JP2013188078A - Electric power demand monitoring device and electric power demand monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power demand monitoring device capable of supporting voluntary power saving effort by a consumer.SOLUTION: An electric power demand monitoring device comprises: a prediction section; a determination section; an output section; and a setting section. The prediction section calculates a prediction value of electric power demand by a consumer on the basis of an electric power amount measured by an electric power meter for measuring the electric power amount individually used by a plurality of loads with which the electric power consumer is provided. The determination section determines whether or not the prediction value exceeds a contract target value on the basis of a contract between an electric power supplier and the consumer. The output section outputs an alarm when the prediction value is determined to exceed the contract target value by the determination section. The setting section is provided to set any target value different from the contract target value. Further, the determination section determines whether or not the prediction value exceeds any target value. The output section outputs an alarm when the prediction value is determined to exceed any target value by the determination section.

Description

  Embodiments described herein relate generally to a power demand monitoring apparatus and a power demand monitoring method that monitor power demand prediction of power consumption in a building and issue an alarm when there is a risk of exceeding contract power consumption.

  A contract for maximum power demand is made between a large-scale power consumer such as a factory or a building and a power company that is a supplier of power. When this maximum demand power is exceeded, penalties such as payment of a penalty and an increase in basic charges are imposed, so the consumer manages the power usage so as not to exceed the maximum demand power. A power demand monitoring device is used for this type of application.

  The power demand monitoring device predicts the demand for the average power consumption at the end of the cycle based on the power consumption from the start of the calculation cycle (for example, 30 minutes) of the average power consumption to the present. This indicator is called power demand prediction. When the power demand prediction exceeds the contract power amount, a warning is issued, and the operator is notified that the average power consumption may exceed the contract power amount.

JP-A-8-63132 JP 2011-61991 A JP 2000-184590 A

The existing power demand monitoring device is based on the maximum demand power based on the contract with the power company when monitoring the power consumption. On the other hand, in recent years, the provision of more effective monitoring methods is awaited due to the growing awareness of ecology and the demand for electricity saving. Such needs are increasing with the power shortage accompanying the Great East Japan Earthquake that occurred on March 11, 2011, and the subsequent planned power outages.
An object of the present invention is to provide a power demand monitoring apparatus and a power demand monitoring method capable of supporting voluntary power saving efforts by consumers.

  According to the embodiment, the power demand monitoring apparatus includes a prediction unit, a determination unit, an output unit, and a setting unit. The prediction unit calculates a predicted value of the power demand of the consumer based on the amount of power measured by the power meter that measures the amount of power individually used by the plurality of loads provided to the power consumer. The determination unit determines whether or not the predicted value exceeds a contract target value based on a contract between the power supplier and the consumer. The output unit outputs an alarm when the determination unit determines that the predicted value exceeds the contract target value. The setting unit is provided for setting an arbitrary target value different from the contract target value. Then, the determination unit determines whether or not the predicted value exceeds the arbitrary target value. The output unit outputs an alarm when the determination unit determines that the predicted value exceeds the arbitrary target value.

1 is a system diagram illustrating an example of a monitoring system to which a power demand monitoring apparatus according to an embodiment can be applied. 2 is a functional block diagram illustrating an embodiment of a power demand monitoring apparatus 100. FIG. It is a flowchart which shows an example of the process sequence performed by the power demand monitoring apparatus 100 which concerns on embodiment. It is a figure which shows an example of the graph displayed on the monitor.

  Hereinafter, embodiments will be described. The power demand monitoring apparatus according to the embodiment monitors the power demand of the power consumer, and controls the operation of the equipment in the target facility so that the amount of power used by the consumer does not exceed the contracted power amount. Whether or not the power consumption exceeds the contract power consumption is determined based on the average power consumption in a predetermined period (for example, 30 minutes). This period is called a demand period.

