JP7226224B2 - Control device, control method and computer program - Google Patents

Description

The present disclosure relates to control devices, control methods, and computer programs.

Independent power facilities that are separated from the commercial power system can continue to supply power to important loads for a long period of time without being affected by the commercial power system, such as power outages. is. On the other hand, it is not possible to receive assistance regarding power supply for unbalanced power supply and demand, or maintenance of power quality such as voltage or frequency. For this reason, methods for adjusting the balance of power supply and demand and maintaining power quality are important for self-sustaining power facilities.

There are two types of self-sustaining electric power equipment: a storage battery type in which a storage battery is mainly responsible for maintaining voltage and frequency, and a generator type in which a generator is mainly responsible for maintaining voltage and frequency. In storage battery-type electric power equipment, the high-speed switching technology that accompanies the development of power electronics technology enables the output of the storage battery to be switched extremely quickly and accurately according to the power required by the load.

Patent Literature 1 discloses a control method for a microgrid including storage batteries and generators.

WO2015/001800

However, in self-contained power equipment, the power consumption of the load may fluctuate when a new load is introduced (connected or paralleled) or the load is disconnected from the power equipment. Even in such a case, it is necessary to supply power to the load without over-discharging or over-charging the storage battery.

The present disclosure has been made in view of such circumstances, and provides a storage battery and a power generation system capable of coping with fluctuations in power consumption of a load while preventing the storage battery from being over-discharged or over-charged. The object is to provide a control device for a machine.

A control device according to an aspect of the present disclosure is a control device that controls a storage battery and a generator included in a self-sustaining power facility, and indicates the power consumption of a load that is input to or disconnected from the power facility. A storage battery output range acquisition unit that acquires an output range of the storage battery determined based on a load fluctuation amount and a rated output of the storage battery, and power consumption of the load included in the power equipment and the storage battery output range acquisition unit and a generator output range determination unit that determines the output range of the generator based on the acquired output range of the storage battery.

A control method according to another aspect of the present disclosure is a control method for controlling a storage battery and a generator included in a self-sustaining power facility, wherein a computer controls a load connected to or disconnected from the power facility. a step of acquiring an output range of the storage battery determined based on a load fluctuation amount indicating the power consumption of the storage battery and a rated output of the storage battery; and determining a power range of the generator based on the power range of the storage battery.

A computer program according to another aspect of the present disclosure is a computer program for causing a computer to function as a control device that controls a storage battery and a generator included in an autonomous power facility, wherein the computer controls the power a storage battery output range acquisition unit that acquires an output range of the storage battery determined based on a load fluctuation amount indicating power consumption of a load that is input to or disconnected from the facility and a rated output of the storage battery; and the power equipment. and the output range of the storage battery acquired by the storage battery output range acquisition unit.

Needless to say, the above computer program can be distributed via a computer-readable non-temporary recording medium such as a CD-ROM (Compact Disc-Read Only Memory) or a communication network such as the Internet. . The present disclosure can also be implemented as a semiconductor integrated circuit that implements part or all of the control device, or as a system that includes the control device.

According to the present disclosure, it is possible to cope with fluctuations in power consumption of the load while preventing the storage battery from being over-discharged or over-charged.

FIG. 1 is a diagram showing an example of the configuration of an independent power facility. FIG. 2 is a diagram showing an example of output ranges of a storage battery and a generator. FIG. 3 is a diagram showing a range in which the load can be operated in the output ranges of the storage battery and generator shown in FIG. FIG. 4 is a diagram showing a generalized output range of a storage battery and a generator. FIG. 5 is a diagram showing a range in which the load can be operated in the output ranges of the storage battery and generator shown in FIG. FIG. 6 is a diagram for explaining load operation conditions. FIG. 7 is a block diagram showing the functional configuration of the control device. FIG. 8 is a diagram showing an example of outputs of a storage battery and a generator, and power consumption of a load. FIG. 9A is a diagram showing an example of operating efficiency of a storage battery. FIG. 9B is a diagram illustrating an example of operating efficiency of a generator; FIG. 10 is a flow chart showing the processing procedure of the control device according to the embodiment of the present disclosure.

