CN106288598B - Freezer refrigerating automatic control system and method based on distributed photovoltaic power generation - Google Patents
Freezer refrigerating automatic control system and method based on distributed photovoltaic power generation Download PDFInfo
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- CN106288598B CN106288598B CN201610646698.3A CN201610646698A CN106288598B CN 106288598 B CN106288598 B CN 106288598B CN 201610646698 A CN201610646698 A CN 201610646698A CN 106288598 B CN106288598 B CN 106288598B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The present invention provides freezer refrigerating automatic control system and method based on distributed photovoltaic power generation, which includes photovoltaic generation unit, main control unit, switch unit, refrigeration unit, temperature detecting unit and display unit；Photovoltaic generation unit collects illumination and obtains electric energy and be sent to low-voltage power supply network；When user carries out automatically controlling refrigeration fan on-off, main control unit opens auto-controll operation by display unit touch screen control PLC；Acquire the temperature in freezer in real time by temperature detecting unit, the current temperature value in freezer is compared with the temperature upper limit threshold value of setting and lowest temperature threshold value by main control unit, by the on-off of control switch unit, the unlatching number of units of refrigeration unit refrigeration fan is controlled；The present invention realizes intelligent opening and closing to refrigeration fan in freezer, saves manpower and material resources, reduces electric cost, improves production efficiency, realizes unattended automation freezer.
Description
Technical field
The invention belongs to electricity needs field of terminal technology, and in particular to the freezer refrigerating based on distributed photovoltaic power generation is certainly
Autocontrol system and method.
Background technique
Currently, most domestic freezer be all by power grid power supply and the degree of automation it is generally relatively low, consume a large amount of
Therefore electric energy, freezer also become one of large electricity consumer.The energy conservation of freezer, which is conducive to freezer, reduces production cost, increases economic efficiency
And promote the long term growth of freezer.Show according to the statistics made by the departments concerned freezer realize automation control compared to manually controlling, it is cold
It library can energy conservation 10%~15% or so.Freezer is powered using photovoltaic power generation technology compared to power grid, and freezer can reduce centainly
The production cost of amount.
In the daily operation management of freezer, in order to keep temperature of ice house to change in a certain range, staff every
A period of time observes the situation of change of each cold storehouse temperature, when some temperature of ice house is higher than upper limit value, then starts corresponding freezer
Interior refrigeration unit；When some temperature of ice house be lower than lower limit value, then stop the refrigeration unit in corresponding freezer.Pass through manual control
The start and stop of refrigeration unit, although can satisfy the demand of cold storehouse temperature, the production cost of freezer is but remained high.Reason
Be refrigeration unit in freezer powered by power grid, refrigeration unit needs run for 24 hours, consume a large amount of electric energy and by
Refrigeration unit operation is manually controlled, regular hour delay can be inevitably generated, cause refrigerating efficiency relatively low.Current existing refrigeration
Control technology can effectively freeze under the premise of power grid power supply is normal and operator is without fault.But the electricity consumption of freezer at
This height, control efficiency are relatively low, are not carried out the target of economize on electricity consumption reduction, increase production cost on the contrary.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes that a kind of freezer refrigerating based on distributed photovoltaic power generation automatically controls
System and method.
