JPH06249483A - Simultaneous starting preventive method for plural air conditioning devices - Google Patents

Abstract

PURPOSE:To prevent the duplicate starting of respective air condition devices from happening regardless of the operation mode for a plurality of air condition ing devices which jointly use a power source with a limited capacity. CONSTITUTION:A time differential value of a common bus bar current IL which is detected by a current detector 6 is operated by a differential operator 11, and the current differential value is larger than a specified value or not is compared by a comparator 12, and when it is larger than the specified value, a signal SC1 is output. Then, an interlocking circuit 5A is constituted in such a manner that a signal SL1 is output by a timer 13 after an estimated period of time which is considered to be required for the start transient condition of the air conditioning device to be damped sufficiently has passed from the time when the signal SC1 is received, and the start commands to respective air conditioning devices are locked so that any of other air conditioning devices may not be started during the continuation of the signal SL1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to starting control of a plurality of air conditioners using a limited capacity power source such as an auxiliary power source device for railroad vehicles as a common power source, in conjunction with simultaneous activation or time-dependent overlapping activation of each air conditioning device. The present invention relates to a method for preventing simultaneous activation of a plurality of air conditioners, which is performed in order to avoid an inoperable state of each air conditioner due to a total activation capacity exceeding a transient allowable capacity of the common power supply.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing simultaneous activation of a plurality of air conditioners using a limited capacity power source as a common power source, the time considered to be the end of the start transient state relating to the start current of each air conditioner is It is known to perform sequential activation with the interval between activation commands for each air conditioner.

[0003]

According to the sequential activation control for a plurality of air conditioners, mutual activation is avoided during normal activation of each of these air conditioners, and the activation of all air conditioners is completed. The required activation capacity does not exceed the transient permissible capacity of the common power supply at any point in the time zone, and the sequential activation of each air conditioner is normally completed.

On the other hand, once the air conditioner has completed its startup, it automatically enters into an automatic operation in which it independently and randomly stops and restarts in accordance with a command signal from a temperature sensor or the like. There is a possibility that the restart of the preceding air-conditioning system that was in automatic operation after being stopped once may overlap with the startup of the following air-conditioning system that is being started according to the sequential startup program, and there may be the worst situation in which all the air-conditioning systems start up again It will be.

However, in the above-mentioned conventional simultaneous start-up prevention method, the lock protection against the repeated start-up of the air conditioner being restarted by the automatic operation and the following air-conditioner being started according to the sequential start program is not provided. However, there is a possibility that the start-up or operation of each of the air conditioners cannot be continued due to an overcurrent protection operation or the like due to the total start-up capacity accompanying the redundant start-up exceeding the transient allowable capacity of the common power supply.

In view of the above, according to the present invention, in the operation of a plurality of air conditioners in which a limited capacity power source is used as a common power source, redundant start-up requiring an excessive start-up capacity such that the transient allowable capacity of the common power source is exceeded in any state An object of the present invention is to provide a method for preventing simultaneous activation of a plurality of air conditioners that can prevent such a situation.

[0007]

In order to achieve the above object, a method for preventing simultaneous activation of a plurality of air conditioners according to the present invention detects currents of a common power supply path for a plurality of air conditioners, and detects the time of the detected currents. When the differential value is calculated and the time differential value is compared with a predetermined value, the current differential value becomes equal to or larger than the predetermined value. Locking the activation operation of the other air conditioner for a predetermined period from the time when the current differential value is equal to or more than the predetermined value, and if the current differential value is less than the predetermined value, the standby state The starting operation of the other air conditioner is performed according to the operation program, or the current differential value for forming the starting operation locking signal for the other air conditioner in the starting standby state as described above. Alternatively, the shall be used the peak value of the common feed line current.

[0008]

In operation of a plurality of air conditioners using a limited capacity power source as a common power source, either by program operation or by automatic operation by temperature response etc. until the start transient state of any one air conditioner is completed. By locking so that any other air conditioner, regardless of its type, will not be activated, it is possible to prevent redundant activation that requires an excessive activation capacity that exceeds the transient allowable capacity of the common power supply.

