JPH0447229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply control device that controls the operation of a plurality of electrical devices including at least one refrigerator.

Electrical equipment includes not only regular lighting, blower motors, and hot water boilers, but also refrigeration units, refrigerators, air conditioning equipment, etc., and has power receiving equipment that can operate multiple of these electrical equipment in parallel. As an example, there is a large store 1 such as a supermarket or a department store as shown in FIG. This power receiving equipment connects the case refrigerator R ₁ ,
R ₂ ...R _K , R _K+1 ... R _o-1 , R _o , electrical equipment such as air conditioning refrigerator 3, cold storage refrigerator 4, lighting equipment 5, blower (not shown), etc. is in operation. has been done. or,
The refrigerating machine for the show case has a refrigeration cycle with a condenser 6 and a liquid receiver 7 so that one compressor _C1 cools three product compartments _L1 , _L2 , _L3 as shown in _R1 . A configuration in which two product storage sections L ₄ and L ₅ are connected to one compressor C ₂ as in R ₂ , and two compressors C ₃ connected in parallel as in R ₃ . , C ₃ ′ is configured to cool three product storage compartments L ₆ , L ₇ , L ₈ , and one compressor C _o- 1 such as R _o-1 and R _o is used. ₁ , 1 product storage section in C _o
There are various types of refrigeration cycles, such as those with refrigeration cycles configured to cool L _{n-1 and} L _n , and air conditioning refrigerators 3 and refrigerated warehouse refrigerators 4, which are not particularly shown, are available. Like the refrigerator, it is equipped with a compressor and a condenser to cool the load space related to each refrigerator, and these constitute the refrigeration and air conditioning equipment. Furthermore, V ₁ , S ₁ , V ₂ ,
S ₂ ……V _n , S _n ……S′, S″ are each product storage section L ₁ , L ₂
..., etc., corresponding to the load space related to the refrigerator,
A refrigerant liquid control solenoid valve (hereinafter referred to as liquid solenoid valve) and a temperature sensor for the product storage section are installed one by one, and each liquid solenoid valve detects when the temperature of the product storage section reaches the set temperature The load space is independent and separate from the associated refrigerator and other load spaces,
Operates to close the valve.

For example, when the temperature of product storage section L ₁ reaches the set temperature, only liquid solenoid valve V ₁ is closed, and liquid refrigerant is supplied to the cooling heat exchangers of product storage sections L ₂ and L ₃ that have not reached the set temperature. The supplied liquid solenoid valves V ₂ and V ₃ remain open, and the compressor C ₁ to which this product storage section L ₁ is associated continues to operate without any direct relationship with the closing of the liquid solenoid valve V ₁ . do.

Therefore, the power required to operate such refrigeration and air conditioning equipment depends on the load conditions of each refrigerator, for example,
This varies widely depending on the amount of product stored, the rotation rate, the number of customers, outside air conditions, and frost formation.If each refrigerator is left to operate freely, the expected capacity of the power receiving equipment cannot be predicted. It is necessary to set it according to the instantaneous maximum power usage. Furthermore, if a control device that can rationally reduce the power consumption of electrical equipment that is operated simultaneously can be obtained, the running costs of power receiving equipment and the electrical energy consumption can be greatly reduced.

The present invention is a power supply control device that performs centralized management of power receiving equipment, and has been designed in view of the above points. The purpose of this system is to forcibly stop the refrigerator for a set period of time every time in order to reduce the power consumption of the refrigerator. Explain the invention.

FIG. 2 is a block configuration diagram showing an embodiment in which the control device of the present invention is applied to the large-scale store equipment shown in FIG. It is represented by the number.

