JP2021184673A - System interconnection inverter apparatus - Google Patents

Abstract

To provide a system interconnection inverter apparatus which urges residents to switch to autonomous operation from interconnection operation when a power failure has occurred in a power system.SOLUTION: A system interconnection inverter apparatus 1 has a function of performing an interconnection operation for supplying AC power supplied from a power system 81 to a load 82, and performing an autonomous operation that supplies the load 82 with AC power which is based on DC power supplied from a DC power supply 83 when a power failure has occurred in the power system 81. The system interconnection inverter apparatus 1 includes: a first voltage detection unit 11 for detecting a voltage in the AC power supplied from the power system 81; and a control unit 16 that makes a notification unit 17 notify the outside of the system interconnection inverter apparatus 1 of reminder information as information for promoting switching of operation of the system interconnection inverter apparatus 1 to autonomous operation from interconnection operation when it is determined that a power failure has occurred in the power system 81 on the basis of a detection result obtained by the first voltage detection unit 11.SELECTED DRAWING: Figure 1

Description

The present disclosure includes a function for performing interconnection operation in which AC power supplied from the power system is supplied to the load and a function for performing independent operation in which AC power based on the DC power supplied from the DC power supply is supplied to the load. The present invention relates to a grid interconnection inverter device having the above.

In recent years, natural disasters such as typhoons and earthquakes have frequently occurred in Japan, and due to the effects of natural disasters, relatively large-scale and relatively long-term power outages have occurred. The grid-connected inverter device included in the photovoltaic power generation system has a self-sustaining operation function of supplying the power generated by the solar cell to the home when a power failure occurs in the power system (see, for example, Non-Patent Document 1). By utilizing the self-sustaining operation function of the grid-connected inverter device, residents can use home appliances such as refrigerators and charge information terminal devices such as mobile phones or smartphones even if a power outage occurs in the power system. Can be done. That is, the resident can store food and collect information even if a power outage occurs in the power system.

Electrical Technology Regulations Grid-interconnection Code JEAC 9701-2019 "Japan Electric Association Grid-interconnection Special Subcommittee, 24th revision March 5, 2019 p.16 (8) Independent operation

As shown in Non-Patent Document 1, the conventional grid-connected inverter device has a self-sustaining operation function of supplying power only to the load in the premises where the installer of the power generation facility resides when a power failure occurs in the power system. Therefore, the resident can use the electric power generated by the solar cell during the daytime sunshine. An example of a power generation facility is a residential photovoltaic system, and an example of an installer is a resident.

For example, in a residential photovoltaic power generation system, the grid-connected inverter device starts self-sustaining operation by being operated by a resident. If the resident is unaware of the existence of the function of self-sustaining operation, when a power outage occurs in the power system, the resident can actually utilize the power obtained by the solar cell, but actually uses the power. It cannot be utilized. There is a demand for a grid-connected inverter device that encourages residents to switch from interconnection operation to autonomous operation when a power outage occurs in the power system, even if the resident does not know the existence of the self-sustaining operation function.

The present disclosure has been made in view of the above, and an object of the present invention is to obtain a grid interconnection inverter device that encourages residents to switch from interconnection operation to independent operation in the event of a power failure in the power system. do.

In order to solve the above-mentioned problems and achieve the object, the grid interconnection inverter device according to the present disclosure is a interconnection that supplies AC power supplied from the power system to the load when a power failure does not occur in the power system. A function to perform system operation and perform independent operation to supply AC power to the load based on the DC power supplied from the DC power supply without connecting the load and the power system when a power failure occurs in the power system. Has. The grid interconnection inverter device includes a first voltage detection unit that detects the voltage in the AC power supplied from the power system to the grid interconnection inverter device, a notification unit that notifies information to the outside of the grid interconnection inverter device, and a first unit. 1 Based on the detection result obtained by the voltage detector, it is determined whether or not a power failure has occurred in the power system. If it is determined that a power failure has occurred in the power system, the interconnection operation is stopped and the interconnection operation is started. When it is determined whether or not the transition to independent operation is possible and it is determined that the transition from interconnection operation to independent operation is possible, the notification unit is notified of the operation of the grid interconnection inverter device from the interconnection operation. It has a control unit for notifying the outside of the grid interconnection inverter device of reminder information which is information for urging to switch to independent operation.

The grid-connected inverter device according to the present disclosure has the effect of encouraging the resident to switch from the interconnection operation to the independent operation when a power failure occurs in the power system.

