JP2005086972A - Demand control unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a demand control unit, wherein demand control is carried out on a department-by-department basis for clarifying the responsibility for each department, and to prevent increase in demand in each department, and as a result, a state where maximum demand for the overall customer exceeds the contract demand is prevented. <P>SOLUTION: The demand control unit comprises a demand monitoring device 3 that carries out a total demand control where the overall predicted power will not exceed the overall target power; and a plurality of local demand control units 4, 5, and 6 that carry out a local demand control where the department predicted powers will not exceed the department target powers. The demand control unit is so constituted that the following operation is performed: if the overall predicted power exceeds the overall target power, the demand monitor device 3 causes the local demand control units 4, 5, and 6 to set the respective department target powers to be low, and the power used in the customer's facilities as a whole thereby can be suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention monitors the amount of transaction power in a customer facility and controls the load in a timely manner, and performs demand control (demand prediction control) so that the maximum demand power (demand) of the load per predetermined time does not exceed a predetermined value. The present invention relates to a demand control device.

  Electric charges paid by large consumers who contract with high-voltage power and commercial power include basic charges and electric energy charges. Of these, the basic charges are determined by the maximum demand power (demand). The maximum demand power is measured by a transaction demand meter and an average value (average power) is calculated in units of 30 minutes, and the maximum value in one month is set as the maximum demand power (demand) of the month. Since the basic charge for one year is determined by the maximum power demand, the basic charge can be reduced by lowering the maximum power demand. Therefore, a demand control device that monitors and controls the maximum demand power is installed.

A conventional demand control apparatus will be described with reference to the drawings. FIG. 10 is a block diagram showing an example in which a demand control device according to the prior art is installed in a customer facility.
As a customer facility, for example, it will be described as a facility that supplies power to a load installed in each of departments A, B, and C within a factory site. In such customer facilities, disconnector 101, breaker 102, transformer 103, wiring breaker 104, departmental circuit breaker 105, departmental load 106, current transformer 107, transformer 108, transaction watt-hour meter. 109, a transaction demand meter 110 is provided.
The demand control device includes a current transformer 201, a pulse converter 202, a demand control unit 203, and a monitoring device 204.

In the demand control device, a demand control unit 203 is arranged at a power receiving point of a customer facility. Then, a signal (representing the transaction power amount) sent from the transaction energy meter 109 to the transaction demand meter 110 is input to the pulse converter 202 via the current transformer 201, and the pulse converter 202 converts the signal converted pulse. Is output to the demand control unit 203. Based on this pulse, the demand control unit 203 calculates the current power consumption of the entire facility (hereinafter referred to as current power), and performs measurement and monitoring based on the current power. Specifically, when the predicted power calculated based on the current power is going to exceed or is expected to exceed the target power set lower than the contract power or the contract power, By controlling the load registered in the demand control unit 203 as the control target (all or any of the intra-department loads 106 in the departments A, B, and C), the maximum demand power (demand) is the contract power / target power. Is not to exceed.
Further, as another prior art example of an apparatus that performs similar demand control, for example, a demand control apparatus disclosed in Patent Document 1 is known.

  Further, a method for calculating predicted power in such demand control will be described with reference to the drawings. FIG. 11 is an explanatory diagram of a demand control algorithm. Here, the sampling time interval is denoted by Δt, the power change in the time interval is denoted by Δp, and the remaining time of the demand time period is denoted by ST. Here, the demand time limit is generally set to 30 minutes. The predicted power is expressed by the following calculation formula.

[Equation 1]
Predicted power = current power + (Δp / Δt) × ST

As described above, the predicted power is calculated on the assumption that the power is used with a predetermined gradient (Δp / Δt) thereafter with respect to the current power. In FIG. 11, the current power exceeds the target power line, but even if the current power is below the target power line, if the slope (Δp / Δt) is steep, the predicted power finally becomes the target power. May be exceeded. For this reason, the predicted power and the target power for each demand time period (30 minutes) are compared. Note that the target power is generally set lower than the contract power.
When the predicted power is expected to exceed the target power (or contract power) by the above calculation, control is performed on a predetermined load so that the predicted power does not exceed the target power (or contract power). This prevents the situation where the maximum demand power (demand value) exceeds the contract power.
As another prior art example of an apparatus that performs demand control using such an algorithm, for example, a demand control apparatus disclosed in Patent Document 2 is known.

