WO2011036523A1 - 系統連系形給電システム - Google Patents
系統連系形給電システム Download PDFInfo
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- WO2011036523A1 WO2011036523A1 PCT/IB2010/002112 IB2010002112W WO2011036523A1 WO 2011036523 A1 WO2011036523 A1 WO 2011036523A1 IB 2010002112 W IB2010002112 W IB 2010002112W WO 2011036523 A1 WO2011036523 A1 WO 2011036523A1
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- Prior art keywords
- power
- demand
- grid
- load
- predicted
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Definitions
- the present invention relates to a grid-connected power feeding system that feeds power by connecting a power generation device that uses natural energy, such as solar power generation or wind power generation, to a commercial power system.
- a photovoltaic power generator and a commercial power system are connected to each other, and a power storage device that can be charged from both sides is installed, so that the electricity bill is relatively low (low) at night At midnight, the power storage device is charged with the power supplied from the commercial power system, and the electricity discharged from the power storage device is supplied to the load when the amount of power generated by the solar power generation device is insufficient in the daytime when the electricity bill is relatively high.
- a grid-connected photovoltaic power generation system is provided (see Patent Document 1 or Patent Document 2).
- the amount of power generated by the photovoltaic power generation device is small, such as when it is cloudy or rainy, and the power stored in the power storage device is supplied to the load when it does not meet the load power demand.
- the cost (electricity charge) required for power supply can be reduced.
- the above conventional power storage device needs to convert AC power fed from the commercial power system into DC power and store it, and also to convert from DC power to AC power again when supplying it to the load.
- a power loss that combines the power loss during conversion and the power loss during DC-AC conversion occurs. For this reason, in sunny weather when the solar power generator can generate enough power, it is more energy efficient to supply power directly from the commercial power system than to make up for the slight shortage with the power stored in the storage device charged the night before. In some cases, electricity charges may be reduced.
- Patent Document 1 Japanese Laid-Open Patent Publication No. 10-2 0 1 1 2 9
- Patent Document 2 Japanese Patent Laid-Open No. 2 0 0 2-3 6 9 4 0 6
- the present invention has been made in view of the above circumstances, and provides a grid-connected power supply system that can achieve power saving (energy saving) while reducing power cost (electricity charge).
- a grid-connected power supply system generates power using natural energy and is connected to the commercial power system in parallel with the grid-connected power generator, and is fed from the commercial power system
- a power storage device that converts AC power into DC power, charges and discharges, converts AC power into AC power and supplies power to the load
- a control device that controls charging / discharging of the power storage device, the control device Predicts the power generation amount of the power generation device and the load power demand the next day, and if the predicted value of the power generation is lower than the predicted power demand value, the electricity storage cost of the commercial power grid is stored at a relatively low time. If the power generation device is charged and the predicted value of power generation does not fall below the predicted value of power demand, the power storage device is not charged during the time period.
- the electricity cost (electricity fee) is charged by charging the power storage device in a time when the electricity rate of the commercial power system is relatively low.
- the power loss associated with charging / discharging the power storage device by not charging the power storage device during the time period Eliminating power consumption can be achieved.
- control device may be charged in a time zone when the electricity charge of the commercial power system is relatively low and may discharge the power storage device in a time zone where the electricity charge is relatively high.
- the power cost (electricity fee) is reduced by discharging the power storage device in a time zone in which the electricity rate is relatively high in preference to a time zone in which the electricity rate of the commercial power system is relatively low. Can be reduced.
- the grid-connected power supply system further includes an operation input receiving unit that receives an operation input related to the power demand of the load, and the control device loads based on the operation input received by the operation input receiving unit.
- the electricity demand may be predicted.
- the control device predicts the power demand of the load, so it can accurately predict the power demand of the load in a different situation.
- control device compares the amount of power that can be discharged by the power storage device with the predicted value of the power demand of the load when discharging the power storage device, and the amount of power that can be discharged falls below the power demand of the load within a predetermined time. May be notified when it is predicted.
- the user is informed that the power demand of the load cannot be covered by the discharge from the power storage device after a few hours, and the user is conscious of suppressing the power consumption of the load. Can be made.
- the control device has a function of controlling operations of a plurality of electric devices as loads, and is determined in advance when it is predicted that the amount of power that can be discharged falls below the power demand of the load within a predetermined time. It is also possible to control the operation so that the power consumption decreases sequentially from the lower priority electrical equipment.
- control device creates a power demand schedule for a load so that the predicted power generation amount does not fall below the predicted power demand value when the predicted power generation value is lower than the predicted power demand value. It may be presented to the user.
