WO2020022182A1

WO2020022182A1 - Electric power control device and electric power control method

Info

Publication number: WO2020022182A1
Application number: PCT/JP2019/028279
Authority: WO
Inventors: 直森田
Original assignee: ソニー株式会社
Priority date: 2018-07-26
Filing date: 2019-07-18
Publication date: 2020-01-30
Also published as: JP7380563B2; JPWO2020022182A1

Abstract

Provided is an electric power control device that can appropriately conduct electric power interchange through an AC power system while maintaining the AC power system in a stable state. An electric power control device (100) comprises: a current control unit (120) that controls a bidirectional AC-DC converter to control input and output currents between the bidirectional AC-DC converter and an AC transmission line in accordance with an electric power control instruction from an external power management device; an electric power quantity acquiring unit (130) that acquires an actual interchanged electric power quantity inputted and outputted by the bidirectional AC-DC converter during an electric power interchange period based on the electric power control instruction; and a notifying unit (140) that notifies the power management device of information regarding the actual interchanged electric power quantity calculated by the electric power quantity acquiring unit during the electric power interchange period.

Description

Power control device and power control method

This disclosure relates to a power control device and a power control method.

から From the viewpoint of resource protection, there is a mechanism that installs a storage battery in the home or the like, stores power generated by solar panels or the like in the storage battery, and sells surplus power through the existing AC power system. For example, Patent Literature 1 discloses a technology of a power supply system for appropriately storing and selling power to and from a storage battery through an AC power system.

JP 2011-097795 A

In the power control that sends the power stored in the storage battery to the other storage battery via the AC power system, if the required power is accurately output to the system, the voltage of the system is not constant. It is necessary to change the current according to the fluctuation. However, a change in input / output current with respect to the system may cause an unstable state such as oscillation.

Therefore, the present disclosure proposes a new and improved power control device and power control method capable of appropriately performing power interchange through the AC power system while keeping the AC power system in a stable state.

According to the present disclosure, according to a power control instruction from an external power management device, a current control unit that controls an input / output current between the bidirectional AC / DC converter and an AC transmission line, and the power control instruction Based on the input and output of the bidirectional AC-DC converter, the power amount acquisition unit for acquiring the actual interchange power amount during the power interchange period, and the actual interchange power amount calculated by the power amount acquisition unit during the power interchange period And a notifying unit for notifying the power management device of the above information.

According to the present disclosure, according to a power control instruction from an external power management device, a current control unit that controls an input / output current between the bidirectional AC / DC converter and an AC transmission line, and the power control instruction. A power amount acquisition unit that acquires the target power amount designated by the formula (1) and the actual interchange power amount input and output by the bidirectional AC / DC converter, and calculates a difference, the current control unit comprising: A power control device is provided that controls input / output current to the bidirectional AC / DC converter based on a difference calculated by an acquisition unit.

According to the present disclosure, according to a power control instruction from an external power management device, controlling the input / output current between the bidirectional AC / DC converter and the AC transmission line, and based on the power control instruction. The bidirectional AC / DC converter has input and output, to obtain the actual interchange power amount during the power interchange period, and to notify the power management device of the information on the actual interchange power amount during the power interchange period, A power control method is provided.

According to the present disclosure, according to the power control instruction from the external power management device, controlling the input / output current between the bidirectional AC / DC converter and the AC transmission line, and specifying the power control instruction. The obtained target power amount and the actual interchange power amount input and output by the bidirectional AC / DC converter are periodically acquired, a difference is calculated, and based on the difference, the bidirectional AC / DC converter And controlling the input / output current.

As described above, according to the present disclosure, a new and improved power control device and power control method 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 any of the effects shown in the present specification or other effects that can be grasped from the present specification are used together with or in place of the above effects. May be played.

