WO2020166051A1 - Système d'alimentation en puissance à courant continu distribué - Google Patents

Système d'alimentation en puissance à courant continu distribué Download PDF

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Publication number
WO2020166051A1
WO2020166051A1 PCT/JP2019/005502 JP2019005502W WO2020166051A1 WO 2020166051 A1 WO2020166051 A1 WO 2020166051A1 JP 2019005502 W JP2019005502 W JP 2019005502W WO 2020166051 A1 WO2020166051 A1 WO 2020166051A1
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WO
WIPO (PCT)
Prior art keywords
power
beacon
node
nodes
bus
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PCT/JP2019/005502
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English (en)
Japanese (ja)
Inventor
久和 宇都
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Tdk株式会社
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Publication date
Application filed by Tdk株式会社 filed Critical Tdk株式会社
Priority to PCT/JP2019/005502 priority Critical patent/WO2020166051A1/fr
Publication of WO2020166051A1 publication Critical patent/WO2020166051A1/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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network

Definitions

  • the present invention relates to a distributed DC power supply system, and more particularly to a mechanism for mutually monitoring a plurality of nodes distributedly arranged on a DC grid.
  • a voltage change information acquisition unit that acquires information on a voltage change of each node connected to a DC bus line, and the node of each node acquired by the voltage change information acquisition unit
  • a route information generation unit that generates topology information of each of the nodes connected to the DC bus line based on voltage change information, and automatically collects connection configurations of nodes that transmit and receive DC power.
  • the energy management of each node is centrally performed by the power management device, and an abnormality has occurred in the power generator or storage battery.
  • the system may go down before notifying the administrator terminal, so notify the administrator of the failure. I can't.
  • an object of the present invention is to provide a distributed DC power supply system capable of detecting a node abnormality without using a dedicated monitoring device.
  • a distributed DC power supply system includes a plurality of nodes having a power generation function and a power storage function, and one or a plurality of DC buses to which the plurality of nodes are connected.
  • Each node manages a beacon transmission unit that periodically transmits a beacon including a unique identifier, a beacon reception unit that receives a beacon transmitted from another node, a monitoring target list of the node, and a beacon reception history.
  • a node management unit that adds the identifier to the monitoring target list when a beacon including an identifier not registered in the monitoring target list is received a first specified number of times within a first specified time, and the monitoring target list
  • a warning output unit that outputs a warning when the beacon including the identifier registered in is not received a second specified number of times within a second specified time.
  • the present invention since a plurality of nodes monitor each other, it is possible to detect a node abnormality quickly and reliably without using a dedicated monitoring device, and to improve system reliability at low cost and easily. Can be realized.
  • Each of the plurality of nodes is connected to the DC bus via the first to third DC/DC converters connected to the DC bus and the first DC/DC converter, and supplies generated power to the DC bus.
  • a natural energy power generation device a load device connected to the DC bus via the second DC/DC converter, and receiving a power supply from at least one of the natural energy power generation device and the storage battery, and the third DC/DC converter. Is connected to the DC bus via the DC power supply and charges the generated power when the generated power is larger than the load power, and discharges the generated power when the generated power is smaller than the load power to supply power to the load device.
  • a storage battery to do and a power management device that manages the entire node including the charging and discharging operation of the storage battery, the power management device, the beacon transmission unit, the beacon reception unit, the node database, the node management unit and the An alarm output unit is preferably included.
  • the power monitoring device in the node acts as a monitoring device and automatically monitors the surrounding nodes, so there is no need to change the parameters or restart the existing nodes, and manage them easily. You can
  • the beacon further includes information on at least one of a charging rate of the storage battery and a power generation amount of the natural energy power generation device.
  • the beacon can be used as a trigger signal when power is exchanged between the nodes, and power can be supplied from one node to the other node.
  • the cause can be investigated by using the information included in the beacon, and it can be inferred whether it is due to power shortage or a power management device failure. ..
  • the beacon is a one-way communication wireless signal.
  • the distributed DC power supply system it is necessary to reduce the standby power of the node as much as possible, and there is a concern that the power consumption will increase when mutual monitoring of the nodes is realized by bidirectional communication.
  • one-way communication as a communication method for mutual monitoring of nodes, it is possible to reduce power consumption as compared with bi-directional communication.
