JP3866979B2 - Power control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power control apparatus that can reduce the amount of power used by demand control, and more particularly, to a power control apparatus that can easily know the amount of reduction in power consumption.
[0002]
[Prior art]
The monthly electricity charge paid by each company to the electric power company is calculated by adding the basic charge (contracted electricity charge) and the used electricity charge. Here, the electricity usage rate is the monthly electricity usage measured by the power company's trading meter, but the basic rate is calculated differently depending on the difference between the actual quantity contract, transformer contract, and large power contract. Is adopted.
[0003]
The actual amount contract is applied when the contract power facility is 60 kW or more and less than 500 kW, and the contract for each month is determined by the maximum value of power used for 30 minutes in the past 12 months including that month. This is a method for determining power. In addition, the maximum value of this electric power is called maximum demand electric power (demand), and the basic charge of an electricity bill is determined by this demand value.
[0004]
On the other hand, the transformer contract is a method in which the contract power is determined by the size of the transformer capacity of the power receiving facility, and is applied when the contract power facility is less than 60 kW as of May 2000, but by 2002 Is planned to shift to the fixed quantity system even if the contract power equipment is less than 60 kW.
[0005]
A large-scale power contract is applied when the contract power facility is 500 kW or more. In this case, the maximum power consumption peak is measured, and the contract electricity charge is determined by discussion between the user and the power company. It is determined. However, when the demand contract value determined by the discussion is exceeded, an excess of 1.5 times is generated and the contract value is increased.
[0006]
Therefore, it is extremely important to keep the maximum demand power (demand) low regardless of which contract method is used. Therefore, various devices have been proposed as demand control devices. For example, the device according to Japanese Patent No. 3037939 has been adopted by many companies and gained popularity.
[0007]
[Problems to be solved by the invention]
However, depending on the user, when this apparatus is used, the air conditioner is operated so smoothly that there is a concern that the power consumption can be really reduced. Here, it is conceivable to grasp the operation status of the demand control device at the position of the transaction meter, but this means that the power consumption including devices that are not subject to demand control is grasped and accuracy is lacking. There's a problem. In addition, since it is difficult to accurately grasp the power saving amount, the collection and tabulation of data are complicated and lack practicality.
[0008]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a power control device capable of accurately and numerically grasping the effect of demand control while easily collecting and aggregating data. To do.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a power control apparatus that is connected to each power device and forcibly cuts off the operation of the power device and performs demand control. A main process that is repeatedly executed and a timer interrupt process that is interrupted to start the main process at regular intervals, and the timer interrupt process substantially detects instantaneous power supplied to the power device. If a significant value is detected in the first process, the second process for cumulatively counting the number of times, and if no significant power is detected in the first process, And a third process for cumulatively counting the number of times depending on whether or not the current cutoff is forcibly Thus, the power consumption of the power device, the total operation time, the total forcible cut-off time, the total stop time that is not forcibly cut-off are obtained, and the actual power consumption calculated based on the power consumption and the actual operation The average power consumption is calculated based on the time, and the control power reduced by demand control can be calculated by multiplying this by the control time calculated based on the total forced cutoff time. ing.
[0010]
In the present invention, the fact that instantaneous power is substantially detected is not limited to the case where the power value is directly detected, but also includes the case where the power value is indirectly detected from the current value or the voltage value. In any case, according to the present invention, the number of times a significant value is detected in the first process and the number of times that a significant value is not detected are cumulatively counted, and the first process is performed at regular intervals. Therefore, it is possible to accurately grasp the operating status of the electric power device to be controlled. These points are the same in the following inventions.
[0011]
Further, the present invention is a power control apparatus that is connected to each power device and forcibly cuts off the operation of the power device and performs demand control, and is demand control that is repeatedly executed in an infinite loop after power-on. And a timer interrupt process that is started at regular intervals without being directly related to the demand control process, and in the timer interrupt process, Power consumption, total Operating time ,total Forced shut-off time , Total stop time without forced shutdown And store information based on the measurement results in a non-volatile storage element. A value obtained by calculating the average power consumption based on the actual power consumption calculated based on the power consumption and the actual operation time, and multiplying this by the control time determined based on the total forced cutoff time. As a result, control power reduced by demand control can be calculated. Yes.
