WO2020149081A1

WO2020149081A1 - Power control device, moving body, and power control method

Info

Publication number: WO2020149081A1
Application number: PCT/JP2019/049618
Authority: WO
Inventors: 直森田
Original assignee: ソニー株式会社
Priority date: 2019-01-15
Filing date: 2019-12-18
Publication date: 2020-07-23
Also published as: JPWO2020149081A1; JP7380598B2

Abstract

Provided is a power control device provided with: a mode switching unit for switching either a first mode which, in a state in which the power supply from a system line for supplying AC power is stable, operates on the basis of the frequency of the AC power from the system line or a second mode which, in a state in which the power supply from the system line is not stable, limits the current from the system line and performs autonomous frequency operation; and an inverter which, when the mode switching unit switches the mode to the second mode, operates as a master mode for determining the frequency and voltage of power output to the system line.

Description

Power control device, moving body, and power control method

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

In recent years, a power supply system equipped with a power conditioner and a storage battery has become widespread. In such a power supply system, for example, DC power generated by a solar cell, a fuel cell, a cogeneration system, or the like is converted into AC power, and then the converted power is supplied to a load (power usage equipment group). The battery and the storage battery are charged, and power is output to the grid (commercial power grid). Further, in such a power supply system, for example, by charging the storage battery with night power having a low power unit price, it is possible to use the charging power in the morning and the evening. Further, in such a storage battery system, it becomes possible to use the electric power charged in the storage battery in normal times when the electric power from the grid is not supplied due to a power failure or the like.

As a document disclosing such a power supply system, there is Patent Document 1, for example.

Japanese Patent Laid-Open No. 2018-152959

However, in such an electric power supply system, there was no mechanism that could supply the electric power of the storage battery as AC power as it is by the power conditioner when the electric power was not supplied or became unstable due to the grid failure.

Therefore, in the present disclosure, a new and improved power control device capable of directly supplying the power of a storage battery as AC power to a grid by a power conditioner when the power is not supplied or becomes unstable due to a grid failure. And a power control method is proposed.

According to the present disclosure, a first mode that operates based on the frequency of AC power from a system line that supplies AC power, or a second mode that limits the current from the system line and operates autonomously in frequency. A mode switching unit that switches any one of the above, and an inverter that operates as a master mode that determines the frequency and voltage of the AC power output to the system line when the mode switching unit switches to the second mode. A power controller is provided.

Further, according to the present disclosure, in a state where the power supply from the system line that supplies the AC power is stable, the first mode that operates based on the frequency of the AC power from the system line, or from the system line Switching between any of the second modes of operating the frequency autonomously by limiting the current from the system line in a state where the power supply of the system is unstable, and when switching to the second mode, the system Operating the inverter as a master mode that determines the frequency and voltage of the power output to the line.

It is explanatory drawing which shows the functional structural example of the power conditioner 100 with a storage battery which concerns on embodiment of this indication. FIG. 3 is an explanatory diagram showing a functional configuration example of an inverter control circuit 110 according to an embodiment of the present disclosure. It is an explanatory view showing an example of functional composition of voltage detection outlet 230 concerning an embodiment of this indication. It is explanatory drawing which shows the example in which the power conditioner with a storage battery is connected in multiple steps. It is explanatory drawing which shows the structural example of the electric power supply system which concerns on embodiment of this indication. It is explanatory drawing which shows the operation mode and transition conditions of the power conditioner 100 with a storage battery. 6 is a flowchart showing an operation example of the controller 300 according to the embodiment of the present disclosure. It is explanatory drawing which shows the example of a change of the current and voltage at the time of mode switching of the power conditioner 100 with a storage battery. It is explanatory drawing which shows the example of a change of the current and voltage at the time of mode switching of the power conditioner 100 with a storage battery. It is explanatory drawing which shows the structural example of the electric power supply system between vehicles.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In this specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals, and a duplicate description will be omitted.

The description will be given in the following order.
1. Embodiment of the present disclosure 1.1. Background 1.2. System configuration example 1.3. Operation example 1.4. Application example 2. Summary

<1. Embodiment of the present disclosure>
[1.1. Background]
Before describing the embodiments of the present disclosure in detail, first, the background of the embodiments of the present disclosure will be described.

The power conditioner that does not have a storage battery has a structure that constantly monitors the voltage of the grid (commercial power grid) and disconnects it from the grid via a relay when the voltage of the grid goes out of a certain range. Such a power conditioner is not directly connected to an electric device that is a load, but measures the amount of power sold through a power meter for selling power. Further, such a power conditioner has a structure that is connected from the grid side through a power meter for power purchase. In such a case, if the system fails, the electrical equipment will also stop.

