JP2006047195A - Control system for annually used electrical energy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system for an annually used electrical energy, capable of restraining the electrical energy used at a proper time point for controlling the annually used electrical energy. <P>SOLUTION: An internal quality measuring instrument is provided with a watt-hour meter 7 for measuring the electrical energy in an electrical line of a consumer; a demand monitoring controller 10 for controlling the used electrical energy to make the electric energy within a demand time interval that does not exceed anyone of a plurality of demanded amounts; a consumed electrical energy storing means 13 for storing the electrical energy; a target electrical energy calculating means 14 for calculating the target electrical energy for each prescribed time interval this year, from the electrical energy in one year in the past and a reduction rate of used electric power, and an annual used electrical energy controller 12A having a consumed electrical energy control means for issuing a command to the demand monitoring controller to change the demanded amount, when a predicted integrated used electrical energy in the prescribed time interval predicted, based on an integrated used electrical energy from a start to an optional time point for each prescribed time interval and based on the used electrical energy in the time point exceeds or is lower than the target integrated electrical energy. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an annual power consumption management system that manages the annual power consumption in consumers who apply the Energy Saving Law.

  The conventional demand monitoring support method calculates the predicted power amount every moment when the power is used at the increasing rate of the current demand value (the current power amount used in the current demand period), and this predicted power amount is contracted. When the amount of electric power is exceeded, an alarm is issued to alert the observer. In addition, a predicted power consumption calculation is performed to command power on / off to a load mainly composed of an air conditioner so that the power consumption does not exceed the contract power consumption (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-240360

  However, when the annual plan for reducing the use of electric power is created and put into practice based on the Law on the Rational Use of Energy (hereinafter referred to as the Energy Conservation Law), the maximum amount of power used in the demand period of about 30 minutes There is a problem that it cannot be put into practice as an annual plan only by measurement, prediction, and suppression. In other words, for the implementation of the annual plan, it is necessary to monitor, aggregate and control over the year. Traditionally, these are aggregated in the form of a monthly report by a person, and based on this, the person performs control for power saving. It must be commanded, and it takes time to count and cannot be controlled at an appropriate time.

  An object of the present invention is to provide an annual power consumption management system that controls the annual power consumption by suppressing the power consumption at an appropriate point in the implementation of the annual plan.

  The annual power consumption management system of the present invention includes a watt-hour meter that measures the amount of power used in a customer's power system, and the amount of power that is used within the time period for each predetermined demand time period. A demand monitoring control device that monitors and controls the amount of power used by the consumer so as not to exceed any one of a plurality of predetermined demand amounts, and a demand power amount storage means that stores the power amount, the past year at the beginning of the year Target power amount calculating means for calculating a target power consumption amount for each predetermined time period of the current fiscal year based on the above-mentioned power amount for a predetermined time and a predetermined power consumption reduction rate, and for each time point with a predetermined sampling time period as the period The accumulated power consumption from the beginning of a predetermined time period to the time point is obtained, and the cumulative power consumption amount and the average value of the power consumption amount of at least one sampling time period before the time point The predicted cumulative power consumption up to the next time point is obtained, and when the predicted cumulative power consumption exceeds or falls below the target cumulative power consumption allocated at the next time point, the demand amount change is monitored. And an annual power consumption management device having a demand power amount control means for instructing the control device.

  The effect of the annual power consumption management system according to the present invention is that the power consumption for the past year is stored and the target power consumption for each predetermined time period for the next year is set by setting the power consumption reduction rate of the annual plan. From the beginning of the time period determined from the accumulated power consumption from the beginning of the predetermined time period to the time point and the power consumption of the sampling time period prior to the time point for each time point having a predetermined sampling time period When the predicted cumulative power consumption up to the next time point exceeds or falls below the target cumulative power consumption value assigned to the next time point, the demand monitoring control device is instructed to change the demand amount. Accordingly, the amount of power used is controlled according to the above, and the amount of power used is reduced toward the annual reduction target without performing complicated manual operations.

