JP7380598B2 - Power control device, mobile object, and power control method - Google Patents

Description

The present disclosure relates to a power control device, a mobile object, and a power control method.

In recent years, power supply systems equipped with power conditioners and storage batteries have become popular. In such power supply systems, for example, DC power generated by solar cells, fuel cells, cogeneration systems, etc. is converted into AC power, and the converted power is then supplied to loads (power-using devices). The electricity is charged to storage batteries and sold to the grid (commercial power grid). Further, in such a power supply system, for example, by charging a storage battery with nighttime power, which has a low power unit price, it becomes possible to use the charging power in the morning or evening. Moreover, in such a storage battery system, it becomes possible to use the power charged in the storage battery during normal times when power is no longer supplied from the grid due to a power outage or the like.

An example of a document disclosing such a power supply system is Patent Document 1.

Japanese Patent Application Publication No. 2018-152959

However, in such power supply systems, there has been no mechanism in place that allows power conditioners to directly supply power from storage batteries as alternating current power when the power supply stops or becomes unstable due to a system failure.

Therefore, the present disclosure provides a new and improved power control device that can directly supply power from a storage battery to the grid as AC power using a power conditioner when power is not supplied or becomes unstable due to a fault in the grid. and a power control method.

According to the present disclosure, the first mode operates based on the frequency of AC power from a grid line that supplies AC power, or the second mode operates by limiting the current from the grid line and autonomously controlling the frequency. an inverter that operates as a master mode that determines the frequency and voltage of AC power output to the grid line when the mode switching unit switches to the second mode; A power control device is provided.

Further, according to the present disclosure, in a state where power supply from a grid line that supplies AC power is stable, the first mode operates based on the frequency of AC power from the grid line, or from the grid line. switching one of the second modes in which the current from the grid line is limited and the frequency autonomously operates in a state where the power supply is unstable; and when switching to the second mode, the grid line A power control method is provided comprising: operating an inverter in a master mode to determine the frequency and voltage of power output to a power line.

FIG. 1 is an explanatory diagram showing an example of a functional configuration of a power conditioner with a storage battery 100 according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram showing an example of a functional configuration of an inverter control circuit 110 according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram showing an example of a functional configuration of a voltage detection outlet 230 according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram showing an example in which power conditioners with storage batteries are connected in multiple stages. FIG. 1 is an explanatory diagram showing a configuration example of a power supply system according to an embodiment of the present disclosure. It is an explanatory view showing operation modes and transition conditions of power conditioner 100 with a storage battery. It is a flow chart showing an example of the operation of the controller 300 according to the embodiment of the present disclosure. It is an explanatory view showing an example of a change of current and voltage at the time of mode switching of power conditioner 100 with a storage battery. It is an explanatory view showing an example of a change of current and voltage at the time of mode switching of power conditioner 100 with a storage battery. FIG. 2 is an explanatory diagram showing a configuration example of an inter-vehicle power supply system.

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that, in this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals and redundant explanation will be omitted.

Note that the explanation will be given in the following order.
1. Embodiments of the present disclosure 1.1. Background 1.2. System configuration example 1.3. Operation example 1.4. Application example 2. summary

<1. Embodiments of the present disclosure>
[1.1. background]
Before describing the embodiments of the present disclosure in detail, the circumstances leading to the embodiments of the present disclosure will first be explained.

A power conditioner without a storage battery constantly monitors the voltage of the grid (commercial power grid) and disconnects from the grid via a relay if the voltage of the grid deviates from a certain range. Such a power conditioner is not directly connected to an electrical device serving as a load, but measures the amount of electricity sold through a power meter. Moreover, such a power conditioner has a structure in which it is connected from the grid side via a power meter for power purchase. In such a case, if the power grid goes out, the electrical equipment will also stop working.