- the user's awareness of power saving can be raised.
- the invention's effect According to the present invention, it is possible to save electric power (energy saving) while reducing electric power cost (electricity charge).
- FIG. 1 is a system configuration diagram showing an embodiment of the present invention.
- FIG. 2 is a flowchart for explaining the operation of the control device according to the above.
- FIG. 3 is an example of creating a power demand schedule for the control device in the same as above.
- the power generation device in the grid-connected power supply system according to the present invention is not limited to the solar power generation device, and may be another power generation device using natural energy such as a wind power generation device.
- the place where the grid-connected power supply system of the present embodiment is installed is not limited to a house, and may be an apartment house or an office.
- the grid-connected power feeding system of this embodiment includes a grid-connected photovoltaic power generator 1 connected in parallel with the commercial power system AC, and AC power fed from the commercial power system AC.
- a power storage device 2 that supplies the stored AC power to a load 6
- a control device 3 that controls charging / discharging of the power storage device 2
- a display operation device 4 are provided.
- the solar battery array (not shown) of the solar power generation device 1 and the power storage device 2 are installed outside the house, but the other power conditioners (not shown) and the control device 3 of the solar power generation device 1 are installed.
- the display operation device 4 and the like are installed in the house.
- the solar power generation device 1 is well-known and includes a solar cell array composed of a large number of solar cells, a power conditioner equipped with an inverter that converts DC power output from the solar cell array into AC power, and the like. Has been. Note that the photovoltaic power generation device 1 can also reversely flow (sell power) the surplus generated power to the commercial power system AC.
- the storage device 2 is a storage battery 20 such as a lead storage battery, and AC power supplied from the commercial power system AC and the solar power generation device 1 is converted into DC power to charge the storage battery 20 and discharge from the storage battery 20.
- a DC / AC bidirectional power conversion unit 21 for converting DC power to AC power. Note that the DC / AC bidirectional power conversion unit 21 stops operation and charge operation (from AC power to DC power) according to a control signal transmitted from the control device 3 via the signal line L s as described later. of Conversion) and discharge operation (conversion from DC power to AC power) are alternatively switched.
- losses occur during power conversion from AC to DC and during power conversion from DC to AC, respectively. However, less power is supplied to the load 6 during discharge.
- Distribution board 5 is a main circuit breaker (not shown) in which the primary side is connected to the commercial power system AC and the secondary side is connected to the photovoltaic power generator 1 (the output of the conditioner) and the power storage device 2 in parallel. And a plurality of branch breakers (not shown) branched and connected to the secondary side of the main breaker, and each load from the commercial power system AC, the photovoltaic power generator 1, and the power storage device 2 through the branch breakers. 6 is supplied with AC power.
- the load 6 is an electric device such as an air conditioner TV receiver, an electromagnetic cooker, or a refrigerator. However, as will be described later, among the plurality of loads 6, there are mixed loads 6 that can be controlled by a control signal transmitted from the control device 3 via the signal line Ls.
- the control device 3 includes a control unit 30 having a microcomputer as a main component, and an electrically rewritable semiconductor memory (for example, a flash memory), and a program executed by the microcomputer of the control unit 30 And a storage unit 31 for storing various data and the like, a control signal transmission unit 3 2 for transmitting a control signal to the power storage device 2 and the load 6 via the signal line L s, and a telephone line, a CATV coaxial line, or an optical fiber And a network communication unit 33 for performing network communication with the Internet via the communication line Lx.
- a control unit 30 having a microcomputer as a main component, and an electrically rewritable semiconductor memory (for example, a flash memory), and a program executed by the microcomputer of the control unit 30
- a storage unit 31 for storing various data and the like
- a control signal transmission unit 3 2 for transmitting a control signal to the power storage device 2 and the load 6 via the signal line L s
- a telephone line a CA
- the control unit 30 operates according to the control signal transmitted from the control signal transmission unit 3 2 via the signal line L s, and operates (stops, charges) the DC Z AC bidirectional power conversion unit 21 included in the power storage device 2. , Discharge) and the operation of some controllable loads 6.
- the control signal transmission unit 3 2 is not limited to the one that transmits the control signal via the dedicated signal line L s.
- the control signal transmission unit 3 2 is controlled by power line carrier communication via the power supply line wired in the house. It may be a device that transmits a signal, or a device that transmits a control signal using radio waves as a communication medium, such as a low-power radio station.
