JPH0226295A - Air-conditioner controller - Google Patents

Abstract

PURPOSE:To regulate a working power surely through a simple operation without stopping an inverter apparatus by reducing an operating frequency uniformly, when there is a possibility that a contract demand is exceeded. CONSTITUTION:A demand monitoring part 13 detects by a watthour meter 12 that there is a possibility of the total working power of a plurality of air conditioners exceeding a contract demand. A plurality of inverter apparatus 241-24n are controlled by a central supervisory controller 1 and normally on the basis of an operating frequency command value. When there is a possibility that the total working power exceeds a contract demand, said operating frequency command value is reduced uniformly and said plurality of inverter apparatus 241-24n are controlled on the basis of the reduced operating frequency command value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner control device for a fan device such as an air handling unit having an air volume blowing function.

In particular, the present invention relates to an air conditioner control device that can realize energy savings and comfort by controlling the rotation speed of fan devices of a plurality of air conditioners.

[Prior art] In conventional air conditioner control, a target temperature is set in advance on a temperature setting device, a fixed differential zone is set at this temperature, and when the temperature rises above the upper limit, the fan device is operated. , and when the temperature dropped below the lower limit, the fan device was stopped.

Additionally, for the purpose of saving energy, there is a control called duty cycle control in which the fan device is operated intermittently. This duty cycle control attempts to reliably save energy by forcibly repeating operation and stopping at fixed time intervals. However, although duty cycle control can save energy, if the air conditioner is stopped for too long, the room temperature will rise too much in the summer, and the room temperature will drop too much in the winter, impairing comfort.

On the other hand, inverter control eliminates the above-mentioned operation/stopping of the air conditioner and uses an inverter to continuously control the rotation speed of a fan device to continuously vary the air volume, thereby achieving both energy savings and comfort. For example,
In building equipment, hot water and cold water are produced using boilers and refrigerators, and this hot water and cold water are sent to air handling units on each floor, flowed through fan coils installed there, and are blown with air by fan devices. It is designed to blow hot or cold air into each room. Therefore, in order to save energy throughout the building, it is necessary to manage the entire building. In particular, if the power consumption is about to exceed the contract power agreed with the electric power company, it is necessary to issue an early warning and control the fan device to reduce its rotational speed and reduce the power consumption all at once. However, the above-mentioned inverter control was performed only for each inverter.

[Problem to be solved by the invention] In the conventional air conditioner control device as described above, when there is a possibility that the power consumption exceeds the contracted power, the temperature is controlled individually, so load control is carried out to reduce the power consumption. For example, in order to
There was a problem in that it was difficult to understand how much power consumption could be reduced by 1ilJ tM.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an air conditioner control device that can reliably adjust the power consumption with a simple operation when controlling a plurality of air conditioners.

[Means for Solving the Problems] An air conditioner control device according to the present invention includes the following means.

(a) Input means for inputting operating frequency command values of a plurality of inverter devices, information indicating that the total power consumption of a plurality of air conditioners is likely to exceed the contracted power, and a multiplication rate.

(B) 1 In normal times, the plurality of inverter devices are controlled based on the operating frequency command value, and when the above information is input, the operating frequency command value is calculated using the multiplication factor and uniformly reduced. Control means for controlling the plurality of inverter devices based on the operating frequency command value.

[Operations] In this invention, the plurality of inverter devices are normally controlled by the control means based on the operating frequency command value input by the input means.

In addition, if information indicating that the total power consumption of multiple air conditioners is likely to exceed the contracted power is entered, the above operating frequency command value is calculated using a multiplication factor and the operation frequency is reduced uniformly. The plurality of inverter devices are controlled based on the frequency command value.

[Example] The configuration of the embodiment will be explained with reference to FIG.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, the control means are (1), (10), (14
) and (15), and the input means are (11) and (12).
> and (13).

In this embodiment, (1) is a central supervisory control section, which includes a transmission section (2), a CPU section (3), and a program memory section (4).
), data memory section (5), CRT interface section (
6), a video memory section (7), a keyboard interface section (8), and an alarm signal input section (9), which are connected to each other via a bus (1a).