The technical scheme is that
On the one hand, a kind of freezer refrigerating automatic control system based on distributed photovoltaic power generation, including photovoltaic generation unit,
Main control unit, switch unit, refrigeration unit, temperature detecting unit and display unit；
The photovoltaic generation unit, including photovoltaic cell component, photovoltaic controller, battery and inverter；
The main control unit, including PLC and temperature polling instrument；
The switch unit, including N number of relay, N number of A.C. contactor and N number of breaker；
The refrigeration unit, including compressor, evaporator, throttle valve, condenser and N number of refrigeration fan；
The temperature detecting unit, including K temperature sensor；
The display unit is touch display screen；
The anode of the photovoltaic cell component connects the positive port of the photovoltaic controller, the photovoltaic cell component
Cathode connects the cathode port of the photovoltaic controller, and the battery positive voltage port is being separately connected the photovoltaic controller just
The positive port of extreme mouth and the inverter, the battery terminal negative port is separately connected the negative pole end of the photovoltaic controller
The output end of the cathode port of mouth and the inverter, the inverter connects low-voltage power supply network, the power input of the PLC
220V low-voltage power supply network is connected, the temperature polling instrument connects the RS485 data port of the PLC by the port RS485, and n-th
The control terminal of a refrigeration fan connects one end of n-th of A.C. contactor, n-th A.C. contactor it is another
One end of n-th of breaker of end connection, the control terminal of each A.C. contactor connect the input terminal of the PLC, and n-th
The control terminal of a A.C. contactor is also connected with one end of n-th of relay, and the other end of each breaker connects
380V low-voltage power supply network is connect, the other end of each relay connects the output end of the PLC, and the output end of the PLC is also
The control terminal of the condenser and the control terminal of the compressor are connected, the feeder ear of the compressor connects 380V low-voltage power supply
Net, the output end of the compressor connect the input terminal of the condenser, and the output end of the condenser connects the throttle valve
Input terminal, the output end of the throttle valve connects the input terminal of the evaporator, described in the output end connection of the evaporator
The input terminal of compressor, N number of refrigeration fan are all set in the evaporator back end, the output of the K temperature sensor
End is all connected with the input terminal of temperature polling instrument, and the touch display screen connects the ethernet communication port of PLC by Ethernet,
In, n=1 ... N.
Optionally, the photovoltaic cell component converts light energy into electric energy for collecting illumination；
The photovoltaic controller, the voltage of the photovoltaic battery panel for controlling photovoltaic cell component, obtains stable output
Voltage is to charge the battery；
The battery, for storing the electric energy issued by photovoltaic cell component；
The inverter, for being and utility network by the DC inverter of the photovoltaic battery panel of photovoltaic cell component conversion
With the alternating current of frequency, same-phase, and it is sent to low-voltage power supply network；
The PLC, for current temperature value and setting in freezer temperature upper limit threshold value and lowest temperature threshold value into
Row compares, and by controlling the on-off of relay and corresponding A.C. contactor, controls the unlatching number of units of refrigeration fan in freezer；It is logical
It crosses and judges whether to have the control signal of A.C. contactor to obtain current control state；Control the on-off of condenser and compressor；
The temperature polling instrument, the temperature value in freezer for acquiring K temperature sensor are transmitted to PLC；
The relay, for controlling the on-off of corresponding A.C. contactor according to PLC；
The A.C. contactor, for controlling the start and stop of corresponding refrigeration fan, for being manually controlled in user
When refrigeration fan on-off, status signal is sent to PLC；
The breaker, for carrying out open circuit protection to refrigeration fan route；
The temperature sensor for acquiring temperature in freezer, and is transmitted to temperature polling instrument；
Temperature upper limit threshold value and lowest temperature threshold is arranged for showing the real-time temperature values of freezer in the touch display screen
Value, setting starting stop the auto-controll operation of PLC, show operating status.
Optionally, the main control unit further includes DI/DO expansion module, the extension of the DI/DO expansion module and PLC
Port connection, the DI/DO expansion module is for realizing the N number of relay and N number of ac contactor in PLC and the switch unit
Connection between device.
On the other hand, a kind of method that freezer refrigerating automatically controls uses the freezer refrigerating based on distributed photovoltaic power generation certainly
Autocontrol system, comprising the following steps:
Step 1: photovoltaic cell component collects illumination, converts light energy into electric energy, controls photovoltaic electric by photovoltaic controller
The voltage of the photovoltaic battery panel of pond component obtains stable output voltage to charge the battery；
Step 2: being and public power by the DC inverter that the photovoltaic battery panel of photovoltaic cell component is converted by inverter
The alternating current of the same frequency of net, same-phase, and it is sent to low-voltage power supply network；
Step 3: when user manually controls refrigeration fan on-off, A.C. contactor sends status signal to PLC, works as user
When carrying out automatically controlling refrigeration fan on-off, auto-controll operation is opened by touch screen control PLC；
Step 4: temperature upper limit threshold value and lowest temperature threshold value are arranged by touch display screen；
Step 5: acquiring the temperature in freezer in real time by K temperature sensor, and pass through temperature polling instrument for each temperature
Angle value is transmitted in PLC；
Step 6: by PLC to the temperature upper limit threshold value of current temperature value and setting in freezer and lowest temperature threshold value into
Row compares, and by controlling the on-off of relay and corresponding A.C. contactor, controls the unlatching number of units of refrigeration fan in freezer, leads to
It crosses PLC control compressor and condenser opens operation；
Step 7: in PLC control process, touch screen display shows the real-time temperature values of freezer and is currently at automatic
Or state is manually controlled, return step 1.