[Outline of Embodiment of Present Disclosure]
First, an overview of the embodiments of the present disclosure will be listed and described.
(1) A control device according to an embodiment of the present disclosure is a control device that controls a storage battery and a generator included in a self-sustaining power facility, wherein the a storage battery output range acquisition unit that acquires an output range of the storage battery determined based on a load fluctuation amount indicating power consumption and a rated output of the storage battery; power consumption of the load included in the power equipment; and the storage battery output. and a generator output range determination unit that determines the output range of the generator based on the output range of the storage battery acquired by the range acquisition unit.

According to this configuration, the output range of the storage battery can be determined based on the load fluctuation amount and the rated output of the storage battery. Therefore, the output range of the storage battery can be determined so that the storage battery will not be over-discharged or over-charged even if there is a change in the power consumption of the load fluctuation amount. Also, the output range of the generator can be determined based on the power consumption of the load and the output range of the storage battery. For this reason, it is possible to cause the power generator to output the shortage of the power consumption required to operate the load that cannot be covered by the output of the storage battery. This makes it possible to cope with fluctuations in the power consumption of the load.

(2) Preferably, the control device described above further includes a charge/discharge state determination unit that determines the charge/discharge state of the storage battery based on the remaining charge of the storage battery, and the storage battery output range acquisition unit includes: Based on the charge/discharge state determined by the charge/discharge state determining unit, an output range of the storage battery corresponding to the charge/discharge state is acquired.

According to this configuration, it is possible to determine whether the storage battery is in a charged state or a discharged state based on the remaining charge of the storage battery, and to determine the output range of the storage battery based on the charge/discharge state. This makes it possible to determine the output range of the storage battery so that the storage battery will not be over-discharged or over-charged even if there is a change in the power consumption of the load fluctuation amount.

(3) More preferably, the above-described control device is further based on the output range of the storage battery acquired by the storage battery output range acquisition unit and the output range of the generator determined by the generator output range determination unit. and an operation efficiency optimizing unit that determines the output of the storage battery and the output of the generator that optimizes the operation efficiency of the storage battery and the generator.

According to this configuration, the operating efficiency of the storage battery and the generator can be optimized within the output range of the storage battery and the output range of the generator. Thereby, a storage battery and a generator can be operated at low cost.

(4) A control method according to another embodiment of the present disclosure is a control method for controlling a storage battery and a generator included in a self-sustaining power facility, wherein a computer connects or disconnects the power facility. a step of obtaining an output range of the storage battery determined based on a load fluctuation amount indicating the power consumption of the load to be supplied and the rated output of the storage battery; and determining the power range of the generator based on the obtained power range of the storage battery.

This configuration includes steps corresponding to the characteristic processing units included in the control device described above. Therefore, according to this configuration, it is possible to obtain the same actions and effects as those of the control device described above.

(5) A computer program according to another embodiment of the present disclosure is a computer program for causing a computer to function as a control device that controls a storage battery and a generator included in an autonomous power facility, wherein the computer is a storage battery output range acquisition unit that acquires the output range of the storage battery determined based on a load fluctuation amount indicating the power consumption of the load that is input to or disconnected from the power equipment and the rated output of the storage battery; It functions as a generator output range determination unit that determines the output range of the generator based on the power consumption of the load included in the power equipment and the output range of the storage battery acquired by the storage battery output range acquisition unit.

According to this configuration, the computer can function as the control device described above. Therefore, it is possible to obtain the same actions and effects as those of the control device described above.

[Details of the embodiment of the present disclosure]
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be noted that each of the embodiments described below is a specific example of the present disclosure. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples and do not limit the present disclosure. In addition, among the components in the following embodiments, components not described in independent claims are components that can be added arbitrarily. Each figure is a schematic diagram and is not necessarily strictly illustrated.

Moreover, the same code|symbol is attached|subjected to the same component. Since their functions and names are also the same, description thereof will be omitted as appropriate.

In this embodiment, a control device that controls a storage battery and a generator included in an independent electric power facility will be described.

[Regarding self-sustaining power equipment]
First, the self-sustaining power equipment targeted by this embodiment will be described. In addition, in this disclosure, a storage battery type self-sustaining power facility is assumed.

FIG. 1 is a diagram showing an example of the configuration of an independent power facility.

The independent power facility 1 includes a storage battery 11 , a generator 12 , an important load 13 , a safety load 14 , a normal load 15 , a solar power generator 16 and a wind power generator 17 .

Each of the power devices 11 to 17 installed in the self-sustaining power facility 1 is connected to a power line 20. FIG. Power line 20 is connected to power system 21 .