  • the beacon may be a two-way communication signal. For example, when one node sends a specific inquiry command by radio signal to the other node and receives a response command from the other node, it can be determined that the other node is operating normally. .. Thereby, the reliability of communication for mutual monitoring of nodes can be improved.
  • FIG. 1 is a schematic diagram showing the configuration of a distributed DC power supply system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram schematically showing the configuration of the node 2.
  • FIG. 3 is a block diagram schematically showing the configuration of the power management apparatus 60.
  • 4A to 4C are diagrams for explaining the mutual monitoring operation between a plurality of nodes.
  • FIG. 1 is a schematic diagram showing a configuration of a distributed DC power supply system according to an embodiment of the present invention.
  • the distributed DC power supply system 1 includes a plurality of nodes 2 that form a small-scale independent DC power supply system, and a DC bus 10 that connects the plurality of nodes 2 to each other.
  • the plurality of nodes 2 and the DC bus 10 form a DC grid (DC power transmission network).
  • Each node 2 has a power generation function and a power storage function, and can exchange power via the DC bus 10.
  • FIG. 2 is a block diagram schematically showing the configuration of the node 2.
  • the node 2 is connected to the DC bus 10 that is a bus for DC power supply, the DC/DC converters 21 to 23 connected to the DC bus 10, and the DC bus 10 via the DC/DC converter 21.
  • the power generation amount by the energy generator 30 is compared with the load power amount by the load device 40, the storage battery 50 is charged when the generated power amount exceeds the load power amount, and the storage battery is charged when the load power amount exceeds the generated power amount.
  • a power management device 60 that manages the entire system including the operations of the DC/DC converters 21 to 23 so that the battery 50 is discharged, and a management that is communicable with the power management device 60 via a communication network 70 such as the Internet.
  • the operator terminal 71 is provided.
  • the voltage of the DC bus 10 is, for example, a high voltage DC transmission line of 350 ⁇ 100V. Therefore, when connecting a device operating at a voltage lower than that to the DC bus 10, it is necessary to connect via a DC/DC converter.
  • the DC/DC converter 21 is a one-way DC/DC converter (step-up converter) that boosts the generated power of, for example, 240 V from the natural energy power generation device 30 to 350 V and supplies the boosted power to the DC bus 10
  • the DC/DC converter 22 is Is a one-way DC/DC converter (step-down converter) that steps down the power of 350 V on the DC bus 10 to 24 V and supplies it to the load device 40.
  • the DC/DC converter 23 is a bidirectional DC/DC converter that steps down the power on the DC bus 10 and supplies it to the storage battery 50, and steps up the power from the storage battery 50 and supplies it to the DC bus 10.
  • the DC/DC converters 21 to 23 have an ON/OFF command receiving function and a power amount adjustment command receiving function, and are configured to be communicable with the power management apparatus 60.
  • the natural energy power generation device 30 is, for example, a solar power generation device 30A or a wind power generation device 30B.
  • the photovoltaic power generation device 30A includes a photovoltaic power generation panel and a power conditioner, and is connected to the DC bus 10 via the DC/DC converter 21A.
  • the wind turbine generator 30B includes a wind turbine generator body and a power conditioner, and is connected to the DC bus 10 via a DC/DC converter 21B.
  • the DC/DC converters 21A and 21B may be built in each power conditioner.
  • the power conditioner has an MPPT (Maximum Power Point Tracking) function, an ON/OFF command receiving function, a power amount adjustment command receiving function, a power generation information transmitting function, and the like, and is configured to communicate with the power management device 60. ..
  • the type and number of the natural energy power generation devices 30 connected to the DC bus 10 are not particularly limited, but it is preferable to include the solar power generation device 30A.
  • the electric power generated by the solar power generation device 30A and the wind power generation device 30B is supplied to the load device 40 and the storage battery 50 via the DC bus 10.
  • the load device 40 is, for example, a PC, an air conditioner, a TV, LED lighting, or the like. These load devices 40A to 40D are connected to the DC bus 10 via the DC/DC converters 22A to 22D, respectively, and receive power from the DC bus 10.
  • the storage battery 50 includes a plurality of storage batteries 50A to 50C, and each storage battery 50A to 50C includes a storage battery main body (battery cell) and a BMU (Battery Management Unit) for monitoring and controlling the charge state.
