WO2011118771A1 - Système de charge/décharge - Google Patents

Système de charge/décharge Download PDF

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Publication number
WO2011118771A1
WO2011118771A1 PCT/JP2011/057359 JP2011057359W WO2011118771A1 WO 2011118771 A1 WO2011118771 A1 WO 2011118771A1 JP 2011057359 W JP2011057359 W JP 2011057359W WO 2011118771 A1 WO2011118771 A1 WO 2011118771A1
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Prior art keywords
power
output
charge
discharge
voltage
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PCT/JP2011/057359
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English (en)
Japanese (ja)
Inventor
健仁 井家
総一 酒井
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三洋電機株式会社
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Publication of WO2011118771A1 publication Critical patent/WO2011118771A1/fr

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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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a charge / discharge system, and more particularly, to a charge / discharge system including a storage battery capable of storing electric power generated by a power generation device.
  • the output of the power generation device using renewable energy may change rapidly depending on the weather.
  • Such an abrupt change in the output of the power generation apparatus has a significant adverse effect on the frequency stability of the interconnected power system.
  • This adverse effect becomes more prominent as more consumers have power generation devices that use renewable energy. For this reason, when the number of customers who have power generation devices that use renewable energy increases in the future, it is necessary to maintain the stability of the power system by suppressing the rapid change in the output of the power generation devices. Will arise.
  • a power generation system including a storage battery capable of storing the power generated by the power generation device using renewable energy has been proposed.
  • Such a power generation system is disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-27797.
  • JP 2009-27797 A includes a solar cell, an inverter (power output unit) connected to the solar cell via a bus, and a power storage unit connected to the bus via a charge / discharge unit.
  • a power generation system is disclosed.
  • the power generated by the power generation device is smaller than the desired amount of power, the power generated by the power generation device and the power stored in the power storage unit are combined. The power is output to the power system via the power output unit.
  • a general power output unit often has a maximum power tracking control function that tracks the maximum power value by changing the voltage, and the power output unit having such a maximum power tracking control function is not provided.
  • the power output unit may malfunction.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a charge / discharge system capable of suppressing malfunction of the power output unit.
  • a charging / discharging system includes a storage battery that is connected to a power generation device and stores power generated by the power generation device, and power that discharges power stored in the storage battery.
  • a discharge power conversion unit for conversion a power output unit connected to the discharge power conversion unit and the power system, and outputting power supplied by the discharge power conversion unit to the power system, and output from the discharge power conversion unit to the power output unit
  • a control unit that controls the output power so that the power changes according to the voltage and has an output characteristic having a peak power.
  • the control unit controls the power output from the discharge power conversion unit to the power output unit so that the power changes according to the voltage and has an output characteristic having a peak power. Since the power output from the power conversion unit has peak power, maximum power tracking control in which the power output unit tracks the maximum value of power by changing the voltage can be appropriately performed. As a result, the power output from the discharge power conversion unit does not have peak power, and the power output unit can be prevented from malfunctioning, unlike when the power is constant even when the voltage is changed. Therefore, the power generation device is connected to the power system via the power output unit, and a storage battery and a control unit are added later to a grid-connected power generation system that does not have a storage battery, thereby facilitating the charge / discharge system according to the present invention. Can be configured.
  • the solar power generation system 1 is connected to a power generation device 2 including a solar battery that generates power using sunlight, a power storage device 3 capable of storing electric power generated by the power generation device 2, and a power system 50.
  • the power output unit 4 includes an inverter that outputs the power stored in the power storage device 3 to the power system 50, and the charge / discharge control unit 5 that controls charging / discharging of the power storage device 3.
  • a load 60 is connected to the AC side bus connecting the power output unit 4 and the power system 50.
  • the power storage device 3 includes a storage battery 31 connected in series to the DC side buses 6 a and 6 b and a charge / discharge unit 32 that charges and discharges the storage battery 31.
  • a secondary battery for example, a Li-ion storage battery, a Ni-MH storage battery, etc.
  • the voltage of the storage battery 31 is about 48V.
  • the charging / discharging unit 32 includes a DC-DC converter 33 provided between the power generation device 2 and the storage battery 31 and connected to the DC side bus 6a.