Japanese Patent Laid-Open No. 2001-186658 (FIG. 2) Japanese Patent Laid-Open No. 9-46901 (FIG. 2)

The conventional demand control apparatus has the following problems (1) to (3).
(1) The load control line cannot be saved.
The demand control device is mainly placed near the power distribution facility of the customer facility, but since the load is in a remote place, the load control line from the demand control device to the load control device (not shown) is long. There was a problem of distance. For example, when a field-level air conditioner, lighting, or the like is used as a load to be controlled, it is necessary to extend the load control line to each floor, and the wiring cannot be saved. Such a problem becomes a significant problem when a demand control device is attached to an existing customer facility. As a result, the control target of the demand control device placed in the center is limited to the common equipment in the facility near the power receiving and distribution equipment, and the load of each department cannot be controlled substantially.

On the other hand, even when the load control line can be wired and the demand of each department is demand-controlled by transmission or the like from the central demand control device, there are the following problems (2) and (3).
(2) Unfairness between sectors for energy conservation.
Even if a specific department in the entire customer facility is managing energy conservation, demand control is performed on the entire facility due to the energy consumption of other departments. There is a problem of holding.

(3) Not suitable for energy management in units of departments.
In demand management based on the received power of the entire customer facility, energy management and energy saving results in each department are not directly linked, so energy management and energy saving improvement and control cannot be performed in each department. These mean that, for example, when the customer is a tenant building or the like, it is not suitable for use in energy management in units of tenants.

  Therefore, the present invention has been made to solve the above-described problems. The purpose of the present invention is to perform demand control separately for each of a plurality of units, clarify the responsibility of each unit, and demand for each unit. An object of the present invention is to provide a demand control device that prevents an increase in electric power and, as a result, prevents a situation in which the maximum demand power of the entire consumer exceeds contract power.

  A control device (hereinafter referred to as local demand control device) that performs local demand control (hereinafter referred to as local demand control) for the load of each unit, and total demand control (hereinafter referred to as total demand) for the entire customer facility A control device (hereinafter referred to as a demand monitoring device) is arranged, energy management for each department is performed by local demand control, and energy management of the entire customer facility is performed by the demand monitoring device. When the demand monitoring device predicts that the maximum demand power of the entire customer facility exceeds the contract power, it instructs the local demand control device of all units to reduce the unit target power allocated to the unit by communication. Then, the local demand control apparatus that has determined that the unit predicted power exceeds the unit target power that has been down is configured to perform output control on the load of the unit in charge.

Such a demand control device according to claim 1 of the present invention includes:
The total predicted power calculated based on the current power of the entire customer facility and the total target power set in advance for the entire customer facility, so that the total predicted power does not exceed the total target power A demand monitoring device that performs demand control;
The unit predicted power does not exceed the unit target power by comparing the unit predicted power calculated based on the current power of the load set by dividing the customer facility by unit with the unit target power preset for each unit. A plurality of local demand control devices that perform local demand control,
With
When the total predicted power exceeds the total target power, the demand monitoring device performs setting to lower the unit target power for each local demand control device, and the unit predicted power exceeds the unit target power after the setting change. Alternatively, the total demand control is performed by suppressing the maximum power demand of the entire customer facility by the local demand control performed by some local demand control devices.

Moreover, the demand control apparatus according to claim 2 of the present invention includes:
The demand control device according to claim 1,
The demand monitoring device includes:
A target power setting unit for performing an operation of setting the overall target power;
A communication unit that communicates with the demand monitoring device and the plurality of local demand control devices via a communication line;
Calculate the total predicted power from the current power of the entire customer facility, and if the total predicted power exceeds the total target power, send a control signal for lowering the unit target power to all local demand control devices. A central processing unit for outputting via
With
Total demand control is performed so that the total predicted power is lower than the total target power.

