JP2008274769A - Power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generation system suitable for a middle-scale or a large-scale natural energy power generation, which generates electric power of high quality by using natural energy power generation. <P>SOLUTION: The power generation system comprises: a wind power generating device 2 separated from a system 1; and a pumped storage power generating device 3 connected to the system 1. The pumped storage power generating device 3 has: a storage pump 6 for drawing water of a lower pond 4 to an upper pond 5; and a generator 7 to be driven by the water fallen from the lower pond 5. The storage pump 6 is driven by using electricity generated by the wind power generating device 2, and electricity generated by the generator is supplied to the system 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power generation system. More specifically, the present invention relates to a power generation system using environmentally friendly natural energy.

  An example of power generation using natural energy is wind power generation. A wind power generator disclosed in Japanese Patent Laid-Open No. 11-299106 is shown in FIG. In this wind turbine generator, a power detector 102 that detects the power generated by the wind power generator 101, a storage battery 103 that stores the power generated by the wind power generator 101, and an average generated power based on a power detection signal from the power detector 102. An arithmetic unit 104 for obtaining a value is provided. When the generated power of the wind power generator 101 at the current time is higher than the average value, the generated power that exceeds the average value is converted into direct current by the converter 105 and stored in the storage battery 103. On the other hand, when the generated power of the wind power generator 101 at the present time is lower than the average value, the inverter 106 is operated to convert the power of the storage battery 103 into alternating current, and the power below the average value is supplied to the power line 107. is doing. By doing in this way, the fluctuation | variation of the voltage and frequency of wind power generation is suppressed. Reference numeral 108 in the figure is a controller that outputs the operation signals 111 and 112 to the converter 105 or the inverter 106 based on the power average value signal 109 from the arithmetic unit 104 and the power detection signal 110 from the power detector 102. .

JP-A-11-299106

  However, since the above-described wind power generation apparatus adjusts voltage and frequency fluctuations using the storage battery 103, it is particularly unsuitable for medium-scale or large-scale wind power generation. In addition, there is a certain limit to the adjustment of voltage and frequency fluctuations by the storage battery 103, and there is a possibility that the power quality may deteriorate as the scale of wind power generation increases. The above problems are not limited to wind power generation, but apply to all natural energy power generation that uses unstable natural energy such as tidal power generation, wave power generation, and solar power generation.

  An object of the present invention is to provide a power generation system suitable for medium-scale or large-scale natural energy power generation. Another object of the present invention is to provide a power generation system capable of generating power with excellent quality using unstable natural energy.

  In order to achieve this object, the power generation system according to claim 1 includes a natural energy power generation device separated from the grid and a pumped storage power generation device connected to the grid, and the pumped storage power generation device supplies water from the lower pond to the upper pond. A pump for pumping water and a generator driven by water dropped from the upper pond, and driving the pump for pumping using electricity generated by a natural energy generator, and a generator The electricity generated by is supplied to the system.

  For example, in power generation using unstable natural energy such as wind, tidal current, waves, etc., the rotation of the generator is not stable, and the output, voltage and frequency of the generated power fluctuate, so it is difficult to connect to the grid as it is It is. On the other hand, in pumped-storage power generation, power is generated by rotating the generator using the water in the upper pond, so even if the rotation of the pump for pumping the water in the lower pond fluctuates, the rotation of the generator Does not directly affect stability. In the present invention, unstable electricity produced by a power generation device using natural energy is used to drive a pump for pumping of a pumped storage power generation device, and therefore does not directly affect the rotation of the generator of the pumped storage power generation device. Also, by pumping the water from the lower pond and storing it in the upper pond, the electrical energy produced by the natural energy generator is converted into potential energy and stored.

  Further, in the power generation system according to the second aspect, the lower pond of the pumped-storage power generation is any one of the sea, the lake, and the river. Therefore, a natural thing can be used as a lower pond, and it becomes unnecessary to make a lower pond artificially.

  The power generation system according to claim 3 is for aquaculture of aquatic organisms in the upper pond of pumped storage power generation. Therefore, aquatic organisms can be cultivated together with power generation using the pumped-storage power generation facility. Needless to say, the water depth in the upper pond is maintained to such an extent that it is not difficult to cultivate aquatic organisms.