  • the DC-DC converter 33 steps down the voltage supplied from the power generator 2 to the DC side bus 6a to a voltage suitable for charging the storage battery 31, thereby supplying power from the DC side bus 6a to the storage battery 31 side. It has a function to supply.
  • the DC-DC converter 33 is an example of the “charging power conversion unit” in the present invention.
  • the DC-DC converter 33 performs so-called MPPT (Maximum Power Point Tracking) control.
  • the MPPT control function is a function that automatically adjusts the operating voltage of the power generator 2 so that the power generated by the power generator 2 is maximized. Specifically, in the power-voltage characteristics (PV characteristics) of the solar cell shown in FIG. 2, for example, when the operating voltage is V1 and the generated power is operating at point A of P1, the operating voltage is changed from V1. If the generated power P2 at the voltage V2 is greater than P1 (P1 ⁇ P2) by changing to V2, the operating voltage of the power generator 2 is set to V2 (point B).
  • PV characteristics power-voltage characteristics
  • the MPPT control function monitors the increase / decrease in the generated power and controls the power generator 2 to operate at the maximum power point.
  • a diode (not shown) is provided between the power generator 2 and the DC-DC converter 33 to prevent the current from flowing backward toward the normal power generator 2.
  • the charging / discharging unit 32 includes a DC-DC converter 34 provided between the power output unit 4 and the storage battery 31 and connected to the DC side bus 6b.
  • the DC-DC converter 34 is not connected to the power generator 2 (DC side bus 6a). That is, a path for supplying power from the power generation device 2 to the power storage device 3 (DC-DC converter 33) and a path for outputting power from the DC-DC converter 34 to the power output unit 4 are sandwiched between the power storage devices 3. It is separated. Therefore, DC side bus 6a and DC side bus 6b are also separated with power storage device 3 interposed therebetween.
  • the DC-DC converter 34 boosts the voltage of the power supplied from the storage battery 31 to the DC side bus 6b to near the voltage of the DC side bus 6b, thereby supplying power from the storage battery 31 side to the DC side bus 6b. Has the function of discharging.
  • the DC-DC converter 34 is an example of the “discharge power conversion unit” in the present invention.
  • the charge / discharge control unit 5 is connected to a DC-DC converter 33, a DC-DC converter 34, and a generated power detection unit 7 described later. Then, the charge / discharge control unit 5 performs charge / discharge control of the storage battery 31 by controlling the DC-DC converter 33 and the DC-DC converter 34. Specifically, the charge / discharge control unit 5 charges the storage battery 31 without outputting the power generated by the power generation device 2 to the power output unit 4, and sets output power to be described later from the storage battery 31 to the power output unit 4. It is comprised so that it may output to.
  • the charge / discharge control unit 5 is an example of the “control unit” in the present invention.
  • the charging / discharging control unit 5 is configured so that the output from the DC-DC converter 34 has a voltage-power characteristic (PV characteristic) as indicated by a solid line in FIG.
  • the DC converter 34 is configured to be controlled.
  • the power output unit 4 has an MPPT control function, like the DC-DC converter 33 described above. That is, in the power-voltage characteristic (PV characteristic) of the output of the DC-DC converter 34 shown in FIG. 3, the voltage (Vop) that maximizes the power output from the DC-DC converter 34 is searched. ing.
  • the charge / discharge control unit 5 increases the voltage with respect to the output power of the DC-DC converter 34, reaches a maximum value at the voltage (Vop), and then decreases with the voltage.
  • the power output unit 4 can easily perform the MPPT control. Note that the PV characteristics shown in FIG. 3 are adjusted so as to have a substantially symmetric shape with respect to a straight line passing through a voltage (Vop) at which the output power becomes maximum.
  • the power output output from the DC-DC converter 34 is performed.
  • the duty ratio of the pulse signal (the ratio between the pulse High and Low in one cycle) is changed according to the voltage.
  • the power increases as the voltage increases, and the maximum power is obtained at the voltage (Vop).
  • the PV characteristic of the output power from the DC-DC converter 34 is configured such that the maximum power point can be changed by the control from the charge / discharge control unit 5.
  • a diode (not shown) is provided between the power output unit 4 and the DC-DC converter 34 to prevent a current from flowing backward toward the DC-DC converter 34.
