WO2016208319A1 - 蓄電池制御装置、蓄電池充放電システム、太陽光発電システム、および蓄電池制御方法 - Google Patents
蓄電池制御装置、蓄電池充放電システム、太陽光発電システム、および蓄電池制御方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 32
- 238000003860 storage Methods 0.000 claims abstract description 261
- 238000010248 power generation Methods 0.000 claims abstract description 141
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
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Classifications
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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
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
-
- 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
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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
-
- 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
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
-
- 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
- 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
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Definitions
- the present invention relates to a storage battery control device that controls charging / discharging of a storage battery, a storage battery charge / discharge system, a solar power generation system, and a storage battery control method.
- a second charging control step of controlling charging of the storage battery by the control means so that the charging up to is completed for example, see Patent Document 1).
- An object of the present invention is to provide a storage battery control device, a storage battery charge / discharge system, a solar power generation system, and a storage battery control method capable of controlling the state of charge of the storage battery and improving economic efficiency.
- the storage battery control device includes a load power prediction device that predicts load power required for a load, a PV power prediction device that predicts power generated by solar power generation, and a prediction that starts at a predetermined time.
- the predicted charge amount is calculated by subtracting the load power amount that is the sum of the load power of the predicted section from the power generation amount that is the sum of the generated power of the section, the predicted charge amount is charged in the predicted section when the predicted charge amount is positive.
- a system controller that controls the state of charge of the storage battery at the start point as possible, and the prediction section is a section whose end point is the time when the generated power of the photovoltaic power generation reaches the maximum value and becomes the same power as the load power It is.
- the storage battery charging / discharging system starts with a load power prediction device that predicts load power required for a load, a PV power prediction device that predicts the generated power of solar power generation, and a predetermined time.
- the predicted charge amount obtained by subtracting the load power amount that is the sum of the load power in the prediction section from the power generation amount that is the sum of the generated power in the prediction section and the predicted charge amount is positive
- the predicted charge amount in the prediction section is And a system controller that controls the state of charge of the storage battery at the starting point so that charging is possible, and the prediction section has an end point that is predicted to be the same as the load power after the generated power of solar power generation reaches the maximum value
- a storage battery charging / discharging system comprising a storage battery power converter that converts power into direct current or alternating current when charging and discharging the storage battery and the storage battery.
- the photovoltaic power generation system starts with a load power prediction device that predicts load power required for a load, a PV power prediction device that predicts the generated power of solar power generation, and a predetermined time.
- the predicted charge amount obtained by subtracting the load power amount that is the sum of the load power in the prediction section from the power generation amount that is the sum of the generated power in the prediction section and the predicted charge amount is positive
- the predicted charge amount in the prediction section is
- a system controller that controls the state of charge of the storage battery at the starting point so that charging is possible, and the prediction section has an end point that is predicted to be the same as the load power after the generated power of solar power generation reaches the maximum value
- a photovoltaic device having a power conditioner for PV for converting power generated by the solar
- the load power prediction device predicts the load power required for the load
- the PV power prediction device predicts the generated power of solar power generation
- the system controller is predetermined.
- the predicted charge amount is calculated by subtracting the load power amount that is the sum of the load power of the prediction section from the power generation amount that is the sum of the generated power of the prediction section starting from the time, and the predicted charge amount is positive
- the charging state of the storage battery at the start point is controlled so that the predicted charge amount can be charged at, and the prediction section ends at the time when the generated power of the photovoltaic power generation reaches the maximum value and is predicted to be the same as the load power. It is a section.
- the storage battery control device storage battery charging / discharging system, solar power generation system, and storage battery control method according to the present invention, surplus power generated by solar power generation even when it is not possible to sell power to the system power supply Since the state of charge of the storage battery is controlled so that all of the battery can be charged into the storage battery, the economy can be improved.
- 6 is a flowchart illustrating an operation in a first section (time t1 to t2) of the system controller according to the first embodiment of the present invention.
- 6 is a flowchart illustrating an operation in a second section (time t2 to t3) of the system controller according to the first embodiment of the present invention.
- It is an image figure of the improvement effect of the capacity maintenance rate of the storage battery to which the present invention is applied.
- It is a hardware block diagram of the system controller of the storage battery control apparatus which concerns on Embodiment 1 of this invention.
- It is a flowchart explaining the operation
- It is a flowchart explaining the operation
- FIG. 1 A photovoltaic power generation system 100 according to Embodiment 1 of the present invention will be described with reference to FIGS.
- the same reference numerals are the same or equivalent, and this is common throughout the entire specification.
- the load power represents the power required for the load 51 at a predetermined time
- the generated power represents the power generated by the solar power generation device 101 at the predetermined time.
- surplus power indicates a value obtained by removing power necessary for the load 51 from power generated by the solar power generation device 101 at a predetermined time when the generated power is larger than the load power, and a value exceeding 0. It is.
- the load power amount is a value obtained by taking the total sum (integrated value) of the load power in the predetermined section
- the power generation amount is a value obtained by taking the sum (integrated value) of the generated power in the predetermined section.
- the predicted charge amount is a value obtained by subtracting the load power amount of the load power from the power generation amount of the generated power, but the range for taking the sum is determined in advance, and details will be described later.
- FIG. 1 is a block diagram showing the whole including a photovoltaic power generation system 100 according to Embodiment 1 of the present invention.
- FIG. 1 shows a photovoltaic power generation system 100, a system power supply 50, and a load 51.
- the solar power generation system 100 is a system that can use generated power generated by solar power generation with a load 51 such as an electric appliance or store it in the storage battery 12. A specific configuration of the photovoltaic power generation system 100 will be described later.
- the solar power generation system 100 includes a solar power generation device 101, a storage battery charge / discharge system 10, a CT sensor 104, and a cable 105.
- the load 51 is, for example, an electric appliance installed in a home, and is an air conditioner, a refrigerator, a TV, or a lighting, and is driven by the generated power generated by solar power generation or the power of the system power supply 50.