[0012]
In the present invention, a nonvolatile memory element is an element that retains stored contents even after power is turned off. Preferably, it is a storage element that can be freely attached and detached, and specifically corresponds to an IC card (a card-type storage medium incorporating an IC memory), a memory card, or the like. Note that a memory card is a generic name for a stamp-sized IC card, and is also used as an ultra-small storage medium incorporated in a digital camera, a digital recorder, or a portable terminal.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail based on examples. FIG. 1 illustrates a connection relationship between a power control apparatus 1 according to an embodiment and a power device 2 that is demand-controlled by the power control apparatus 1. FIG. 4 is a front view of the power control apparatus 1 and illustrates a state where the case is opened.
[0014]
The power device 2 to be controlled is not particularly limited, but is typically a refrigerator or an air conditioner. FIG. 1 receives a three-phase AC voltage R, S, T of 200V. A compressor motor MC to be operated and a relay Re for forcibly stopping the operation of the motor MC are shown. In addition, the power control apparatus 1 records the operation status of the power device 2 in a non-volatile memory (EEPROM) every 30 minutes, and, if necessary, another computer device (such as a laptop computer) through the RS232C port. The recorded contents are transmitted to the network. In the notebook personal computer, the operation status of the power device 2 is aggregated to generate information such as total power consumption, total power saving amount that can be saved by the control of this apparatus, and total operation time.
[0015]
The internal configuration of the power control apparatus 1 is as shown in the block diagram of FIG. 2. The power supply unit 3 receives AC 100V (or 200V) and converts it into a DC voltage, and the state monitoring unit 4 grasps the operating state of the compressor. An operation display unit 5 for displaying the operation state of the compressor, a setting switch 6 for setting whether or not to operate the power control device 1, and whether the power control device 1 is in the control mode or the non-control mode. The state display unit 7 for displaying the signal, the non-control mode is always set for several minutes after the compressor is restarted, the feedback time setting unit 8 for setting the duration for maintaining the non-control mode, and the control of the demand control By controlling the control rate setting unit 9 for setting the rate and the relay Re built in the power device 2 to be controlled, the compressor motor MC is turned on / off. The compressor control unit 10 controls the F, and the central processing unit 11 controls the operation of the entire apparatus.
[0016]
Specifically, the state monitoring unit 4 is a current detector Se that detects a current value of a three-phase AC supplied to the motor MC, and the central processing unit 11 operates the compressor based on the detected current value. It is determined whether or not it is in a state. As shown in the front view (FIG. 4) of the power control device 1, the operation display unit 5 is specifically an LED lamp 5. If the compressor to be controlled is in an operating state, the LED lamp is lit in green. In the stop state, the LED lamp is turned off.
[0017]
In this embodiment, the setting switch 6 is the switch 6 at the left end of the dip switch section 12 (FIG. 4). When the power control device 1 is used, the setting switch 6 is turned on (lower side), and when not used, it is turned off. Set to the side (upper side). The status display unit 7 is a red LED lamp 7 and is provided at a position where it can be seen even when the case of the power control device 1 is closed. If the operation state of the power control device 1 is the control mode, it blinks at 0.1 second intervals, and if it is in the non-control mode, it blinks at 2 second intervals.
[0018]
The feedback time setting unit 8 is a variable resistor in this embodiment, and sets the duration of the non-control state after restarting the compressor within the range of 3 to 15 minutes based on the resistance value. It has become. The control rate setting unit 9 is composed of, for example, a multi-stage changeover switch, and sets control rates such as 10% control and 15% control according to the switching position. The 10% control is a control that stops the compressor only for 3 minutes if a predetermined condition is satisfied. In a normal case of entering the control mode once every 30 minutes, a 10% period is required. It becomes power saving mode. Further, in the 15% control, the compressor is stopped for 4.5 minutes. Therefore, in the normal case of entering the control mode once every 30 minutes, the period of 15% is the power saving mode.
