JP2007202277A - Maximum demanded electric power control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a maximum demanded electric power control system that can automatically change a set point of a demand controller. <P>SOLUTION: This maximum demanded electric power control system 1 is provided with a switch 11 connected to a wiring not shown in a figure, a group of school-side facilities 21 and a group of air conditioners 22, which are connected to down stream than the switch 11 and main apparatus to which electric power is supplied, a total electric power integration device 14 that stores maximum demanded electric power of the group of the school-side facilities 21 and the group of the air conditioners 22, a school-side electric power integration device 15 that stores the school-side maximum demanded electric power of the group of the school-side facilities 21, the demand controller 16 that judges whether or not the electric power used in the group of the air conditioners 22 has proper capacity, and a demand controller controlling device 17 that outputs the set point of the demand controller 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a maximum demand power control system that monitors and controls electric power used in a load facility.

Conventionally, the electricity charge paid to the power company by the user who uses the power is given by the sum of the metered charge determined by the amount of power actually used by the user and the basic charge determined by the contract method. . Of these, the metered rate is determined by multiplying the used electric energy by the unit price per unit electric energy. Also, the basic charge is the following formula:
Basic charge [yen] = Contract power [kW] x Basic charge unit price [yen / kW] x Power factor,
Given in. Of these, the power factor is
Power factor = (185−power factor) / 100,
Given in. The power factor is a ratio of active power to used power. In addition, several methods are known as methods for determining contract power, but in recent years, contract power is often determined by an actual value contract method (actual amount system).

With reference to FIG. 6 and FIG. 7, a method for determining contract power by the actual value contract method will be described.
FIG. 6 is a graph showing the maximum demand power measured every month and the contract power determined by the maximum demand power.
FIG. 7 is a graph showing the concept of average demand power.

  The maximum demand power indicates the largest average demand power in one month among the average demand power calculated by averaging the amount of power used during a predetermined unit time (30 minutes). As shown in FIG. 7, this average demand power is obtained by integrating the amount of power obtained by integrating power (demand power) that changes every moment depending on the power usage state over a predetermined unit time from a predetermined time. Given in terms of time. That is, the average demand power shown in FIGS. 7A to 7D is all equal.

  In the actual value contract method, the largest maximum demand power for the past 11 months including the current month is determined as the contract power among the maximum demand power for each month measured as described above. Specifically, as shown in FIG. 6, for example, the contract power in June of Heisei b was measured in the largest maximum demand power for the past 11 months including the current month, that is, August of Heisei a It is determined to the maximum power demand. For example, the contract power in August of Heisei b is determined to be the maximum demand power measured in January of Heisei b.

  As described above, under the actual value contract method, the contract power is determined by the maximum demand power measured in the past regardless of the power usage state of the month. Therefore, in order to keep the basic charge low, it is preferable to operate the load equipment so as to suppress the maximum demand power. More specifically, since the average demand power greatly depends on the peak value of the power used, it is preferable to operate the load facility without updating the peak value.

  Under such circumstances, one or more load facilities, a power suppression time setting means and a power reduction rate setting means are provided, and by setting the power suppression time setting means and the power reduction rate setting means, A power suppression control device that changes and controls the capability, and the power suppression control device has a capability obtained by multiplying a set power reduction rate by a rated capability of the load facility during a set power suppression time. A demand controller that operates equipment is disclosed (for example, see Patent Document 1).

According to this demand controller, it is possible to clarify the power reduction time and the amount of power reduction before and after the execution of the power reduction based on the values set in advance by the power supplier and the user, thereby reducing the power consumption. This can be executed reliably, and the degradation of the load facility performance caused by this reduction in power consumption can be minimized.
Japanese Patent Laid-Open No. 9-266630

  However, in the above-described demand controller, the setting of the value that determines the reduction in power consumption is not automatically performed, and the power supplier and the user can select, for example, a demand setting value according to the usage environment of the demand controller. It was necessary to set it manually when using beyond.

  As described above, manually setting the demand controller is a very complicated operation in an environment in which the setting value needs to be changed frequently. In addition, if the setting value of the demand controller is determined based on the judgment of a user such as a user, it is difficult to say that the setting according to the usage environment is always performed properly, and there is a risk that a setting error will occur. There is also.

  The present invention is a maximum demand power control capable of automatically changing a setting value of a demand controller that monitors the maximum demand power of power used in a partial load equipment group among a plurality of load equipment groups constituting the whole. The purpose is to provide a system.

  (1) A switch connected to the distribution line, a first load facility group and a second load facility group connected by branching at a branching portion connected downstream from the switch, the switch and the branch An overall power measuring means for measuring the overall power used in the first load equipment group and the second load equipment group, connected to the power transformer via an instrument transformer, the branch section and the second A first power measuring means for measuring the first power used in the first load equipment group, connected to the one load equipment group via an instrument transformer, and used in the second load equipment group Second power measuring means for measuring the second power to be calculated, overall maximum demand power calculating means for calculating the overall maximum demand power based on the overall power measured by the overall power measuring means, and the calculated overall maximum An overall maximum demand power storage means for storing demand power; First maximum demand power calculating means for calculating the first maximum demand power based on the first power measured by the one power measuring means, and first maximum demand power storage means for storing the calculated first maximum demand power And a demand controller that determines whether or not the second power is an appropriate magnitude based on the measured second power and the input set value, and outputs a warning signal based on the determination And a demand controller control device that determines the setting value based on the stored overall maximum demand power and the stored first maximum demand power, and outputs the determined setting value to the demand controller. Maximum demand power control system characterized by that.