Therefore, in order to prevent the above-mentioned multiple activation of the air conditioners, it is necessary to detect the occurrence of a transient state at the time of activation of the air conditioners and to detect the end thereof. In relation to the above, the first aspect of the present invention is that the time differential value of the current of the common power supply path to the plurality of air conditioners becomes a predetermined value or more at the time of occurrence of the transient state accompanying the air conditioner startup. According to the second aspect of the present invention, the transient state is generated at a time point when the current peak value of the common power feeding path becomes a predetermined value or more. Further, in both of the above-mentioned inventions, regarding the end detection of the transient state, the end time of the transient state is defined as an elapsed time from a time when the transient state is generated to a time that is considered to be required for the transient state to be sufficiently attenuated. It is a thing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 5 is an example of a main circuit diagram of a multiple air conditioner operation system to which the present invention is directed, and illustrates a railway vehicle power supply device as a power supply with a limited capacity. 1 and 2 show a first embodiment of the present invention corresponding to the main circuit diagram of FIG. 5, and FIGS. 3 and 4 show a second embodiment of the present invention. is there.

First, in FIG. 5, 1 is an overhead wire, 2 is a current collector,
Reference numeral 3 denotes a power supply device that is mounted on the vehicle and that converts DC power supplied from the overhead wire 1 into AC power and outputs the AC power, and 4A to 4C are air conditioning devices that use the power supply device 3 as a common power supply. Further, 6 is a current detector for detecting the current I _L of the common power supply path to each of the air conditioners, and 5 is an output of the current detector 6 to determine the change state of the current I _L to restrict the operation of each of the air conditioners. It is an interlock circuit that outputs a command S _L.

Next, in FIG. 1, 5A is a specific example of the interlock circuit 5 in FIG. 5, and 11 is a current detector 6.
A differential calculator for calculating the time differential value of the current I _L detected via the comparator 12, and a comparator 12 for outputting the output signal S _C1 as a logical signal when the calculated current differential value becomes larger than a predetermined value. Is. A timer 13 outputs a signal S _L1 after a predicted time, which is considered to be required for the activation transient state of the air conditioner to be sufficiently attenuated, from the time when the output signal of the comparator 12 is received. .

Here, the signal S _L1 serves as an operation restriction command between the respective air conditioners, and while the signal S _L1 continues, other signals, regardless of whether the operation is a program operation or an automatic operation based on a temperature response, etc. It locks so that no air conditioner is activated. Next, FIG. 2 is an operation waveform diagram of related signals showing a formation state of the signal S _L1 by the interlock circuit 5A.

First, FIG. 2A shows each of the air conditioners 4A to 4C.
The current I _L is linearly increased / decreased in the case of sequential activation, and the fluctuation pattern is simulated and displayed. 2B shows a rectangular wave pulse-like change pattern of the time differential value dI _L / dt of the current I _{L which} changes as shown in FIG. 2A, and the pulse peak value is the current I _It is proportional to the slope of the change of _L with time. Here, the first aspect of the present invention is to consider the time when the gradient of the increasing current I _L becomes a predetermined value or more as the time when a transient state occurs due to the activation of the air conditioner. The reference value as shown in the figure is set on the positive side of 2 (b).

Further, FIG. 2C shows an output signal S _C1 of the comparator 12 which is output when the differential value of the current I _L becomes equal to or larger than the reference value shown in FIG. 2B. . Further, FIG. 2D shows an output signal S _L1 of the timer 13 which receives the signal S _C1 , and the signal S _L1 is the signal S _C1.
The output state is continued from the point of application of the above to the point of time when a predicted time required for the start-up transient state of the air conditioner to be sufficiently attenuated has elapsed.

