JP6328411B2 - Energy saving control device, air conditioning system including the same, energy saving control method and program - Google Patents

Description

  The present invention relates to an energy saving control device, an air conditioning system including the same, an energy saving control method, and a program.

With the recent increase in demand for energy saving, energy-saving operation is also required for air conditioners.
For example, in the following Patent Document 1, the set power consumption is obtained from the cut ratio, which is the ratio for suppressing the power consumption, with respect to the rated power consumption, and the sum of the current values of the compressor is calculated from the set power consumption. A configuration is described in which the current value of the compressor is controlled so as not to exceed the upper limit value.
Patent Document 2 below describes a configuration in which the air conditioning operation is stopped for a predetermined stop time and intermittent operation is performed regardless of the room temperature.

JP 2006-125661 A JP-A-9-292149

  However, the method of Patent Document 1 is controlled based on the rated power consumption, and there is a problem in that the power consumption cannot be reduced at a desired rate according to the operation state that changes every moment.

  The present invention has been made to solve the above-described problem, and an energy-saving control device capable of reducing power consumption at a desired rate according to the operating state of the air-conditioning device that changes from moment to moment, and an air-conditioning system including the same And an energy saving control method and program.

In order to solve the above problems, the present invention employs the following means.
The present invention relates to a current measuring means for measuring an input current input to an outdoor unit of an air conditioner including a compressor, a reduction command for reducing power consumption of the outdoor unit, and information on a reduction amount for reducing power consumption. Is acquired so as to alternately repeat a first period in which a current limit value is provided and the input current reduction control is performed, and a second period in which the input current reduction control is canceled at predetermined time intervals. Control means for controlling the compressor, the control means based on the input current measured by the current measuring means at the end of the second period and the ratio between the first period and the second period. Then, the current limit value in the next first period is set, and the current limit value is the sum of power consumption in the second period and the next first period when the power consumption is not reduced. Compared to the reduction amount Providing energy-saving control unit is set to reduced to values.

According to the present invention, the input current input to the outdoor unit of the air conditioner is measured, and when the reduction command for reducing the power consumption of the outdoor unit and the information on the reduction amount for reducing the power consumption are acquired, The compressor provided in the outdoor unit includes power consumption obtained by reducing a predetermined amount of current from the input current in the first period, and power consumption obtained by releasing the current control of the input current in the second period. Is controlled so as to be reduced from the power consumption before the reduction by the reduction amount specified by the reduction command, and the first period and the second period are controlled alternately.
As described above, the first period and the second period are repeated, and the second period for canceling the current control is provided after the first period under the current control. Therefore, the next first current is determined based on the input current value when the current control is not performed. Current control for a period can be performed, and power consumption can be reliably reduced with an instructed reduction amount with respect to an outdoor unit operating state that changes from moment to moment. Moreover, since the information on the measured input current is information acquired by the outdoor unit, no additional hardware is required for reducing power consumption, and it can be handled by changing the software.

  The present invention provides an energy saving control device, an outdoor unit of an air conditioner, a reduction command for reducing power consumption of the outdoor unit, and an external command device for outputting information on a reduction amount for reducing power consumption to the control means. An air conditioning system is provided.

The present invention includes a first step of measuring an input current input to an outdoor unit of an air conditioner including a compressor, a reduction command for reducing power consumption of the outdoor unit, and information on a reduction amount for reducing power consumption. Is acquired so as to alternately repeat a first period in which a current limit value is provided and the input current reduction control is performed, and a second period in which the input current reduction control is canceled at predetermined time intervals. have a second step of controlling the compressor, the ratio of the second step, the second period of the measured input current in the first step at the end, and the first period and the second period The current limit value in the next first period is set based on the current limit value, and the current limit value does not reduce the power consumption by summing the power consumption in the second period and the next first period. Compared to the case low Provides energy saving control method is set to a value which is reduced by an amount.