Further, (10) is a CRT display connected to the CRT interface section (6), (11) is a keyboard connected to the keyboard interface section (8), and (12) is a CRT display connected to the CRT interface section (6).
is a power meter, (13) is a demand power monitoring section connected to this power meter (12), and (14) is a transmission line connecting the transmission section (2) and the transmission section (16). . The keyboard (11) includes a -simultaneous change key, a change key for each inverter device, a release key, an X95% key which is a multiplication rate key, and an X
A 90% key, an X85% key, an X80% key, etc. are provided.

(15) is an inverter υ control section, and a transmission section (16
), CPU section (17), program memory section 18),
Data memory section (19), A/D conversion section (20,) - (
20n>, input section (211)...(21n), D/A
Conversion section (22,)-(22n) and output section (23,)・
... (23n) and are connected to each other via a bus (15a).

In addition, (24+h・(24n) is the A/D converter (20
,)-...(2On), input section (21+)-(21n
), the inverter device (25,)...(25n) connected to the D/A conversion section (22+)...(22n) and the output section (231)...(23n), the inverter device (
24,)...(24n) is a fan device connected to the fan device. Although not shown, a plurality of other inverter control units are also connected to the transmission line (14).

Next, the operation of the above embodiment will be explained with reference to FIGS. 2 to 4. Figures 2, 3, and 4 show the main program registered in the program memory section (4) of the central monitoring control section (1) and the inverter control section (15).
FIG. 3 is a flowchart showing a control program registered in the program memory section (18) and a simultaneous change program registered in the program memory section (4).

First, the operation of the central supervisory control section (1) will be explained with reference to FIG. In step (30), the central supervisory control unit (1) starts operating.

In step (31), the central supervisory control unit (1)
Set the operating frequency command value, etc.

That is, through the keyboard interface unit (8), the operating frequency command value for each inverter device (241)...(24n) keyed in by the keyboard (11), the local/on-site operation mode, and the calculations described later are input. Enter the multiplication rate, etc. to be used. Then, they are stored in the data memory section (5).

In step (32), the central supervisory control unit (1)
Determine whether there is a change in the operating frequency command value, etc.

If there is no change (NO), proceed to step (34).
If there is a change (YES), proceed to the next step (33)
Proceed to.

That is, it is determined whether the change key on the keyboard (11) has been pressed.

In step (33), the central supervisory control unit (1)
Change the operating frequency command value, etc.

That is, the corresponding inverter device (24+)...(24n) keyed in with the keyboard (11) for change via the keyboard interface unit (8).
Input the operating frequency command value, local/on-site operation mode, etc. Then, they are stored in the data memory section (5).

In step (34), the central supervisory control unit (1) displays the operating frequency command value and the like.

That is, the CRT interface section (6) receives the operating frequency command value for each inverter device f(241)...(24n) written from the data memory section (5) to the video memory section (7), The operating mode etc. at the site is displayed on the CRT display (10).

In step (35), the central supervisory control unit (1)
The operating frequency command value etc. are transmitted to the inverter control section (15).

That is, the transmission unit (2) connects each inverter device (241
)...(24n) The data such as the operating frequency command value and the local/on-site operation mode are transmitted to the transmission section (16) via the transmission line (14).

In step (36), the central supervisory control unit (1)
The operating frequency etc. are received from the inverter control section (15).

In other words, the transmission section (2) connects each inverter device (24l
>...(24n) data such as operating frequency and fault signal are received from the transmission section (16) via the transmission line (14) and stored in the data memory section (5).

In step (37), the central supervisory control unit (1)
Determine whether there is a failure. If there is no failure (NO
), proceed to step (39). If there is a failure (YE
S) proceeds to the next step (38).

That is, it is determined whether each inverter device (241)...(24n) is in failure based on the data of the failure signal.

In step (38), the central supervisory control unit (1)
Handle the failure.

That is, the corresponding inverter device (241)...(24
n) is out of order in the video memory section (
7).

In step (39), the central supervisory control unit (1)
Displays operating frequency, etc.

That is, the CRT interface section (6) uses the operating frequency, etc. of each inverter device (241>... If there is, it is displayed on the CRT display (10) along with a message to the effect that it is out of order.Then, the process returns to step (32).

Next, the operation of the inverter control section (15) will be explained with reference to FIG. In step (40), the inverter control section (15) starts operation.

In step (41), the inverter control section (15)
receives the operating frequency command value etc. from the central supervisory control unit (1).