  • a generated power detection unit 7 that detects the generated power of the power generation device 2 is provided. Based on the detection result of the generated power detection unit 7, the charge / discharge control unit 5 can acquire the generated power of the power generation device 2 at predetermined detection time intervals (for example, 30 seconds or less). For example, the charge / discharge control unit 5 acquires the generated power data of the power generation device 2 every 30 seconds.
  • the generated power detection time interval needs to be set to an appropriate value in consideration of the fluctuation cycle of the generated power of the power generator 2 and the like.
  • the detection time interval is set to be shorter than the lower limit cycle of the fluctuation cycle that can be handled by the load frequency control (LFC).
  • the charge / discharge control unit 5 acquires the output power of the power output unit 4 to recognize the difference between the power actually output from the power output unit 4 to the power system 50 and the generated power of the power generation device 2.
  • the charge / discharge of the charge / discharge unit 32 can be feedback controlled.
  • the storage battery 31 is charged once instead of outputting the generated power of the power generation device 2 to the power system 50 as it is.
  • the charge / discharge control unit 5 is configured to preset output power from the storage battery 31 and perform power smoothing control. Specifically, when the generated power of the power generation device 2 is larger than the preset output power (set output power), the storage battery 31 is charged with the power corresponding to the excess, and the generated power of the power generation device 2 Is smaller than the preset output power, control is performed so that the power corresponding to the shortage is supplemented from the storage battery 31.
  • the generated power of the power generator 2 is input / output to the storage battery 31 in small increments, the capacity of the storage battery 31 is reduced unlike the case of using the storage battery 31 for the purpose of peak cutting of power as in the past. Is possible.
  • step S ⁇ b> 1 shown in FIG. 4 the generated power P ⁇ b> 1 of the power generation device 2 at a certain time is detected by the generated power detection unit 7 and taken into the charge / discharge control unit 5.
  • step S2 the generated power P1 of the power generator 2 is charged to the storage battery 31 via the DC bus 6a and the DC-DC converter 33.
  • the DC-DC converter 33 steps down the voltage supplied from the power generator 2 to the DC side bus 6a to a voltage suitable for charging the storage battery 31. That is, the generated power P ⁇ b> 1 generated in the power generation device 2 is not supplied to the power output unit 4 but is charged in the storage battery 31.
  • step S3 the preset set output power P2 is output from the storage battery 31 to the power output unit 4 via the DC-DC converter 34.
  • the DC-DC converter 34 boosts the voltage of the power supplied from the storage battery 31 to the DC side bus 6b to near the voltage of the DC side bus 6b.
  • the generated power P1 is similarly charged in the storage battery 31, and the set output power P2 is output to the power output unit 4.
  • the generated power P1 and the set output power P2 are equal, there is no change in the power charged in the storage battery 31.
  • the generated power P1 of the power generation device 2 varies from moment to moment due to the weather or the like, and the operations of Step S1 to Step S3 are repeated until the operation of the photovoltaic power generation system 1 is completed.
  • the solar power generation system 1 of the first embodiment can obtain the following effects by the above configuration.
  • the charge / discharge control unit 5 changes the power output from the DC-DC converter 34 to the power output unit 4 so that the power changes according to the voltage and has the peak power. Since the power output from the DC-DC converter 34 has a peak power, the power output unit 4 changes the voltage to follow the maximum power value ( MPPT) control can be performed appropriately. Thus, unlike the case where the power output from the DC-DC converter 34 does not have peak power and the power is constant even when the voltage is changed, the power output unit 4 can be prevented from malfunctioning. it can.
  • the power storage device 3 and the charge / discharge control unit 5 are added later to a grid-connected power generation system in which the power generation device 2 is connected to the power system 50 via the power output unit 4 and does not have the power storage device 3.
  • the power generation system according to the present invention can be easily configured.
  • the power output unit 4 is configured such that maximum power follow-up control is performed so that the power output from the DC-DC converter 34 is maximized, and charging / discharging is performed.
  • the control unit 5 causes the power output from the DC-DC converter 34 to the power output unit 4 so that the power output unit 4 can easily perform the maximum power tracking control.