An interconnection circuit breaker 22 is provided in the path between the power system 21 and the self-sustaining power equipment 1 . The interconnection circuit breaker 22 is, for example, a vacuum circuit breaker, and connects (parallel) the self-sustaining power equipment 1 to the power system 21 and disconnects (parallel-off) the self-sustaining power equipment 1 from the power system 21. switch between That is, by closing the interconnection circuit breaker 22, the self-sustaining power equipment 1 is connected in parallel with the power system 21, and by opening the interconnection circuit breaker 22, the self-sustaining power equipment 1 connects to the power system 21 disconnect from

The storage battery 11 includes, for example, a secondary battery such as a redox flow (RF) battery, a lithium ion battery, a molten salt battery, or a lead storage battery. Storage battery 11 is connected to power line 20 via a power conditioner, a battery management system, or the like.

The generator 12 is, for example, a gas generator that generates power by burning gas such as city gas. Note that the generator 12 may be a fuel cell that extracts electric power from the chemical energy of fuel such as hydrogen.

The important load 13 is a load that must be guaranteed to operate for a certain period of time even when power is not supplied from the power system 21 due to a power failure or the like. Examples of such devices include experimental equipment that requires long-term experiments and medical equipment used in hospitals.

The safety load 14 is a load that operates for safety when power is not supplied from the power system 21 due to a power failure or the like. An example is an emergency light.

The normal load 15 is a general load that does not require guaranteed operation time like the important load. An air conditioner is one example.

The solar power generator 16 is an example of a renewable energy generator that uses renewable energy to generate power, and converts solar energy into DC power. In addition, the solar power generator 16 is connected to the power line 20 via a power conditioner. Also, the photovoltaic generator 16 is considered a load with a negative output.

The wind power generator 17 is an example of a renewable energy power generator that uses renewable energy to generate power, and converts wind energy into DC power. The wind power generator 17 is connected to the power line 20 via a power conditioner. Also, the wind generator 17 is regarded as a load with a negative output.

[Regarding the conditions of the output range of the storage battery 11 and the generator 12]
Here, in a state in which the self-sustaining power equipment 1 is disconnected from the power system 21 and is in self-sustaining operation, the storage battery 11 and the generator can operate the load without overcharging or over-discharging the storage battery 11. 12 output range conditions will be described.

FIG. 2 is a diagram showing an example of the output ranges of the storage battery 11 and the generator 12. As shown in FIG. As shown in FIG. 2, the output range of the storage battery 11 is assumed to be between -500 kW and 500 kW. It is assumed that the storage battery 11 discharges in the positive output range and charges the storage battery 11 in the negative output range. Also, the output range of the generator 12 is assumed to be between 900 kW and 1800 kW. This is the output range after starting the generator 12 and shifting to the steady operation state.

FIG. 3 is a diagram showing a range in which loads (all loads) can be operated within the output ranges of storage battery 11 and generator 12 shown in FIG. The left side (i) of FIG. 3 shows the load operable range when the storage battery 11 is charged, and the right side (ii) of FIG. 3 shows the load operable range when the storage battery 11 is discharged.

As shown in (i) of FIG. 3, when the storage battery 11 is charged without operating the generator 12, the total output of the storage battery 11 and the generator 12 (hereinafter simply referred to as "total output") is -500 kW to 0 kW. Further, the total output when the generator 12 is operated and the storage battery 11 is charged is 400 kW to 1800 kW. Therefore, the operable ranges of the load when the storage battery 11 is charged are -500 kW to 0 kW and 400 kW to 1800 kW.

On the other hand, as shown in (ii) of FIG. 3, the total output when the storage battery 11 is discharged without operating the generator 12 is 0 kW to 500 kW. Further, the total output when the generator 12 is operated and the storage battery 11 is discharged is 900 kW to 2300 kW. Therefore, the load operation range (total power consumption of all loads) when the storage battery 11 is discharged is 0 kW to 500 kW and 900 kW to 2300 kW.

In this way, there are discontinuous ranges 61 and 62 in which the load operating range is discontinuous when the storage battery 11 is discharged and charged.

In the range 61, the load cannot be operated with the storage battery 11 in a charged state. Therefore, the storage battery 11 may be over-discharged. For example, when operating a load with a power consumption of 200 kW within the range 61, the storage battery 11 cannot be charged, but can be discharged. For this reason, the storage battery 11 must be constantly discharged, and eventually it will be over-discharged.