　The power conditioner with storage battery does not need to be disconnected from the grid even when the grid is in an abnormal condition because the power flow is set so as not to reverse flow. However, such a power conditioner stops the output when the power of the system becomes abnormal, so that it cannot supply power to the connected electrical equipment and has a structure that supplies a limited small amount of power from another output. There is. Therefore, an electric device that is normally connected to a power conditioner having a storage battery cannot receive electric power when the system is abnormal and stops.

　The power conditioner with a storage battery can be provided with a reverse power flow limiting function. However, such a power conditioner cannot mix the purchased power and the sold power with the power of the storage battery. Therefore, reverse power flow may occur 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 where the amount of power flow cannot be limited, resulting in a significant change in power generation. The system to which the conditioner is connected may become unstable.

　If there is a problem with the backbone system and some system lines are disconnected from the backbone system line, the power conditioner connected to the disconnected system line does not have a voltage source. For this reason, if the power conditioner has a storage battery, the power conditioner operates independently using the power of the storage battery. Therefore, when the electric power stored in the storage battery is consumed, not only the electric equipment connected to the power conditioner but also the power conditioner itself is stopped.

Therefore, in view of the above-mentioned points, the present discloser is keen on a technology that can directly supply the power of the storage battery as AC power to the grid by the power conditioner when the power is not supplied or becomes unstable due to the grid failure. Study was carried out. As a result, the present disclosure discloses a power conditioner that can supply the power of the storage battery as AC power to the grid as it is when the power supply is stopped or becomes unstable due to the grid failure, as described below. I came up with the idea.

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

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

The inverter control circuit 110 is a device that converts the battery stored in the storage battery 140 into DC power from AC power for use by the

loads

210 and 220 connected to the power conditioner 100 with storage battery. In this embodiment, the inverter control circuit 110 has a plurality of operation modes. In this embodiment, the inverter control circuit 110 has a current control mode and a voltage control mode. In addition, in the present embodiment, the inverter control circuit 110 has a frequency heterogeneous mode and a frequency autonomous mode. The inverter control circuit 110 has a function of switching between a current control mode and a voltage control mode, and a function of switching between a frequency heterogeneous mode and a frequency autonomous mode. The inverter control circuit 110 receives an instruction from the power control circuit 120 via the input terminal io1 and switches between these modes. The inverter control circuit 110 has a function of monitoring the voltage vg and the frequency fg of the AC system via the si2 terminal and notifying the power control circuit 120 of the states of the voltage vg and the frequency fg of the AC system via the terminal io1. To have.

The power control circuit 120 obtains the state of charge of the storage battery 140, notifies the other system via the communication line COM, and operates the inverter control circuit 110 according to an instruction from the other system. Performs actions such as switching modes. Further, the power control circuit 120 drives the system cooperation relay 130 to execute an operation of causing the power conditioner 100 with a storage battery to cooperate with the system line G1.

The power conditioner 100 with a storage battery has three operation modes as a whole. The three operation modes are a grid-coupling frequency heterogeneous current control mode, a grid-uncoupling frequency autonomous voltage control mode, and a grid-coupling frequency autonomous voltage control mode. The power control circuit 120 operates based on the state of charge of the storage battery 140, the voltage and frequency states of the AC system sent from the inverter control circuit 110, and the instruction from the communication line, and the operation mode of the power conditioner 100 with storage battery. Is changed, the voltage/current control amount is changed, and the system cooperation relay 130 is switched.

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

In the grid non-coordinated frequency autonomous voltage control mode, when the SOC of the storage battery 140 decreases, the power control circuit 120 decreases the control voltage by a predetermined amount and gradually reduces the power consumption of the

loads

210 and 220.

The

loads

210 and 220 are supplied with power from the power conditioner 100 with a storage battery. The load 220 is connected via the voltage detection 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 the voltage drop of the inverter control circuit 110.

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

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

As illustrated 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 unit 113, and a mode switching current instruction unit. 114 and an operational amplifier 115 are included.

The bidirectional AC/DC inverter 111 is an inverter capable of converting AC to DC and converting DC to AC. The voltage/frequency monitor 112 monitors the voltage and frequency of the AC system when the switch sw1 is tilted to the terminal si2 side. The voltage/frequency monitor 112 notifies the mode switching current instructing unit 114 if an abnormality occurs in the voltage and frequency of the AC system.