  FIG. 1 is a system diagram illustrating an example of a monitoring system to which the power demand monitoring apparatus according to the embodiment can be applied. In FIG. 1, a power demand monitoring apparatus 100 and local control servers (LCS) 21 to 2m are connected to a local area network (LAN) 400 as a communication network. The upper layer of the LAN 400 is, for example, BACnet (registered trademark). A large screen monitor 200, a power meter 300 for measuring the power consumption (amount) of the building, or a system of a different vendor is connected to the LAN 400. The power meter 300 may be connected to the power demand monitoring apparatus 100 through a dedicated line without going through the LAN 400.

  A node is connected to each of the LCSs 21 to 2m via a communication line. Each node is, for example, an air-conditioning device, lighting device, power device, personal computer, telephone, or other device that consumes electric power, and each node is positioned as a load. The power meter 300 measures the amount of power used individually by a plurality of loads such as nodes, and notifies the power demand monitoring apparatus 100 of the result.

  Each of the LCSs 21 to 2m recognizes a connected node as a monitored device and monitors its state. The power demand monitoring apparatus 100 receives the monitoring result notified from the LCSs 21 to 2m, monitors and controls the system at a higher level, and provides various information to the operator.

  FIG. 2 is a functional block diagram showing an embodiment of the power demand monitoring apparatus 100. The power demand monitoring apparatus 100 includes a setting unit 11, an input unit 12, a power consumption calculation unit 13, a prediction unit 14, a determination unit 15, an alarm output unit 16, a cutoff unit 17, a storage unit 18, a change unit 19, and a monitor controller MC. And a monitor M. These functional blocks are realized as dedicated hardware or software functions realized by the arithmetic processing function of the Central Processing Unit (CPU).

  The setting unit 11 includes a keyboard and a mouse, and functions as a human machine interface for accepting input of various setting data and schedule information. By functioning together with the monitor controller MC and the monitor M, a GUI (Graphical User Interface) environment is constructed. The input unit 12 acquires a power measurement value from the power meter 300.

  The used power amount calculation unit 13 calculates the used power amount at a constant cycle (about 10 seconds to 1 minute) from the power measurement value input via the input unit 12. The prediction unit 14 calculates a predicted value of the power demand of the power consumer at least for each demand cycle based on the calculated power consumption, that is, the power amount (power measurement value) measured by the power meter 300.

  In addition to the contract value (contract target value 18a) of the maximum power demand based on the contract with the power company, the storage unit 18 has a value different from the contract target value, for example, a value obtained by subtracting 15% of the contract target value 18a ( 85%) is stored as an arbitrary target value 18b. The arbitrary target value 18b is set and input using the setting unit 11, for example.

The determination unit 15 determines whether or not the predicted value calculated by the prediction unit 14 exceeds the contract target value 18a. In particular, the determination unit 15 also determines whether or not the predicted value calculated by the prediction unit 14 exceeds the arbitrary target value 18b.
When the determination unit 15 determines that the predicted value exceeds the contract target value 18a, the alarm output unit 16 outputs an alarm such as a visual alarm or an audio alarm. A packet including alarm information may be sent to the LAN 400. In particular, the alarm output unit 16 outputs an alarm even when the determination unit 15 determines that the predicted value exceeds the arbitrary target value 18b. Different alarms may be generated depending on two cases, a case where the predicted value exceeds the contract target value 18a and a case where the predicted value exceeds the arbitrary target value 18b. By generating the alarm, the operator can recognize that the average power consumption at the end of the current demand cycle may exceed the contract power amount or the arbitrary target value.

  When it is determined that the predicted value exceeds one of the contract target value 18a and the arbitrary target value 18b, the blocking unit 17 blocks or stops a part of the operating load based on a predetermined priority order. The priority order is a stop order determined for each load, and is set in advance. For example, a load with a large amount of power consumption but a small number may be preferentially stopped, or a load with a small amount of power consumption but a large number may be preferentially stopped.

  The changing unit 19 changes the value of the arbitrary target value 18b according to factors such as season, day of the week, and time zone. For example, the value of the arbitrary target value 18b is reduced (such as 70% of the contract target value 18a) in the season of relatively low power demand such as spring and autumn, and the target value is arbitrary in the season of high power demand such as summer and winter. The changing unit 19 performs a process of increasing the value of 18b (such as 90% of the contract target value 18a).

