JP5272252B2 - Demand control system - Google Patents

Description

  The present invention is provided in a power receiving facility including an air conditioner and a refrigerator, and prevents the optimum operation of the air conditioner and the refrigerator as much as possible and prevents the demand value from exceeding a predetermined value. The present invention relates to a demand control system intended to reduce power consumption of a machine.

  In a contract between a power consumer with a power receiving facility and a power company, the power charge is a metered charge consisting of a basic charge and the amount of power used. Of these, the basic fee is determined based on the maximum demand value for one year.

  For this reason, it is common for power consumers to avoid exceeding the demand value by using a demand controller or the like for the power receiving equipment so that the daily demand value does not exceed the contract power.

Also, as a means of avoidance, it is common to stop air-conditioners and refrigerators that consume a large amount of power to reduce the demand value, and place where air-conditioners and refrigerators are installed, such as preparing time schedules and stopping in stages Some have taken into account (for example, see Patent Document 2).
JP 2003-304637 A Japanese Patent Laid-Open No. 2003-23729

  However, the conventional demand controller for air conditioners and refrigerators is controlled according to the predetermined order of control or the power consumption order of the air conditioners and compressors. In addition, the indoor environment cannot be judged due to the operation of the refrigerator, and it can be stopped in an environment where operation is necessary, the stop of the environment that can be stopped is delayed, or even before the demand time limit, it is stopped as a whole Inconvenience may occur, such as.

  This invention solves said subject and provides the demand control system which suppresses a raise of electric energy, interlocking with the operating condition of the installation place of an air conditioner or a refrigerator, and maintaining the comfort of an indoor environment. That is.

In order to solve the above-mentioned problem, the invention according to claim 1 is a power receiving facility including a plurality of air conditioners and refrigerators, and has a contract power in which a power amount for each demand time period, which is a predetermined period, is determined in advance. a demand control system to reduce the power consumption of the air conditioner and the refrigerator so as not to exceed, provided in the power receiving equipment, a power amount detector for detecting the amount of power the power receiving facility has consumed, the power A power amount storage unit that quantifies and stores the amount of power detected by the amount detection unit, and a demand prediction that calculates a prediction of the amount of power within a demand time period based on the numerical amount of power stored by the power amount storage unit And a data transmission / reception unit capable of transmitting a prediction result predicted by the demand prediction unit to an external device when the predetermined cycle changes to the next cycle and a prediction result predicted by the demand prediction unit And location, provided in the air conditioner and the refrigerator, and the operation control unit to switch to forcibly stop or low-load operation the operation of the air conditioner and refrigerator, electric energy consumption of the air conditioner and refrigerator An operating state detection unit to detect, an operating state storage unit that digitizes and stores the electrical energy detected by the operating state detection unit as an electrical energy amount, and a digitized electricity stored in the operating state storage unit energy of the air conditioner based on the transition and the operating status of the refrigerator, the consuming the first situation is stopped, a predetermined electrical energy amount be running on a predetermined time following and 2 status, and operating status determination section for determining other third-like situation, a data transceiver capable of receiving the prediction result sent from the demand monitoring device, received through the data transceiver A demand control device comprising: a power control device including a prediction result from the demand monitoring device and a control determination unit that determines execution or rejection of the operation in the operation control unit based on the determination of the operation status determination unit. Control system.

  According to a second aspect of the present invention, the data transmission / reception unit of the power control apparatus includes a data transmission unit that transmits a numerical operation status, and the data control unit of the demand monitoring apparatus transmits the data transmission / reception unit. The demand control system according to claim 1, further comprising a data receiving unit configured to receive an operation status, wherein the demand prediction unit uses the operation status for prediction of electric energy.

  According to the first aspect of the present invention, the plurality of air conditioners and refrigerators are provided with the power control device, and the operation statuses of the air conditioners and the refrigerator are numerically stored. For example, in the case of current consumption, when the operation status to be digitized is current consumption exceeding a predetermined threshold, the indoor environment has a certain effect by the air conditioner and the refrigerator. It can be judged that it is obtained. Further, it is possible to determine the effect of the air conditioner and the refrigerator on the indoor environment based on the time elapsed in a state where the predetermined threshold value is continuously exceeded. If the predetermined threshold value is not exceeded, the indoor environment is considered to require the effects of the air conditioner and the refrigerator. After making such a determination, when the prediction result is received from the demand monitoring device, it is determined whether to stop or reject the air conditioner and the refrigerator. Moreover, since the prediction result fluctuates, it does not always continue to refuse the stoppage. For example, stop is rejected for a prediction result that is relatively urgent, but it is also conceivable to execute an immediate stop if the result is an urgent prediction result. In addition, even if the prediction result is the same urgency level, an immediate stop may be executed if it is determined that the effect given to the indoor environment has been sufficiently obtained.