That is, the transmission section (16) connects each inverter device (24
1)...(24n) Receives data such as the operating frequency command value and local/on-site operation mode via the transmission line (14), and stores them in the data memory section (19).

In step (42), the inverter control section (15)
transmits the operating frequency command value, etc. to the inverter device (24,).
...Output to (24n).

That is, each operating frequency command value is determined by the D/A converter (22+
)...(22n) to the inverter device (241)
... (24n), and the frequencies of these inverter devices F (24,) ... (24n) are controlled.

In addition, the operation mode signal is output from the output section (231)...(23
n) via the inverter device (241)...(24n
), and these inverter devices (24+)...
- The operation mode of (24n) is controlled. This operation mode signal is a contact signal, and for example, when it is ON, it represents the hand mode, and when it is OFF, it represents the field mode.

In step (43), the inverter control section (15)
is the operating frequency etc. of the inverter device (241>...(
24n).

That is, the inverter device 1F (241)...(24n) via the A/D converter (20+)...(20n)
The operating frequency is input. This operating frequency is, for example, an analog signal of DC 2 to 20 mA.

Further, failure signals of the inverter devices (241)...(24n) are inputted via the input units (21,)...(21n). This failure signal is a contact signal indicating the presence or absence of a failure.

In step (44), inverter control section (15
) transmits the operating frequency etc. to the central supervisory control unit (1).

That is, the transmission section (16) transmits data such as the operating frequency and failure signal for each of the above-mentioned inverter devices (24+)...(24n) to the transmission section (2) via the transmission line (14). . Then, the process returns to step (41).

In this way, the central supervisory control unit (1) controls each inverter device (24,)...(2) via the inverter control unit (5).
4n) is centrally monitored and controlled.

Next, the operation of changing the operation frequency command value, etc. all at once is performed in the fourth step.
This will be explained with reference to the figures.

The power demand monitoring unit (13) inputs the transmitted pulses from the watt-hour meter (12), counts the transmitted pulses, and detects the total amount of power used by all the air conditioners. Here, if there is a risk that the counted value of the transmitted pulses will exceed the contract power agreed upon in advance with the electric power company (for example, when the total power consumption reaches 95% of the contract power), an alarm signal is sent. The alarm signal input section (9) of the central monitoring and control section (1)
Output to.

When the alarm signal input section (9) detects an ON alarm signal,
In step (50), the central supervisory control unit (1)
−Start the simultaneous change operation.

In step (51), the central supervisory control unit (1)
Save the operating frequency command value, etc.

That is, the data such as the operating frequency command value and local/on-site operation mode for each inverter unit N(24+)...(24n) stored in the data memory section (5) is transferred to the evacuation area and stored. do. Note that the save area is provided at another memory address in the data memory section (5).

In step (52), the central supervisory control unit (1)
Set the operation mode to hand mode.

That is, each inverter device (24,)...(24n
) Set all operating modes to the hand mode and write the data to the data memory section (5).

In step (53), the central supervisory control unit (1)
The displayed operating frequency is set as the operating frequency command value.

That is, the data memory section (5) uses the operating frequency of each inverter device (241)...(24n>) displayed on the CRT display (10) as an operating frequency command value.
write to.

In step (54), the central supervisory control unit (1)
Calculate and update the operating frequency command value.

That is, the operating frequency command value is calculated based on the loss factor stored in the data memory section (5).

For example, if the loss rate is x90%, each operating frequency command value is multiplied by x0.9, this calculation result is written anew into the data memory section (5) as the operating frequency command value, and the ON While the alarm signal is input, each current operating frequency command value is multiplied by the loss rate at fixed time intervals (for example, every minute), and each operating frequency command value is updated each time.

In step (55), the central supervisory control unit (1)
- Determine whether the change is to be canceled or not. If not canceled (
NO), return to step (54). In case of cancellation (YE
S) proceeds to the next step (56).

That is, it is determined whether an OFF alarm signal has been input from the power demand monitoring section (13) via the alarm signal input section (9).

In step (56), the central supervisory control unit (1)
-Restore the operating frequency command value, etc. before the change.

That is, the data such as the operating frequency command value, local/on-site operation mode, etc. for each inverter device<241)...(24n) before the simultaneous change stored in the evacuation area is stored in the data memory section (5). Transfer and write to the area.