  • the storage batteries 50A to 50C are connected to the DC bus 10 via the bidirectional DC/DC converters 23A to 23C, respectively, and the power generated by the natural energy power generation device 30 is less than the power consumed by the load device 40 (load power). If the load power is larger than the generated power, the excess power of the generated power is charged, and if the load power is larger than the generated power, the excess power is discharged to replenish the insufficient load power.
  • the storage batteries 50A to 50C have substantially the same maximum capacity and charge/discharge performance.
  • the BMU of the storage battery 50 has an ON/OFF command reception function, a DC bus voltage adjustment command reception function, a charging/discharging current amount adjustment command reception function, a storage battery information transmission function, and the like, and is configured to communicate with the power management device 60. Has been done.
  • the SOC State Of Charge: Remaining capacity (Ah)/Fully charged capacity (Ah) ⁇ 100 indicating the charging rate of each of the storage batteries 50A to 50C is appropriately notified to the power management apparatus 60.
  • the node 2 may further include a diesel generator 35.
  • a diesel generator 35 By operating the diesel generator 35 when the power generated by the natural energy power generation device 30 is small, the power generation amount can be forcibly increased. Therefore, it is possible to suppress the load power and avoid a power failure, and it is possible to stably supply power to the load device 40. Further, the diesel generator 35 can be used as a power source when starting up the entire system including the DC bus 10. Since the diesel generator 35 generally has an AC output, the diesel generator 35 is connected to the DC bus 10 via the AC/DC converter 24.
  • the power management device 60 is a computer system equipped with an EMS (Energy Management System).
  • the power management device 60 can remotely control the input/output operations of the DC/DC converters 21 to 23, and can control the power generation amount of the natural energy power generation device 30 and the power demand of the load device 40.
  • the power management device 60 commands the natural energy power generation device 30, the load device 40, and the storage battery 50, and collects information from these devices.
  • the collection of commands and information to these devices is performed using a communication method such as RS-232C, RS-485, CAN (Controller Area Network), Ethernet, Wi-Fi.
  • FIG. 3 is a block diagram schematically showing the configuration of the power management apparatus 60.
  • the power management apparatus 60 includes a power management unit 61 that functions as the EMS described above, a communication unit 62 that communicates with the administrator terminal 71 and the like via the communication network 70, and the surroundings. And a node monitoring unit 63 that monitors the operating states of other existing nodes.
  • the node monitoring unit 63 a beacon transmitting unit 64 that transmits a beacon for notifying the operating state of itself, a beacon receiving unit 65 that receives a beacon from another node, at least a monitoring target list of a node and a reception history of beacons.
  • a node database 66 that manages the node
  • a node management unit 67 that manages the operating state of the monitored node based on the node database 66
  • an alarm output unit 68 that outputs an alarm mail in response to an instruction from the node management unit 67. I have it.
  • the beacon transmitting unit 64 regularly broadcasts a beacon including a unique identifier.
  • the beacon is, for example, a wireless signal called an BLE (Bluetooth Low Energy (Bluetooth is a registered trademark)) advertisement packet.
  • BLE Bluetooth Low Energy (Bluetooth is a registered trademark)
  • the beacon communication method is not limited to the short-range wireless communication method using the 2.4 GHz frequency band, and may be a communication method according to the wireless LAN standard (IEEE802.11), or any other special communication method. May be.
  • -It is preferable to use one-way communication for beacon transmission.
  • the distributed DC power supply system it is necessary to reduce the standby power of the node as much as possible, and when mutual monitoring of the nodes is performed by bidirectional communication, there is a concern that power consumption will increase.
  • one-way communication as a communication method for mutual monitoring of nodes, it is possible to reduce power consumption as compared with bi-directional communication.
  • the beacon is preferably a wireless signal.
  • a DC grid as a transmission medium
  • the power management device 60 Even if it is normal, the beacon cannot be transmitted.
  • beacons can be transmitted even if the DC bus goes down as long as the power supply is secured.
  • the DC grid is used as the transmission medium, it is necessary to consider the signal transmission quality, but if it is wireless, no special consideration is required for the transmission medium. Therefore, the node monitoring function can be handled separately from the DC grid, and the expandability of the system can be improved.
  • the beacon may include information about energy management in the node, such as the charging rate of the storage battery 50 and the power generation amount of the natural energy power generation device 30. For example, when one node sends a beacon that notifies the decrease of the charging rate and surrounding nodes receive it, one node puts the entire system including the storage battery in charging mode and the other node sets the entire system including the storage battery Set to discharge mode. Thereby, power can be supplied from one node to the other node, and the beacon can be used as a trigger signal when power is exchanged between the nodes.