  According to invention of (1), the electric power used by the 1st load equipment group and the 2nd load equipment group is supplied from a distribution line via a switch and a branch part, respectively. Among these, the total power used in the first load equipment group and the second load equipment group is measured by the total demand power measuring means, and the first power used in the first load equipment group is measured by the first power measuring means. The second power used in the second load facility group is measured by the second power measuring means. The total maximum demand power calculating means calculates the total maximum demand power of the power used in the first load facility group and the second load facility group based on the measured total power. The total maximum demand power storage means stores the calculated total maximum demand power as a past total maximum demand power performance. The first maximum demand power calculation means calculates the first maximum demand power of the power used in the first load facility group based on the measured first power. The first maximum demand power storage means stores the calculated first maximum demand power as a past record of the first maximum demand power.

  Here, since the demand controller control apparatus which determines the setting value of the demand controller based on the stored total maximum demand power and the first maximum demand power is provided, the setting value of the demand controller is the first and second loads. It is determined by the past results of the maximum demand power of the equipment group and the maximum demand power of the first load equipment group. More specifically, by providing a demand controller control device, the contract power for the current month and the first maximum demand power for the day are predicted in advance based on the past total maximum demand power and the first maximum demand power. Is done. Therefore, the setting value of the demand controller is automatically set within a range that does not exceed the contract power and within a range that does not hinder the use of the power of the second load facility as much as possible.

  (2) In the maximum demand power control system according to (1), the overall maximum demand power storage means and the first maximum demand power storage means are the past overall maximum demand power and the first for at least 12 months, respectively. Maximum demand power control system characterized by continuously storing maximum demand power.

  According to the invention of (2), the overall maximum demand power storage means and the first maximum demand power storage means respectively store the overall maximum demand power and the first maximum demand power for at least 12 months as past results. Therefore, the demand controller control device can determine the setting value of the demand controller in accordance with the actual power usage status based on the past actual results of the total maximum demand power and the first maximum demand power in the previous year.

  (3) In the maximum demand power control system according to (1) or (2), the overall maximum demand power storage means stores the overall maximum demand power for every predetermined time, and the first maximum demand power storage means A maximum demand power control system for storing the first maximum demand power for each predetermined time.

  According to the invention of (3), the overall maximum demand power storage means and the first maximum demand power storage means store the overall maximum demand power and the first maximum demand power for each predetermined time, respectively. Since the electric power used in the load facility may vary greatly depending on time, for example, by storing every day and every 30 minutes, the results of the overall maximum demand power and the first maximum demand power can be stored more accurately. it can. Therefore, the demand controller control device can determine the setting value of the demand controller more accurately based on the total maximum demand power and the first maximum demand power stored in this manner every day and every 30 minutes.

  (4) In the maximum demand power control system according to any one of (1) to (3), environmental information in a place where the first load facility group or the second load facility group is installed is used as the overall maximum demand. It further comprises an environment information input means for automatically inputting power into the power calculation means or the first maximum demand power calculation means, and the overall maximum demand power storage means or the first maximum demand power storage means is provided by the environment information input means. The input environment information is stored, and the demand controller control device, based on the stored overall maximum demand power, the stored first maximum demand power, and the stored environment information, A maximum demand power control system, wherein a set value is determined and the determined set value is output to the demand controller.

  According to the invention of (4), the overall maximum demand power storage means or the first maximum demand power storage means automatically stores environmental information such as temperature, humidity, and weather at the place where the load facility group is installed. To do. Further, the demand controller control device can determine the setting value of the demand controller based on the stored environment information in addition to the stored overall maximum demand power and the first maximum demand power.

  Since the electric power used in the first load facility group and the second load facility group greatly depends on the environment such as the temperature, humidity, and weather in the place where the load facility group is installed, the environmental information is thus obtained. By determining the setting value of the demand controller based on the above, it is possible to determine the setting value of the demand controller in accordance with the actual power usage situation.

  (5) In the maximum demand power control system according to any one of (1) to (4), the demand controller control device is configured to provide a basis for the set value in accordance with a load facility that constitutes the second load facility group. Basic set value input means for inputting a set value is provided, and the set value is based on the input basic set value, the stored overall maximum demand power and the stored first maximum demand power A maximum demand power control system characterized by determining.

  According to the invention of (5), since the basic set value input means for inputting the basic set value of the set value of the demand controller is provided, the second power used in the second load equipment group is based on the basic set value. It will not be suppressed small. Therefore, the user can ensure the second power at a minimum.

  (6) In the maximum demand power control system according to any one of (1) to (5), the first load facility group and the second load facility group are configured by load facilities in a school, and the second load The equipment group is composed of a plurality of air-conditioning equipment additionally installed in the school.

  According to the invention of (6), even if the second load facility group is an air conditioning facility additionally installed in a school, the maximum demand power is obtained without suppressing the power used in the air conditioning facility more than necessary. Air conditioning can be used within this range, and the school's basic electricity bill can be kept low.