1 is an explanatory diagram illustrating an example of an overall configuration of a power supply system according to an embodiment of the present disclosure. FIG. 3 is an explanatory diagram illustrating a configuration example of a power supply system by extracting two bases. It is explanatory drawing which shows an example of a scenario. FIG. 3 is an explanatory diagram illustrating a functional configuration example of the power control device according to the embodiment; 4 is a flowchart showing an operation example of the power management device according to the embodiment. 4 is a flowchart showing an operation example of the power control device according to the embodiment. 4 is a flowchart showing an operation example of the bidirectional DC / AC converter according to the embodiment. FIG. 4 is an explanatory diagram showing an example of an operation sequence by the operation of the power supply system according to the embodiment. FIG. 4 is an explanatory diagram showing an example of an operation sequence by the operation of the power supply system according to the embodiment. FIG. 4 is an explanatory diagram showing an example of an operation sequence by the operation of the power supply system according to the embodiment. It is explanatory drawing which shows an example of a change of a target electric energy and an accumulated electric energy. FIG. 14 is an explanatory diagram for describing effects of the embodiment.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the specification and the drawings, components having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted.

The description will be made in the following order.
1. 1. Embodiment of the present disclosure 1.1. Configuration example 1.2. Operation example 2. Conclusion

<1. Embodiment 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 illustrating an example of an overall configuration of a power supply system according to an embodiment of the present disclosure. Hereinafter, an overall configuration example of the power supply system according to the embodiment of the present disclosure will be described with reference to FIG.

電力 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 the sites is controlled by a power management device (Power @ Management Center; also referred to as PMC) 10. FIG. 1 shows three

pole transformers

20a, 20b, and 20c. In the present embodiment, the power exchange between the bases under the same pole transformer is most effective, but the power interchange beyond the pole transformer is naturally also possible. The power management apparatus 10 acquires the current value of the AC power system 1 measured by the AC power meter (AMR) 30 via the communication line COM.

において In the configuration shown in FIG. 1, the bases at which power can be exchanged through the AC power system 1 are the bases A-1, A-3, B-1, and C-2. Taking the site A-1 as an example, the site A-1 includes a power control device (Power Control Device; also referred to as PCD) 100a, a bidirectional DC / AC converter (Power Conditioning System) (PCS) 200a, and an AC power meter. 300a, a power storage device 400a, and a solar power generation device 500a (in the following description, the power control device 100, the bidirectional DC / AC converter 200, the AC power meter 300, the power storage device 400, and the power storage device 400, respectively) Photovoltaic power generation device 500).

The power control device 100a is a device that controls power interchange between the location A-1 and another location (for example, location A-3). For example, when the power stored in the power storage device 400a is decreasing and it is desired that the power be transferred to another site, the power control device 100a transmits the power to the power management device 10 through the communication line COM. Request for accommodation. When receiving the accommodation instruction from the power management apparatus 10, the power control apparatus 100 a controls the bidirectional DC / AC converter 200 a to receive the electric power through the AC power system 1.

(4) The same applies to a case where the power stored in the power storage device 400a is increasing and the power can be exchanged to another base. In this case, the power control device 100a notifies the power management device 10 via the communication line COM that power is available. When receiving the accommodation instruction from the power management device 10, the power control device 100 a controls the bidirectional DC / AC converter 200 a to supply power to the AC power system 1.

(4) The power control device 100a acquires information on the amount of power that has actually been exchanged when electric power is exchanged with another site. The power supplied by the AC power system 1 is not always constant in voltage, and as a result of fluctuations in voltage, it may not be possible to accommodate a planned power amount (scheduled power amount). Therefore, the power control device 100a acquires information on the amount of power actually used (actually provided power), and transmits information on the amount of available power to the power management device 10. Here, when the difference between the scheduled power amount and the actual interchange power amount is equal to or greater than the predetermined threshold, the power management apparatus 10 instructs that the power interchange for correcting the difference be performed between the sites.