  The monitor controller MC acquires data for visual display from the power consumption calculation unit 13, the prediction unit 14, the determination unit 15, and the like, displays these pieces of information on the monitor M in the form of, for example, a web browser, etc. Notice. Next, the operation in the upper configuration will be described.

  FIG. 3 is a flowchart illustrating an example of a processing procedure executed by the power demand monitoring apparatus 100 according to the embodiment. In FIG. 3, the contract target value 18 a and the arbitrary target value 18 b are input using the setting unit 11. Then, the contract target value 18a and the arbitrary target value 18b are stored in the storage unit 18 and set in the system (steps S1 and S2).

  Next, the power demand monitoring apparatus 100 changes the arbitrary target value 18b based on current conditions, that is, conditions such as the current season, day of the week, and time zone (step S3). In the change, there is a form in which a database in which the value of the arbitrary target value 18b is recorded for each condition is prepared in advance and changed in accordance with the contents. Alternatively, a ratio with the contract target value 18a may be registered in advance for each condition, and the arbitrary target value 18b may be changed by calculation based on the ratio.

  Next, the power demand monitoring apparatus 100 acquires a power measurement value (step S4), and calculates a predicted value of power demand based on the value (step S5). When the predicted value is calculated, display control is executed (step S6). For example, two types of graphs as shown in FIG. The power demand monitoring apparatus 100 also calculates the elapsed time from the start of the demand cycle, the remaining time of the demand cycle, the amount of power used, the usable power, the adjusted power, the predicted demand power, etc., and the monitor M also stores these information. You may display together.

  FIG. 4 shows a graph showing the amount of power used at the time of measurement, the predicted value of power amount, and the reference power amount, and this graph is also called a demand monitoring curve. FIG. 4A is a diagram comparing the contract target value 18a and the amount of power used, and a straight line (1) connecting the contract power at the end of the contract in the demand cycle and the origin indicates the reference power. The curve (2) shows the amount of power used in time series. A dotted line indicates a predicted value for predicting the power consumption at the end of the time limit from the current power consumption. The predicted value is obtained by the following equation.

Predicted power = current power + ΔP / Δt × remaining time until the end of time limit Δt: instantaneous time before the current time ΔP: average power at Δt before the current time FIG. 4 (b) shows the curve (2), A straight line (3) reflecting the arbitrary target value 18b is shown. In the embodiment, since contract target value 18a> arbitrary target value 18b, the slope of straight line (3) is gentler than that of straight line (1).

  Next, the power demand monitoring apparatus 100 first compares the predicted value with the contract target value 18a (step S7), and determines that the predicted value is equal to or greater than the contract target value 18a or that the predicted value exceeds the contract target value 18a. Then (Yes), an alarm is output (step S8). Subsequently, the power demand monitoring apparatus 100 specifies the load to be cut off based on the specified priority (step S9).

  That is, the power demand monitoring apparatus 100 determines to stop at least some of the plurality of loads in order to eliminate the determination of Yes in step S7. And the electric power demand monitoring apparatus 100 produces | generates and outputs the signal for interrupting | blocking the specified load, and performs interruption | blocking control (step S10). Following step S10 or if No in step S7, the process proceeds to the next step.

  Next, the power demand monitoring apparatus 100 compares the predicted value with the arbitrary target value 18a (step S11), and determines that the predicted value is equal to or greater than the arbitrary target value 18b or that the predicted value exceeds the arbitrary target value 18b. (Yes) An alarm is output (step S12). According to FIG. 4B, the predicted value is expected to exceed the arbitrary target value 18b soon after the current time, and the alarm output unit 16 generates and outputs an alarm based on this result.

The form of alarm output in step S12 may be the same as or different from step S8. Preferably, the alarm rank in step S8 is higher than the alarm rank in step S12.
Subsequent to step S12 or if No in step S11, the processing procedure for the next demand cycle is started (step S13), and the processing procedure returns to step S3.