The figure which shows the structure of the grid interconnection inverter device which concerns on Embodiment 1. A flowchart showing a procedure of a part of the operation performed by the grid interconnection inverter device according to the first embodiment. The figure which shows the structure of the grid interconnection inverter device which concerns on Embodiment 2. A flowchart showing a procedure of a part of the operation performed by the grid interconnection inverter device according to the second embodiment. At least a part of a first voltage detection unit, a second voltage detection unit, a third voltage detection unit, a fourth voltage detection unit, a current detection unit, a control unit, and a notification unit included in the grid interconnection inverter device according to the first embodiment. Is realized by the processor. At least a part of a first voltage detection unit, a second voltage detection unit, a third voltage detection unit, a fourth voltage detection unit, a current detection unit, a control unit, and a notification unit included in the grid interconnection inverter device according to the first embodiment. Is realized by the processing circuit.

Hereinafter, the grid interconnection inverter device according to the embodiment will be described in detail with reference to the drawings.

Embodiment 1.
FIG. 1 is a diagram showing a configuration of a grid interconnection inverter device 1 according to the first embodiment. The grid interconnection inverter device 1 performs an interconnection operation of supplying AC power supplied from the power system 81 to the load 82 when a power failure has not occurred in the power system 81. The grid interconnection inverter device 1 loads an AC power based on the DC power supplied from the DC power supply 83 without connecting the load 82 and the power system 81 when a power failure occurs in the power system 81. It has a function to perform self-sustaining operation. FIG. 1 also shows a power system 81, a load 82, and a DC power supply 83.

The grid interconnection inverter device 1 is electrically connected to the power system 81 via a distribution board installed in the building. The building is a building in which the grid interconnection inverter device 1 is arranged. The distribution board is not shown. The power system 81 may be a commercial power system or a non-commercial power system.

The grid interconnection inverter device 1 is electrically connected to the load 82 via a branch breaker in the distribution board. The load 82 is arranged in the building. The building in which the load 82 is arranged may be a building in which the grid interconnection inverter device 1 is arranged, or may be a building different from the building in which the grid interconnection inverter device 1 is arranged. .. For example, the load 82 is an electrical device. There may be only one electric device or a plurality of electric devices. The load 82 may mean one electric device, or may mean a group of a plurality of electric devices.

When the resident switches the operation of the grid interconnection inverter device 1 from the interconnection operation to the independent operation, the grid interconnection inverter device 1 takes out the electric power obtained by the power generation by the DC power supply 83 from the DC power supply 83. AC power can be supplied to the load 82. For example, the DC power supply 83 is a solar cell.

The AC power output from the grid interconnection inverter device 1 is supplied to the load 82. When the grid interconnection inverter device 1 outputs AC power based on the DC power supplied from the DC power supply 83 to the load 82, the magnitude of the AC power output from the grid interconnection inverter device 1 is the DC power supply. It changes according to the magnitude of the DC power supplied from 83 to the grid interconnection inverter device 1. That is, the larger the DC power supplied from the DC power supply 83 to the grid interconnection inverter device 1, the larger the AC power output from the grid interconnection inverter device 1.

When the AC power output from the grid interconnection inverter device 1 is smaller than the power consumed by the load 82, the AC power is supplied from the grid interconnection inverter device 1 to the load 82 via the distribution board and is also powered. It is supplied from the system 81 to the load 82 via the distribution board.

When the AC power output from the grid interconnection inverter device 1 is larger than the power consumed by the load 82, the surplus power is reverse power flowed to the power system 81 via the distribution board. The surplus power is power obtained by subtracting the power consumed by the load 82 from the AC power output from the grid interconnection inverter device 1. As a result, the grid interconnection inverter device 1 can sell power to the electric power company.

The grid interconnection inverter device 1 has a power conversion unit 2 that converts DC power supplied from the DC power supply 83 to the grid interconnection inverter device 1 to AC power. The power conversion unit 2 converts the DC power obtained by the converter circuit unit 21 and the converter circuit unit 21 having a function of changing the voltage of the DC power supplied from the DC power supply 83 to the grid interconnection inverter device 1 into AC power. It has an inverter circuit unit 22 to operate. The power conversion unit 2 is a filter that removes noise contained in the first DC bus 23 and the second DC bus 24 that connect the converter circuit unit 21 and the inverter circuit unit 22 and the AC power output from the inverter circuit unit 22. It further has a circuit unit 25.

The converter circuit unit 21 boosts the voltage of the DC power supplied from the DC power supply 83 to the grid interconnection inverter device 1 to a voltage higher than the voltage of the AC power supplied from the power grid 81 to the grid interconnection inverter device 1. conduct. The converter circuit unit 21 outputs the DC power obtained by boosting to the first DC bus 23 and the second DC bus 24. The converter circuit unit 21 includes a first capacitor 31, a second capacitor 32, a first reactor 33, a first switching element 34, and a diode 35. The converter circuit unit 21 shown in FIG. 1 is a step-up chopper circuit, but the converter circuit unit 21 is not limited to a step-up chopper circuit and may be a transformer type converter.