  Specifically, in recent years, an increasing number of schools have newly installed air conditioners such as coolers in addition to the existing school facilities such as electric lights. In this case, the payer may be different from the electricity charge for using school equipment and the electricity charge for using air conditioning equipment. However, since the basic charges generated by the use of these school facilities and air conditioning facilities are determined by the overall maximum power demand, in order to keep the basic charges low and use these facilities efficiently, It is necessary to manage the power consumption with the air conditioning equipment in cooperation.

  (7) In the maximum demand power control system according to (6), the overall maximum demand power storage unit and the first maximum demand power storage unit respectively store the overall maximum demand power and the first maximum demand power. The maximum power demand control system, wherein the system is stored by classifying into school holidays and weekdays.

  According to the invention of (7), the overall maximum demand power and the first maximum demand power are the school holidays where the load facility group is installed in the overall maximum demand power storage means and the first maximum demand power storage means, respectively. The demand controller control device determines the setting value of the demand controller based on the total maximum demand power and the first maximum demand power stored by classifying on holiday and weekday. it can. Since the power used in the load facility group varies greatly depending on whether it is a holiday or a weekday, the setting value of the demand controller can be determined in accordance with a more actual power usage situation.

  (8) In the maximum demand power control system according to any one of (1) to (7), the demand controller includes warning sound output means for generating a warning sound based on the output of the warning signal. And maximum demand power control system.

  According to the invention of (8), since the warning sound output means for generating the warning sound is provided, when the demand controller determines that the second power used in the second load facility group is not appropriate, a warning is given. The sound output means can generate a warning sound. The user can recognize that the second power used in the second load equipment group is not appropriate by listening to the sound of the warning sound, and thus can quickly adjust the second power.

  (9) In the maximum demand power control system according to any one of (1) to (8), the demand controller is controlled to suppress the magnitude of the second power based on the output of the warning signal. A maximum demand power control system, further comprising a power suppression control means for performing the control.

  According to the invention of (9), since the power suppression control means for controlling to suppress the second power is provided, the demand controller determines that the second power used in the second load facility group is not appropriate. In this case, the second power can be controlled to be suppressed. Therefore, the second power can be within an appropriate range.

  According to the present invention, since the demand controller control device for determining the setting value of the demand controller based on the stored total maximum demand power and the first maximum demand power is provided, the setting value of the demand controller is set to the first, It is determined based on past results of the maximum demand power of the second load equipment group and the maximum demand power of the first load equipment group. More specifically, by providing a demand controller control device, the contract power for the current month and the first maximum demand power for the day are predicted in advance based on the past total maximum demand power and the first maximum demand power. Is done. Therefore, the setting value of the demand controller is automatically set within a range that does not exceed the contract power and within a range that does not hinder the use of the power of the second load facility as much as possible.

<Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the overall configuration of a maximum demand power control system 1 according to the present invention. As shown in FIG. 1, the maximum demand power control system 1 is a switch 11 connected to a distribution line (not shown) and a first target that is connected downstream from the switch 11 and is supplied with power. The school-side equipment group 21 as the load equipment group and the air-conditioning equipment group 22 as the second load equipment group, the overall power accumulation device 14 for storing the maximum demand power of the school-side equipment group 21 and the air-conditioning equipment group 22, and the school side The school-side power accumulator 15 that stores the maximum demand power of the equipment group 21, the demand controller 16 that determines whether or not the power used in the air conditioning equipment group 22 is appropriate, and the demand controller 16 And a demand controller control device 17 for outputting the set value.

  The switch 11 is a switch that opens and closes the electrical circuit from the distribution line to an electrical circuit that is distributed to the load facilities that constitute the school-side equipment group 21 and the air-conditioning equipment group 22.

  The school-side equipment group 21 and the air-conditioning equipment group 22 are configured by load equipment in the school. Among these, the school side equipment group 21 is comprised by several load equipments, such as an electric lamp installed in this school. The air conditioning equipment group 22 is composed of a plurality of air conditioning equipment additionally installed at this school. Moreover, the rated power of the several air conditioning equipment which comprises this air conditioning equipment group 22 shall be known beforehand.

  The school-side equipment group 21 and the air-conditioning equipment group 22 are branched and connected at a branching portion 19 connected downstream from the switch 11.

  An instrument transformer 12 is connected between the electrical path connecting the branch portion 19 and the switch 11. The meter transformer 12 is connected to a total power meter 33 as a total power measuring means. The total power meter 33 measures the total power used in the load facility group connected downstream from the instrument transformer 12. That is, it is supplied via an electric circuit connecting the branching unit 19 and the switch 11, and the total electric power that is electric power used by the school side equipment group 21 and the air conditioning equipment group 22 is measured. The total power measured by the total power meter 33 in this way is output to the total power integration device 14.

  An instrument transformer 13 is connected between the electrical lines connecting the school-side equipment group 21 and the branching section 19. The school transformer 13 is connected to the instrument transformer 13 as a first power measuring means. The school-side power meter 31 measures the school-side power as the first power used in the load facility group connected downstream from the instrument transformer 13. That is, the school-side power that is supplied through the electrical path connecting the school-side equipment group 21 and the branching portion 19 and is used in the school-side equipment group 21 is measured. The school-side power measured by the school-side power meter 31 in this way is output to the school-side power accumulation device 15.