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

In the island mode and the master mode, which will be described later, the mode switching current instruction unit 114 tilts the switch sw1 to the reference signal output unit 113 side. The reference signal Vac serves as 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, not current control. In the slave mode, which will be described later, the mode switching current instruction unit 114 tilts the switch sw1 to the terminal si3 side, and the voltage/frequency monitor 112 monitors the voltage and frequency states of the AC system. Then, the operational amplifier 115 compares the current instruction value via the terminal io1 with the current signal from the terminal si3, and outputs the comparison result to the bidirectional AC/DC inverter 111, whereby the bidirectional AC/DC inverter 111 outputs. Performs current control.

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

FIG. 3 is an explanatory diagram illustrating a functional configuration example of the voltage detection outlet 230 according to the embodiment of the present disclosure. Hereinafter, a functional configuration example 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, the voltage detection outlet 230 according to the embodiment of the present disclosure is configured to include a voltage detector 231 and a relay 232.

The voltage detector 231 detects the input voltage of the 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 becomes lower than the 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 having such a configuration allows the load (load 220) connected to the end of the voltage detection outlet 230 when the output voltage of the inverter control circuit 110 is reduced due to the decrease in the amount of power of the storage battery 140. It is possible to cut off the power supply to. On the other hand, an important load that can operate even at a low voltage (for example, the load 210) can continue to operate even when the output voltage of the inverter control circuit 110 has decreased due to the decrease in the amount of power of the storage battery 140.

The system cooperation relay 130 and the relay 232 may be electromagnetic relays, and may be semiconductor relays (SSR) or thyristors.

The example of the functional configuration of the voltage detection outlet 230 according to the embodiment of the present disclosure has been described above with reference to FIG. Note that FIG. 1 illustrates a configuration example in which only one power conditioner 100 with a storage battery is provided, but the present disclosure is not limited to this example. For example, as shown in FIG. 4, the load 210 and the power conditioner 100b with a storage battery are connected to the end of the power conditioner 100a with a storage battery, and the load 220 is connected to the end of the power conditioner with a storage battery 100b. Is also possible.

For example, by coping with the load 220 having a large fluctuation in power consumption by the power conditioner 100b with a storage battery in the lower layer, the peak of the layer and the peak of the upper layer do not overlap and the supply capacity of the power conditioner is not exceeded. You can

When the load 210 and the load 220 operate at the same time, when the power conditioner with a storage battery exceeds the supply capacity, 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 electric power demand by the power conditioner 100b with a storage battery is supplied by the power conditioner 100a with a storage battery. With the hierarchical structure as shown in FIG. 4, it is possible to avoid the peak power consumption.

By connecting a plurality of power conditioners 100 with storage batteries shown in FIG. 1 in parallel, it is possible to exchange power between the power conditioners 100 with storage batteries.

FIG. 5 is an explanatory diagram showing a configuration example of the power supply system according to the 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 system line G2.

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

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

When there is an abnormality in the voltage or frequency of the system line G1, the power conditioners 100a to 100d with storage batteries are disconnected from the branch system line G2 and switched to island mode (IM). When the voltage or frequency abnormality of the system line G1 is prolonged, the switch GSW1 is turned off, and the branch system line G2 is disconnected from the system line G1. The switch GSW1 can be turned on and off by, for example, an operator who supplies electric power through the system line G1. When the controller 300 confirms that the switch GSW1 is turned off and the branch system 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 selects the selected power with storage battery. Instruct the conditioner to enter master mode (MM). Here, it is assumed that the power conditioner 100c with a storage battery is selected in the master mode. Although which power conditioner with a storage battery is selected for the master mode is not limited to a specific example, for example, the one with the largest remaining amount of the storage battery may be selected for the master mode.

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

The controller 300 communicates with each of the power conditioners 100a to 100d with a storage battery, switches the power conditioner with a storage battery capable of power exchange to the slave mode (SM), and sets the current control value respectively. The power conditioner with a storage battery switched to the slave mode exchanges electric power with another power conditioner with a storage battery.

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

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

(Transition from stop mode)
The power conditioner 100 with a storage battery in the stop mode is activated when receiving power from the grid or power from the storage battery, and operates in the island mode.