  According to a fourth aspect of the present invention, a water flow is generated in the upper pond by the discharge flow of the pump for pumping water. Therefore, a water stream can be used for aquaculture.

  Further, as in the power generation system according to claim 5, the natural energy power generation device may be at least one of a wind power generation device, a tidal power generation device, a wave power generation device, and a solar power generation device. Wind power uses wind, tidal power uses tide flow, wave power uses wave height fluctuations, and solar power uses sunlight. . Therefore, the output, voltage, etc. fluctuate and it is difficult to connect to the system as it is. In the present invention, since the electric power generated by these means is used to drive the pump for pumping of the pumped storage power generation device, it does not directly affect the rotation of the generator of the pumped storage power generation device connected to the system. In addition, any one of a wind power generator, a tidal power generator, a wave power generator, and a solar power generator may be used, but two or more may be used in combination.

  The power generation system according to claim 1, further comprising a natural energy power generation device separated from the grid and a pumped storage power generation device connected to the grid, the pumped storage power generation device pumping the water from the lower pond to the upper pond, And a generator driven by water dropped from the upper pond, which uses the electricity generated by the natural energy generator to drive the pump for pumping water, and the electricity generated by the generator Therefore, it is possible to supply high-quality power to the system using uneasy natural energy. In addition, since the upper pond of the pumped storage power generation is used as a so-called buffer for temporarily storing energy, it is suitable and suitable for larger-scale wind power generation, for example, compared to the case of using a storage battery or the like.

  Further, in the power generation system according to claim 2, since the lower pond of the pumped storage power generation is one of the sea, the lake, and the river, it is not necessary to make the lower pond artificially, and the construction cost is reduced accordingly, and the power generation cost is reduced. Can be reduced. In addition, when aquatic organisms are cultivated in the upper pond, uneaten food and manure can be released to the sea, lakes and rivers, making it easier to manage the upper pond as an aquaculture pond. The leftovers of food, manure, etc., become feeds for aquatic organisms that inhabit the sea, lakes, and rivers, and can support the growth of these aquatic organisms.

  Further, in the power generation system according to claim 3, since the aquatic organisms are cultivated in the upper pond of the pumped-storage power generation, the upper pond can be used as the culturing pond, and the cost is lower than when the power generation and the aquaculture are performed independently. Can be cheap. In addition, food left over from aquatic organisms during aquaculture, manure, etc. can be dropped together with the water in the upper pond into the lower pond, so that the water in the upper pond can be kept clean. In addition, the upper pond used for pumped-storage power generation is generally vast, and an aqua pond suitable for aquaculture of large aquatic organisms and aquatic organisms that need to swim around can be provided.

  Furthermore, in the power generation system according to the fourth aspect, since a water flow is generated in the upper pond by the discharge flow of the pump for pumping, aquatic organisms such as tuna that require a water flow for aquaculture can be cultured.

  Further, as in the power generation system according to claim 5, the natural energy power generation device may be at least one of a wind power generation device, a tidal power generation device, a wave power generation device, and a solar power generation device.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  1 and 2 show an example of an embodiment of the power generation system of the present invention. The power generation system includes a natural energy power generation device 2 separated from the system 1 and a pumped storage power generation device 3 connected to the system 1, and the pumped storage power generation device 3 pumps water from the lower pond 4 to the upper pond 5. 6 and a generator 7 driven by water dropped from the upper pond 5, the pump 6 for pumping water is driven using the electricity generated by the natural energy generator 2, and the generator The electricity generated by 7 is supplied to the system 1. In the present embodiment, for example, wind power is used as natural energy, and the natural energy power generation apparatus 2 is, for example, a wind power generation apparatus (hereinafter referred to as a wind power generation apparatus 2).

  The wind power generator 2 includes a wind power generator driven by the rotation of the propeller. A large number of wind power generators 2 are installed, for example, and constitute a wind power plant. Electricity generated by the generator of each wind power generator 2 is supplied to the pump 6 for pumping of the pumped-power generator 3.

