WO2023176115A1 - 直流電源システム - Google Patents

直流電源システム Download PDF

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Publication number
WO2023176115A1
WO2023176115A1 PCT/JP2023/000683 JP2023000683W WO2023176115A1 WO 2023176115 A1 WO2023176115 A1 WO 2023176115A1 JP 2023000683 W JP2023000683 W JP 2023000683W WO 2023176115 A1 WO2023176115 A1 WO 2023176115A1
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WO
WIPO (PCT)
Prior art keywords
power
voltage
rectifier
power generation
solar
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2023/000683
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English (en)
French (fr)
Japanese (ja)
Inventor
祐喜 中村
友樹 龍野
和彦 竹野
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NTT Docomo Inc
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NTT Docomo Inc
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Priority to US18/836,088 priority Critical patent/US12470069B2/en
Priority to JP2024507531A priority patent/JPWO2023176115A1/ja
Publication of WO2023176115A1 publication Critical patent/WO2023176115A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging 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—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/933—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2101/00—Supply or distribution of decentralised, dispersed or local electric power generation
    • H02J2101/20—Dispersed power generation using renewable energy sources
    • H02J2101/22—Solar energy
    • H02J2101/24—Photovoltaics

Definitions

  • the present invention relates to a DC power supply system that utilizes solar power generation.
  • Patent Document 1 describes a control device for a solar power generation device that can control the solar power generation device to achieve maximum power using simple calculations. Patent Document 1 describes that the control device determines the operating voltage at which the electric power is maximized by changing the operating voltage of the solar power generation device stepwise from the lower limit to the upper limit of the operable range of the power conversion device. There is.
  • the AC power source of the commercial power system is converted to DC approximately 48V by a rectifier, and connected to the storage battery and communication equipment via DC.
  • a system power supply 48V DC
  • a storage battery a storage battery
  • solar power generation control is required to efficiently operate these three power sources.
  • an object of the present invention is to provide a DC power supply system that can maximize solar power generation by taking into consideration the operating state of the load device to which power is supplied. shall be.
  • the DC power supply system of the present invention is connected to commercial power and includes a rectifier that supplies power to a load device, and a solar power generator that supplies power to the load device. a power consumption acquisition unit that acquires the power consumption of the load device; an output power acquisition unit that acquires the output power from the rectifier; and a power consumption acquisition unit that acquires the power consumption of the load device; and a voltage control unit that controls the rectifier voltage of the rectifier so as to increase the power generated by the solar power generation.
  • FIG. 1 is a configuration diagram of a rectifier 100 according to embodiments 1 and 2 of the present disclosure.
  • FIG. FIG. 3 is a diagram showing an example of IV characteristics of solar power generation.
  • FIG. 3 is a configuration diagram showing the configuration of a control unit according to the first embodiment.
  • 5 is a flowchart for explaining the operation of the control unit according to the first embodiment.
  • FIG. 3 is a diagram illustrating an example of changes in power consumption of a communication device due to sleep control.
  • FIG. 3 is a configuration diagram showing the configuration of a control unit according to a second embodiment. 7 is a flowchart for explaining the operation of the control unit according to the second embodiment.
  • FIG. 2 is a diagram illustrating an example of a hardware configuration of a control unit 102 of a DC power supply system according to an embodiment of the disclosure.
  • FIG. 1 is a diagram showing a system configuration of a DC power supply system 1 according to the present disclosure.
  • communication device 300 is a load device, and power is supplied to communication device 300 from commercial power 500, solar power generation device 200, and storage battery 400.
  • the rectifier 100 is a device that converts alternating current from commercial power 500, which is an alternating current power source, into direct current.
  • the solar power generation device 200 is directly connected to a 48V bus, and the power generated by the solar power generation device 200 is preferentially supplied to the communication device 300, which is a load.
  • the solar power generation device 200 operates with the rectifier voltage of the rectifier 100.
  • FIG. 2 is a block diagram showing the functional configuration of the rectifier 100.
  • the rectifier 100 includes a rectification/voltage adjustment section 101, a control section 102, a current sensor 103, and a voltage sensor 104.