The inverter circuit unit 22 includes a second switching element 36, a third switching element 37, a fourth switching element 38, and a fifth switching element 39. The second switching element 36, the third switching element 37, the fourth switching element 38, and the fifth switching element 39 form a full bridge. By switching between the on state and the off state for each of the second switching element 36, the third switching element 37, the fourth switching element 38, and the fifth switching element 39, the inverter circuit unit 22 is transferred from the converter circuit unit 21. The DC power output to the first DC bus 23 and the second DC bus 24 is converted into AC power.

Each of the second switching element 36, the third switching element 37, the fourth switching element 38, and the fifth switching element 39 is a semiconductor switching element. The semiconductor switching element may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).

The filter circuit unit 25 has a second reactor 40, a third reactor 41, and a third capacitor 42. The filter circuit unit 25 removes noise caused by the second switching element 36, the third switching element 37, the fourth switching element 38, and the fifth switching element 39 from the AC power output from the inverter circuit unit 22.

The grid interconnection inverter device 1 further includes a first terminal 3 and a second terminal 4 for receiving AC power supplied from the power system 81. The first terminal 3 and the second terminal 4 are connected to the power system 81 via a switchboard. The first terminal 3 and the second terminal 4 are also connected to the load 82 via the switchboard. The first terminal 3 and the second terminal 4 are output terminals for AC power to the power system 81 when the grid interconnection inverter device 1 reverses power flow to the power system 81. The grid interconnection inverter device 1 has a state in which the power conversion unit 2 is connected to the first terminal 3 and the second terminal 4, and a state in which the power conversion unit 2 is not connected to the first terminal 3 and the second terminal 4. It further has a switch 5 for interconnection operation to be switched.

The grid interconnection inverter device 1 further includes a third terminal 6 and a fourth terminal 7 for the grid interconnection inverter device 1 to output AC power to the self-sustaining outlet 84. FIG. 1 also shows a self-supporting outlet 84. The third terminal 6 and the fourth terminal 7 are connected to the self-supporting outlet 84. When the grid interconnection inverter device 1 operates independently, the load 82 is connected to the independent outlet 84. The AC power output from the power conversion unit 2 is output to the outside of the grid interconnection inverter device 1 via the first terminal 3 and the second terminal 4, or via the third terminal 6 and the fourth terminal 7. NS.

The grid interconnection inverter device 1 has a state in which the power conversion unit 2 is connected to the third terminal 6 and the fourth terminal 7, and a state in which the power conversion unit 2 is not connected to the third terminal 6 and the fourth terminal 7. It further has a switch 8 for self-sustaining operation to be switched. The grid interconnection inverter device 1 further includes a fifth terminal 9 and a sixth terminal 10 for receiving DC power supplied from the DC power supply 83. The DC power supply 83 is connected to the fifth terminal 9 and the sixth terminal 10. The DC power supplied from the DC power supply 83 to the grid interconnection inverter device 1 is supplied to the converter circuit unit 21 via the fifth terminal 9 and the sixth terminal 10.

The grid interconnection inverter device 1 further includes a first voltage detection unit 11 that detects a voltage in AC power supplied from the power grid 81 to the grid interconnection inverter device 1. Specifically, the first voltage detection unit 11 detects the first output voltage value Vuw, which is the instantaneous value of the voltage of the AC power applied between the first terminal 3 and the second terminal 4. The first voltage detection unit 11 can detect the first output voltage value Vuw regardless of the state of the interconnection operation switch 5.

The grid interconnection inverter device 1 further includes a second voltage detection unit 12 that detects a voltage between the fifth terminal 9 and the sixth terminal 10 and the converter circuit unit 21. The second voltage detection unit 12 detects an input voltage value V, which is an instantaneous value of the voltage of the DC power supplied from the DC power supply 83 to the power conversion unit 2 via the fifth terminal 9 and the sixth terminal 10. The grid interconnection inverter device 1 further includes a third voltage detection unit 13 that detects a bus voltage value Vpn, which is an instantaneous value of the voltage between the first DC bus 23 and the second DC bus 24. The grid interconnection inverter device 1 further includes a fourth voltage detection unit 14 that detects a second output voltage value Vfo, which is an instantaneous value of the voltage of AC power between the switch for interconnection operation 5 and the filter circuit unit 25. Have.