[0019]
Also, one of the dip switch sections 12 is a switch CHG for switching the number of times of control. In a normal case, this switch is set to the upper side so as to enter the control mode once every 30 minutes. ing. On the other hand, when the switch CHG is set to the lower side, it enters the control mode at a rate of twice in 30 minutes. In this state, if the control rate setting unit 9 is set to the 10% position, it is 1 in 15 minutes. The control mode is entered at the rate of times, and the compressor is stopped for 3 minutes. Thus, when the switch CHG is set to the lower side, the power saving effect is increased.
[0020]
The four switches to the right of the dip switch 12 are number switches NUM for setting the device number in binary. For example, when one room is cooled by a plurality of refrigerators, each refrigerator is controlled simultaneously. I try not to enter the mode. In addition, supplementing the explanation with respect to the terminal block 13 of FIG. 4, the AC voltage input terminals R and T, the output terminal Rout to the relay Re, and the input terminal Sin from the current detector are respectively wired from the outside. It is connected.
[0021]
FIG. 3 is a block diagram showing a specific configuration of the central processing unit 11. The central processing unit 11 includes a parallel data input / output unit 20 that transmits / receives data to / from each of the units 5 to 9 shown in FIG. 2, a ROM (Read Only Memory) 21 that stores a control program, and a control program. A random access memory (RAM) 22 that functions as a work area, an EEPROM 23 that stores operation history data based on data from the current detector Se, a timer 24 that generates an interrupt signal and performs a timekeeping function, and as necessary A serial communication unit 25 for transmitting / receiving serial data to / from an external personal computer, an A / D converter 26 for receiving a signal from the current detector Se and converting it to a digital signal, and a series of processing according to a control program stored in the ROM And a CPU 27 for performing the above.
[0022]
Here, the EEPROM (Electrically Erasable and Programmable Read Only Memory) 23 means a flash memory that can be electrically erased and written among non-volatile memories that retain stored contents even after the power is turned off. Since the flash memory 23 can erase data independently for individual sectors (blocks), for example, after accumulating half-year operation history data, it is overwritten in order from the sector that accumulates the oldest data. I am trying to use it.
[0023]
The driving history data stored in the EEPROM 23 is a summary of driving conditions every 30 minutes (temporary). Specifically, the total operating time TIME, the power consumption W, the total forcible cut-off time CUT cut by this apparatus, and the total stop time CTL based on the temperature control of the air conditioner are summarized for a temporary limit (FIG. 7 ( b)). The total operation time is obtained by accumulating the time when significant data is obtained from the current detector Se, and can be measured accurately. For example, in the case of FIG. 7B, τ1 + τ2 + τ3 is the total operation time.
[0024]
The power consumption is calculated from the current value i obtained from the current detector Se and the supply voltage value V, and an accurate value can be obtained as ΣV × i. Further, the stop time CTL can be accurately calculated as the sum of the times during which no significant data is obtained from the current detector Se and during which no forcible interruption is performed.
[0025]
Next, the operation content will be described in the case where the power control device 1 having the above configuration performs demand control of the air conditioner. When the power control device 1 is in a non-operating state (setting switch 6 is OFF), the operation of the compressor is controlled based on the temperature adjustment mechanism of the air conditioner itself, and as shown in FIG. Repeats self-stop and restart.
[0026]
The operation of the power control apparatus 1 includes a main program (FIGS. 5 and 6) that is repeated in an infinite loop after power-on, and a timer interrupt program that is started at 1.0 second intervals based on an interrupt signal from the timer 24 (FIG. 7 (a)), a data input program (not shown) for operating the A / D converter in response to an interrupt signal at intervals of 0.1 second from the timer 24 and acquiring a signal from the current detector Se, a notebook computer, etc. A reception interrupt program (FIG. 8 (a)) that starts processing when a serial signal is received from the receiver, and a transmission interrupt program (FIG. 8 (b)) that starts processing when serial transmission of 1-byte data from the apparatus is completed. ) And.
