JP2004328940A - Energy monitor control process, energy monitor control system and energy monitor controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the accuracy of demand control for contract demand power in an energy monitor control process, energy monitor control, and energy monitor controller for performing measurement monitor and demand control for the power usage of a load such as electrical equipment installed at a plant or the like. <P>SOLUTION: A measuring function unit 3 measures the electrical energy consumption of a plurality of loads 7, 7, respectively, and a demand control function unit 2 predicts a used electrical energy amount upon the end of a time limit from the electrical energy consumption at predetermined time intervals from the start of the time limit and the respectively measured present electrical energy consumption of the plurality of loads. At least one of the plurality of the loads 7, 7 is controlled so that predicted electrical energy is within a predetermined contract value. By this constitution, a demand controller and a measuring apparatus are individually operated, and the demand controller predicts demand power from a tendency value of a measured pulse from WHM, thus solving problems such as low precision in demand control due to asynchronous operation in time between the prediction and load control. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an energy monitoring control system, an energy monitoring control system, and an energy monitoring control device for measuring and monitoring the power consumption of a load such as electrical equipment installed in a factory and controlling demand.
[0002]
[Prior art]
As a conventional energy monitoring control device, for example, as described in Patent Literature 1 below, a measurement device and a demand control device are provided in one device, and a CPU of the measurement device and a CPU of the demand control device are provided. The measurement device controls the measurement function exclusively, the demand control device controls the demand control function, and the measurement device and the demand control device operate independently of each other. There is something to do.
[0003]
Further, as a conventional demand control device, for example, as described in Patent Document 2 below, in the middle of a time period, predicting the demand power at the end of the time period, and when it is predicted that the demand contract will be exceeded, There is an apparatus that cuts off power supply to some of the plurality of loads in accordance with a preset power supply cutoff order.
[0004]
[Patent Document 1]
Utility Model Registration No. 3091715 (FIG. 1, paragraphs 0003 to 0006)
[Patent Document 2]
JP-A-11-215700 (FIGS. 1 to 5, paragraph numbers 0014 to 0019)
[0005]
[Problems to be solved by the invention]
In the conventional energy monitoring device, the measuring device and the demand control device operate independently.The measuring device individually measures the electrical specifications of the load equipment, and the demand control device only monitors and controls the entire demand power amount. Demand power prediction at the end of the time period is performed from the tendency value of the measurement pulse from the watt hour meter WHM, and the power prediction depending on the measurement pulse from the watt hour meter WHM and the load control are temporally asynchronous. Therefore, the accuracy of the demand control was not good.
[0006]
In addition, the order and capacity of the load to be interrupted for demand control are set and operated, but the setting is performed in advance based on assumptions based on the experience of maintenance personnel, or based on past average values, etc. As a result, load shedding for demand control is performed at a value different from the actual power consumption of the load to be cut off at the current time. In other words, there was a problem that the load was excessively interrupted and the accuracy of load control for demand control was poor.
[0007]
The present invention has been made in view of the above-described conventional situation, and has as its object to improve the accuracy of demand control with respect to contract demand power.
[0008]
[Means for Solving the Problems]
The energy monitoring control method according to the present invention measures the power consumption of each of the plurality of loads by the measurement function unit, and also calculates the power consumption from the start of the time period in the predetermined time period and the current power consumption of the measured plurality of loads. From this, the power consumption at the end of the time period is predicted by the demand control function unit, and at least one of the plurality of loads is controlled so that the predicted power consumption falls within a preset contract value.
[0009]
Further, the energy monitoring control system according to the present invention measures a power consumption of a plurality of loads and outputs a digital amount based on A / D conversion as a digital function. From the current power consumption of each of the plurality of loads obtained from the output of the measurement function unit, the power consumption at the end of the time period is predicted, and the load of the plurality of loads is set so that the predicted power amount falls within a preset contract value. It has a demand control function unit that outputs a control command to at least one.
[0010]
Further, the energy monitoring and control device according to the present invention includes a plurality of power consumptions measured from a start of a time period in a predetermined time period and a plurality of power amounts measured by the measurement function unit and output as digital amounts based on A / D conversion in the measurement function unit. A power command at the end of the time period is predicted from the current power consumption of the load and a control command for controlling at least one of the plurality of loads is output so that the predicted power falls within a preset contract value. Is what you do.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 is a configuration diagram illustrating an example of a system configuration of an energy monitoring control system, FIG. 2 is an external perspective view illustrating an example of an external appearance of an energy monitoring control device, FIG. 3 is a diagram illustrating a demand adjustment function, and FIG. FIG. 5 is an operation flow diagram for explaining an example of the operation of the system mainly with the demand control function unit.