Embodiment 1 FIG.
FIG. 1 is a power system diagram of a customer provided with an annual power consumption management system according to Embodiment 1 of the present invention. FIG. 2 is a functional block diagram of the annual power consumption management apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a data structure of a table in which daily power demand and the like are stored. FIG. 4 is a diagram illustrating a data structure of a table in which monthly power consumption and the like are stored. FIG. 5 is a graph plotting the previous year's performance and the cumulative power consumption of the current year's plan. FIG. 6 is a diagram illustrating a case where the predicted cumulative monthly usage power amount exceeds the target cumulative monthly usage power amount. FIG. 7 is a diagram illustrating a case where the predicted cumulative monthly usage power amount is lower than the target cumulative monthly usage power amount.

As shown in FIG. 1, a customer's power system 2 receives power from a commercial power system 3 at a power receiving point 4, and includes an air conditioner 5a, pump motors 5b, 5c, lighting 5d and the like provided in the customer. Electric power is supplied to electrical equipment. Electric power is supplied to the pump motor 5c and the illumination 5d in the electrical equipment through a load control panel 6 that controls the amount of power used. On the other hand, the air conditioning equipment 5 a and the pump motor 5 b are directly connected to the power system 2.
In addition, the power system 2 is provided with a watt hour meter 7 for measuring the amount of power used. Then, the instantaneous voltage value is input from the meter transformer 8 provided in the power system 2 and the instantaneous current value is input from the meter current transformer 9 to the watt hour meter 7.

  The electricity charge at the consumer is composed of a basic charge and an electricity charge. The basic charge is determined based on the largest value of the maximum demand power in the past year. The electric energy charge is determined in proportion to the electric energy used. The demand power is an average value of the amount of power used for a predetermined demand time period, for example, every 60 minutes, measured by the watt-hour meter 7. Moreover, the maximum demand power of the month is the maximum demand power in the month.

  Since the power rate is determined in this way, in order to prevent the demand power from exceeding the maximum demand power, the power amount of the consumer power system 2 should not exceed a predetermined target demand amount. Is provided with a demand monitoring control device 10 for adjusting the power usage of the electrical equipment. Then, the demand monitoring control device 10 is connected to the electrical equipment via the signal line 11, and a control signal is transmitted from the demand monitoring control device 10 to the electrical equipment.

  The demand monitoring control device 10 is based on the accumulated power amount from the beginning of a predetermined demand time period, for example, 60 minutes, to an arbitrary measurement time point, and the amount of power change during the sampling interval before the measurement time point, for example, 5 minutes. Demand power for the demand time period is predicted, and control is performed by turning on / off electrical equipment so that it does not exceed the target demand.

Furthermore, customers who fall under the “Type 1 Designated Energy Management Factory” of the Energy Conservation Law are required to plan and implement reductions in medium- to long-term power usage. For this purpose, the annual power consumption management device 12 </ b> A is connected to the demand monitoring control device 10. The annual power consumption management device 12A is configured by a computer having a CPU, a RAM, a ROM, an interface circuit, and the like.
The annual power consumption management system 1A according to the first embodiment includes an watt-hour meter 7, a demand monitoring control device 10, and an annual power consumption management device 12A.

As shown in FIG. 2, the annual power consumption management device 12A includes a demand power amount storage means 13 for storing demand power for each demand period from the demand monitoring control device 10 in a table for one year. Calculate the monthly power consumption as a predetermined time period of the past year from the power consumption of the past, and from the annual power consumption reduction rate set as the annual plan and the monthly power consumption for the past year The target power consumption calculating means 14 for calculating the target power consumption for each month of the current fiscal year is provided. In addition, although a predetermined time limit will be described below as a month, the present invention can also be applied as a season or a week.
Furthermore, the annual power consumption management device 12A sets a predetermined sampling time period as a day, and from the beginning of the month to the next day determined from the accumulated power consumption accumulated from the beginning of the month to the current day and the power consumption of the day. It is determined whether or not the predicted cumulative power consumption exceeds the target cumulative power consumption set on the next day, and if it exceeds, an energy saving application signal is transmitted to the demand monitoring control device 10, and the predicted cumulative power consumption is the target cumulative power consumption. When the amount is less than the amount, a demand power amount control means 15 for transmitting an energy saving release signal to the demand monitoring control device 10 is provided.