  • the charge / discharge control unit 5 can easily perform the maximum power follow-up control by the power output unit 4 so that the output characteristic of the power output from the DC-DC converter 34 is improved. Therefore, the maximum power tracking control can be appropriately performed using the conventional power output unit 4 having the maximum power tracking control function.
  • the charge / discharge control unit 5 performs PWM control on the power output from the DC-DC converter 34 and is output from the DC-DC converter 34 to the power output unit 4.
  • the duty ratio of the pulse signal for power control High and Low of the pulse in one cycle
  • the power (current) output from the DC-DC converter 34 can be changed, so that the power output from the DC-DC converter 34 to the power output unit 4 can be easily changed.
  • the output can be controlled so that the power changes according to the voltage and the output characteristic has the peak power.
  • the direct current side bus 6b provided separately from the direct current side bus 6a. It is connected to the power output unit 4 and configured to output power from the DC-DC converter 34 to the power output unit 4 via the DC bus 6b, so that power can be supplied from the power generator 2 to the power storage device 3.
  • the charge / discharge control unit 5 is substantially symmetric with respect to the straight line through which the power output from the DC-DC converter 34 to the power output unit 4 passes the voltage corresponding to the peak power.
  • the power output from the DC-DC converter 34 is controlled by controlling the output power to have a proper output characteristic. Since the same operation is performed before and after the voltage corresponding to the peak power, the operation for controlling the power output from the DC-DC converter 34 can be easily performed.
  • the configuration of the solar power generation system 1a according to the second embodiment will be described with reference to FIG.
  • the DC side bus 6a charged with the power generated by the power generation device 2 and the DC side bus 6b discharged with the power output unit 4 are separated with the power storage device 3 interposed therebetween.
  • the power generation device 2 and the power output unit 4 are directly electrically connected by the DC side bus 6c.
  • Other parts are the same as those in the first embodiment.
  • the power generation device 2 and the power output unit 4 are directly electrically connected via the DC side bus 6c.
  • the storage battery 31 is connected in parallel to the DC side bus 6c. Between the power generation device 2 and the storage battery 31, the voltage supplied from the power generation device 2 to the DC side bus 6 c is stepped down to a voltage suitable for charging the storage battery 31, whereby the storage battery is connected from the DC side bus 6 c side.
  • a DC-DC converter 33a having a function of supplying power to the 31 side is provided.
  • a DC-DC converter 34a having a function of discharging electric power is provided on the bus 6c side.
  • the DC-DC converters 33a and 34a are examples of the “charge power conversion unit” and the “discharge power conversion unit” of the present invention, respectively.
  • the DC-DC converter 33a adjusts the power input to the DC-DC converter 33a so as to change according to the voltage and to have a peak power characteristic (see FIG. 13).
  • the input characteristic (PV characteristic) of the electric power input to the DC-DC converter 33a is a PV characteristic approximate to the output characteristic (see FIG. 12) of the electric power generated by the power generator 2. That is, the power gradually increases with the voltage, and the power suddenly decreases with the voltage after the voltage at which the output power becomes maximum.
  • the DC-DC converter 34a also changes the power output from the DC-DC converter 34a to the power output unit 4 according to the voltage and has a PV characteristic having peak power. It is adjusted so that it may become (refer FIG. 18). As a result, the power output unit 4 can easily perform MPPT control.
  • step S ⁇ b> 11 shown in FIG. 8 the generated power P ⁇ b> 1 of the power generation device 2 at a certain time is detected by the generated power detection unit 7 and taken into the charge / discharge control unit 5.
  • the charge / discharge control unit 5 calculates the target output power P2 by the moving average method using the average value of the 40 generated power data included in the past 20 minutes.
  • the moving average method is a calculation method in which the target output power at a certain point in time is an average value of the generated power of the power generation device 2 in the past period from that point.
  • Past generated power data is sequentially stored in the memory 5a.
  • a period for acquiring generated power data used for calculation of target output power is referred to as a sampling period.
  • the sampling period is a range between the lower limit period T2 and the upper limit period T1 of the load fluctuation period corresponding to the load frequency control (LFC), particularly in the range from the second half (near the long period) to the period exceeding T1, which does not extend for a long time. It is preferable to do.