(4) The voltage of the AC power system 1 varies depending on the fluctuation of the load connected from the AC power meter and the amount of power generated by the photovoltaic power generator. However, the power control device 100a does not use the voltage for calculating the control current of the bidirectional DC / AC converter 200a, but uses only the assumed reference voltage for calculating the control current. As the integrated power value of the AC wattmeter, the effective power accumulated value calculated by multiplying the actual voltage and the actual current by the power factor is output, so the power control device 100a holds the accumulated power at the start of the interchange, , The accumulated value from the AC wattmeter at the end of the interchange is read, and the actually accommodated electric energy is calculated.

The bidirectional DC / AC converter 200a is a converter having a function of converting AC power into DC power and converting DC power into AC power. The bidirectional DC / AC converter 200a operates under the control of the power control device 100a when power is exchanged with another site. The bidirectional DC / AC converter 200a monitors the current value of the AC power and controls the input / output current using the monitored current value when the power is exchanged with another site.

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

In the present embodiment, the power unit of 1 kWH power of the power company is Cp, the price unit agreed between the two sides of the power transmission side and the power reception side is Ca, and in the condition of Cp> Ca, the reverse power flow on the power transmission side is provided in the interchange period Tx. When the power Ps and the power Pr on the power receiving side satisfy Ps <Pr, it is assumed that the power receiving side has purchased the difference from the power company in the power price unit Cp. On the other hand, when Ps> Pr, the difference is settled assuming that the power company has purchased power in the power price unit Ca.

FIG. 2 is an explanatory diagram showing an example of the configuration of a power supply system by extracting two bases. FIG. 2 shows two locations, a location A-1 and a location B-1. In FIG. 2, there are two

loads

50a and 50c at the site A-1, but the load 50a uses AC power and the load 50c uses DC power. In FIG. 2, the load 50b and the AC generator 600 are shown at the site B-2. The load 50b uses AC power.

The

power control devices

100a and 100f respectively read scenarios that specify a power generation schedule of the power generation device (for example, the power generation schedule of the photovoltaic power generation device 500a), a power consumption schedule, a power sale price of power, a purchase price of power, and the like. Based on the scenario and the power storage amounts of the

power storage devices

400a and 400f, the power management device 10 applies for power interchange.

FIG. 3 is an explanatory diagram showing an example of a scenario. FIG. 3 shows, as scenarios, the time series power consumption at the base, the maximum power storage amount (MaxＭSOC) and the minimum power storage amount (Min SOC) of the power storage device in time series. The power control device 100a refers to this scenario, applies for power selling when the power amount of the power storage device 400a is considered to be excessive, and purchases power when the power amount of the power storage device 400a is considered to be insufficient. Apply. Further, in the scenario shown in FIG. 3, when the price (Grid price) when purchasing power from the power company through the AC power system 1 is high, the purchase from the power company is suppressed, and the time period when the Grid price is low is low. Is set to be purchased from a power company.

In response to a request from each power control device connected via the communication line COM, the power management device 10 calculates the amount of power that can be exchanged between the power control devices, and calculates an accommodation schedule synchronized with the available power pattern. To the power control device. The accommodating power pattern is, for example, such that an electric power of 1.0 kWh is accommodated for 30 minutes.

The power control device 100a calculates the current control pattern of the bidirectional DC / AC converter 200a according to the power pattern received from the power management device 10 and the interchange schedule. From the given power pattern, the amount of current is calculated based on the reference voltage and the 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 200 V and when the reference voltage is 100 V, the amount of current of the bidirectional DC / AC converter 200 a is twice different.

The power control device 100a controls the current of the bidirectional DC / AC converter 200a according to the power pattern calculated by the power management device 10. Here, power interchange control is performed so that consumption of a load connected inside the ammeter ir1 is not included in the interchange 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 always becomes 0A.

One of the features of the power supply system according to the embodiment of the present disclosure is that, as shown in FIG. 1, a site where the power control device is provided and a site where the power control device is not provided can be mixed. It is. In other words, the site where the power control device is provided can not only receive the power supply from the AC power system 1 but also exchange power with another site where the power control device is provided. is there. On the other hand, the site where the power control device is not provided receives only the power from the AC power system 1, but does not receive the power supply from the site where the power control device is provided. It does not affect the power supply from the base where the device is provided.