A demand control device according to claim 3 of the present invention is
In the demand control device according to claim 1 or 2,
A current transformer for detecting a current of a distribution main line connected to a load;
An instrument transformer for detecting the voltage of the distribution mains connected to the load;
A measurement unit that measures current and voltage and outputs a current value and a voltage value;
An output control unit that performs output control on the load; and
A central processing unit that inputs a current value and a voltage value from the measurement unit and calculates a unit predicted power, and outputs a control signal that suppresses output of the load to the output control unit when the unit predicted power exceeds the unit target power;
With
The local demand control is performed so that the unit predicted power is lower than the unit target power.

Moreover, the demand control apparatus according to claim 4 of the present invention includes:
In the demand control device according to any one of claims 1 to 3,
The local demand control device is provided inside the circuit breaker for wiring.

A demand control device according to claim 5 of the present invention is
In the demand control device according to any one of claims 1 to 3,
The local demand control device is characterized in that it is connected to the subsequent stage of the circuit breaker for wiring via a power distribution trunk line.

According to the present invention as described above,
(1) Since the wiring of the load control line is a wiring with the local demand control device arranged for each department, the wiring distance is shorter than that of the prior art, and the load control line can be saved.
(2) Since the energy saving control closed within the department is performed by the local demand control device, there is no sense of unfairness among the departments regarding the energy saving.
(3) Since energy management can be performed in units of departments using the local demand control device, thorough energy saving management can be achieved in units of departments.

  In general, demand control is performed separately for each unit, and the responsibility of each unit is clarified to prevent an increase in the maximum demand power in each unit. It is possible to provide a demand control device that prevents a situation exceeding the above.

The demand control apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example in which the demand control device of this embodiment is installed in a customer facility.
As a customer facility, it is assumed that the load is installed at various locations within the factory site, as in the description of the prior art. In addition, as specific examples of units, in this embodiment, departments A, B, and C which are company organizations are listed. This form demonstrates the demand control apparatus which performs demand control with respect to the load installed in each part A, B, and C of each customer facility.

In such customer facilities, disconnector 101, breaker 102, transformer 103, wiring breaker 104, departmental circuit breaker 105, departmental load 106, current transformer 107, transformer 108, transaction watt-hour meter. 109, a transaction demand meter 110 is provided.
The demand control device includes a current transformer 1, a pulse converter 2, a demand monitoring device 3, local demand control devices 4, 5, 6, and a monitoring device 7.

Then, each structure of a demand control apparatus is demonstrated.
The current transformer 1 outputs a current transformation signal in accordance with a signal (a signal representing a transaction power amount or power) sent to the transaction demand meter 110.
The pulse converter 2 converts the current transformation signal and outputs a pulse.
The demand monitoring device 3 inputs a pulse and performs demand monitoring. This monitoring is a demand monitoring of the entire customer facility. Details of demand monitoring will be described later.
The local demand control devices 4, 5, and 6 are arranged immediately below the circuit breaker 104 that is a distribution breaker of the departments A, B, and C, and monitor the power in each department.

Next, the internal configuration of the demand monitoring device 3 will be described with reference to the drawings. FIG. 2 is an internal configuration diagram of the demand monitoring apparatus.
As shown in FIG. 2, the demand monitoring apparatus 3 includes an input terminal block 31, a central processing unit 32, a target power setting unit 33, a communication unit 34, a power supply unit 35, and a communication terminal block 36. The power supply unit 35 supplies power to each unit. The operation will be described later.

  Next, the internal configuration of the local demand control device will be described with reference to the drawings. FIG. 3 is an internal configuration diagram of the circuit breaker for wiring and the local demand control device. This figure shows a circuit breaker (more specifically, a MCCB: Molded-Case Circuit Breaker) 104 and a local demand control device 4 arranged on a single-phase three-wire three-wire distribution trunk line 111. Here, only the local demand control device 4 installed in the department A will be described, and the redundant description of the local demand control apparatuses 5 and 6 of the departments B and C will be omitted.