  A pumped storage power generation device 3 constituting a pumped storage power plant is a seawater pumped storage power generation device that uses, for example, the sea as a lower pond 4. A pumping pipe 8 for taking seawater into the pump 6 for pumping water and a return pipe 9 for discharging the seawater rotated by the generator 7 to the sea as the lower pond 4 are installed on the bottom of the sea. The tip opening is disposed, for example, on the ocean floor in the open ocean. In addition, you may arrange | position the front-end | tip opening of each piping 8 and 9 in places other than the seabed of an open ocean, for example, the seabed of an inland ocean.

  In the upper pond 5 provided on land, a water flow is generated by the discharge flow of the pump 6 for pumping water. The plan view shape of the upper pond 5 is, for example, a circle, and aquatic organisms can continue to swim while turning around the upper pond 5. In the upper pond 5, the circular shape has a radius of at least about 100 m, for example. However, the scale of the upper pond 5 is not limited to this scale, and can be appropriately changed according to the scale of wind power generation or aquaculture described later. The upper pond 5 and the pump 6 for pumping water are connected to each other by an upward piping 10, and the upper pond 5 and the generator 7 are connected to each other by an downward piping 11. The upstream pipe 10 is connected to the discharge port 5 a of the upper pond 5, and the downstream pipe 11 is connected to the water outlet 5 b of the upper pond 5. An opening / closing door 12 is provided at the discharge port 5a, and an opening / closing door 13 is provided at the water discharge port 5b. When the pumped seawater is discharged from the discharge port 5a, the open / close door 12 is opened. Moreover, when the open / close door 13 is opened, seawater is discharged from the water outlet 5b. The upper pond 5 stores open sea water pumped by a pump 6 for pumping water. The upper pond 5 is provided with a sensor 14 for measuring the water depth.

  In this embodiment, one pump for pumping water 6 is provided, but a plurality of pumps may be provided. Similarly, in the present embodiment, one generator 7 is provided, but a plurality of generators may be provided.

  The upper pond 5 is an aquatic aquaculture pond. For example, relatively large fish can be cultivated in accordance with the scale of the upper pond 5. In this embodiment, for example, tuna culture is performed.

  Next, the operation of the power generation system will be described.

  When electricity is generated by the generator of the wind power generator 2, the pumped pump 6 of the pumped-storage power generator 3 is driven by the generated electricity, and fresh open ocean water is sucked from the tip opening of the pumping pipe 8 and rises. It is pumped from the pipe 10 to the upper pond 5. When the open / close door 13 of the water outlet 5b of the upper pond 5 is opened, the amount of seawater in the upper pond 5 corresponding to the opening degree falls from the water outlet 5b into the descending pipe 11 and drives the generator 7. Then, the return pipe 9 returns to the open ocean. Electricity generated by the generator 7 is supplied to the system 1. The open / close doors 12 and 13 may be opened and closed using an actuator such as an electric motor or a hydraulic cylinder, or may be manually opened and closed.

  In general wind power generation, the output, voltage, and frequency of power generation vary depending on the wind direction, wind speed, and the like. However, in the power generation system of the present invention, the unstable electricity generated by the wind power generator 2 does not directly affect the rotation of the generator 7 connected to the grid 1. For this reason, the pumped-storage power generator 3 can supply stable and high-quality electricity to the system 1.

  Seawater pumped to the upper pond 5 by the pump 6 for pumping water is discharged from the discharge port 5a. For this reason, a water flow is generated in the upper pond 5. Since the discharge port 5a is formed on the peripheral wall 5c of the upper pond 5 in a direction along the wall surface, a water flow circulating in the upper pond 5 is formed as shown by an arrow in FIG. For this reason, it is suitable for aquatic organisms that require a flow of seawater for aquaculture, such as tuna. The upper pond 5 is, for example, a large-scale one, and is suitable for culturing large fish such as tuna and fish having habit of swimming around in a water stream. FIG. 2 shows a state in which both the opening and closing doors 12 and 13 are open.