The grid interconnection inverter device 1 further includes a current detection unit 15 that detects an output current value Io, which is an instantaneous value of the current of AC power output from the power conversion unit 2 to the first terminal 3. The current detection unit 15 is included in the filter circuit unit 25 included in the power conversion unit 2. The grid interconnection inverter device 1 further includes a power conversion unit 2, a switch 5 for interconnection operation, and a control unit 16 for controlling the switch 8 for independent operation.

In the power conversion unit 2, the control unit 16 controls the on / off of the first switching element 34 included in the converter circuit unit 21, so that the direct current supplied from the DC power supply 83 to the grid interconnection inverter device 1 The voltage of the electric power is boosted to a voltage higher than the voltage of the AC electric power supplied from the electric power system 81 to the grid interconnection inverter device 1.

The control unit 16 controls to switch between an on state and an off state for each of the second switching element 36, the third switching element 37, the fourth switching element 38, and the fifth switching element 39 of the inverter circuit unit 22. conduct.

When an abnormality occurs in at least one of the grid interconnection inverter device 1 and the power grid 81, the control unit 16 turns off the interconnection operation switch 5, the power conversion unit 2, the first terminal 3, and the control unit 16. Make sure that the second terminal 4 is not connected. When operating the grid interconnection inverter device 1 in a state where both the grid interconnection inverter device 1 and the power system 81 are normal, the control unit 16 turns on the interconnection operation switch 5 and power conversion unit 16. 2 is connected to the first terminal 3 and the second terminal 4.

The control unit 16 turns off the switch 8 for independent operation when an abnormality occurs in the grid interconnection inverter device 1 or when the amount of power consumed by the load 82 is equal to or greater than the amount of power obtained by the DC power supply 83. Then, the power conversion unit 2 and the third terminal 6 and the fourth terminal 7 are not connected. When the grid interconnection inverter device 1 is normal and the amount of power consumed by the load 82 is less than the amount of power obtained by the DC power supply 83, the control unit 16 turns on the switch 8 for independent operation. The power conversion unit 2 is connected to the third terminal 6 and the fourth terminal 7.

The grid interconnection inverter device 1 further includes a notification unit 17 for notifying information to the outside of the grid interconnection inverter device 1. Specifically, the notification unit 17 notifies the information to the information terminal device 85 external to the grid interconnection inverter device 1. FIG. 1 also shows the information terminal device 85. An example of the information terminal device 85 is a smartphone or a tablet computer.

By controlling the power conversion unit 2, the control unit 16 converts the DC power supplied from the DC power supply 83 into AC power, and from the first terminal 3 and the second terminal 4 or from the third terminal 6 and the fourth. AC power is output from the terminal 7. When the DC power supply 83 is a solar cell, the magnitude of the DC power that can be output by the DC power supply 83 changes depending on the amount of sunlight to the DC power supply 83. The control unit 16 can detect the amount of DC power that can be output by the DC power supply 83, and execute MPPT (Maximum Power Point Tracking) control that controls the power conversion unit 2 based on the detected result. .. The power conversion unit 2 can output AC power corresponding to the maximum value of the DC power that can be output by the DC power supply 83 by the MPPT control performed by the control unit 16.

The control unit 16 determines whether or not a power failure has occurred in the power system 81 based on the detection result obtained by the first voltage detection unit 11, and if it is determined that a power failure has occurred in the power system 81, the interconnection unit 16 is connected. Stop the operation and judge whether it is possible to shift from the interconnection operation to the independent operation. For example, when the DC power supply 83 is a solar cell, the control unit 16 determines whether or not there is an amount of solar radiation that the DC power supply 83 can generate in the daytime when the determination is made, and the interconnection operation is performed. Judge whether it is possible to shift from to independent operation. When the control unit 16 determines that the transition from the interconnection operation to the independent operation is possible, the control unit 16 prompts the notification unit 17 to switch the operation of the grid interconnection inverter device 1 from the interconnection operation to the independent operation. A certain reminder information is notified to the outside of the grid interconnection inverter device 1. Specifically, when the control unit 16 determines that the transition from the interconnection operation to the independent operation is possible, the control unit 16 causes the notification unit 17 to notify the information terminal device 85 of the reminder information.