Power conditioners with storage batteries are set to not have reverse power flow, so there is no need to disconnect them from the grid even if the grid becomes abnormal. However, such power conditioners stop the output when the power in the grid becomes abnormal, making it impossible to supply power to the connected electrical equipment, and the structure is such that a limited small amount of power is supplied from a separate output. There is. Therefore, electrical equipment normally connected to a power conditioner with a storage battery cannot receive power and stops when there is an abnormality in the grid.

A power conditioner with a storage battery can have a reverse power flow restriction function. However, such a power conditioner cannot mix purchased power and sold power with the power of the storage battery. Therefore, the power flows in reverse depending on the amount of power generated by a generator such as a solar power generator installed in the power conditioner, and there may be a situation in which it is not possible to limit the amount of power flowing, resulting in a significant change in the amount of power generated, and The system to which the conditioner is connected may become unstable.

If there is a problem with the main grid and some of the grid lines are disconnected from the main grid, the power conditioners connected to the disconnected grid lines will have no voltage source. Therefore, if the power conditioner has a storage battery, it will operate independently using the power of the storage battery. Therefore, if the power stored in the storage battery is consumed, not only the electrical equipment connected to the power conditioner but also the power conditioner itself will stop.

Therefore, in view of the above-mentioned points, the Discloser has been working diligently to develop a technology that allows power conditioners to directly supply power from storage batteries to the grid as AC power when power supply stops or becomes unstable due to grid failure. Study was carried out. As a result, as explained below, the Discloser has developed a power conditioner that can directly supply power from the storage battery to the grid as AC power when the power supply stops or becomes unstable due to a fault in the grid. I came up with an idea.

[1.2. System configuration example]
Next, a configuration example of a power conditioner according to an embodiment of the present disclosure will be described. FIG. 1 is an explanatory diagram showing an example of the functional configuration of a power conditioner with a storage battery 100 according to an embodiment of the present disclosure. Hereinafter, an example of the functional configuration of a power conditioner with a storage battery 100 according to an embodiment of the present disclosure will be described using FIG. 1.

As shown in FIG. 1, a power conditioner with a storage battery 100 according to an embodiment of the present disclosure includes an inverter control circuit 110, a power control circuit 120, a grid cooperation relay 130, and a storage battery 140. be done.

The inverter control circuit 110 is a device that converts the battery stored in the storage battery 140 from DC power to AC power for use in the loads 210 and 220 connected to the power conditioner 100 with storage battery. In this embodiment, inverter control circuit 110 has multiple operation modes. In this embodiment, the inverter control circuit 110 has a current control mode and a voltage control mode. Furthermore, in this embodiment, the inverter control circuit 110 has a frequency heteronomous mode and a frequency autonomous mode. The inverter control circuit 110 has a switching function between a current control mode and a voltage control mode, and a switching function between a frequency heteronomous mode and a frequency autonomous mode. Inverter control circuit 110 receives an instruction from power control circuit 120 via input terminal io1 and switches these modes. The inverter control circuit 110 also has a function of monitoring the voltage vg and frequency fg of the AC system via the si2 terminal, and notifying the power control circuit 120 of the status of the voltage vg and frequency fg of the AC system via the terminal io1. have

The power control circuit 120 obtains the state of charge (soc) of the storage battery 140 and notifies it to other systems via the communication line COM, or controls the operation of the inverter control circuit 110 based on instructions from other systems. Perform actions such as switching modes. The power control circuit 120 also drives the grid linkage relay 130 to perform an operation of linking the power conditioner 100 with a storage battery to the grid line G1.

The power conditioner 100 with a storage battery has three operation modes as a whole. The three operating modes are grid-coupled frequency heteronomous current control mode, grid-uncoupled frequency autonomous voltage control mode, and grid-coupled frequency autonomous voltage control mode. The power control circuit 120 determines the operation mode of the power conditioner 100 with a storage battery based on the state of charge of the storage battery 140, the voltage and frequency status of the AC system sent from the inverter control circuit 110, and instructions from the communication line. , change the voltage/current control amount, and switch the grid cooperation relay 130.