  According to the second aspect of the present invention, the power control device can transmit the operation status that is digitized, and the demand monitoring device can receive the operation status of the power control device. The demand monitoring device must know the power of controllable air conditioners and refrigerators and the power of other facilities that cannot be controlled among the power consumed by the power receiving equipment. In addition, it is possible to predict the amount of power within the demand time period by adding an effect when the power control device controls the operation of the air conditioner and the refrigerator.

  Embodiments of a demand control system according to the present invention will be described below in detail with reference to the drawings.

  As shown in FIG. 1, the demand monitoring apparatus 1 according to the present embodiment uses the pulse detector 301 of the power receiving facility 3 to grasp the power consumption of the power receiving facility 3 from the power amount detecting unit 102, and 101, and the amount of electric power reached within the time period is predicted from the elapsed time within the time period and the transition of the value of the electric energy storage unit 101. When it is predicted that the predicted power amount exceeds the predetermined contract power, the data transmission / reception unit 104 is used to transmit the prediction result. This prediction result may indicate any of a plurality of determined urgency levels, or a numerical value may be transmitted as it is.

The power control apparatus 2 uses the current sensor 401 provided in the power supply line 403 that supplies power from the power receiving facility 3 to the compressor 4 of the air conditioner and the refrigerator, and uses the current sensor 401 to determine the current consumption of the compressor 4. And stored in the operation state storage unit 203. The operating state determination unit 204 determines the importance of the operation of the compressor 4 based on the transition of the current value stored in the operation state storage unit 203. When the control determination unit 206 determines that it is not important based on the prediction result transmitted from the demand monitoring apparatus 1 and the importance of the operation of the compressor 4 determined by the operation status determination unit 204 , the control determination unit 206 starts from the operation control unit 202. When the operation switching relay provided in the compressor 4 is driven to stop or shift to low load operation and it is determined that it is important, the compressor 4 is stopped to shift to stop or low load operation.

  Here, a specific configuration of the present embodiment will be described with reference to FIG. In a demand control system in which a demand monitoring device 1 provided in a power receiving facility 3 and a power control device 2 provided in a compressor 4 of a plurality of air conditioners and refrigerators are connected by a communication line 5, an air conditioner and a refrigerator are It operates to cool the heat source of the production facility 6.

  The power consumption of the power receiving facility 3 and the current consumption of the compressor 4 will be described with reference to FIG. 3 (1), (2), and (3) are graphs of the amount of power consumed at the timings T1, T2, and T3 within the demand time period of the power receiving equipment 3, and FIGS. It is a transition of current consumed by three of the compressors 4.

  At timing T1 in FIG. 3 (1), the demand monitoring apparatus 1 exceeds the predetermined contract power PS with the prediction of the transition of the electric energy as the P1 line. It transmits to the control apparatus 2. The power control device 2 provided in the compressor 4 shown in the graph of (A) refuses to stop the compressor 4 at the timing T1 because the compressor 4 has just been operating. The power control device 2 provided in the compressor 4 shown in the graph of (B) refuses to stop because the compressor 4 is stopped at the timing T1. The power control device 2 provided in the compressor 4 shown in the graph of (C) is that the compressor 4 continuously operates for a predetermined time or more at the timing T1 and consumes a predetermined current value. At the present time, the compressor 4 is stopped because it is determined that the installation location of the air conditioner and the refrigerator can maintain a comfortable environment.

  At the timing T2 in FIG. 3 (2), the demand monitoring apparatus 1 exceeds the predetermined contract power PS with the prediction of the transition of the electric energy as the P2 line, and the remaining time within the demand time period is small. The result is transmitted to the power control apparatus 2 using the communication line 5. In the power control device 2 provided in the compressor 4 shown in the graph of (A), the compressor 4 continuously operates for a predetermined time or more and consumes a predetermined current value or more at the timing T2. Therefore, at the present time, it was judged that the installation location of the air conditioner and the refrigerator can maintain a comfortable environment, and the compressor 4 was stopped. In the power control device 2 provided in the compressor 4 shown in the graph of (B), the prediction result transmitted from the demand monitoring device is at a high level immediately after the compressor 4 is operating at the timing T2. Therefore, the compressor 4 was stopped. The power control device 2 provided in the compressor 4 shown in the graph of (C) maintains the stopped state as it is because the compressor 4 is stopped at the timing T2.