[0027]
First, the timer interrupt process will be described. As described above, an interrupt pulse is supplied from the timer 24 at intervals of 1.0 seconds, and the CPU that has received the interrupt pulse interrupts the processing at that time (the processing of the main program in FIG. 5). The interrupt process shown in FIG. 7A is started. In the timer interrupt process, after the register saving process (ST20), first, the current measurement value i from the current sensor Se is acquired (ST21). The signal from the current sensor Se is digitally converted by the A / D converter 26 by the data input process at intervals of 0.1 seconds and stored in the RAM 22. For example, on the condition that there are 10 significant data, for example, The average value is obtained as the current value i.
[0028]
Next, it is determined whether or not the current value i is significantly calculated (ST22). If i ≠ 0, the variable TIME is incremented (+1). The variable TIME is a variable for calculating the total operating time of the compressor. Since a significant current measurement value i from the current sensor Se is detected, it is determined that the compressor is operating and one variable value is set. It was increased. Since the timer interruption is at intervals of 1.0 seconds, the total operation time is calculated by calculating TIME × 1.0 seconds.
[0029]
Next, the electric power value V × i obtained by multiplying the measured current value i by the voltage V supplied to the compressor is added to the variable W (ST24). The variable W is a variable for integrating the amount of power used, and the amount of power used is increased because a significant current measurement value i from the current sensor Se is detected.
[0030]
On the other hand, if it is determined in step ST22 that the current measurement value i is zero, it is determined whether or not the forced cutoff is currently being performed (ST25). As will be described later, in the present apparatus, the relay contact is opened under a predetermined condition to forcibly cut off the operation of the compressor (ST12 in FIG. 6), but it is determined whether or not the current is forcibly cut off. If the forced shut-off is currently in progress, the variable CUT for calculating the total time in the forced shut-off state is incremented by 1 (ST26). If not in the forced shut-off, it is determined that the power is shut down by temperature control by the air conditioner, and the temperature control is performed. The variable CTL for calculating the total time in the shut-off state is incremented by 1 (ST27).
[0031]
Finally, after adding 1 to the timer variable T managing the time (30 minutes) (ST28), the saved register value is restored (ST29), and the interrupt process is completed.
[0032]
Next, the main program will be described with reference to FIG. For 30 minutes after the power is turned on, the power control device 1 is always in the non-control mode, and the relay contact is in the CLOSE state (ST1 to ST2). That is, the air conditioner does not receive demand control for 30 minutes after the start of operation, and controls the operation of the compressor based on its own temperature adjustment mechanism. If the switch DM of the dip switch unit 12 is turned off, the processes of ST1 and ST2 are omitted.
[0033]
Next, the timer variable T is reset to zero (ST3), and other variables W, CUT, CTL, and TIME updated by the timer interrupt process are initialized (ST4), and the power control apparatus 1 enters the control mode. (ST5). The use of each variable W, CUT, CTL, and TIME will be further described later.
[0034]
As shown in FIG. 6, in the control mode, first, it is determined whether or not a predetermined time has elapsed since the compressor was restarted (ST10). Here, the time that should elapse from the restart is a value set by the feedback time setting unit 8 and is typically 3 minutes.
[0035]
Therefore, typically, it is determined whether or not 3 minutes or more have elapsed since the restart of the compressor in the process of ST10. If not, the process waits for 3 minutes. Since such a process (ST10) is provided, the compressor is stopped in spite of immediately after the restart, so that the room temperature is prevented from greatly deviating from the control temperature. Note that the restart timing of the compressor can be known from the output change of the current detector Se.
