JP2015171199A - power management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management system capable of easily notifying availability of reconnection at a low cost after a distributed power supply capable of system interconnection is paralleled off from a commercial power system.SOLUTION: A solar electric power generator 13 has a function to convert a discharge power from a photovoltaic generation 131 into an AC power synchronized with a commercial power to output the same to a commercial power system. The solar electric power generator 13 includes a parallel-off unit 130 that performs parallel-off of connection from the commercial power system upon a power failure of the commercial power system. An integration panel 4 transmits a permission signal to a parallel-off unit 130 to permit re-connection to switch a parallel-off device 133 from the parallel-off state to the connected state via a private communication network 9.

Description

  The present invention generally relates to a power management system, and more particularly to a power management system that controls reconnection of a distributed power source to a commercial power system.

  In recent years, distributed power sources such as photovoltaic power generation devices and power storage devices that can be connected to the grid have been installed in electricity consumers (buildings where consumers live, each dwelling in an apartment house, each tenant in a tenant building, etc.) It has been proposed (see, for example, Patent Document 1). In Patent Document 1, the power storage device is linked to a commercial power system to which commercial power is supplied, and converts the discharge power of the storage battery into AC power and outputs it to the commercial power system. The power storage device includes a disconnector in the AC output path, and closes the disconnector when the commercial power is energized to link the power storage device to the commercial power system (in parallel). In addition, the power storage device opens the disconnector in the event of a system abnormality such as a commercial power failure, and disconnects the power storage device from the commercial power system.

JP 2013-165624 A

  When a system abnormality such as a commercial power outage is detected, it is necessary to disconnect the distributed power source from the commercial power system. In the case of a low-voltage power receiving contract, it is allowed to automatically re-connect (re-parallel) after a certain time has elapsed if the system abnormality is recovered.

  However, in order to reconnect distributed power sources in a high-voltage power receiving contract, a manager such as a chief engineer who manages the power system reconnects to a power company such as a contracting power company. You may be asked to obtain permission. The administrator uses the telephone, e-mail, etc. to confirm the permission of reconnection with the electric power company, and then performs reconnection processing.

  Therefore, when a distributed power source is installed in a dwelling unit that is an exclusive part of an apartment house under a high-voltage power receiving contract, the administrator needs to notify each of the plurality of dwelling units that the redistribution of the distributed power source is possible. There are currently the following methods.

  As a first method, a dedicated communication line is drawn into each dwelling unit from a management room or the like provided in a common part of the apartment house, and each dwelling unit is notified that the redistribution of the distributed power supply is possible via this dedicated line. There is a way.

  As a second method, there is a method in which the manager of the apartment house visits each dwelling unit and notifies each dwelling unit separately that the distributed power supply can be reconnected.

  However, in the first method described above, it is necessary to construct a dedicated communication line, which leads to a complicated system and high cost. Further, in the second method described above, it is necessary to visit all the dwelling units in the manager's apartment house, which makes the administrator troublesome and leads to an increase in labor costs.

  The present invention has been made in view of the above reasons, and its purpose is to provide a simple and low-cost notification that a grid-connected distributed power source can be re-connected after being disconnected from the commercial power system. It is to provide a power management system that can do this.

  A power management system according to the present invention is installed in a common part of an apartment house and can communicate via a local communication network used for the intercom system of the apartment house, and via the local communication network A disconnecting unit capable of communicating and disconnecting a distributed power source installed in each of the dwelling units of the apartment house and outputting an alternating current coordinated with the commercial power to the commercial power system. And the communication terminal sends a permission signal for permitting the reconnection to the local communication network by sending a message indicating that reconnection to switch the distributed power source from the disconnected state to the connected state is permitted. Is transmitted to the separation unit.

  In this invention, it is installed in each of the dwelling units, and has a master unit having a call function via the local communication network, and the communication terminal transmits to the master unit that the reconnection is permitted. When the master unit is notified that the reconnection is permitted, it is preferable that the permission signal is transmitted to the disconnection unit.