  • the rectifier 100 supplies power to the communication device 300 while floatingly charging the storage battery 400 by directly connecting the solar power generation device 200 and the 48V bus. Furthermore, at the same time, the solar power generation device 200 feeds the generated power to the communication device 300 preferentially.
  • the rectification/voltage adjustment unit 101 is a part that adjusts the output voltage (rectifier voltage) of the rectifier 100.
  • the control unit 102 is a part that acquires information (for example, traffic volume) indicating the operating state of the communication device 300 and controls the rectification/voltage adjustment unit 101 based on the information.
  • information for example, traffic volume
  • the current sensor 103 and the voltage sensor 104 are sensors that detect the current and voltage inside the rectifier 100 adjusted by the rectification/voltage adjustment section 101, respectively.
  • the rectification/voltage adjustment unit 101 adjusts the output voltage under the control of the control unit 102, and sets the output voltage as the optimum operating voltage of the solar power generation device 200. Thereby, it is possible to maximize the output power of the solar power generation device 200, which varies depending on the amount of solar radiation and the like.
  • the power consumption W of the communication device 300 has a power value according to the amount of traffic. Therefore, in order to maximize the generated power P of the solar power generation device 200, the control unit 102 adjusts the rectifier of the rectifier 100 based on the power consumption W of the communication device 300 estimated based on the traffic amount data acquired from the communication device 300. It is necessary to maximize the value obtained by subtracting the output power P' (positive in the direction toward the communication device 300, negative in the direction toward the storage battery 400).
  • control unit 102 controls the rectifier voltage so that the value obtained by subtracting the output power of the rectifier 100 from the power consumption of the communication device 300 becomes the maximum.
  • a current sensor 103 and a voltage sensor 104 inside the rectifier 100 measure the current and voltage.
  • Control unit 102 derives rectifier output power P' based on the current and voltage. This makes it possible to check the increase or decrease in the rectifier output power when changing the rectifier voltage.
  • FIG. 3 is a diagram showing the relationship (optimum operating point) between the amount of solar radiation and the rectifier voltage/current. As shown in the figure, the relationship between voltage and current changes depending on the amount of solar radiation. The optimal operating point indicates the point (combination of voltage and current) at which the power generated by solar power generation is maximum. In the present disclosure, it is assumed that the rectifier voltage is 50 V, the solar radiation is 200 W/m 2 , and there is no change in the power consumption of the communication device 300, for example.
  • the power generated by the solar power generation device 200 will increase. If the power generated by the solar power generation device 200 increases, the rectifier output power decreases, so the rectifier voltage is directly increased by 0.1V. When the voltage is 50.1V, increase the voltage by 0.1V in the same way. If this operation is repeated, the rectifier voltage will eventually rise to a voltage that exceeds the optimal operating voltage of the solar power generation device 200 (see the optimal operating point in FIG. 3). At this time, if the rectifier voltage is increased by 0.1V, the power generated by the solar power generation device 200 will decrease.
  • the rectifier output power increases, so the rectifier voltage is controlled not to be raised by 0.1V but to be lowered by 0.1V.
  • the rectifier output power can be kept at a minimum and the output power of the solar power generation device 200 can be kept at a maximum.
  • FIG. 4 is a block diagram showing the functional configuration of the control unit 102.
  • the control unit 102 includes a traffic amount acquisition unit 102a, a power calculation unit 102b, a data storage unit 102c, a power comparison unit 102d, a sign inversion unit 102e, a search operating voltage determination unit 102f, and a voltage control command unit 102g. It is composed of:
  • the traffic amount acquisition unit 102a is communicably connected to the communication device 300, and is a part that acquires the traffic amount of data that the communication device 300 is transmitting and receiving. This traffic amount is a predetermined traffic amount per unit time.
  • the power calculation unit 102b is a part that calculates the power of the communication device 300 and the power output from the rectifier 100 according to the amount of traffic. Generally, the more traffic the communication device 300 is communicating, the more power it consumes. The power calculation unit 102b calculates the amount of power according to the amount of traffic using a predetermined calculation formula or a correspondence table.
  • the data storage unit 102c is a part that stores the generated power P calculated by the power calculation unit 102b.
  • the data storage unit 102c stores the generated power P calculated by the power calculation unit 102b together with the calculation time.