_{X 1 , X 2 .... _ _ _} , P ₂ ′...P _o is a central controller 8 and a relay X ₁ by a microcomputer system configured by a large-scale integrated circuit,
X ₂ . _{. .} Connector 9 connects the temperature detectors S ₁ , S _{2 .} . . a voltage-frequency converter 10, a multiplexer for sending via a counter 11 to an input/output interface 12;
3 is a timer load 1 such as a lighting equipment 5 or a boiler (not shown), which can start or stop power supply at a fixed time.
4 is a power supply relay, 15 is an alarm display device,
16 is an alarm notification device, Q is an input device for control setting values, 17 is a time display device, 18 is a power consumption recording device, 19 is a storage device for storing control settings values and programs (hereinafter referred to as RO), and 20 is a program A storage device for control execution (hereinafter referred to as RAM), 22 a converter for detecting power usage of the power receiving equipment, and 23 a power usage indicator.

The large-scale integrated circuit 24 constituting the central controller 8 includes a load management logic 25, a temperature management logic 26, a time management logic 27 that divides the frequency of the commercial frequency power supply and manages time, and a system controller (not shown). (omitted), and is connected to the ROM 19, RAM 20, and input/output interface 12 via an address bus 28, data buses 29, 29, and input/output ports 30.

The control setting value input device Q includes, for example, a control temperature setting Q ₂ for each freezing and refrigeration equipment, a power consumption control switching time setting Q ₃ (to be described later), a stop time setting Q ₄ , and a maximum allowable power setting Q _{5 .} , power differential setting Q ₆ , night setback setting Q ₇ , timer load management time setting Q ₈ , etc. Setting values and refrigerator or product compartment numbers can be determined using the numeric keypad or rotary switch. The value is converted into a digital quantity and sent to the input/output interface. The alarm display device 15 is a light emitting diode, etc.
Appropriate light-emitting elements F ₁ , F ₂ ...represented by Fl,
The display contents may include, for example, an excessive power usage warning.
F ₁ , Load display during additional time control F ₂ ... Temperature abnormality alarm in load space such as product storage section Fl _-2 ... Power outage alarm
Fl _-1 , failure alarm Fl with self-check function, etc., including temperature abnormality alarm F _-2 , power outage alarm Fl _-1 ,
The output signal of the failure alarm Fl of the self-check function is
It is connected via an OR logic element 31 to an alarm notification device for a security company, security station, etc.

Control of the power receiving equipment having such a configuration will be explained below.

In order to simplify the explanation of the present invention, the refrigerator in FIG. 1 and FIG. 2 related to the explanation thereof has compressors C ₁ , C ₂ . . . C _o-1 , _Co as relays X ₁ , X ₂ ……
When powered through X _o-1 , X _o , each compressor is connected to the load space
L ₁ , L ₂ ... L', L'' ... L _n-1 , L _n The operation is controlled individually according to the cooling state of L n, and when frost forms on the heat exchanger that cools each load space, The refrigerator is shown as having a controller (not shown) that can perform defrosting operation independently, regardless of other refrigerators.Therefore, the central controller 8 and refrigerators R ₁ and R in the figure ₂ ...The relationship with R _o , 3, 4 is that the presence or absence of defrosting operation is detected via the defrost detectors D ₁ , D ₂ ... and the connectors P ₁ , P ₂ ..., and the load space L ₁ , _L2 ...
…L _n , L′, L″ temperature is detected by temperature detectors S ₁ , S ₂ …S _n ,
S', S'', multiplexer 9, etc., and sends the signal to the central controller 8 while taking into account these detection inputs, various setting values written in the storage device 19 in advance, and the total power consumption of the power receiving equipment. Therefore, the relays for supplying power to _the compressor X ₁ , X _{2 . . .} It is designed to control V _n-1 and V _n .

Therefore, in order to control the power receiving equipment by the central controller 8, in advance, so that one or more of the electrical devices constituting the power receiving equipment is always in a stopped state,
According to the program written in ROM19,
Relay X ₁ , X ₂ ...X _o-1 , X _o , any one of 13
The total power consumption (hereinafter referred to as "total power amount") is achieved by sequentially opening three or more electrical devices and forcibly stopping all electrical devices for a set time at regular intervals.
When the total power consumption in the power receiving equipment (hereinafter referred to as power consumption) exceeds a set value, the electric equipment is stopped in accordance with the predetermined order written in the ROM 19, and the consumption is reduced. It is combined with a power consumption control mechanism that suppresses power consumption below a set value.