  A power management system of the present invention is installed in a dwelling unit and can communicate via an external wide-area communication network. The HEMS controller communicates with the HEMS controller and is installed in each of the dwelling units. And a decoupling unit capable of connecting and disconnecting the distributed power source that outputs alternating current coordinated to the commercial power system to the commercial power system, and the HEMS controller removes the distributed power source from the disconnected state. When notification is given via the wide-area communication network that reconnection to switch to the connection state is permitted, a permission signal for permitting reconnection is transmitted to the disconnection unit.

  The power management system of the present invention has a communication function with a HEMS controller installed in a dwelling unit, an external communication network installed for each dwelling unit to which information about power is transmitted, and a communication function with the HEMS controller. Communicating with a communication terminal and the HEMS controller, and connecting / disconnecting a distributed power source installed in each of the dwelling units and outputting alternating current coordinated with commercial power to the commercial power system to the commercial power system The HEMS controller is notified from the communication network via the communication terminal that the reconnection is allowed to switch the distributed power source from the disconnected state to the connected state. A permission signal for permitting the reconnection is transmitted to the disconnecting unit.

  In this invention, it is preferable to provide a disconnection control unit that reconnects the distributed power supply when the disconnection unit receives the permission signal.

  In this invention, it is preferable to provide a notification device that notifies that redistribution of the distributed power supply is possible when the disconnection unit receives the permission signal.

  As described above, in the power management system of the present invention, since an existing communication infrastructure (Infrastructure) can be used, it is not necessary to newly construct a dedicated communication network. Therefore, the power management system of the present invention has an effect that it is possible to easily and inexpensively notify that re-interconnection is possible after a distributed power source capable of grid connection is disconnected from the commercial power system. is there.

It is a block diagram which shows the structure of the power management system of Embodiment 1. It is a block diagram which shows a part of structure of the solar power generation device of Embodiment 1. FIG. It is a block diagram which shows the structure of the power management system of Embodiment 2. It is a block diagram which shows the structure of the power management system of Embodiment 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a configuration of a power management system according to the present embodiment used under a high-voltage power receiving contract. This power management system uses the communication infrastructure (infrastructure) of the intercom system for apartment buildings.

  The intercom system for collective housing includes a lobby intercom 1 (slave unit), a house information panel 2 (master unit), a door phone slave unit 3 (slave unit), and an integrated panel 4 (communication terminal) as main components. The lobby intercom 1 is installed in a lobby (common entrance) of an apartment house. The house information board 2 forms an interphone master unit and is installed in each of a plurality of dwelling units in the apartment house. The doorphone sub unit 3 is installed at the entrance of each dwelling unit. The integrated panel 4 is a management communication terminal installed in a common part of an apartment house such as a manager room or an electrical room. The lobby intercom 1, the house information panel 2, the doorphone slave unit 3, and the integrated panel 4 are connected to a local communication network 9 installed in the apartment house, and communicate with each other via the local communication network 9. Each of the lobby intercom 1, the house information panel 2, the doorphone slave unit 3, and the integrated panel 4 is previously assigned an address used for the communication protocol of the local area communication network 9 (communication protocol of the intercom system for collective housing). And each of the lobby intercom 1, the house information panel 2, the door phone slave unit 3, and the integrated panel 4 can specify a transmission destination, a transmission source, and the like of the signal by adding an address to the transmission signal. In FIG. 1, a communication path using the local area communication network 9 is indicated by a solid line, and a power supply path is indicated by a one-dot chain line.