As shown in FIG. 3, the local demand control device 4 includes a sensor box 41, a measurement display unit 42, and a demand output unit 43.
The sensor box 41 includes a CT (current transformer) 41a, a PT (instrument transformer) 41b, and a power supply unit 41c. The power supply unit 41c supplies power to each unit.
The measurement display unit 42 includes a measurement unit 42a, a central processing unit 42b, a display unit 42c, a communication unit 42d, and a communication terminal block 42e.
The demand output unit 43 includes an output control unit 43a and an output terminal block 43b.
The distribution main line 111 is drawn into the local demand control device 4, and this distribution main line 111 is drawn into the sensor box 41. The operation of each part will be described later.
Such local demand control devices 4, 5, and 6 are daisy chained as shown in FIG. 1, and the demand monitoring device 3 is connected to any or all of the local demand control devices 4, 5, and 6. The demand monitoring device 3 and the local demand control devices 4, 5, 6 are controlled in conjunction with each other.

Next, a series of processing for demand control will be described.
First, the overall target power is calculated based on the contract power, and the department target power of each department (which is a specific example of unit target power) is calculated. Then, as shown in FIG. 2, the target power setting unit 33 of the demand monitoring device 3 is operated to register the overall target power in the memory unit built in the central processing unit 32. Further, the departmental target power of each department is also built into the central processing unit 42b via the communication unit 34 and the communication terminal block 36, via the communication terminal block 42e of the local demand control device 4 shown in FIG. Registered in the memory unit. In addition, it is similarly registered in the other local demand control devices 5 and 6.

  Further, the setting of the overall target power and the department target power is calculated by using the monitoring device 7 which is a computer, and first communicates with the central processing unit 32 via the communication terminal block 36 and the communication unit 34 to be built in. To the memory unit incorporated in the central processing unit 42b via the communication terminal block 42e and the communication unit 42d of the local demand control device 4, and to the other local demand control device 5, 6 may be registered in the same manner.

Demand control is started after setting the overall target power and departmental target power.
As shown in FIG. 1, a pulse converter 2 inputs a signal sent from a trading watt-hour meter 109 to a trading demand meter 110 via a current transformer 1, and the pulse converter 2 sends a signal-converted pulse to a demand. Output to the monitoring device 3. In the demand monitoring apparatus 3, as shown in FIG. 2, the pulse from the pulse converter 2 is input via the input terminal block 31, and the central processing unit 32 calculates the current power from this pulse. And although mentioned later, the total prediction electric power of the whole consumer facility is calculated. The overall target power is registered in the memory unit built in the central processing unit 32 as described above. The central processing unit 32 compares the total target power and the total predicted power, and determines whether or not the total demand control is necessary. When the total demand control is necessary, the central processing unit 32 sends a control signal to the communication unit 34 and Output to the local demand control devices 4, 5, 6 through the communication terminal block 36. Details of the total demand control contents will be described later.

Simultaneously with such total demand control, the local demand control devices 4, 5, and 6 perform local demand control for each department. Here, only the local demand control of the local demand control apparatus 4 installed in the department A will be described, and the local demand control of the local demand control apparatuses 5 and 6 of the departments B and C is the same, and redundant description is omitted.
As shown in FIG. 3, the CT 41 a installed in each of the three phases of the distribution main line 111 picks up the current of the distribution main line 111, and the PT 41 b picks up the voltage of the distribution main line 111. The power supply unit 41 c receives power from the distribution trunk line 111 and supplies power to each unit in the local demand control device 4.