On the other hand, in the range 62, the load cannot be operated after the storage battery 11 is discharged. Therefore, overcharging may occur. For example, when operating a load with a power consumption of 800 kW within the range 62, the storage battery 11 cannot be discharged, but can be charged. For this reason, the storage battery 11 must be constantly charged, and eventually it will be overcharged.

Therefore, it is necessary to determine the output range of the storage battery 11 and the generator 12 in which the load can be operated without the storage battery 11 being overcharged or overdischarged.

FIG. 4 is a diagram showing a generalized output range of the storage battery 11 and the generator 12. As shown in FIG. As shown in FIG. 4, the output range of the storage battery 11 is assumed to be between -AkW and BkW. It is assumed that the storage battery 11 discharges in the positive output range and charges the storage battery 11 in the negative output range. Also, the output range of the generator 12 in the steady operation state is assumed to be between CkW and DkW. However, A, B, C and D are all positive values.

FIG. 5 is a diagram showing a range in which loads (all loads) can be operated within the output ranges of storage battery 11 and generator 12 shown in FIG. The left side (i) of FIG. 5 shows the load operable range when the storage battery 11 is charged, and the right side (ii) of FIG. 5 shows the load operable range when the storage battery 11 is discharged.

As shown in (i) of FIG. 5, the total output when the storage battery 11 is charged without operating the generator 12 is -AkW to 0kW. Further, the total output when the generator 12 is operated and the storage battery 11 is charged is (-A+C)kW to DkW. Therefore, the operable range of the load when the storage battery 11 is charged is -A kW to 0 kW and (-A+C) kW to D kW. A condition for preventing a discontinuous range from occurring in the operating range of the load during charging of the storage battery 11 can be expressed by Equation 1 below.
-A + C ≤ 0 (Equation 1)

On the other hand, as shown in (ii) of FIG. 5, the total output when the storage battery 11 is discharged without operating the generator 12 is 0 kW to B kW. Further, the total output when the generator 12 is operated and the storage battery 11 is discharged is CkW to (D+B)kW. Therefore, the operating range of the load when the storage battery 11 is discharged is 0 kW to B kW and C kW to (D+B) kW. A condition for preventing a discontinuous range from occurring in the operating range of the loads (total power consumption of all loads) when the storage battery 11 is discharged can be expressed by Equation 2 below.
C≦B (Equation 2)

In many cases, the maximum charging power A and the maximum discharging power B of the storage battery 11 are the same. Therefore, it is assumed that A=B in the following description. Equations 1 and 2 can then be summarized in Equation 3 below.
C≤A (=B) ... (Formula 3)

Therefore, Expression 1 and Expression 2 or Expression 3 is used as a condition regarding the output range of storage battery 11 and generator 12 . Therefore, it is assumed that the storage battery 11 and the generator 12 are operated under these conditions.

[Regarding load operation conditions]
Next, a detailed description will be given of load operation conditions in a state in which the self-sustained power equipment 1 is disconnected from the power system 21 and is operating in a self-sustaining manner.
FIG. 6 is a diagram for explaining load operating conditions. FIG. 6 shows the total output range (ranges 71 and 72) during discharging of the storage battery 11 shown in FIG. 5 and the range (ranges 73 and 74) of the total output during charging of the storage battery 11 shown in FIG. ing. When the conditions regarding the output range of the storage battery 11 and the generator 12 shown in Equation 3 are satisfied, the range of the total output when the storage battery 11 is discharged is 0 kW to (D + B) kW, and the total output when the storage battery 11 is charged. The range is -AkW to DkW.

Therefore, in the range 75 (0 kW to D kW) in which the two ranges of total output overlap, the storage battery 11 can be in either a charged state or a discharged state. That is, in the range 75, the storage battery 11 can switch between charging and discharging. Therefore, it is possible to control the storage battery 11 so as not to be over-discharged or over-charged. Therefore, by keeping the load operation range (power consumption of all loads) within the range 75, it is possible to stably operate the loads while avoiding a situation where power cannot be supplied to the loads. Therefore, under the condition that Expression 3 is satisfied, the following Expression 4 is used as the load operation condition. However, the lower limit value of the load operating range does not need to be strictly 0, and may be a value slightly greater than 0. Similarly, the upper limit of the load operating range does not need to be strictly D, and may be a value slightly smaller than D.
0≦load operating range≦D (Formula 4)
In this embodiment, the load is operated so that the total output of the load satisfies Equation 4.