- the network communication unit 33 is a communication device (and AN controller) that uses a wired LAN (such as 100BASE-TX) that uses a twisted pair cable (LAN cable) as the communication medium (communication path L x), as well as a telephone line and optical network. It has modems (ADSL modem, ONU, cable modem, etc.) to connect to the Internet via fiber line or CATV line and perform data communication with various web sites. Note that a unique IP address (global IP address) is assigned to the modem in order to perform data communication with the web site via the Internet 7.
- a unique IP address global IP address
- the control unit 30 predicts the power generation amount of the photovoltaic power generator 1 the next day and the power consumed by the load 6 (electric power demand) the next day.
- a website providing weather information such as a weather forecast (for example, the homepage of the Meteorological Agency or local regional meteorological observatory) is available via the Internet.
- weather information such as a weather forecast (for example, the homepage of the Meteorological Agency or local regional meteorological observatory) is available via the Internet.
- forecast power demand for the next day There is a method of forecasting based on past power consumption results and historical information such as weather.
- the display operation device 4 includes a control unit 40 including a microcomputer as a main component, a display device such as a liquid crystal display or an organic EL display, and visual information such as characters, figures and symbols by driving the display device.
- the display unit 4 1 to present (display) and the touch panel combined with the display device.
- the user (resident) touches the touch panel to accept various operation inputs and pass them to the control unit 40
- Bucket communication is performed between the accepting unit 4 2 and the control device 3 via the communication channel L x (LAN cable) from the common communication device (LAN controller) with the network communication unit 3 3 of the control device 3 Network communication unit 4 3.
- each of the control device 3 and the display operation device 4 is assigned a unique IP address (private IP address).
- commercial electricity system AC has electricity charges set according to the time of day. For example, early morning hours from 7:00 am to 10:00 am and evenings from 5:00 pm to 11:00 pm The time zone is set to the same price, the daytime time zone from 10:00 am to 5:00 pm is set to the highest rate, and the nighttime time zone from 1 pm to 1 am the next morning is the lowest price. Is set. In other words, if the amount of power supplied from the commercial power system AC is the same, the electricity charge in the midnight hours is the lowest (cheap), and the electricity charge in the daytime hours is the highest.
- the control unit 30 will receive the maximum expected temperature of the next day obtained from the web site by the network communication unit 33.
- the power generation amount P 1 of the next day of the photovoltaic power generation device 1 is predicted based on the predicted solar radiation amount (Step S 1), and the power demand P 2 of the load 6 of the next day is predicted based on the past power demand performance etc. (Step S 2), the predicted power generation amount P 1 of the next day is compared with the power demand P 2 of the next day (Step S 3).
- step S 4 When power generation amount P 1 of the following day is less than the power demand P 2 of the next day, the control unit 30 from the commercial power grid AC during the time period when electricity charges are the cheapest (11:00 pm to 7:00 am the next morning)
- the power storage device 2 (DC / AC bidirectional power converter 2 1) is controlled so as to store the supplied AC power (step S 4).
- the control unit 30 does not perform control for storing power in the power storage device 2 at midnight (step S 5).
- the control unit 30 of the control device 3 predicts the power generation amount of the next day of the solar power generation device 1 and the power demand of the next day of the load 6, and compares the power generation amount with the power demand.
- the predicted power generation value P 1 is lower than the predicted power demand value P 2
- the electricity is charged by charging the power storage device 2 during the time when the electricity rate of the commercial power system AC is relatively low (midnight).
- the predicted value P1 of power generation does not fall below the predicted value P2 of power demand, the power storage device 2 is not charged during the time period. It is possible to save power by eliminating the power loss associated with charging and discharging to 2.
- the storage unit 3 1 of the control device 3 stores information such as the past power demand record
- the control unit 30 stores the past power demand record stored in the storage unit 31.
- the next day's power demand is forecasted based on the situation, so the situation is different from usual, for example, the demand for power is usually reduced to stay away, or the demand for power is usually increased because many people gather.
- the situation increases, there is a risk that the predicted value P2 of power demand will greatly differ from the actual power demand.
- the operation input receiving unit 4 2 of the display / operation device 4 receives the operation input related to the power demand of the load 6, for example, the operation input instructing increase / decrease of the irregular power demand as described above.
- the content of the instruction is transmitted from the control unit 40 of the display operation device 4 to the control unit 30 of the control device 3 through the network communication unit 43.
- the control unit 30 of the control device 3 determines the power demand of the load 6 based on the instruction received from the display operation device 4, that is, the information that the power demand for the next day is larger (or less) than usual. Therefore, it is possible to more accurately predict the power demand of load 6 under different circumstances.