  Next, the management of the power consumption performed using the annual power consumption management device 12A will be described. One year starts on January 1 and ends on December 31, the predetermined time period is January, and the predetermined sampling time period is one day. In the demand monitoring control apparatus 10, 60 minutes is set as the demand time limit and two demand quantities are set. One demand quantity is contract power contracted with an electric power company, and the other demand quantity is a low demand quantity 30% smaller than the contract power. And it is controlled so that the demand power of the demand time limit is within the demand amount or the low demand amount selected for each demand time period. Further, when the demand monitoring control device 10 receives the energy saving application signal from the annual power consumption management device 12A, the demand monitoring control device 10 controls the demand power by changing the demand amount to a low demand amount. Furthermore, when the demand monitoring control device 10 receives the energy saving cancellation signal from the annual power consumption management device 12A, the demand monitoring control device 10 changes the low demand amount to the demand amount and controls the demand power.

As shown in FIG. 3, the demand power amount storage means 13 receives demand power x _kib (kW) (b is a positive integer from 1 to 24) from the demand monitoring control device 10 for each demand time period on an arbitrary k month i day. Represents each demand time period, i is 1 to N, N is the working day of the month, k is any one of 1 to 12, and represents the month), and used electric energy y _kib (kWh) Convert to In this case, the power consumption y _kib is obtained from y _kib = x _ib × 1 (h). Then, the power usage amount y _kib is accumulated to obtain the daily power usage amount p _ki (kWh) for i day, and is stored.
Further, as shown in FIG. 4, the demand power amount storage means 13 accumulates the daily use power amount p _ki of the operation day of k month to obtain the accumulated monthly use power amount P _{k, 1, i} and stores it. To do. The accumulated monthly power consumption P _{k, 1, i} is a cumulative value of the daily power consumption from day 1 to day i. The accumulated monthly power consumption P _{k, 1, N} from day 1 to day _N is the monthly power consumption.
In this way, the monthly power consumption P _{k, 1, N} is stored in the demand power storage 13 for one year. FIG. 5 is a diagram illustrating a state in which actual cumulative power consumption Q1 _{, k obtained} by accumulating monthly power consumption _{Pk, 1, N} from January to December is plotted. Here, the actual cumulative power consumption Q _{1, k} is a cumulative value of the monthly power consumption P _{k, 1, N} from January to k month.

Next, the target power consumption calculating means 14 multiplies the monthly power consumption P _{k, 1, N} for the past year by the power consumption reduction target value (hereinafter referred to as a reduction rate) for the next year. The monthly target power consumption W _k for each month for the next year is _obtained . Shows this month target power usage W _k target cumulative monthly electric power consumption R _{1, k} obtained by accumulating from January to December as a dotted line in FIG. 5. The target cumulative monthly power consumption R _{1, k} is a cumulative value of the monthly target power consumption W _k from January to k month.

Next, as shown in FIG. 6, the demand power amount control means 15 calculates the target accumulated daily power consumption S _{k, 1, i for} each working day from the monthly target power consumption W _k and the number of working days N in k months. Ask for. The goal cumulative Date use the amount of power S _{k, 1, i} is a value obtained by accumulating the target electric power consumption day by dividing the month target electric power consumption W _k in the number of workdays N from one day to day i.

Next, the demand power amount control means 15 uses the accumulated monthly use power amount P _{k, 1, i} obtained by accumulating the actual use power amount from the beginning of the month to the i-th day from the demand monitoring control device 10 as the demand power amount. Obtained from the storage means 13.
Then, using the cumulative monthly power consumption P _{k, 1, i} and the daily power consumption p _ki on the current day i, the predicted cumulative monthly power consumption P _{k, 1} , from the first day to the next day (i + 1) day is used _{. (I + 1)} is obtained according to equation (1).