The control unit 16 further includes a storage unit 18 that stores information indicating the amount of power generated in the grid interconnection inverter device 1. For example, the storage unit 18 is realized by a semiconductor memory. The storage unit 18 stores power amount information which is information indicating the amount of power generated in the grid interconnection inverter device 1 immediately before the control unit 16 determines that a power failure has occurred in the power system 81. The control unit 16 further has a function of storing information indicating the amount of power generated in the grid interconnection inverter device 1 in the storage unit 18 and a function of reading out the information stored in the storage unit 18. When the notification unit 17 notifies the information terminal device 85 of the reminder information, the control unit 16 determines that the notification unit 17 has the electric energy information stored in the storage unit 18 and that a power failure has occurred in the power system 81. The information terminal device 85 is notified of the electric energy information indicating the electric energy generated by the grid interconnection inverter device 1 immediately before.

The grid interconnection inverter device 1 has an independent operation prevention function that immediately stops the interconnection operation when a power failure occurs in the power system 81. When a power failure occurs, the grid interconnection inverter device 1 cannot restart the interconnection operation until the power is restored. For example, if the DC power supply 83 is a solar cell and a power failure occurs in the power system 81 when there is sunshine in the daytime, the resident can utilize the power obtained by the DC power supply 83.

The grid interconnection inverter device 1 has a self-sustaining operation function that utilizes the electric power obtained by the DC power supply 83 when a power failure occurs in the electric power system 81. The switching from the interconnection operation of the grid interconnection inverter device 1 to the independent operation is performed by the resident of the building in which the grid interconnection inverter device 1 is arranged. The resident may not be aware that the grid interconnection inverter device 1 has the self-sustaining operation function. Therefore, when a power failure occurs in the power system 81, the power obtained by the DC power supply 83 may not be utilized.

Therefore, the grid interconnection inverter device 1 performs the following operations. FIG. 2 is a flowchart showing a procedure of a part of the operation performed by the grid interconnection inverter device 1 according to the first embodiment. The control unit 16 determines whether or not the independent operation prevention function of the grid interconnection inverter device 1 has been operated due to the power failure generated in the power system 81 (S1). When the control unit 16 determines that the independent operation prevention function is not operating (No in S1), the control unit 16 performs the operation in step S1.

When the control unit 16 determines that the independent operation prevention function has been operated (Yes in S1), the control unit 16 determines whether or not the first voltage detection unit 11 can detect the voltage (S2). Further, in step S2, the control unit 16 determines whether or not the first voltage detection unit 11 can detect the voltage when the power system 81 does not have a power failure. As the independent operation prevention function, a frequency feedback method with step injection is adopted in which the interconnection operation is stopped when the change in the frequency of the AC power supplied from the power system 81 exceeds a predetermined value. Since there is a possibility that a temporary change in the frequency of the AC power supplied from the power system 81 to the grid interconnection inverter device 1 may be detected, the first voltage detection unit 11 of the control unit 16 detects the voltage. Judge whether or not it can be done.

When the control unit 16 determines that the first voltage detection unit 11 can detect the voltage (Yes in S2), the control unit 16 performs the operation of step S1. When the control unit 16 determines that the first voltage detection unit 11 cannot detect the voltage (No in S2), the operation of the grid interconnection inverter device 1 can shift from the interconnection operation to the independent operation. Is output to the notification unit 17 (S3).

Based on the information output from the control unit 16, the notification unit 17 notifies the information terminal device 85 of information indicating that the grid interconnection inverter device 1 can operate independently (S4). When the information terminal device 85 receives the information indicating that the grid interconnection inverter device 1 can operate independently and notifies the information by sound or image, the resident can operate the grid interconnection inverter device 1. Recognizes that the operation can be switched from the interconnection operation to the self-sustaining operation, and the operation of the grid interconnection inverter device 1 is switched from the interconnection operation to the self-sustaining operation. As a result, the grid interconnection inverter device 1 starts self-sustaining operation, and the resident can utilize the electric power obtained by the DC power supply 83 even if a power failure occurs in the electric power system 81.

As described above, the grid interconnection inverter device 1 according to the first embodiment determines whether or not a power failure has occurred in the power system 81 based on the detection result obtained by the first voltage detection unit 11, and determines whether or not a power failure has occurred in the power system 81. When it is determined that a power failure has occurred in 81, the interconnection operation is stopped, and it is determined whether or not the transition from the interconnection operation to the independent operation is possible. When the grid interconnection inverter device 1 determines that the transition from the interconnection operation to the independent operation is possible, it is a reminder to urge the operation of the grid interconnection inverter device 1 to be switched from the interconnection operation to the independent operation. Information is notified to the information terminal device 85 external to the grid interconnection inverter device 1. Therefore, the grid interconnection inverter device 1 can urge the resident to switch from the interconnection operation to the independent operation when a power failure occurs in the power system 81. As a result, the resident can switch the operation of the grid interconnection inverter device 1 from the interconnection operation to the independent operation, and by connecting the load 82 to the independent outlet 84, the electric power obtained by the DC power supply 83 is loaded. It can be supplied to 82.