The power of the power control circuit 120 is connected to the terminal p1 from a portion where the system line G1 and the system cooperation relay 130 are connected, is converted into a direct current, and is supplied to the internal circuit via a diode. Further, the power for the power control circuit 120 is also connected to the terminal p2 from the storage battery 140, and similarly supplied to the internal circuit via the diode. As a result, the power control circuit 120 can be activated using grid power even when the storage battery 140 runs out of power. Furthermore, even in the island mode, which will be described later, the power for the power control circuit 120 is supplied from the storage battery 140.

In the grid non-cooperated frequency autonomous voltage control mode, when the SOC of the storage battery 140 decreases, the power control circuit 120 lowers the control voltage by a predetermined amount to gradually reduce the power consumption of the loads 210 and 220.

The loads 210 and 220 receive power from the power conditioner 100 with a storage battery. Load 220 is connected via voltage sensing outlet 230. The voltage detection outlet 230 has a function of cutting off the power supplied to the load 220 when detecting the occurrence of a voltage drop in the inverter control circuit 110.

The functional configuration example of the power conditioner with storage battery 100 according to the embodiment of the present disclosure has been described above using FIG. 1 . Next, an example of the functional configuration of the inverter control circuit 110 will be described.

FIG. 2 is an explanatory diagram showing an example of the functional configuration of the inverter control circuit 110 according to the embodiment of the present disclosure. Hereinafter, an example of the functional configuration of the inverter control circuit 110 according to the embodiment of the present disclosure will be described using FIG. 2.

As shown in FIG. 2, the inverter control circuit 110 according to the embodiment of the present disclosure includes a bidirectional AC/DC inverter 111, a voltage/frequency monitor 112, a reference signal output section 113, and a mode switching current instruction section. 114 and an operational amplifier 115.

The bidirectional AC/DC inverter 111 is an inverter capable of converting alternating current to direct current and converting direct current to alternating current. The voltage/frequency monitor 112 monitors the voltage and frequency of the AC system when the switch sw1 is tilted toward the terminal si2. If an abnormality occurs in the voltage and frequency of the AC system, the voltage/frequency monitor 112 notifies the mode switching current instruction unit 114 of this fact.

The mode switching current instruction unit 114 instructs the bidirectional AC/DC inverter 111 to change the operating mode and switches the switch sw1. The operational amplifier 115 compares the current instruction value passed through the terminal io1 and the current signal from the terminal si3, and outputs the comparison result to the bidirectional AC/DC inverter 111.

In the island mode and master mode, which will be described later, the mode switching current instruction section 114 turns the switch sw1 toward the reference signal output section 113 side. The reference signal Vac becomes the voltage/frequency input of the bidirectional AC/DC inverter 111, and the bidirectional AC/DC inverter 111 performs only AC in/out voltage control and does not perform current control. In the slave mode, which will be described later, the mode switching current instruction unit 114 turns the switch sw1 to the terminal si3 side, and the voltage/frequency monitor 112 monitors the voltage and frequency states of the AC system. The operational amplifier 115 then compares the current instruction value passed through the terminal io1 with the current signal from the terminal si3, and outputs the comparison result to the bidirectional AC/DC inverter 111. Performs current control.

The functional configuration example of the inverter control circuit 110 according to the embodiment of the present disclosure has been described above using FIG. 2. Next, an example of the functional configuration of the voltage detection outlet 230 according to the embodiment of the present disclosure will be described.

FIG. 3 is an explanatory diagram showing an example of the functional configuration of the voltage detection outlet 230 according to the embodiment of the present disclosure. Hereinafter, an example of the functional configuration of the voltage detection outlet 230 according to the embodiment of the present disclosure will be described using FIG. 3.

As shown in FIG. 3, voltage detection outlet 230 according to the embodiment of the present disclosure includes a voltage detector 231 and a relay 232.