- the control unit 30 of the control device 3 is in a time zone when the electricity rate of the commercial power system AC is relatively low. (E.g., early morning and night time), and the electricity cost (electricity rate) is reduced by discharging the power storage device 3 during the time when the electricity rate is relatively high the next day (for example, during the daytime). We try to reduce it.
- the DC / AC bidirectional power conversion unit 21 of the power storage device 2 detects the remaining capacity (dischargeable power amount) of the storage battery 20 based on the battery voltage of the storage battery 20 and the like, and controls the control device 3.
- the control unit 30 of the control device 3 compares the amount of power that can be discharged by the power storage device 2 when the power storage device 2 is discharged (remaining capacity of the storage battery 20) with the predicted value P2 of the power demand of the load 6.
- a message to that effect is displayed on the display unit 4 1 of the display operation device 4, for example, Then, after a few hours, it is possible to notify the user (resident) by displaying a message such that power supply from the power storage device 2 becomes impossible, and to make the user aware that the power consumption of the load 6 is suppressed. In this embodiment, the notification is made only visually.
- the display operation device 4 is equipped with a sound power, and a sound message is sounded from the speaker so that an audible notification is performed together with the visual notification. It doesn't matter.
- the control unit 30 of the control device 3 determines the predetermined priority order. The operation is controlled so that the power consumption gradually decreases from the low load 6 (electric equipment). For example, if the temperature setting of the air conditioner is changed or the air conditioner is stopped, the power consumption of the electric equipment is forcibly reduced. The time during which power can be supplied from the power storage device 2 can be extended.
- the control unit 30 of the control device 3 determines that the predicted power generation value P1 is lower than the predicted power demand value P2.
- the power demand schedule (schedule) for the load 6 is created and presented to the user so that the power generation forecast value P1 does not fall below the power demand forecast value P2. For example, if the power demand schedule (schedule) for a normal day (1 ⁇ ) is as shown by the solid line A in Fig. 3, the controller 30 will schedule the power demand (schedule as shown by the broken line B in Fig. 3 ) And a web content for displaying the daily power demand schedule and the newly created power demand schedule are created and distributed to the display operation device 4.
- the display operation device 4 uses the web browser function of the control unit 40 to reproduce the web content distributed from the control device 3, and displays the power demand schedule (solid line A and Display broken line B). In this way, it is possible to raise awareness of power saving (energy saving) for users who see the power demand schedule displayed on the display unit 41.
- the time information for charging / discharging the power storage device can be found by using, for example, a known clock IC.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Control Of Electrical Variables (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10818472.2A EP2485359B1 (en) | 2009-09-28 | 2010-08-30 | Grid-connected power supply system |
US13/498,462 US9520623B2 (en) | 2009-09-28 | 2010-08-30 | Grid-connected power supply system |
CN201080043158.7A CN102598458B (zh) | 2009-09-28 | 2010-08-30 | 并网型供电系统 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-223351 | 2009-09-28 | ||
JP2009223351A JP5685715B2 (ja) | 2009-09-28 | 2009-09-28 | 系統連系形給電システム |
Publications (1)
Publication Number | Publication Date |
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WO2011036523A1 true WO2011036523A1 (ja) | 2011-03-31 |
Family
ID=43795449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2010/002112 WO2011036523A1 (ja) | 2009-09-28 | 2010-08-30 | 系統連系形給電システム |
Country Status (5)
Country | Link |
---|---|
US (1) | US9520623B2 (ja) |
EP (1) | EP2485359B1 (ja) |
JP (1) | JP5685715B2 (ja) |
CN (1) | CN102598458B (ja) |
WO (1) | WO2011036523A1 (ja) |
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EP2808969A4 (en) * | 2012-01-23 | 2015-10-21 | Kyocera Corp | GENERATED ENERGY QUANTITY ESTIMATING APPARATUS, POWER GENERATION QUANTITY ESTIMATING CORRECTION METHOD, AND POWER GENERATING SYSTEM FROM NATURAL POWER SOURCE |
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Also Published As
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EP2485359A4 (en) | 2017-05-17 |
CN102598458B (zh) | 2015-11-25 |
US9520623B2 (en) | 2016-12-13 |
EP2485359B1 (en) | 2020-09-30 |
JP5685715B2 (ja) | 2015-03-18 |
US20120181864A1 (en) | 2012-07-19 |
CN102598458A (zh) | 2012-07-18 |
EP2485359A1 (en) | 2012-08-08 |
JP2011072166A (ja) | 2011-04-07 |
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