When the notification unit 17 notifies the information terminal device 85 of the reminder information, the control unit 16 informs the notification unit 17 of the amount of power generated by the grid interconnection inverter device 1 immediately before determining that a power failure has occurred in the power system 81. The information terminal device 85 is notified of the indicated electric energy information. When the information terminal device 85 receives the power amount information and notifies the power amount information by sound or image, the resident can recognize the load 82 that can be connected to the self-sustaining outlet 84.

Embodiment 2.
FIG. 3 is a diagram showing the configuration of the grid interconnection inverter device 1A according to the second embodiment. The grid interconnection inverter device 1A includes a power conversion unit 2, a first terminal 3, a second terminal 4, a switch for interconnection operation 5, a third terminal 6, and the grid interconnection inverter device 1 according to the first embodiment. 4th terminal 7, switch for self-sustaining operation 8, 5th terminal 9, 6th terminal 10, 1st voltage detection unit 11, 2nd voltage detection unit 12, 3rd voltage detection unit 13, 4th voltage detection unit 14, It has a current detection unit 15 and a storage unit 18. The grid interconnection inverter device 1A has a control unit 16A in place of the control unit 16 of the grid interconnection inverter device 1, and has a notification unit 17A in place of the notification unit 17 of the grid interconnection inverter device 1. The control unit 16A has a storage unit 18 like the control unit 16. In the second embodiment, the differences from the first embodiment will be mainly described.

The grid interconnection inverter device 1A is connected to the HEMS (Home Energy Management System) controller 86. The HEMS controller 86 is connected to the Internet 87 and the remote controller 88. The remote controller 88 is a device operated by the resident, and controls the HEMS controller 86 based on the operation by the resident. The HEMS controller 86 controls the grid interconnection inverter device 1A based on the control by the remote controller 88. The remote controller 88 has a display device 89. FIG. 3 also shows the HEMS controller 86, the Internet 87, the remote controller 88 and the display device 89.

The control unit 16A determines whether or not a power failure has occurred in the power system 81 based on the detection result obtained by the first voltage detection unit 11, and if it is determined that a power failure has occurred in the power system 81, the interconnection unit 16A is interconnected. Stop the operation and judge whether it is possible to shift from the interconnection operation to the independent operation. When the control unit 16A determines that the transition from the interconnection operation to the independent operation is possible, the information is urging the notification unit 17A to switch the operation of the grid interconnection inverter device 1A from the interconnection operation to the independent operation. A certain reminder information is notified to the outside of the grid interconnection inverter device 1A. Specifically, when the control unit 16A determines that the transition from the interconnection operation to the independent operation is possible, the control unit 16A causes the notification unit 17A to notify the display device 89 of the reminder information. Furthermore, the control unit 16A causes the notification unit 17A to notify the display device 89 of the remote controller 88 of the reminder information via the HEMS controller 86. When the notification unit 17A notifies the display device 89 of the reminder information, the control unit 16A determines that the electric energy information stored in the storage unit 18 in the notification unit 17A and that a power failure has occurred in the power system 81. The display device 89 is notified of the electric energy information indicating the electric energy generated in the grid interconnection inverter device 1A of the above.

FIG. 4 is a flowchart showing a procedure of a part of the operation performed by the grid interconnection inverter device 1A according to the second embodiment. The control unit 16A determines whether or not the independent operation prevention function of the grid interconnection inverter device 1A has been operated due to the power failure generated in the power system 81 (S11). When the control unit 16A determines that the independent operation prevention function is not operating (No in S11), the control unit 16A performs the operation in step S11. When the control unit 16A determines that the independent operation prevention function has been operated (Yes in S11), the control unit 16A stores information indicating the amount of power generated by the grid interconnection inverter device 1A immediately before the operation of the grid interconnection inverter device 1A is stopped. It is stored in the unit 18 (S12). In step S12, the control unit 16A also stores in the storage unit 18 a list of loads 82 that can be connected to the independent outlet 84 when the independent operation is performed. The control unit 16A performs the operation of step S12 in order to make the resident recognize the load 82 that can be connected to the self-sustaining outlet 84 when the self-sustaining operation is performed.

The control unit 16A determines whether or not the first voltage detection unit 11 can detect the voltage (S13). Further, in step S13, the control unit 16A determines whether or not the first voltage detection unit 11 can detect the voltage when the power system 81 does not have a power failure. When the control unit 16A determines that the first voltage detection unit 11 can detect the voltage (Yes in S13), the control unit 16A performs the operation of step S11. When the control unit 16A determines that the first voltage detection unit 11 cannot detect the voltage (No in S13), the operation of the grid interconnection inverter device 1 can shift from the interconnection operation to the independent operation. Is output to the notification unit 17A (S14).