[Regarding the control device 3]
Referring to FIG. 1, control device 3 is connected to power devices 11 to 17 installed in self-sustaining power facility 1 via communication line 23 . The control device 3 receives information on the remaining charge (SOC: State of Charge) from the storage battery 11 and controls the operation of the storage battery 11 based on the received SOC information. The control device 3 controls the operation of the generator 12 . Control device 3 receives current power consumption information from storage battery 11 , safety load 14 and normal load 15 . The control device 3 receives information on the generated power from the solar power generator 16 and controls the operation of the solar power generator 16 if the output of the solar power generator 16 can be controlled. The control device 3 receives information on generated power from the wind power generator 17 and controls the operation of the wind power generator 17 if the output of the wind power generator 17 can be controlled.

FIG. 7 is a block diagram showing the functional configuration of the control device 3. As shown in FIG.
When the self-sustaining power facility 1 shown in FIG. 1 is disconnected from the power system 21 and operates in a self-sustaining manner, the control device 3 stably operates the load and optimizes the operating efficiency of the storage battery 11 and the generator 12. The storage battery 11 and the generator 12 are controlled so as to do so. Here, the load refers to the important load 13, the safety load 14 and the normal load 15. Note that the load may include the solar power generator 16 and the wind power generator 17 .

The control device 3 includes a communication unit 31 , a charge/discharge state determination unit 32 , a storage battery output range acquisition unit 33 , a generator output range determination unit 34 , an operation efficiency optimization unit 35 and a storage unit 36 .

Specifically, the control device 3 may be configured as a computer system including a microprocessor, ROM (Read Only Memory), RAM (Random Access Memory), HDD (Hard Disk Drive), and the like. For example, the control device 3 loads a computer program stored in the HDD into the RAM and executes the computer program on the microprocessor. Thereby, each of the processing units 31 to 35 is functionally realized.

The communication unit 31 communicates with each of the power devices 11 to 17 of the self-sustaining power facility 1 . Specifically, communication unit 31 receives information on the SOC and output (charge/discharge power) of storage battery 11 from storage battery 11 . The communication unit 31 receives information on the output (generated power) of the generator 12 from the generator 12 . The communication unit 31 receives power consumption information from the important load 13 , the security load 14 and the normal load 15 . Note that the communication unit 31 may receive power consumption information from smart taps to which the important load 13, the security load 14, and the normal load 15 are connected. The communication unit 31 receives output (generated power) information from the solar power generator 16 and the wind power generator 17 . The communication unit 31 transmits control commands for controlling the operation of these devices to the storage battery 11 and the generator 12 .

The charge/discharge state determination unit 32 receives SOC information from the storage battery 11 via the communication unit 31 . The charge/discharge state determination unit 32 determines the charge/discharge state indicating whether the storage battery 11 is in the charge state or the discharge state by comparing the received SOC with a predetermined threshold value. For example, the charge/discharge state determination unit 32 determines to discharge the storage battery 11 when the SOC is 50% or more (or more than 50%), and when the SOC is less than 50% (or 50%). In the following cases), it is determined to put the storage battery 11 into a discharged state.

The storage battery output range acquisition unit 33 acquires the output range of the storage battery 11 according to the charge/discharge state based on the charge/discharge state determined by the charge/discharge state determination unit 32 . Specifically, the storage battery information 42 stored in the storage unit 36 indicates the output range of the storage battery 11 when the storage battery 11 is in a discharged state and the output range of the storage battery 11 when the storage battery 11 is in a charged state. ing.

Here, the output range of the storage battery 11 will be described. Assume that the rated output of the storage battery 11 is -A kW to B kW (where A and B are positive values). It is assumed that the storage battery 11 discharges in the positive output range and charges the storage battery 11 in the negative output range. Also, the maximum power consumption (load fluctuation amount) of the load to be disconnected or input to the self-sustaining power equipment 1 is defined as Pmax (kW).

FIG. 8 is a diagram showing an example of the outputs of the storage battery 11 and the generator 12 and the power consumption of the load. The horizontal axis indicates time, and the vertical axis indicates power.

When a load with a load fluctuation amount Pmax (kW) is applied to the self-contained power equipment 1, the power consumption of the load (the total power consumption of the load) in the self-contained power equipment 1 increases by Pmax (kW). In this case, in order to supply the power required to drive the load, the storage battery 11 must increase its output by Pmax (kW). Therefore, the storage battery 11 must always ensure an output margin of Pmax. Therefore, it is necessary to control the storage battery 11 so that the output of the storage battery 11 is (B-Pmax) kW or less.