  Uneaten food, manure, etc. in the upper pond 5 are discharged to the open ocean together with the seawater in the upper pond 5. Also, fresh seawater is pumped from the open ocean into the upper pond 5 by driving the pump 6 for pumping water. That is, the seawater in the upper pond 5 is replaced, and water quality management of the upper pond 5 as an aquaculture pond becomes easy. In addition, uneaten food and manure discharged from the open ocean serve as aquatic organisms that live in the open ocean. Furthermore, by discharging the seawater in the upper pond 5 to the ocean floor of the open ocean, for example, garbage or sludge accumulated on the ocean floor of the open ocean can be flowed, and the ocean floor can be cleaned.

  The depth of the seawater stored in the upper pond 5 is constantly monitored by the sensor 14. When the sensor 14 detects that the depth of the seawater in the upper pond 5 has become shallow enough to cause a problem in aquaculture, the open / close door 13 of the water outlet 5b is closed. For this reason, it is possible to prevent the seawater in the upper pond 5 from becoming too shallow, and it is possible to continue aquaculture of aquatic organisms.

  Also, for example, when there is not enough wind for a long period of several days, or when wind power cannot be generated due to failure, etc., water is pumped by electricity supplied from the grid 1 or electricity generated using an emergency generator. The pump 6 may be driven to draw seawater from the sea.

  Moreover, the pumped-storage power generation may be performed all the time as long as it does not interfere with the aquaculture, or for example, the pumped-storage power generation may be performed when the power demand increases.

  Wind power generation uses natural wind to generate electricity, so electricity is generated regardless of power demand. On the other hand, a power plant basically needs to generate power in accordance with power demand. In the power generation system of the present invention, by combining wind power generation and pumped-storage power generation, electric power resulting from wind power generation can be supplied to the grid 1 in accordance with power demand.

  In wind power generation, since natural wind is used, output, voltage, and frequency fluctuate, and it is difficult to obtain high-quality power directly. If such electric power is supplied to the grid 1 as it is, the quality of the entire power of the grid 1 is deteriorated. In particular, areas suitable for wind power generation are often areas with low power demand, and the proportion of wind power generation in the total power supplied to the area is relatively large, so the deterioration in power quality is significant. . For this reason, the electric power by wind power generation is supplied to the grid | system 1 through accumulation | storage by a battery etc. Accumulation with NaS batteries or the like is a solution for small wind power generation sites, but is not suitable for large wind power generation sites.

  It is expected that large-scale wind power plants will be established in areas suitable for wind power generation, and there is a demand for the realization of energy storage facilities suitable for large-scale wind power plants. In the power generation system of the present invention, the upper pond 5 is an energy storage facility, and the energy storage facility is large-scale. For this reason, a power generation system suitable for a large-scale wind power plant can be realized.

  Advantages of using the upper pond 5 as an aquaculture pond are that fresh seawater can always be used for aquaculture, that the water temperature in the upper pond 5 can be generally maintained at the temperature of the seawater, The aquatic organism manure is not stored and can be released to the open ocean, and the released food and aquatic organism manure becomes the feed of fish living in the open ocean. Further, the upper pond 5 is provided on the land, so that the aquatic organisms being cultivated do not escape to the sea and the nets used for culturing are not washed away. Furthermore, because the upper pond 5 of the pumped-storage power generation is used, it is easy to secure a large-scale aquaculture pond, and the wind power generator supplies the energy necessary for the replacement of the aquaculture pond water, countermeasures against water contamination, water temperature adjustment, etc. 2 can be obtained without consuming other energy.

