JP7380563B2 - Power control device and power control method - Google Patents

Description

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

From the perspective of resource conservation, there is a system in which storage batteries are installed in homes, etc., and the electricity generated by solar panels is stored in the batteries, and the surplus electricity is sold through the existing AC power system. For example, Patent Document 1 discloses a technology for a power supply system that aims to appropriately store electricity in a storage battery and sell electricity from the storage battery through an AC power system.

Japanese Patent Application Publication No. 2011-097795

In power control that sends power stored in a storage battery to another storage battery via an AC power grid, if the requested power is to be accurately output to the grid, the voltage of the grid is not constant, so It is necessary to change the current according to fluctuations. However, changes in the input/output current to the grid may cause unstable conditions such as oscillation.

Therefore, the present disclosure proposes a new and improved power control device and power control method that can appropriately accommodate power through the AC power system while keeping the AC power system in a stable state.

According to the present disclosure, there is provided a current control unit that controls an input/output current between a bidirectional AC/DC converter and an AC power transmission line in accordance with a power control instruction from an external power management device; a power amount acquisition section that acquires the actual interchangeable power amount input and outputted by the bidirectional AC/DC converter during the power interchange period, and the actual interchangeable power amount calculated by the power amount acquisition section during the power interchange period. A power control device is provided, comprising: a notification unit that notifies the power management device of information of the power management device.

Further, according to the present disclosure, there is provided a current control unit that controls an input/output current between the bidirectional AC/DC converter and an AC power transmission line according to a power control instruction from an external power management device; a power amount acquisition section that acquires the target power amount specified by the power amount and the actual interchanged power amount input and outputted by the bidirectional AC/DC converter and calculates the difference; A power control device is provided that controls input/output current to the bidirectional AC/DC converter based on the difference calculated by the acquisition unit.

Further, according to the present disclosure, according to a power control instruction from an external power management device, input/output current between the bidirectional AC/DC converter and an AC power transmission line is controlled, and based on the power control instruction, , acquiring the actual amount of interchanged power input and outputted by the bidirectional AC/DC converter during the power interchange period; and notifying the power management device of information on the actual amount of interchanged power during the power interchange period; A power control method is provided, including:

Further, according to the present disclosure, the input/output current between the bidirectional AC/DC converter and the AC power transmission line is controlled in accordance with a power control instruction from an external power management device, and the input/output current is specified by the power control instruction. periodically acquiring the target power amount and the actual interchange power amount input/output by the bidirectional AC/DC converter, calculating the difference, and controlling the bidirectional AC/DC converter based on the difference. A power control method is provided, comprising: controlling an input/output current to a power source.

As explained above, according to the present disclosure, a new and improved power control device and power control method are provided that are capable of appropriately performing power interchange through an AC power system while keeping the AC power system in a stable state. can be provided.

Note that the above effects are not necessarily limited, and in addition to or in place of the above effects, any of the effects shown in this specification or other effects that can be understood from this specification may be used. may be played.

FIG. 1 is an explanatory diagram showing an example of the overall configuration of a power supply system according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram showing a configuration example of a power supply system with two bases extracted. It is an explanatory diagram showing an example of a scenario. FIG. 2 is an explanatory diagram showing an example of the functional configuration of the power control device according to the embodiment. 3 is a flowchart showing an example of the operation of the power management device according to the embodiment. 3 is a flowchart showing an example of the operation of the power control device according to the embodiment. It is a flowchart which shows the example of operation of the bidirectional DC-AC converter based on the same embodiment. It is an explanatory diagram showing an example of the operation sequence by the operation of the power supply system concerning the same embodiment. It is an explanatory diagram showing an example of the operation sequence by the operation of the power supply system concerning the same embodiment. It is an explanatory diagram showing an example of the operation sequence by the operation of the power supply system concerning the same embodiment. It is an explanatory view showing an example of change of target electric energy and accumulated electric energy. It is an explanatory view for explaining the effect of the embodiment.

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. Configuration example 1.2. Operation example 2. summary

<1. Embodiments of the present disclosure>
[1.1. Configuration example]
First, an example of the overall configuration of a power supply system according to an embodiment of the present disclosure will be described. FIG. 1 is an explanatory diagram showing an example of the overall configuration of a power supply system according to an embodiment of the present disclosure. Hereinafter, an example of the overall configuration of a power supply system according to an embodiment of the present disclosure will be described using FIG. 1.

The power supply system according to the embodiment of the present disclosure is a system that enables power interchange between bases such as homes through the AC power system 1. Power interchange between bases is controlled by a power management center (also referred to as PMC) 10. FIG. 1 shows three pillar transformers 20a, 20b, and 20c. In this embodiment, power interchange between bases under the same pole transformer is most effective, but power interchange beyond the pole transformer is of course possible. The power management device 10 acquires the current value of the AC power system 1 measured by the AC power meter (AMR) 30 via the communication line COM.