Voltage detector 231 detects the input voltage of voltage detection outlet 230. If the input voltage of the voltage detection outlet 230 is a predetermined normal voltage, the voltage detector 231 turns on the relay 232 to connect the input and output of the voltage detection outlet 230. On the other hand, when the input voltage of the voltage detection outlet 230 falls from a predetermined normal voltage, the voltage detector 231 turns off the relay 232 to cut off the input and output of the voltage detection outlet 230.

The voltage detection outlet 230 has such a configuration, so that when the output voltage of the inverter control circuit 110 decreases due to a decrease in the power amount of the storage battery 140, the load (load 220) connected to the end of the voltage detection outlet 230 power supply can be interrupted. On the other hand, an important load (for example, load 210) that can operate even at a low voltage can continue to operate even when the output voltage of inverter control circuit 110 decreases due to a decrease in the amount of power of storage battery 140.

Note that the system cooperation relay 130 and the relay 232 may be electromagnetic relays, or may be configured with semiconductor relays (SSR) or thyristors.

The functional configuration example of the voltage detection outlet 230 according to the embodiment of the present disclosure has been described above using FIG. 3. Although FIG. 1 shows a configuration example in which only one power conditioner 100 with a storage battery is provided, the present disclosure is not limited to such an example. For example, as shown in FIG. 4, a multistage connection in which a load 210 and a power conditioner with a storage battery 100b are connected to the power conditioner with a storage battery 100a, and a load 220 is connected to the end of the power conditioner with a storage battery 100b. is also possible.

For example, by handling the load 220 whose power consumption fluctuates sharply with the power conditioner 100b with a storage battery in the lower layer, it is possible to prevent the peak of the layer and the peak of the upper layer from overlapping and exceeding the supply capacity of the power conditioner. I can do it.

When the load 210 and the load 220 operate simultaneously, if the supply capacity of one power conditioner with a storage battery is exceeded, the fluctuation in the power consumption of the load 210 is absorbed by the power conditioner with a storage battery 100a, and the power consumption of the load 220 is reduced. The leveled power request by the power conditioner with storage battery 100b is supplied by the power conditioner with storage battery 100a. The hierarchical structure shown in FIG. 4 makes it possible to avoid excess power consumption during peak hours.

By connecting a plurality of power conditioners 100 with storage batteries shown in FIG. 1 in parallel, power can be exchanged between the power conditioners 100 with storage batteries.

FIG. 5 is an explanatory diagram showing a configuration example of a power supply system according to an embodiment of the present disclosure. FIG. 5 shows a configuration example of the power supply system 1 in which four power conditioners 100a to 100d with storage batteries are connected to the branch line G2.

The input/output terminals of the power conditioners with storage batteries 100a to 100d are connected to the branch line G2. Furthermore, the power conditioners 100a to 100d with storage batteries are each connected to one controller 300 through a communication line COM. Furthermore, power output terminals PO1 to PO4 of the power conditioners with storage batteries 100a to 100d are connected to a plurality of loads.

The switch GSW1 is a switch that connects the system line G1 and the branch line G2. When an abnormality occurs in the system line G1, the switch GSW1 disconnects the system line G1 and the branch line G2. When the branch line G2 is connected to the system line G1 by the switch GSW1, each power conditioner with storage battery 100a to 100d operates in island mode or slave mode. When there is sufficient power in the storage battery (for example, 40% or more remaining power), the power conditioners 100a to 100d with storage batteries enter the island mode. On the other hand, when the power of the storage battery is insufficient, the power conditioners 100a to 100d with storage batteries enter a slave mode, and charge the storage battery while receiving power from the grid, or supply power to the load together with the power of the storage battery.