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

FIG. 4 is an explanatory diagram illustrating a functional configuration example of the power control device 100 according to the 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.

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

The accommodation pattern generation unit 110 reads a scenario, acquires the amount of power storage (State Of ｈ Charge; SOC) of the power storage device 400, and generates an electric power interchange pattern. The generated accommodation pattern is sent to the power management apparatus 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 the 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 performs the actual accommodation during the power accommodation period input and output by the bidirectional DC / AC converter 200 and indicated by the power control instruction from the power management device 10. Obtain information on the amount of power. Specifically, the power amount acquisition unit 130 determines the power amount measured by the AC wattmeter 300a at the start time of the power interchange period, and the power amount measured by the AC wattmeter 300a at the end time of the power interchange period. To get.

The notification unit 140 executes a notification to the power management apparatus 10. For example, the notification unit 140 performs a process of notifying the power management apparatus 10 of the accommodation pattern generated by the accommodation pattern generation unit 110. Further, for example, the notification unit 140 performs a process of notifying the power management apparatus 10 of the information on the actual amount of power acquired by the power amount acquisition unit 130 during the power accommodation period. The notification unit 140 notifies the power management apparatus 10 of the information on the actual amount of power exchanged during the power exchange period, so that the power management apparatus 10 determines the difference between the scheduled amount of electric power exchanged during the power exchange period and the actual amount of exchanged electric power. The power interchange for the correction can be instructed to the power control apparatus 100 at the site where the power interchange was performed.

The power control apparatus 100 according to the embodiment of the present disclosure having such a configuration generates a power interchange pattern and notifies the power management apparatus 10 of the power interchange pattern, and also manages information on the actual interchange power amount during the power interchange period by power management. The device 10 can be notified. By operating in this manner, power control apparatus 100 according to the embodiment of the present disclosure temporarily changes the voltage of AC power system 1, and makes a difference between the scheduled amount of electric power and the actual amount of electric power at the time of electric power interchange. Occurs, it becomes easy to correct the difference in the power rate based on the difference in the amount of power when the power management apparatus 10 setstle the power rate.

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

Above, the functional configuration example of the power control device 100 according to the embodiment of the present disclosure has been described with reference to FIG. Subsequently, an operation example 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 operation example of the power management apparatus 10 according to the embodiment of the present disclosure. Hereinafter, an operation example of the power management apparatus 10 according to the embodiment of the present disclosure will be described using FIG.

When the power management apparatus 10 starts operating, first, it determines whether or not there is a request for power accommodation from the power control apparatus 100 (step S101). The power management apparatus 10 waits until there is a request for power interchange from the power control apparatus 100 (step S101, No).

(4) If there is a request for power accommodation from the power control apparatus 100 (step S101, Yes), it is determined whether or not the request matches the power accommodation request from another power control apparatus 100 (step S102). The power interchange request from the power control device 100 includes information on the power supply available time, the minimum power, the maximum power, the power amount, and the price range.

In FIG. 5, the power management apparatus 10 determines whether or not the power management apparatus 100 conforms to a power interchange request from another power control apparatus 100. However, the power company that supplies power to the AC power system 1 also Can be chosen as a partner for accommodation.

If the request does not match the request for power accommodation from another power control apparatus 100 (step S102, No), the power management apparatus 10 adds the acquired power accommodation request to the accommodation reservation list (step S103), and proceeds to step S101. The process returns to the process of waiting for an accommodation request.

On the other hand, if the request matches the power interchange request from the power control apparatus 100 (step S102, Yes), the power management apparatus 10 sets the interchange pattern and the start time between the interchange pairs, and sets the data to the matched interchange pair. Is transmitted (step S104).

For example, when the power management apparatus 10 determines the power control apparatus 100a at the location A-1 and the power control apparatus 100e at the location B-1 as an accommodation pair, the

power management apparatuses

100a and 100e provide the power accommodation pattern and the start time. Send the information.