  The air conditioning equipment group 22 is connected with an air conditioning wattmeter 32 as second power measuring means. The air conditioning power meter 32 measures the air conditioning power as the second power that is the power used in the air conditioning equipment group 22. The air conditioning power measured by the air conditioning wattmeter 32 in this way is output to the demand controller 16.

  The total power integration apparatus 14 includes a total maximum demand power calculation unit 141 as a total maximum demand power calculation unit that calculates the total maximum demand power based on the total power measured by the total power meter 33, and the calculated total maximum power. An overall power storage unit 142 as an overall maximum demand power storage unit that stores the demand power.

  The total maximum demand power calculation unit 141 is connected to the total power meter 33. The total maximum demand power calculation unit 141 receives the total power output from the total power meter 33, calculates the total maximum demand power for each predetermined time based on the input total power, The total maximum demand power is output to the total power storage unit 142.

  Further, as will be described in detail later with reference to FIG. 2, in order to calculate the overall maximum demand power for every predetermined time, the overall maximum demand power calculation unit 141 has an auxiliary storage area (for example, a RAM). Is provided. In the present embodiment, the overall maximum demand power calculation unit 141 is described as calculating the overall maximum demand power for every day and every 30 minutes as the overall maximum demand power for each predetermined time. However, the present invention is not limited to this. is not.

  In addition, the total maximum demand power calculation unit 141 includes a timer for measuring the date and time, and the date measured by the timer is a holiday of a school in which the school side equipment group 21 and the air conditioning equipment group 22 are installed, or a weekday. And means for classifying (not shown).

  The total power storage unit 142 stores the input overall maximum demand power for every day and every 30 minutes by classifying it as either a school holiday or a weekday in which the school side equipment group 21 and the air conditioning equipment group 22 are installed. To do. The stored daily maximum and every 30 minutes of total maximum power demand will continue to be stored over the past 10 years. The overall maximum demand power stored in this manner is read by a set value determination unit 171 described later provided in the demand controller control device 17.

  The school-side power accumulation device 15 includes a school-side maximum demand power calculation unit 151 as a first maximum demand power calculation unit that calculates school-side maximum demand power based on school-side power measured by the school-side power meter 31; A school-side power storage unit 152 as a first maximum demand power storage unit that stores the calculated school-side maximum demand power, and an environment information input unit 153 as an environment information input unit that automatically inputs temperature. Prepare.

  The school-side maximum demand power calculation unit 151 is connected to the school-side power meter 31. The school-side maximum demand power calculation unit 151 receives the school-side power output from the school-side power meter 31, calculates the school-side maximum demand power for each predetermined time based on the input school-side power, The overall maximum demand power for each predetermined time is output to the school-side power storage unit 152.

  Further, as will be described in detail later with reference to FIG. 3, in order to calculate the school-side maximum demand power for each predetermined time, the school-side maximum demand power calculation unit 151 includes an auxiliary storage area (for example, a RAM). ) Is provided. The school-side maximum demand power calculation unit 151 includes a timer for measuring date and time (not shown). In the present embodiment, the school-side maximum demand power calculation unit 151 is described as calculating the school-side maximum demand power for every day and every 30 minutes as the school-side maximum demand power for each predetermined time. It is not limited to.

  The school-side power storage unit 152 classifies the inputted daily maximum demand power for each day and every 30 minutes as either a school holiday or a weekday where the school-side equipment group 21 and the air-conditioning equipment group 22 are installed. And remember. The stored daily maximum demand power for each day and every 30 minutes is stored for the past 10 years. The school-side power storage unit 152 also stores environment information such as the temperature input from the environment information input unit 153 described later. The school-side maximum demand power stored in this way is read by a set value determination unit 171 described later provided in the demand controller control device 17.

  The environment information input unit 153 is a means for inputting the environment information at the place where the school side equipment group 21 is installed into the school side power storage unit 152. The environment information input by the environment information input unit 153 is, for example, the temperature, but is not limited thereto, and any information may be used as long as the information is related to the environment in which the school side equipment group 21 is installed.

  The demand controller control device 17 has a setting value determination unit 171 as setting value determination means for determining the setting value of the demand controller 16 and basic setting value input as basic setting value input means for inputting the basic setting value of the demand controller 16. Part 172.

  This basic setting value is a basic setting value for the setting value of the demand controller 16. By providing such a basic set value, the air conditioning power used in the air conditioning equipment group 22 can be secured at a minimum. Therefore, comfortable use of the air conditioning equipment group 22 is not prevented by appropriately inputting the basic set values. The demand controller control device 17 includes a timer (not shown) that measures the date and time.

  The set value determination unit 171 is based on the overall maximum demand power and environment information stored in the overall power storage unit 142 and the school side maximum demand power stored in the school side power storage unit 152 every day and on the current day. Every 30 minutes, the setting value of the demand controller 16 is determined, and the determined setting value is output to the demand controller 16.

  The set value determination unit 171 determines a set value based on the basic set value in addition to the overall maximum demand power, the school-side maximum demand power, and the environment information.

  The basic set value input unit 172 inputs the basic set value of the air conditioning power used in the air conditioning equipment group 22 to the set value determination unit 171 in accordance with the rated power of the air conditioning equipment constituting the air conditioning equipment group 22.

