JP6321466B2 - Supply and demand management system - Google Patents

Description

  The present invention relates to a supply and demand management system.

  A supply and demand management system (hereinafter also referred to as “CEMS”) that manages power in one building or an area including one building is used from “A to B” for facilities in the building or area. A demand response (DR) command such as “Reduce power by CkW” is issued, and power supply and demand management of the entire area being managed is performed (see, for example, Patent Document 1).

JP 2008-295193 A

  However, in response to a reduction command for “CkW reduction” in the DR command, a building or the like that has received the DR command cannot always achieve “CkW reduction” as a reduction command. For example, when a DR command having a reduction target that is too large is issued, the reduction target cannot be achieved in a building that has received the DR command, and the entire area managed by the CEMS may not be able to be achieved.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a supply and demand management system capable of improving the achievement probability of a DR command.

In order to achieve the above object, the present invention provides the following means.
The supply and demand management system according to the present invention is provided with a lower supply and demand management device that performs power management on a management target, and an upper supply and demand management device that instructs a power reduction target to the lower supply and demand management device. The lower-level supply and demand management device includes a control unit that performs power management of the management target based on the power reduction target, a demand power amount in the management target, and a power amount that can be reduced in the demand power amount. A prediction unit that predicts power information that is information; and an output unit that outputs the power information predicted by the prediction unit to the higher-order supply and demand management device. A storage unit that stores the power information output from the unit and a power reduction target that is determined based on at least the amount of power that can be reduced included in the power information. An instruction section for outputting a power reduction target to the lower supply management device, but is characterized by being at least provided.

  According to the supply and demand management system of the present invention, the upper supply and demand management apparatus sets a power reduction target based on the information on the amount of power that can be reduced included in the power information output from the lower supply and demand management apparatus. Is output to the subordinate supply and demand management device. For this reason, the power reduction target determined in the higher-order supply / demand management apparatus is a power reduction target that has a high probability of being achieved by the lower-order supply / demand management apparatus.

  In the above invention, the management target includes a secondary battery capable of charging and discharging electric power, and the prediction unit of the lower-level supply and demand management device acquires information on the power capacity stored in the secondary battery. And the output unit outputs the acquired information on the power capacity to the higher-level supply and demand management device, and the instruction unit is configured to output the power based on at least the information on the power amount that can be reduced and the information on the power capacity. It is preferable to set a reduction target.

  In this way, by including the secondary battery in the management target and adding the information on the power capacity of the secondary battery to determine the power reduction target, it can be achieved with the low-order supply and demand management device when the secondary battery is included in the management target It becomes easier to increase the probability.

  In the above invention, the control unit performs control to cause the secondary battery to function as a backup power source and a peak shift power source, and the power capacity information includes information on a backup power capacity used as the backup power source, and Preferably, the instruction unit determines the power reduction target based on the information on the peak shift power capacity.

  As described above, the information on the secondary battery power capacity is divided into the backup power capacity information and the peak shift power capacity information, and the power reduction target is determined based on the peak shift power capacity information. It becomes easier to further increase the probability that can be achieved by the low-order supply and demand management device when a secondary battery is included.

  In the above invention, the management target includes a distributed power source, and the prediction unit supplies the amount of power supplied by the distributed power source from the predicted value of the power amount required by the load facility included in the management target as the demand power amount. It is preferable to obtain the amount of power excluding the predicted value.

  In this way, when the distributed power source is included in the management target, the subordinate demand-and-supply management device uses the power amount obtained by subtracting the amount of power supplied by the distributed power source from the amount of power required by the load facility. It becomes easier to increase the probability of achieving the reduction target.

According to the supply and demand management system of the present invention,
Based on the information on the amount of power that can be reduced included in the power information output from the lower-level supply and demand management device, the upper-level supply and demand management device sets a power reduction target and outputs this power reduction target to the lower-level supply and demand management device The DR command achievement probability can be improved.

It is a model diagram explaining the structure of the supply-and-demand management system which concerns on one Embodiment of this invention. It is a graph explaining the electric power information estimated by the estimation part of FIG. 1, and the information of electric power capacity. It is a graph explaining the outline | summary of the discharge in the secondary battery of FIG. It is a graph explaining the content of the discharge control in the secondary battery of FIG.