The characteristics of the power generation system from the viewpoint of aquatic aquaculture are as follows.
(A) Since the culture pond can be made large-scale, large-scale fish (large-scale fish exceeding 10 kg) can be cultured. Of course, it is also suitable for aquaculture of small fish and seaweed shellfish. That is, since the upper pond 5 as an aquaculture pond can be considered as an artificial small sea or lake, all marine organisms and lake organisms can be cultivated. For example, marine fish: tuna, amberjack, yellowtail, thailand, pufferfish, sea bass, gre, etc. , Clams, red sea bream, etc., seaweed: kombu, seaweed, arame, sea bream, etc. Other: Shrimp, crab friends, etc. are exemplified as crustaceans, but not limited to these. In addition, the seaweed contains what becomes the food of shellfish.
(B) A mechanism to cultivate fish species that cannot be balanced due to a drop in production in nature in response to demand represented by tuna is completed.
(C) A large aquarium and a water flow are necessary for the cultivation of fish species that cannot live unless they keep swimming at all times, particularly tuna, and the present invention is suitable.
(D) In aquaculture of small fish and those that are easily washed away by water, it is possible to cultivate sufficiently by installing a net, for example, in the center of the upper pond 5 as in the case of aquaculture in the open ocean. FIG. 2 shows an installation example of the net 15 with a two-dot chain line. For aquaculture in the net 15, for example, small aquatic organisms and aquatic organisms that are easily washed away by water currents are suitable. As for the size of fish to be cultivated, for example, a fish of the size of Mochaco to Sardine is suitable for aquaculture within the net 15, and a fish of a size of Inada to yellowtail is suitable for aquaculture outside the net 15. It is thought that there is. Examples of aquatic organisms that are likely to be washed away by water currents include fish with little movement such as pufferfish and flounder, seaweeds, shellfish that feed on seaweeds, etc., and these are also suitable for aquaculture in the net 15. ing.
(E) It is possible to simultaneously cultivate various aquatic organisms in the upper pond 5.
(F) Wind power is used to pump water into the upper pond 5 and to generate water flow in the upper pond 5 and to operate differently from normal pumped-storage power generation. It is possible to pump the fresh seawater into the upper pond 5 by driving the water pump 6.

In addition, the following are the characteristics of the operation of the seawater pumped storage power plant.
(A) Unlike a normal pumped-storage power plant, the conditions for pumping water are significantly different from those of a system that pumps water intensively and drops water for intensive power generation. That is, since all the electric power generated by the wind power generation is used for pumping water, it is possible to pump water as long as the wind blows.
(B) For an electric power company, it is possible to generate electricity by using the company's wishes only with the amount of water stored in the upper pond 5 and a rough wind condition prediction (whether strong winds will blow tomorrow, etc.).
(C) As a result, a power generation system that can make full use of the power generated by wind power generation, which has been shunned as far as quality is inferior, without predicting the amount of power generation that changes from moment to moment.
(D) By cultivating aquatic organisms with high market value, the burden associated with the construction of the facility is reduced, and the added value is increased to produce a synergistic effect.
(E) However, as with conventional pumped-storage power generation dams, water cannot be dropped to the limit, so the minimum water depth is determined by the balance with the scale of farming (number of animals per unit seawater volume, body weight, fish species). It is necessary.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above description, the sea is used as the lower basin 4 of the pumped-storage power generation apparatus 3, but the present invention is not necessarily limited to the sea, and lakes, ponds, rivers, and the like may be used.

  Moreover, it is not always necessary to use a natural sea or the like as the lower pond 4, and an artificially made pond or the like may be used.

  In the above description, the aquatic organisms are cultured using the upper pond 5 of the pumped storage power generation device 3, but the aquaculture may not be performed.

  Further, in the above description, the water flow necessary for aquaculture is generated in the upper pond 5 by the discharge flow of the pump 6 for pumping of the pumped-storage power generator 3, but the intentional water flow is not generated in this way. May be.

  Further, in the above description, for example, wind power is used as natural energy. That is, the natural energy power generation apparatus 2 is, for example, a wind power generation apparatus, but is not limited thereto. For example, tidal power, wave power, solar energy, etc. may be used as natural energy, that is, tidal power generators using the power of flowing tides, wave power generators using the power of rising and falling waves, solar energy It may be a solar power generation device or the like using Of course, other power generators using natural energy may be used.

  For example, in the case of a tidal power generation device, it is conceivable to generate electricity by turning a propeller according to the flow of the tide, and to drive the pump 6 for pumping with that power. Further, in the case of a wave power generation device, it is considered that compressed air is generated by changing the height of the wave, the generator is rotated by this compressed air to generate electric power, and the pump 6 for pumping water is driven by the electric power. It is done. In the case of a solar power generation device, it is conceivable to generate power using a solar cell and to drive the pump 6 for pumping with the power.