However, if the electrical equipment whose operation is stopped by the output signal from the power consumption control mechanism or the total power consumption control mechanism is a refrigerator, the room or product that is maintained at a low temperature by the refrigerator The chiller is stopped after confirming that the temperature conditions in the load space such as the storage room are unique to that space.The operating relationship is as shown in Figure 3, and when the chiller is stopped, Off-cycle defrost is performed.

That is, the power consumption setting value of the power receiving equipment is input from the control setting value input device Q to the ROM 19 of the central controller.
W _S Power differential W _D to be described later, cooling temperature T ₁ , T ₂ ...T _n-1 , T _n of each load space, switching time τ ₁ , τ ₂ of total power amount control, similarly, stop time τ′ ₁ ,
In the state in which τ′ ₂ is written, when the load of the refrigerator that constitutes the power receiving equipment is in a normal state and the power consumption is less than the set value W _S , the output signal from the total power consumption control mechanism is constant. For example, the first group of electrical devices C _K , C _K-1 ... and the second group of electrical devices C _o , C _o-1 ... are set one by one at intervals of time τ ₁ , τ ₂ . An output signal is output to open the corresponding relays X _K , X _{K-1 .} . . X _o , X _{o-1 .}

As shown above, relays X _K , X _K-1 ... X _o , X _o-1 ...
... are sequentially opened, and the electric equipment, which is the compressor of the first group and the second group, stops operating one after another.
When the ambient temperature is higher than 0° C., off-cycle defrosting is sequentially performed using the atmosphere of each compressor and the corresponding cooler during the operation stop time.

In this case, at point G, where the power consumption exceeds the allowable value W _S due to an increase in the refrigeration load, etc.
The power consumption control mechanism outputs an output signal every fixed time τ (this time width is preferably shorter than the time width τ ₀ of the total power consumption control mechanism), and the second group of electrical devices C _o , C _{o - 1} ..., the corresponding relays X _o , X _{o-1 .} . . are opened so as to stop them in a predetermined order.

The classification of electrical equipment into Group 1 and Group 2 is for convenience only, and when grouping is not necessary,
Treated as C _K = C _o .

Through such power consumption control, the power consumption is reduced by an amount equal to or greater than the power differential W _D to the set value W _S
When the power consumption has decreased further, the output of the increased number of operating units is increased so that the electrical equipment subject to power consumption control, _Co , Co _-1 , _Co-2 ..., returns to operation in the reverse order from when they stopped. A signal is given.

When going through this process of power consumption control,
If the load condition returns to light load _H1 or normal load _H2 , power consumption control is no longer necessary and only total power amount control continues.

As described above, in the power supply control device of the present invention, the power consumption of the power receiving equipment is kept below the rated power of the power receiving equipment by controlling the total power amount, and it is not possible to keep the power consumption below the setting by controlling the total power amount alone. Under conditions where this cannot be maintained, power consumption control may be used to forcibly switch off electrical equipment with warm temperature control or lighting conditions.
Operation is stopped and power consumption is managed to never exceed the rated power of the power receiving equipment.

Therefore, such power consumption control and total power consumption control are performed on the refrigerator included in the electrical equipment, and more specifically, on the refrigerator included in the electrical equipment.
This is done on the premise that the products in the load space, which are maintained at low temperatures by each refrigerator, will not be damaged, and inside the large-scale integrated circuit 24, the total power amount control and power consumption control are An output signal is output through a sequence as shown in FIG. 4, which takes into consideration the temperature conditions of the load space to which the refrigerator relates and the defrosting conditions. In this case, the parts K ₁ , K ₂ ,
As seen in K ₃ , there are cases where no output signal is actually output.