In the configuration shown in FIG. 1, the bases where power can be exchanged through the AC power system 1 are bases A-1, A-3, B-1, and C-2. To explain base A-1 as an example, base A-1 includes a power control device (also referred to as PCD) 100a, a bidirectional DC/AC converter (Power Conditioning System; PCS) 200a, and an AC wattmeter. 300a, a power storage device 400a, and a solar power generation device 500a (in the following description, the power control device 100, bidirectional DC/AC converter 200, AC wattmeter 300, power storage device 400, and (Sometimes referred to as a solar power generation device 500).

The power control device 100a is a device that controls power exchange between base A-1 and other bases (for example, base A-3). For example, if the power stored in the power storage device 400a is running low and you want to request power to be shared with another base, the power control device 100a sends the power to the power management device 10 via the communication line COM. request for flexibility. When the power control device 100a receives the accommodation instruction from the power management device 10, it controls the bidirectional DC/AC converter 200a to receive power accommodation through the AC power system 1.

The same applies when the power stored in the power storage device 400a is increasing and the power can be exchanged with other bases. In this case, the power control device 100a notifies the power management device 10 through the communication line COM that power is flexible. Upon receiving the accommodation instruction from the power management device 10, the power control device 100a controls the bidirectional DC/AC converter 200a to supply power to the AC power system 1.

The power control device 100a acquires information on the amount of power actually exchanged when power is exchanged with another base. The voltage of the power supplied by the AC power system 1 is not necessarily constant, and as a result of voltage fluctuations, the planned amount of power (scheduled amount of power) may not be flexible. Therefore, the power control device 100a acquires information on the amount of power that has actually been accommodated (actual amount of interchanged power), and transmits the information on the actual amount of interchanged power to the power management device 10. Here, if the difference between the planned power amount and the actual interchanged power amount is equal to or greater than a predetermined threshold value, the power management device 10 instructs that power interchange to correct the difference be performed again between the bases.

The voltage of the AC power system 1 changes depending on changes in the load connected from the AC wattmeter and the amount of power generated by the solar power generation device. However, the power control device 100a does not use this voltage to calculate the control current of the bidirectional DC/AC converter 200a, but uses only the assumed reference voltage to calculate the control current. Since the AC wattmeter outputs the cumulative power value calculated by multiplying the actual voltage, the actual current, and the power factor, the power control device 100a retains the cumulative power at the start of the interchange, and , the cumulative value from the AC wattmeter at the end of the interchange is read out, and the amount of power actually interchanged is calculated.

The bidirectional DC/AC converter 200a is a converter that has the function of converting AC power to DC power and converting DC power to AC power. The bidirectional DC/AC converter 200a operates under the control of the power control device 100a when power is exchanged with other locations. The bidirectional DC/AC converter 200a monitors the current value of AC power when power is exchanged with another base, and controls input/output current using the monitored current value.

The AC power meter 300a is a measuring device that measures the power supplied from the AC power system 1 to the base, and conversely the power output from the base to the AC power system 1. The power control device 100a can obtain information on the actual interchangeable power amount by obtaining information from the AC wattmeter 300a.

In this embodiment, the power company's 1kWH power price unit is Cp, the price unit agreed between the power transmission side and the power reception side is Ca, and in a situation where Cp>Ca, the reverse power flow on the power transmission side is When the power Ps and the power Pr on the power receiving side are Ps<Pr, it is assumed that the power receiving side has purchased the difference from the electric power company in the power price unit Cp. On the other hand, when Ps>Pr, a settlement method is used in which the difference is assumed to be that the power company purchased power in the power price unit Ca.

FIG. 2 is an explanatory diagram showing an example of the configuration of the power supply system by extracting two bases. FIG. 2 shows two bases, base A-1 and base B-1. Note that in FIG. 2, there are two loads 50a and 50c at the base A-1, and the load 50a uses AC power, and the load 50c uses DC power. Further, in FIG. 2, a load 50b and an alternator 600 are shown at base B-2. The load 50b uses AC power.

The power control devices 100a and 100f each read a scenario that defines a power generation schedule for a power generation device (for example, a power generation schedule for the solar power generation device 500a), a power consumption schedule, a power sales price, a power purchase price, and the like. Based on the scenario and the amount of power stored in power storage devices 400a and 400f, an application is made to power management device 10 for power interchange.