- the system power supply 50 is a single-phase or three-phase commercial power supply and supplies power to the solar power generation system 100.
- the grid power supply 50 can also sell power.
- the solar power generation apparatus 101 has a solar panel 102 that is a panel that performs solar power generation, and a PV (Solar photovoltaics) power conditioner 103 that is a converter that converts the generated power generated by the solar panel 102 from direct current to alternating current. ing.
- a solar panel 102 that is a panel that performs solar power generation
- a PV (Solar photovoltaics) power conditioner 103 that is a converter that converts the generated power generated by the solar panel 102 from direct current to alternating current. ing.
- the storage battery charging / discharging system 10 includes a power storage device 11 and a storage battery control device 1.
- the generated power converted and output by the PV power conditioner 103 is mainly used by the load 51 or charged by the storage battery 12 of the storage battery charging / discharging system 10.
- the CT sensor 104 is an ammeter and is provided for grasping each electric power with respect to the solar power generation device 101, the storage battery charging / discharging system 10, and the load 51.
- Each power is estimated from the current value measured by the CT sensor 104, assuming that the voltage is 100V.
- a storage battery power conditioner 13 to be described later estimates each power and holds the estimated value.
- the electric power of the system power supply 50 is estimated from the balance of each electric power with respect to the solar power generation device 101, the storage battery charging / discharging system 10, and the load 51.
- the cable 105 connects each device (the photovoltaic power generation apparatus 101, the storage battery charge / discharge system 10, the system power supply 50, and the load 51) including the CT sensor 104, and a current or a control signal flows.
- each device the photovoltaic power generation apparatus 101, the storage battery charge / discharge system 10, the system power supply 50, and the load 51
- the cable 105 connects each device (the photovoltaic power generation apparatus 101, the storage battery charge / discharge system 10, the system power supply 50, and the load 51) including the CT sensor 104, and a current or a control signal flows.
- each apparatus the photovoltaic power generation apparatus 101, the storage battery charge / discharge system 10, the system power supply 50, and the load 51
- the CT sensor 104 the CT sensor 104
- the power storage device 11 includes a storage battery 12, a BMU (Battery Management Unit) 14, and a storage battery power conditioner 13.
- the storage battery control device 1 includes a system controller 2, a PV power prediction device 3, a load power prediction device 4, and a learning device 5.
- the storage battery 12 is charged with surplus power that is not consumed by the load 51 among the power generated by solar power generation, or power from the system power supply 50 (especially inexpensive power in the late-night charging time zone). Discharge the charged power as needed.
- the midnight power time zone is a time zone in which electricity charges are set at a low price in order to promote use in a time zone where the power demand is low, such as at night. For example, in Japan, the time between 23:00 and 7:00 am is generally set as the midnight power time zone.
- the storage battery 12 is composed of, for example, a lithium ion secondary battery, a nickel metal hydride battery, a lead storage battery, a NAS battery, or a redox flow battery.
- the storage battery 12 may be not only a stationary storage battery but also an in-vehicle storage battery, and is not limited to this.
- the BMU 14 has a state monitoring function for performing voltage measurement, current measurement, power measurement, or remaining capacity management of the storage battery 12, or a protection function such as overcharge, overdischarge, overvoltage, overcurrent, or temperature abnormality of the storage battery 12. .
- the storage battery power conditioner 13 has a function of converting electric power into direct current or alternating current when the storage battery 12 is charged and discharged. That is, when charging the storage battery 12, the storage battery power conditioner 13 converts AC power from the system power supply 50 or the photovoltaic power generation apparatus 101 into DC power and charges the storage battery 12. When discharging the storage battery 12, the DC power from the storage battery 12 is converted into AC power by the storage battery power conditioner 13, and the converted AC power is used by the load 51 or sold by the system power supply 50. Further, the storage battery power conditioner 13 includes a resistor, and the generated power generated from the photovoltaic power generation apparatus 101 cannot be consumed by the load 51, and surplus power is generated. The system power supply 50 cannot sell power, and the storage battery 12 is charged in a fully charged state. If this is not possible, it has a function of consuming surplus power with a resistor.
- the storage battery power conditioner 13 collects and manages information on the voltage, current, or power of each device measured by the CT sensor 104 or the like. Further, the storage battery power conditioner 13 notifies the system controller 2 of information such as the acquired power of each device via the BMU 14. Further, the storage battery power conditioner 13 has a function of monitoring the input / output voltage or current of the storage battery 12 and, in addition, controls power to various devices (the storage battery 12, the photovoltaic power generation apparatus 101, the system power supply 50, and the load 51). It also has a grid connection control function.
- the system controller 2 acquires information about the storage battery 12, generated power generated by solar power generation, load power, and information about the power of the system power supply 50 from the BMU 14. Further, the system controller 2 transmits a control signal related to charging / discharging of the storage battery 12 to the storage battery power conditioner 13 to control charging / discharging of the storage battery 12.
- the information of the storage battery 12 is information, such as the voltage of the storage battery 12, a charge condition, or the temperature of the storage battery 12, for example. Further, the system controller 2 controls charging / discharging of the storage battery 12 based on the prediction regarding the power obtained from the PV power prediction device 3 and the load power prediction device 4.
- the PV power prediction device 3 is a device that calculates the amount of solar radiation applied to the solar panel 102 on the date on which prediction is performed (hereinafter referred to as a prediction date), and predicts the pattern of power generated by solar power generation for one day. .
- the PV power prediction device 3 calculates the amount of solar radiation outside the atmosphere from the predicted date and the latitude and longitude of the installation location, and the weather information of the predicted date (for example, sunny, cloudy, rain, probability of precipitation, snow, humidity for each hour)
- the amount of solar radiation applied to the solar panel 102 on the predicted day is calculated in consideration of information such as temperature, etc.), and the power generated by solar power generation for one day is predicted.