  And the visitor of a lobby can call the house information board 2 in a desired dwelling unit with the lobby intercom 1, and can talk with the housekeeper in a dwelling unit. A visitor at the entrance of each dwelling unit can call the house information board 2 in the desired dwelling unit with the doorphone sub-unit 3 to make a call with the dweller in the dwelling unit. That is, the lobby intercom 1, the house information panel 2, and the door phone sub unit 3 include a voice input / output unit such as a microphone and a speaker, an operation unit that performs a call operation, a call start operation, a call stop operation, and the like. Send and receive control signals to each other. Furthermore, a camera can be provided in the lobby intercom 1 and a monitor screen can be provided in the house information panel 2. In this case, the image of the visitor in the lobby imaged by the camera can be displayed on the monitor screen of the house information board 2. At this time, audio and image data are packetized through digital compression and modulation processing, and transmitted through the local area network 9.

  The integrated panel 4 also includes a voice input / output unit such as a microphone and a speaker, an operation unit for performing a call operation, a call start operation, a call stop operation, and the like. The lobby interphone 1, the house information panel 2, the door phone sub unit 3 Audio signals and control signals can be transmitted to and received from each other. Further, the integrated panel 4 has functions such as a control device of a condominium HA (Home Automation) system, a management office master unit, and remote inspection of various alarm devices.

  Moreover, the distribution board 11 installed in the dwelling unit is connected to the AC 100 / 200V main line 21 drawn into the dwelling unit, and commercial power is supplied from the power system of the power company through the main line 21. The The meter-reading meter 12 is provided in the main line 21 and has a communication function of measuring the power consumption of the commercial power source and transmitting the measurement result (meter-reading data) using wireless communication, power line carrier communication, or the like. . The communication function of the meter-reading meter 12 is used for remote meter-reading or the like in which meter-reading data is collected by a host device at a remote location.

  The distribution board 11 houses a plurality of branch breakers, and the main line 21 branches to a plurality of branch lines 22 laid in the dwelling unit. Each branch electric circuit 22 is connected to a device 14 such as an air conditioner, a lighting device, or an information device, and supplies power to these devices 14. Hereinafter, a power system to which commercial power including the main line 21 and the branch circuit 22 is supplied is referred to as a commercial power system.

  Furthermore, the solar power generation device 13 is connected to the distribution board 11 via the branch electric circuit 22. The solar power generation device 13 includes a solar cell 131, a power converter 132, a disconnector 133, a disconnection controller 134, a communication unit 135, and an alarm 136. In this embodiment, the disconnector 133, the disconnection control unit 134, and the communication unit 135 constitute a disconnection unit 130.

  The power converter 132 converts the power generated by the solar cell 131 into AC power and outputs the AC power to the branch circuit 22. The power converter 132 has a grid-connected operation function for coordinating the AC output supplied to the branch circuit 22 with commercial power.

  As shown in FIG. 2, the circuit breaker 133 has a contact unit 13a provided in the AC output path of the power converter 132. By opening the contact of the contact unit 13a, the solar power generation device 13 is installed. Disconnect from commercial power system.

  The disconnection control unit 134 detects the energization / power failure of the commercial power by monitoring the voltage of the branch circuit 22. The disconnection control unit 134 closes the contact of the contact unit 13a of the disconnector 133 during normal time when commercial power is energized (closed control), and connects the photovoltaic power generator 13 to the commercial power system. Yes (parallel). Then, when the disconnection control unit 134 detects a power failure (system abnormality) of the commercial power, it opens the contact of the contact unit 13a of the disconnector 133 (open control), and disconnects the photovoltaic power generator 13 from the commercial power system. To line up.

  The communication unit 135 is connected to the local communication network 9. In FIG. 1, the communication unit 135 of the disconnection unit 130 is directly connected to the house information panel 2, and the communication unit 135 passes through the house information panel 2 to the door phone sub unit 3, the integrated panel 4, and the lobby intercom. 1 is connected.

  The notification device 136 has a function of notifying a householder in the dweller of reconnection permission described later. For example, at least one of a lighting unit such as an LED, a display unit such as a liquid crystal screen, and an audio output unit including a speaker. With one.