That is, in FIG. 4, 15
is a display light emitting diode, 16 is a power alarm, 18
19′ is a power system storage unit of ROM, 19″ is a storage unit for total power consumption control,
22 is a detection converter for input from the power sensor 22';
23 is a power usage display section, 26 is a temperature control logic, 32 is an AND logic, 33 is an OR logic,
Q ₄ is the stop time, Q ₅ is the maximum allowable power setting, Q ₆
is an input device for power differential setting,
X' indicates a drive unit for relay
E ₁ is the total power consumption control mechanism, E ₂ is the power consumption control mechanism,
E ₃ indicates a defrost signal, E ₄ indicates a temperature signal, and under such a sequence, if an output signal is now output from the total power consumption control mechanism E ₁ to a certain electrical device at fixed time intervals. , when the temperature output signal _E4 is not output after a certain period of time has elapsed after the temperature of the load space related to this electrical equipment has fallen below the set temperature previously written in the ROM 19, and
If this electrical equipment is not related to defrosting, or if it is related but not defrosting, the output signal from the temperature control logic 26 is output, so the AND of the output signal from the OR logic 33 is output. The logic 32 outputs an output signal to operate the drive unit X' to indicate the stoppage of the electrical equipment by controlling the total amount of electric power using the display light emitting diode 15, and also turns off the relay X and writes the electrical equipment to the ROM 19. This stops the operation for a set period of time. Further, this operation is exactly the same for the output signal from the power consumption control mechanism _E2 .

In other words, according to this sequence, if the electrical equipment to be controlled by the control mechanism is a refrigerator,
Defrost signal E ₃ and temperature signal E ₄ are not output,
When an output signal is output from the temperature management logic 26, and when an output signal is output from the total power consumption control mechanism _E1 at fixed time intervals, the AND logic 32 inputs the signal from the set time OR logic 33, Operation of the refrigerator is stopped for the set time. or,
When the refrigerator is defrosting or has just been defrosted and the temperature of the product storage area, which is the load space, has just reached the set temperature, the defrost signal E ₃ and temperature signal E _{4 are} activated. Since the signals from the control mechanisms E 1 and E 2 do not enter the AND logic 32, the signals from the control mechanisms E ₁ and E ₂ enter the OR logic 33.
Even if the output goes through the above, the AND logic 32 will not operate, and the compressor of the refrigerator will not enter the total power consumption control until the next cycle of total power consumption control. Unless the logic 26 outputs an output signal, the compressor will not be stopped by power consumption control.

As described above, the power supply control device according to the present invention can be used to control a plurality of electrical devices that are operated simultaneously, such as a product storage section of a refrigerator included in the electrical devices, or an air-conditioned room, etc. This system controls power consumption by taking into account the temperature conditions of the load space, and keeps the power consumption of the power receiving equipment below the maximum allowable power at all times, without adversely affecting the quality of the product. This is particularly effective in power supply control for large-scale stores such as supermarkets and department stores.

[Brief explanation of drawings]

Fig. 1 is a block diagram of electrical equipment showing an example of power receiving equipment in a large-scale store, Fig. 2 is a block diagram showing the electrical connections of the power supply control device according to the present invention, and Fig. 3 is a time chart showing an overview of the control. 4 are block diagrams showing an example of the load management logic of the block diagram shown in FIG. 2. R ₁ , R ₂ ... R _K , R _K+1 ... R _o-1 , R _o ... Refrigerator for storage case, 3 ... Refrigerator for air conditioning, 4 ... Refrigerator for cold storage, 8 ... Centralized controller, L ₁ ...L _o ,
L', L''...Load space, _E1 ...Total power consumption control mechanism, 25...Load management logic.

Claims (1)

[Claims] 1. When the total power consumption of power receiving equipment that has multiple electrical devices operating simultaneously exceeds the upper limit setting, the operation of the electrical devices is forcibly stopped in a predetermined order, and the total power consumption is a power consumption control mechanism that outputs an output signal to start operating the electrical equipment in the reverse order when the power consumption falls below a lower limit set value;
The operation of the electrical equipment is stopped by the output signal of the control mechanism, and at least one refrigerator as an electrical equipment included in the power receiving equipment is maintained at a low temperature by the refrigerator. A power supply control device that is configured to shut down in response to an output signal from the control mechanism only when specific temperature control conditions of a load space in which the load space is being stored are satisfied.