- the weather information may be acquired from the Internet, for example, and the acquisition method is not limited to this.
- the load power prediction device 4 is a device that includes load power pattern data required for the load 51 according to the date or day of the week, and predicts the load power pattern based on the prediction date.
- load power pattern data for example, a general power usage pattern (such as a household average value) in an installation area is used in an initial stage where there is no pattern data that matches the usage state of the user.
- the learning device 5 stores the load power predicted by the load power prediction device 4 and the power actually required for the load 51 in a memory or the like, and the load power prediction device 4 according to the date, day of the week, or weather. Is a device that corrects the predicted load power according to the user's usage state.
- the load power prediction device 4 predicts the load power using the pattern data corrected according to the use state of the user.
- FIG. 2 is an image diagram showing fluctuations in the load power, the generated power, and the state of charge of storage battery 12 in the first embodiment of the present invention.
- the load power is indicated by a broken line 201
- the generated power expected to be generated by the solar power generation device 101 is indicated by a one-dot chain line 202
- the charged state of the storage battery 12 is indicated by a solid line 203.
- the state of charge of the storage battery 12 is represented by SOC (State Of Charge) [%], and 100 [%] is a fully charged state.
- SOC State Of Charge
- the unit of load power and generated power is power [W]
- the unit of charge state of the storage battery 12 is percentage [%].
- FIG. 2 The legend on the vertical axis in FIG. 2 indicates the load power and the generated power, and the parenthesis indicates the state of charge of the storage battery 12.
- the generated power expected to be generated by solar power generation usually starts at sunrise, reaches the maximum generated power during the day, and ends with sunset, so the graph is convex upward.
- FIG. 2 illustrates the variation over 24 hours.
- Times t1 to t3 are prediction intervals 60 predetermined by the system controller 2, time t1 is the start point of the prediction interval 60, and time t3 is the end point of the prediction interval 60.
- time t1 to t2 is referred to as a first section 61
- time t2 to t3 is referred to as a second section 62.
- the time t1 is a predetermined time, for example, a time (such as 7:00 am) when a late-night charging time zone, which is an inexpensive time zone for electricity charges, has ended.
- Time t1 is a time at which the storage battery 12 is charged to a predetermined charging state using the system power supply 50 by time t1 and starts discharging from the predetermined charging state. A method for determining a predetermined state of charge at time t1 will be described later.
- Time t2 is a time predicted by the system controller 2 when the generated power generated by solar power generation increases with the passage of time from time t1 and the generated power generated by solar power generation becomes equal to the load power. is there.
- Time t3 is a time predicted by the system controller 2 when the generated power generated by solar power generation decreases below the maximum value and the generated power and the load power become the same power.
- St 12 indicates the amount of power obtained by excluding the amount of power generation predicted to be generated by solar power generation from the amount of load power predicted to be required for the load power between times t1 and t2. That is, St 12 is the amount of electric power that is predicted to be covered by the storage battery 12 in principle.
- St 23 indicates the amount of power obtained by subtracting the load power amount predicted to be required for the load power from the power generation amount predicted to be generated by solar power generation between times t2 and t3.
- the predicted charge amount is a value obtained by removing S t12 from S t23 .
- the predicted charge amount is a value obtained by removing the load power amount from the power generation amount in the prediction section 60 (time t1 to t3).
- the SOC that is the state of charge of the storage battery 12 predicted by the system controller 2 will be described from the prediction of the transition of the SOC shown in FIG.
- the storage battery 12 is charged by the system power supply 50 so as to have a predetermined SOC.
- the storage battery 12 is discharged to supply the load 51 with electric power obtained by removing the generated power generated by solar power generation from the necessary load power, and the SOC decreases.
- surplus power obtained by removing load power required for the load 51 is charged to the storage battery 12, and the SOC increases.
- the storage battery 12 is discharged to compensate for the insufficient power. Therefore, the SOC decreases.
- the SOC variation including the times t1 to t3 shown in FIG. 2 is a conceptual diagram, and thus is shown in a straight line. However, since the load power and the generated power fluctuate in a curved line, the SOC variation Is not necessarily linear. Moreover, since the discharge of the storage battery 12 from the time t1 to the time t2 is discharged corresponding to the load power required for the load 51, the discharge is performed by changing the current value of the storage battery 12.
- the charging state of 12 is a charging state in which the predicted charging amount of solar power generation obtained by removing the load power amount of the load power from the power generation amount of the generated power in the prediction section 60 can be charged to the storage battery 12.
- the charging of the storage battery 12 is controlled.
- the system controller 2 predicts a predetermined state of charge.
- charging of the storage battery 12 for charging the estimated charge amount at time t1 is performed in the late-night power hours (from 23:00 to 7:00 AM) where the electricity rate is low. ), It is economical.
- the system controller 2 discharges the storage battery 12 in the first section 61 (time t1 to t2) in the prediction section 60 (time t1 to t3), and supplies surplus power in the second section 62 (time t2 to t3). All the battery 12 is charged.
- SOC 100 [%]
- the storage battery 12 may be fully charged before the time t1.
- the PV power prediction device 3 uses the maximum value of the power generation amount predicted from the weather information as the prediction value for the prediction value of the power generation amount of the photovoltaic power generation in the prediction section 60, and the load power prediction device 4 Regarding the predicted value of the electric energy at 60, it is preferable that the minimum value among the electric energy predicted from the date and time or the day of the week is used as the predicted value. By doing so, even if there is an error in prediction, it is possible to suppress the case where all the surplus power cannot be charged in the storage battery 12.
- the load power prediction device 4 includes the learning device 5 that corrects the load 51 pattern according to the date and time or day of the week using the actually measured load power, the learning device 5 is adapted to the user's life pattern.