Based on the information output from the control unit 16A, the notification unit 17A provides information indicating that the operation of the grid interconnection inverter device 1A can shift from the interconnection operation to the independent operation via the HEMS controller 86. Notify the display device 89 of the remote controller 88 (S15). In step S15, the notification unit 17A provides information indicating the amount of power generated by the grid interconnection inverter device 1A immediately before the operation of the grid interconnection inverter device 1A is stopped, and a list of loads 82 that can be connected to the independent outlet 84. Notify the display device 89.

The display device 89 receives information indicating that the operation of the grid interconnection inverter device 1A can shift from the interconnection operation to the independent operation, and displays the information. As a result, the resident recognizes that the operation of the grid interconnection inverter device 1A can be switched from the interconnection operation to the self-sustaining operation, and switches the operation of the grid interconnection inverter device 1A from the interconnection operation to the self-sustaining operation. As a result, the grid interconnection inverter device 1A starts to operate independently, and the resident can utilize the electric power obtained by the DC power supply 83 even if a power failure occurs in the electric power system 81. The display device 89 displays information indicating the amount of generated power and a list of loads 82 that can be connected to the self-supporting outlet 84. As a result, the resident can recognize the load 82 that can be connected to the self-supporting outlet 84.

Since the HEMS controller 86 is connected to the Internet 87 and the remote controller 88, the display device 89 included in the remote controller 88 is provided with the grid interconnection inverter device 1A via the Internet 87 and the HEMS controller 86. It is possible to acquire the weather information of the area where the vehicle is located and display the weather information.

As described above, when the grid interconnection inverter device 1A according to the second embodiment determines that a power failure has occurred in the power system 81 and determines that the transition from the interconnection operation to the independent operation is possible, the grid interconnection is performed. The reminder information, which is information for urging the operation of the system inverter device 1A to be switched from the interconnection operation to the independent operation, is notified to the external display device 89 of the system interconnection inverter device 1A. Therefore, the grid interconnection inverter device 1A can urge the resident to switch from the interconnection operation to the independent operation when a power failure occurs in the power system 81. As a result, the resident can switch the operation of the grid interconnection inverter device 1A from the interconnection operation to the independent operation, and by connecting the load 82 to the independent outlet 84, the electric power obtained by the DC power supply 83 is utilized. The power can be supplied to the load 82.

FIG. 5 shows a first voltage detection unit 11, a second voltage detection unit 12, a third voltage detection unit 13, a fourth voltage detection unit 14, and a current detection unit 15 included in the grid interconnection inverter device 1 according to the first embodiment. , Is a diagram showing the processor 91 when at least a part of the control unit 16 and the notification unit 17 is realized by the processor 91. That is, at least a part of the functions of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17 are It may be realized by the processor 91 that executes the program stored in the memory 92. The processor 91 is a CPU (Central Processing Unit), a processing unit, an arithmetic unit, a microprocessor, or a DSP (Digital Signal Processor). FIG. 5 also shows the memory 92.

The processor 91 has at least a part of the functions of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17. When realized by, the function of at least a part thereof is realized by the processor 91 and software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 92. By reading and executing the program stored in the memory 92, the processor 91 reads out and executes the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, and the current detection unit. 15. Realizes at least a part of the functions of the control unit 16 and the notification unit 17.

At least a part of the functions of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17 are performed by the processor 91. When realized, the grid interconnection inverter device 1 includes a first voltage detection unit 11, a second voltage detection unit 12, a third voltage detection unit 13, a fourth voltage detection unit 14, a current detection unit 15, a control unit 16, and the like. It has a memory 92 for storing a program for which at least a part of the steps executed by the notification unit 17 will be executed as a result. The program stored in the memory 92 includes a first voltage detection unit 11, a second voltage detection unit 12, a third voltage detection unit 13, a fourth voltage detection unit 14, a current detection unit 15, a control unit 16, and a notification unit 17. It can also be said to cause a computer to perform at least a part of the procedure or method to be executed.

The memory 92 is, for example, non-volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EEPROM (Erasable Programmable Read Only Memory), EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory). Alternatively, it may be a volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disk), or the like.

FIG. 6 shows a first voltage detection unit 11, a second voltage detection unit 12, a third voltage detection unit 13, a fourth voltage detection unit 14, and a current detection unit 15 included in the grid interconnection inverter device 1 according to the first embodiment. , Is a diagram showing a processing circuit 93 when at least a part of the control unit 16 and the notification unit 17 is realized by the processing circuit 93. That is, at least a part of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17 is a processing circuit. It may be realized by 93.