If there is an abnormality in the voltage or frequency of the grid line G1, each power conditioner with storage battery 100a to 100d is disconnected from the branch line G2 and switched to island mode (IM). When the abnormality in the voltage or frequency of the system line G1 is prolonged, the switch GSW1 is turned off and the branch line G2 is disconnected from the system line G1. This switch GSW1 can be turned on and off by, for example, a business that supplies power through the grid line G1. When the controller 300 confirms that the switch GSW1 is turned off and the branch line G2 is disconnected from the system line G1, the controller 300 selects one of the power conditioners with storage batteries 100a to 100d and installs the selected power conditioner with the storage battery. Instructs the conditioner to enter master mode (MM). Here, it is assumed that the power conditioner with storage battery 100c is selected to be in the master mode. Which power conditioner with a storage battery is selected as the master mode is not limited to a specific example, but, for example, the one with the highest remaining amount of storage battery may be selected as the master mode.

The power conditioner 100c with a storage battery in the master mode controls the voltage and frequency of the branch line G2 to predetermined values. Here, it is assumed that the power conditioner with storage battery 100c sets the voltage of the branch line G2 to 100V and the frequency to 50Hz. The voltage and frequency values of the branch line G2 can be set according to the performance of other power conditioners with storage batteries 100.

The controller 300 communicates with each of the battery-equipped power conditioners 100a to 100d, switches the storage battery-equipped power conditioners capable of power flexibility to slave mode (SM), and sets respective current control values. The power conditioner with a storage battery switched to the slave mode exchanges electric power with other power conditioners with a storage battery.

In the example of FIG. 5, the power conditioner 100a with a storage battery supplies 2 amperes of power to the branch line G2, and the power conditioner 100d with a storage battery receives 2 amperes of power. Moreover, the power conditioner 100b with a storage battery receives power of 3 amperes, and the power conditioner 100c with a storage battery supplies power of 2 amperes.

[1.3. Operation example]
FIG. 6 is an explanatory diagram showing operation modes and transition conditions of the power conditioner with storage battery 100. Hereinafter, the operation mode and transition conditions of the power conditioner with storage battery 100 will be explained using FIG. 6.

(Transition from stop mode)
When the power conditioner 100 with a storage battery in the stop mode receives power from the grid or power from the storage battery, it starts and operates in the island mode.

(Island mode)
In the island mode, the power conditioner 100 with a storage battery is in the island mode, the grid connection relay 130 that connects the grid line and the inverter control circuit 110 is off, the frequency of AC power is generated internally, and the terminals of the inverter control circuit 110 are generated internally. The control voltage of pio1 is set by an instruction from the power control circuit 120. The inverter control circuit 110 checks the SOC value of the storage battery 140 and determines the output voltage of the terminal pio1.

(Transition from island mode)
In the island mode state, the power conditioner 100 with a storage battery monitors the voltage vg and frequency fg of the grid line G1, and determines whether the voltage vg and frequency fg are within a predetermined appropriate range and the power control circuit 120 is in the slave mode transition permission state. For example, it transitions to slave mode. Further, in the island mode state, the power conditioner 100 with a storage battery transitions to the master mode if the SOC value of the storage battery 140 is a predetermined value or more and the power control circuit 120 is in the master mode transition permission state.

(slave mode)
In the slave mode state of the power conditioner 100 with a storage battery, the grid linkage relay 130 that connects the grid line and the inverter control circuit 110 is on, the frequency is synchronized with the grid line, and the output of the terminal pio1 is the power The current control mode is set by an instruction from the control circuit 120.

(Transition from slave mode)
The power conditioner 100 with a storage battery monitors the voltage vg and frequency fg of the grid line G1 in the slave mode, and changes to the island mode when the voltage vg and frequency fg deviate from a predetermined appropriate range for a predetermined time. Moreover, the power conditioner 100 with a storage battery changes to the island mode or the master mode in response to an instruction from the power control circuit 120 in the slave mode state.

(Master mode)
In the master mode state of the power conditioner 100 with a storage battery, the grid cooperation relay 130 that connects the grid line and the inverter control circuit 110 is on, the frequency of AC power is generated internally, and the output of the terminal pio1 is the power The voltage control mode is set by an instruction from the control circuit 120.