- the usage status of the load 51 can be learned, and the load 51 pattern can be updated or selected. Therefore, since the load 51 pattern with high accuracy according to the user can be predicted and used, the prediction accuracy of the photovoltaic power generation system 100 can be improved.
- the predetermined charging state at time t1 may be a value smaller than the charging state predicted by the system controller 2 in consideration of the prediction error. By doing so, even if there is an error in prediction, it is possible to suppress the case where all the surplus power cannot be charged in the storage battery 12.
- the prediction error may be obtained based on past prediction information stored in the learning device 5.
- FIG. 3 is a flowchart for explaining the operation of the storage battery control device 1 according to Embodiment 1 of the present invention in the midnight power time zone.
- FIG. 6 is a flowchart for explaining the operation at times t1 to t2 in the prediction interval 60 of the system controller 2 according to Embodiment 1 of the present invention.
- FIG. 7 is a flowchart for explaining the operation at times t2 to t3 in the prediction interval 60 of the system controller 2 according to Embodiment 1 of the present invention.
- step ST101 the system controller 2 predicts the generated power of the photovoltaic power generation and the load power necessary for the load 51 on the prediction date, so that the PV power prediction device 3 predicts the generated power and the load power prediction device 4 Send a signal to predict the load power.
- the predicted date is the next day if the execution time of the flowchart of FIG. 3 is between 23:00 and 24:00, and the current day if the execution time of the flowchart of FIG.
- step ST102 when receiving the signal from the system controller 2, the PV power prediction device 3 generates a prediction pattern of the generated power on the prediction date.
- the PV power prediction device 3 transmits the generated prediction of the generated power on the predicted date to the system controller 2.
- step ST103 when receiving a signal from the system controller 2, the load power prediction device 4 generates a prediction pattern of the load power on the prediction date.
- the load power prediction device 4 transmits a prediction of the generated load power on the predicted date to the system controller 2. Note that the load power prediction device 4 generates a prediction of the load power by referring to the actual measured value of the past load power stored in the learning device 5 when the load power is predicted.
- step ST104 the system controller 2 acquires the prediction of the generated power and the load power on the prediction date predicted from the PV power prediction device 3 and the load power prediction device 4, respectively.
- step ST ⁇ b> 105 the system controller 2 predicts the prediction section 60 (on the prediction date) from the prediction of the generated power of the photovoltaic power generation obtained from the PV power prediction device 3 and the load power prediction device 4 and the load power necessary for the load 51, respectively.
- the first section 61 and the second section 62) are determined.
- the system controller 2 estimates, as the end point (time t3) of the prediction section 60, the time when the acquired generated power of the solar power generation becomes lower than the maximum value and becomes equal to the load power.
- the start point (time t1) of the prediction interval 60 is a predetermined time at which the midnight power time period ends, for example, 7 am.
- the system controller 2 estimates the time estimated that the generated power increases and becomes the same as the load power after the power generation by the solar power generation apparatus 101 starts as the time t2. Thereby, the system controller 2 can determine the prediction interval 60 (time t1 to t3), the first interval 61 (time t1 to t2), and the second interval 62 (time t2 to t3).
- step ST ⁇ b> 106 the system controller 2 compares the power generation amount obtained from the prediction of the generated power of the solar power generation in the prediction section 60 on the prediction date with the power amount obtained from the prediction of the load power necessary for the load 51. To do.
- the process proceeds to step ST107.
- the system controller 2 determines that the generated power amount of the generated power is smaller than the load power amount of the load power in the prediction section 60, the process proceeds to step ST108.
- comparison of the power generation amount of generated power with load power of the load power in the prediction interval 60 corresponds to the comparison of the S t12 and S t23 in FIG. That is, the system controller 2, if S t23 is equal to or greater than S t12 proceeds to ST 107, if S t23 is less than S t12 may proceed to ST 108.
- step ST107 the system controller 2 determines the state of charge of the storage battery 12 at time t1.
- the state of charge of the storage battery 12 at time t1 is a state of charge that is predicted to be fully chargeable with respect to the predicted charge amount.
- step ST109 the system controller 2 charges the storage battery 12 so that the storage battery 12 is charged at the time t1 determined in step ST107 or step ST108, and completes charging when the target charging state is reached. finish.
- the system controller 2 may charge the storage battery 12 to the estimated charge amount with the system power supply 50 in the late-night power hours when the charge is low by time t1. Since charging is performed using the system power supply 50, it is assumed that the storage battery 12 is not charged up to the predicted charge amount at time t1, and the storage battery 12 is not charged up to the predicted charge amount at time t1. There is little need to make another prediction about generated power and load power after t1. Therefore, the system controller 2 may control the storage battery 12 based on the prediction of the generated power and the load power at times t1 to t3 predicted in the midnight power time zone.
- FIG. 4 is a flowchart for explaining an example of a method for generating a prediction pattern of generated power according to Embodiment 1 of the present invention.
- step ST110 the PV power prediction device 3 acquires weather information on the prediction date from, for example, the Internet.
- the PV power prediction device 3 acquires past weather information and a predicted pattern of generated power. Then, the PV power prediction device 3 compares the weather information on the prediction date with the acquired past weather information, and if the weather information matches, the PV power prediction device 3 sets the prediction pattern of the generated power corresponding to the past weather information on the prediction date. It decides to use for the generation of the prediction pattern of generated electric power. When comparing weather information, not only the weather such as cloudy weather but also the probability of precipitation, humidity, or temperature may be considered.
- the past weather information and the prediction pattern of the corresponding generated power for example, when stored in the storage battery control device 1, are the past weather information stored in the PV power prediction device 3 and the prediction of the corresponding generated power. A pattern may be used, or the PV power prediction device 3 may be acquired from the Internet or the like.
- the PV power prediction device 3 In step ST112, the PV power prediction device 3 generates a prediction pattern of the generated power on the prediction date based on the prediction pattern of the past generated power determined in step ST111.