  • the power comparison unit 102d is a part that compares the generated power P calculated by the power calculation unit 102b and the generated power P_ one time ago, which is stored in the data storage unit 102c.
  • the power comparison unit 102d calculates the generated power P ⁇ generated power P_ to determine the difference dP, and determines the sign of the difference dP. That is, it is determined whether the difference dP is less than 0 or greater than 0.
  • the sign inverting unit 102e is a part that inverts the sign of the search voltage dV based on the comparison result. That is, the sign inverter 102e inverts the sign of the search voltage dV when dP is less than 0.
  • the search operating voltage determination unit 102f is a part that determines a search operating voltage corresponding to the rectifier voltage of the rectifier 100.
  • FIG. 5 is a flowchart showing the operation of the control unit 102.
  • Voltage V 0 is the initial rectifier voltage of rectifier 100 and dV is the search voltage.
  • the rectifier voltage that maximizes the power of solar power generation is searched for by adding or subtracting according to the sign of the search voltage dV.
  • the power calculation unit 102b calculates the power consumption W of the communication device 300 from the amount of traffic that the communication device 300 is communicating (S102).
  • the data storage unit 102c stores this power consumption W.
  • the power calculation unit 102b obtains the rectifier output power P' based on the rectifier voltage V (S103). Further, the power calculation unit 102b calculates the generated power P of solar power generation (S104). The generated power P of solar power generation is determined by power consumption W - rectifier output power P'.
  • the power comparison unit 102d calculates the difference dP by calculating the solar power generation power P ⁇ the solar power generation power P_ (P_ is the power one hour ago) (S105). Here, it is determined whether the difference dP>0 (S106). Here, if the difference dP>0, the sign inverter 102e does not change the sign of the search voltage dV and sets the initial voltage V 0 to the rectifier voltage V. Further, if the difference dP>0 is not satisfied, the sign inverting unit 102e inverts the sign of the search voltage dV (S107), and the search operating voltage determining unit 102f changes the rectifier voltage V obtained in step S101 to the initial voltage V It is set to 0 (S108).
  • the search operating voltage determining unit 102f determines the rectifier voltage (search operating voltage) of the rectifier 100 by adding the search voltage dV that has been subjected to sign processing (sign inversion processing as necessary). decide.
  • the voltage control command section 102g sends the determined rectifier voltage to the rectification/voltage adjustment section 101, and causes the rectification/voltage adjustment section 101 to perform an operation based on the voltage.
  • the rectifier voltage can be adjusted to maximize the solar power generation.
  • a DC power supply system 1 of the present disclosure is a system that is connected to commercial power 500 and includes a rectifier 100 that supplies power to a communication device 300 that is a load device, and a solar power generation device 200 that supplies power to the communication device 300. .
  • the traffic amount acquisition section 102a acquires the operating state (traffic amount) of the communication device 300
  • the power calculation section 102b functions as a power consumption acquisition section and calculates the operation state of the communication device 300 according to the traffic amount. Get the power consumption of. Further, the power calculation unit 102b acquires the output power from the rectifier 100.
  • the power comparison unit 102d functions as a solar power generation power acquisition unit, and acquires the generated power of the solar power generation device 200 based on the power consumption W of the communication device 300 and the rectifier output power P′ of the rectifier 100.
  • the search operating voltage determining section 102f functions as a voltage control section together with the power comparing section 102d and the sign inverting section 102e, and adjusts the search voltage dv determined by the sign inverting section 102e so as to increase the power generated by the solar power generation device 200.
  • the sign is used to determine the rectifier voltage of rectifier 100.
  • the power comparison unit 102d sets the value obtained by subtracting the output power P' of the rectifier 100 from the power consumption W of the communication device 300 as the generated power P of solar power generation. Then, the search operating voltage determining unit 102f determines the rectifier voltage of the rectifier 100 so as to maximize the power generated by the solar power generation device 200.
  • the power generated by the solar power generation device 200 can be maximized while taking into account the operation of the communication device 300.
  • Each frequency band of the device may be turned on or off, and its power consumption fluctuates. Therefore, it is difficult to always maximize solar power generation.
  • the rectifier voltage can be controlled according to the operating state of the communication device 300 in this way, and the power generated by the solar power generation device 200 can be appropriately maximized.