  A demand management system according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the lower-order supply and demand management device 20 (hereinafter also referred to as “BEMS 20”) and the upper-order supply and demand management device 10 (hereinafter also referred to as “CEMS 10”) whose management targets for managing the supply and demand of power are the buildings 30. Description will be made by applying to an example of the supply and demand management system 1 provided. In addition, although this embodiment applied and demonstrated to the example whose management object is the building 30, facilities other than the building which exists in the area containing the building 30 may be sufficient, several buildings, several facilities, The combination of buildings and facilities may be a management target or a region may be a target, and is not particularly limited.

  As shown in FIG. 1, the CEMS 10 is a high-order supply and demand management device arranged between the electric power company 15 and the BEMS 20. The CEMS 10 is a demand response command (hereinafter referred to as “DR”) that is a power reduction target of demand power to the BEMS 20. Command ") is output. In FIG. 1, a state in which the BEMS 20 is arranged under the CEMS 10 is shown. However, under the CEMS 10, in addition to the BEMS 20 that is a supply and demand management device for the building 30, a supply and demand management device for other facilities is arranged. Alternatively, both may be mixed.

  The CEMS 10 is a computer system having a CPU (Central Processing Unit), ROM, RAM, hard disk, input / output interface, and the like. The control program stored in the ROM or the like causes the CPU to function at least as the instruction unit 11 that controls the load facility 31, the secondary battery 32, and the distributed power source 33, and the power information input from the BEMS 20 includes the hard disk and the like. It is made to function as the memory | storage part 12 memorize | stored.

  The instruction unit 11 determines the DR command and outputs the determined DR command to the BEMS 20. The storage unit 12 stores power information input from the BEMS 20. When determining the DR command, the instruction unit 11 calls the power information stored in the storage unit 12, and determines the DR command based on the called power information.

  The BEMS 20 manages the load equipment 31, the secondary battery 32, and the distributed power source 33 arranged in the building 30, and manages the demand of power in the building 30 by controlling these. . The BEMS 20 is a computer system having a CPU (Central Processing Unit), ROM, RAM, hard disk, input / output interface, and the like. The control program stored in the ROM or the like causes the CPU to function at least as the control unit 21 that controls the load facility 31, the secondary battery 32, and the distributed power source 33, and the prediction unit 22, and outputs an input / output interface. The unit 23 functions at least.

  The load facility 31 is a generic name for devices that consume power, such as lighting fixtures installed in the building 30 and air conditioning facilities. The secondary battery 32 may be any battery that can charge the power supplied from the outside of the building 30 and supply the power charged in the secondary battery 32 to the load facility 31. It is not limited. The distributed power source 33 is a power generation facility installed in the building 30, and may be a power generation facility using renewable natural energy such as a solar power generation facility or a wind power generation facility, or may be a small motor. A power generation facility using a power source may be used.

  The control unit 21 controls power consumption in the load facility 31 based on the DR command input from the CEMS 10. In addition, it controls the charging and discharging of power to the secondary battery 32, and controls the amount of power generated by the distributed power source 33.

  The prediction unit 22 predicts information on the amount of power demand such as the amount of power demand per unit time in the load facility 31 and information on the amount of power generated such as the amount of power generated per unit time in the distributed power source 33. In the present embodiment, the power information output from the BEMS 20 to the CEMS 10 will be described by being applied to an example in which information on the amount of generated power is subtracted from information on the amount of power demand.

  As shown in FIG. 2, the power information is stored in the first area A1 in which the demand power cannot be reduced, the second area A2 in which the demand power can be reduced, and the third area A3 in which the demand power can be easily reduced. Divided. In other words, the sum of the first area A1, the second area A2, and the third area A3 is equal to the power information. Here, as an example of the second region A2, there is an amount of electric power that can be reduced by weakening the ability of the air conditioner to adjust the room temperature. As an example of the third region A3, there is an amount of electric power that can be reduced by turning off the electricity in the hallway.

  In the present embodiment, the power information is applied to an example in which the power information is divided into three regions of the first region A1, the second region A2, and the third region A3 according to the extent to which the demand power can be reduced. Although described, it is possible to divide an area where power demand reduction is impossible to an easy area into more than three areas and prioritize reduction of demand power.