A trial calculation was performed on the scale of the power generation system of the present invention.
(1) Operation method of wind power plant and seawater pumped-storage power plant (a) The power of the wind power generator 2 is all in the lower pond 4 so that the electricity generated by the wind power generator 2 does not disturb the power of the grid 1 Dedicated to pumping seawater into the upper pond 5.
(B) The pump 6 for pumping and the generator (power generating pump) 7 of the pumped-storage power generator 3 are not shared, and are separately installed.
(C) Half of the seawater pumped into the upper pond 5 was dropped at the same time as being pumped and used for power generation by the generator 7.
(D) The other half of the seawater pumped up in the upper pond 5 was dropped in one day and used for power generation by the generator 7.

(2) Assumption of wind power plant (example of actual power plant)
(A) Soyamisaki Wind Farm (57,000kW, altitude 100-170m)
(B) Iwaya Wind Farm, Shiriko Wind Farm (32,500kW, 19,250kW, altitude 250-320m)
All the power plants were assumed to have a facility utilization rate of 20%. In addition, each power plant assumed the amount of power generation per day to be 1% of the maximum annual power generation. Table 1 shows the results of the trial calculation.

(3) Facility scale of pumped storage power plant (assuming aquaculture)
(A) Of the maximum daily power generation of wind power generation, half was pumped up and used for pumped-storage power generation, and the other half was fully stored, so that it could be used for power generation in a maximum of 5 hours according to demand.
(B) Of the seawater stored in the upper pond 5, one having a depth of up to 2/3 was used for power generation, and the remaining 1/3 was left as the minimum amount of water for aquaculture.
(C) The efficiency of the pump for pumping water 6 and the generator 7 was assumed to be 85%, respectively.
(D) The shape of the upper pond 5 is a cylindrical shape (circumference> water depth) for easy calculation.

  Table 2 shows the results of the trial calculation. For comparison, data on the Okinawa Seawater Pumped Storage Power Plant is also shown.

(4) Possibility of realization

  If the pumping pump 6 and the generator 7 have an efficiency of 85%, the overall efficiency is 85% × 85% = 72%. That is, it was confirmed that 72% of the wind power generation amount (excluding the loss at the time of pumping and power generation) is the power generation amount of high-quality power. As a result, it was found that it is possible to realize a power generation system.

Trial calculations were carried out for aquaculture in the upper pond 5.
(I) First, the merit of aquaculture of aquatic organisms in the upper pond 5 was examined. The results are shown below.
(A) Generally, aquaculture of aquatic organisms on land is difficult to cultivate large fish because of the relationship with the scale of the aquarium. However, in the present invention, the upper pond 5 is large, so that large fish can be cultivated.
(B) Among aquatic organisms, those that cannot survive unless swimming at high speed at all times are severely damaged by collision in a small aquarium. However, in the present invention, since a large-scale upper pond 5 is used and a water flow in a certain direction can be created when water is pumped into the upper pond 5, favorable conditions are established by aquaculture.
(C) As long as the wind blows, open sea water containing a large amount of fresh oxygen and organic matter is supplied into the upper pond 5, and the sea water in the upper pond 5 is almost replaced in one day.
(D) As long as the wind blows, the ocean water in the upper pond 5 is pumped into the upper pond 5, so that the water temperature in the upper pond 5 can be maintained substantially at the water temperature in the outer ocean even in a region where the temperature is low.
(E) The food sown in the aquarium and the generated manure will be released to the open ocean, but unlike the bay farming, it will be purified by feeding it into marine products that live in the open ocean. Also useful for.
(F) The upper pond 5 is a pooled pond with a diameter of more than 100 meters, but the center seen from above has little flow, so fry and seaweed, as well as shellfish such as tuna and abalone It will be a suitable environment.

(II) Tuna is evaluated as an example of a large migratory fish that is considered to be the greatest merit.
(1) The following items are known as necessary conditions for tuna farming.
• A minimum of 4m ³ / animal is required to grow tuna without stress.
-Tuna migrate at an average speed of 30 km / h.
・ About 1 kg / animal / day is required.
-Tuna weighing 30 kg to 40 kg can be sold at 4000 to 5000 yen / kg.

(2) Based on the above conditions, a trial calculation was made for tuna farming in the upper pond of the Soya Cape Wind Farm Class and the upper pond of the Iwaya Wind Farm / Shiori Wind Farm Class.