  Next, a reconnection (re-parallel) process for connecting the solar power generation device 13 to the commercial power system from a state where the solar power generation device 13 is disconnected from the commercial power system at the time of a power failure will be described.

  First, an administrator, such as a chief engineer, sends a telephone or e-mail notification of a power recovery when the supply of commercial power resumes from a power company that performs dispatched power or a service provider that manages power on behalf of the power company. Receive with etc. Then, the integrated panel 4 transmits a notification signal indicating that re-interconnection is permitted to the house information panel 2 by the operation of the administrator. Alternatively, the integrated panel 4 is connected to the operation terminal 41 carried by the administrator, and when the operation terminal 41 is operated, the integrated panel 4 transmits a notification signal for permitting reconnection to the house information panel 2. It is preferable.

  Then, the house information board 2 that has received the notification signal transmits a permission signal for permitting reconnection to the disconnection unit 130.

  In the disconnection unit 130, when the communication unit 135 receives the permission signal, the disconnection control unit 134 controls the disconnector 133 to be closed after confirming the safety interlock, and the photovoltaic power generation device 13. Is preferably reconnected to the commercial power system.

  In addition, when the communication unit 135 of the disconnection unit 130 receives the permission signal, it is preferable that the notification device 136 informs the householder in the dwelling unit that the reconnection of the solar power generation device 13 is permitted. For example, it is preferable that the alerting | reporting device 136 notifies a householder of permission of re-linkage by lighting or blinking of lighting parts, such as LED, or the change of luminescent color. Or it is preferable that the alerting | reporting device 136 notifies a householder of the reconnection permission by the display of a liquid crystal screen. Or it is preferable that the alerting | reporting device 136 notifies a family member of permission of re-linkage by outputting sounds, such as a buzzer sound and a message, from a speaker. In this case, it is preferable that the disconnection control unit 134 controls the disconnector 133 to be closed by the operation of a householder so that the solar power generation device 13 is reconnected to the commercial power system.

  In this embodiment, the reconnection process of the solar power generation device 13 can be performed using the local area communication network 9 which is a communication infrastructure of a residential intercom system. That is, since the local communication network 9 which is an existing communication infrastructure can be used, there is no need to newly construct a dedicated communication network. For example, in an apartment house with a high-voltage power receiving contract, it is possible to simplify the reconnection procedure performed by a manager such as a chief engineer for a large number of distributed power sources using existing wiring in the apartment house. Become.

  Therefore, the power management system can easily and inexpensively notify that re-linkage is possible after the grid-connected solar power generation device 13 is disconnected from the commercial power grid.

  The power management system of this embodiment includes an integrated panel 4 (communication terminal) and a disconnection unit 130. The integrated panel 4 is installed in the common part of the apartment house and can communicate via the local communication network 9 used for the intercom system of the apartment house. The disconnecting unit 130 can communicate via the local area communication network 9 to link and disconnect the solar power generation device 13 (distributed power source) to the commercial power system. The solar power generation device 13 is installed in each dwelling unit of an apartment house, and outputs alternating current coordinated with commercial power to the commercial power system.

  The integrated panel 4 sends to the local communication network 9 that permission for reconnection to switch the photovoltaic power generation device 13 from the disconnected state to the connected state is sent, so that the permission signal for permitting the reconnection is disconnected. 130.

(Embodiment 2)
FIG. 3 shows the configuration of the power management system of this embodiment used under a high-voltage power receiving contract. This power management system uses a HEMS (Home Energy Management System) communication infrastructure including a wide-area communication network 33 such as the Internet. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 1, and description is abbreviate | omitted. In FIG. 3, a communication path using the HEMS communication infrastructure is indicated by a solid line, and a power supply path is indicated by an alternate long and short dash line.