  • energy management in the node such as the charging rate of the storage battery 50 and the power generation amount of the natural energy power generation device 30.
  • the beacon receiving unit 65 constantly monitors and receives beacons transmitted by the power management devices 60 of other nodes.
  • the beacon reception unit 65 provides the node management unit 67 with information such as an identifier included in the received beacon.
  • the node management unit 67 determines whether the identifier included in the beacon is registered in the monitoring target list, that is, whether the node that has transmitted the beacon is a monitoring target. Then, when the identifier included in the beacon is registered in the monitoring target list, the reception date and time of the node beacon is recorded in the node database 66. On the other hand, when the identifier included in the beacon is not registered in the monitoring target list, the identifier is added to the monitoring target list triggered by the reception of the beacon including the identifier a specified number of times within a specified time.
  • the node management unit 67 refers to the node database 66 and identifies a monitoring target node that has not received a beacon for a certain period of time.
  • the criterion for determining whether or not the node is abnormal is not particularly limited, and it is possible to detect that a beacon broadcast regularly (for example, once a minute) has not been received within a prescribed time (for example, within 1 minute). It may be judged that the node is abnormal, or it may be judged that the node has not been received multiple times within a period in which the beacon can be received multiple times (for example, within 5 minutes). Good.
  • the waiting time for receiving a beacon from each node is set to an arbitrary time that is at least longer than the beacon transmission cycle.
  • the node management unit 67 instructs the alarm output unit 68 to output an alarm, and the alarm received in response to such a command.
  • the output unit 68 outputs an alarm mail to the administrator terminal 71 via the communication network 70.
  • the alert mail preferably includes an identifier included in the beacon transmitted by the node determined to be abnormal.
  • 4A to 4C are diagrams for explaining the mutual monitoring operation between a plurality of nodes.
  • the three nodes 2A, 2B, 2C are broadcasting beacons to inform their surroundings of their existence.
  • the node 2A exists in the communication area with the node 2B, it can receive the beacon from the node 2B, but cannot receive the beacon from the node 2C existing outside the communication area.
  • the node 2C is within the communication range with the node 2B, it can receive the beacon from the node 2B, but cannot receive the beacon from the node 2A existing outside the communication range.
  • the node 2B can receive the beacons of both the nodes 2A and 2C existing in the communication area. For example, in the case of BLE, the communication distance is around 10 m.
  • Nodes 2A to 2C add the node to the monitoring target list when receiving beacons from other nodes a specified number of times within a specified time. For example, when the node 2B is newly installed, the nodes 2A and 2C will receive the beacon from the node 2B. Therefore, the node 2B receives the beacon from the node 2B a specified number of times within a specified time. To the watch list. In the node 2B, both the nodes 2A and 2C are added to the monitoring target list.
  • the nodes 2A to 2C can continue to periodically transmit the beacon when the power management device 60 that controls the entire node is operating normally. Therefore, other nodes that have received the beacon can determine that the monitored node is operating normally.
  • the node 2A that receives the beacon from the node 2B indicates that the node 2B is normal. Since the node 2B that has made the determination and receives the beacon from the node 2A determines that the node 2A is normal, mutual monitoring between the nodes 2A and 2B can be realized. Although not shown, similar mutual monitoring is performed between the nodes 2B and 2C.
  • the node 2B transmits the beacon from the node 2A. I can't receive.
  • the node 2B determines that the node 2A is not operating normally and outputs a warning mail to that effect.
  • the alert mail is not limited to the so-called Internet mail protocol, and may be a dedicated message protocol. In this way, the administrator who receives the warning mail via the administrator terminal 71 can immediately start the investigation of the cause of the failure of the node 2A and the restoration work.
  • the power management device 60 may suppress the transmission of the warning mail when the beacon includes a special flag that notifies that the downtime is about to occur.
  • the DC bus is down due to the decrease in the amount of power generation and the remaining amount of the storage battery, the system is restored when the amount of power generation increases on the next day. Therefore, it may be necessary to output an alarm mail only when the power management device 60 itself fails. is there.
  • the system down of the node is due to a mere power shortage or a special abnormality such as a failure of the power management apparatus 60, and only when the power management apparatus 60 is abnormal, an alarm mail is issued. Can be output.