FIG. 3 is an explanatory diagram showing an example of a scenario. FIG. 3 shows, as a scenario, the power consumption in time series at the base, the maximum amount of power storage (Max SOC) and the minimum amount of power storage (Min SOC) in time series of the power storage device. Referring to this scenario, the power control device 100a applies for power sale if the amount of power in the power storage device 400a is considered to be surplus, and requests power purchase if the amount of power in the power storage device 400a is considered to be insufficient. apply. In addition, in the scenario shown in Figure 3, during times when the price (Grid price) when purchasing electricity from a power company through AC power system 1 is high, purchases from the power company are suppressed, and during times when the Grid price is low. is set up to be purchased from the electric power company.

The power management device 10 calculates the amount of power accommodating between the power control devices in response to a request from each power control device connected by the communication line COM, and creates a power accommodating schedule synchronized with the power pattern to be accommodated. power control device. The flexible power pattern is, for example, one in which 1.0 kWh of power is flexible for 30 minutes.

The power control device 100a calculates a current control pattern for the bidirectional DC/AC converter 200a according to the power pattern and accommodation schedule received from the power management device 10. From the given power pattern, the amount of current is calculated based on the reference voltage and reference power factor of the AC power system 1 to which the bidirectional DC/AC converter 200a is connected. Therefore, when the reference voltage of the AC power system 1 is 200V and when it is 100V, the amount of current flowing through the bidirectional DC/AC converter 200a is twice as different.

The power control device 100a performs current control of the bidirectional DC/AC converter 200a according to the power pattern calculated by the power management device 10. Here, the power interchange is controlled so that the consumption of the load connected inside the ammeter ir1 is not included in the interchangeable power. Therefore, when there is no power interchange and the load is consuming power, the power control device 100a controls the bidirectional DC/AC converter 200a so that the ammeter ir1 is always 0A.

One of the characteristics of the power supply system according to the embodiment of the present disclosure is that, as shown in FIG. 1, bases where a power control device is installed and bases where a power control device is not installed can coexist. It is. In other words, a base where a power control device is installed can not only receive power supply from the AC power system 1, but also be able to exchange power with other bases where a power control device is installed. be. On the other hand, bases that are not equipped with a power control device only receive power from the AC power system 1, but do not receive power from bases that are equipped with a power control device, and It also does not affect the power supply from the base where the device is installed.

The overall configuration example of the power supply system according to the embodiment of the present disclosure has been described above. Next, an example of the functional configuration of the power control device according to the embodiment of the present disclosure will be described.

FIG. 4 is an explanatory diagram showing an example of a functional configuration of power control device 100 according to an embodiment of the present disclosure. Hereinafter, a functional configuration example of the power control device 100 according to the embodiment of the present disclosure will be described using FIG. 4.

As shown in FIG. 4, the power control device 100 according to the embodiment of the present disclosure includes an accommodation pattern generation section 110, a current control section 120, a power amount acquisition section 130, and a notification section 140. configured.

The accommodation pattern generation unit 110 reads the scenario, obtains the amount of stored electricity (State of Charge; SOC) of the power storage device 400, and generates an electricity accommodation pattern. The generated accommodation pattern is sent to the power management device 10 by the notification unit 140, for example.

The current control unit 120 controls the input/output current between the bidirectional DC/AC converter 200 and the AC power system 1 according to a power control instruction from the power management device 10 .

Based on the power control instruction from the power management device 10, the power amount acquisition unit 130 calculates the actual power interchange period input/output by the bidirectional DC/AC converter 200 and indicated in the power control instruction from the power management device 10. Get power amount information. Specifically, the power amount acquisition unit 130 obtains the amount of power measured by the AC wattmeter 300a at the start time of the power interchange period, the amount of power measured by the AC wattmeter 300a at the end time of the power interchange period, get.

The notification unit 140 performs notification to the power management device 10. For example, the notification unit 140 performs a process of notifying the power management device 10 of the accommodation pattern generated by the accommodation pattern generation unit 110. For example, the notification unit 140 performs a process of notifying the power management device 10 of information on the actual interchangeable power amount acquired by the power amount acquisition unit 130 during the power interchange period. The notification unit 140 notifies the power management device 10 of the information on the actual power interchange amount during the power interchange period, so that the power management device 10 calculates the difference between the planned interchange power amount and the actual interchange power amount during the power interchange period. Power accommodation for correction can be instructed to the power control device 100 of the base that performed the power accommodation.

By having such a configuration, the power control device 100 according to the embodiment of the present disclosure generates a power interchange pattern and notifies the power management device 10, and also manages the information on the actual interchanged power amount during the power interchange period. Device 10 may be notified. By operating in this manner, the power control device 100 according to the embodiment of the present disclosure causes a change in the voltage of the AC power system 1 and a difference between the planned interchangeable power amount and the actual interchangeable power amount at the time of power interchange. Even if this occurs, it becomes easy to correct the difference in the power fee based on the difference in the amount of power when paying the power fee in the power management device 10.