  Further, the prediction unit 22 also acquires power capacity information that is the sum of the backup power capacity information B1 and the peak shift power capacity information B2 stored in the secondary battery 32. The backup power capacity is a capacity in which power to be supplied from the secondary battery 32 to the load facility 31 when a power failure or the like in which the power supply to the building 30 is interrupted occurs. The peak shift power capacity is the amount of power that is charged at night when the unit price of power is relatively low, and the power supplied to the load facility 31 during the daytime when the power demand during the day when the unit price of power is high is peak. Capacity.

  The output unit 23 outputs the power information in the load facility 31 predicted by the prediction unit 22 and the power capacity information in the secondary battery 32 acquired by the prediction unit 22 to the storage unit 12 of the CEMS 10.

Next, control when outputting a DR command in the supply and demand management system 1 of the present embodiment will be described.
First, as shown in FIG. 2, the prediction unit 22 of the BEMS 20 predicts power information every predetermined time (for example, every hour) and acquires information on the power capacity of the secondary battery 32. Thereafter, as illustrated in FIG. 1, the power information predicted by the output unit 23 and the acquired power capacity information are output to the CEMS 10. The predicted power information output to the CEMS 10 and the acquired power capacity information are stored in the storage unit 12.

  Thereafter, when the instruction unit 11 of the CEMS 10 outputs a DR command to the BEMS 20, the predicted power information stored in the storage unit 12 and the acquired power capacity information are called. The instruction unit 11 obtains a reduced power amount that is likely to be achieved by the BEMS 20 based on the values of the third area A3 and the second area A2 in the called predicted power information.

  Further, the instruction unit 11 obtains the amount of power that can be supplied from the secondary battery 32 to the load facility 31 based on the information on the power capacity, and obtains the reduced power amount that the BEMS 20 is likely to achieve. Here, how to obtain the amount of electric power that can be supplied from the secondary battery 32 to the load facility 31 will be described with reference to FIGS. 3 and 4.

  The SOC (State of charge) capacity in the secondary battery 32 has an upper limit and a lower limit, as shown in FIG. When a secondary battery 32 is requested to discharge XkW from A to B, the secondary battery 32 discharges XkW over a period from A to B. FIG. 3 shows an example in which power is linearly discharged from the upper limit to the lower limit.

  Note that the discharge amount per unit time (gradient of the graph) in the secondary battery 32 has an upper limit specific to the secondary battery 32. Further, the lower limit may be determined based on the backup power capacity in the secondary battery 32. By doing in this way, even after the peak shift power capacity is used up by the DR command, the backup power capacity is secured, so that power supply to the load facility 31 can be secured even at the time of a power failure or the like.

  In general, the secondary battery 32 whose charge amount is controlled by the BEMS 20 or the like is charged to a predetermined capacity at a predetermined timing exemplified by a predetermined time of the day (for example, an unclear time such as 3 am). To be controlled. In the present embodiment, description will be made by applying to an example in which a predetermined capacity is a set upper limit.

  FIG. 4 shows an example in which the secondary battery 32 is charged to the set upper limit at Tchf which is a predetermined timing. In FIG. 4, Ts indicates a discharge start time, and Ts + A indicates a time when discharge is performed from the start of discharge to the set lower limit with an upper limit discharge amount per unit time. Tchf-B indicates the charging start time when the secondary battery 32 is charged up to the set upper limit at Tchf when charged with the upper limit charge amount per unit time from the set lower limit.

  When the instructing unit 11 instructs the secondary battery 32 to discharge (range (1) in FIG. 4), a discharge amount per unit time exceeding the upper limit discharge amount α is requested (in the case indicated by the graph L1). The parameters, discharge start Ts, discharge end Te, and discharge capacity m are adjusted, and control is performed so that the discharge amount per unit time is less than the upper limit discharge amount α (for example, control is performed so as to obtain a graph L2). ).

  When discharge is performed with the discharge amount controlled as described above (range (2) in FIG. 4), when the discharge end time is earlier than Tshf-B (for example, indicated by graph L3), the setting is performed. The secondary battery 32 is discharged until reaching the lower limit.