  The demand controller 16 determines whether the air conditioning power used in the air conditioning equipment group 22 has an appropriate magnitude, and outputs a warning signal based on this determination, and the warning signal A warning sound output unit 162 as a warning sound output unit that generates a warning sound based on the output of the power, and a power suppression control unit as a power suppression control unit that controls the air conditioning power used in the air conditioning equipment group 22 163.

  Based on the air conditioning power input from the air conditioning wattmeter 32 and the set value input from the demand controller control device 17, the power control determination unit 161 has an appropriate amount of air conditioning power used in the air conditioning equipment group 22. The warning signal is output to the warning sound output unit 162 and the power suppression control unit 163 based on this determination. Specifically, as will be described later with reference to FIG. 5, the demand controller 16 outputs a warning signal to the warning sound output unit 162 and the power suppression control only when it is determined that the air conditioning power has an appropriate magnitude. To the unit 163. In addition, the power control determination unit 161 includes a timer (not shown) that measures the date and time.

  The warning sound output unit 162 generates a warning sound when a warning signal is input from the power control determination unit 161. Thus, by sounding the warning sound based on the output of the warning signal, it is possible to notify the manager who manages the air conditioning power that the air conditioning power is not at an appropriate level.

  The power suppression control unit 163 is connected to the air conditioning equipment group 22. The power suppression control unit 163 controls the air conditioning equipment group 22 so as to suppress the air conditioning power used in the air conditioning equipment group 22 when a warning signal is input from the power control determination unit 161.

  The sound generation of the warning sound by the warning sound output unit 162 and the control of the air conditioning power of the air conditioning equipment group 22 by the power suppression control unit 163 are continued while the warning signal is output from the power control determination unit 161. Shall.

  Here, the overall maximum demand power calculation unit 141 and the overall power storage unit 142 of the overall power integration device 14, the school side maximum demand power calculation unit 151 and the school side power storage unit 152 of the school side power integration device 15, and a demand controller The set value determination unit 171 of the control device 17 and the power control determination unit 161 of the demand controller 16 use, for example, a microcomputer including a CPU, a ROM, and a RAM, and operate according to a program stored in advance in the ROM or the like. Realized as a functional element.

  The control operation of the maximum demand power control system 1 will be described with reference to Tables 1 and 2 in addition to FIGS.

  Tables 1 and 2 are tables showing an example of the operation of the maximum demand power control system 1, and each month contract power [kW], overall maximum demand power [kW], school side maximum demand power [kW], air conditioning maximum This is an example showing the demand power [kW] and the set value [kW]. In Tables 1 and 2, the values described in the columns of overall maximum demand power [kW] and school-side maximum demand power [kW] are the maximum demand power for each month, and the air conditioning maximum demand power [kW] ] Is a value obtained by subtracting the school-side maximum power demand from the total maximum power demand for each month. The value described in the column of the set value [kW] is a set value determined by the demand controller control device 17 on the day when the maximum demand power for each month is measured. Table 1 includes examples in which the school-side maximum power demand exceeded the estimated school-side maximum power demand, which will be described later, and Table 2 shows that the school-side maximum power demand exceeded the estimated school-side maximum power demand. Does not include the example.

  In addition, the value described in the column of the total basic charge [yen] is a basic charge determined by the contract power in each month. The values listed in the School Basic Charge [Yen] and Air Conditioning Basic Charge [Yen] fields are divided into the total basic charge based on the maximum school demand and air conditioning maximum demand for each month. An example is shown. The values described in the column of the school side ratio and the air conditioning side ratio indicate the ratio of the school side basic charge to the total basic charge and the ratio of the air conditioning side basic charge to the total basic charge, respectively.

  FIG. 2 is a flowchart showing the operation of the overall power integrated device 14.

  First, the total maximum demand power calculation unit 141 initializes a storage area provided in the total maximum demand power calculation unit 141 (step S1). Specifically, the storage contents such as later-described maximum daily demand power and daily average temperature stored in a storage area provided in the overall maximum demand power calculating unit 141 are initialized, and the process proceeds to step S2. The storage area in which the maximum demand power and the average temperature on the day are stored is an auxiliary storage area used for calculating the maximum demand power and the average temperature on a daily basis. It is initialized every day by initialization at.

  In step S2, overall average demand power calculation processing is performed. Specifically, average average demand power is calculated for a predetermined time (for example, 30 minutes) based on the total power measured by the total power meter 33 and input to the total maximum demand power calculation unit 141. Move.

  In step S3, it is determined whether or not the average demand power calculated in step S2 is larger than the current day maximum demand power stored in the storage area of the overall maximum demand power calculation unit 141. If this determination is YES, the process proceeds to step S4, and if NO, the process proceeds to step S5.

  In step S4, the average demand power calculated in step S2 is updated to the maximum demand power on the day, and the process proceeds to step S5. Therefore, among the total average demand power calculated at any time in step S2 described above, the largest one is stored in the storage area of the total maximum demand power calculation unit 141 as the maximum demand power on the day.

  In step S5, the average temperature is measured based on the temperature measured by the environment information input unit 153 and input to the total maximum demand power calculation unit 141 and the same day average temperature stored in the total maximum demand power calculation unit 141. The calculated average temperature is stored as the average temperature on the day, and the process proceeds to step S6.