In step (57), the central supervisory control unit (1)
- Finish the simultaneous change operation.

In this way, the central supervisory control unit (1) automatically sets the operation mode of all air conditioners to the on-hand mode and automatically controls each inverter device (24
1) Control the operating frequency of (24n) to be uniformly lowered.

Here, an alarm signal input section (9), a power demand monitoring section (13)
) is omitted. Another embodiment will be described.

In other embodiments, the control means (1), (10), <
14) and (15), and the input means is <11).

First, when there is a risk that the total power used by all air conditioners exceeds the contracted power, the power demand monitoring unit (9) monitors the power used instead of outputting an ON alarm signal. The - change key on the keyboard (10) is pressed by an operator or the like.

Similarly, instead of outputting the OFF alarm signal, the release key is pressed.

Furthermore, until the OFF alarm signal is output, instead of calculating the operating frequency command value with the same loss rate, the weight keys (×95% key, ×90% key×85% key, ×
80% key, etc.) is pressed.

In the above embodiment, the program is registered in the program memory section from the beginning, but by connecting a floppy disk, hard disk, bubble memory, etc. in which the program is stored, the program can be stored in the program memory section composed of RAM. You can expect the same behavior even if you load it.

In addition, in the above embodiment, data is sent and received via a transmission unit, a transmission line, etc., but these are omitted, and an A/D conversion unit, a D/A conversion unit provided in an inverter control unit, Similar operation can be expected even if the input section, output section, etc. are provided in the central monitoring control section.

Incidentally, in the above explanation, the case where the present invention is used for controlling an air conditioner has been described, but it goes without saying that the present invention can also be used for controlling other devices.

[Effects of the Invention] As explained above, the present invention provides operating frequency command values for a plurality of inverter devices, information indicating that the total power consumption of a plurality of air conditioners is likely to exceed the contract power, and a loss ratio. and an input means for inputting the operating frequency command value, which normally controls the plurality of inverter devices based on the operating frequency command value, and when the above information is input, calculates the operating frequency command value using the loss factor. Since it is equipped with a control means that uniformly reduces the operating frequency and controls the plurality of inverter devices described above based on the operating frequency command value, it can be used reliably with simple operation when controlling multiple air conditioners without stopping the inverter device. This has the effect of being able to adjust the power.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing a main program registered in the program memory section of the central supervisory control section, and FIG. 3 is a program memory section of the inverter control section. FIG. 4 is a flowchart showing a control program registered in the program memory section of the central supervisory control section. In the figure, (1)... Central supervisory control section, (2)... Transmission section, (3... CPU section, (4... Program memory section, (5)... Data memory section, (6... CRT interface section, (7... video memory section, (8... keyboard interface section, (9...
Alarm signal input section, (10) ... CRT display, (11)
... Keyboard, (12) ... Electric energy meter, (13) ... Power demand monitoring section, (14) ... Transmission line, (15) ... Inverter control section, (16) ...・ Transmission section, (17) ... CPU section, (18) ... Program memory section, (19) ・
・・Data memory section, (20+)-(20n)-
A/D converter, (21,), -, (21n) ,,
Input section, (22,) = (22n)...+
D/AyR exchange part, (231)...(23n)...
- It is an output section. In each figure, the same reference numerals refer to the same or corresponding parts.
Figure JP-A-2-26295 Figure 6, Description of contents of amendment, page 12, line 4 rD02-20'' 1, Indication of incident 1988 Patent Application No. 173973 2, Title of invention Air conditioner control device rD C4~20''. Relationship to the above 3° amendment cases Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent address Chiyoda, Tokyo 4th floor, Marunouchi Building, 2-4-1 Marunouchi Ward, subject to correction of 5°

Claims (1)

[Claims] Input means for inputting the operating frequency command value of multiple inverter devices, information indicating that the total power consumption of multiple air conditioners is likely to exceed the contracted power, and the multiplication factor, and the above operating frequency in normal times. When the above-mentioned plurality of inverter devices are controlled based on the command value, and the above-mentioned information is input, the above-mentioned operating frequency command value is calculated and uniformly reduced using the above-mentioned multiplication factor, and the above-mentioned plurality of inverter devices are controlled based on the operating frequency command value. An air conditioner control device comprising a control means for controlling an inverter device.