Optionally, the step 6 comprises the following steps:
Step 6.1: by PLC to the temperature upper limit threshold value and lowest temperature threshold value of current temperature value and setting in freezer
It is compared, if current temperature value is greater than the temperature upper limit of setting, thens follow the steps 6.2, if current temperature value is less than setting
Temperature upper limit value, then follow the steps 6.3, if current temperature value be greater than setting temperature upper limit value and be less than setting temperature on
Limit value thens follow the steps 6.4, and the current temperature value is the mean value of the temperature in the freezer of K temperature sensor acquisition；
Step 6.2: N number of relay being controlled by PLC and is connected to corresponding A.C. contactor, N number of refrigeration in freezer is opened
Blower freezes to freezer, controls compressor by PLC and condenser opens operation, return step 6.1；
Step 6.3: N number of relay being controlled by PLC and corresponding A.C. contactor turns off, closes N number of refrigeration in freezer
Blower controls compressor by PLC and condenser turns off, return step 6.1；
Step 6.4: the relationship at current time and peak valley period of powering is judged by PLC, if current time is power supply peak
The electric period, 6.3 are thened follow the steps, if current time is the power supply paddy electricity period, 6.5 is thened follow the steps, if current time is
It powers the ordinary telegram period, thens follow the steps 6.7；
Step 6.5: judging that current temperature of ice house change rate Δ T and rate of temperature change upper limit threshold and temperature become by PLC
The relationship of rate lower threshold thens follow the steps if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold
6.2, if current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold, 6.3 are thened follow the steps, if current freezer temperature
It spends change rate Δ T to be greater than rate of temperature change lower threshold and be less than rate of temperature change upper limit threshold, thens follow the steps 6.6；
Step 6.6: paddy electricity period freezer refrigerating unit unlatching rate A=1-100 Δ T being calculated by PLC, according to the paddy electricity period
Freezer refrigerating unit unlatching rate A controls the unlatching number of refrigeration unit in freezer, and controls compressor and condenser unlatching operation,
Return step 6.1；
Step 6.7: judging that current temperature of ice house change rate Δ T and rate of temperature change upper limit threshold and temperature become by PLC
The relationship of rate lower threshold thens follow the steps if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold
6.2, if current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold, 6.3 are thened follow the steps, if current freezer temperature
It spends change rate Δ T to be greater than rate of temperature change lower threshold and be less than rate of temperature change upper limit threshold, thens follow the steps 6.8；
Step 6.8: ordinary telegram period freezer refrigerating unit unlatching rate A '=0.6 (1-100 Δ T) being calculated by PLC, according to flat
The unlatching number of refrigeration unit in electric period freezer refrigerating unit unlatching rate A ' control freezer, and control compressor and condenser is opened
Start shipment row, return step 6.1.
Beneficial effects of the present invention:
The present invention proposes that a kind of freezer refrigerating automatic control system and method based on distributed photovoltaic power generation, the present invention are real
The intelligent opening to refrigeration fan in freezer and closing are showed, have saved manpower and material resources, has reduced electric cost, improves production effect
Rate realizes unattended automation freezer.
Detailed description of the invention
Fig. 1 is the knot of the freezer refrigerating automatic control system based on distributed photovoltaic power generation in the specific embodiment of the invention
Structure block diagram；
Fig. 2 is the stream of the freezer refrigerating autocontrol method based on distributed photovoltaic power generation in the specific embodiment of the invention
Cheng Tu；
Fig. 3 is the flow chart for controlling the unlatching number of units of refrigeration fan in freezer in the specific embodiment of the invention by PLC.