[0036]
If it is confirmed that 3 minutes or more have passed since the restart of the compressor, it is next determined whether or not the compressor is operating based on the output of the current detector Se (ST11). Here, if the compressor is in an operating state, the relay contact is set to OPEN for a certain time T set by the control rate setting unit 9 to forcibly stop the compressor (ST12). In 10% control, the compressor is stopped for 3 minutes and in 10% control for 4.5 minutes, and the air is blown. Thereafter, the relay contact is returned to the ON state.
[0037]
On the other hand, if the result of determination in step ST11 is that the compressor is in a non-operating state (self-stopped state), it waits for the compressor to be restarted, and after a further 3 minutes has elapsed since the restart, only for a certain time T. The relay contact is set to OPEN to forcibly stop the compressor (ST12). In the above-described processing of step ST11, it is determined only whether “N minutes or more have elapsed since the restart of the compressor”, but “whether N minutes have elapsed and before M minutes have elapsed” is determined. If it is determined that M minutes or more have elapsed, the process may proceed to step ST12.
[0038]
With such a process, the compressor is not forcedly stopped immediately before the self-stop, and the power saving state can be reliably achieved for the predetermined time T described above. It is also possible to wait for the compressor to be restarted again regardless of whether or not the compressor is in operation when entering the control mode, and set the relay contact to OPEN after N minutes have elapsed since the restart. If the compressor has been in a stopped state for the past 15 minutes or more, the operation of the compressor is stopped for a certain time after 20 minutes have passed since the restart (ST14).
[0039]
When the operation of the control mode is completed as described above, the relay contact is turned on to shift to the non-control mode (ST6), and whether or not 30 minutes have passed since the process of ST3 based on the value of the timer variable T. Is determined (ST7), and after 30 minutes, the process proceeds to ST8. When the dip switch CUT is set to the lower side, it is determined whether or not 15 minutes have elapsed in the process of ST7.
[0040]
In this way, after 30 minutes or 15 minutes have been confirmed, the values of the variables W, CUT, CTL, and TIME that have been sequentially updated by the timer interrupt process are read out and necessary storage processing is performed. Specifically, the value of the variable W is multiplied by 1/3600, and the value is stored in the EEPROM 23 as the amount of power used for 30 minutes (temporary limit) (ST8). Note that W / 3600 is used for 30 minutes because the power consumption [kWh] for 1.0 second is V × i / (60 × 60) = V × i / 3600 [kWh]. This is because the total amount for 30 minutes is Σ (V × i) / 3600.
[0041]
Further, the variable CUT for calculating the total forcible shut-off time, the variable CTL for calculating the total stop time due to the temperature control of the air conditioner, and the value of the variable TIME for calculating the total operation time are respectively set to the W The value is stored in the EEPROM 23 in association with the value of / 3600 (ST9), and the process returns to step ST3. The values of CUT (seconds), CTL (seconds), and TIME (seconds) are the actual total cut-off time, total stop time, and total operation time.
[0042]
Although the operation content of the power control apparatus 1 is as described above, different device numbers are assigned to the power control apparatus 1 by dip switches NUM. Then, the device of device number 0 starts the processing of ST1 immediately after power-on, the device of device number 1 starts the processing of ST1 after the standby time T1 after power-on, and the device of device number i The processing of ST1 is started after waiting time T1 × i after charging (ST0). Therefore, even when one room is air-conditioned with i devices, there is no adverse effect that i devices enter the control mode at the same time and the temperature of the room changes greatly.
[0043]
As described above, in the power control device 1, the operation history data is stored in the EEPROM 23 while appropriately forcibly shutting off the compressor with a time limit of 30 minutes. As described above, since the operation history data is stored in the non-volatile memory in this apparatus, the data can be reliably retained even after the power is turned off. When necessary, the operation history data can be transmitted to a notebook computer or the like.
[0044]
FIG. 8 is a flowchart illustrating a processing program for transmission of operation history data. In this embodiment, when the serial communication unit 25 finishes receiving one byte of serial data, a reception interrupt occurs to the CPU 27. On the other hand, when the serial communication unit 25 finishes sending one byte of serial data, A transmission interrupt is generated.