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

(Transition from island mode)
The power conditioner 100 with a storage battery monitors the voltage vg and the frequency fg of the system line G1 in the island mode state, and is within a predetermined appropriate range, and the power control circuit 120 is in the slave mode transition permission state. For example, transition to slave mode. In the island mode, the power conditioner 100 with a storage battery transitions to the master mode when the SOC value of the storage battery 140 is equal to or higher than a predetermined value and the power control circuit 120 is in the master mode transition permission state.

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

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

(Master mode)
In the power conditioner 100 with a storage battery, in the master mode, the system cooperation relay 130 that connects the system line and the inverter control circuit 110 is ON, the frequency of AC power is internally generated, and the output of the terminal pio1 is power. The voltage control mode is set according to 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 showing an operation example 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. Hereinafter, an operation example of the controller according to the embodiment of the present disclosure will be described using FIG. 7.

When the controller 300 starts operation, the controller 300 obtains information (BSPC information) on the power conditioner 100 with storage battery connected to the communication line (step S101). Subsequently, the controller 300 determines whether or not the switch GSW1 is off (step S102).

If the result of determination in step S102 is that the switch GSW1 is off (step S102, Yes), the controller 300 selects one of the power conditioners with storage batteries 100a to 100d, and selects the selected storage battery with power conditioner. The master mode is set for the power conditioner (step S103). Here, the power conditioner with storage battery (BSPC) having 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.

Subsequently, the controller 300 determines whether or not there is a power request from at least one of the power conditioners 100a to 100d with a storage battery (step S104).

As a result of the determination in step S104, when there is a power request from at least one of the power conditioners with storage batteries 100a to 100d (Yes in step S104), the controller 300 sets the requested power conditioner with storage battery in the slave mode. Further, the power conditioner with a storage battery, which has a large remaining amount of storage battery and can be supplied with power, is set to the slave mode, and the mutual current amounts are set to the same positive and negative amounts to accommodate the specified power amount (step S105). Then, the controller 300 returns to the process of step S101.

On the other hand, as a result of the determination in step S104, the controller 300 returns to the process of step S101 when there is no power request from any of the power conditioners 100a to 100d with a storage battery (step S104, No).

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

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

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

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

After that, at time t5, the power conditioner 100 with a storage battery is set to the master mode by the controller 300. The power conditioner 100 with a storage battery set to the master mode executes power exchange with another power conditioner 100 with a storage battery connected to the branch system line G2.

[1.4. Application example]
The inverter control circuit 110 according to the embodiment of the present disclosure can be mounted on a moving body such as an automobile. FIG. 9 is an explanatory diagram illustrating a modified example of the embodiment of the present disclosure. FIG. 9 shows an example in which the inverter control circuit 110 is mounted on the automobile 10. The inverter control circuit 110 can receive power from the system line G1 or supply power to the system line G1 via the interface 20 that connects the automobile 10 and the system line G1. Further, the inverter control circuit 110 is connected to a communication unit 150 that executes communication with the outside, and information can be exchanged with another inverter control circuit 110 via the communication unit 150.

FIG. 10 is an explanatory diagram showing a configuration example of a power supply system between vehicles. FIG. 10 shows two

automobiles

10a and 10b equipped with the inverter control circuit 110. The

automobiles

10a and 10b are connected to the controller 300, respectively, so that electric power can be exchanged between the

automobiles

10a and 10b, similarly to the power supply system shown in FIG. In the application examples shown in FIG. 9 and FIG. 10 as well, as shown in FIG. 5, power is received from the branch system line G2 by connecting to the branch system line G2 instead of the system line G1. Alternatively, power may be supplied to the branch system line G2.

<2. Summary>
As described above, according to the embodiment of the present disclosure, a storage battery having a configuration that disconnects the power of the storage battery from the system line so that the power of the storage battery can be supplied as AC power when power is not supplied or becomes unstable due to a failure in the power system. Provided is a power conditioner 100. The power conditioner 100 with a storage battery according to the embodiment of the present disclosure has a structure that can directly supply power to an electric device that is a load from the storage battery.

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 system line is disconnected and only the storage battery is supplied and the capacity of the storage battery is below a certain level. The voltage detection outlet 230 that detects the voltage drop can cut off the power supply to the electric device connected to the destination, so that the electric device that consumes a large amount of power is automatically cut off and the power consumption is low. Since only the lighting device and the electronic device that can be consumed can be selectively operated, the power conditioner 100 with a storage battery according to the embodiment of the present disclosure can maintain an environment necessary for living with a small amount of power.