The measurement unit 42a of the measurement display unit 42 outputs the current value and the voltage value to the central processing unit 42b based on the current signal / voltage signal output from the CT 41a and PT 41b, and the central processing unit 42b calculates the current value and the voltage value from the current value and the voltage value. The current power is calculated, and the department predicted power of the department A is calculated based on the above formula 1, and it is determined whether or not to perform local demand control on the load by a demand algorithm described later. And when performing local demand control, the control signal which suppresses an output with respect to load is output via the output control part 43a of the demand output part 43, and the output terminal block 43b, and control is performed. As shown in FIG. 1, the load to be controlled is, for example, the department load (department A1 load, department A2 load, department A3 load or all) 106 of department A, and is a digital simple load. For example, temperature control of an air conditioner or illumination illuminance control.
In addition, the measurement display unit 42 displays the control by the display unit 42c, and communicates with the demand monitoring device 3 and the other local demand control devices 5 and 6 through the communication unit 42d and the communication terminal block 42e. Do.

Next, specific examples of total demand control and local demand control will be described with reference to the drawings. 4 is a demand time-power diagram of department A, FIG. 5 is a demand time-power diagram of department B, FIG. 6 is a demand time-power diagram of department C, and FIG. 7 is a demand time-power diagram of the entire facility.
The control content for each elapsed time will be described below.
(1) Situation at Elapsed Time t _{1 As} shown in FIG. 4, in Department A, department predicted power at Elapsed Time t ₁ (dotted line and demand plotting department predicted power obtained by calculation using Equation 1 above) The value of the intersection with the time limit) does not exceed the department target power of department A (the value of the intersection of the solid line that is the department target power line and the demand time period), so the local demand control device 4 of department A performs local demand control. Absent.
As shown in FIG. 5, similarly in the department B, the department predicted power at the elapsed time t ₁ does not exceed the department target power of the department B, so the local demand control device 5 of the department B does not perform local demand control.
As shown in FIG. 6, since the department predicted power at the elapsed time t ₁ exceeds the department target power of department C as shown in FIG. 6, the local demand control device 6 of department C starts local demand control for the load of department C. To do. By local demand control, control is performed to reduce power used by the department load (for example, any or all of department C1 load, department C2 load, department C3 load) 106.
As shown in FIG. 7, in the entire facility, the overall predicted power of the entire customer facility at the elapsed time t ₁ does not exceed the overall target power, so the demand monitoring device 3 does not perform total demand control for the entire facility.

The only local demand control in department At time t ₁ C is started as. Such local demand control will be described with reference to the drawings. FIG. 8 is a flowchart for explaining local demand control processing of the local demand control apparatus.
As shown in FIG. 8, step S1 implements a timer function, and it is determined whether or not a specified time has elapsed. If the specified time has been reached (Yes in step S1), the predicted sector power is calculated. (Step S2). In this case, so that the sector predicted power at the elapsed time t ₁ of FIG. 6 is calculated. The current power used by the department is measured, and the department predicted power is calculated using the above equation (1).
Subsequently, since there is no communication for changing the department target power from the demand monitoring device 3 (No in step S3), the process proceeds to step S5 to determine whether the department predicted power exceeds the department target power or not. Since it is determined that the power is exceeded (Yes in step S5), the process proceeds to step S6 to determine whether or not the output down control is being performed. Since local demand control has not been performed so far and the output down control is not being performed (step S6). No) Proceed to step S8 to perform output down control. The output down control is performed via the output control unit 43a of FIG.

This flow is periodically repeated. For example, the control flow in FIG. 8 in the case where the effect of local demand control appears and the department predicted power falls below the department target power at time ta as shown in FIG. Then, since the department predicted power is lower than the department target power in step S5 (No in step S5), the process proceeds to step S7, and it is determined whether or not the output down control is being performed. Yes) Proceeding to step S9, output return control is performed.
As described above, the local demand control device 6 controls the department target power assigned to its own department so that the department predicted power does not exceed, and consequently suppresses demand power.

(2) Since the sector predicted power in sector A as indicated by the status 4 at the elapsed time t ₂ has not exceeded the division target power, does not perform the local demand control.
As shown in FIG. 5, in the department B as well, the local demand control is not performed because the department predicted power does not exceed the department target power.
As shown in FIG. 6, the department C is under local demand control with respect to the load of the department C.
As shown in FIG. 7, since the overall predicted power exceeds the overall target power in the entire facility, total demand control is started for the entire facility.