The present invention provides a first process for acquiring an input current input to an outdoor unit of an air conditioner including a compressor, a reduction command for reducing power consumption of the outdoor unit, and information on a reduction amount for reducing power consumption. Is acquired so as to alternately repeat a first period in which a current limit value is provided and the input current reduction control is performed, and a second period in which the input current reduction control is canceled at predetermined time intervals. An energy-saving control program for causing a computer to execute a second process for controlling a compressor , wherein the second process includes an input current acquired at the end of the second period, the first period, and the second period. The current limit value in the next first period is set based on the ratio to the period, and the current limit value is the sum of the power consumption in the second period and the next first period. When not reducing Providing energy-saving control program to be set to a value which is reduced by the reduction amount in comparison with.

  The present invention has an effect that power consumption can be reduced at a desired ratio according to the operating state of the air conditioner that changes from moment to moment.

It is a schematic block diagram of the air conditioning system which concerns on this invention. It is the figure which showed an example of the time tendency obtained by control of input current. It is the figure which showed an example of the time tendency of the power consumption obtained by control of input current. It is the state machine figure which showed the transition of the stop state from the start state of the air conditioning system which concerns on this invention.

  Hereinafter, an embodiment of an energy saving control device, an air conditioning system including the energy saving control device, an energy saving control method, and a program according to the present invention will be described with reference to the drawings.

An air conditioning system 1 shown in FIG. 1 includes an energy saving control device 10, an external command device 6, and an outdoor unit 7 of the air conditioning device, and is connected to a power source 2.
The energy saving control device 10 includes a current sensor (current detection means) 3 and a controller (control means) 4.
The current sensor 3 measures an input current input from the power source 2 to the outdoor unit 7 of the air conditioner including the inverter compressor (compressor) 5. The current sensor 3 outputs information on the measured input current value to the controller 4.
The external command device 6 outputs to the controller 4 a reduction command (energy saving control command) for reducing the power consumption of the outdoor unit 7 and a reduction amount information for reducing the power consumption. The external command device 6 is provided with an input device (not shown) and the like, and a reduction command and a reduction amount can be input from the input device.
The inverter compressor 5 is a capacity control type compressor whose capacity can be varied in multiple stages by inverter control, and is controlled with the rotation speed as an operation amount.

  The controller 4 includes, for example, a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory), a computer-readable recording medium, and the like. A series of processing steps for realizing various functions to be described later are recorded in a recording medium or the like in the form of a program, and the CPU reads the program into a RAM or the like to execute information processing / arithmetic processing. Thus, various functions described later are realized. Specifically, the controller 4 acquires input current information and controls the inverter compressor 5 based on the acquired input current.

  More specifically, the controller 4 reduces the predetermined current amount from the measured input current when acquiring the reduction command for reducing the power consumption of the outdoor unit 7 and the information on the reduction amount for reducing the power consumption. In this way, the period for controlling the inverter compressor 5 is defined as the first period (current limiting state), the period for canceling the input current reduction control is defined as the second period (current non-limiting state), and the first period and the second period A first period in which a predetermined current amount for reducing the total power consumption is reduced by the reduction amount notified together with the reduction command than when power consumption is not reduced and the input current is reduced by the determined predetermined current amount And the inverter compressor 5 are controlled so as to alternately repeat the second period.

  In addition, the second period is a period provided for grasping the current operation state of the outdoor unit 7, and by having the second period, a command to reduce the input current due to continuation of the operation of the outdoor unit 7 is provided. It is possible to reliably reduce the amount of power consumption indicated by. In addition, although the 1st period and 2nd period in this embodiment are made into a period of about 5 minutes, for example, according to the rotation speed control rate of the inverter compressor 5 of the outdoor unit 7 in the 1st period and the 2nd period. Is set.

  FIG. 2 shows time on the horizontal axis and the input current value [A] measured by the current sensor 3 on the vertical axis. The solid line shows an example of the time trend of the input current after control by the air conditioning system 1 according to the present embodiment, and the dotted line is the time trend of the input current when no control is applied. T1 in FIG. 2 indicates a first period during which the input current is limited (reduction control), and T2 indicates a second period during which the input current is limited (reduction control).

  In the present embodiment, a first period T1 in which the operation is performed by reducing the predetermined current amount from the measured input current value, and a second period in which the operation is performed by releasing the current restriction from a state in which the predetermined current amount is reduced. The case where T2 is an equal time interval will be described as an example, but the present invention is not limited to this.