- the PV power prediction device 3 may generate a prediction pattern of the generated power on the prediction date by correcting the prediction pattern of the generated power in the past in consideration of the probability of precipitation, humidity, or temperature. By performing the correction, the accuracy of the predicted pattern of the generated power on the predicted date can be increased. Then, the PV power prediction device 3 outputs a prediction pattern of the generated power on the generated prediction date to the system controller 2.
- the PV power prediction device 3 acquires the predicted pattern of the generated power at the same time when the predicted pattern of the generated power is acquired, for example, when the predicted date is May 15, 2016. Is preferred. For example, when the prediction date is May 15, 2016, the PV power prediction device 3 sets the prediction pattern of the generated power on May 15 (for example, May 15, 2015) of the year before 2016. get. Further, the PV power prediction apparatus 3 predicts the generated power prediction pattern during a predetermined period (for example, from May 5 to May 25) centering on the day corresponding to the prediction date of the year before the prediction date. Of course it's also good to get. By doing in this way, the change of the solar radiation amount and solar radiation time by a season can be suppressed, and the PV electric power prediction apparatus 3 can produce
- a predetermined period for example, from May 5 to May 25
- FIG. 5 is a flowchart illustrating an example of a load power prediction pattern generation method according to Embodiment 1 of the present invention.
- step ST113 the load power prediction device 4 acquires weather information on the prediction date from, for example, the Internet.
- step ST113 the load power prediction device 4 estimates the day of the week corresponding to the prediction date.
- the load power prediction device 4 acquires the day of the week corresponding to the date on which the actual measurement value and the actual measurement value of the past load power stored in the learning device 5 are measured.
- the load power prediction device 4 compares the day of the week corresponding to the day on which the actual measurement value of the acquired past load power is measured with the day of the week corresponding to the prediction date, and if the day of the week matches, the acquired past load It determines so that the measured value of electric power may be used for the production
- the load power prediction device 4 may take into account not only the day of the week but also weather information such as weather, the probability of precipitation, humidity, or temperature during the comparison.
- the load power prediction device 4 In step ST115, the load power prediction device 4 generates a prediction pattern of the load power on the prediction date based on the actual measurement value of the past load power determined in step ST114.
- the load power prediction device 4 may generate a prediction pattern of load power on the prediction day by correcting the actual measurement value of the past load power in consideration of the probability of precipitation, humidity, or temperature. By performing the correction, it is possible to improve the accuracy of the prediction pattern of the load power on the prediction day. Then, the load power prediction device 4 outputs the prediction pattern of the generated load power on the predicted date to the system controller 2.
- the load power prediction device 4 preferably acquires a predicted pattern of generated power at the same time when acquiring a past measured value of load power.
- a predicted pattern of generated power in a predetermined period centered on a day corresponding to a predicted date of the year before the predicted date.
- the load power prediction device 4 can easily perform a more accurate load power prediction pattern.
- the load power prediction device 4 may obtain the day of the week corresponding to the date from the Internet or the like.
- FIG. 6 is a flowchart for explaining the operation in the first section 61 (time t1 to t2) of the system controller 2 according to the first embodiment of the present invention. This flowchart starts at time t1.
- step ST ⁇ b> 121 the system controller 2 acquires the generated power of the photovoltaic power generation and the actually measured load power required by the load 51 via the BMU 14 of the power storage device 11 via the BMU 14 of the power storage device 11.
- the generated power generated by solar power generation is used as load power, but there is a shortage that cannot be covered by the generated power alone.
- the system controller 2 covers the shortage of power with respect to the load power that cannot be covered only by the generated power based on the information on the generated power and the actual measured value of the load power acquired in step ST121.
- the output value is changed by changing the current value of the power storage device 11 according to the value of the insufficient power that cannot be covered by the generated power alone with respect to the load power. Therefore, the discharge from the power storage device 11 can cover a shortage of power that cannot be covered only by the generated power with respect to the load power.
- step ST123 the system controller 2 acquires the state of charge of the storage battery 12 that has changed due to the discharge.
- step ST124 the system controller 2 ends the flowchart when determining that the time t2 has elapsed, and proceeds to step ST125 when determining that the time t2 has not elapsed.
- step ST125 the system controller 2 ends the flowchart when determining that the state of charge of the storage battery 12 has decreased to the target state of charge, and when determining that the state of charge of the storage battery 12 has not decreased to the target state of charge. Proceed to step ST121.
- FIG. 7 is a flowchart for explaining the operation in the second section 62 (time t2 to t3) of the system controller 2 according to Embodiment 1 of the present invention.
- the flowchart of FIG. 7 starts at time t2.
- step ST131 the system controller 2 acquires the measured power value of the photovoltaic power generation and the load power required by the load 51 via the BMU 14 of the power storage device 11.
- step ST132 the system controller 2 compares the magnitude of the absolute value of the generated power and the load power from the generated power of the solar power generation acquired in step ST131 and the actually measured load power required by the load 51. When the generated power is larger than the load power, the process proceeds to step ST133, and when the load power is equal to or less than the generated power, the process proceeds to step ST134.
- step ST133 the system controller 2 causes the storage battery 12 to be charged with surplus power that is not consumed by the load 51 among the generated power of the solar power generation.
- Step ST134 is a step for dealing with a case where the prediction and actual measurement of load power and generated power greatly deviate due to factors such as failure.
- the system controller 2 discharges the shortage from the storage battery 12 for the shortage of power that cannot be covered by the generated power with respect to the load power. Then, the process proceeds to step ST131.
- step ST135 the system controller 2 acquires the state of charge of the storage battery 12 because the state of charge of the storage battery 12 changes due to charging.
- step ST136 the system controller 2 ends the flowchart when determining that the time t3 has elapsed, and proceeds to step ST137 when determining that the time t3 has not elapsed.