  In step S6, it is determined whether or not to perform end processing. Specifically, whether the calculation of the total maximum demand power and the average temperature for each day is finished by referring to a timer built in the total maximum demand power calculation unit 141 and determining whether or not the date has been updated. Determine whether or not. If this determination is YES, the process proceeds to step S7, and if NO, the process proceeds to step S2. In addition, the value memorize | stored in the day's maximum demand power and the day average temperature at the time of having determined as YES in this step S6 is the total maximum demand power and average for each day calculated by the total maximum demand power calculation unit 141 Corresponds to the temperature.

  In step S7, an overall maximum demand power output process is performed. Specifically, the total maximum demand power calculation unit 141 calculates the calculated total maximum demand power and average temperature, the date of the current day, and data indicating whether the date is classified as a holiday or a weekday. Including, it outputs to the whole electric power memory | storage part 142, and moves to step S8.

  In step S8, a storage process is performed. Specifically, the total power storage unit 142 classifies and stores the total maximum demand power, the average temperature, and the date input from the total maximum demand power calculation unit 141, classified as either holidays or weekdays, and step S1. Move on. In this way, the overall maximum demand power, the average temperature, and the date calculated by the overall maximum demand power calculation unit 141 are stored in the overall power storage unit 142. In step S8, the total maximum demand power is calculated and stored in the total power storage unit 142 as described in the column of total maximum demand power [kW] in Tables 1 and 2.

  In addition, in the process shown by the above steps S1-S8, although the total maximum demand electric power for every day is memorize | stored, it does not restrict to this. By performing the same processing, it is possible to store the entire maximum demand power every 30 minutes.

  FIG. 3 is a flowchart showing the operation of the school-side power accumulation device 15.

  First, the school-side maximum demand power calculation unit 151 performs initialization (step S21). Specifically, the storage content of the same day maximum demand power described later stored in a storage area (for example, RAM) provided in the school side maximum demand power calculation unit 151 is initialized, and the process proceeds to step S22. The storage area in which the maximum demand power for the day is stored is an auxiliary storage area used for calculating the maximum demand power for each day, and the stored contents are stored every day by initialization in step S21. It is initialized to.

  In step S22, school side average demand power calculation processing is performed. Specifically, based on the total power measured by the school-side power meter 31 and input to the school-side maximum demand power calculating unit 151, an average average power demand for a predetermined time (for example, 30 minutes) is calculated. The process moves to S23.

  In step S23, it is determined whether or not the average demand power calculated in step S22 is larger than the maximum demand power on the day provided in the school side maximum demand power calculation unit 151. If this determination is YES, the process proceeds to step S24, and if NO, the process proceeds to step S25.

  In step S24, the average demand power calculated in step S22 is updated to the maximum demand power on the day, and the process proceeds to step S25. Accordingly, among the school-side average demand power calculated at any time in step S22 described above, the largest one is stored in the storage area of the school-side maximum demand power calculation unit 151 as the maximum demand power on the day.

  In step S25, it is determined whether or not to perform end processing. Specifically, whether or not to end the calculation of the school-side maximum demand power for each day by referring to a timer built in the school-side maximum demand power calculation unit 151 and determining whether or not the date has been updated. Is determined. If this determination is YES, the process proceeds to step S26, and if NO, the process proceeds to step S22. In addition, the value memorize | stored in the day maximum demand power at the time of having determined as YES in this step S25 respond | corresponds to the school side maximum demand power for every day calculated by the school side maximum demand power calculation part 151. FIG.

  In step S26, a school-side maximum demand power output process is performed. Specifically, the school-side maximum demand power calculation unit 151 outputs the calculated school-side maximum demand power together with the date of the day to the school-side power storage unit 152, and proceeds to Step S27.

  In step S27, a storage process is performed. Specifically, the school-side power storage unit 152 stores the school-side maximum demand power and date input from the school-side maximum demand power calculation unit 151, and proceeds to step S21. Thus, the school-side maximum demand power and date calculated by the school-side maximum demand power calculation unit 151 are stored in the school-side power storage unit 152. In step S27, the school-side maximum demand power is calculated and stored in the school-side power storage unit 152 as described in the column of school-side maximum demand power [kW] in Tables 1 and 2. The

  In addition, in the process shown by the above steps S21-S27, although the school side maximum demand electric power for every day is memorize | stored, it does not restrict to this. By performing the same processing, it is possible to store the school-side maximum power demand every 30 minutes.

  FIG. 4 is a flowchart showing the operation of the demand controller control device 17.

  The following operation of the demand controller control device 17 is started when the date is updated by a timer built in the demand controller control device 17.

  First, the set value determination unit 171 performs initialization (step S41). Specifically, initial storage contents such as estimated contract power (described later) stored in a storage area (for example, RAM) provided in the set value determination unit 171, estimated school-side maximum demand power, and room for air conditioning power are initially stored. And the process proceeds to step S42.

  In step S42, a contract power estimation process for estimating the contract power for the current month is performed. Specifically, the set value determination unit 171 reads the overall maximum demand power for the past 12 months including the current month stored in the overall power storage unit 142, and uses the largest overall maximum demand power as the estimated contract power. Determine and move to step S43. The estimated contract power determined here is stored in a predetermined storage area of the set value determination unit 171. In step S42, the contract power is calculated as described in the column of contract power [kW] in Tables 1 and 2.

  In step S43, the school side electric power estimation process which estimates the maximum demand electric power of the school side electric power used by the school side equipment group 21 on the day is performed.