(4) Thereafter, when the start time comes, power interchange between the interchangeable pairs determined by the power management apparatus 10 starts. Then, the power management apparatus 10 waits until receiving an accommodation completion notification from the power control apparatus 100 at the site where the power accommodation is performed (step S105). Upon receiving the accommodation end notification (Step S105, Yes), the power management apparatus 10 receives the end information from the two accommodated power control apparatuses 100, and acquires the difference between the planned accommodation power amount and the actual accommodation power amount. (Step S106).

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

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

In the above, the operation example of the power management apparatus 10 according to the embodiment of the present disclosure has been described with reference to FIG. Subsequently, an operation example of the power control device 100 according to the embodiment of the present disclosure will be described.

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

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 required in the future (step S111). Then, as a result of the calculation of the amount of power, power control device 100 determines whether the amount of power stored in power storage device 400 and the amount of power consumption required by a load or the like is more than 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 apparatus 100 generates a power interchange pattern in the interchange pattern generation unit 110 and transmits the power interchange pattern to the power management apparatus 10 (step S113). At this time, the power control apparatus 100 may notify the power management apparatus 10 of the information on the power sale price when the power is provided. On the other hand, if the excess or deficiency is not equal to or greater than the specified value (No in step S112), the power control apparatus 100 skips the processing in step S113.

(4) Subsequently, the power control device 100 determines whether or not there has been 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 apparatus 100 records the values of the AC wattmeter 300 at the start and end of the power interchange, and notifies the power management apparatus 10 of the difference (step S115). On the other hand, when there is no accommodation instruction from the power management apparatus 10 (step S114, No), the power control apparatus 100 returns to the processing 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 apparatus 100 according to the embodiment of the present disclosure has been described above with reference to FIG. Subsequently, an operation example 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 operation example of the bidirectional DC / AC converter 200 according to the embodiment of the present disclosure. Hereinafter, an operation example of the bidirectional DC / AC converter 200 according to the embodiment of the present disclosure will be described using FIG.

When the bidirectional DC / AC converter 200 starts operation, 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 or not the current value ir of the flowing current is within the regulation of the control current value ic when executing the 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 is controlled. The operation is performed so as to be within the regulation of the current value ic (step S123).

Subsequently, as a result of changing the control target value, the bidirectional DC / AC converter 200 determines whether or not the current value ir of the flowing current is within the regulation of the control current value ic (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 (No in step S124), the bidirectional DC / AC converter 200 outputs a generator (for example, AC power) when the reverse tide current is large. Of the load (for example, the load 50b) when the received 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 with reference to FIG. Subsequently, an example of an operation sequence according to an operation of the power supply system according to the embodiment of the present disclosure will be described.

FIG. 8 is an explanatory diagram illustrating an example of an operation sequence by 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 locations A-1 and B-1 included in the power supply system according to the embodiment of the present disclosure.

It is assumed that the power management pattern has been generated in the two locations A-1 and B-1 in advance, and the power management apparatus 10 has determined that the demands for the power exchange between the two locations A-1 and B-1 match. I do. From time t1 to time t2, power accommodation is performed based on the power accommodation pattern. Here, it is assumed that the site A-1 has a power supply of 20 amps for 30 minutes, and the site B-1 supplies power of 10 amps for 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 drawn, the amount of power supplied and supplied varies. Therefore, for example, even when 1 kWh of power is exchanged, the location A-1 can supply only 0.9 kWh of power, and the location B-1 may receive 1.1 kWh of power. .

The power management apparatus 10 generates such an error as a result of the scheduled accommodation. If the difference is equal to or more than an allowable value, the power management apparatus 10 compensates for the error by the main power company connected to the AC power system 1. Assuming that the above has been performed, the power charge for the error is settled. In the example of FIG. 8, the site A-1 sells 0.9 kWh of power to the site B-1, and the site B-1 purchases 0.9 kWh at a price agreed between the sites A-1 and B-1. However, the additional 0.2 kWh shall be purchased from a power company.