- step ST137 the system controller 2 ends the flowchart when it is determined that the state of charge of the storage battery 12 has reached full charge, and when it is determined that the state of charge of the storage battery 12 has not reached full charge, step ST131. Proceed to
- FIG. 8 is an image diagram of the effect of improving the capacity maintenance rate of the storage battery 12 to which the present invention is applied.
- a solid line is a conventional example, and a broken line is an embodiment when the present invention is applied.
- the origin represents the start of comparison, and the capacity retention rate of the storage battery 12 to which the present invention is applied and the conventional storage battery 12 are both 100 [%].
- Time T is the time approximately 10 years after the start of comparison, point A indicates the capacity maintenance rate of the conventional storage battery 12 at this time T, and point B indicates the capacity maintenance rate of the storage battery 12 to which the present invention is applied at time T. Indicates.
- the capacity maintenance rate at the point B of the storage battery 12 to which the present invention is applied is higher than the capacity maintenance rate at the point A and is 5 to 10%. Can be expected to improve.
- the system controller 2 controls the state of charge of the storage battery 12 so that the surplus power can be charged to the storage battery 12 in the prediction section 60 (time t1 to t3), generation of surplus power can be suppressed. Therefore, it is possible to avoid power generation suppression of solar power generation for suppressing the increase in the voltage of the system power supply due to the sale of surplus power, and an improvement in economic efficiency can be expected.
- the system controller 2 determines that the start time (23:00) of the late-night charging time zone on January 20, 2015 has elapsed, the system controller 2 generates power and load on the predicted date (January 21, 2015). The power is predicted by the PV power prediction device 3 and the load power prediction device 4.
- the PV power prediction device 3 obtains the weather data and solar radiation data on January 21, 2015, which is the forecast date, via the Internet when predicting the generated power on the forecast date, and the obtained data and solar power generation Based on the capacity of the device 101, the generated power on the prediction date is predicted.
- the load power prediction device 4 uses the learning device 5 to predict the load power when predicting the load power.
- the storage battery 12 had a discharge capacity of 60 Ah, a battery capacity of 6 kWh, and a single cell average voltage of 3.7 V in 27 series.
- the end time of the late-night charging time zone is 7:00 am (time t1)
- the PV power prediction device 3 is 8:00 am when the output from the solar power generation device 101 starts
- the output from the solar power generation device 101 is Consider a case where the end time is predicted to be 15:00. It is assumed that the weather is predicted as sunny when the generated power is predicted. Further, it is assumed that the system controller 2 predicts the time t2 as 9:20 am and the time t3 as 13:42 from the prediction of the load power and the generated power.
- the amount of generated power expected by the system controller 2 between time t1 and time t3 is 8.7 kWh (time t1 to t2: 0.91 kWh, time t2 to t3: 7.79 kWh).
- the load power amount expected to be necessary by the system controller 2 for the load 51 is 6.53 kWh (time t1 to t2: 2.84 kWh, time t2 to t3: 3.69 kWh).
- the load power required by the load 51 is supplied by discharging the battery 12.
- the system controller 2 charges the storage battery 12 with all of the estimated charge amount.
- the state of charge of the storage battery 12 at t1 is determined.
- FIG. 9 is a hardware configuration diagram of the system controller 2 of the storage battery control device 1 according to Embodiment 1 of the present invention.
- the processing of the system controller 2 in the storage battery control device 1 is realized by executing a program stored in the memory 91 shown in FIG. 9 by a processor 90 such as a CPU (Control Processing Unit).
- the processor or the memory may be included not only in the system controller 2 but also in the PV power prediction device 3, the load power prediction device 4, and the learning device 5.
- the load power prediction device 4 that predicts the load power required for the load 51 and the PV power prediction device 3 that predicts the generated power of solar power generation.
- a prediction section 60 starting from a predetermined time, starting from the power generation of photovoltaic power generation and decreasing after the power generation power reaches its maximum value, and ending at a time predicted to be the same power as the load power ,
- the power generation amount that is the sum of the generated power is larger than the load power amount that is the sum of the load power
- the charge state of the storage battery 12 at the starting point is obtained by removing the load power amount of the load power from the power generation amount of the generated power
- a system controller 2 that controls the state of charge of the storage battery 12 by the system power supply 50 is provided so that the storage battery 12 can be charged with the entire estimated charge amount by solar power generation.
- the storage battery charging / discharging system 10 in Embodiment 1 of this invention when charging / discharging the said storage battery control apparatus 1, the storage battery 12, and the storage battery 12, it has the storage battery power conditioner 13 which converts electric power into direct current or alternating current.
- the said storage battery charging / discharging system 10 the solar panel 102 which is a panel which performs solar power generation, and the electric power generated with the solar panel 102 are changed from direct current to alternating current. And a photovoltaic power generation apparatus 101 having a PV power conditioner 103 to be converted.
- the load electric power prediction apparatus 4 estimates required load electric power with respect to the load 51, and the PV electric power prediction apparatus 3 estimates the electric power generation of solar power generation.
- the system controller 2 starts from a predetermined time, and when the power generation of solar power generation starts and the generated power decreases after reaching the maximum value, the time predicted to become the same power as the load power is the end point.
- the charge state of the storage battery 12 at the starting point is The charged state of the storage battery 12 by the system power supply 50 is controlled so that the storage battery 12 can be charged with the entire estimated charge amount by solar power generation except for.
- the state of charge of the storage battery 12 since the state of charge of the storage battery 12 has been set to an arbitrary value, if it becomes impossible to sell power to the system power supply 50, the surplus power cannot be fully charged to the storage battery 12, and the power generation of the PV power generation apparatus is suppressed. I had to. According to such a configuration, the state of charge of the storage battery 12 is controlled so that the surplus power generated by solar power generation can be charged to the storage battery 12 in preparation for the case where surplus power cannot be sold to the system power supply 50. Therefore, the economy can be improved without wasting surplus power.
- the system controller 2 discharges the storage battery 12 in the first section 61 whose end point is a time at which the generated power increases from the start point and is predicted to be the same power as the load power in the prediction section 60.