  Specifically, among the data of the previous year on the day when this process is performed, the value of the school-side maximum power demand for the week including the same day in the same month is read. In addition, if the day is a school weekday, the maximum power demand on the school side read here reads the value of the school side maximum power demand classified on weekdays, and if the day is a holiday, the school side classified as a holiday Read the value of maximum power demand. Next, the read value of the school side maximum demand power is averaged, this is determined as the estimated school side maximum demand power, and the process proceeds to step S44. In addition, the estimated school-side maximum power demand determined here is stored in a predetermined storage area of the set value determination unit 171.

  In addition, the school side electric power estimation process performed by this step S43 is not restricted to the procedure demonstrated here. For example, among the data for the previous year on which the processing is performed, the value of the school-side maximum power demand in the same month is read, and the average of these values may be used as the estimated school-side maximum power demand.

  Moreover, the period of the value of the school side maximum demand electric power to read is not restricted to the previous year, and may extend over the past two years or more.

  Moreover, since the school-side power storage unit 152 stores the environmental information such as the average temperature along with the value of the school-side maximum demand power, the school-side maximum demand power may be read based on such environment information. .

  In step S44, a margin of air conditioning power that can be used in the air conditioning equipment group 22 on the day is estimated. Specifically, the estimated school-side maximum demand power is subtracted from the estimated contract power to estimate the margin of air conditioning power, and the process proceeds to step S45. Further, the estimated margin for air conditioning power is stored in a predetermined storage area of the set value determining unit 171.

  For example, the contract power for the current month is estimated to be 300 [kW] based on the past overall maximum power demand, and the school-side maximum power demand for the school-side power used in the school-side load facility group 21 for the current month is 200. When it is estimated that [kW] and the school-side maximum power demand of the school-side power used in the school-side equipment group 21 on the day is 130 [kW], the air-conditioning equipment on the day The margin of air conditioning power that can be used in the group 22 is estimated to be 170 [kW].

  In step S45, it is determined whether or not the estimated margin of the air conditioning power is larger than the known rated power of the air conditioning equipment group 22 in advance. If this determination is YES, it is determined that the overall maximum demand power does not exceed the contract power even if the air conditioning equipment group 22 is operated at the rated power, and the process proceeds to step S46. If this determination is NO, the process proceeds to step S47.

  In step S46, the rated power of the air conditioning equipment group 22 is output to the demand controller 16 as a set value of the demand controller 16, and the process ends.

  In step S <b> 47, it is determined whether or not the estimated margin of air conditioning power is larger than the basic setting value input from the basic setting value input unit 172. If this determination is YES, the air conditioning power used in the air conditioning equipment group 22 is operated with power larger than the basic setting value, and the total maximum demand power is not likely to exceed the contract power, and the process proceeds to step S48. . If this determination is NO, even if the overall maximum demand power may exceed the contract power, it is determined that the air conditioning equipment group 22 needs to be operated at the basic set value, and the process proceeds to step S49.

  In step S48, the estimated surplus air-conditioning power is output to the demand controller 16 as a setting value of the demand controller 16, and the process ends.

  In step S49, the basic setting value input from the basic setting value input unit 172 is output to the demand controller 16 as the setting value of the demand controller 16, and the process ends.

  In these steps S46, S48, and S49, as described in the setting value [kW] column of Tables 1 and 2, the setting value is determined.

  FIG. 5 is a flowchart showing the operation of the demand controller 16.

  First, the power control determination unit 161 determines whether or not a set value has been input from the demand controller control device 17 (step S61). If this determination is YES, the process proceeds to step S62, and if NO, the process proceeds to step S61.

  In step S62, it is determined whether or not to perform end processing. Specifically, it is determined whether or not to perform the end process by determining whether or not the date has been updated with reference to a timer built in the power control determination unit 161. If this determination is YES, the process proceeds to step S61, and if NO, the process proceeds to step S63.

  In step S63, power suppression control determination processing is performed. Specifically, the magnitude relationship between the air conditioning power input from the air conditioning wattmeter 32 and the set value input from the demand controller control device 17 is evaluated, and the process proceeds to step S64.

  In step S64, based on the magnitude relationship evaluated in step S63, it is determined whether the air conditioning power is larger than a set value. If this determination is YES, it is determined that the air conditioning power used in the air conditioning equipment group 22 is not an appropriate amount, and the process proceeds to step S65. If NO, the determination is appropriate and the process proceeds to step S62.

  In step S65, a warning signal output process is performed. Specifically, the power control determination unit 161 outputs a warning signal to the warning sound output unit 162 and the power suppression control unit 163, and proceeds to step S62. Based on the output of the warning signal, the warning sound output unit 162 generates a warning sound for notifying that the air conditioning power exceeds the set value of the demand controller 16, and the power suppression control unit 163 The air conditioning equipment group 22 is controlled so as to suppress the air conditioning power used in the air conditioning equipment group 22. Thereby, air-conditioning electric power can be stored in the appropriate range defined by the set value.

  In addition, the administrator who manages the air conditioning power can recognize that the air conditioning power used in the air conditioning equipment group is not appropriate by listening to the sound of the warning sound, and therefore adjust the air conditioning power promptly. Can do.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.

