Array 21 Measuring device 13 Module 22 Power conditioner 14 String 23 system 15 Switch element 24 Load device

Claims (7)

A power generation system equipped with a power generation device that uses natural energy to generate power, a measuring device that measures the amount of power generated by the power generation device, and a power conditioner that converts the power generated by the power generation device from direct current to alternating current. There,
The maximum power generation amount of the power generation device exceeds the output capacity of the power conditioner,
A switch element capable of switching a part of the output destination of the electric power generated by the power generation device from the power conditioner to the load device is provided.
When the power generated by the power generation device measured by the measuring device exceeds the output capacity of the power conditioner , and the power generation amount of the output capacity of the power conditioner is maintained even after the switching. A power generation system characterized in that the output destination of a part of the generated electric power is switched when possible . The power generation device includes a photovoltaic power generation module.
The power generation system according to claim 1, wherein the load device includes a cooling device that cools at least one of the photovoltaic module and the power conditioner. The power generation device includes a photovoltaic power generation module.
The load device according to claim 1, wherein the load device includes a cooling device for cooling the photovoltaic power generation module, and is installed so as to cool the photovoltaic power generation module from a surface opposite to a light receiving surface. Power generation system. The power generation device is composed of a plurality of different types of power generation devices, and when the power generated by the plurality of power generation devices exceeds the output capacity of the power conditioner, the power generation device is generated in units of the type of the power generation device. The power generation system according to any one of claims 1 to 3, wherein the output destination of the electric power can be switched by the switch element. The power generation device is composed of an array in which a plurality of strings in which a plurality of the photovoltaic modules are connected in series are connected in parallel.
When the electric power generated by the power generation device exceeds the output capacity of the power conditioner, the output destination of the electric power generated by the same number of the photovoltaic power generation modules in each of the strings is sent to the load device. The power generation system according to claim 2 or 3 , wherein each string is provided with the switchable switch element. The power generation device is composed of an array in which a plurality of strings in which a plurality of the photovoltaic modules are connected in series are connected in parallel.
When the power generated by the power generation device exceeds the output capacity of the power conditioner, the switch elements capable of switching the output destination of the power generated by some of the strings to the load device are provided. The power generation system according to claim 2 or 3 , wherein the string is provided. Claims 1 to claim 1, wherein the amount of electric power output to the load device can be adjusted according to the amount of electric power generated by the power generation device exceeding the output capacity of the power conditioner. The power generation system according to any one of 6.

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