  • a specific value of the sampling period is, for example, a period of about 10 minutes or more and about 30 minutes or less in a power system having a “load fluctuation magnitude—fluctuation period” characteristic as shown in FIG.
  • the sampling period is about 20 minutes. In this case, since the charge / discharge control unit 5 acquires the generated power data of the power generator 2 approximately every 30 seconds, the average value of the 40 generated power data included in the past 20 minutes is calculated as the target output power. is doing.
  • the target output power is calculated from the generated power of the past power generator 2, and the discharge of the storage battery 31 is controlled so that the discharge amount of the storage battery 31 becomes the target output power.
  • Charge / discharge control which is control for outputting electric power to the electric power system 50, is performed. That is, as shown in FIG. 10, when the generated power of the power generation device 2 is larger than the target output power, the charge / discharge control unit 5 charges the storage battery 31 with the power corresponding to the excess amount and reduces the shortage amount.
  • it is configured to suppress adverse effects on the power system 50 due to fluctuations in the generated power of the power generation device 2 due to the presence or absence of clouds or the like.
  • step S13 it is determined whether or not the generated power P1 of the power generator 2 is larger than the target output power P2.
  • the process proceeds to step S14, and the power corresponding to the target output power P2 as shown in FIG. Is output from the power generator 2 to the power output unit 4 via the DC bus 6c. Further, the process proceeds to step S15, and the storage battery 31 is charged with the power (P1-P2) corresponding to the difference between the generated power P1 of the power generator 2 and the target output power P2 via the DC-DC converter 33a.
  • the power generated by the power generation device 2 has a PV characteristic in which the power changes according to the voltage and has peak power, as shown in FIG.
  • the electric power input from the electric power generating apparatus 2 is PWM-controlled, and as shown in FIG. 13, the characteristic approximated to the output characteristic of the electric power generated by the electric power generating apparatus 2 (the electric power changes according to the voltage). And a characteristic having a peak power).
  • the PV characteristic the characteristic obtained by subtracting the PV characteristic shown in FIG. 13 from the PV characteristic shown in FIG. 12
  • the PV characteristic approximated to the output characteristic of the power generated by the power generation device 2 is obtained.
  • the shape of the PV characteristic also changes depending on the weather as shown by the solid line, the dotted line, and the one-dot chain line in FIG.
  • the DC-DC converter according to the comparative example is configured such that the power input to the DC-DC converter is substantially constant regardless of the voltage.
  • the PV characteristics as shown in FIG. 16 are obtained. That is, there is a region where the power is negative in the region where the voltage is low and the region where the voltage is high. In a region where the voltage is high, there is a region where the power is negative and the voltage is almost constant regardless of the voltage. In a region where the electric power is substantially constant regardless of the voltage, it becomes difficult for the power output unit 4 to find a point where the electric power is maximum, and malfunction may occur.
  • step S16 the generated power P1 of the power generator 2 and the target output power P2 are equal. It is determined whether or not. If it is determined in step S16 that the generated power P1 of the power generator 2 and the target output power P2 are not equal (that is, the generated power P1 of the power generator 2 is smaller than the target output power P2), step S16 is performed. Proceeding to S17, as shown in FIG. 17, all the generated power P1 of the power generator 2 is output to the power output unit 4 via the DC side bus 6c.
  • step S18 the process proceeds to step S18, and the power (P2-P1) corresponding to the difference between the target output power P2 and the generated power P1 of the power generator 2 is discharged to the power output unit 4 via the DC-DC converter 34a.
  • the electric power discharged from the storage battery 31 is a PV characteristic approximating the electric power generated by the power generation device 2 (PV having a peak electric power as the electric power changes depending on the voltage).
  • the DC-DC converter 34a As a result, the PV characteristics when the power output from the power generator 2 to the power output section 4 and the power discharged from the storage battery 31 to the power output section 4 are combined (the PV characteristics shown in FIG. 12).
  • the characteristic obtained by adding up the PV characteristics shown in FIG. 18 has a peak power as the power changes according to the voltage.