(Transition from master mode)
In the master mode, the power conditioner 100 with a storage battery transitions to the slave mode or the island mode according to an instruction from the power control circuit 120.

FIG. 7 is a flowchart illustrating an example of the operation of the controller 300 according to the embodiment of the present disclosure. The operation of the controller 300 in FIG. 7 is based on the configuration shown in FIG. 5. Hereinafter, an example of the operation of the controller according to the embodiment of the present disclosure will be described using FIG. 7.

When the controller 300 starts operating, it obtains information (BSPC information) about the power conditioner 100 with a storage battery connected to the communication line (step S101). Subsequently, the controller 300 determines whether the switch GSW1 is turned off (step S102).

As a result of the determination in step S102, if the switch GSW1 is turned off (step S102, Yes), the controller 300 selects one of the power conditioners with storage batteries 100a to 100d, and selects one of the power conditioners with the selected storage battery. The power conditioner is set to master mode (step S103). Here, the power conditioner with storage battery (BSPC) with the largest amount of stored electricity is set to the master mode. As a result of the determination in step S102, if the switch GSW1 is turned on (step S102, No), the controller 300 skips the process of step S103.

Next, the controller 300 determines whether there is a power request from at least one of the power conditioners 100a to 100d with storage batteries (step S104).

As a result of the determination in step S104, if there is a power request from at least one of the storage battery-equipped power conditioners 100a to 100d (step S104, Yes), the controller 300 places the requested storage battery-equipped power conditioner in slave mode. Furthermore, a power conditioner with a storage battery that has a large remaining amount of storage battery and is capable of supplying power is set to slave mode, and mutual current amounts are set to be the same between positive and negative amounts, thereby accommodating a specified amount of electric power (step S105). After that, the controller 300 returns to the process of step S101.

On the other hand, if the controller 300 determines in step S104 that there is no power request from any of the battery-equipped power conditioners 100a to 100d (step S104, No), the process returns to step S101.

FIG. 8 is an explanatory diagram showing an example of changes in current and voltage when switching modes of the power conditioner 100 with a storage battery.

Until time t1, the power conditioner 100 with a storage battery operates in the island mode. At time t1, the grid cooperation relay 130 of the power conditioner 100 with a storage battery is turned on, and at time t2, the power conditioner 100 with a storage battery operates in slave mode and performs charging at 5 amperes. Therefore, the current ir1 of the inverter control circuit 110 has a negative value.

Thereafter, at time t3, the power conditioner 100 with a storage battery operates in slave mode and discharges from the storage battery at 3 amperes. Therefore, the current ir1 of the inverter control circuit 110 has a positive value.

After that, at time t4, an abnormality occurs in the grid line G1, and the voltage of the grid drops. The power conditioner 100 with a storage battery turns off the grid cooperation relay 130 and operates in island mode. Further, when the switch GSW1 is turned off due to an abnormality in the grid line G1, the voltage of the grid becomes 0V.

Thereafter, at time t5, the power conditioner 100 with a storage battery is set to master mode by the controller 300. The power conditioner 100 with a storage battery set to the master mode performs power interchange with other power conditioners 100 with a storage battery connected to the branch line G2.

[1.4. Application example]
It is also possible to mount the inverter control circuit 110 according to the embodiment of the present disclosure on a moving object such as a car. FIG. 9 is an explanatory diagram showing a modification of the embodiment of the present disclosure. FIG. 9 shows an example in which an inverter control circuit 110 is mounted on an automobile 10. The inverter control circuit 110 can receive power from the grid line G1 via the interface 20 that connects the vehicle 10 and the grid line G1, and can supply power to the grid line G1. The inverter control circuit 110 is also connected to a communication section 150 that performs communication with the outside, and can exchange information with other inverter control circuits 110 via the communication section 150.