For example, suppose that the planned interchangeable power amount when the base A-1 receives power is 1.0 kWh, but the voltage of the AC power system 1 fluctuates, and the actual interchangeable power amount at the time of power interchange is 0.9 kWh. Although a difference of 0.1 kWh occurs, the information on the difference can be grasped by the power management device 10. The power management device 10 may reduce the price for the difference, and may later instruct the power control device 100 of the target base to re-accommodate power for the difference.

The functional configuration example of the power control device 100 according to the embodiment of the present disclosure has been described above using FIG. 4. Next, an example of the operation of the power supply system according to the embodiment of the present disclosure will be described.

[1.2. Operation example]
FIG. 5 is a flowchart illustrating an example of the operation of the power management device 10 according to the embodiment of the present disclosure. Hereinafter, an example of the operation of the power management device 10 according to the embodiment of the present disclosure will be described using FIG. 5.

When the power management device 10 starts operating, it first determines whether there is a request for power interchange from the power control device 100 (step S101). The power management device 10 waits until there is a request for power interchange from the power control device 100 (step S101, No).

When there is a request for power accommodation from the power control device 100 (Step S101, Yes), it is determined whether it matches a request for power accommodation from another power control device 100 (Step S102). The request for power accommodation from the power control device 100 includes information on available power supply time, minimum power, maximum power, amount of power, and price range.

Note that in FIG. 5, the power management device 10 determines whether the request for power interchange from another power control device 100 is met, but the power company that supplies power to the AC power system 1 also You can be chosen as a flexible partner.

If it does not match the request for power accommodation from another power control device 100 (Step S102, No), the power management device 10 adds the obtained request for power interchange to the accommodation reservation list (Step S103), and in Step S101 The process returns to the process of waiting for an accommodation request.

On the other hand, if it matches the power accommodation request from the power control device 100 (step S102, Yes), the power management device 10 sets the accommodation pattern and start time between the accommodation pairs, and provides data to the matching accommodation pair. (Step S104).

For example, when the power management device 10 determines the power control device 100a of base A-1 and the power control device 100e of base B-1 as an accommodation pair, the power management device 10 sends the power interchange pattern and start time to the power control devices 100a and 100e. Send information.

Thereafter, when the start time arrives, power accommodation begins between the accommodation pairs determined by the power management device 10. Then, the power management device 10 waits until it receives a notification of completion of power interchange from the power control device 100 of the base performing power interchange (step S105). Upon receiving the accommodation end notification (step S105, Yes), the power management device 10 receives the end information from the two accommodating power control devices 100, and obtains the difference between the planned interchange power amount and the actual interchange power amount. (Step S106).

The power management device 10 determines whether or not the difference between the planned interchange power amount and the actual interchange power amount is within the specified range (step S107), and if it is within the specified range (step S107, Yes), it waits for an accommodation request in step S101. Return to processing. On the other hand, if it is not within the specified range (step S107, No), then the power management device 10 determines whether or not it is set to perform accommodation correction at the time of difference (step S108).

If the setting is not to perform accommodation correction (step S108, No), the power management device 10 returns to the process of waiting for an accommodation request in step S101. On the other hand, if the setting is to perform the accommodation correction (step S108, Yes), the power management device 10 calculates the accommodation correction value (step S109), and transmits the data of the accommodation correction value to the accommodation pair (step S104). ).

The operation example of the power management device 10 according to the embodiment of the present disclosure has been described above using FIG. 5. Next, an example of the operation of the power control device 100 according to the embodiment of the present disclosure will be described.

FIG. 6 is a flowchart illustrating an example of the operation of the power control device 100 according to the embodiment of the present disclosure. Hereinafter, an example of the operation of the power control device 100 according to the embodiment of the present disclosure will be described using FIG. 6.

When the power control device 100 starts operating, it first reads the scenario and the SOC of the power storage device 400, and calculates the amount of power that will be required in the future (step S111). Then, as a result of the power amount calculation, power control device 100 determines whether the excess or deficiency between the power stored in power storage device 400 and the power consumed by the load or the like is greater than or equal to a specified value (step S112).

If the excess or deficiency is equal to or greater than the specified value (Step S112, Yes), the power control device 100 generates a power accommodation pattern in the accommodation pattern generation unit 110, and transmits it to the power management device 10 (Step S113). At this time, the power control device 100 may notify the power management device 10 of information on the power selling price when accommodating power. On the other hand, if the excess or deficiency is not equal to or greater than the specified value (step S112, No), the power control device 100 skips the process of step S113.