P _{k, 1, (i + 1)} = P _{k, 1, i} + p _ki (1)

The power demand control means 15 determines that the predicted cumulative monthly power consumption P _{k, 1, (i + 1)} exceeds the target cumulative monthly power consumption _{Sk, 1, (i + 1)} as shown in FIG. At this time, an energy saving application signal is transmitted to the demand monitoring control device 10. When the demand monitoring control device 10 receives the energy saving application signal, the demand monitoring control device 10 uses a low demand amount that is about 30% smaller than the demand amount that has been used so far, so that the power demand does not exceed the low demand amount for each demand period. Control the power supply. By controlling the power consumption in this way, the power consumption can be suppressed below the monthly target power consumption W _k .

Further, as shown in FIG. 7, the predicted cumulative monthly power consumption P _{k, 1, i} exceeds the target cumulative monthly power consumption S _{k, 1, i} and the energy saving application signal has already been issued on the previous day. When the power demand control means 15 determines that the predicted cumulative monthly power consumption P _{k, 1, (i + 1)} is less than the target cumulative monthly power consumption S _{k, 1, (i + 1)} , the energy saving cancellation signal Is transmitted to the demand monitoring control apparatus 10.

  In such an annual power consumption management system, the past demand power is stored, the target power consumption is obtained according to the reduction rate of the annual plan, and the demand amount is such that the power consumption is less than the target power consumption. Since it is changed, it is possible to implement the annual reduction target without complicated manual operation.

In the first embodiment, when the predicted cumulative monthly power consumption until the next day exceeds or falls below the target cumulative monthly power consumption, the demand monitoring control device is instructed to change the demand amount. The same effect can be obtained by determining whether the predicted cumulative monthly power consumption up to the target cumulative monthly power consumption is instructed and changing the demand amount.
Moreover, although the electric energy consumption only for the day is used for the prediction of the prediction accumulation monthly electric energy consumption to the next day, you may perform prediction using the average value of the electric energy consumption of several days.

Embodiment 2. FIG.
FIG. 8 is a power system diagram of a consumer provided with an annual power consumption management system according to Embodiment 2 of the present invention. FIG. 9 is a functional block diagram of the annual power consumption management apparatus according to the second embodiment.
In the annual power consumption management system 1B according to the second embodiment, as shown in FIG. 8, the demand monitoring control device 10 of the annual power consumption management system 1A according to the first embodiment is omitted. On the other hand, the air-conditioning equipment 5a and the pump motor 5b have a power saving operation mode in which the power used is reduced by an external suppression signal and returned to normal by the suppression release signal, as with the load control panel 6.
The annual power consumption management device 12B according to the second embodiment receives the power consumption directly from the power meter 7.
The annual power consumption management device 12B is connected to the air conditioning equipment 5a, the pump motor 5b, and the load control panel 6 via the signal line 11, and a suppression / suppression release signal is directly input from the annual power consumption management device 12B. The

  As shown in FIG. 9, the annual power consumption management device 12B includes a power consumption storage unit 18 and a power consumption amount instead of the demand power storage unit 13 of the annual power consumption management device 12A according to the first embodiment. Instead of the control means 15, a power consumption control means 19 is provided. The other parts are the same as those of the annual power consumption management apparatus 12A according to the first embodiment, and thus the same reference numerals are given to the same parts and the description thereof is omitted.

Unlike the demand power amount storage means 13 of the first embodiment, the used power amount storage means 18 directly receives the used power amount from the watt hour meter 7. Therefore, the used power amount for 24 hours is integrated and used daily. _Find p _ki (kWh) and store it. Since it is the same as that of the demand electric energy storage means 13 of Embodiment 1 after this, description is abbreviate | omitted.

Next, the used electric energy control means 19 is the same as the demand electric energy control means 15 of the first embodiment until the predicted cumulative monthly used electric energy P _{k, 1, (i + 1)} is obtained, and thus the description thereof is omitted. .
When the predicted cumulative monthly power consumption P _{k, 1, (i + 1)} exceeds the target cumulative monthly power consumption S _{k, 1, (i + 1)} , a suppression signal is sent to the electrical equipment in a predetermined order. Is changed to the power saving operation mode. The use amount of power in the power saving operation mode is reduced, it is possible to suppress the amount of electric power used in the following month target power usage W _k.
Further, when the predicted cumulative monthly power consumption P _{k, 1, (i + 1)} is lower than the target cumulative monthly power consumption S _{k, 1, (i + 1)} , the electrical equipment is restrained in the order opposite to the order of sending the restraint signals. Send a release signal and return the operation mode to normal.