On the other hand, when the load with the load fluctuation amount Pmax (kW) is disconnected from the independent power equipment 1, the power consumption of the load in the independent power equipment 1 decreases by Pmax (kW). In this case, the output of the storage battery 11 must be reduced by the power consumption Pmax (kW). Therefore, the storage battery 11 must always ensure an output margin of -Pmax (kW). Therefore, it is necessary to control the storage battery 11 so that the output of the storage battery 11 is (-A+Pmax) kW or higher.

Combining these two conditions, the storage battery 11 needs to be operated in the output range of (-A+Pmax) kW to (B-Pmax) kW. 0 kW to (B−Pmax) kW is the output range of the storage battery 11 when the storage battery 11 is in a discharged state (hereinafter referred to as “positive output range of the storage battery 11”), and (−A+Pmax) kW to 0 kW This is the output range of the storage battery 11 in the charged state (hereinafter referred to as "negative output range of the storage battery 11").

Referring to FIG. 7 again, battery output range acquisition unit 33 acquires information on the positive output range of storage battery 11 from storage battery information 42 when the charge/discharge state of storage battery 11 is the discharge state. In addition, when the charge/discharge state of the storage battery 11 is the charged state, the storage battery output range acquisition unit 33 acquires information on the negative output range of the storage battery 11 from the storage battery information 42 .

The storage battery output range acquisition unit 33 calculates the positive output range and the negative output range of the storage battery 11 from the rated power (-AkW to BkW) of the storage battery 11 and the load fluctuation amount Pmax (kW). good too.

The generator output range determination unit 34 determines the output range of the generator 12 based on the power consumption of the load included in the self-sustaining power equipment 1 and the output range of the storage battery 11 acquired by the storage battery output range acquisition unit 33. do. Specifically, generator output range determination unit 34 receives the power consumption of loads 13 to 17 via communication unit 31 . The generator output range determining unit 34 determines the output range of the generator 12 by subtracting the output range of the storage battery 11 from the power consumption of the load (total power consumption of the load).

For example, the power consumption of the load is PkW, and the output range of the storage battery 11 is a positive output range (0kW to (B-Pmax)kW). In this case, the generator output range determination unit 34 determines the output range of the generator 12 to be PkW to (P-(B-Pmax))kW.

Similarly, the power consumption of the load is PkW, and the output range of the storage battery 11 is the negative output range ((-A+Pmax) kW to (B-Pmax) kW). In this case, the generator output range determining unit 34 determines the output range of the generator 12 as (P-(-A+Pmax)) kW to (P-(B-Pmax)) kW.

This makes it possible to determine the output range of the generator 12 in which the output of the generator 12 compensates for the shortage of the power required to operate the load.

The operating efficiency optimization unit 35 optimizes the storage battery 11 and the generator based on the output range of the storage battery 11 acquired by the storage battery output range acquisition unit 33 and the output range of the generator 12 determined by the generator output range determination unit 34. The outputs of the storage battery 11 and the generator 12 that optimize the operating efficiency of the battery 12 are determined.

Specifically, the storage battery information 42 stored in the storage unit 36 includes information indicating the operation efficiency of the storage battery 11, and the generator information 43 stored in the storage unit 36 includes the operation efficiency of the generator 12. shall include information indicating The operating efficiency optimization unit 35 reads information indicating the operating efficiency of the storage battery 11 from the storage battery information 42 stored in the storage unit 36 . The operating efficiency optimization unit 35 also reads information indicating the operating efficiency of the generator 12 from the generator information 43 stored in the storage unit 36 .

FIG. 9A is a diagram showing an example of operating efficiency of the storage battery 11. FIG. The horizontal axis of the graph shown in FIG. 9A indicates the output P1 of the storage battery 11, and the vertical axis indicates the operating efficiency C1 (P1) of the storage battery 11 with respect to the output P1 of the storage battery 11. As shown in FIG. Here, the operating efficiency C1 (P1) may be in an inversely proportional relationship with the operating cost of the storage battery 11, for example. Also, the operating efficiency C1 (P1) can be approximated, for example, by a second-order or higher polynomial with the output P1 as a variable.