  • the power comparison unit 102d which is a function of the voltage control unit, determines the fluctuation of the solar power generation device 200, and the search operating voltage determination unit 102f determines the rectifier voltage V of the rectifier 100 based on the fluctuation. increase or decrease.
  • the power comparison unit 102d can determine the fluctuation by comparing the current power generation P of the solar power generation device 200 with the power generation P_ one hour ago. Then, the sign inverting section 102e inverts the sign based on the variation, and the search operating voltage determining section 102f can determine the rectifier voltage.
  • the load device is the communication device 300.
  • the operating state is based on the amount of data traffic that communication device 300 is communicating.
  • the load device is not limited to the communication device 300. Any device that can be powered externally may be used.
  • looking at the amount of traffic is just one example of determining the operating state, and it is also possible to directly look at the operating state of the CPU.
  • Power control that effectively utilizes the rectifier 100 according to Embodiment 1 of the present disclosure is performed by maintaining the value obtained by subtracting the output power P' of the rectifier 100 from the power consumption W of the communication device 300 to the maximum. Power can be supplied to the communication device 300 while maintaining the output power at the maximum and floating charging the storage battery 400 (charging surplus power generation depending on the situation).
  • charging/discharging is performed, such as discharging when the amount of traffic exceeds the average power consumption (e.g. 6W) and charging when the amount of traffic falls below the average power consumption.
  • the average power consumption e.g. 6W
  • Through control it is possible to suppress the power demand value and reduce electricity charges using commercial power 500.
  • a process for appropriately charging the storage battery 400 while maximizing the power generated by the solar power generation device 200 will be described.
  • FIG. 7 is a block diagram showing the functional configuration of the control unit 102 included in the rectifier 100 of the present disclosure.
  • the control unit 102 includes a traffic amount acquisition unit 102a, a power calculation unit 102b, a data storage unit 102c, a power comparison unit 102d, a sign inversion unit 102e, a search operating voltage determination unit 102f, and a voltage control command unit 102g.
  • it further includes a charge/discharge control determining section 102h, a domain determining section 102i, a voltage calculating section 102j, and a domain comparing section 102k.
  • the charging/discharging control determining unit 102h is a unit that determines whether to charge the storage battery 400 or discharge the storage battery 400 based on the traffic volume of the communication device 300 acquired by the traffic volume acquisition unit 102a.
  • the charge/discharge control determining unit 102h determines whether to charge the storage battery 400 or discharge the storage battery 400 based on the average power consumption calculated in advance.
  • the charging/discharging control determining unit 102h holds the average power consumption in advance, and determines whether to charge or discharge based on the average power consumption. Note that, as shown in FIG. 6, charging and discharging may be defined for each time period, and the charging and discharging control determination unit 102h may determine charging or discharging according to the time.
  • the domain determination unit 102i has a management table that associates the voltage for charging (charging voltage) or the voltage for discharging (discharging voltage) for each SOC (state of charge) of the storage battery 400. This is the part that determines the rectifier voltage of the rectifier 100 based on the management table. For example, when the charging/discharging control determining unit 102h determines that the storage battery 400 is to be charged, the domain determination unit 102i acquires the SOC of the storage battery 400, and acquires the voltage associated with the SOC.
  • the voltage calculation unit 102j is a part that replaces the rectifier voltage V with the initial voltage V0 .
  • the domain comparison section 102k is a section that compares the rectifier voltage V calculated by the voltage calculation section 102j and the voltage (defined domain) determined by the domain determination section 102i.
  • the domain comparison unit 102k determines the sign of the search voltage dV according to the comparison result. For example, when the voltage of the voltage calculation unit 102j is higher than the voltage determined by the domain determination unit 102i, the domain comparison unit 102k sets the sign of the search voltage dV to a negative value in order to control the voltage to be lowered. . When the voltage of the voltage calculation unit 102j is lower than the voltage determined by the domain determination unit 102i, the domain comparison unit 102k sets the sign of the search voltage dV to be positive in order to control the voltage to be increased.
  • the search operating voltage determination unit 102f is a part that determines a search operating voltage corresponding to the rectifier voltage of the rectifier 100.