Further, in FIG. 3, 5B is a specific example of the interlock circuit 5 in FIG. 5, and 22 is a current detector 6.
Is a comparator which outputs the output signal S _C2 as a logic signal when the peak value of the current I _L detected via the output signal S _L is larger than a predetermined value, and the timer 23 is the same output signal S as the timer 13. _It outputs _L2 . Next, FIG. 4 is an operation waveform diagram of related signals showing a formation state of the signal S _L2 by the interlock circuit 5B.

First, FIG. 4A shows each of the air conditioners 4A to 4C.
Is a simulated display of the variation pattern of the current I _L when sequentially activated. Here, the second aspect of the present invention is to consider the time point when the peak value of the current I _L is equal to or more than a predetermined value as the time point of occurrence of a transient state associated with the activation of the air conditioner. The reference value as shown is set on the positive side of (a).

Next, FIG. 4B shows the output signal S _C2 of the comparator 22 which is output when the peak value of the current I _L becomes equal to or higher than the reference value shown in FIG. 4A. is there. Further, FIG. 4C shows an output signal S _L2 of the timer 23 which has received the signal S _C2 . This signal S _{L2 is the} signal S _L1.
It has the same character as. By using the signal S _L1 or S _{L2 having} the above-mentioned character as an operation restriction command between a plurality of air conditioners, regardless of whether it is a program operation or an automatic operation by a temperature response,
It is possible to surely avoid redundant activation of the plurality of air conditioners.

[0019]

According to the present invention, the current of the common power supply path for a plurality of air conditioners is detected, the time differential value of the detected current is calculated, and the time differential value and the predetermined value are compared. If the current differential value is equal to or more than the predetermined value, the start operation of another air conditioner in a standby state to be subsequently activated is started from the time when the current differential value is equal to or more than the predetermined value. In the operation of the plurality of air conditioners in which the power source having the limited capacity is used as the common power source, the program is performed by locking the power source over the period or using the current peak value instead of the time differential value of the common power supply path current. Regardless of whether it is due to operation or automatic operation, it is possible to reliably prevent duplicated starting that requires an excessive starting capacity that exceeds the transient allowable capacity of the common power supply in any operating state. It is possible to improve the reliability of air conditioner operation by avoiding the operation stop of all air conditioners due to overload or overcurrent protection for the common power supply, and select the optimum common power supply rated capacity for the required air conditioning capacity. It is possible to deal with the situation and reduce the cost of the air conditioning operation system.

[Brief description of drawings]

FIG. 1 is an interlock circuit diagram showing a first embodiment of the present invention.

FIG. 2 is an operation waveform diagram of various signals corresponding to FIG.

FIG. 3 is an interlock circuit diagram showing a second embodiment of the present invention.

FIG. 4 is an operation waveform diagram of various signals corresponding to FIG.

[Fig. 5] Main circuit diagram of multiple air conditioner operation system

[Explanation of symbols]

 1 Overhead Line 2 Current Collector 3 Power Supply Device 4 Air Conditioner (4A, 4B, 4C) 5 Interlock Circuit (5A, 5B) 6 Current Detector 11 Differential Operator 12 Comparator 13 Timer 22 Comparator 23 Timer

Claims (2)

[Claims] 1. A current differential in a common power supply path for a plurality of air conditioners is detected, a time differential value of the detected current is calculated, and a magnitude comparison operation is performed between the time differential value and a predetermined value to obtain the current differential value. If the value exceeds the specified value,
The start operation of the other air conditioner in the standby state to be continuously started according to the operation program or the automatic operation condition is locked for a predetermined period from the time when the current differential value becomes the predetermined value or more, and the A method for preventing simultaneous activation of a plurality of air conditioners, characterized in that if the current differential value is less than the predetermined value, the operation of starting the other air conditioners in the standby state is performed according to the operation program. 2. The method for preventing simultaneous activation of a plurality of air conditioners according to claim 1, wherein the time of the common power supply line current for forming a start operation locking signal for another air conditioner in the start standby state as described above. A method for preventing simultaneous activation of a plurality of air conditioners, characterized in that the peak value of the common power supply line current is used instead of the differential value.