  First, the HEMS controller 31 is provided in the dwelling unit. The HEMS controller 31 performs wireless communication with devices 14 such as an air conditioner, a lighting device, and information equipment. As a wireless communication standard used by the HEMS controller 31, for example, there is ECHONET Lite. And the HEMS controller 31 acquires meter-reading data of the meter-reading meter 12, and the data of the electric power used for every branch electric circuit 22, and controls energy management in homes, such as the optimal driving | operation of the apparatus 14, and the real-time display of an energy usage condition To do.

  Further, the HEMS controller 31 is connected to an external wide area network 33 including the Internet via a router 32. The wide area communication network 33 is also connected to a power server that performs dispatched power, or a host server 34 that is managed (operated) by a service provider that performs power management on behalf of the power provider. The host server 34 is also configured to be communicable. The host server 34 has a function of notifying the HEMS controller 31 of information such as demand response for requesting reduction of power consumption. The HEMS controller 31 controls energy management at home such as optimal operation of the device 14 and display of various information based on various information received from the host server 34.

  In this embodiment, the disconnector 133, the disconnection control unit 134, and the communication unit 137 constitute the disconnection unit 130. The communication unit 137 of the disconnection unit 130 has a function of performing wireless communication with the HEMS controller 31 in the same manner as the device 14. That is, the disconnection unit 130 can be regarded as a device that can be controlled by the HEMS controller 31.

  Next, a reconnection (re-parallel) process for connecting the solar power generation device 13 to the commercial power system from a state where the solar power generation device 13 is disconnected from the commercial power system at the time of a power failure will be described.

  First, when the supply of commercial power is resumed, the upper server 34 transmits a notification signal to the HEMS controller 31 indicating that reconnection is permitted. Then, the HEMS controller 31 that has received the notification signal transmits a permission signal for permitting reconnection to the disconnection unit 130.

  In the disconnection unit 130, when the communication unit 137 receives the permission signal, the disconnection control unit 134 controls the disconnector 133 to be closed after confirming the safety interlock, and the photovoltaic power generation device 13. Is preferably reconnected to the commercial power system.

  In addition, when the communication unit 137 of the disconnection unit 130 receives the permission signal, it is preferable that the alarm 136 informs the householder in the dwelling unit that the reconnection of the solar power generation device 13 is permitted. For example, it is preferable that the alerting | reporting device 136 notifies a householder of permission of re-linkage by lighting or blinking of lighting parts, such as LED, or the change of luminescent color. Or it is preferable that the alerting | reporting device 136 notifies a householder of the reconnection permission by the display of a liquid crystal screen. Or it is preferable that the alerting | reporting device 136 notifies a family member of permission of re-linkage by outputting sounds, such as a buzzer sound and a message, from a speaker. In this case, it is preferable that the disconnection control unit 134 controls the disconnector 133 to be closed by the operation of a householder so that the solar power generation device 13 is reconnected to the commercial power system.

  In this embodiment, the reconnection process of the solar power generation device 13 can be performed using the communication infrastructure of HEMS. In other words, the HEMS communication infrastructure which is an existing communication infrastructure can be used, and it is not necessary to newly construct a dedicated communication network. For example, in an apartment house with a high-voltage power receiving contract, it is possible to simplify the reconnection procedure performed by a manager such as a chief engineer for a large number of distributed power sources using existing wiring in the apartment house. Become.

  Therefore, the power management system can easily and inexpensively notify that re-linkage is possible after the grid-connected solar power generation device 13 is disconnected from the commercial power grid.

  The power management system of this embodiment includes a HEMS controller 31 and a disconnection unit 130. The HEMS controller 31 is installed in a dwelling unit and can perform communication via an external wide area communication network 33. The disconnection unit 130 can communicate with the HEMS controller 31 to link and disconnect the solar power generation device 13 (distributed power supply) to the commercial power system. The photovoltaic power generation device 13 is installed in each of the dwelling units and outputs alternating current coordinated with commercial power to the commercial power system.

