JP4265066B2 - Multiple power system interchange control means - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an accommodation control means for achieving economical power operation by allowing power to be interchanged between systems in a contractor who individually contracts the maximum usage contract power for a plurality of power systems such as convenience stores. is there.
[0002]
[Prior art]
Currently, the electricity rate in Japan is set based on the maximum contracted power that each contractor ties with the power company and the amount of power used. The contractor is allowed to use within the range not exceeding the contracted power, and pays a power charge that is a fixed contracted power charge corresponding to the contracted power called the basic charge plus the power charge corresponding to the amount of power used. .
[0003]
The amount of power used varies depending on the time of day, day of the week, season, etc., and the time of day and season of peaking differ depending on the power system. For this reason, in a contractor who has contracted the maximum contracted power usage for multiple power grids individually, there is an imbalance in the contract power margin between grids due to a shift in the peak time zone. . In such a case, it is not legally allowed to allow contract power reserves between systems, and even if it is approved in the near future, the power specifications will be different or the timing of switching will be synchronized. Technical issues such as inability to remove. For these reasons, there have been little studies on means for finding an allowance from among a plurality of power systems and mutually economically operating economical power operations.
[0004]
This point will be explained in detail, taking a convenience store as a specific example.
Normally, convenience stores have different contracts for a plurality of power systems. For example, refrigeration distribution boards and air conditioner distribution boards are contracted with low-voltage power systems (hereinafter referred to as power systems), and lighting distribution boards are contracted with time-dependent lamp systems. Contract power used is determined.
[0005]
FIG. 5 shows an example of such a power system and a distribution board circuit name connected to the power system. Distribution board circuits connected to the power system are air conditioners, small refrigerators, refrigeration stockers, reach-in showcases, multistage showcases, ice showcases, refrigerators in counters, and showcase lighting. The distribution board circuit connected to the electric light system is sales floor lighting, counter backyard lighting, signboard / parking lot lighting, store signage power supply, heat insulation case, other lamps and outlets.
[0006]
FIG. 6 shows the transition of power consumption with respect to four distribution boards connected to the lamp system in one day in the summer of such a convenience store. In the figure, (1), (2), (3), and (4) respectively indicate sales floor lighting, counter / backyard lighting, signboard / parking lot lighting, and storefront lighting.
[0007]
As is clear from the figure, the sales floor lighting in (1) and counter / backyard lighting in (2) have remained at a constant power consumption for 24 hours. ) Store signage lighting consumes electricity only at night. The total power consumption of (1) and (2) is about 3 kW, and the total nighttime power consumption of the specific distribution boards (3) and (4) is about 3 kW. Therefore, the contract power of the electric power system must be larger than the sum of these values of 6 kW, and there is a margin of contract power of about 3 kW or more in the daytime.
[0008]
FIG. 7 shows the transition of power consumption of the air conditioner distribution board connected to the power panel on the same day. The outside air temperature dropped to 23 ° C at night and rose to 32 ° C during the day. Correspondingly, the cooling input of the air conditioner also dropped to 2 kW at night and rose to 7 kW in the daytime. Therefore, the contract power of the power system must be larger than 7 kW, and there is a margin of contract power of about 5 kW or more at night.
[0009]
As can be seen by comparing these two figures, the time zone in which the contract power can be afforded is substantially in opposite phase, and if the power can be accommodated, the contract power as a whole can be reduced. However, as mentioned above, there is no legal approval for this point, and even if it is approved, the power system is three-phase 200V, while the lamp system has different power specifications from single-phase 200V. However, there are still problems such as the timing at which each switch does not completely match. For this reason, the contractors individually contracted a high maximum use contract electric power to operate uneconomically.
[0010]
[Problems to be solved by the invention]
The present invention pays attention to the fact that the maximum value of the contract power for each power system (power and light) is set excessively and that the running cost of power and light is different. However, when there is a margin of power in the same system, the power is supplied to a specific distribution board in another system to reduce contract power and running costs.
[0011]
[Means for Solving the Problems]
Equipped with multiple power systems that have contracted the maximum usage contract power individually, multiple distribution board circuits connected to each of the power systems, and an interchange means for accommodating power between the power systems, and power load is concentrated by time zone The specific power system is configured so as to be provided with control means for accommodating power from other power systems having a power margin as appropriate.
[0012]
The power system with the lowest unit price is identified from the multiple power systems that have power margins, and power from other power systems that are cheaper for the specific power system where the power load is concentrated can be accommodated. It is comprised so that the control means to perform may be provided.
[0013]
Converts the output of each power system to a substantially DC voltage, supplies it to the load via the inverter circuit, stores power in a time zone where the unit price is low and the power unit is cheap, and the specific time of the specific power system where the power load is concentrated For the belt, a system that discriminates the system with the lowest unit price from the stored power and a plurality of power systems with power margins, and provides a control means for accommodating power from the cheapest system to the specific power system. It is configured.
[0014]
An air conditioner that has two heat source units, a low-voltage power system and city gas, which is configured to determine the system with the lowest unit price in that time zone and to provide a control means that uses the heat source unit of this system It is.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the near future, it is considered that it will be approved to allow for a margin to be accommodated among multiple power systems, such as being authorized to sell surplus power in photovoltaic power generation houses to power companies. Here, based on this perspective, embodiments of the present invention will be described with reference to the drawings.
[0016]
Embodiment 1
FIG. 1 is a block diagram showing a case where the interchange control means for a plurality of power systems according to Embodiment 1 of the present invention is applied to a power distribution board circuit for each power system of a convenience store.
In the figure, 1 is an interchange control means, 2 is a power system use power detection means, and 3 is a power system use power detection means. The power system usage power detection means 2 and the lamp system power usage detection means 3 constantly detect power usage in each system, and these signals are transmitted to the accommodation control means 1.
[0017]
Next, the operation will be described.
As described above, in the summer, the outside air temperature decreases as time passes from day to night, and the power consumption of the air conditioner of the power system suddenly decreases. The interchange control means 1 determines the down timing based on the signal sent from the used power detection means 2. Based on this timing, the accommodation control means 1 creates a single-phase 200 V from the margin of the 3-phase 200 V contract power generated in the power system. This output is connected to the distribution board of the lighting signage and the signboard / parking lot lighting, and is supplied to each.
[0018]
Here, as described in the conventional example, the surplus power of the power system is about 5 kW or more, and the combined power consumption of the store signboard illumination and the signboard / parking lot illumination is about 3 kW. Therefore, it is possible to include the electric power of the store signage lighting and the signboard / parking lot lighting in the margin of the power system. In other words, if the timing is captured and the power system power is converted to the power system power, the contract power of the power system is left as it is, and the contract power for the store signage lighting and the signboard / parking lot lighting of the light system is completely powered. It can be switched to the system. This makes it possible to operate economically to reduce the contract power of the light system.
[0019]
Embodiment 2
FIG. 2 is a functional block diagram showing components of the accommodation control means according to the second embodiment of the present invention. In the figure, 4 and 5 are used power detection means in systems 1 and 2, 6 is contract power storage means for each system, 7 is margin power calculation means, 8 is a metered charge storage means, 9 is an outdoor lighting lighting permission application storage means, Reference numeral 10 denotes power interchange determining means, 11 denotes power system switching means, and 12 denotes power conversion means.
[0020]
Next, the operation will be described.
The used power in the power systems 1 and 2 is detected by the used power detection means 4 and 5. These detection signals are input to the marginal power calculation means 7 and the marginal power system and marginal power are calculated while referring to the information from the system-specific contract power storage means 6. This calculation result is input to the power interchange determining means 10, and the power system that minimizes the power charge at this time is selected while referring to the information from the metered charge storage means 8 and the outdoor lighting lighting permission application storage means 9.
[0021]
Here, the surplus power from the selected power system is distributed to each system by the power system switching means 11. At this time, since the power specifications of the different systems are different, the power conversion means 12 converts the power specifications into a suitable power specification.
[0022]
In this way, this embodiment pays attention to the fact that there is a specific power system with different power charges depending on the time zone, and selects the most suitable power system for that time zone in terms of charges, taking into account the surplus power and the unit price of charges. By doing so, it aims to achieve economical power operation.
[0023]
This point will be described in detail by taking the convenience store described above as an example. As shown in Fig. 6, the price of the electric light contract for hourly electric lights is 32.25 yen / kWh in the time zone from 7:00 am to 23:00 pm corresponding to the daytime. In the time zone from 23:00 to 7:00 in the morning, the pay-as-you-go fee is 6.15 yen / kWh.
[0024]
Therefore, outdoor billboard lighting and signboard / parking lot lighting for outdoor lighting can be used at a low metered rate in the time zone from 23:00 to 6:00. However, in the time zone from 17:00 in the evening to 23:00 in the evening, a high charge of 32.25 yen / kWh must be used, and the lamp charge is expensive.
[0025]
On the other hand, the summer usage fee of the power system is always 11.55 yen / kWh for 24 hours as shown in FIG. This unit price is lower than the daytime electric charge (32.25 yen / kWh), but higher than the nighttime electric charge (6.15 yen / kWh).
[0026]
Therefore, in the time zone from 17:00 to 23:00, it turns out that it is economical if the power distribution system is turned on to the two distribution boards for outdoor lighting. At this time, the monthly reduction of the pay-as-you-go fee is
4 hours / day x (32.25 yen / kWh-11.55 yen / kWh) x 3 kW x 30 days / month = 7000 yen / month Formula (1)
Therefore, an economic effect of 84,000 yen is expected annually.
[0027]
It can be seen that economical power operation can be achieved by determining the power system with the least power charge in this way and conducting power interchange to the specific power system where the load is concentrated.
[0028]
In addition, although it demonstrated in two figures by two systems, it is the same even if it is a number beyond this. In addition, converting a three-phase 200V power system into a single-phase 200V electric power system can be easily performed by selecting two appropriate wires from the three-phase 200V three wires using switching means.
[0029]
Embodiment 3
While the first and second embodiments are based on the assumption that contract power is interchanged between a plurality of power systems, the third embodiment shows an application example close to the current method.
FIG. 3 is a functional block diagram showing a configuration according to the third embodiment of the present invention.
[0030]
In the figure, 20 is a three-phase 200V power source for the power system, 21 is a single-phase 200V power source for the lamp system, 22 and 23 are switch circuits, 24 is a rectifier circuit for converting the three-phase 200V power source into a DC voltage, 25 is an inverter circuit, 26 is a load air conditioner, 27 is a charge / discharge circuit, 28 is a storage battery, 29 is a switch circuit, 30 is an electrical device, 31 is a rectifier circuit, 32 is an inverter circuit, and 33 is a load illuminator. is there.
[0031]
Next, the operation will be described.
First, the normal operation will be described. The switch circuit 22 and the switch circuit 23 are in an OFF state, and the voltage from the three-phase 200 V power source 20 is converted into a substantially DC voltage by the rectifier circuit 24. This substantially DC voltage is input to the inverter circuit 25 and drives the air conditioner 26 as a load. At this time, a part of the electric power is stored in the storage battery 28 by the charge / discharge circuit 27.
[0032]
At this time, the switch circuit 29 is in an ON state, and the voltage from the single-phase 200 V power source 21 of the lamp system is directly input to the electric device 30 of the load to drive it, and the rectifier circuit via the switch circuit 29 After being input to 31 and converted into a substantially DC voltage, it is input to the inverter circuit 32 to drive the load illuminator 33.
[0033]
Next, a description will be given of a case where there is a margin in the three-phase 200V power source 20 of the power system and this can be accommodated in the lamp system.
The switch circuit 29 is turned off, and the illuminator 33 is disconnected from the single phase 200V. At this time, the switch circuit 22 and the switch circuit 23 are simultaneously turned on, and the substantially DC voltage obtained by rectifying the three-phase 200V is input to the inverter circuit 32 and drives the illuminator 33.
[0034]
Here, the electric power stored in the above-described storage battery 28 is discharged by the charge / discharge circuit 27 in a time zone where the electric power system has a high unit price, for example, and is used for economical power operation. In this way, once the three-phase 200V and single-phase 200V are converted to approximately DC voltage, power interchange between systems is simplified, and power is stored using a time zone where the power unit price is low. Because it is possible to cover high time periods with cheap power, more economical operation is possible.