  On the other hand, if the discharge end time is later than Tshf-B, in other words, if the graph L4 indicating discharge intersects the graph L5 when charging the secondary battery 32 to the set upper limit at Tchf, The instructing unit 11 performs control for advancing the discharge end Te or reducing the discharge capacity m.

When performing control to reduce the discharge capacity m, the instruction unit 11 obtains an intersection C between the graph L4 and the graph L5, and performs control to obtain the discharge capacity m up to the intersection C.
According to the supply and demand management system 1 configured as described above, the CEMS 10 determines the DR command based on the values of the third region A3 and the second region A2 included in the power information output from the BEMS 20, and the DR command is used as the BEMS 20 Is output. For this reason, the DR command determined in the CEMS 10 is a DR command having a high probability that it can be achieved by the BEMS 20, and it is easy to improve the success probability.

  By including the secondary battery 32 in the management target and adding the information on the power capacity of the secondary battery 32 to define the DR command, it is easy to increase the probability that can be achieved by the BEMS 20 when the secondary battery 32 is included in the management target. Become.

  Information on the power capacity of the secondary battery 32 is divided into backup power capacity information B1 and peak shift power capacity information B2, and a DR command is determined based on the peak shift power capacity information B2. When the secondary battery 32 is included, the probability that can be achieved by the BEMS 20 can be further increased.

  When the distributed power source 33 is included in the management target, the BEMS 20 achieves the DR command by setting the amount of power obtained by subtracting the amount of power supplied by the distributed power source 33 from the amount of power requested by the load facility 31 as the demand power amount. It becomes easier to increase the probability of being able to do it.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the BEMS 20 is described as applied to an example of managing the three of the load facility 31, the secondary battery 32, and the distributed power source 33 arranged in the building 30. Two of the batteries 32 or two of the load facility 31 and the distributed power source 33 may be managed, or only the load facility 31 may be managed, and is not particularly limited.

  DESCRIPTION OF SYMBOLS 1 ... Supply-demand management system, 10 ... CEMS (higher demand-supply management apparatus), 11 ... Instruction | indication part, 12 ... Memory | storage part, 20 ... BEMS (lower-order supply-demand management apparatus), 21 ... Control part, 22 ... Prediction part, 23 ... Output part , 30 ... Building, 31 ... Load equipment, 32 ... Secondary battery, 33 ... Distributed power supply

Claims (3)

A subordinate supply and demand management device that performs power management on the management target;
An upper demand and supply management device that instructs a power reduction target to the lower supply and demand management device;
A supply and demand management system with
In the subordinate supply and demand management device,
A control unit that performs power management of the management target based on the power reduction target;
A prediction unit that predicts power information that is information on the amount of power demand in the management target and the amount of power that can be reduced in the power demand amount
An output unit that outputs the power information predicted by the prediction unit to the host supply and demand management device;
Is provided,
In the upper supply and demand management device,
A storage unit for storing the power information output from the output unit;
An instruction unit that determines the power reduction target based on at least the power that can be reduced included in the power information, and outputs the determined power reduction target to the lower-level supply and demand management device;
Is provided ,
The management target includes a secondary battery capable of charging and discharging power,
The prediction unit of the lower-level supply and demand management device acquires information on the power capacity stored in the secondary battery,
The output unit outputs the acquired information on the power capacity to the high-order supply and demand management device,
The control unit performs control so that a predetermined capacity is charged in the secondary battery at a predetermined timing,
The instructing unit charges the predetermined capacity when the end time of the discharge is earlier than the predetermined timing when the amount of power demand is reduced by discharging from the secondary battery. When the time is later than the charging start time for the charging , the supply / demand management system is characterized in that the discharge end time is advanced or the amount of electric power to be discharged is reduced . The control unit performs control to cause the secondary battery to function as a backup power source and a peak shift power source,
The power capacity information is divided into backup power capacity information used as the backup power supply and peak shift power capacity information used as the peak shift power supply,
The instruction unit, supply management system of claim 1, wherein the determining the power reduction target based on information of power capacity for the peak shift. The management target includes a distributed power source,
The prediction unit obtains, as the demand electric energy, an electric energy obtained by excluding an electric energy prediction value supplied by the distributed power source from an electric energy prediction value requested by a load facility included in the management target. The supply and demand management system according to claim 1 or 2 .