- the storage battery 12 is charged with all surplus power obtained by removing the load power from the generated power. You can also.
- the time zone during which the storage battery 12 is discharged and the time zone during which the storage battery 12 is charged can be clearly separated, so that the controllability of the storage battery 12 can be improved.
- the PV power prediction device 3 may be configured such that the predicted value of the amount of photovoltaic power generation in the prediction section 60 is the maximum value among the amounts of power predicted from weather information.
- the load power prediction device 4 may be configured such that the predicted value of the power amount in the prediction section 60 uses the minimum value among the power amounts predicted from the date and time or day of the week as the predicted value.
- the load power prediction device 4 predicts the predicted value of the load power amount predicted from the date and time or the day of the week with the minimum value, so even if there is an error in the prediction, It can be suppressed that the generated power is not used for the load power and the power for charging the storage battery 12.
- the load power prediction device 4 may include a learning device 5 that corrects the load 51 pattern according to the date and time or day of the week using the actually measured load power.
- the learning device 5 can learn the actual usage status of the load 51 in accordance with the user's life pattern, and can update or select the load 51 pattern. Therefore, since the load 51 pattern with high accuracy according to the user can be predicted and used, the prediction accuracy of the photovoltaic power generation system 100 can be improved.
- FIG. A photovoltaic power generation system 100 according to Embodiment 2 of the present invention will be described with reference to FIG. Note that, in the photovoltaic power generation system 100 according to the first embodiment, an example that can cope with a case where the load power required for the load 51 varies by changing the current value when the power storage device 11 is discharged will be described. did. In the second embodiment of the present invention, a modification in which the current value is a constant value when the power storage device 11 is discharged in the first section 61 will be described. The following description will focus on differences from the first embodiment, and description of the same or corresponding parts will be omitted as appropriate.
- FIG. 10 is a flowchart for explaining the operation in the first section 61 (time t1 to t2) of the system controller 2 according to the second embodiment of the present invention.
- the flowchart of FIG. 10 corresponds to step ST121 and step ST202, step ST123 and step ST206, step ST124 and step ST207, and step ST125 and step ST208, respectively.
- step ST201, step ST203, step ST204, and step ST205 different from FIG. 6 will be described.
- the system controller 2 determines the discharge current value of the storage battery 12 based on the already obtained prediction of the generated power and the load power on the predicted date.
- the current value is set to a constant value when the power storage device 11 is discharged, and the power storage device 11 is 1.93 kWh in the first section 61 (time t1 to t2). Is expected to be discharged. Since the voltage at the time of discharging the power storage device 11 is 100 [V], the system controller 2 determines the current value to be a constant value of 8.27 [A].
- step ST203 the system controller 2 compares the generated power acquired in step ST202 with the load power. If the value obtained by subtracting the generated power from the load power is larger than the output of the storage battery 12, the system controller 2 proceeds to step ST204. Proceed to ST205.
- step ST204 the system controller 2 discharges the storage battery 12 at a constant current value in order to cover the load power required by the load 51. Since the discharge from the storage battery 12 is a constant value (827 [W] in Embodiment 2 of the present invention), when the value obtained by subtracting the generated power from the load power exceeds the power discharged from the storage battery 12, the grid power supply 50 To make up for the shortage.
- step ST205 since the electric power discharged from the storage battery 12 is excessive from the value obtained by subtracting the generated electric power from the load electric power, the system controller 2 consumes the excess by the resistance included in the storage battery power conditioner 13. Therefore, the system controller 2 can discharge the storage battery 12 at a constant value and charge the storage battery 12 with all the surplus power from time t2 to time t3.
- the system controller 2 is characterized in that the storage battery 12 is discharged at a constant current value in the first section 61.
- the storage battery 12 since the storage battery 12 is discharged at a constant current value, it is not affected by sudden fluctuations in the generated power or load power, so that the deterioration of the storage battery 12 can be suppressed and the life can be extended. I can expect.
- the photovoltaic power generation system 100 when the electric power discharged from the storage battery 12 is excessive from the value obtained by subtracting the generated electric power from the load electric power at the time t1 to t2, the excessive amount is increased. In this case, it is possible to stop the discharge of the storage battery 12 from time t1 to t2 and discharge the power corresponding to the excess from time t2 to t3.
- FIG. 1 A photovoltaic power generation system 100 according to Embodiment 3 of the present invention will be described with reference to FIG.
- a modified example of the method for charging and discharging the storage battery 12 at times t1 to t3 will be described.
- the following description will focus on differences from the first embodiment, and description of the same or corresponding parts will be omitted as appropriate.
- FIG. 11 is a flowchart for explaining the operation in the prediction section 60 (time t1 to t3) of the system controller 2 according to Embodiment 3 of the present invention.
- the flowchart of FIG. 11 is executed instead of the flowchart of system controller 2 shown in FIGS. 6 and 7 of Embodiment 1 of the present invention.
- the flowchart of FIG. 11 starts at time t1.
- step ST301 the system controller 2 acquires the generated power of the photovoltaic power generation and the measured load power required by the load 51 via the BMU 14 of the power storage device 11 via the BMU 14 of the power storage device 11.
- step ST302 the system controller 2 compares the generated power with the load power. When the system controller 2 determines that the generated power is smaller than the load power, the process proceeds to step ST303, and when the system controller 2 determines that the generated power is equal to or greater than the load power, the process proceeds to step ST304.
- step ST303 since the system controller 2 cannot cover the load power with only the generated power, the system controller 2 discharges the storage battery 12 to compensate for the shortage. Then, the process proceeds to step ST305.
- step ST304 the system controller 2 charges the storage battery 12 with surplus power obtained by removing load power from the generated power. Then, the process proceeds to step ST305.
- step ST305 the system controller 2 acquires the state of charge of the storage battery 12 that has changed due to discharging or charging.