When the outdoor unit 7 of the air-conditioning apparatus is in operation at time t0, and information indicating a power consumption reduction amount (for example, 10%) is input to the controller 4 together with a power consumption reduction command at time t1. In the controller 4, the input current is determined as applying a current limit by a double reduction amount (for example, 2 × 10% = 20%). Here, the reason why the reduction amount of the input current is doubled is that the first period T1 for limiting the current of the input current and the second period T2 for canceling the current limit are equal time intervals.
The controller 4 controls the rotation speed of the inverter compressor 5 so that the input current is reduced by a predetermined current amount (for example, 20%) from the measured input current value.

  When the current limit is released and the inverter compressor 5 is controlled at time t2 after the first period T1 has elapsed since the start of the input current limit, the input current value gradually recovers. Since the current operating state (input current) of the outdoor unit 7 is measured at time t3 after the elapse of the second period T2 after the current limit is released, the input current measured by the current sensor 3 at the timing of time t3. Based on the above, it is possible to set a predetermined current amount (current limit value) for reducing the input current in the next first period (that is, from time t3 to time t4).

Here, since the power consumption can be expressed as power consumption = current × voltage × power factor, it is assumed that the voltage and power factor are constant, and thus the first period T1 and the second period T2 are alternately alternated. As shown in FIG. 3, the controller 4 instructs the inverter compressor 5 to indicate the rotational speed, so that the power consumption tendency as shown in FIG. 3 is obtained.
The horizontal axis of FIG. 3 shows time, and the vertical axis shows power consumption [W]. The solid line shows an example of the time trend of power consumption after control by the air conditioning system 1 according to the present embodiment. The dotted line is the time trend of the power consumption when the control is not applied, and the alternate long and short dash line indicates the power consumption reduced by the reduction amount (for example, 10%) instructed by the reduction command. Indicates the reduced power consumption for 10%.

  As shown in FIG. 3, the power consumption that has not been reduced in the hatched area in the second period T2 from time t0 to time t1 is the reduced power consumption in the hatched area in the first period T1 from time t1 to time t2. The amount of reduced power consumption from the one-dot chain line to the solid line portion of the first period T1 from time t1 to time t2 (power consumption reduced by more than 10% reduction by the reduction command) is This corresponds to the unreduced power consumption of the solid line portion from the one-dot chain line in the second period T2 from the time t2 to the time t3. In the present embodiment, the first period T1 and the second period T2 are reduced by reducing the amount of current that is a reduction amount (for example, 20%) that is twice the reduction amount (for example, 10%) instructed by the reduction command. The total amount of power consumption during the total period is reduced by the reduction amount instructed by the reduction command.

  As described above, in the period of the second period T2 in which the current restriction is released, the input current that is the current operation state input to the outdoor unit 7 is detected, and based on the input current measured in the second period T2. Since the current limitation of the next first period T1 is performed, by alternately providing the first period T1 and the second period T2, the power consumption can be reduced following the operation state of the air conditioner that changes from moment to moment. It is possible to reliably reduce by the reduction amount instructed to reduce.

Below, the effect | action of the controller 4 of the air conditioning system 1 which concerns on this embodiment is demonstrated using FIGS. 1-4.
When the outdoor unit 7 of the air conditioner is in operation, and when the energy saving control start command (reduction command) and the amount of reduction of power consumption are input from the external command device 6 to the controller 4, the energy saving control operation starts. Is done. Based on the input current of the outdoor unit 7 detected by the current sensor 3 at the timing when the energy saving control operation is started, the reduction of the predetermined current amount is started from the input current value, and the state is shifted to the current limit state. At this time, the predetermined amount of current to be reduced is set according to the first period T1 and the second period T2 determined based on the model of the outdoor unit 7 and the like.

  The controller 4 controls the rotational speed of the inverter compressor 5 so that the input current of the outdoor unit 7 is reduced by a predetermined amount of current from the input current value before reduction. When the count of the T1 timer that measures (manages) the first period T1 ends (the first period T1 expires), the state shifts to a current non-limit state. In the current non-limit state, the current limit of the input current is released, and when the count of the T2 timer that measures (manages) the second period T2 ends (the second period T2 expires), the current limit state is entered.