FIG. 9B is a diagram showing an example of the operating efficiency of the generator 12. FIG. The horizontal axis of the graph shown in FIG. 9B indicates the output P2 of the generator 12, and the vertical axis indicates the operating efficiency C2 (P2) of the generator 12 with respect to the output P2 of the generator 12. As shown in FIG. Here, the operating efficiency C2 (P2) may be in an inversely proportional relationship with the operating cost of the generator 12, for example. Also, the operating efficiency C2 (P2) can be approximated, for example, by a second-order or higher polynomial with the output P2 as a variable.

The operating efficiency optimization unit 35 satisfies Equation 5 below in the output range of the storage battery 11 and the output range of the generator 12, and optimizes the objective function f (P1, P2) shown in Equation 6 below (here, Calculate the outputs P1 and P2 to be maximized. For example, the operating efficiency optimization unit 35 calculates P1 and P2 that minimize the objective function according to nonlinear programming.
Power consumption of load = P1 + P2 (Formula 5)
f(P1, P2)=C1(P1)+C2(P2) (Formula 6)

The operation efficiency optimization unit 35 transmits a control command including the calculated output P1 of the storage battery 11 to the storage battery 11 via the communication unit 31 . Further, the operating efficiency optimization unit 35 transmits a control command including the calculated output P2 of the generator 12 to the generator 12 via the communication unit 31 .

[Output Control Processing of Storage Battery 11 and Generator 12]
Next, output control processing of the storage battery 11 and the generator 12 by the control device 3 will be described.

FIG. 10 is a flow chart showing the processing procedure of the control device 3 according to the embodiment of the present disclosure.

The charge/discharge state determination unit 32 acquires information on the remaining charge (SOC) of the storage battery 11 from the storage battery 11 via the communication unit 31 (S1).

The charge/discharge state determination unit 32 compares the acquired SOC with a predetermined threshold TH (eg, TH=50%), and determines whether the SOC is equal to or greater than the threshold TH, thereby determining the charge/discharge state of the storage battery 11. is determined (S2).

When it is determined that the SOC is equal to or higher than TH (YES in S2), the charge/discharge state determination unit 32 determines that the charge/discharge state of the storage battery 11 is the discharge state, and the storage battery output range acquisition unit 33 Information on the positive output range of the storage battery 11 is acquired from the storage battery information 42 stored in the storage unit 36 (S3). The storage battery output range acquisition unit 33 outputs information on the positive output range of the storage battery 11 to the generator output range determination unit 34 and the operation efficiency optimization unit 35 . FIG. 8 shows 0 kW to (B-Pmax) kW as an example of the positive output range of the storage battery 11 (output range when the storage battery 11 is discharged).

When it is determined that the SOC is less than TH (NO in S2), the charge/discharge state determination unit 32 determines that the charge/discharge state of the storage battery 11 is the charge state, and the storage battery output range acquisition unit 33 Information on the negative output range of the storage battery 11 is obtained from the storage battery information 42 stored in the storage unit 36 (S4). The storage battery output range acquisition unit 33 outputs information on the positive output range of the storage battery 11 to the generator output range determination unit 34 and the operation efficiency optimization unit 35 . FIG. 8 shows (−A+Pmax) kW to 0 kW as an example of the negative output range of the storage battery 11 (the output range when the storage battery 11 is charged).

The generator output range determination unit 34 receives power consumption of the loads 13 to 17 via the communication unit 31 . The generator output range determining unit 34 determines the output range of the generator 12 by subtracting the output range of the storage battery 11 from the power consumption of the load (total power consumption of the load) (S5). The generator output range determination unit 34 outputs information on the determined output range of the generator 12 to the operation efficiency optimization unit 35 .

The operating efficiency optimization unit 35 reads information indicating the operating efficiency of the storage battery 11 as shown in FIG. 9A from the storage battery information 42 stored in the storage unit 36 . Also, the operating efficiency optimization unit 35 reads information indicating the operating efficiency of the generator 12 as shown in FIG. 9B from the generator information 43 stored in the storage unit 36 . The operation efficiency optimization unit 35 optimizes the output P1 of the storage battery 11 and the output P2 of the generator 12 that satisfies Expression 5 and optimizes the objective function shown in Expression 6 in the output range of the storage battery 11 and the output range of the generator 12. Calculate (S6).

FIG. 8 shows the output P1 of storage battery 11 and the output P2 of generator 12 . The output P1 of the storage battery 11 is controlled so as to be within the positive output range or the negative output range of the storage battery 11 . Further, the output P2 of the generator 12 is the output P1 of the storage battery 11 from the power consumption P3 of the load. As a result, the output P2 of the generator 12 can compensate for the shortage of the power P3 required to operate the load.