Specific embodiment
The specific embodiment of the invention is described in detail with reference to the accompanying drawing.
A kind of freezer refrigerating automatic control system based on distributed photovoltaic power generation, as shown in Figure 1, including photovoltaic power generation list
Member, main control unit, switch unit, refrigeration unit, temperature detecting unit and display unit.
Photovoltaic generation unit, including photovoltaic cell component, photovoltaic controller, battery and inverter.
Photovoltaic cell component converts light energy into electric energy for collecting illumination.
Photovoltaic controller, the voltage of the photovoltaic battery panel for controlling photovoltaic cell component, obtains stable output voltage
To charge the battery.
Battery, for storing the electric energy issued by photovoltaic cell component.
In present embodiment, inverter select and meanwhile export 380V and 220V voltage, frequency be 50Hz alternating current
Inverter, for being with utility network with frequency, same-phase by the DC inverter of the photovoltaic battery panel conversion of photovoltaic cell component
Alternating current, and be sent to low-voltage power supply network.
Main control unit, including PLC and temperature polling instrument further include DI/DO expansion module.
In present embodiment, it includes power module, model that PLC type number, which is siemens PLC SMART type PLC,
The CPU module of SR60.The power input of PLC connects 220V low-voltage power supply network.PLC be used for in freezer current temperature value with
The temperature upper limit threshold value and lowest temperature threshold value of setting are compared, and pass through the logical of control relay and corresponding A.C. contactor
It is disconnected, control the unlatching number of units of refrigeration fan in freezer；By judging whether to have the control signal of A.C. contactor to obtain currently
State of a control；Control the on-off of condenser and compressor.
In present embodiment, as long as when refrigeration unit has a refrigeration fan starting, condenser, compressor, evaporator
It is opened with throttle valve.
The ECP Extended Capabilities Port and DI/DO expansion module EMDR32 of the CPU module of DI/DO expansion module model EMDR32, PLC
ECP Extended Capabilities Port connection.DI/DO expansion module, for realizing the N number of relay and N number of ac contactor in PLC and switch unit
Connection between device.
In present embodiment, temperature polling instrument, model DCW-8C type.It is cold for acquiring K=4 temperature sensor
Temperature value in library is transmitted to PLC.
Switch unit, including N=5 relay, N=5 A.C. contactor and N=5 breaker.
In present embodiment, relay model MY4N-J, for controlling the logical of corresponding A.C. contactor according to PLC
It is disconnected.
A.C. contactor model CJX20910, for controlling the start and stop of corresponding refrigeration fan, for
When family manually controls refrigeration fan on-off, status signal is sent to PLC.
Breaker model DZ47-60C20A, for carrying out open circuit protection to refrigeration fan route.
Refrigeration unit, including compressor, evaporator, throttle valve, condenser and N number of refrigeration fan.
In present embodiment, temperature detecting unit, including K=4 temperature sensor, it is all set in the ceiling of freezer
Between position.Equal selected range is 0~400 DEG C, precision 0.2%, input direct-current voltage 24V, output are 4~20mA DC current
Platinum thermal resistance sensor PT100.For acquiring temperature in freezer, and it is transmitted to temperature polling instrument.
In present embodiment, display unit is 7 cun of touch display screens, for showing the real-time temperature values of freezer, setting temperature
Upper limit threshold and lowest temperature threshold value are spent, setting starting stops the auto-controll operation of PLC, shows operating status.