  • the electric power generated by the power generation apparatus 2 changes from moment to moment depending on the weather and the like, and the shape of the PV characteristic of the electric power output from the storage battery 31 to the electric power output unit 4 is also shown by the solid line, dotted line, As shown by the one-dot chain line, it varies depending on the weather. As a result, as shown in FIG. 19, the combined power of the power generated by the power generation device 2 and the power discharged from the storage battery 31 is also changed according to the weather and output.
  • the DC-DC converter according to the comparative example is configured such that the power discharged from the DC-DC converter to the power output unit is substantially constant regardless of the voltage.
  • the PV characteristics as shown in FIG. 21 are obtained.
  • the region where the voltage is high there is a region where the power is almost constant regardless of the voltage.
  • the power output unit 4 it becomes difficult for the power output unit 4 to find a point where the electric power is maximum, and malfunction may occur.
  • the electrical storage apparatus 3 is connected to the direct current
  • the unit 5 to control the power output from the DC-DC converter 34a to the power output unit 4 so as to have an output characteristic approximate to the output characteristic of the power generated by the power generation device 2, Since the output characteristics of the power generated by the power generated by the power generator 2 and the power discharged from the DC-DC converter 34a approximate the output characteristics of the power generated by the power generator 2, the maximum power A conventional power output unit 4 having a tracking control function can be used.
  • the solar power generation system 1a of the second embodiment can obtain the following effects by the above configuration.
  • the charge / discharge control unit 5 performs PWM control of the DC-DC converter 33a, even when the power charged in the power storage device 3 is subtracted from the power generated by the power generation device 2, the power output unit Since the output characteristic of the power output to 4 approximates the output characteristic of the power generated by the power generator 2, the conventional power output unit 4 having the maximum power tracking control function can be used.
  • the power input to the DC-DC converter 33a ( Current) can be controlled such that the power changes according to the voltage and the input characteristic has a peak power.
  • the present invention is not limited to this, and a voltage other than 48V may be used.
  • the present invention is not limited to the specific values such as the sampling period and the bus voltage described in the above embodiment, and can be appropriately changed.
  • the output characteristic of the power input to the DC-DC converter is adjusted by changing the duty ratio of the power input to the DC-DC converter.
  • the present invention is not limited to this, and the output characteristics of the power input to the DC-DC converter may be adjusted by a method other than the method of changing the duty ratio of the power.
  • the input characteristics of the power input to the DC-DC converter may be adjusted by providing a resistor in the DC-DC converter and adjusting the magnitude of the current input to the DC-DC converter.
  • the PV characteristics of the power input to the DC-DC converter 34 are substantially symmetrical with respect to a straight line passing through the voltage (Vop) at which the output power is maximized (see FIG. 3).
  • the present invention is not limited to this example, and the PV characteristics of the power input to the DC-DC converter 34 are represented by the P ⁇ of the power generated by the power generator.
  • the PV characteristic may be approximated to the V characteristic (see FIG. 12).

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  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un système de charge/décharge comprenant les éléments suivants: une batterie de stockage afin de stocker l'électricité générée par un générateur électrique, une unité de conversion électrique de décharge, afin de convertir l'électricité, qui se décharge de l'électricité stockée, une unité de sortie d'électricité afin d'émettre l'électricité fournie par l'unité de conversion électrique de décharge vers le système électrique, et une unité de commande afin de commander l'électricité qui est émise de l'unité de conversion électrique de décharge vers l'unité de sortie électrique de sorte que la puissance change en fonction de la tension et que les caractéristiques de sortie aient un pic de puissance.
PCT/JP2011/057359 2010-03-26 2011-03-25 Système de charge/décharge WO2011118771A1 (fr)

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JP2010073045 2010-03-26
JP2010-073045 2010-03-26

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WO2011118771A1 true WO2011118771A1 (fr) 2011-09-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITSP20130001A1 (it) * 2013-04-23 2014-10-24 Dario Ottolini Apparato elettronico di potenza in corrente continua che controlla e gestisce in maniera intelligente la potenza di un impianto fotovoltaico di tipo connesso alla rete elettrica pubblica utilizzando la carica e la scarica di un gruppo di batterie ele
EP2822143A4 (fr) * 2012-03-02 2015-12-30 Jgc Corp Dispositif d'alimentation, dispositif de stockage d'électricité, et système de stockage d'électricité

Citations (2)

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