[0012]
1 and 2, the energy monitoring and control system 1 is a unitized demand control function unit 2, a unitized measurement function unit 3, a unitized communication control function unit 4, and a unitized unit. And a power supply function unit 5.
[0013]
The demand control function unit 2 includes, for example, a transmitter that transmits the amount of power used by a plurality of loads a to n7 that are supplied via switching means 6 such as a circuit breaker in a factory or the like by a pulse signal. The pulse signal is supplied from a transmitter-equipped WHM (watt hour meter) 8 having
[0014]
The measurement function unit 3 inputs each load current of the plurality of loads a to n7 from an output of a current sensor 9 such as a CT (current transformer), and calculates a voltage at an input terminal of the plurality of loads a to n7. , PT (instrument transformer) and the like from the output of the voltage sensor 10.
[0015]
The communication control function unit 4 is connected to a remote monitoring control terminal 12 such as a personal computer via a network 11 such as the Internet, an intranet, an extranet, a WAN, a LAN, and the like. ing.
[0016]
The power supply function unit 5 uses an alternating current (commercial power supply) 13 as an input power supply, and a power supply unit 51 operates power supply of each function unit (the demand control function unit 2, the measurement function unit 3, and the communication control function unit 4). And power is supplied to the demand control function unit 2, the measurement function unit 3, and the communication control function unit 4 via a power supply line 14.
[0017]
The demand control function unit 2, the measurement function unit 3, and the communication control function unit 4 are interconnected via a communication line 15.
[0018]
Further, as shown in FIG. 2, the demand control function unit 2, the measurement function unit 3, the communication control function unit 4, and the power supply function unit 5 are unitized as shown in FIG. And the like. Further, the demand control function unit 2, the measurement function unit 3, the communication control function unit 4, and the power supply function unit 5, which are unitized, are respectively arranged along the support member 16 as shown in FIG. The male and female connectors 2C, 3C, 4C, 5C are provided on both sides 2S1, 2S2, 3S1, 3S2, 4S1, 4S2, 5S1, 5S2 orthogonal to the moving direction. The function unit 2, the measurement function unit 3, the communication control function unit 4, and the power supply function unit 5 are moved along the support member 16, and the unitized function units 2, 3, 4, and 5 are moved to the respective units. The demand control function unit 2, the measurement function unit 3, the communication control function unit 4, which is unitized by stacking and combining so that the male and female connection connectors 2 C, 3 C, 4 C, and 5 C are inserted and connected, Fine power function unit 5, as shown in FIG. 1, the power supply line 14 are connected to each other by a communication line 15.
[0019]
In FIG. 2, the male and female connectors 5C, 5C of the surfaces 5S1, 5S2 on both sides perpendicular to the moving direction along the support member 16 are shown for the unitized power supply function unit 5, The unitized demand control function unit 2, measurement function unit 3, and communication control function unit 4 have surfaces 2S1, 2S2 orthogonal to the moving direction along the support member 16 for simplification of the drawing. , 3S1, 3S2, 4S1, 4S2, 5S1, 5S2, only the connectors 2C, 3C, 4C on one side 2S2, 3S2, 4S2 are shown, and the connectors on the other side 2S1, 3S1, 4S1 are The illustration is omitted.
[0020]
Hereinafter, an internal configuration and main functions of the demand control function unit 2, the measurement function unit 3, and the communication control function unit 4 will be described.
[0021]
The demand control function unit 2, the measurement function unit 3, and the communication control function unit 4 have CPUs 21, 31, and 41, respectively, and perform message / data communication between the function units 2, 3, and 4. Are mutually possible. As this communication means, for example, a CAN (Controller Area Network) bus held by the CPU is used. In addition, since the measurement function unit 3 has an upper limit on the number of measurement points, a plurality of unitized measurement function units of the same type are stacked to cope with an increase in the number of measurement points.
[0022]
The demand control function section 2 includes the CPU 21, a pulse input section 22, a time limit generation section 23, a pulse integration section 24, a demand prediction section 25, and an opening / closing control section 26. A pulse transmitted in proportion to the electric energy from an electric energy meter (WHM) 8 that measures the electric energy of the controlled load 7 is received from the pulse input unit 22 and a predetermined time period ( Every 30 minutes, for example), the demand power is measured by integrating the pulses in the integrating unit 24. The demand prediction unit 25 calculates the demand power at the end of the time period from the remaining time up to the time period and the current power consumption in order to monitor and control the demand power in the predetermined time period so as not to exceed the contract demand power contracted with the power company. A prediction operation is performed, a part of the controlled load 7 is selected as necessary, and an opening / closing command to the switching means 6 corresponding to the selected controlled load 7 is output from the switching control unit 26. In addition, the demand control function unit 2 can be said to be an energy monitoring and control device from the above-mentioned functions.