  When the HEMS controller 31 is notified via the wide-area communication network 33 that the reconnection to switch the photovoltaic power generation device 13 from the disconnected state to the connected state is permitted, the HEMS controller 31 cancels the permission signal to permit the reconnection. Transmit to the column unit 130.

(Embodiment 3)
FIG. 4 shows the configuration of the power management system of the present embodiment used under a high-voltage power receiving contract. This power management system uses a smart grid communication infrastructure (high-order server 35-wide area communication network 33-meter-reading meter 15-communication path of HEMS controller) using the communication function of the meter-reading meter 15. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 2, and description is abbreviate | omitted. Moreover, in FIG. 4, the communication path using the smart grid communication infrastructure is indicated by a solid line, and the power supply path is indicated by a one-dot chain line.

  The meter-reading meter 15 is provided in the trunk line 21 and measures the power consumption of the commercial power source. The meter-reading meter 15 is connected to the wide area communication network 33 using wireless communication, power line carrier communication, or the like, and can communicate with the host server 35. For example, the meter-reading meter 15 transmits a measurement result (meter-reading data) to the host server 35 on the wide area communication network 33. Further, the meter-reading meter 15 has a function of performing wireless communication with the HEMS controller 31 in the dwelling unit. That is, the meter-reading meter 15 can be regarded as a communication terminal having a communication function with the wide area communication network 33 and a communication function with the HEMS controller 31.

  Therefore, the meter-reading meter 15 can transmit various information received from the host server 35 via the wide area communication network 33 to the HEMS controller 31. That is, the upper server 35 can transmit various information to the HEMS controller 31 via the meter-reading meter 15.

  Next, a reconnection (re-parallel) process for connecting the solar power generation device 13 to the commercial power system from a state where the solar power generation device 13 is disconnected from the commercial power system at the time of a power failure will be described. In this embodiment, the disconnector 133, the disconnection control unit 134, and the communication unit 135 constitute a disconnection unit 130.

  First, when the supply of commercial power is resumed, the host server 35 transmits a notification signal indicating that re-interconnection is permitted to the HEMS controller 31 via the meter-reading meter 15. Then, the HEMS controller 31 that has received the notification signal transmits a permission signal for permitting reconnection to the disconnection unit 130.

  In the disconnection unit 130, when the communication unit 137 receives the permission signal, the disconnection control unit 134 controls the disconnector 133 to be closed after confirming the safety interlock, and the photovoltaic power generation device 13. Is preferably reconnected to the commercial power system.

  In addition, when the communication unit 137 of the disconnection unit 130 receives the permission signal, it is preferable that the alarm 136 informs the householder in the dwelling unit that the reconnection of the solar power generation device 13 is permitted. For example, it is preferable that the alerting | reporting device 136 notifies a householder of permission of re-linkage by lighting or blinking of lighting parts, such as LED, or the change of luminescent color. Or it is preferable that the alerting | reporting device 136 notifies a householder of the reconnection permission by the display of a liquid crystal screen. Or it is preferable that the alerting | reporting device 136 notifies a family member of permission of re-linkage by outputting sounds, such as a buzzer sound and a message, from a speaker. In this case, it is preferable that the disconnection control unit 134 controls the disconnector 133 to be closed by the operation of a householder so that the solar power generation device 13 is reconnected to the commercial power system.

  In this embodiment, the reconnection process of the solar power generation device 13 can be performed using the smart grid communication infrastructure using the communication function of the meter-reading meter 15. That is, since a smart grid communication infrastructure, which is an existing communication infrastructure, can be used, there is no need to newly construct a dedicated communication network. For example, in an apartment house with a high-voltage power receiving contract, it is possible to simplify the reconnection procedure performed by a manager such as a chief engineer for a large number of distributed power sources using existing wiring in the apartment house. Become.

  Therefore, the power management system can easily and inexpensively notify that re-linkage is possible after the grid-connected solar power generation device 13 is disconnected from the commercial power grid.