The processing circuit 93 is dedicated hardware. The processing circuit 93 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Is.

A part of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17 are dedicated separately from the rest. It may be realized by the hardware of.

The plurality of functions of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17 are the plurality of functions. A part of the above may be realized by software or firmware, and the rest of the plurality of functions may be realized by dedicated hardware. As described above, the plurality of functions of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16, and the notification unit 17 are combined. It can be achieved by hardware, software, firmware, or a combination thereof.

First voltage detection unit 11, second voltage detection unit 12, third voltage detection unit 13, fourth voltage detection unit 14, current detection unit 15, control unit 16A included in the grid interconnection inverter device 1A according to the second embodiment. And at least a part of the functions of the notification unit 17A may be realized by a processor that executes a program stored in the memory. The memory is the same memory as the memory 92, and the processor is the same processor as the processor 91. At least of the first voltage detection unit 11, the second voltage detection unit 12, the third voltage detection unit 13, the fourth voltage detection unit 14, the current detection unit 15, the control unit 16A, and the notification unit 17A of the grid interconnection inverter device 1A. Some may be realized by a processing circuit. The processing circuit is the same processing circuit as the processing circuit 93.

The configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.

1,1A grid interconnection inverter device, 2 power converter, 3 1st terminal, 4th terminal, 5 interconnection operation switch, 6 3rd terminal, 7 4th terminal, 8 self-sustaining operation switch, 9 5th terminal, 10th terminal, 11 1st voltage detection unit, 12 2nd voltage detection unit, 13 3rd voltage detection unit, 14 4th voltage detection unit, 15 current detection unit, 16, 16A control unit, 17, 17A Notification unit, 18 Storage unit, 21 Converter circuit unit, 22 Inverter circuit unit, 23 1st DC bus, 24 2nd DC bus, 25 Filter circuit, 31 1st capacitor, 32 2nd capacitor, 33 1st reactor, 34 1st switching element, 35 diode, 36 2nd switching element, 37 3rd switching element, 38 4th switching element, 39 5th switching element, 40 2nd reactor, 41 3rd reactor, 42 3rd capacitor, 81 power System, 82 load, 83 DC power supply, 84 self-contained outlet, 85 information terminal equipment, 86 HEMS controller, 87 Internet, 88 remote controller, 89 display device, 91 processor, 92 memory, 93 processing circuit.

Claims (5)

When there is no power failure in the power system, interconnection operation is performed to supply the AC power supplied from the power system to the load, and when a power failure occurs in the power system, the load and the power system are connected. It is a grid interconnection inverter device having a function of performing independent operation to supply AC power based on DC power supplied from a DC power supply to the load in a non-powered state.
A first voltage detection unit that detects the voltage of AC power supplied from the power system to the grid interconnection inverter device, and
A notification unit that notifies information to the outside of the grid interconnection inverter device, and
Based on the detection result obtained by the first voltage detection unit, it is determined whether or not a power failure has occurred in the power system, and if it is determined that a power failure has occurred in the power system, the interconnection operation is stopped. When it is determined whether or not the transition from the interconnection operation to the self-sustaining operation is possible and it is determined that the transition from the interconnection operation to the self-sustaining operation is possible, the notification unit is notified of the system. A grid interconnection characterized by comprising a control unit for notifying the outside of the grid interconnection inverter device of reminder information which is information for urging the operation of the interconnection inverter device to be switched from the interconnection operation to the self-sustaining operation. Inverter device. The grid interconnection inverter device according to claim 1, wherein the notification unit notifies the information terminal device outside the grid interconnection inverter device of the reminder information. The control unit
It has a storage unit for storing electric energy information which is information indicating the electric energy generated in the grid interconnection inverter device immediately before it is determined that a power failure has occurred in the electric power system.
The second aspect of claim 2, wherein when the notification unit notifies the information terminal device of the reminder information, the notification unit notifies the information terminal device of the power amount information stored in the storage unit. Described grid interconnection inverter device. The grid interconnection inverter device according to claim 1, wherein the notification unit notifies the reminder information to a display device external to the grid interconnection inverter device. The control unit
It has a storage unit for storing electric energy information which is information indicating the electric energy generated in the grid interconnection inverter device immediately before it is determined that a power failure has occurred in the electric power system.
The fourth aspect of claim 4, wherein when the notification unit notifies the display device of the reminder information, the notification unit notifies the display device of the electric energy amount information stored in the storage unit. Grid interconnection inverter device.

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