[0023]
The measurement function unit 3 includes a CPU 31 and a measurement unit 32. The voltage, current, and power consumption of each branch of the controlled load 7 can be individually A / D-converted and measured by the current sensor 9 and the sensing value of the voltage sensor 10 by the measuring unit 32. Each measurement value is transmitted to the demand control function unit 2 as a digital signal using the communication means. The measurement unit 32 cyclically executes the measurement of each branch of the controlled load 7 every several seconds. Further, the respective opening / closing means 6 in each branch of the controlled load 7 is individually opened / closed by an opening / closing command from the opening / closing control unit 26.
[0024]
The communication control function unit 4 includes a communication control CPU 41, a collected data storage memory 42, and an external communication I / F (interface) 43. The communication control CPU 41 includes a current, a voltage, an instantaneous power, a past demand power value, and a current demand value of each branch collected by communication with other CPUs (the CPU 31 of the measurement function unit 3 and the CPU 21 of the demand control function unit 2). Data such as power values and demand predictions are recorded and stored in the collected data storage memory 42 in time series. In response to a request from the remote monitoring terminal 6 connected to the network 11 via the external communication I / F (interface) 43, measurement and monitoring of voltage, current, power, etc. for each load, In addition, retrieval of past data stored in the collected data storage memory 42 is enabled.
[0025]
Next, the operation will be described with reference to FIGS. First, the operation concept will be described with reference to FIG. 3, and then the operation will be described in detail with reference to FIG.
[0026]
In FIG. 3, in the middle of a predetermined time period (for example, 30 minutes) (current time point tn), based on the power consumption (current demand power) Pn from the start of the time period, the current time Tm until the end of the time period is reached. The predicted demand power Pf is calculated assuming that the power consumption at the time is continued. The predicted demand power Pf and the contract demand power Pc are compared, and when the contract demand power Pc <the predicted demand power Pf, a plurality of control target loads are set such that the contract demand power Pc> the predicted demand power Pf. 7 (FIG. 1), an adjustable load is selected, and the load is cut off or the load is reduced.
[0027]
Next, the operation of the demand control function section 2 will be mainly described in detail along the operation flow of FIG. 4 and with reference to FIGS.
[0028]
When the time period is started by the time period generation unit 23 (see FIG. 1), the output pulse of the watt hour meter WHM8 (see FIG. 1) from the transmitter is output from the demand control function unit 2 from the start of the time period (see FIG. 3). The accumulation is started by the accumulator 24 (see FIG. 1), and the current demand power Pn is constantly grasped by the pulse accumulation (step ST1).
[0029]
After the start of the time period, it is determined whether the time period has ended (step ST2). If the time period has not ended, the process proceeds to step ST3.
[0030]
In step ST3, at a predetermined time (the current time tn in FIG. 3) from the start of the time period, the demand forecasting unit 25 (see FIG. 1) calculates the predicted demand power Pf by the following equation: Pf = current demand power value Pn + (remaining time Tm × Σ). (Measured power value) is calculated.
[0031]
In the equation for calculating the predicted demand power Pf, the current demand power value Pn is a demand power value based on the pulse total at the current time point tn shown in FIG. The remaining time Tm is a time from the current time tn to the end of the time period as shown in FIG. The measured power value is the sum of the power consumption values of the loads 7, 7,... (See FIG. 1) to be monitored and controlled by the demand control function unit 2 at the current time point tn. Each load calculated by the unit 3 (see FIG. 1) from the A / D converted value of the load current and the A / D converted value of the load voltage of each of the loads 7, 7,. Is the sum of the power consumption values. Here, the current demand power value Pn is a cumulative value at the current time point tn of the output pulse of the watt-hour meter WHM8 (pulse generated depending on the rotation of the induction disk of the watt-hour meter WHM8). It is. On the other hand, the Σmeasured power value is the instantaneous power consumption value of each load 7, 7,... At the current time tn (the actual power consumption of each load 7, 7,. Value), and not the power consumption value estimated from the cumulative value at the current time point tn of the output pulse of the watt-hour meter WHM8 as in the related art. In other words, the calculation standard of the predicted demand power Pf is the current instantaneous power consumption, and the instantaneous power consumption is measured in analog amounts separately for the loads 7, 7,. Based on the instantaneous current and the instantaneous voltage input to each of the loads, the result measured by the measuring unit 32 for each load is grasped as a numerical value of a digital amount, and is used by the demand control function unit 2.