  For example, in the embodiment, the environment information input unit 153 is provided in the school-side power accumulation device 15, but is not limited thereto, and may be provided in the overall power accumulation device 14. You may provide in both the whole power integrated devices 14. FIG. In any case, the environment information input unit 153 is provided so that the environment information input by the environment information input unit 153 is stored in either the school-side power storage unit 152 or the overall power storage unit 142. It is preferable.

  In addition, the environmental information input by the environmental information input unit 153 is the air temperature, but is not limited thereto, and may include humidity, sunshine rate, and the like. By inputting such environmental information, the set value determination unit 171 can determine the set value of the demand controller 16 in accordance with the actual use of the school side equipment group 21 and the air conditioning equipment group 22.

It is a block diagram which shows the whole structure of the maximum demand power control system of this invention. It is a flowchart which shows operation | movement of the whole maximum demand power integration apparatus of the maximum demand power control system of this invention. It is a flowchart which shows operation | movement of the 1st maximum demand power integration | stacking apparatus of the maximum demand power control system of this invention. It is a flowchart which shows operation | movement of the demand controller control apparatus of the maximum demand power control system of this invention. It is a flowchart which shows operation | movement of the demand controller of the maximum demand power control system of this invention. It is a graph which shows maximum demand electric power and contract electric power. It is a graph which shows the concept of average demand power.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Maximum demand power control system 11 Switch 19 Branch part 12 Instrument transformer 13 Instrument transformer 31 School side power meter 32 Air-conditioning power meter 33 Overall power meter 21 School side equipment group (1st load equipment group)
22 Air conditioning equipment group (second load equipment group)
14 Overall power integrated device 141 Overall maximum demand power calculation unit (Overall maximum demand power calculation means)
142 Total power storage unit (total maximum demand power storage means)
15 School side power accumulation device 151 School side maximum demand power calculation part (1st maximum demand power calculation means)
152 School-side power storage unit (first maximum demand power storage means)
153 Environmental information input section (environmental information input means)
16 Demand controller 161 Power control determination unit 162 Warning sound output unit (warning sound output means)
163 Power suppression control unit (power suppression control means)
17 Demand controller control device 171 Setting value determining unit (setting value determining means)
172 Basic set value input section (Basic set value input means)

Claims (9)

A switch connected to the distribution line;
A first load facility group and a second load facility group that are branched and connected at a branch portion connected downstream from the switch;
An overall power measuring means connected between the switch and the branching section via an instrument transformer to measure the overall power used in the first load equipment group and the second load equipment group;
A first power measuring means connected between the branching section and the first load equipment group via a meter transformer to measure the first power used in the first load equipment group;
Second power measuring means for measuring second power used in the second load equipment group;
An overall maximum demand power calculating means for calculating an overall maximum demand power based on the overall power measured by the overall power measuring means;
Total maximum demand power storage means for storing the calculated total maximum demand power;
First maximum demand power calculating means for calculating a first maximum demand power based on the first power measured by the first power measuring means;
First maximum demand power storage means for storing the calculated first maximum demand power;
A demand controller that determines whether or not the second power has an appropriate magnitude based on the measured second power and the input set value, and outputs a warning signal based on the determination;
A demand controller controller that determines the set value based on the stored total maximum demand power and the stored first maximum demand power, and outputs the determined set value to the demand controller. A feature of maximum demand power control system. The maximum demand power control system according to claim 1,
The total maximum demand power storage means and the first maximum demand power storage means continue to store past total maximum demand power and first maximum demand power for at least 12 months, respectively. Control system. In the maximum demand power control system according to claim 1 or 2,
The overall maximum demand power storage means stores the overall maximum demand power every predetermined time,
The first maximum demand power storage means stores a first maximum demand power every predetermined time, and the maximum demand power control system. The maximum demand power control system according to any one of claims 1 to 3,
Environmental information input means for automatically inputting environmental information at the place where the first load equipment group or the second load equipment group is installed into the overall maximum demand power calculation means or the first maximum demand power calculation means In addition,
The overall maximum demand power storage means or the first maximum demand power storage means stores the environment information input by the environment information input means,
The demand controller control device determines the setting value based on the stored overall maximum demand power, the stored first maximum demand power, and the stored environment information, and is determined A maximum demand power control system, wherein a set value is output to the demand controller. In the maximum demand power control system in any one of Claim 1 to 4,
The demand controller control device further includes basic set value input means for inputting a basic set value of the set value in accordance with load equipment constituting the second load equipment group, and the input basic set value and The maximum demand power control system, wherein the set value is determined based on the stored overall maximum demand power and the stored first maximum demand power. In the maximum demand power control system in any one of Claim 1 to 5,
The first load facility group and the second load facility group are composed of load facilities in a school,
The maximum load power control system, wherein the second load equipment group includes a plurality of air conditioning equipment additionally installed in the school. The maximum demand power control system according to claim 6,
The overall maximum demand power storage means and the first maximum demand power storage means store the overall maximum demand power and the first maximum demand power, respectively, classified into the school holidays and weekdays. And maximum demand power control system. In the maximum demand power control system in any one of Claim 1 to 7,
The demand controller includes a warning sound output means for generating a warning sound based on the output of the warning signal. In the maximum demand power control system in any one of Claim 1 to 8,
The maximum demand power control system, wherein the demand controller further includes power suppression control means for controlling to suppress the magnitude of the second power based on the output of the warning signal.

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