The positive port of the anode connection photovoltaic controller of photovoltaic cell component, the cathode of photovoltaic cell component connect photovoltaic
The cathode port of controller, battery positive voltage port are separately connected positive port and the positive terminal of inverter of photovoltaic controller
Mouthful, battery terminal negative port is separately connected the cathode port of photovoltaic controller and the cathode port of inverter, the output of inverter
End connection low-voltage power supply network, the power input of PLC connect 220V low-voltage power supply network, and temperature polling instrument is connected by the port RS485
The RS485 data port of PLC is connect, the control terminal of n-th of refrigeration fan connects one end of n-th of A.C. contactor, n-th of exchange
One end of the other end n-th of breaker of connection of contactor, the input terminal of the control terminal connection PLC of each A.C. contactor, n-th
The control terminal of a A.C. contactor is also connected with one end of n-th of relay, and the other end connection 380V low pressure of each breaker supplies
Power grid, the output end of the other end connection PLC of each relay, the output end of PLC are also connected with the control terminal and compression of condenser
The control terminal of machine, the feeder ear of compressor connect 380V low-voltage power supply network, and the output end of compressor connects the input terminal of condenser,
Condenser output end connection throttle valve input terminal, throttle valve output end connection evaporator input terminal, evaporator it is defeated
The input terminal of outlet connect compressor, 5 refrigeration fans are all set in evaporator back end, and the output end of 4 temperature sensors is equal
The input terminal of temperature polling instrument is connected, touch display screen connects the ethernet communication port of PLC by Ethernet, wherein n=
1…5。
A kind of method that freezer refrigerating automatically controls automatically controls system using the freezer refrigerating based on distributed photovoltaic power generation
System, as shown in Figure 2, comprising the following steps:
Step 1: photovoltaic cell component collects illumination, converts light energy into electric energy, controls photovoltaic electric by photovoltaic controller
The voltage of the photovoltaic battery panel of pond component obtains stable output voltage to charge the battery.
Step 2: being and public power by the DC inverter that the photovoltaic battery panel of photovoltaic cell component is converted by inverter
The alternating current of the same frequency of net, same-phase, and it is sent to low-voltage power supply network.
Step 3: when user manually controls refrigeration fan on-off, A.C. contactor sends status signal to PLC, works as user
When carrying out automatically controlling refrigeration fan on-off, auto-controll operation is opened by touch screen control PLC.
Step 4: temperature upper limit threshold value and lowest temperature threshold value are arranged by touch display screen.
In present embodiment, lowest temperature threshold value is set as -3 DEG C.Temperature upper limit threshold value is set as 0 DEG C.
Step 5: acquiring the temperature in freezer in real time by 4 temperature sensors, and pass through temperature polling instrument for each temperature
Angle value is transmitted in PLC.
Step 6: by PLC to the temperature upper limit threshold value of current temperature value and setting in freezer and lowest temperature threshold value into
Row compares, and by controlling the on-off of relay and corresponding A.C. contactor, controls the unlatching number of units of refrigeration fan in freezer, leads to
It crosses PLC control compressor and condenser opens operation, as shown in Figure 3.
Step 6.1: by PLC to the temperature upper limit threshold value and lowest temperature threshold value of current temperature value and setting in freezer
It is compared, if current temperature value is greater than the temperature upper limit of setting, thens follow the steps 6.2, if current temperature value is less than setting
Temperature upper limit value, then follow the steps 6.3, if current temperature value be greater than setting temperature upper limit value and be less than setting temperature on
Limit value thens follow the steps 6.4, and current temperature value is the mean value of the temperature in the freezer of 4 temperature sensors acquisition.
In present embodiment, if current temperature value is greater than 0 DEG C of temperature upper limit of setting, PLC output valve freezer refrigerating
Unit unlatching rate A=1 executes step 6.2.
If current temperature value is less than -3 DEG C of temperature upper limit value of setting, PLC output valve freezer refrigerating unit unlatching rate A=
0, then follow the steps 6.3.
If current temperature value is greater than -3 DEG C of the temperature upper limit value of setting and is less than 0 DEG C of temperature upper limit set, execute
Step 6.4.
Step 6.2: 5 relays being controlled by PLC and are connected to corresponding A.C. contactor, 5 refrigeration in freezer are opened
Blower freezes to freezer, controls compressor by PLC and condenser opens operation, return step 6.1.
Step 6.3: 5 relays being controlled by PLC and corresponding A.C. contactor turns off, close 5 refrigeration in freezer
Blower controls compressor by PLC and condenser turns off, return step 6.1.