This total demand control will be described with reference to a flow. FIG. 9 is a flowchart showing the total demand control process of the demand monitoring apparatus.
Step S10 is a timer function, and it is determined whether or not the specified time has elapsed. If the specified time is reached (Yes in step S10), the total predicted power is calculated (step S11). The current power currently used in the entire customer facility is measured, and the total predicted power is calculated using the above equation (1). In this case it is assumed that the entire predicted power predicted in the elapsed time t ₂ in FIG. 7 is calculated. Next, since it is determined whether or not the total predicted power exceeds the total target power (Yes in step S12), the process proceeds to step S13, and the local demand control device has already changed the department target power. Since the total demand control has not been performed so far and has not been changed (No in step S13), the fact that the department target power is changed is communicated to all the local demand control devices (step S15). ).

  In this case, in the control flow of the local demand control device shown in FIG. 8, it is determined that there is a department target power change communication (Yes in step S3), and the department target power is changed (step S4). As a result, the department target power is processed based on the changed department target power in the control flow of the local demand control device thereafter.

Returning to FIG. 4 to FIG. 7 regarding the local demand control of each department, the department target powers of the departments A, B, and C at the demand time t ₂ are the department target powers reduced during the total demand control (see FIG. 4, the value of the intersection of the dotted line in FIG. 5 and FIG. 6 and the demand time period).
At this time, as shown in FIG. 4, in the department A, since the department predicted power exceeds the department target power at the time of total demand control, the local demand control by the local demand control device 4 is started.
In the department B shown in FIG. 5, the local demand control is not performed because the department predicted power is still below the department target power at the time of total demand control.
In the department C shown in FIG. 6, since the department target power is further reduced during the local demand control, a steeper local demand control is subsequently performed.

Then, such total demand control is while Subsequently, as shown in Figure 7, it appears the effect of total demand control, if the total predicted power at time t _b is determined to be less than the target total power, demand monitor The apparatus 3 performs the following processing in S11 to S16 of the control flow shown in FIG.
The total predicted power is calculated (step S11). This case is the entire predicted power at the elapsed time t _b of Figure 7. Next, since it is determined whether or not the total predicted power exceeds the total target power (No in step S12), the process proceeds to step S14, and the local demand control device has already changed the department target power amount. Since it has been changed and the total demand control has been performed so far (Yes in step S14), it communicates to all the local demand control devices that the department target power is restored ( Step S16).

  By performing such total demand control by the demand monitoring device 3 and local demand control by the local demand control devices 4, 5, and 6, in a department with large power consumption (for example, department C in the description of the present embodiment) As described above, the steep local demand control is performed, but the local demand control is not performed in a department with low power consumption (for example, department B in the description of this embodiment). As described above, demand control corresponding to the amount of power used is performed in each department, and it is felt that each department A, B, and C is fair. Furthermore, the idea of refraining from use in each department is fostered, and eventually the overall power use can be suppressed and the maximum demand power can be lowered.

In the above-described embodiment, the internal configuration of the local demand control device 4 has been described as including only the sensor box 41, the measurement display unit 42, and the demand output unit 43 as shown in FIG. It is not limited.
For example, although not illustrated, a single configuration in which the measurement display unit and the demand output unit of the local demand control device are integrated may be adopted. In addition to the sensor box, the measurement display unit, and the demand output unit, the circuit breaker (MCCB) 104 may be integrated into a breaker with a built-in local demand control device (or a local demand control device with a built-in breaker). .

From the above explanation, it is possible to protect the contract power of the entire customer facility while performing local demand control for each department. Compared to the conventional case where demand control is performed using the contract power of the entire customer facility. There is an effect that energy management can be carried out fairly between departments.
In addition, because the department target power, which is the target power consumption value within the department, corresponds to the role of the distributed power value for each department, the energy saving target value can be clarified for each department using this value. effective. At the same time, by gradually reducing the target power of the sector, energy conservation efforts in the sector can be achieved.