First, the number of animals that can be cultured was estimated. Trial calculations indicate that one third of the water depth of the upper pond has been secured. Table 2 shows the volume of the upper pond of each wind farm. In the Soyamisaki Wind Farm class, if the upper pond volume is 1647,000 m ³ , the water depth is 1/3, and the minimum required space is 4 m ³ / animal, then 1647000 ÷ 3 ÷ 4≈137,000. In the Iwaya / Shiori Wind Farm class, assuming that the upper pond volume is 648,000 m ³ , the water depth is 1/3, and the minimum required space is 4 m ³ / animal, it is 648000 ÷ 3 ÷ 4 = 54,000. In other words, 137,000 can be cultivated in the upper pond of the Soya Cape Wind Farm Class, and 54,000 can be cultivated in the upper pond of the Iwaya / Shiori Wind Farm Class.

  Next, a trial calculation was performed on the required amount of food. Since the necessary amount of food is 1 kg (= 0.001 t) / animal / day, 137,000 × 0.001 = 137 t in the Soya Cape Wind Farm Class. In the Iwaya / Shiori Wind Farm class, 54000 × 0.001 = 54t. That is, the necessary bait is 137 t / day in the Soya Misaki wind farm class, and 54 t / day in the buttocks wind farm class.

  Next, the earnings were estimated. Assuming that the farming period was two and a half years, it sold for 1580,000 yen per animal. Here, 1580,000 yen is a value per animal when 35 kg of tuna is sold at 4500 yen / kg. In the Soyamisaki Wind Farm Class, 137,000 / 2.5 years x 158,000 yen = 8.6 billion yen / year. In the Iwaya / Shiragi Wind Farm class, 54,000 animals / 2.5 years x 158,000 yen = 3.4 billion yen / year.

  The construction cost of a pumped storage power plant for Soyamisaki Wind Farm Class and Iwaya / Shiori Wind Farm Class is, for example, about 500,000 yen / kW, and the total cost is about 30 to 35 billion yen. Since these facilities usually have about 50 years, the annual depreciation will be about 600 million to 700 million yen. Here, according to the above calculation, sales are from 3.4 billion yen to 8.6 billion yen per year, so it is considered profitable even if necessary expenses (feeding expenses, personnel expenses, transportation charges) are included. On the other hand, the facility cost of wind power generation can be depreciated by selling the generated electricity to an electric power company, so there is no extra cost if it is suitable for normal wind power generation. In addition, since the electric power company can be operated as a normal stable power generation facility, the selling price is higher than the purchase price from the wind power generation company, and there is an income from the operation. In addition, since the aquaculture farmer can secure a farm that does not affect stable weather, even if the upper pond usage fee is paid, the income increases as much as there is less risk. In other words, it was found that a system that would be financially satisfactory for companies that produce wind power, companies that sell electricity using pumped water, and companies that produce seafood was completed.

It is a conceptual diagram which shows an example of embodiment of the electric power generation system of this invention. It is a conceptual diagram which shows the upper pond of the same electric power generation system. It is a conceptual diagram of the conventional wind power generator.

Explanation of symbols

1 system 2 wind power generator (natural energy generator)
3 Pumped-storage system 4 Lower pond 5 Upper pond 6 Pump for pumping 7 Generator

Claims (5)

  A natural energy generator separated from the grid, and a pumped-storage generator connected to the grid, the pumped-storage generator dropped from the upper pond, and a pump for pumping water from the lower pond to the upper pond A generator driven by water, driving the pump for pumping using electricity generated by the natural energy generator, and supplying electricity generated by the generator to the system A power generation system characterized by   The power generation system according to claim 1, wherein the lower pond of the pumped storage power generation device is one of a sea, a lake, and a river.   The power generation system according to claim 1 or 2, wherein aquatic organisms are cultivated in an upper pond of the pumped storage power generation device.   The power generation system according to claim 3, wherein a water flow is generated in the upper pond by a discharge flow of the pump for pumping water.   The natural energy power generation apparatus is at least one of a wind power generation apparatus, a tidal power generation apparatus, a wave power generation apparatus, and a solar power generation apparatus. Power generation system described in one.

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