Conversely, if the base A-1 transmits more power than planned and the base B-1 receives less power than planned, the amount of large discharge is determined by the specified price of the power company or the base A-1 or B-1. Shall be sold at the lower price agreed between them.

In the present embodiment, the power interchange for correcting the difference is executed again between the sites A-1 and B-1. In other words, the power management apparatus 10 instructs the power supply apparatus 10 to supply the insufficient power of 0.1 kWh to the site A-1, and to transmit the power of 0.1 kWh, which has received much power, to the site B-1. In the example of FIG. 8, the point B-1 returns the power of 0.1 kWh to the AC power system 1 from time t3 to t4, and the power of the point A-1 is 0.1 kWh between time t5 and t6. To the AC power system 1.

In addition, the power management apparatus 10 calculates the arbitration fee for the power interchange between the bases and the supplementary power fee for the power transmission loss due to the length of the route to be interchanged, and calculates a bill to each customer by using a prescribed formula. May be.

FIG. 9 is an explanatory diagram showing changes in the currents of the power supply, the load, and the battery in time series. FIG. 9 shows a change in current at the bases A-1, B-1, and C-2 in FIG. 1 and an AC wattmeter 300 at another base (for example, a base A-3 in FIG. 1) and sunlight. An example of a change in current of the power generation device 500, the two loads 50, and the power storage device 400 is illustrated.

負荷 Before time t1, the power of power storage device 400 is used by the load. Thereafter, between the times t1 and t2, the base A-3 buys the electric power sold from the base A-1 for 25 yen / kWh. A part of the power supplied by the power purchase is stored in the power storage device 400, and the rest is used by the load.

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

で At time t4, the power purchase from the base B-1 ends. Then, before the time t4, the 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 there is room in the amount of power stored in power storage device 400, site A-3 sells power to site C-2 at a rate of 30 yen / kWh between time t5 and time t6.

The power management apparatus 10 manages the start time and the end time of the power purchase and sale at the site A-3. As the amount of power at that time, a value calculated by AC power meter 300 and notified from power control device 100 is used. Therefore, even if the power prices of the respective bases are different, one power meter per base can appropriately process. In the example of FIG. 9, the total value of the purchase and purchase electric power prices of the base A-3 is (Pt2-Pt1) × 25 yen + (Pt4-Pt3) × 28 yen− (Pt6-Pt5) × 30 yen. In this equation, Pt1 to Pt6 indicate the values of AC wattmeter 300 at times t1 to t6, respectively.

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

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

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

Specifically, the power control device 100 obtains a system voltage value from information of the AC power meter 300, calculates an average voltage value from the value, and stores the average voltage value in the variable V. Further, the power control device 100 holds the command power value from the power management device 10 in a variable P. The power control apparatus 100 stores the power flow time and the reverse power flow time in a variable t.

Next, 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, for example, the power amount acquisition unit 130. If the variable t is equal to or less than 0 (step S133, Yes), the power control device 100 ends the processing. On the other hand, if the variable t has not become equal to or less than 0 (No at Step S133), the power control apparatus 100 determines whether the variable P and t held at Step S132 or the variables P and t updated at Step S135 described below are used. Then, the current value of the bidirectional DC / AC converter 200 is calculated to instruct the bidirectional DC / AC converter 200, and the variable value is updated using the information obtained from the AC wattmeter 300 (step S134). The process of step S134 can be executed by, for example, the current control unit 120.

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

Then, after waiting for a certain time Δt, the power control device 100 updates the variable value using the information from the AC power meter 300 (step S135). The process of step S135 can be executed by, for example, the power amount acquisition unit 130. Specifically, after waiting for a certain time Δt in step S135, power control device 100 obtains the accumulated power amount from AC wattmeter 300 and calculates difference ΔWh from variable W. The power control apparatus 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 apparatus 100 returns to the determination processing in step S133.

The power control apparatus 100 performs the series of operations illustrated in FIG. 10 to periodically calculate the accumulated power amount with respect to the target power amount provided from the power management device 10 and correct the difference as needed. can do. Then, the power control apparatus 100 can reduce the final error between the target power amount and the accumulated power amount by executing the series of operations illustrated in FIG.