FIG. 10 is an explanatory diagram showing a configuration example of an inter-vehicle power supply system. FIG. 10 shows two automobiles 10a and 10b equipped with an inverter control circuit 110. The automobiles 10a and 10b are each connected to a controller 300, and similarly to the power supply system shown in FIG. 5, it is possible to exchange electric power between the automobiles 10a and 10b. In addition, in the application examples shown in FIGS. 9 and 10, as shown in FIG. 5, by connecting to the branch line G2 instead of the grid line G1, it is possible to receive power from the branch line G2. , or may supply power to the branch line G2.

<2. Summary＞
As described above, according to the embodiment of the present disclosure, a storage battery is configured to be disconnected from the grid line so that when power is not supplied or becomes unstable due to a failure in the power grid, the power of the storage battery can be supplied as AC power. A power conditioner 100 is provided. The power conditioner 100 with a storage battery according to the embodiment of the present disclosure has a structure that allows power to be directly supplied from the storage battery to an electrical device serving as a load.

The power conditioner 100 with a storage battery according to the embodiment of the present disclosure reduces the output voltage by a certain amount when the grid line is disconnected and only the storage battery is supplied, and the capacity of the storage battery becomes below a certain level. The voltage detection outlet 230 that detects the voltage drop can cut off the power supply to the electrical equipment connected beyond it, so the power supply to the electrical equipment that consumes a large amount of power is automatically cut off, and the power supply to the electrical equipment that consumes a large amount of power is automatically cut off. Since it is possible to selectively operate only the lighting devices and electronic devices that require consumption, the power conditioner 100 with a storage battery according to the embodiment of the present disclosure can maintain an environment necessary for daily life even with a small amount of electric power.

The power conditioner 100 with a storage battery according to the embodiment of the present disclosure can be connected to or disconnected from the grid depending on the amount of electricity stored in the storage battery. Furthermore, when the power conditioner 100 with a storage battery according to the embodiment of the present disclosure is connected to the grid, it is possible to exchange a specific amount of current with the grid, so that the power conditioner 100 with a storage battery according to the embodiment of the present disclosure can exchange a specific amount of current with the grid. It is easy to balance supply with

The power conditioner 100 with a storage battery according to the embodiment of the present disclosure has three modes: island mode, slave mode, and master mode. When the power conditioner 100 with a storage battery according to the embodiment of the present disclosure is connected to the core system, the generator of the electric power company is used as the master power source, and the device is in slave mode to accommodate power, and from the core system. In the case of disconnection, one of the disconnected branch systems can be used as a master power source, so power can be exchanged in master mode and the others in slave mode, so power outages can be minimized.

Each step in the process executed by each device in this specification does not necessarily need to be processed chronologically in the order described as a sequence diagram or a flowchart. For example, each step in the process executed by each device may be processed in a different order from the order described in the flowchart, or may be processed in parallel.

Further, it is also possible to create a computer program for causing hardware such as a CPU, ROM, and RAM built into each device to perform functions equivalent to the configuration of each device described above. A storage medium storing the computer program may also be provided. Further, by configuring each functional block shown in the functional block diagram with hardware, a series of processing can be realized with hardware.

Although preferred embodiments of the present disclosure have been described above in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that a person with ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims, and It is understood that these also naturally fall within the technical scope of the present disclosure.

Further, the effects described in this specification are merely explanatory or illustrative, and are not limiting. In other words, the technology according to the present disclosure can have other effects that are obvious to those skilled in the art from the description of this specification, in addition to or in place of the above effects.