  The current limit state and the current non-limit state are repeated until an energy saving control release command (release command for releasing the reduction command) is acquired or until an operation stop instruction for the outdoor unit 7 is acquired. When the energy-saving control cancellation command is acquired from the external command device 6 or when the outdoor unit 7 is stopped, the energy-saving control operation state is ended, and this processing is ended.

  As described above, according to the energy saving control device 10 according to the present embodiment, the air conditioning system 1 including the energy saving control device 10, the energy saving control method, and the program, the input current input to the outdoor unit 7 of the air conditioning device is measured. The inverter compressor 5 provided in the outdoor unit 7 is predetermined from the input current measured in the first period T1 when the reduction command for reducing the power consumption of the outdoor unit 7 and the information on the reduction amount are acquired. The total of the power consumption obtained by reducing the current amount and the power consumption obtained by releasing the current control of the input current in the second period T2 is reduced by the reduction amount specified by the reduction command. It is controlled to be reduced from the previous power consumption.

  Thus, based on the measured input current, the inverter compressor 5 is controlled so as to repeat the first period T1 and the second period T2, and a predetermined value corresponding to the operating state of the outdoor unit 7 that changes from moment to moment. Since the reduced current amount is set at the timing when the second period T2 expires, the power consumption can be reliably reduced by the instructed reduction amount. Moreover, since the information on the measured input current is information acquired by the outdoor unit, no additional hardware is required for reducing power consumption, and it can be handled by changing the software.

  In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary, it can change suitably.

DESCRIPTION OF SYMBOLS 1 Air conditioning system 2 Power supply 3 Current sensor (current detection means)
4 Controller (control means)
5 Inverter compressor (compressor)
6 External command device 7 Air conditioner outdoor unit 10 Energy-saving control device

Claims (4)

Current measuring means for measuring an input current input to an outdoor unit of an air conditioner including a compressor;
A first period in which when a reduction command for reducing the power consumption of the outdoor unit and information on a reduction amount for reducing the power consumption are acquired, a current limit value is provided to perform reduction control of the input current; and the input current Control means for controlling the compressor so as to alternately repeat a second period for releasing the reduction control at predetermined time intervals ,
The control means is configured to limit the current limit in the next first period based on the input current measured by the current measuring means at the end of the second period and the ratio between the first period and the second period. A value is set, and the current limit value is set to a value that reduces the total power consumption of the second period and the next first period by the amount of reduction compared to a case where the power consumption is not reduced. that energy-saving control device. An energy-saving control device according to claim 1;
An air conditioner outdoor unit,
An air conditioning system comprising: a reduction command for reducing power consumption of the outdoor unit, and an external command device for outputting information on a reduction amount for reducing power consumption to the control means. A first step of measuring an input current input to an outdoor unit of an air conditioner including a compressor;
A first period in which when a reduction command for reducing the power consumption of the outdoor unit and information on a reduction amount for reducing the power consumption are acquired, a current limit value is provided to perform reduction control of the input current; and the input current a second period for releasing the control of reducing have a second step of controlling the compressor to repeat alternately at predetermined time intervals,
In the second step, the current in the next first period is based on the input current measured in the first step at the end of the second period and the ratio between the first period and the second period. A limit value is set, and the current limit value is set to a value that reduces the total power consumption of the second period and the next first period by the amount of reduction compared to a case where the power consumption is not reduced. energy-saving control method. A first process of acquiring an input current input to an outdoor unit of an air conditioner including a compressor;
A first period in which when a reduction command for reducing the power consumption of the outdoor unit and information on a reduction amount for reducing the power consumption are acquired, a current limit value is provided to perform reduction control of the input current; and the input current An energy saving control program for causing a computer to execute a second process for controlling the compressor so as to alternately repeat a second period for releasing the reduction control at predetermined time intervals ,
The second process sets the current limit value in the next first period based on the input current acquired at the end of the second period and the ratio between the first period and the second period, The energy-saving control program in which the current limit value is set to a value that reduces the total power consumption of the second period and the next first period by the amount of reduction compared to a case where the power consumption is not reduced .

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