The power conditioner 100 with a storage battery according to the embodiment of the present disclosure can be linked to or disconnected from the system depending on the amount of electricity stored in the storage battery. Further, since 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 system when linked to the system, another power conditioner 100 with a storage battery connected to the system. 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, that is, an island mode, a slave mode, and a master mode. When the power conditioner 100 with a storage battery according to the embodiment of the present disclosure is connected to a backbone system, a generator of a power company is used as a master power source, and this device exchanges power in a slave mode to transfer power from the backbone system. In the case of disconnection, one of the separated branch systems serves as the master power source, and the other mode can be set in the master mode so that the power can be exchanged in the slave mode, so that power failure can be minimized.

Each step in the processing executed by each device in this specification does not necessarily have to be processed in time series 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 an order different from the order described as the flowchart, or may be processed in parallel.

Also, it is possible to create a computer program for causing the hardware such as the CPU, ROM, and RAM built in each device to exhibit the same function as the configuration of each device described above. A storage medium storing the computer program can also be provided. Further, a series of processes can be realized by hardware by configuring each function block shown in the functional block diagram by hardware.

The preferred embodiments of the present disclosure have been described above in detail with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having 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. Of course, it is understood that the invention also belongs to the technical scope of the present disclosure.

Also, the effects described in the present specification are merely explanatory or exemplifying ones, and are not limiting. That is, the technique according to the present disclosure may have other effects that are apparent to those skilled in the art from the description of the present specification, in addition to or instead of the above effects.

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 system line that supplies AC power, or a second mode that limits the current from the system line and operates autonomously in frequency. Switching part,
An inverter that operates as a master mode that determines the frequency and voltage of the AC power output to the system 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 instruction from the outside.
(3)
The power control device according to (2), further including a control unit that performs control for switching a connection between the system line and the inverter.
(4)
The power control device according to (3), wherein the control unit controls to connect the system line and the inverter when the inverter operates in the master mode.
(5)
In the state of either the first mode or the second mode, the inverter also operates as a slave mode in which electric power is exchanged with the system line according to a set frequency and voltage. The power control device according to any one of (1) to (4).
(6)
In any one of the first mode and the second mode, the inverter also operates as an island mode in which the frequency of AC power is autonomous without being supplied with AC power from the grid. 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 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 in a state where power supply from the grid is unstable.
(9)
A mobile body comprising the power control device according to any one of (1) to (8).
(10)
In the state where the power supply from the system line that supplies the AC power is stable, in the first mode that operates based on the frequency of the AC power from the system line, or in the state where the power supply from the system line is not stable. Switching between any of the second modes in which the current from the grid is limited and the frequency operates autonomously;
Operating the inverter as a master mode that determines the frequency and voltage of the power output to the grid when switching to the second mode;
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 unit 114: Mode switching current instruction unit 115: Operational amplifier 120: Power control circuit 130: System cooperation relay 140: Storage battery 150: Communication part 210: Load 220: Load 230: Voltage detection outlet 231, Voltage detector 232: Relay 300: Controller

Claims

A mode for switching between a first mode that operates based on the frequency of AC power from a system line that supplies AC power, or a second mode that limits the current from the system line and operates autonomously in frequency. Switching part,
An inverter that operates as a master mode that determines the frequency and voltage of the AC power output to the system line when the mode switching unit switches to the second mode;
A power control device comprising:
The power control device according to claim 1, wherein the inverter operates in the master mode based on an instruction from the outside.
The power control device according to claim 2, further comprising a control unit that performs control for switching a connection between the system line and the inverter.
The power control device according to claim 3, wherein the control unit controls to connect the system line and the inverter when the inverter operates in the master mode.
The inverter also operates as a slave mode in which, in either the first mode or the second mode, power is exchanged with the system line according to a set frequency and voltage. Item 2. The power control device according to item 1.
The inverter also operates as an island mode in which the frequency of the AC power is autonomous without being supplied with the AC power from the grid in any one of the first mode and the second mode. 1. The power control device according to 1.
The power control device according to claim 1, wherein the mode switching unit switches to the first mode in a state where power supply from the grid is stable.
The power control device according to claim 1, wherein the mode switching unit switches to the second mode in a state where power supply from the grid is unstable.
A mobile body provided with the power control device according to claim 1.
In the state where the power supply from the system line that supplies the AC power is stable, in the first mode that operates based on the frequency of the AC power from the system line, or in the state where the power supply from the system line is not stable. Switching between any of the second modes in which the current from the grid is limited and the frequency operates autonomously;
Operating the inverter as a master mode for determining the frequency and voltage of the power output to the grid when switching to the second mode;
A power control method comprising: