JP2004194436A - Power purchase and generated power demand adjustment management system - Google Patents

Abstract

An object of the present invention is to be able to cope with the liberalization of power in which the power rate dynamically fluctuates from time to time and to efficiently allocate and adjust power purchase, stored power, and generated power.
A power supply system acquires and accumulates information on power fluctuating power demand and power demand that fluctuates periodically, and purchases power from a power grid based on the power filing information stored in the database and accumulates the power in a power storage power supply. Power storage allocating means 7 for allocating power, and power demand allocating processing for allocating stored power, generated power, and purchased power based on the power rate and the power generation capacity of the power generator with respect to the power demand information stored in the database. And a control means for controlling charging / discharging of the power storage power supply, power purchase from the power system, and operation of the power generation device in accordance with the allocation by the power storage allocation processing means and the power demand allocation processing means. And the power generator 4 are used together to provide cheaper power.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power purchase / generated power demand adjustment management system that includes a power storage power supply device and a power generation device that store power, allocates stored power and generated power from a power system, and adjusts power to power demand equipment. About.
[0002]
Problems to be solved by the prior art and the invention
Originally, electric power rates were unilaterally presented by electric power companies, and there was no cost-effective system for users other than the use of late-night electric power by a heat storage adjustment contract. However, with the power liberalization approaching, electric power companies have already provided, for example, 6 yen / kwh for nighttime / holiday power, 20 yen for daytime power, and 20% for peak power, as in conventional business seasonal and hourly contracts. Is being sold under a new electricity tariff system of about 28 yen.
[0003]
Further, in a conventional power supply system, for example, in Patent Document 1, by using together with a power storage system, power is stored in a power storage power supply device particularly using nighttime power, and the stored power is stored in a plurality of specific loads during daytime. , A predetermined load is selected and discharged, so that the maximum value of the power supplied from the commercial power supply can be greatly reduced with a small amount of stored power.
[0004]
The above-mentioned system aims to effectively use nighttime power and reduce the maximum value of power supplied from commercial power during the daytime. The appearance of a price menu is a matter of time, and it has become desirable to build a system that can respond to such liberalization.
[0005]
[Patent Document 1]
JP-A-2001-95180
[Means for Solving the Problems]
The present invention solves the above-mentioned problems, and can cope with the liberalization of electric power in which the electricity rate dynamically fluctuates from time to time, and can efficiently allocate and adjust the electric power to be stored after being purchased. Is to do so.
[0007]
For this purpose, the present invention includes a power storage power supply device and a power generation device that accumulate power, and purchases power from a power system, allocates the stored power and the generated power, and adjusts the power to the power demanding equipment. A management system, which acquires and accumulates information on a periodically changing power rate and power demand, and purchases power from a power system based on the information on the power rate stored in the database and stores the power in the power storage device. Power storage allocation processing means for allocating power, and power for allocating the stored power, the generated power, and the purchased power based on the power rate and the power generation capacity of the power generator with respect to the power demand information stored in the database. Demand allocation processing means, and the power storage power supply device according to the allocation by the power storage allocation processing means and the power demand allocation processing means. Discharge, power purchase from the power system, is characterized in that a control means for controlling the operation of the power device.
[0008]
Further, the information of the power rate and the power demand is stored in the database for each cycle as information that fluctuates periodically, and the storage allocation processing means includes a storage capacity of the storage power supply device. Time period allocation processing such that power is preferentially purchased and charged from the power system in order from the lowest time of the power rate in the cycle until the capacity of the power supply reaches the full capacity. It is characterized in that the storage power allocation process is performed so that the power demand is discharged in priority order from the highest time zone, the power storage device has no power corresponding to the power demand, and When the power generation cost of the power generation device is lower than the power rate, the power demand allocation process is performed with priority given to the power generation power of the power generation device, When exceeding the power generation capacity of the generator is a power around the upper ones and performing the allocation process to purchase of electricity from the power system.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining an embodiment of a power purchase / generated power demand adjustment management system according to the present invention, wherein 1 is a commercial power system, 2 is a power purchase device, 3 is a storage power device, and 4 is power generation. The device, 5 is an adjustment control device, 6 is a power rate / supply / supply information acquisition device, 7 is a power allocation calculation device, and 8 is a power demand facility.
[0010]
In FIG. 1, a commercial power supply system 1 is a power transmission and distribution system connected to a transmission line of a power company or the like that receives a 50/60 Hz commercial power supply, and a power purchase device 2 supplies power from the commercial power supply system 1 from time to time. It is a device that purchases electricity at an electricity rate. The power storage power supply device 3 is a device that includes a capacitor and other secondary batteries, stores electric power, and appropriately supplies power to a load as needed. The power generation device 4 is a device that performs so-called private power generation using heavy oil or various fuels. . The adjustment control device 5 purchases power from the commercial power system 1 through the power purchase device 2, charges / discharges the power storage power device 3, and operates the power generation device 4 to generate power. The power storage device 3 and the power generation device 4 are individually controlled. The power rate / supply / supply information acquisition device 6 obtains information on the power rate that changes from time to time via a communication line or the like, obtains supply / demand (demand / supply) information, and accumulates the information in, for example, a storage device. It is something to keep. The power allocation calculator 7 calculates an efficient power supply and demand schedule based on the power rate acquired by the power rate acquisition device 6, the unit price of power generated by the power generator 4, and supply and demand information. The power purchase device 2, the power storage device 3, and the power generation device 4 are individually controlled by the adjustment control device 5 according to the schedule. The power demanding facilities 8 are various facilities to which power is supplied and consumed from the power purchase device 2, the power storage power supply device 3, and the power generation device 4.
[0011]
The power allocation calculation device 7 basically purchases power from the power purchasing device 2 when the cost is low and stores it in the power storage power supply device 3 or supplies power to the power demanding device 8. For the demand 8, the power allocation is calculated so that power is supplied to the power demanding equipment 8 together with the power stored in the power storage power supply 3 or the power generated by the power generator 4. Allocation of power to be purchased from the power purchase device 2 based on information on the amount of power demanded by the power demand equipment 8 and the power rate for each time period stored in the database of the supply and demand information acquisition device 6 and a power storage power device The allocation of the power to be stored in the power generation device 3 and the allocation of the power generated in the power generation device 4 are calculated. For this purpose, the power rate / supply / demand information acquisition device 6 has, for example, a database, stores the power demand of the power demand facility 8 for a certain period in each cycle as periodically changing information, and also uses the Internet, telephone lines, etc. To access a power company or a specific power company through a communication line, and acquire and store information on power rates for each time zone.
[0012]
FIG. 2 is a diagram for explaining an example of an operation process performed by the power purchase / generated power demand adjustment management system according to the present invention, and FIG. 3 is a diagram for explaining an example of an allocation process from power purchase to storage (charging). FIG. 4 is a diagram for explaining an example of a demand allocation process of the power of the power storage device, the power purchase, and the power generated by the power generator.
[0013]
For example, as shown in FIG. 2, the processing by the power purchase / generated power demand adjustment management system is performed first in the next cycle (one day, one day, (Eg, weekly) power demand Pds (N) (step S11), the next cycle power rate Cp (N) is predicted (step S11), and power generation is performed based on the fuel unit price of gas and heavy oil and power generation efficiency. The power generation cost Cg per kWh by the device 4 is calculated (step S13). Further, the remaining power storage amount P_ in the storage power supply device 3 is detected, and the stored power amount Pst is replaced with the detected power storage amount P_ (step S14).
[0014]
Thereafter, for example, allocation of power purchase → storage (charging) is performed preferentially from a time zone where the predicted power rate is low (step S15). In step S16, power allocation is performed by comparing the power rate with the power generation cost of the power generation device 4 and the power demand and the power generation capacity.
[0015]
Further, when the power can be discharged from the power storage power supply 3 and recharged to the charged amount in accordance with the power demand, additional power storage allocation is adjusted (step S17), and each power purchase device 2 and power storage power supply in one cycle are adjusted. 3. A schedule for controlling the operation of the power generator 4 is created (step S18). The adjustment control device 5 controls the operation of each power purchase device 2, the power storage device 3, and the power generation device 4 so as to perform power purchase, power storage, and power supply corresponding to the power demand in each time zone according to this schedule. I do.
[0016]
In the process of allocating power purchase → storage (charging) in step S15, for example, as shown in FIG. 3, for example, first, sorting is performed from the time zone where the predicted power rate Cp (i) is low (step S21), and the power rate Cp (i). ) Are sequentially selected from the lowest time zone (step S22), and it is compared whether the power rate Cp (i) is lower than the power generation cost Cg (step S23), and the power rate Cp (i) is lower than the power generation cost Cg. In this case, it is further determined whether the storage amount Pst of the storage power supply device 3 is smaller than the maximum storage capacity Pstmax, that is, whether or not there is room for storing power (step S24).