[0035]
Embodiment 4
Embodiment 4 of the present invention shows a case where the power of the power system and city gas are used in combination. Compared with Embodiment 2, the system to be operated is not limited to electric power, but has been expanded to include city gas. In other words, the purpose is to select the system with the lowest unit price in the time zone from the power system and city gas, and to achieve economical operation.
[0036]
FIG. 4 is a block diagram of components in the fourth embodiment. In the figure, based on the signal from the control circuit 40, the shunt 41 selects either the electric heat source 42 by the three-phase 200V power source of the power system or the gas heat source 43 by the city gas, thereby operating the air conditioner economically. Is done.
[0037]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0038]
In one contractor who contracts the maximum usage contract power individually with a plurality of power systems, an interchange means for accommodating power between the power systems is provided, and for the specific power system where the power load is concentrated depending on the time zone, Since it is configured to accommodate power from other power systems with sufficient power margin, the total contract power can be reduced.
[0039]
In addition, the power system with the lowest unit price is determined from among a plurality of power systems with sufficient power margin, and the power from this power system is accommodated to the specific power system where the power load is concentrated. Since it comprised so, a total contract electric power can be reduced and a running cost can be reduced.
[0040]
In addition, the output of each power system is converted to a substantially DC voltage and supplied to the load, and the power is stored in a time zone where the power unit price is low and the unit price is low. Since the system with the lowest unit price is identified from the stored power and multiple power systems that have power margins, the total contracted power And the running cost can be reduced.
[0041]
In addition, in air conditioning equipment that has two heat source units, a low-voltage power system and city gas, the system with the lowest unit price in the time zone was identified and the heat source unit of that system was used, so the running cost Can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration in a case where an accommodation control unit according to Embodiment 1 of the present invention is applied to a convenience store power system.
FIG. 2 is a functional block diagram showing a configuration of accommodation control means according to Embodiment 2 of the present invention.
FIG. 3 is a block diagram showing a configuration when the accommodation control means according to the third embodiment of the present invention is applied to a power system of a convenience store.
FIG. 4 is a block diagram of components according to Embodiment 4 of the present invention.
FIG. 5 is a block diagram showing power types and distribution board circuit names in a conventional convenience store.
FIG. 6 is a diagram showing a transition of power consumption of each distribution board and a price of a lamp contract of lamps according to time of day in a lamp system of a day in summer in a conventional convenience store.
FIG. 7 is a diagram showing a transition of power consumption of each distribution board and a summer usage fee in a daily power system in a summer at a conventional convenience store.
[Explanation of symbols]
1 interchange control means, 2 power system use power detection means, 3 power system use power detection means, 4 system 1 use power detection means, 5 system 2 use power detection means, 6 system-specific contract power storage means, 7 Surplus power calculation means, 8 Pay-per-charge storage means, 9 Outdoor lighting lighting permission application storage means, 10 Power interchange determination means, 11 Power system switching means, 12 Power conversion means, 20 3-phase 200V power supply, 21 Single-phase 200V power supply , 22 switch circuit, 23 switch circuit, 24 rectifier circuit, 25 inverter circuit, 26 air conditioner, 27 charge / discharge circuit, 28 storage battery, 29 switch circuit, 30 electrical equipment, 31 rectifier circuit, 32 inverter circuit, 33 illuminator, 40 Control circuit, 41 shunt machine, 42 electric heat source machine, 43 gas heat source machine

Claims (2)

A plurality of power systems with contracted power contracts for use individually, an interchange means connected to the plurality of power systems for accommodating power between the power systems, and detecting the power of the plurality of power systems and calculating margin power And determining means for determining the accommodation power based on the information from the charge storage means for storing the electricity charge according to the time zone and the season, and based on the determination of the determination means, the accommodation power is added to the outdoor lighting power. Control means characterized by being used. 2. The control means according to claim 1, wherein the determination means makes a determination based on information on an application for permission to turn on outdoor lighting.

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