  • FIG. 8 is a flowchart showing the operation.
  • the control to maximize the photovoltaic power generated from processing S101 to processing S107 is the same as that in FIG. 5. That is, the control unit 102 calculates the generated power P of solar power generation based on the rectifier voltage V obtained by adding the search voltage dV to the initial voltage V0, the power consumption W of the communication device 300, and the rectifier output power P′. .
  • the control unit 102 determines an increase or decrease in the generated power P of the solar power generation, and determines the sign of the search voltage dV based on the increase or decrease.
  • the charge/discharge control determining unit 102h first determines whether to charge the storage battery 400, discharge the storage battery 400, or do nothing (S100a). Then, the domain determination unit 102i determines the domain based on the SOC of the storage battery 400 (S100b). This domain is information indicating the range of discharge voltage in the case of discharging, and the range of discharge voltage in the case of charging.
  • control unit 102 determines the rectifier voltage V so that the solar power generation is maximized within the range shown by this definition area (S101 to S107).
  • the sign of dV is set to negative, but there is also a case where the sign of the most recent dV is reversed (set to positive).
  • the charging/discharging control determining unit 102h determines the charging/discharging determination timing (S100c), and when the determination timing has been reached, the process returns to step S100a. If the determination timing has not been reached, the process advances to step S100d.
  • this judgment timing is determined according to the time zone shown in FIG. 6 (for example, judgment is made at 0 minutes of every hour), it does not have to be based on this. It may be determined based on the traffic amount of the communication device 300.
  • the voltage calculation unit 102j sets the voltage V to the voltage V0 (S108), and the domain comparison unit 102k compares the voltage V0 derived by the voltage calculation unit 102j with the domain determined by the domain determination unit 102i. Then, it is determined whether the voltage V 0 satisfies the defined range. Here, if it is determined that there is a discharge in process S100b, and if the voltage V0 is less than the discharge voltage defined in the domain (satisfies the domain), nothing is done and the sign of dV determined in process S107 is changed. adopt.
  • the sign of the search voltage dV is set to negative, and the rectifier voltage V is controlled in the direction of decreasing. In this case, the sign of the search voltage dV determined in step S107 is not adopted.
  • step S107 In the case of charging, nothing is done when the voltage V 0 is equal to or higher than the charging voltage (satisfying the defined range).
  • the reference numeral of process S107 is adopted.
  • the search voltage dV is made positive and the rectifier voltage V is controlled to increase. In this case, the sign of dV determined in step S107 is not adopted.
  • process S107 and process S100d the premise is that the rectifier voltage V is gradually increased. As shown in FIG. 3, the power increases gradually. On the other hand, after the optimum operating point is exceeded, increasing the voltage will cause the power to decrease. Therefore, in processing S107 and processing S100d, when controlling a voltage that exceeds the optimum operating point, if the voltage is adjusted in the direction of lowering, the power is controlled in the direction of increasing.
  • the rectifier voltage is limited to a voltage higher than (or lower than) required for charging (or discharging) based on the charging/discharging characteristics of the storage battery 400, and The output power of the power generation device 200 is controlled to be kept at the maximum. Since the charging and discharging voltage of the storage battery 400 is uniquely determined according to the SOC (battery capacity) of the storage battery, the control unit 102 can control the charging and discharging of the storage battery 400 by acquiring real-time SOC data.
  • the rectifier voltage that maximizes the power generated by the solar power generation device 200 is 52V
  • the discharge voltage of the storage battery is 51V. do.
  • the rectifier voltage at which the power generated by the solar power generation device 200 is maximized is generally adjusted to 51V before reaching 52V.
  • the rectifier voltage of the rectifier 100 that maximizes the power generated by the solar power generation device 200 is 52V
  • the charging voltage of the storage battery 400 is 53V.
  • the rectifier voltage at which the power generated by the solar power generation device 200 reaches the maximum reaches 52V, and thereafter, dV is repeatedly added up to 53V without being adjusted to 52V.
  • the rectifier voltage is increased in the direction that maximizes the photovoltaic power, and the sign of dV is adjusted to adjust the rectifier voltage.