  The power management system of this embodiment includes a HEMS controller 31, a meter-reading meter 15 (communication terminal), and a disconnection unit 130. The HEMS controller 31 is installed in a dwelling unit. The meter-reading meter 15 is installed for every dwelling unit, and has a communication function with the external wide-area communication network 33 (communication network) to which the information regarding electric power is transmitted, and a communication function with the HEMS controller 31. The disconnection unit 130 can communicate with the HEMS controller 31 to link and disconnect the solar power generation device 13 (distributed power supply) to the commercial power system. The photovoltaic power generation device 13 is installed in each of the dwelling units and outputs alternating current coordinated with commercial power to the commercial power system.

  When the HEMS controller 31 is notified from the wide area communication network 33 via the meter-reading meter 15 that the reconnection to switch the photovoltaic power generation apparatus 13 from the disconnected state to the connected state is permitted, the HEMS controller 31 permits the reconnection. A permission signal is transmitted to the disconnection unit 130.

  The distributed power source used in the first to third embodiments may be other power sources such as a power storage device, a fuel cell device, and a wind power generator other than the solar power generator 13.

  In addition, the second and third embodiments can be applied to a detached house or the like other than the dwelling unit of the apartment house.

1 Lobby intercom (slave unit)
2 Housing information board (master unit)
3 Doorphone handset (child machine)
4 Integrated panel (communication terminal)
9 Local network 13 Photovoltaic generator (distributed power supply)
130 Disconnection Unit 131 Solar Cell 132 Power Converter 133 Disconnector 134 Disconnection Control Unit 135 Communication Unit 136 Alarm

Claims (6)

A communication terminal installed in a common part of an apartment house and capable of communicating via a local communication network used for the intercom system of the apartment house, and communicating via the local communication network, A decoupling unit that can be connected to and separated from the commercial power system with a distributed power source that is installed in each of the dwelling units and outputs alternating current coordinated with commercial power to the commercial power system,
The communication terminal sends to the local communication network that permission for reconnection to switch the distributed power source from the disconnected state to the connected state, so that the permission signal for permitting the reconnection is sent to the disconnected unit. Power management system characterized by being transmitted to. It is installed in each of the dwelling units, and includes a master unit having a call function via the local area communication network,
The communication terminal transmits to the base unit that the reconnection is permitted,
2. The power management system according to claim 1, wherein, when notified of permission of the reconnection, the parent device transmits the permission signal to the disconnecting unit. A HEMS controller that is installed in a dwelling unit and can communicate via an external wide-area communication network, and an AC that communicates with the HEMS controller and that is installed in each of the dwelling units and coordinated with commercial power is commercial power. A decoupling unit capable of interconnecting and decoupling the distributed power source that outputs to the grid to the commercial power system,
When the HEMS controller is notified via the wide area communication network that permission for reconnection to switch the distributed power source from the disconnected state to the connected state is permitted, the HEMS controller outputs a permission signal for permitting the reconnection. A power management system that transmits to a row unit. A HEMS controller installed in a dwelling unit, a communication terminal installed in each dwelling unit and having a communication function with an external communication network to which information about power is transmitted and a communication function with the HEMS controller, and the HEMS controller, A disconnecting unit that communicates and outputs a distributed power source installed in each of the dwelling units to the commercial power system that exchanges alternating current that is coordinated with the commercial power. And
When the HEMS controller is notified from the communication network via the communication terminal that the reconnection to switch the distributed power source from the disconnected state to the connected state is permitted, the permission signal to permit the reconnection Is transmitted to the disconnecting unit. A power management system, comprising:   5. The power management system according to claim 1, further comprising a disconnection control unit configured to re-connect the distributed power supply when the disconnection unit receives the permission signal.   6. The power management system according to claim 1, further comprising a notifier that notifies that redistribution of the distributed power supply is possible when the disconnection unit receives the permission signal.

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