- step ST306 the system controller 2 determines whether or not the state of charge of the storage battery 12 has reached full charge.
- the process proceeds to step ST301. Further, when it is determined that the state of charge of the storage battery 12 is equal to or less than a predetermined state of charge, the flowchart may be terminated and the storage battery 12 may be charged using the system power supply.
- the embodiments can be freely combined within the scope of the invention, and the embodiments can be appropriately modified or omitted.
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Abstract
Description
本発明の実施の形態1に係る太陽光発電システム100を図1~9により説明する。図において、同一の符号を付したものは、同一またはこれに相当するものであり、このことは、明細書の全文において共通することである。
本発明の実施の形態2に係る太陽光発電システム100を図10により説明する。なお、実施の形態1に係る太陽光発電システム100においては、蓄電装置11の放電の際に電流値を変化させることで、負荷51に必要となる負荷電力が変動する場合でも対応できる例を説明した。本発明の実施の形態2では、第一区間61において蓄電装置11の放電の際に電流値を一定値とする変形例について説明する。以下に実施の形態1と異なる点を中心に説明し、同一または対応する部分についての説明は適宜省略する。
本発明の実施の形態3に係る太陽光発電システム100を図11により説明する。本発明の実施の形態3では、時刻t1~t3における蓄電池12の充放電方法の変形例について説明する。以下に実施の形態1と異なる点を中心に説明し、同一または対応する部分についての説明は適宜省略する。
Claims (14)
- 負荷に対し必要な負荷電力を予測する負荷電力予測装置と、
太陽光発電の発電電力を予測するPV電力予測装置と、
予め定められた時刻を始点とする予測区間の前記発電電力の総和である発電量から前記予測区間の前記負荷電力の総和である負荷電力量を除いた予測充電量を求め、前記予測充電量が正である場合に、前記予測区間において前記予測充電量が充電可能なよう前記始点における蓄電池の充電状態を制御するシステムコントローラとを備え、
前記予測区間は、前記太陽光発電の前記発電電力が最大値を迎えた後に前記負荷電力と同電力になると予測する時刻を終点とする区間である蓄電池制御装置。 - 前記システムコントローラは、前記予測区間のうち、前記始点から前記発電電力が増加し前記負荷電力と同電力になると予測される時刻を終点とする第一区間において、前記蓄電池を放電させ、前記第一区間の終点から、前記発電電力が低下し前記負荷電力と同電力になると予測される時刻までの第二区間において、前記発電電力から前記負荷電力を除いた余剰電力を全て前記蓄電池に充電する
請求項1に記載の蓄電池制御装置。 - 前記システムコントローラは、前記第一区間において、前記蓄電池を一定の電流値で放電させる
請求項2に記載の蓄電池制御装置。 - 前記PV電力予測装置は、前記予測区間における前記太陽光発電の前記発電量の予測値について、気象情報から予測される発電量のうち最大値を予測値とする
請求項1~3のいずれか一項に記載の蓄電池制御装置。 - 前記負荷電力予測装置は、前記予測区間における前記負荷電力量の予測値について、日時または曜日から予測される前記負荷電力量のうち最小値を予測値とする
請求項1~4のいずれか一項に記載の蓄電池制御装置。 - 前記負荷電力予測装置が有する日時または曜日に応じた負荷パターンについて、実測された負荷電力を用いて修正を行う学習装置を備える
請求項5に記載の蓄電池制御装置。 - 請求項1~6のいずれか一項に記載の蓄電池制御装置と、
前記蓄電池および前記蓄電池を充放電する際に、電力を直流または交流に変換する蓄電池用パワコンを有する蓄電装置と
を備える蓄電池充放電システム。 - 請求項7に記載の蓄電池充放電システムと、
前記太陽光発電を行うパネルであるソーラーパネル、および前記ソーラーパネルで発電した電力を直流から交流に変換するPV用パワコンを有する太陽光発電装置と
を備える太陽光発電システム。 - 負荷電力予測装置が、負荷に対し必要な負荷電力を予測し、
PV電力予測装置が、太陽光発電の発電電力を予測し、
システムコントローラが、予め定められた時刻を始点とする予測区間の前記発電電力の総和である発電量から前記予測区間の前記負荷電力の総和である負荷電力量を除いた予測充電量を求め、前記予測充電量が正である場合に、前記予測区間において前記予測充電量が充電可能なよう前記始点における蓄電池の充電状態を制御し、
前記予測区間は、前記太陽光発電の前記発電電力が最大値を迎えた後に前記負荷電力と同電力になると予測する時刻を終点とする区間である蓄電池制御方法。 - 前記システムコントローラが、前記予測区間のうち、前記始点から前記発電電力が増加し前記負荷電力と同電力になると予測される時刻を終点とする第一区間において、前記蓄電池を放電させ、前記第一区間の終点から、前記発電電力が低下し前記負荷電力と同電力になると予測される時刻までの第二区間において、前記発電電力から前記負荷電力を除いた余剰電力を全て前記蓄電池に充電する
請求項9に記載の蓄電池制御方法。 - 前記システムコントローラが、前記第一区間において、前記蓄電池を一定の電流値で放電させる
請求項10に記載の蓄電池制御方法。 - 前記PV電力予測装置が、前記予測区間における前記太陽光発電の前記発電量の予測値について、気象情報から予測される発電量のうち最大値を予測値とする
請求項9~11のいずれか一項に記載の蓄電池制御方法。 - 前記負荷電力予測装置が、前記予測区間における前記負荷電力量の予測値について、日時または曜日から予測される前記負荷電力量のうち最小値を予測値とする
請求項9~12のいずれか一項に記載の蓄電池制御方法。 - 学習装置が、前記負荷電力予測装置が有する日時または曜日に応じた負荷パターンについて、実測された負荷電力を用いて修正を行う
請求項13に記載の蓄電池制御方法。
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