  • system down due to a decrease in the amount of power generated by the natural energy power generation device 30 and a decrease in the remaining capacity of the storage battery 50 is allowed to some extent, so the entire system in the node 2 is controlled.
  • the system down due to a mere power shortage may occur.
  • the power management apparatus 60 transmits a beacon to inform the surroundings that the node 2 is operating normally. Therefore, mutual monitoring of the nodes 2 can be realized, and the reliability of the distributed DC power supply system can be improved.
  • the distributed DC power supply system 1 has a plurality of nodes 2 connected to each other via the DC bus 10, and each node 2 periodically transmits a beacon including a unique identifier. If the identifier included in the beacon transmitted from another node is not registered in the monitoring target list, it is added to the monitoring target list and a beacon including the identifier registered in the monitoring target list is specified. Since the alarm is output when the specified number of times is not received within the time, the abnormality of each node can be detected quickly and surely without using a dedicated monitoring device.
  • one-way communication is taken as an example of a communication method for mutual monitoring of nodes, but the present invention is not limited to this and two-way communication may be used.
  • a specific inquiry command is transmitted from the node 2A to the node 2B by a radio signal and the node 2A receives the response command from the node 2B, it may be determined that the node 2B is operating normally.
  • the configuration of the node 2 shown in FIG. 2 is an example, and various system configurations can be adopted as long as it has a power generation function and a power storage function.
  • the configuration in which a plurality of nodes connected to the same DC bus mutually monitor each other has been taken as an example, but the present invention is not limited to such a case, and different DC buses may be used.
  • a plurality of nodes connected to each other may monitor each other.
  • one node can receive the beacon from the other node in the communication range of each other, it is possible to monitor each other regardless of whether they are on the same DC bus. Further, in this case, it is possible to electrically connect the DC buses to each other only when power interchange is necessary.

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

Abstract

Le problème décrit par la présente invention est de fournir un système d'alimentation en puissance à courant continu distribué apte à détecter la défaillance de chaque nœud sans utiliser de dispositif de surveillance dédié. La solution selon l'invention porte sur un système d'alimentation en puissance à courant continu distribué qui comprend : une pluralité de nœuds ayant une fonction de génération de puissance et une fonction de stockage d'électricité ; et un bus CC ou une pluralité de bus CC auxquels la pluralité de nœuds sont connectés. La pluralité de nœuds comprennent chacun : une unité de transmission de balise (64) pour transmettre périodiquement une balise comprenant un identifiant unique ; une unité de réception de balise (65) pour recevoir une balise transmise par un autre nœud ; une base de données de nœuds (66) pour gérer une liste de cibles à surveiller du nœud et un historique de réception de balise ; une unité de gestion de nœuds (67) qui, lors de la réception, de premières fois spécifiées dans une première période de temps spécifiée, d'une balise comprenant un identifiant non enregistré dans la liste de cibles à surveiller, ajoute ledit identifiant à la liste de cibles à surveiller ; et une unité de sortie d'alarme (68) qui, lorsqu'elle ne reçoit pas, de secondes fois spécifiées dans une seconde période de temps spécifiée, une balise comprenant un identifiant enregistré dans la liste de cibles à surveiller, délivre une alarme.
PCT/JP2019/005502 2019-02-15 2019-02-15 Système d'alimentation en puissance à courant continu distribué WO2020166051A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010148172A (ja) * 2008-12-16 2010-07-01 Sony Corp 電力供給システム
JP2016082666A (ja) * 2014-10-15 2016-05-16 ソニー株式会社 電力経路情報生成装置、電力経路検出方法及びコンピュータプログラム
WO2016098205A1 (fr) * 2014-12-17 2016-06-23 富士通株式会社 Système de collecte, dispositif de collecte et procédé de commande d'énergie
JP2018026763A (ja) * 2016-08-12 2018-02-15 矢崎エナジーシステム株式会社 無線通信システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010148172A (ja) * 2008-12-16 2010-07-01 Sony Corp 電力供給システム
JP2016082666A (ja) * 2014-10-15 2016-05-16 ソニー株式会社 電力経路情報生成装置、電力経路検出方法及びコンピュータプログラム
WO2016098205A1 (fr) * 2014-12-17 2016-06-23 富士通株式会社 Système de collecte, dispositif de collecte et procédé de commande d'énergie
JP2018026763A (ja) * 2016-08-12 2018-02-15 矢崎エナジーシステム株式会社 無線通信システム

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