Step 6.4: the relationship at current time and peak valley period of powering is judged by PLC, if current time is power supply peak
The electric period, 6.3 are thened follow the steps, if current time is the power supply paddy electricity period, 6.5 is thened follow the steps, if current time is
It powers the ordinary telegram period, thens follow the steps 6.7.
Step 6.5: judging that current temperature of ice house change rate Δ T and rate of temperature change upper limit threshold and temperature become by PLC
The relationship of rate lower threshold thens follow the steps if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold
6.2, if current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold, 6.3 are thened follow the steps, if current freezer temperature
It spends change rate Δ T to be greater than rate of temperature change lower threshold and be less than rate of temperature change upper limit threshold, thens follow the steps 6.6.
In present embodiment, if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold 0.01,
PLC output valve freezer refrigerating unit unlatching rate A=1 executes step 6.2.
If current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold 0, PLC output valve freezer refrigerating
Unit unlatching rate A=0, thens follow the steps 6.3.
If current temperature of ice house change rate Δ T is greater than rate of temperature change lower threshold 0 and is less than the rate of temperature change upper limit
Threshold value 0.01, thens follow the steps 6.6.
Step 6.6: paddy electricity period freezer refrigerating unit unlatching rate A=1-100 Δ T being calculated by PLC, according to the paddy electricity period
Freezer refrigerating unit unlatching rate A controls the unlatching number of refrigeration unit in freezer, and controls compressor and condenser unlatching operation,
Return step 6.1.
In present embodiment, as 0≤A < 0.1, the port DO of the DI/DO expansion module of PLC is controlled without output by PLC
5 relays and the shutdown of corresponding A.C. contactor are made, 5 refrigeration fans in freezer are closed.
As 0.1≤A < 0.3, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 1 refrigeration fan.
As 0.3≤A < 0.5, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 2 refrigeration fans.
As 0.5≤A < 0.7, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 3 refrigeration fans.
As 0.7≤A < 0.9, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 4 refrigeration fans.
As 0.9≤A < 1, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control 5 relays and
Corresponding A.C. contactor connection, opens 5 refrigeration fans in freezer.
Step 6.7: judging that current temperature of ice house change rate Δ T and rate of temperature change upper limit threshold and temperature become by PLC
The relationship of rate lower threshold thens follow the steps if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold
6.2, if current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold, 6.3 are thened follow the steps, if current freezer temperature
It spends change rate Δ T to be greater than rate of temperature change lower threshold and be less than rate of temperature change upper limit threshold, thens follow the steps 6.8.
In present embodiment, if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold 0.01,
PLC output valve freezer refrigerating unit unlatching rate A=1 executes step 6.2.
If current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold 0, PLC output valve freezer refrigerating
Unit unlatching rate A=0, thens follow the steps 6.3.
If current temperature of ice house change rate Δ T is greater than rate of temperature change lower threshold 0 and is less than the rate of temperature change upper limit
Threshold value 0.01, thens follow the steps 6.8.
Step 6.8: ordinary telegram period freezer refrigerating unit unlatching rate A '=0.6 (1-100 Δ T) being calculated by PLC, according to flat
The unlatching number of refrigeration unit in electric period freezer refrigerating unit unlatching rate A ' control freezer, and control compressor and condenser is opened
Start shipment row, return step 6.1.
In present embodiment, as 0≤A ' < 0.1, the port DO of the DI/DO expansion module of PLC passes through PLC without output
5 relays and the shutdown of corresponding A.C. contactor are controlled, 5 refrigeration fans in freezer are closed.
As 0.1≤A ' < 0.3, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 1 refrigeration fan.
As 0.3≤A ' < 0.5, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 2 refrigeration fans.
As 0.5≤A ' < 0.7, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 3 refrigeration fans.
As 0.7≤A ' < 0.9, there is output in the port DO of the DI/DO expansion module of PLC, by PLC control relay and
Corresponding A.C. contactor starts 4 refrigeration fans.
As 0.9≤A ' < 1, there is output in the port DO of the DI/DO expansion module of PLC, controls 5 relays by PLC
It is connected to corresponding A.C. contactor, opens 5 refrigeration fans in freezer.