  As described above, in this embodiment, the arbitrary target value 18b can be registered in addition to the contract target value 18a, and power demand monitoring targeting the arbitrary target value 18b can also be performed. The arbitrary target value 18b can be positioned as a target value of power demand that is voluntarily set by a power consumer, so that the consumer can be encouraged to more actively manage power and greatly contributes to an energy saving effect.

  Further, in the embodiment, the arbitrary target value 18b is automatically changed based on the season, day of the week, time zone, etc., so that it is possible not only to realize more detailed power demand monitoring, but also by contract alone. It is also possible to raise awareness of power suppression that was not always sufficient.

  Further, in the embodiment, when the predicted value is likely to exceed the contract target value 18a, not only an alarm is output, but also the load is automatically cut off according to the priorities registered in advance. Therefore, the power suppression effect can be further enhanced. Furthermore, it is possible to more effectively cope with the reduction of power consumption required in the recent social situation.

  Accordingly, it is possible to provide a power demand monitoring device and a power demand monitoring method capable of supporting voluntary power saving efforts by consumers.

The present invention is not limited to the above embodiment. For example, the arbitrary target value 18b is input in step S2 of FIG. 3, but instead, the ratio of the arbitrary target value 18b to the contract target value 18a may be input. That is, if [80%] is input in this step, a value that is 20% less than the contract target value 18a may be set as the value of the arbitrary target value 18b.
In the embodiment, the cutoff control is performed when the predicted value is equal to or greater than the contract target value 18a. However, the cutoff control may be performed even when the predicted value is equal to or greater than the arbitrary target value 18b.

  Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 100 ... Electric power demand monitoring apparatus, 21-2m ... Local control server (LCS), 400 ... LAN, 200 ... Large screen monitor, 300 ... Electric power meter, 11 ... Setting part, 12 ... Input part, 13 ... Electric power consumption calculation part , 14 ... Predicting unit, 15 ... Determination unit, 16 ... Alarm output unit, 17 ... Blocking unit, 18 ... Storage unit, 19 ... Changing unit, MC ... Monitor controller, M ... Monitor

Claims (6)

A prediction unit that calculates a predicted value of power demand in the consumer based on the amount of power measured by a power meter that individually measures the amount of power used by a plurality of loads provided to the consumer of power;
A determination unit that determines whether or not the predicted value exceeds a contract target value based on a contract between the power supplier and the consumer;
An output unit that outputs an alarm when it is determined by the determination unit that the predicted value exceeds the contract target value;
A setting unit for setting an arbitrary target value different from the contract target value;
The determination unit
Determining whether the predicted value exceeds the arbitrary target value;
The output unit is
The power demand monitoring apparatus that outputs the alarm when the determination unit determines that the predicted value exceeds the arbitrary target value.   The power demand monitoring apparatus according to claim 1, further comprising a changing unit that changes the arbitrary target value according to at least one of a season, a day of the week, and a time zone.   Furthermore, when it is determined that the predicted value exceeds any one of the contract target value and the arbitrary target value, a control unit is provided that stops a part of the operating load based on a predetermined order. The power demand monitoring apparatus according to any one of claims 1 and 2. In a power demand monitoring method executed by an apparatus for monitoring power demand,
Based on the amount of power measured by a power meter that individually measures the amount of power used by a plurality of loads provided to a consumer of power, the device calculates a predicted value of power demand at the consumer,
The device determines whether the predicted value exceeds a contract target value based on a contract between the power supplier and the consumer;
When it is determined that the predicted value exceeds the contract target value, the device outputs an alarm,
The determination is as follows.
The device determines whether the predicted value exceeds an arbitrary target value different from the contract target value;
The output is
The power demand monitoring method, wherein when it is determined that the predicted value exceeds the arbitrary target value, the device outputs the alarm.   Furthermore, the power demand monitoring method according to claim 4, wherein the device changes the arbitrary target value in accordance with at least one of a season, a day of the week, and a time zone.   Furthermore, when it is determined that the predicted value exceeds one of the contract target value and the arbitrary target value, the apparatus stops a part of the operating load based on a predetermined order. The power demand monitoring method according to any one of 4 and 5.

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