  Such an annual electric energy management system is an electric power system equipped with an electric facility with a power saving operation function, a load control panel, etc., even if no demand monitoring control device is installed. Since they directly control them, it is possible to suppress the annual power consumption of consumers to below the target regardless of human hands.

In addition, although 60 minutes was demonstrated and demonstrated as an example as a demand time limit, even if it is 30 minutes and 15 minutes, this invention can be applied similarly.
In addition, although the present invention has been described with an example in which the target power consumption is set monthly, the annual power usage is controlled by setting the target power consumption every season or week and controlling the actual value to be lower than that. The amount of power can be reduced.

1 is a power system diagram of a consumer provided with an annual power consumption management system according to Embodiment 1 of the present invention. 1 is a functional block diagram of an annual power consumption management apparatus according to Embodiment 1. FIG. It is a figure which shows the data structure of the table in which the daily power demand etc. were memorize | stored. It is a figure which shows the data structure of the table in which the usage electric energy etc. for every month were memorize | stored. It is the figure which plotted the previous year performance and the accumulated electric energy consumption of this year plan. It is a figure which shows the case where a prediction accumulation monthly use electric energy exceeds target accumulation month use electric energy. It is a figure which shows the case where a prediction accumulation monthly use electric energy is less than a target accumulation month use electric energy. It is an electric power system diagram of the consumer provided with the annual electric energy consumption management system concerning Embodiment 2 of this invention. 6 is a functional block diagram of an annual power consumption management apparatus according to Embodiment 2. FIG.

Explanation of symbols

  1A, 1B Annual power consumption management system, 2 Power system, 3 Commercial power system, 4 Power receiving point, 5a Air conditioning equipment, 5b, 5c Pump motor, 5d Lighting, 6 Load control panel, 7 Energy meter, 8 Transformer for instrument 9 Current transformer for meter, 10 Demand monitoring and control device, 11 Signal line, 12A, 12B Annual power consumption management device, 13 Demand power storage device, 14 Target power calculation device, 15 Demand power control device, 18 Power consumption storage means, 19 Power consumption control means.

Claims (2)

A watt-hour meter that measures the amount of power used in a customer's power system;
Demand monitoring control for monitoring and controlling the amount of power used by the consumer so that the amount of power used within the predetermined time interval does not exceed any one of a plurality of predetermined demand amounts. Equipment,
Demand power amount storage means for storing the power amount, a target for calculating a target power consumption amount for each predetermined time period of the current year based on the power amount for the past year at the beginning of the year and a predetermined power consumption reduction rate For each time point having a period of power amount calculation means and a predetermined sampling time period, a cumulative power consumption amount from the start of the predetermined time period to the time point is obtained, and the cumulative power consumption amount and at least one sampling time period before the time point are determined. A predicted cumulative power consumption amount from the beginning to the next time point is calculated from the average value of the power consumption amount, and the predicted cumulative power consumption amount exceeds the target cumulative power consumption amount allocated at the next time point, or An annual power consumption management device having a demand power amount control means for instructing the demand monitoring control device to change the demand amount,
An annual power consumption management system characterized by being equipped with. Electrical facilities that have power-saving operation functions and are provided to consumers;
A watt-hour meter that measures the amount of power used in the customer's power grid;
A power consumption storage means for storing the power consumption, a target for calculating a target power consumption for each predetermined time period of the current year based on the power consumption for the past year at the beginning of the year and a predetermined power consumption reduction rate For each time point having a period of power amount calculation means and a predetermined sampling time period, a cumulative power consumption amount from the start of the predetermined time period to the time point is obtained, and the cumulative power consumption amount and at least one sampling time period before the time point are determined. A predicted cumulative power consumption amount from the beginning to the next time point is calculated from the average value of the power consumption amount, and the predicted cumulative power consumption amount exceeds the target cumulative power consumption amount allocated at the next time point, or An annual power consumption management device having a power consumption control means for operating or stopping the power saving operation function of the electrical equipment when less than,
An annual power consumption management system characterized by being equipped with.

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