Next, the power control device 100 determines whether there is an accommodation instruction from the power management device 10 (step S114). If there is an accommodation instruction from the power management device 10 (step S114, Yes), the power control device 100 controls the bidirectional DC/AC converter 200 based on the accommodation instruction from the power management device 10. The power control device 100 also records the values of the AC wattmeter 300 at the start and end of power interchange, and notifies the power management device 10 of the difference (step S115). On the other hand, if there is no accommodation instruction from the power management device 10 (step S114, No), the power control device 100 returns to the process of step S111.

When controlling the bidirectional DC/AC converter 200, the power control device 100 notifies the bidirectional DC/AC converter 200a of the control current value ic.

The operation example of the power control device 100 according to the embodiment of the present disclosure has been described above using FIG. 6. Next, an example of the operation of the bidirectional DC/AC converter 200 according to the embodiment of the present disclosure will be described.

FIG. 7 is a flowchart illustrating an example of the operation of the bidirectional DC/AC converter 200 according to the embodiment of the present disclosure. Hereinafter, an example of the operation of the bidirectional DC/AC converter 200 according to the embodiment of the present disclosure will be described using FIG. 7.

When the bidirectional DC/AC converter 200 starts operating, it first obtains the control current value ic from the power control device 100 (step S121). Subsequently, the bidirectional DC/AC converter 200 determines whether the current value ir of the flowing current is within the regulation of the control current value ic while executing power interchange (step S122).

If the current value ir of the flowing current is within the regulation of the control current value ic (step S122, Yes), the bidirectional DC/AC converter 200 returns to the process of step S121. On the other hand, if the current value ir of the flowing current is not within the regulation of the control current value ic (step S122, No), the bidirectional DC/AC converter 200 changes the control target value so that the current value ir becomes the control current value ic. It operates so that the current value ic falls within the specified range (step S123).

Subsequently, the bidirectional DC/AC converter 200 determines whether the current value ir of the flowing current is within the regulation of the control current value ic as a result of changing the control target value (step S124). If the current value ir of the flowing current is within the regulation of the control current value ic (step S124, Yes), the bidirectional DC/AC converter 200 returns to the process of step S121. On the other hand, if the current value ir of the flowing current is not within the regulation of the control current value ic (step S124, No), the bidirectional DC/AC converter 200 converts the current into a generator (for example, an AC generator) if the reverse current is large. (step S125).

The operation example of the bidirectional DC/AC converter 200 according to the embodiment of the present disclosure has been described above using FIG. 7 . Next, an example of an operation sequence of the operation of the power supply system according to the embodiment of the present disclosure will be described.

FIG. 8 is an explanatory diagram showing an example of an operation sequence of the operation of the power supply system according to the embodiment of the present disclosure. FIG. 8 shows an operation sequence when power is exchanged between two bases A-1 and B-1 included in the power supply system according to the embodiment of the present disclosure.

When the power management device 10 determines that a power interchange pattern has been generated in advance between the two bases A-1 and B-1, and that the request for power interchange is matched between the two bases A-1 and B-1. do. From time t1 to time t2, power accommodation is performed based on the power accommodation pattern. Here, it is assumed that base A-1 is supplied with power at 20 amperes for a period of 30 minutes, and base B-1 is supplied with power at 10 amperes for a period of 30 minutes.

However, as shown in FIG. 8, the voltage of the AC power system 1 may not be stable. If the voltage changes when a constant current is being drawn, the amount of power received or supplied will fluctuate. Therefore, even if, for example, 1kWh of power is to be exchanged, base A-1 may be able to supply only 0.9kWh of power, and base B-1 may receive 1.1kWh of power. .

If such an error occurs as a result of the scheduled accommodation, and if the difference is greater than an allowable value, the power management device 10 determines whether the main electric power company connected to the AC power system 1 should make compensation. Assuming that the error has been made, the electricity charges will be calculated for the error. In the example in Figure 8, base A-1 sells 0.9 kWh of electricity to base B-1, and base B-1 purchases 0.9 kWh at the price agreed between bases A-1 and B-1. However, the additional 0.2kWh will be purchased from the power company.

Conversely, if base A-1 transmits more power than planned and base B-1 receives less power than planned, the amount of discharged will be charged at the power company's specified price or between bases A-1 and B-1. The product shall be sold at the lower price agreed between the parties.

In addition, in this embodiment, power interchange to correct this difference is executed again between the bases A-1 and B-1. That is, the power management device 10 instructs base A-1 to supply power of 0.1 kWh, which is insufficient, and base B-1 to transmit power of 0.1 kWh, which it received in large quantities. In the example of FIG. 8, between time t3 and t4, base B-1 returns 0.1 kWh of power to AC power system 1, and between time t5 and t6, base A-1 returns 0.1 kWh of power to AC power system 1. is transmitted to AC power system 1.