Step 7: in PLC control process, touch screen display shows the real-time temperature values of freezer and is currently at automatic
Or state is manually controlled, return step 1.
Claims (5)
1. a kind of freezer refrigerating automatic control system based on distributed photovoltaic power generation, including photovoltaic generation unit, main control list
Member, switch unit, refrigeration unit, temperature detecting unit and display unit；
The photovoltaic generation unit, including photovoltaic cell component, photovoltaic controller, battery and inverter；
The main control unit, including PLC and temperature polling instrument；
The switch unit, including N number of relay, N number of A.C. contactor and N number of breaker；
The refrigeration unit, including compressor, evaporator, throttle valve, condenser and N number of refrigeration fan；
The temperature detecting unit, including K temperature sensor；
The display unit is touch display screen；
The anode of the photovoltaic cell component connects the positive port of the photovoltaic controller, the cathode of the photovoltaic cell component
The cathode port of the photovoltaic controller is connected, the battery positive voltage port is separately connected the positive terminal of the photovoltaic controller
Mouthful and the inverter positive port, the battery terminal negative port be separately connected the photovoltaic controller cathode port and
The cathode port of the inverter, the output end of the inverter connect low-voltage power supply network, the power input connection of the PLC
220V low-voltage power supply network, the temperature polling instrument connect the RS485 data port of the PLC, n-th of institute by the port RS485
The control terminal for stating refrigeration fan connects one end of n-th of A.C. contactor, and the other end of n-th of A.C. contactor connects
One end of n-th of breaker is connect, the control terminal of each A.C. contactor connects the input terminal of the PLC, n-th of institute
The control terminal for stating A.C. contactor is also connected with one end of n-th of relay, the other end connection of each breaker
The other end of 380V low-voltage power supply network, each relay connects the output end of the PLC, and the output end of the PLC also connects
The control terminal of the condenser and the control terminal of the compressor are connect, the feeder ear of the compressor connects 380V low-voltage power supply
Net, the output end of the compressor connect the input terminal of the condenser, and the output end of the condenser connects the throttle valve
Input terminal, the output end of the throttle valve connects the input terminal of the evaporator, described in the output end connection of the evaporator
The input terminal of compressor, N number of refrigeration fan are all set in the evaporator back end, the output of the K temperature sensor
End is all connected with the input terminal of temperature polling instrument, and the touch display screen connects the ethernet communication port of PLC by Ethernet,
In, n=1 ... N.
2. the freezer refrigerating automatic control system according to claim 1 based on distributed photovoltaic power generation, which is characterized in that
The photovoltaic cell component converts light energy into electric energy for collecting illumination；
The photovoltaic controller, the voltage of the photovoltaic battery panel for controlling photovoltaic cell component, obtains stable output voltage
To charge the battery；
The battery, for storing the electric energy issued by photovoltaic cell component；
The inverter, for being same with utility network by the DC inverter of the photovoltaic battery panel conversion of photovoltaic cell component
Frequently, the alternating current of same-phase, and it is sent to low-voltage power supply network；
The PLC, for current temperature value and setting in freezer temperature upper limit threshold value and lowest temperature threshold value compare
Compared with, by controlling the on-off of relay and corresponding A.C. contactor, the unlatching number of units of refrigeration fan in control freezer；By sentencing
It is disconnected that whether the control signal with A.C. contactor obtains current control state；Control the on-off of condenser and compressor；
The temperature polling instrument, the temperature value in freezer for acquiring K temperature sensor are transmitted to PLC；
The relay, for controlling the on-off of corresponding A.C. contactor according to PLC；
The A.C. contactor, for controlling the start and stop of corresponding refrigeration fan, for manually controlling refrigeration in user
When blower on-off, status signal is sent to PLC；
The breaker, for carrying out open circuit protection to refrigeration fan route；
The temperature sensor for acquiring temperature in freezer, and is transmitted to temperature polling instrument；
The touch display screen, for showing the real-time temperature values of freezer, setting temperature upper limit threshold value and lowest temperature threshold value, if
The auto-controll operation that starting stops PLC being set, shows operating status.