  • the rectifier voltage only needs to be equal to or higher than the voltage defined in the domain, so as a result, the sign remains in the positive direction. That is, even if the sign is reversed and becomes negative in step S107, the sign may be changed to positive in step S107.
  • the DC power supply system 1 of the present disclosure further includes a storage battery 400 that is chargeably connected to the solar power generation device 200 and the commercial power 500 and that can supply power to the load device.
  • a storage battery 400 that is chargeably connected to the solar power generation device 200 and the commercial power 500 and that can supply power to the load device.
  • the power generated by the solar power generation device 200 can be used without waste.
  • the charge/discharge control determining unit 102h discharges the storage battery 400 and supplies power to the communication device 300 based on the relationship between the power generated by the solar power generation device 200 and the power consumption in the communication device 300. It is determined whether to charge the storage battery 400 with the power generated by the solar power generation device 200.
  • the domain determination unit 102i, the domain comparison unit 102k, and the search operating voltage determination unit 102f determine the rectifier voltage of the rectifier 100 based on their judgments.
  • the relationship between the generated power and the consumed power indicates, for example, which one is larger by comparing the past average values of the generated power and the consumed power at a predetermined timing, and when the generated power is large, the storage battery 400 is charged. Make decisions such as:
  • the average value of power consumption and the magnitude relationship with power generation are classified by time period, and discharge/charging is determined based on the classification. You may.
  • the solar power generation device 200 is generating surplus power.
  • the domain determination unit 102i determines a domain of voltage for charging and discharging that is determined according to the SOC of the storage battery 400. Then, the domain comparison unit 102k controls the rectifier voltage based on the domain.
  • the SOC is used to charge and discharge the storage battery 400 by controlling the rectifier voltage. This makes it possible to control charging and discharging with simple control.
  • Embodiment 2 of the present disclosure a definition range is defined and the solar power generation power is controlled to be maximized within that range; however, the rectifier voltage V that maximizes the solar power generation power is not limited to this. From there, the rectifier voltage V may be adjusted to lower it so that it falls within the defined range.
  • an inverter device with an MPPT (maximum power point tracking) function is provided to convert the AC to the AC input immediately before inputting the communication device 300. Also good. In this case, control is performed to keep the output power of the solar power generation device 200 at the maximum. Moreover, it may be used when the rectifier 100 is not provided. Specifically, by connecting commercial power 500 to the inverter device and adjusting the input voltage of the inverter to the charging voltage or discharging voltage, arbitrary charging and discharging can be performed, and the amount of power generation or storage can be reduced. When there is no power available, power can be supplied to the communication device 300 from the commercial power 500. At this time, if there is no commercial power 500, self-sustaining operation may be performed.
  • MPPT maximum power point tracking
  • the DC power supply system according to the above embodiment may be used not only for the communication device 300 but also for other load devices that can receive power supply.
  • the power control for solar power generation that effectively utilizes the rectifier 100 includes a current sensor 103 and a voltage sensor 104 inside the rectifier 100, but these are installed outside the rectifier 100. You may. For example, if a current sensor that measures the output current of the solar power generation device 200 is provided, the power generated by the solar power generation device 200 can be measured, so the voltage of the rectifier 100 can be adjusted to maximize the power generated by the solar power generation. It is also possible to control.
  • each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices.
  • the functional block may be realized by combining software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't do it.
  • a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.
  • control unit 102 in the rectifier 100 in an embodiment of the present disclosure may function as a computer that performs processing of the DC power processing method of the present disclosure.
  • FIG. 9 is a diagram illustrating an example of the hardware configuration of the control unit 102 of the DC power supply system according to an embodiment of the present disclosure.
  • This control unit 102 may be physically configured as a computer device including a processor 1001, a memory 1002, a bus 1007, and the like.
  • control unit 102 can be read as a circuit, a device, a unit, etc.
  • the hardware configuration of the control unit 102 may include one or more of the devices shown in the figure, or may not include some of the devices.
  • Each function in the control unit 102 causes the processor 1001 to perform calculations and at least read or write data in the memory 1002 by loading predetermined software (programs) onto hardware such as the processor 1001 and the memory 1002. This is achieved through control.
  • the processor 1001 for example, operates an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like.
  • CPU central processing unit
  • the above-described power calculation unit 102b and the like may be realized by the processor 1001.