Note that the power management device 10 calculates arbitration fees when power is exchanged between bases and compensation electricity charges for power transmission losses due to the length of the route to be accommodated using a prescribed calculation formula and bills each customer. You may.

FIG. 9 is an explanatory diagram showing changes in the currents of the power source, load, and battery in time series. FIG. 9 shows changes in current at bases A-1, B-1, and C-2 in FIG. An example of changes in the currents of power generation device 500, two loads 50, and power storage device 400 is shown.

Before time t1, the power of power storage device 400 is used by the load. After that, between time t1 and time t2, base A-3 buys the electricity sold from base A-1 at 25 yen/kWh. A part of the power supplied through this power purchase is stored in power storage device 400, and the rest is used by the load.

The power purchase from base A-1 ends at time t2, and subsequently, between time t3 and t4, base A-3 buys the electricity sold from base B-1 at 28 yen/kWh. .

At time t4, power purchase from base B-1 ends. Then, at a time before time t4, power generation by the solar power generation device 500 starts, and the power storage device 400 can store the power generated by the solar power generation device 500. Then, since the power storage device 400 has a surplus in the amount of power stored, the base A-3 sells power to the base C-2 at 30 yen/kWh between times t5 and t6.

The power management device 10 manages the start time and end time of the power buying and selling at these bases A-3. As the amount of power at that time, a value calculated by AC wattmeter 300 and notified from power control device 100 is used. Therefore, even if the electricity prices at each location are different, it can be handled appropriately with one electricity meter per location. In the example of FIG. 9, the total amount of product purchased power prices at base A-3 is (Pt2-Pt1) x 25 yen + (Pt4 - Pt3) x 28 yen - (Pt6 - Pt5) x 30 yen. In this equation, Pt1 to Pt6 refer to the values of AC wattmeter 300 at times t1 to t6, respectively.

The power control device 100 periodically calculates the cumulative power amount with respect to the target power amount given from the power management device 10 during the power interchange period specified by the power control instruction from the power management device 10, and calculates the accumulated power amount. The final error between the target power amount and the cumulative power amount may be reduced by correcting the difference as needed.

FIG. 10 is a flowchart illustrating an example of the operation of the power control device 100 according to the embodiment of the present disclosure. Hereinafter, an example of the operation of the power control device 100 according to the embodiment of the present disclosure will be described using FIG. 10.

The power control device 100 waits until an instruction from the power management device 10 is received (Step S131, No), and when the instruction from the power management device 10 arrives (Step S131, Yes), the AC wattmeter 300 and the power management device 10 is acquired, and each acquired information is stored in a variable (step S132). The process of step S132 can be executed by the power amount acquisition unit 130, for example.

Specifically, the power control device 100 obtains the system voltage value from the information of the AC wattmeter 300, calculates the average voltage value from that value, and stores it in the variable V. Further, the power control device 100 holds the commanded power value from the power management device 10 in a variable P. Further, the power control device 100 holds the power flow/reverse power flow time as a variable t.

Subsequently, the power control device 100 determines whether the variable t has become 0 or less (step S133). The process of step S133 can be executed by the power amount acquisition unit 130, for example. If the variable t is less than or equal to 0 (step S133, Yes), the power control device 100 ends the process. On the other hand, if the variable t is not equal to or less than 0 (step S133, No), the power control device 100 uses the variables P and t held in the above step S132 or the variables P and t updated in step S135 described below. , calculates the current value of the bidirectional DC/AC converter 200, instructs the bidirectional DC/AC converter 200, and updates the variable value using the information acquired from the AC wattmeter 300 (step S134). The process of step S134 can be executed by the current control unit 120, for example.

Specifically, the power control device 100 calculates the current value from the value of the variable P and the value of V as i=P/V, sets the value of i to the bidirectional DC/AC converter 200, and performs control. . Furthermore, the power control device 100 obtains the current accumulated power amount from the AC wattmeter 300 and holds it in a variable W.

Subsequently, the power control device 100 updates the variable value using the information from the AC wattmeter 300 after waiting for a certain period of time Δt (step S135). The process of step S135 can be executed by the power amount acquisition unit 130, for example. Specifically, after waiting for a predetermined time Δt in step S135, the power control device 100 obtains the cumulative power amount from the AC wattmeter 300, and calculates the difference ΔWh with the variable W. Furthermore, the power control device 100 updates the variable t as t=t−Δt, and updates the variable P as P=(P×t−ΔWh)/t. After updating the variable value, the power control device 100 returns to the determination process in step S133.