FIG. 11 is an explanatory diagram showing an example of changes in the target power amount and the accumulated 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 power amount.

At time t1, if it is found that there is a difference between the target power amount curve P1 and the accumulated power amount Psum, the power control apparatus 100 updates the target power amount and sets a new control current value. Is applied to the bidirectional DC / AC converter 200 to try to reduce the error.

At time t2, if it is found that there is a difference between the target power amount curve P2 and the accumulated power amount Psum, the power control apparatus 100 updates the target power amount and adds a new control current. By giving the value to the bidirectional DC / AC converter 200, an attempt is made to reduce the error.

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

制御 By performing the control as described above, the power control apparatus 100 can periodically calculate the accumulated power amount with respect to the target power amount provided from the power management device 10 and correct the difference as needed. Then, the power control apparatus 100 can reduce the final error between the target power amount and the accumulated power amount.

FIG. 12 is an explanatory diagram illustrating effects of the embodiment of the present disclosure. FIG. 12 shows two bases A-1 and X-1. The base A-1 has the configuration according to the embodiment of the present disclosure, and the base X-1 has different ACs for power transmission and power reception. It has a configuration in which a power meter is provided.

Since the tariff system is different between power purchase and power sale, at base X-1, the amount of power generated by the photovoltaic power generator (PV) is measured by one watt hour meter (AMR2) to calculate the power sale fee. On the other hand, the power consumption must be measured by another watt hour meter (AMR1) to calculate the power purchase fee. In addition, at the site X-1, there is also a system in which a specific load can be supplied by an inverter (INV) in preparation for the occurrence of a power failure, but the reverse power flow is not used.

On the other hand, the base A-1 can clearly understand the power rate from the amount of power when selling and purchasing power and the interchange time. Therefore, there is an effect that only one AC wattmeter is required at the site A-1.

<2. Summary>
As described above, according to the embodiment of the present disclosure, a power control device provided in a power supply system capable of exchanging power via an AC power system, and a bidirectional DC / AC converter A power control device is provided that controls 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 power amounts at the start and end of the power interchange at the time of the power interchange, so that the planned power amount and the actual interchange power amount are provided. Can be grasped.

Although the 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 obvious that a person having ordinary knowledge in the technical field of the present disclosure can arrive at various changes or modifications within the scope of the technical idea described in the claims. It is naturally understood that these also belong to the technical scope of the present disclosure.

効果 In addition, the effects described in this specification are merely illustrative or exemplary and not restrictive. That is, the technology according to the present disclosure can exhibit other effects that are obvious to those skilled in the art from the description in the present specification, in addition to or instead of the above effects.