  At timing T3 in FIG. 3 (3), the demand monitoring apparatus 1 does not exceed the contracted power PS determined in advance with the prediction of the transition of the electric energy as the P3 line. It transmits to the power control apparatus 2. The power control device 2 provided in the compressor 4 shown in the graph of (A) continues to stop at the timing T3 based on the past consumption current, the operating time, and the current stop time of the compressor 4. However, it is determined that the installation location of the air conditioner and the refrigerator can maintain the allowable environment, and the stop is continued. When the power control device 2 provided in the compressor 4 shown in the graph of (B) continues to stop at the timing T3 based on the past consumption current, the operating time, and the current stop time of the compressor 4, the air conditioning is performed. It judges that the environment of the installation place of a machine and a refrigerator is impaired, and cancels | releases the stop of the compressor 4. FIG. When the power control device 2 provided in the compressor 4 shown in the graph of (C) continues to stop at the timing T3 based on the past consumption current, the operating time, and the current stop time of the compressor 4, the air conditioning is performed. It judges that the environment of the installation place of a machine and a refrigerator is impaired, and cancels | releases the stop of the compressor 4. FIG.

  Next, the operation of the demand monitoring apparatus will be described with reference to the embodiment of FIG. 1 and the flowchart of FIG.

  In S1, the power amount of the power receiving facility 3 is acquired by the power amount detection unit 102. In S2, the acquired power amount is accumulated and stored. In S3, the power amount within the demand time period is predicted based on the accumulated power amount. Yes.

  In S4, it is determined whether or not the predicted power amount exceeds the preset contract power. If it is determined that the predicted power amount is exceeded, the value predicted in S5 is transmitted to the power control apparatus 2.

  In S6, it is confirmed whether the demand time period has been updated. If it has been updated, the prediction is reset in S7, and the process returns to S1 and is repeated.

  Next, the operation of the power monitoring apparatus will be described with reference to the embodiment of FIG. 1 and the flowchart of FIG.

  In S1, the operating state of the compressor 4 is acquired by the operating state detection unit 201. In S2, the acquired operating state is quantified and stored. In S3, the operating state is determined based on the quantified operating state.

  In S4, it is confirmed whether the predicted value is transmitted from the demand monitoring apparatus 1, and if it is transmitted, it is determined whether or not the control is executed based on the operation status and the predicted value in S5. Performs control in S7, stops the compressor 4 or shifts to low load operation, and returns to S1 to repeat.

  As described above, according to the present invention, even when the power consumption is reduced so as not to exceed the contracted power, the demand monitoring device is based on the numerically predicted value and the operation status of the installation location of the air conditioner and the refrigerator. It is possible to predict the environment of the installation location and decide whether to shift to the stop and low-load operation or reject the stop, so that it is possible to reduce power consumption while maintaining environmental comfort.

  It is a connection block diagram of the demand control system which concerns on embodiment of this invention.   It is a connection block diagram of the demand control system which concerns on embodiment of this invention.   It is an example of the time chart which concerns on embodiment of this invention.   It is a flowchart of the demand monitoring apparatus which concerns on embodiment of this invention.   It is a flowchart of the electric power monitoring apparatus which concerns on embodiment of this invention.

Claims (2)

In power receiving equipment including a plurality of air conditioners and refrigerators, the power consumption of the air conditioners and refrigerators is reduced so that the amount of power per demand time period, which is a predetermined period, does not exceed a predetermined contract power. A demand control system , which is provided in the power receiving facility and detects a power amount consumed by the power receiving facility, and a power amount storage that quantifies and stores the power amount detected by the power amount detecting unit A demand prediction unit that calculates a prediction of the amount of power within the demand time period based on the digitized amount of power stored in the power amount storage unit, and a point in time when the predetermined period changes to the next period Provided in a demand monitoring device comprising a periodical update notification and a data transmission / reception unit capable of transmitting a prediction result predicted by the demand prediction unit to an external device, the air conditioner and the refrigerator, and the air conditioning And a driving control unit for switching the forced stop or low-load operation the operation of the refrigerator, and OPERATION state detector for detecting an electrical energy consumption of the air conditioner and the refrigerator, the operation state detection unit detects the electrical operating condition storage unit that stores as an electrical energy amount by digitizing the energy, the air conditioner wherein the operation state storage unit on the basis of transition of the electrical energy obtained by digitizing stored and refrigerator Operation status determination for determining a first status that is stopped , a second status that is operating for a predetermined time and consuming a predetermined amount of electrical energy, and a third status other than that parts and, a data transmitting and receiving section capable of receiving the prediction result sent from the demand monitoring device, the prediction result and the operation from the demand monitoring device received through the data transceiver Demand control system characterized by comprising a power control apparatus and a control determination unit that determines the execution or denial of operation in the operation control unit based on the status determination unit for determining.   The data transmission / reception unit of the power control device includes data transmission means for transmitting a digitized operation status, and the data transmission / reception unit of the demand monitoring device includes data reception means for receiving the operation status transmitted by the power control device. The demand control system according to claim 1, wherein the demand prediction unit uses the operation status for prediction of electric energy.

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