By executing the series of operations shown in FIG. 10, the power control device 100 periodically calculates the accumulated power amount with respect to the target power amount given from the power management device 10, and corrects the difference as needed. can do. By executing the series of operations shown in FIG. 10, the power control device 100 can reduce the final error between the target power amount and the accumulated power amount.

FIG. 11 is an explanatory diagram showing an example of changes in the target power amount and cumulative power amount during the power interchange period specified by the power control instruction from the power management device 10. In the graph shown in FIG. 11, the horizontal axis represents time, and the vertical axis represents the voltage value of the AC power system, the control current value of the bidirectional DC-AC converter 200, and the amount of electric power.

If it is found that a difference has occurred between the target power consumption curve P1 and the cumulative power consumption Psum at time t1, the power control device 100 updates the target power consumption and also sets a new control current value. An attempt is made to reduce the error by applying the following to the bidirectional DC/AC converter 200.

At the subsequent time t2, if it is found that a difference has occurred between the target power amount curve P2 and the cumulative power amount Psum, the power control device 100 updates the target power amount and also sets a new control current. By supplying the value to the bidirectional DC/AC converter 200, an attempt is made to reduce the error.

At the subsequent time t3, if it is found that a difference has occurred between the target power amount curve P3 and the cumulative power amount Psum, the power control device 100 updates the target power amount and also sets a new control current. By supplying the value to the bidirectional DC/AC converter 200, an attempt is made to reduce the error.

By controlling in this way, the power control device 100 can periodically calculate the cumulative power amount with respect to the target power amount given from the power management device 10, and correct the difference as needed. Then, the power control device 100 can reduce the final error between the target power amount and the cumulative power amount.

FIG. 12 is an explanatory diagram showing the effects of the embodiment of the present disclosure. FIG. 12 shows two bases A-1 and X-1, base A-1 has a configuration according to the embodiment of the present disclosure, and base X-1 has separate AC for power transmission and power reception. It is equipped with a power meter.

Because the fee structure for purchasing and selling electricity is different, base X-1 calculates the electricity selling fee by measuring the amount of electricity generated by the solar power generation equipment (PV) with one electricity meter (AMR2). On the other hand, electricity consumption must be measured using a separate electricity meter (AMR1) to calculate electricity purchase charges. In addition, at base X-1, in preparation for a power outage, some of the specific loads are made to be supplied by an inverter (INV), but the system does not allow reverse power flow.

On the other hand, at base A-1, the electricity rate can be clearly determined from the amount of electricity when selling and buying electricity, and the interchange time. Therefore, the advantage is that base A-1 only needs one AC wattmeter.

<2. Summary＞
As described above, according to the embodiments of the present disclosure, there is provided a power control device installed in a power supply system capable of mutually accommodating power via an AC power system, A power control device is provided that controls the current and transmits the amount of power at the start and end of the interchange to a central power management device. The power control device according to the embodiment of the present disclosure provides the power management device with the amount of power at the start and end of the power interchange, thereby determining the amount of power scheduled to be interchanged and the amount of power actually to be interchanged. You can understand the difference between

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 current control unit that controls an input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with a power control instruction from an external power management device;
a power amount acquisition unit that acquires the actual interchanged power amount input and outputted by the bidirectional AC/DC converter during the power interchange period based on the power control instruction;
a notification unit that notifies the power management device of information on the actual interchangeable power amount calculated by the power amount acquisition unit during the power interchange period;
A power control device comprising:
(2)
The power control device according to (1), wherein the notification unit requests the power management device to accommodate power through the AC power transmission line when a need for accommodation of power arises.
(3)
The power control device according to (2), wherein the notification unit requests power accommodation from the power management device based on a predetermined power scenario.
(4)
The power control device according to (3), wherein the predetermined power scenario includes a power consumption schedule by a load that uses power.
(5)
The power control device according to (3), wherein the predetermined power scenario includes a power generation schedule by a power generation device that generates power.
(6)
The power control device according to (5), wherein the power generation device is a solar power generation device.
(7)
The power control device according to any one of (3) to (6), wherein the predetermined power scenario includes an amount of electricity stored in a storage battery.
(8)
The notification unit requests power accommodation from the power management device based on a state of a power storage device connected to the bidirectional AC/DC converter, and the power management device according to any one of (2) to (7) above. Control device.
(9)
The electric power according to any one of (1) to (8), wherein the current control unit controls input/output current based on a reference voltage of the AC power transmission line to which the bidirectional AC/DC converter is connected. Control device.
(10)
When the difference between the planned interchangeable power amount and the actual interchangeable power amount in the power interchange period is equal to or greater than a predetermined threshold, the current control unit bidirectionally performs power interchange corresponding to the difference at a predetermined timing. The power control device according to any one of (1) to (9) above, which instructs a DC converter.
(11)
The power control device according to any one of (1) to (10), wherein the notification unit notifies the power management device of information on a power selling price when providing power.
(12)
a current control unit that controls an input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with a power control instruction from an external power management device;
a power amount acquisition unit that acquires the target power amount specified in the power control instruction and the actual interchange power amount input and output by the bidirectional AC/DC converter, and calculates a difference;
Equipped with
The current control unit is a power control device that controls an input/output current to the bidirectional AC/DC converter based on the difference calculated by the power amount acquisition unit.
(13)
The power control according to (12), wherein the power amount acquisition unit acquires the target power amount and the actual power interchange amount in a power interchange period specified by the power control instruction, and calculates a difference. Device.
(14)
controlling input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with power control instructions from an external power management device;
Obtaining the actual amount of interchanged power input and outputted by the bidirectional AC/DC converter during the power interchange period based on the power control instruction;
Notifying the power management device of information on the actual power interchange amount during the power interchange period;
A power control method, including:
(15)
controlling input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with power control instructions from an external power management device;
Periodically acquiring the target power amount specified by the power control instruction and the actual interchange power amount input and output by the bidirectional AC/DC converter, and calculating the difference;
controlling an input/output current to the bidirectional AC/DC converter based on the difference;
A power control method, including:

1: AC power system 10: Power management device 100: Power control device 200: Bidirectional DC/AC converter 300: AC wattmeter 400: Power storage device 500: Solar power generation device 600: AC generator

Claims (14)

a current control unit that controls an input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with a power control instruction from an external power management device;
a power amount acquisition unit that acquires the actual interchanged power amount input and outputted by the bidirectional AC/DC converter during the power interchange period based on the power control instruction;
a notification unit that notifies the power management device of information on the actual interchangeable power amount calculated by the power amount acquisition unit during the power interchange period ;
When the difference between the planned interchangeable power amount and the actual interchangeable power amount in the power interchange period is equal to or greater than a predetermined threshold, the current control unit bidirectionally performs power interchange corresponding to the difference at a predetermined timing. A power control device that instructs the DC converter . The power control device according to claim 1, wherein the notification unit requests the power management device to accommodate power through the AC power transmission line when a need for power accommodation arises. The power control device according to claim 2, wherein the notification unit requests power accommodation from the power management device based on a predetermined power scenario. The power control device according to claim 3, wherein the predetermined power scenario includes a power consumption schedule by a load using power. The power control device according to claim 3, wherein the predetermined power scenario includes a power generation schedule by a power generation device that generates power. The power control device according to claim 5, wherein the power generation device is a solar power generation device. The power control device according to any one of claims 3 to 6 , wherein the predetermined power scenario includes an amount of electricity stored in a storage battery. The power control unit according to any one of claims 2 to 7 , wherein the notification unit requests power accommodation from the power management device based on a state of a power storage device connected to the bidirectional AC/DC converter. Device. The power control unit according to any one of claims 1 to 8 , wherein the current control unit controls input/output current based on a reference voltage of the AC power transmission line to which the bidirectional AC/DC converter is connected. Device. The power control device according to any one of claims 1 to 9 , wherein the notification unit notifies the power management device of information on a power selling price when providing power. a current control unit that controls an input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with a power control instruction from an external power management device;
a power amount acquisition unit that acquires the target power amount specified in the power control instruction and the actual interchange power amount input and output by the bidirectional AC/DC converter, and calculates a difference;
Equipped with
The current control unit is a power control device that controls an input/output current to the bidirectional AC/DC converter based on the difference calculated by the power amount acquisition unit. The power control device according to claim 11 , wherein the power amount acquisition unit acquires the target power amount and the actual power interchange amount in a power interchange period specified by the power control instruction, and calculates a difference. . a current control step of controlling input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with a power control instruction from an external power management device;
a power amount acquisition step of acquiring the actual power interchange amount input/output by the bidirectional AC/DC converter during the power interchange period based on the power control instruction;
a notification step of notifying the power management device of information on the actual power interchange amount during the power interchange period ;
In the current control step, when the difference between the planned interchangeable power amount and the actual interchangeable power amount in the power interchange period is equal to or greater than a predetermined threshold, the power interchange corresponding to the difference is bidirectionally exchanged at a predetermined timing. A power control method that instructs a DC converter . controlling input/output current between the bidirectional AC/DC converter and the AC power transmission line in accordance with power control instructions from an external power management device;
Periodically acquiring the target power amount specified by the power control instruction and the actual interchange power amount input and output by the bidirectional AC/DC converter, and calculating the difference;
controlling an input/output current to the bidirectional AC/DC converter based on the difference;
A power control method, including:

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