[0045]
First, the reception interrupt in FIG. 8A will be described. Data acquisition software is installed on the notebook computer, and management data including the start (start date) and end (last date) of the history data is acquired via the RS232C port when the operation history data is acquired. Are configured to transmit. These are transmitted as character data (for example, ASCII data). Each time the serial communication unit 25 of the power control apparatus 1 receives 1-byte data, the CPU 27 interrupts the process being executed at that time, and the reception interrupt process of FIG.
[0046]
In the reception interrupt process, first, after the register is saved (ST31), it is determined whether or not the received data is the final data (ST32). The received data such as the beginning and end of the history data is transmitted as character data, so that the end of the transmitted data can be notified by appropriate control data other than character data.
[0047]
If the result of determination in step ST32 is that character data has been received, it is sequentially stored in the reception buffer area of the memory (ST33), the register is restored (ST34), and the interrupt process is terminated. If such reception processing is repeated several times, control data indicating completion of transmission is eventually transmitted from the notebook computer. In this case, the operation history to be transmitted is analyzed by analyzing the data in the reception buffer area. Data is prepared (ST35).
[0048]
Specifically, the data to be transmitted among the operation history data stored in the EEPROM 23 is specified. FIG. 8C schematically shows the relationship between the operation history data string requested from the notebook personal computer, the pointer PNT indicating the memory address, and the final address END of the requested data. is there.
[0049]
When the preparation of data to be transmitted is completed, the CPU 27 transmits 1-byte data to the notebook computer and then ends the interrupt process (ST37). The 1-byte data is transmitted bit by bit while being converted into a serial signal. However, when transmission of 8-bit data is completed, a transmission completion interrupt is generated in the CPU.
[0050]
FIG. 8B illustrates a processing program by a transmission completion interrupt. When the transmission of the first 1-byte data described above is completed and the CPU is interrupted, the CPU 27 interrupts the process being executed at that time, and first saves the register (ST41). Then, it is determined whether or not the value of the pointer PNT exceeds the final address END (ST42), and if PNT ≦ END, 1 byte indicated by the pointer PNT is output from the accumulated operation history data (ST43). This data is transmitted as serial data from the serial communication unit 25 to the notebook computer.
[0051]
Next, after updating the pointer PNT by +1 (ST44), the register is restored and the interrupt process is completed (ST45). Thereafter, when transmission of 1-byte serial data is completed, a transmission completion interrupt is generated, and thus the processes of steps ST41 to ST45 are repeated. In this way, when the operation history data is transmitted to the notebook personal computer for each byte, PNT> END is eventually satisfied (ST42). In this case, the process is terminated without transmitting the data. As a result, no transmission completion interrupt occurs thereafter.
[0052]
Since the operation history data accumulated in the power control apparatus 1 can be transmitted to other devices at any time as necessary, the received power history data is appropriately edited in the power device 2 to be controlled. It is possible to grasp at a glance how much power has been saved. FIG. 11 is a table listing the operating hours of the power equipment to be controlled for one month. The operating time is based on the value of the variable TIME, the control time is based on the value of the variable CUT, and the stop time is based on the value of the variable CTL. The product of the count value accumulated for 30 minutes and the interrupt interval of 10 seconds is Are listed.
[0053]
FIG. 12 is a list showing the total amount of power that has been reduced by operating power and demand control and totaled for one month. The operating electric energy is based on the value of the variable W, and the electric energy [KWh] actually used for 30 minutes is illustrated based on the measured value. On the other hand, the control power amount is the amount of power that would have been consumed if this apparatus was not used. Specifically, based on the actual power consumption P for 30 minutes and the actual operation time t (seconds), the average power consumption P / t is obtained, and the control time (the value of the variable CUT) ).
[0054]
As mentioned above, although the Example of this invention was described concretely, the concrete description content does not limit this invention at all. In particular, the specific content of transmission / reception of operation history data using the RS232C port is of course improved as appropriate, and the RS232C port is merely an example.