[0032]
The predicted demand power Pf calculated in step ST3 is compared with the contract demand power Pc (see FIG. 3), and it is determined whether or not the contract demand power Pc <the predicted demand power Pf (step ST4).
[0033]
In step ST4, the predicted demand power Pf is compared with the contract demand power Pc. If the result is that the contract demand power Pc <the predicted demand power Pf, the instantaneous power consumption value of each of the loads 7, 7,. , A simulation operation for selectively cutting off the load that can be cut off among the loads 7, 7,... Is performed (step ST5).
[0034]
An example of the simulation operation in the step ST5 is, for example, as shown in FIG.
Calculated value S1 = Pf−remaining time Tm × (priority 1 load measured power value),
Calculated value S2 = Pf−remaining time Tm × (priority 2 load measured power value),
Calculated value S3 = Pf−remaining time Tm × (priority 1 + priority 2 load measured power value),
Calculated value S4 = Pf−remaining time Tm × (priority 1 + priority 3 load measured power value),
Calculated value S5 = Pf−remaining time Tm × (priority 2 + priority 3 load measured power value),
Then, a simulation operation is performed on the calculated values S6, S7,... As necessary.
[0035]
In the simulation calculation example, Pf is the predicted demand power (see FIG. 3). The priority one load measured power value is an instantaneous power consumption value of a load having the least effect even if the load is interrupted. The priority 2 load measured power value is the instantaneous power consumption value of the load having the least influence next to the priority 1 load even if the load is interrupted. The priority 3 load measured power value is an instantaneous power consumption value of the load having the least influence after the priority 1 load even if the load is interrupted.
[0036]
Next, the case where the simulation calculation result in the step ST5 is within the contract demand power Pc and is closest to the contract demand power Pc is selected (step ST6), and the corresponding load 7 in the case is cut off. (Step ST7), the opening / closing means 6 (see FIG. 1) of the load 7 is opened by the command signal, and the load 7 is cut off (disconnected from the power supply system).
[0037]
The loads to be subjected to the simulation calculation are grouped into a load group that has little effect even if the load is interrupted and a load group that does not affect the load among the loads 7, 7,. The groups of the load groups having little influence are set in advance as power adjustment targets, and among the set groups, priority 1 load, priority 2 load, priority 3 load,.・ ・ Set From among the set groups, when each load is cut off, the adjustment power for reducing the predicted demand power to the contract demand power or less is calculated from the instantaneous power consumption value of each load by performing the simulation calculation in the step ST5 to perform the cutoff. The load is selected in consideration of the priority. Specifically, as shown in the calculation example in step ST5, the predicted demand power (cumulative power consumption) at the end of the time period is simulated and predicted by a combination of interruption of each load in the group, The closest case which does not exceed the contract demand power is selected, and the power adjustment load shedding is executed.
[0038]
The method of setting the priority 1 load, the priority 2 load, the priority 3 load,... In the group of the load groups having little influence even if the load is interrupted is a method of artificially setting the load, A method of setting in consideration of the operation history (power consumption history) immediately before each load in the load group of the load group that has little effect even if the load is cut off, There is a method of setting cyclically when there is no difference between the priorities of the loads in the group, and the like.
[0039]
Next, when the comparison result between the predicted demand power Pf and the contract demand power Pc in the step ST4 indicates that the contract demand power Pc> the prediction demand power Pf, there is a margin between the contract demand power Pc and the predicted demand power Pf. It is determined whether there is a predetermined value or more (step ST8).
[0040]
As a result of the determination in the step ST8, when the margin between the contract demand power Pc and the predicted demand power Pf is equal to or more than a predetermined value, it is determined whether or not the load has been interrupted for the power adjustment within the same time period (step ST9). ).
[0041]
If the result of determination in step ST9 is that there is a load shedding for the power adjustment within the same time period, the power value at the time of breaking the load interrupted within the same time period is searched (step ST10).
[0042]
Next, a simulation operation is performed using the shut-off power value searched in step ST10 so as to select a load that fills a margin between the contract demand power Pc and the predicted demand power Pf (step ST11). ).
[0043]
An example of the simulation operation in step ST11 is, for example, as shown in FIG.
S1 = current demand power Pn + (remaining time Tm × interruption load 1 power value)
S2 = current demand power Pn + (remaining time Tm × interruption load 2 power value)
Then, a simulation operation is performed on the calculated values S6, S7,... As necessary.