[0017]
If the power storage amount Pst has not reached the maximum power storage capacity Pstmax, the operation flag Fb of the power purchasing device 2 in that time zone is set to “1”, and at the same time, the charging flag Fc of the power storage device 3 is set to “1”. Then, the unit charge amount P0 charged in that time zone is added to the charge amount Pst (step S25), the process returns to step S22, and the same processing is repeated. If the storage amount Pst has reached the maximum storage capacity Pstmax, the storage amount Pst of the storage power supply 3 is set to Pstmax.
[0018]
In the process of allocating the power of the power storage device 3, the power purchase, and the power generated by the power generation device 4 in step S <b> 16, for example, as shown in FIG. 4, by using the data already sorted in step S <b> 21, the power rate Cp (i) Power demand Pds (i) is selected from the high time zone (step S31), and it is determined whether or not there is the power storage amount Pst of the power storage device 3 by the value obtained by subtracting the power demand Pds (i) from the power storage amount Pst. Is positive (step S32), and when the power storage amount Pst is sufficient (in the case of YES), the discharge flag Fd of the power storage power supply device 3 is set to “1”, and in that time zone, The power demand Pds (i) to be discharged is subtracted from the charged amount Pst and replaced with a new charged amount Pst (step S33).
[0019]
If there is no power storage amount Pst sufficient to cover the power demand Pds (i) (if it is not positive in step S32), it is determined whether the power rate Cp (i) in that time zone is higher than the power generation cost Cg ( Step S34). When the power rate Cp (i) is higher than the power generation cost Cg (in the case of YES), the operation flag Fg of the power generation device 4 is set to “1” (step S35), and conversely, the power rate Cp (i) Is not higher than the power generation cost Cg (in the case of NO), the operation flag Fb of the power purchase device 2 is set to "1" (step S37).
[0020]
When the operation flag Fg of the power generator 4 is set to "1" in step S35, it is further determined whether or not the power demand Pds (i) is larger than the power generation capacity Pg (step S36), and the power demand Pds (i) is determined. ) Is larger than the power generation capacity Pg (in the case of YES), the operation flag Fb of the power purchase device 2 is further set to "1" (step S37).
[0021]
If the power demand Pds (i) is not greater than the power generation capacity Pg in the determination of step S36 (in the case of NO), after performing the processing of steps S33 and S37, the total power demand in the cycle is reduced. It is determined whether or not the process has been completed (step S38), and the process returns to step S31 and repeats the same process until the process has been completed for all power demands.
[0022]
FIG. 5 is a diagram showing an example of the fluctuation of the power rate Cp (i) and the power generation cost Cg on a one-day cycle, and FIG. 6 is an example of the fluctuation of the power demand Pds (i) and the power generation capacity Pg on a one-day cycle. FIG. 7 is a diagram illustrating an example of a charged amount Pst that fluctuates with charging and discharging of the power storage power supply device 3.
[0023]
According to the power purchase / generated power demand adjustment management system according to the present invention in the above embodiment, the power rate Cp (i) with a cycle of one day is the lowest from 3:00 to 4:00, for example, as shown in FIG. In the case where the electric power Cp (i) has a lowest value at 3:00 to 4:00 and has a highest priority, the electric power charge Cp (i) is sequentially given to the power storage power supply device 3 through the power purchase device 2 when the electric power price Cp (i) shows a fluctuation such that a peak is formed. The battery is charged until its storage capacity is full. As a result, FIG. 7 shows an example in which the charge amount Pst of the power storage device 3 becomes Pstmax by charging from 1:00 to 5:00.
[0024]
The power stored in the power storage power supply device 3 is effectively allocated to the power demand Pds (i) shown in FIG. 6, but in the example shown in FIG. 7, from 15:00 when the power rate Cp (i) reaches its peak. At 16:00 and before and after 14:00 to 17:00, the electric power stored in the electric storage power supply 3 is allocated to the electric power demand Pds (i) shown in FIG. Although the actual power demand Pds (i) is generated from 8:00, the power demand Pds (i) in a time zone in which the power of the power storage power supply device 3 is not allocated is illustrated in FIG. As described above, the power is supplied by the power from the power purchase device 2 and the power generated by the power generation device 4.