Note that the following configurations also belong to the technical scope of the present disclosure.
(1)
A mode for switching between a first mode that operates based on the frequency of AC power from a grid line that supplies AC power, or a second mode that operates by limiting the current from the grid line and autonomously controlling the frequency. a switching section;
an inverter that operates in a master mode that determines the frequency and voltage of AC power output to the grid line when the mode switching unit switches to the second mode;
A power control device comprising:
(2)
The power control device according to (1), wherein the inverter operates in the master mode based on an external instruction.
(3)
The power control device according to (2), further comprising a control unit that performs control to switch a connection between the grid line and the inverter.
(4)
The power control device according to (3), wherein the control unit controls to connect the grid line and the inverter when the inverter operates in master mode.
(5)
The inverter also operates in a slave mode in which it transfers power to and from the grid line according to a set frequency and voltage in either the first mode or the second mode. The power control device according to any one of (1) to (4).
(6)
In either the first mode or the second mode, the inverter also operates in an island mode in which the frequency of AC power is autonomous without receiving AC power from the grid line. The power control device according to any one of 1) to (5).
(7)
The power control device according to any one of (1) to (6), wherein the mode switching unit switches to the first mode in a state where power supply from the grid line is stable.
(8)
The power control device according to any one of (1) to (7), wherein the mode switching unit switches to the second mode when power supply from the grid line is unstable.
(9)
A mobile object comprising the power control device according to any one of (1) to (8) above.
(10)
The first mode operates based on the frequency of AC power from the grid line when the power supply from the grid line supplying AC power is stable, or the first mode operates based on the frequency of the AC power from the grid line when the power supply from the grid line is unstable. Switching one of the second modes in which the current from the grid line is limited and the frequency is autonomously operated;
When switching to the second mode, operating the inverter in a master mode that determines the frequency and voltage of power output to the grid line;
A power control method comprising:

1: Power supply system 10: Automobile 20: Interface 100: Power conditioner with storage battery 110: Inverter control circuit 111: Bidirectional AC/DC inverter 112: Frequency monitor 113: Reference signal output section 114: Mode switching current instruction section 115: Operational amplifier 120: Power control circuit 130: Grid cooperation relay 140: Storage battery 150: Communication unit 210: Load 220: Load 230: Voltage detection outlet 231: Voltage detector 232: Relay 300: Controller

Claims (9)

A power control device that is connected to a grid line and a power storage device that supplies AC power and supplies power to multiple loads,
A mode switching unit that switches between a first mode that operates based on the frequency of AC power from the grid line, or a second mode that operates by limiting the current from the grid line and autonomously controlling the frequency;
an inverter that operates in a master mode that determines the frequency and voltage of AC power output to the grid line when the mode switching unit switches to the second mode;
a control unit that performs control to switch a connection between the system line and the inverter;
is provided between a predetermined load of the plurality of loads and the power control device, detects a voltage from the power control device, and depending on the detected voltage, the predetermined load and the power control device a voltage-sensing outlet that can disconnect the connection between the
A power control device comprising: The power control device according to claim 1, wherein the inverter operates in the master mode based on an external instruction. The power control device according to claim 1 or 2 , wherein the control unit controls to connect the grid line and the inverter when the inverter operates in a master mode. The inverter, in either the first mode or the second mode, also operates in a slave mode for transferring power to and from the grid line according to a set frequency and voltage. The power control device according to any one of items 1 to 3 . 2. The inverter, in either the first mode or the second mode, also operates in an island mode in which the frequency of AC power is autonomous without receiving AC power from the grid line. 5. The power control device according to any one of 1 to 4 . The power control device according to any one of claims 1 to 5 , wherein the mode switching unit switches to the first mode in a state where power supply from the grid line is stable. The power control device according to claim 1, wherein the mode switching unit switches to the second mode when power supply from the grid line is unstable. A mobile object comprising the power control device according to claim 1. A power control device that is connected to grid lines and power storage devices that supply AC power, and supplies power to multiple loads.
The first mode operates based on the frequency of AC power from the grid line when the power supply from the grid line is stable, or from the grid line when the power supply from the grid line is unstable. switching one of the second modes in which the current is limited and the frequency is autonomously operated;
When switching to the second mode, operating the inverter in a master mode that determines the frequency and voltage of power output to the grid line;
switching the connection between the grid line and the inverter;
Detecting a voltage between the plurality of loads and a predetermined load, and cutting off the connection with the predetermined load according to the detected voltage;
A power control method , including :

Images