[0044]
In the simulation calculation example, the power value of the interrupted load 1 is the power value of the load 1 interrupted for the power adjustment within the same time period, and the power value of the interrupted load 2 is the power value of the interrupted load 2 within the same time period. This is the power value at the time of interruption of the load 2 interrupted for adjustment.
[0045]
Next, the case where the simulation calculation result in step ST11 is within the contract demand power Pc and is closest to the contract demand power Pc is selected (step ST12), and the corresponding load 7 in the case is input. (Step ST13), the switching means 6 (see FIG. 1) for the corresponding load is turned on by the command signal, and the load 7 is turned on (connection to the power supply system).
[0046]
For example, when the load with the lower priority order is stopped for your own convenience after the demand power adjustment, in the next predicted demand power calculation, a state may occur in which the forecast is significantly lower than the contract demand power, In such a case, the above-mentioned state can be solved by returning the power of the adjusted load cut off immediately before within the same time period and having a power value not exceeding the contract demand power Pc in steps ST8 to ST13 described above. . The load number cut off for power adjustment immediately before and the instantaneous power consumption value at that time are stored in the collected data storage memory 42. During the operations in steps ST8 to ST13 described above, the stored data in the collected data storage memory 42 is stored. Use
[0047]
It should be noted that as a result of the determination in the step ST9, if there is no load shedding for the power adjustment within the same time period, and that the result of the determination in the step ST8 has a margin between the contract demand power Pc and the predicted demand power Pf. If not, the process returns to step ST1.
[0048]
In step ST2, when the time period ends, the output and display of the demand power value are reset (step ST14), and the process returns to step ST1.
[0049]
Thereafter, the above-described operations of steps ST1 to ST14 are repeatedly performed.
[0050]
According to the first embodiment of the present invention, as described above, each power consumption of the plurality of loads 7, 7,... Is measured by the measurement function unit 3, and at the same time a predetermined time period (current time point tn) starts from the time period start. The demand control function unit 2 predicts the power consumption Pf at the end of the time period from the power consumption Pn and the current power consumption (current time tn) of the plurality of measured loads, and the predicted power consumption is set in advance. Are controlled so as to fall within the contracted value Pc. The energy monitoring and control method controls at least one of the plurality of loads 7, 7,. Demand power adjustment can be performed with high accuracy.
[0051]
Also, as described above, the first embodiment of the present invention measures the power consumption of a plurality of loads 7, 7,..., And outputs a digital amount based on A / D conversion, and a measurement function unit 3, The power consumption Pf at the end of the time period is predicted from the power consumption amount Pn from the start of the time period and the current power consumption of a plurality of loads obtained from the output of the measurement function unit 3 at a predetermined time period (current time point tn). An energy monitoring control system 1 including a demand control function unit 2 that outputs a control command for at least one of the plurality of loads 7, 7,... So that the predicted power amount Pf falls within a preset contract value Pc. Therefore, it is possible to provide an energy monitoring control system capable of performing accurate demand power adjustment.
[0052]
As described above, the first embodiment of the present invention simulates each combination of the measured power values based on the current measured power values of the plurality of loads 7, 7,... The energy monitoring control system 1 performs a prediction calculation, selects a load whose power consumption at the end of the time period is closest to the contract value Pc, and outputs a control command for the load. This makes it possible to perform more accurate demand power adjustment.
[0053]
Further, in the first embodiment of the present invention, as described above, the measurement function unit 3 and the demand control function unit 2 are unitized, and the power supply lines of the measurement function unit 3 and the demand control function unit 2 are provided. Since the energy monitoring and control system 1 is provided in the measurement function unit 3 and the demand control function unit 2 in which the connection connectors 2C and 3C for interconnecting the communication line 14 and the communication line 15 are unitized, the system scale can be increased or decreased. .
[0054]
Also, as described above, the first embodiment of the present invention uses the power consumption Pn from the start of the time period in the predetermined time period and the digital power measured by the measurement function unit 3 and based on the A / D conversion in the measurement function unit 3. The power consumption Pf at the end of the time period is predicted from the current power consumption of the plurality of loads 7, 7,... Output as the power, and the predicted power Pf falls within a preset contract value Pc. Since the energy monitoring and control device 2 outputs a control command for controlling at least one of the plurality of loads 7, 7,..., For example, an existing measurement function unit 3 for another use is used. Thus, the energy monitoring and control device 2 capable of performing accurate demand power adjustment can be installed.
[0055]
Embodiment 2 FIG.