[0025]
Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, the power of the power storage power supply is preferentially provided for the power demand from the time zone where the power rate is high, but the power of the power storage power supply is not all allocated but the power generation cost is reduced. With respect to the power demand during the time period of the high power rate, in addition to the power of the power storage power supply, a part of the power or the power corresponding to the power generation capacity according to the power demand or the power generation cost may be supplied from the power generator. Good. In the prediction of power demand and power rate, a value obtained by averaging a predetermined period immediately before may be used as a predicted value, or characteristic time zones such as seasons, days of the week, and the end of the month may be extracted and averaged corresponding to each of the extracted time periods. A value or a value obtained by performing statistical processing may be used as a predicted value. Further, the present invention may be provided as one of the service menus provided by the building service system, or may be such that the system is used as a master unit and a plurality of buildings are managed as power demand facilities. . In this case, a slave unit having data collection means for measuring the power consumption of the entire building notifies the master unit installed at the center of the power amount integrated at predetermined time intervals, and the master unit measures the power amount. Has a database to store for a certain period. Further, the master unit can be realized by accessing a power company or a specific electric power company through the Internet or a telephone line, acquiring a power rate for each time zone, and storing the power rate for a certain period.
[0026]
【The invention's effect】
As is apparent from the above description, according to the present invention, the power storage device and the power generation device for storing power are provided, and the power is adjusted from the power demand equipment by purchasing the power from the power system and allocating the stored power and the generated power. A power purchase and generated power demand adjustment management system that acquires and stores information on periodically varying power rates and power demands, and purchases power from the power system based on the power rate information stored in the database. Allocation processing means for allocating power to be stored in the storage power supply device, and allocating stored power, generated power, and purchased power based on the power rate and the power generation capacity of the power generation device based on the power demand information stored in the database. Power demand allocating processing means for performing charging and discharging of the storage power supply device according to the allocation by the power storage allocating processing means and the power demand allocating processing means , Purchased power from the power system, since a control means for controlling the operation of the power device, in combination with power generator and electric power storage power supply, it is possible to provide a less expensive power.
[Brief description of the drawings]
FIG. 1 is a diagram for describing an embodiment of a power purchase / generated power demand adjustment management system according to the present invention.
FIG. 2 is a diagram for explaining an example of an operation process by the power purchase / generated power demand adjustment management system according to the present invention.
FIG. 3 is a diagram for describing an example of an allocation process from power purchase to power storage (charging).
FIG. 4 is a diagram for explaining an example of a demand allocation process of power of a storage power supply, power purchase, and power generated by a power generator.
FIG. 5 is a diagram showing an example of a fluctuation of a power rate Cp (i) and a power generation cost Cg in a cycle of one day.
FIG. 6 is a diagram showing an example of fluctuations in power demand Pds (i) and power generation capacity Pg in a cycle of one day.
FIG. 7 is a diagram illustrating an example of a charged amount Pst that fluctuates with charging and discharging of the power storage power supply device 3.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Commercial power supply system, 2 ... Power purchaser, 3 ... Power storage power supply, 4 ... Power generator, 5 ... Adjustment control device, 6 ... Electricity charge / supply and demand information acquisition device, 7 ... Electric power allocation calculator, 8 ... Electric power demand Facility

Claims (6)

A power purchase / generation power demand adjustment management system including a power storage power supply device and a power generation device that accumulate power, purchasing power from a power system, allocating the stored power and the generated power, and adjusting power to the power demand facility,
A database that acquires and accumulates information on periodically changing electricity rates and electricity demands,
Power storage allocation processing means for allocating power to be stored in the power storage device by purchasing power from a power system based on information on power rates stored in the database,
Power demand allocation processing means for allocating the stored power, the generated power, and the purchased power based on the power rate and the power generation capacity of the power generator with respect to the power demand information stored in the database,
Control means for controlling charging / discharging of the power storage power supply, power purchase from a power system, and operation of a power generator according to the allocation by the power storage allocation processing means and the power demand allocation processing means.・ Generation power demand adjustment management system. 2. The power purchase / generated power demand adjustment management system according to claim 1, wherein the information on the power rate and the power demand is stored in the database for each cycle as information that fluctuates periodically. 3. The power storage allocation processing means is configured to perform time-of-day purchase so that power is preferentially purchased from the power system and charged in order from the lowest time period of the power rate in the cycle until the storage capacity of the power storage power supply device reaches the full capacity. 2. The power purchase / generated power demand adjustment management system according to claim 1, wherein an allocation process is performed. The power demand allocating means performs the storage power allocating process so as to preferentially discharge the power demand in order from a time zone having the highest power rate in a cycle. Power purchase and generated power demand adjustment management system. The power demand allocation processing means does not have power corresponding to the power demand in the storage power supply device, and, when the power generation cost of the power generation device is lower than the power rate, preferentially the power generated by the power generation device, 2. The power purchase / generated power demand adjustment management system according to claim 1, wherein the power demand allocation processing is performed. 6. The power demand allocation processing means, when the power demand exceeds the power generation capacity of the power generation device, performs an allocation process so as to purchase the higher power from the power system. Power purchase and generated power demand adjustment management system.

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