  In this embodiment, a factory facility is assumed as a customer facility. However, the demand control device of the present invention may be applied to various facilities such as high-rise buildings and large-scale shopping malls as customer facilities. The unit in this case becomes a tenant, and the demand control device of the present invention can be made to function by setting a unit according to circumstances.

It is a block block diagram which shows the example which installed the demand control apparatus of the best form for implementing this invention in a consumer facility. It is an internal block diagram of a demand monitoring apparatus. It is an internal block diagram of the circuit breaker for wiring, and a local demand control apparatus. FIG. 4 is a demand time-power line diagram of a department A. FIG. 4 is a demand time-power line diagram of a department B. FIG. 6 is a demand time-power line diagram of a department C. It is the demand time-power diagram of the whole facility. It is a flowchart explaining the local demand control process of a local demand control apparatus. It is a flowchart which shows the process of the total demand control of a demand monitoring apparatus. It is a block block diagram which shows the example which installed the demand control apparatus which is a prior art in a consumer facility. It is explanatory drawing of the algorithm of demand control.

Explanation of symbols

1: current transformer 2: pulse converter 3: demand monitoring device 31: input terminal block 32: central processing unit 33: target power setting unit 34: communication unit 35: power supply unit 36: communication terminal blocks 4, 5, 6: Local demand control device 41: Sensor box 41a: CT (current transformer)
41b: PT (instrument transformer)
41c: power supply unit 42: measurement display unit 42a: measurement unit 42b: central processing unit 42c: display unit 42d: communication unit 42e: communication terminal block 43: demand output unit 43a: output control unit 43b: output terminal block 7: Monitoring device 101: Disconnector 102: Circuit breaker 103: Transformer 104: Circuit breaker 105: Department circuit breaker 106: Department load 107: Current transformer 108: Transformer 109: Electricity meter 110 for transaction 110: For transaction Demand meter 111: Distribution main line

Claims (5)

The total predicted power calculated based on the current power of the entire customer facility and the total target power set in advance for the entire customer facility, so that the total predicted power does not exceed the total target power A demand monitoring device that performs demand control;
The unit predicted power does not exceed the unit target power by comparing the unit predicted power calculated based on the current power of the load set by dividing the customer facility by unit with the unit target power preset for each unit. A plurality of local demand control devices that perform local demand control,
With
When the total predicted power exceeds the total target power, the demand monitoring device performs setting to lower the unit target power for each local demand control device, and the unit predicted power exceeds the unit target power after the setting change. Or the demand control apparatus which suppresses the maximum demand power of the whole consumer facility by local demand control which one part local demand control apparatus performs, and performs total demand control. The demand control device according to claim 1,
The demand monitoring device includes:
A target power setting unit for performing an operation of setting the overall target power;
A communication unit that communicates with the demand monitoring device and the plurality of local demand control devices via a communication line;
Calculate the total predicted power from the current power of the entire customer facility, and if the total predicted power exceeds the total target power, send a control signal for lowering the unit target power to all local demand control devices. A central processing unit for outputting via
With
A demand control device that performs total demand control so that total predicted power is less than total target power. In the demand control device according to claim 1 or 2,
A current transformer for detecting a current of a distribution main line connected to a load;
An instrument transformer for detecting the voltage of the distribution mains connected to the load;
A measurement unit that measures current and voltage and outputs a current value and a voltage value;
An output control unit that performs output control on the load; and
A central processing unit that inputs a current value and a voltage value from the measurement unit and calculates a unit predicted power, and outputs a control signal that suppresses output of the load to the output control unit when the unit predicted power exceeds the unit target power;
With
A demand control device that performs local demand control so that unit predicted power is lower than unit target power. In the demand control device according to any one of claims 1 to 3,
The local demand control device is provided inside a circuit breaker for wiring. In the demand control device according to any one of claims 1 to 3,
The local demand control device is connected to the subsequent stage of the circuit breaker for wiring via a power distribution trunk line.

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