[0055]
In the above embodiment, an EEPROM (particularly a flash memory) is used as the nonvolatile memory, but it is also preferable to use a so-called memory card. Here, the memory card is a general term for a stamp size IC card, but it is detachable, so that it can collect operation history data without connecting a notebook personal computer, which is very suitable. FIG. 10 illustrates an embodiment using a memory card, and there is no need to provide a serial communication unit as in the first embodiment.
[0056]
【The invention's effect】
As described above, according to the present invention, it is possible to realize an electric power control apparatus that can easily grasp the effect of demand control numerically while simplifying data collection and aggregation.
[Brief description of the drawings]
FIG. 1 illustrates a connection relationship between a power control apparatus according to an embodiment and a power device to be controlled.
2 is a block diagram showing an internal configuration of the power control device of FIG. 1;
FIG. 3 is a block diagram showing in detail a central processing unit of FIG. 2;
4 is a front view of the power control device of FIG. 1. FIG.
FIG. 5 is a flowchart illustrating a main process of the power control apparatus.
FIG. 6 is a flowchart showing a part of FIG. 5 in detail.
FIG. 7 is a flowchart illustrating timer interrupt processing of the power control apparatus.
FIG. 8 is a flowchart illustrating reception interrupt processing and transmission completion interrupt processing of the power control apparatus.
FIG. 9 is a time chart for explaining the operation of the air conditioner in an uncontrolled state.
FIG. 10 is a block diagram illustrating a central processing unit according to a second embodiment.
FIG. 11 is a list showing operation statuses in an aggregated manner.
FIG. 12 is a list showing operation statuses in an aggregated manner.
[Explanation of symbols]
2 Electric power equipment
1 Power control device
ST1 to ST9 main processing
ST20 to ST28 Timer interrupt processing
ST21 First process
ST23 Second process
ST26, ST27 Third process

Claims (6)

A power control device that is connected to each power device and forcibly cuts off the operation of the power device to perform demand control,
A main process repeatedly executed in an infinite loop after the power is turned on, and a timer interrupt process that is interrupted to start the main process at regular intervals,
The timer interrupt process includes a first process for substantially detecting instantaneous power supplied to the power device, and a cumulative value of the number of times when a significant value is detected in the first process. Two processes and a third process that cumulatively counts the number of times depending on whether or not the current power is being forcibly cut off when no significant power is detected in the first process , Obtain the power consumption of the power device, the total operation time, the total forcible cut-off time, the total stop time that is not forcibly cut off,
Based on the actual power consumption determined based on the power consumption and the actual operating time, the average power consumption is calculated, and this is multiplied by the control time determined based on the total forced cutoff time. A power control apparatus capable of calculating a control power amount reduced by demand control .   The power control apparatus according to claim 1, wherein the power control apparatus is configured not to forcibly cut off until a predetermined time or more elapses after the power device shifts to an operating state.   The power control apparatus according to claim 1, wherein the second process further includes a process of cumulatively adding the detection value detected by the first process to a past detection value.   The power control apparatus according to any one of claims 1 to 3, wherein the count result of the first process and the count result of the third process are stored in a nonvolatile memory at predetermined time intervals.   The power control apparatus according to claim 4, further comprising a communication unit with an external device, wherein the data in the nonvolatile memory is read out and transmitted to the external device based on a command from the external device. A power control device that is connected to each power device and forcibly cuts off the operation of the power device to perform demand control,
A demand control process that is repeatedly executed in an infinite loop after power-on, and a timer interrupt process that is started at regular intervals without being directly related to the demand control process,
In the timer interrupt process, the power consumption of the power device , the total operating time , the total forced cutoff time , and the total stop time that is not forcibly blocked are measured, and information based on the measurement result is stored in a nonvolatile storage element. has been way,
Based on the actual power consumption determined based on the power consumption and the actual operating time, the average power consumption is calculated, and this is multiplied by the control time determined based on the total forced cutoff time. A power control apparatus capable of calculating a control power amount reduced by demand control .

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