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a configuration diagram illustrating an example of a system configuration of the energy monitoring and control system, and FIG. 6 is an operation flowchart illustrating an example of an operation of the system of FIG. 5 mainly by a demand control function unit. In FIGS. 5 and 6, the same or corresponding parts as those in FIGS. 1 and 4 are denoted by the same reference numerals as those in FIGS. 1 and 4, and the configuration and operation are the same as those in FIGS. 4 will be described, and description of the same or corresponding portions as those in FIGS. 1 and 4 will be omitted.
[0056]
As shown in FIG. 5, a load 7a controlled by the monitoring control terminal device 12a such as a programmable controller may be connected to the demand control target loads 7, 7,. Embodiment 2 of the present invention exemplifies an example of an embodiment in the case where loads 7a controlled by the monitoring control terminal devices 12a such as such programmable controllers are mixedly connected.
[0057]
More specifically, in the second embodiment of the present invention, as shown in FIG. 5, a monitoring control terminal device 12a such as a programmable controller is connected to a demand control function via a network 11 and a communication control function unit 4. The load 7a is connected to the unit 2 so as to be able to communicate information, and the load 7a is a system capable of switching from the demand control function unit 2 to the energy saving mode operation / thinning operation through the monitoring control terminal device 12a and switching the load. The operation state identification of whether the operation state of the load 7a is the full load operation or the energy saving mode operation and the measured instantaneous power consumption of the load 7a are transmitted from the monitoring control terminal device 12a to the communication control function unit 4, and the collected data accumulation memory Are recorded together with the instantaneous power consumption measured values of the other loads 7, 7,.
[0058]
Next, the operation of the portion different from the above-described operation flow of FIG. 4 will be mainly described in detail along the operation flow of FIG. 6 and with reference to FIG.
[0059]
The process up to the calculation of the demand power in the middle of the predetermined time period to determine the necessity of power adjustment is the same as that of the first embodiment of the present invention.
[0060]
Hereinafter, the operation will be described assuming that the load 7a (see FIG. 5) is the earliest order of the power adjustment control targets in the cyclic order setting or the like. When the calculation result of the predicted demand power Pf in step ST3 is determined in step ST4 to be contract demand power Pc <predicted demand power Pf and power adjustment is necessary, first, the power adjustment control target load in the earliest order is used. It is determined whether 1 is the load 7a in the energy saving mode (step ST15).
[0061]
When it is determined in step ST15 that the load 1 to be subjected to the power adjustment control in the earliest order is the load 7a in the energy saving mode, it is determined whether the load 7a in the energy saving mode is operating in the energy saving mode (step ST16). .
[0062]
If it is determined in step ST16 that the vehicle is not operating in the energy saving mode, the instantaneous power consumption value in the previous energy saving mode stored in the collected data storage memory 42 or each instantaneous power consumption value in the previous energy saving mode is stored. The power consumption value is searched and extracted (step ST17).
[0063]
Next, using the instantaneous power consumption values in the energy saving mode extracted in step ST17, the instantaneous power consumption value of the load 7a to be operated in the energy saving mode and the loads 7, 7,. .. For selectively cutting or reducing the load that can be cut off or the load that can be reduced among the loads 7, 7,... So that the sum with the instantaneous power consumption value is within the contract demand power Pc. A calculation operation is performed (step ST18).
[0064]
An example of the simulation operation in the step ST18 is, for example, as shown in FIG.
Calculated value S1 = Pf−remaining time Tm × (load 1 energy saving mode measured power value difference),
Calculated value S2 = Pf−remaining time Tm × (priority 2 load measured power value),
Calculated value S3 = Pf-remaining time Tm * (load 1 energy saving mode measured power value difference + load 2 measured power value),
.., And a simulation operation is performed on the calculated values S4, S5,... As necessary.
[0065]
In the simulation calculation example, the difference between the measured power value of the load 1 in the energy saving mode and the instantaneous power consumption value of the load 7a in the energy saving mode during the energy saving mode operation. This is the difference from the power consumption value.
[0066]
Next, in step ST6, the case where the result of the simulation calculation in step ST18 is within the contract demand power Pc and the case closest to the contract demand power Pc is selected, and the load of the combination in the case is cut off or energy is saved. Select the mode operation.
[0067]
When the load for which the cutoff or the energy saving mode operation is selected in step ST6 is controlled by the monitoring control terminal device 12a (see FIG. 5), the demand control function unit 2 (see FIG. 5) transmits the communication control function unit 4 (see FIG. 5). 5), the monitoring and control terminal device 12a is instructed via the network 11 (see FIG. 5) to execute the load cutoff / energy saving mode operation of the combination in the selected case (step ST19).