Note that the following configuration also belongs to the technical scope of the present disclosure.
(1)
According to a power control instruction from an external power management device, a current control unit that controls input / output current between the bidirectional AC / DC converter and the AC transmission line,
Based on the power control instruction, the bidirectional AC / DC converter input and output, a power amount acquisition unit that acquires the actual interchange power amount during the power interchange period,
In the power interchange period, a notification unit that notifies the power management device of information on the actual interchange power amount calculated by the power amount acquisition unit,
A power control device comprising:
(2)
The power control device according to (1), wherein the notification unit requests the power management device to provide power through the AC transmission line when the power needs to be provided.
(3)
The power control device according to (2), wherein the notification unit requests the power management device for power accommodation 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 using 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 a storage amount of a storage battery.
(8)
The power supply according to any one of (2) to (7), wherein the notification unit requests the power management device to exchange power based on a state of a power storage device connected to the bidirectional AC / DC converter. Control device.
(9)
The power according to any one of (1) to (8), wherein the current control unit controls an input / output current based on a reference voltage of the AC transmission line to which the bidirectional AC / DC converter is connected. Control device.
(10)
The current control unit bidirectionally exchanges power interchange corresponding to the difference at a predetermined timing when a difference between the scheduled amount of power exchanged during the power exchange period and the actual amount of power exchanged is equal to or greater than a predetermined threshold. The power control device according to any one of (1) to (9), which issues an instruction to the 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 sale price when providing power.
(12)
According to a power control instruction from an external power management device, a current control unit that controls input / output current between the bidirectional AC / DC converter and the AC transmission line,
A target power amount specified by the power control instruction, and an actual interchange power amount input and output by the bidirectional AC / DC converter, and a power amount obtaining unit that calculates a difference;
With
The power control device, wherein the current control unit controls 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 obtains the target power amount and the actual interchange power amount and calculates a difference during the power interchange period specified by the power control instruction. apparatus.
(14)
According to a power control instruction from an external power management device, controlling the input / output current between the bidirectional AC / DC converter and the AC transmission line,
Based on the power control instruction, the bidirectional AC / DC converter has input and output, to obtain the actual interchange power amount during the power interchange period,
Notifying the power management device of the information on the actual amount of electric power in the electric power interchange period,
And a power control method.
(15)
According to a power control instruction from an external power management device, controlling the input / output current between the bidirectional AC / DC converter and the AC transmission line,
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 are periodically acquired, and the difference is calculated.
Controlling input / output current to the bidirectional AC / DC converter based on the difference;
And a power control method.

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

Claims

According to a power control instruction from an external power management device, a current control unit that controls input / output current between the bidirectional AC / DC converter and the AC transmission line,
Based on the power control instruction, the bidirectional AC / DC converter input and output, a power amount acquisition unit that acquires the actual interchange power amount during the power interchange period,
In the power interchange period, a notification unit that notifies the power management device of information on the actual interchange power amount calculated by the power amount acquisition unit,
A power control device comprising:
2. The power control device according to claim 1, wherein the notification unit requests the power management device to provide power through the AC transmission line when the necessity of power exchange occurs.
The power control device according to claim 2, wherein the notification unit requests the power management device for power accommodation based on a predetermined power scenario.
4. The power control device according to claim 3, wherein the predetermined power scenario includes a power consumption schedule by a load that uses 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 claim 3, wherein the predetermined power scenario includes an amount of power stored in a storage battery.
The power control device according to claim 2, wherein the notification unit requests the power management device to provide power interchange based on a state of a power storage device connected to the bidirectional AC / DC converter.
The power control device according to claim 1, wherein the current control unit controls an input / output current based on a reference voltage of the AC transmission line to which the bidirectional AC / DC converter is connected.
The current control unit bidirectionally exchanges power interchange corresponding to the difference at a predetermined timing when a difference between the scheduled amount of power exchanged during the power exchange period and the actual amount of power exchanged is equal to or greater than a predetermined threshold. The power control device according to claim 1, wherein an instruction is given to a DC converter.
2. The power control device according to claim 1, wherein the notification unit notifies the power management device of information on a power selling price when providing power.
According to a power control instruction from an external power management device, a current control unit that controls input / output current between the bidirectional AC / DC converter and the AC transmission line,
A target power amount specified by the power control instruction, and an actual interchange power amount input and output by the bidirectional AC / DC converter, and a power amount obtaining unit that calculates a difference;
With
The power control device, wherein the current control unit controls 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 12, wherein the power amount acquisition unit acquires the target power amount and the actual interchange power amount during a power interchange period designated by the power control instruction, and calculates a difference. .
According to a power control instruction from an external power management device, controlling the input / output current between the bidirectional AC / DC converter and the AC transmission line,
Based on the power control instruction, the bidirectional AC / DC converter has input and output, to obtain the actual interchange power amount during the power interchange period,
Notifying the power management device of the information on the actual amount of electric power in the electric power interchange period,
And a power control method.
According to a power control instruction from an external power management device, controlling the input / output current between the bidirectional AC / DC converter and the AC transmission line,
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 are periodically acquired, and the difference is calculated.
Controlling input / output current to the bidirectional AC / DC converter based on the difference;
And a power control method.