  • the processor 1001 reads programs (program codes), software modules, data, etc. into the memory 1002, and executes various processes in accordance with these.
  • programs program codes
  • the control unit 102 may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may be similarly realized.
  • Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.
  • the memory 1002 is a computer-readable recording medium, and includes at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be done.
  • Memory 1002 may be called a register, cache, main memory, or the like.
  • the memory 1002 can store executable programs (program codes), software modules, and the like to implement the solar power generation control method according to an embodiment of the present disclosure.
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured using a single bus, or may be configured using different buses for each device.
  • the control unit 102 also includes hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA).
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • FPGA field programmable gate array
  • the notification of information may include physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented using broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
  • RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
  • the input/output information may be stored in a specific location (for example, memory) or may be managed using a management table. Information etc. to be input/output may be overwritten, updated, or additionally written. The output information etc. may be deleted. The input information etc. may be transmitted to other devices.
  • Judgment may be made using a value expressed by 1 bit (0 or 1), a truth value (Boolean: true or false), or a comparison of numerical values (for example, a predetermined value). (comparison with a value).
  • notification of prescribed information is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.
  • Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.
  • software, instructions, information, etc. may be sent and received via a transmission medium.
  • a transmission medium For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create a website, When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of the foregoing. It may also be represented by a combination of
  • At least one of the channel and the symbol may be a signal.
  • the signal may be a message.
  • a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
  • radio resources may be indicated by an index.
  • determining may encompass a wide variety of operations.
  • “Judgment” and “decision” include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., a search in a table, database, or other data structure), and may include ascertaining something as a “judgment” or “decision.”
  • judgment and “decision” refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access.
  • (accessing) may include considering something as a “judgment” or “decision.”
  • judgment and “decision” refer to resolving, selecting, choosing, establishing, comparing, etc. as “judgment” and “decision”. may be included.
  • judgment and “decision” may include regarding some action as having been “judged” or “determined.”
  • judgment (decision) may be read as “assuming", “expecting", “considering”, etc.
  • connection means any connection or coupling, direct or indirect, between two or more elements and each other. It can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled.”
  • the bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be replaced with "access.”
  • two elements may include one or more wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges, and the like.
  • the phrase “based on” does not mean “based solely on” unless explicitly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • any reference to elements using the designations "first,” “second,” etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.
  • a and B are different may mean “A and B are different from each other.” Note that the term may also mean that "A and B are each different from C”. Terms such as “separate” and “coupled” may also be interpreted similarly to “different.”
  • SYMBOLS 1 DC power supply system, 300... Communication device, 500... Commercial power, 200... Solar power generation device, 400... Storage battery, 100... Rectifier, rectification/voltage adjustment part, 102... Control part, 103... Current sensor, 104... Voltage Sensor, 102a...Traffic amount acquisition section, 102b...Power calculation section, 102c...Data storage section, 102d...Power comparison section, 102e...Sign inversion section, 102f...Search operation voltage determination section, 102g...Voltage control command section, 102h... Charging/discharging control determining section, 102i... Domain determining section, 102j... Voltage calculating section, 102k... Defined domain comparing section.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
PCT/JP2023/000683 2022-03-14 2023-01-12 直流電源システム Ceased WO2023176115A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011172454A (ja) * 2010-02-22 2011-09-01 Kddi Corp 太陽光発電システムの整流器制御方式
JP2014042417A (ja) * 2012-08-23 2014-03-06 Ntt Docomo Inc 直流電源システム
JP2014157574A (ja) * 2013-02-18 2014-08-28 Ntt Docomo Inc 直流電源システム、整流器、整流器動作電圧決定方法、プログラム

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012221151A (ja) 2011-04-07 2012-11-12 Mitsubishi Electric Corp 太陽光発電装置の制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011172454A (ja) * 2010-02-22 2011-09-01 Kddi Corp 太陽光発電システムの整流器制御方式
JP2014042417A (ja) * 2012-08-23 2014-03-06 Ntt Docomo Inc 直流電源システム
JP2014157574A (ja) * 2013-02-18 2014-08-28 Ntt Docomo Inc 直流電源システム、整流器、整流器動作電圧決定方法、プログラム

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