The operation efficiency optimization unit 35 transmits a control command indicating the output P1 of the storage battery 11 obtained by optimization to the storage battery 11 via the communication unit 31, and sends a control command indicating the output P2 of the generator 12 to the communication unit 31. to the generator 12 (S7). The storage battery 11 and the generator 12 control their outputs according to the control command sent from the operation efficiency optimization unit 35 .

[Effect of Embodiment]
As described above, according to the embodiment of the present disclosure, the output range of the storage battery 11 can be determined based on the load fluctuation amount Pmax and the rated output (AkW to BkW) of the storage battery 11. Therefore, the output range of the storage battery 11 can be determined so that the storage battery 11 will not be over-discharged or over-charged even if the power consumption fluctuates by the load fluctuation amount Pmax. Also, the output range of the generator 12 can be determined based on the power consumption of the load and the output range of the storage battery 11 . For this reason, it is possible to cause the power generator 12 to output the shortfall that cannot be covered by the output of the storage battery 11 of the power consumption required to operate the load. This makes it possible to cope with fluctuations in the power consumption of the load.

Further, it is possible to determine whether the storage battery 11 is in a charged state or a discharged state based on the remaining charge (SOC) of the storage battery 11, and to determine the output range of the storage battery 11 based on the charging/discharging state. As a result, the output range of the storage battery 11 can be determined so that the storage battery 11 will not be over-discharged or over-charged even if the power consumption fluctuates by the load fluctuation amount Pmax.

Moreover, the operating efficiency of the storage battery 11 and the generator 12 can be optimized within the output range of the storage battery 11 and the output range of the generator 12 . Thereby, the storage battery 11 and the generator 12 can be operated at low cost.

[Note]
It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present disclosure is indicated by the scope of the claims rather than the above-described meaning, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

1 self-sustaining power equipment 3 control device 11 storage battery 12 generator 13 important load 14 security load 15 normal load 16 solar power generator 17 wind power generator 20 power line 21 power system 22 interconnection circuit breaker 23 communication line 31 communication unit 32 charging Discharge state determination unit 33 Storage battery output range acquisition unit 34 Generator output range determination unit 35 Operating efficiency optimization unit 36 Storage unit 42 Storage battery information 43 Generator information 61 Range 62 Range 71 Range 73 Range 75 Range

Claims (5)

A control device that controls a storage battery and a generator included in an autonomous power facility,
a storage battery output range acquisition unit that acquires an output range of the storage battery determined based on a load fluctuation amount indicating the power consumption of the load that is input to or disconnected from the power equipment and a rated output of the storage battery;
a generator output range determination unit that determines the output range of the generator based on the power consumption of the load included in the power equipment and the output range of the storage battery acquired by the storage battery output range acquisition unit; Control device. moreover,
A charge/discharge state determination unit that determines the charge/discharge state of the storage battery based on the remaining charge of the storage battery,
The control device according to claim 1, wherein the storage battery output range acquisition unit acquires the output range of the storage battery according to the charge/discharge state determined by the charge/discharge state determination unit. moreover,
The operating efficiency of the storage battery and the generator is optimized based on the output range of the storage battery acquired by the storage battery output range acquisition unit and the output range of the generator determined by the generator output range determination unit. 3. The control device according to claim 1, further comprising an operation efficiency optimization unit that determines the output of said storage battery and the output of said generator. A control method for controlling a storage battery and a generator included in an autonomous power facility,
a computer obtaining an output range of the storage battery determined based on a load fluctuation amount indicating the power consumption of the load to be applied to or disconnected from the power equipment and a rated output of the storage battery;
A control method, comprising the step of determining the output range of the generator based on the power consumption of a load included in the power equipment and the acquired output range of the storage battery. A computer program for causing a computer to function as a control device that controls a storage battery and a generator included in an autonomous power facility,
said computer,
a storage battery output range acquisition unit that acquires an output range of the storage battery determined based on a load fluctuation amount indicating the power consumption of the load that is input to or disconnected from the power equipment and a rated output of the storage battery;
To function as a generator output range determination unit that determines the output range of the generator based on the power consumption of the load included in the power equipment and the output range of the storage battery acquired by the storage battery output range acquisition unit , a computer program.

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