[0068]
By transmitting this load control command to the monitoring and control terminal device 12a, it is announced that the load control command has been input to the monitoring and control terminal device 12a. Based on this notice, the power user or the automatic control function of the monitoring and control terminal device 12a determines whether the interruption or the energy saving mode operation can be permitted depending on the load condition (step ST20).
[0069]
As a result of the determination in step ST20, if the load control command in step ST19 is not accepted, the process returns to step ST15, and the operations in steps ST15 to ST19 are performed. It repeats within a predetermined time limit until it is accepted in ST20.
[0070]
As a result of the determination in step ST15, when the load 1 to be subjected to the power adjustment control in the earliest order is not the load 7a in the energy saving mode, and as a result of the determination in step ST16, the load 7a in the energy saving mode is operating in the energy saving mode. In the case of step ST5, the process proceeds to step ST5. After performing the same operation as that of the first embodiment of the present invention in step ST5, the process proceeds to step ST6, and the operation of step ST6 → step ST19 → step ST20 is performed as described above. I do. If the determination result in step ST4 is that contract demand power Pc> predicted demand power Pf, operations in steps ST8 to ST13 are performed as in the case of the first embodiment of the present invention described above.
[0071]
In the second embodiment of the present invention, as described above, in addition to directly controlling the load from the demand control function unit 2 and performing demand monitoring control, monitoring and demand control through another monitoring control terminal device 12a that controls the load are performed. And become possible.
[0072]
Embodiment 3 FIG.
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. 7 showing an example of a system configuration of an energy monitoring control system. In FIG. 7, the same or corresponding parts as those in FIGS. 1 and 5 are denoted by the same reference numerals as those in FIGS. 1 and 5, and the configuration and operation are different from those in FIGS. This point will be described, and the description of the same or corresponding portions as those in FIGS. 1 and 5 will be omitted.
[0073]
In the third embodiment of the present invention, as shown in FIG. 7, the demand control function unit 2 has the function of controlling the load 7a to be operated in the energy saving mode according to the second embodiment of the present invention. Then, the operations of steps ST1 to ST20 in the first and second embodiments of the present invention are performed by the demand control function unit 2.
[0074]
Therefore, according to the third embodiment of the present invention, the demand monitoring control for each of the loads 7a, 7, 7,... The function can be performed by the demand control function unit 2 without providing the function in the monitoring control terminal device 12.
[0075]
FIG. 2 illustrates an example in which each of the demand control function unit 2, the measurement function unit 3, the communication control function unit 4, and the power supply function unit 5 is unitized, but the measurement function unit 3, the communication control function unit At least one of the power control unit 4 and the power supply function unit 5 may be provided in the demand control function unit 2.
[0076]
【The invention's effect】
As described above, the present invention measures the power consumption of each of the plurality of loads by the measurement function unit, and calculates the power consumption from the start of the time period in the predetermined time period and the current power consumption of the measured plurality of loads. The demand control function unit predicts the power consumption at the end of the time period, and uses an energy monitoring control method of controlling at least one of the plurality of loads so that the predicted power falls within a preset contract value. Since the demand power is adjusted using the current power consumption of the load, there is an effect that the demand power can be adjusted with high accuracy.
[0077]
In addition, as described above, the present invention measures a power consumption of a plurality of loads and outputs it as a digital amount based on A / D conversion, a power consumption from a start of a time period in a predetermined time period, and the measurement function. The power consumption at the end of the time period is predicted from the current power consumption of each of the plurality of loads obtained from the output of the unit, and at least one of the plurality of loads is set such that the predicted power amount falls within a preset contract value. Since the energy monitoring control system includes a demand control function unit that outputs a control command to the energy monitoring control system, it is possible to provide an energy monitoring control system capable of performing accurate demand power adjustment.
[0078]
In addition, as described above, the present invention relates to the power consumption from a start of a time period in a predetermined time period and a plurality of loads measured by a measurement function unit and output as digital amounts based on A / D conversion in the measurement function unit. Energy that outputs a control command for controlling at least one of the plurality of loads so as to predict the power consumption at the end of the time period from the current power consumption and the predicted power consumption to be within a preset contract value. Since the monitoring control device is used, for example, there is an effect that an energy monitoring control device capable of performing accurate demand power adjustment using an existing measurement function unit for another use can be installed.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a configuration diagram illustrating an example of a system configuration of an energy monitoring control system.
FIG. 2 is a view showing the first embodiment of the present invention, and is an external perspective view showing an example of the external appearance of the energy monitoring control device.
FIG. 3 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating an example of a demand adjustment function.
FIG. 4 is a diagram showing the first embodiment of the present invention, and is an operation flow diagram for explaining an example of the operation of the system of FIG. 1 mainly by a demand control function unit;
FIG. 5 is a diagram illustrating a second embodiment of the present invention, and is a configuration diagram illustrating an example of a system configuration of an energy monitoring and control system.
6 is a diagram showing the second embodiment of the present invention, and is an operation flow diagram for explaining an example of the operation of the system of FIG. 5 mainly by a demand control function unit; FIG.
FIG. 7 is a diagram illustrating a third embodiment of the present invention, and is a configuration diagram illustrating an example of a system configuration of an energy monitoring and control system.
[Explanation of symbols]
1 Energy monitoring and control system 2 Demand control function section
2C connector, 3 measurement function part,
3C connector, 4 communication control function,
4C connector, 5 power supply function,
5C connector, 6 opening and closing means,
7 load, 7a energy-saving mode operable load,
8 Watt hour meter (WHM), 11 network,
12 remote monitoring and control terminal equipment,
12a remote monitoring control terminal equipment capable of load control,
21 CPU, 22 pulse input unit,
23 time period generator, 24 pulse accumulator,
25 demand prediction unit, 31 CPU,
32 measuring unit, 41 communication control CPU,
42 collected data storage memory, 43 external communication interface.

Claims (10)

The power consumption of each of the plurality of loads is measured by the measurement function unit, and the power consumption at the end of the time period is determined from the power consumption amount from the start of the time period in the predetermined time period and the current power consumption of the measured plurality of loads. An energy monitoring control method in which a demand control function unit predicts and controls at least one of the plurality of loads so that the predicted electric energy falls within a preset contract value. A measurement function unit that measures each power consumption of a plurality of loads and outputs the measured amount as a digital amount based on A / D conversion, and a plurality of loads obtained from the power consumption amount from a start of the time period in a predetermined time period and the output of the measurement function unit A demand control function unit that predicts the power consumption at the end of the time period from the current power consumption and outputs a control command for at least one of the plurality of loads so that the predicted power consumption falls within a preset contract value. Energy monitoring and control system with. 3. The energy monitoring and control system according to claim 2, wherein a simulation prediction operation is performed for each combination of the measured power values based on the current measured power values of the plurality of loads in the upper order of the control target, and the power consumption at the end of the time period. An energy monitoring and control system, wherein a load whose amount is closest to the contract value is selected and a control command for the load is output. 3. The energy monitoring and control system according to claim 2, further comprising: a collected data storage unit that records the measured power value in a time series with the identification of an operation state of the load in an energy saving mode, the energy saving mode recorded in the collected data storage unit. An energy monitoring and control system, wherein a power value is used for a simulation prediction calculation, a load closest to a preset contract value is selected, and a control command for the load is output. The energy monitoring and control system according to any one of claims 2 to 4, wherein the measurement function unit and the demand control function unit are unitized, and each power line and the communication of the measurement function unit and the demand control function unit. An energy monitoring and control system, wherein connection connectors for connecting wires to each other are provided in the unitized measurement function unit and demand control function unit. The energy monitoring control system according to any one of claims 2 to 5, further comprising a communication control function unit that connects the demand control function unit and the remote monitoring control terminal, wherein the predicted power amount is a preset contract value. An energy monitoring and control system, wherein a load control command is output from the remote monitoring and control terminal so as to enter. At the end of the time period from the power consumption amount from the start of the time period in the predetermined time period and the current power consumption of a plurality of loads measured by the measurement function unit and output as digital amounts based on A / D conversion in the measurement function unit An energy monitoring and control device for estimating the amount of power used and outputting a control command for controlling at least one of the plurality of loads so that the estimated amount of power falls within a preset contract value. The energy monitoring and control device according to claim 7, wherein a simulation prediction operation is performed for each combination of the measured power values based on the current measured power values of a plurality of loads in a higher order of a control target, and the power consumption at the end of the time period. An energy monitoring and control device, wherein a load whose amount is closest to the contract value is selected and a control command for the load is output. 8. The energy monitoring and control device according to claim 7, further comprising: a collected data storage unit that records the measured power value in a time series with the identification of an operation state of the load in an energy saving mode, the energy saving mode recorded in the collected data storage unit. An energy monitoring and control device, wherein a power value is used for a simulation prediction calculation, a load closest to a preset contract value is selected, and a control command for the load is output. The energy monitoring and control device according to claim 7, further comprising a communication control function unit for connecting the remote monitoring and control terminal to the remote monitoring and control terminal, wherein the predicted power amount is set to a predetermined contract value from the remote monitoring and control terminal. An energy monitoring control device, wherein a load control command is output.

Images