3. the freezer refrigerating automatic control system according to claim 1 based on distributed photovoltaic power generation, which is characterized in that
The main control unit further includes DI/DO expansion module, the ECP Extended Capabilities Port connection of the DI/DO expansion module and PLC, described
DI/DO expansion module is for realizing the connection between the N number of relay and N number of A.C. contactor in PLC and the switch unit.
4. a kind of method that freezer refrigerating automatically controls uses the freezer system described in claim 1 based on distributed photovoltaic power generation
Cold automatic control system, which comprises the following steps:
Step 1: photovoltaic cell component collects illumination, converts light energy into electric energy, controls photovoltaic cell group by photovoltaic controller
The voltage of the photovoltaic battery panel of part obtains stable output voltage to charge the battery；
Step 2: the DC inverter for being converted the photovoltaic battery panel of photovoltaic cell component by inverter is same with utility network
Frequently, the alternating current of same-phase, and it is sent to low-voltage power supply network；
Step 3: when user manually controls refrigeration fan on-off, A.C. contactor sends status signal to PLC, when user carries out
When automatically controlling refrigeration fan on-off, auto-controll operation is opened by touch screen control PLC；
Step 4: temperature upper limit threshold value and lowest temperature threshold value are arranged by touch display screen；
Step 5: acquiring the temperature in freezer in real time by K temperature sensor, and pass through temperature polling instrument for each temperature value
It is transmitted in PLC；
Step 6: being compared by temperature upper limit threshold value and lowest temperature threshold value of the PLC to current temperature value and setting in freezer
Compared with by controlling the on-off of relay and corresponding A.C. contactor, the unlatching number of units of refrigeration fan, passes through in control freezer
PLC controls compressor and condenser opens operation；
Step 7: in PLC control process, touch screen display shows the real-time temperature values of freezer and is currently at automatic or hand
Dynamic state of a control, return step 1.
5. the freezer refrigerating autocontrol method according to claim 4 based on distributed photovoltaic power generation, which is characterized in that
The step 6 comprises the following steps:
Step 6.1: being carried out by temperature upper limit threshold value and lowest temperature threshold value of the PLC to current temperature value and setting in freezer
Compare, if current temperature value is greater than the temperature upper limit of setting, then follow the steps 6.2, if current temperature value is less than the temperature of setting
Lower limit value is spent, thens follow the steps 6.3, if current temperature value is greater than the temperature upper limit value of setting and is less than the temperature upper limit of setting
Value thens follow the steps 6.4, and the current temperature value is the mean value of the temperature in the freezer of K temperature sensor acquisition；
Step 6.2: N number of relay being controlled by PLC and is connected to corresponding A.C. contactor, N number of refrigeration fan in freezer is opened
Freeze to freezer, compressor is controlled by PLC and condenser opens operation, return step 6.1；
Step 6.3: N number of relay is controlled by PLC and corresponding A.C. contactor turns off, closes N number of refrigeration fan in freezer,
Compressor and condenser shutdown, return step 6.1 are controlled by PLC；
Step 6.4: the relationship at current time and peak valley period of powering is judged by PLC, if current time is power supply peak electricity
Between section, then follow the steps 6.3, if current time be power supply the paddy electricity period, then follow the steps 6.5, if current time be power supply
The ordinary telegram period, then follow the steps 6.7；
Step 6.5: current temperature of ice house change rate Δ T and rate of temperature change upper limit threshold and rate of temperature change are judged by PLC
The relationship of lower threshold thens follow the steps 6.2 if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold, if
Current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold, thens follow the steps 6.3, if current temperature of ice house variation
Rate Δ T is greater than rate of temperature change lower threshold and is less than rate of temperature change upper limit threshold, thens follow the steps 6.6；
Step 6.6: paddy electricity period freezer refrigerating unit unlatching rate A=1-100 Δ T being calculated by PLC, according to paddy electricity period freezer
Refrigeration unit unlatching rate A controls the unlatching number of refrigeration unit in freezer, and controls compressor and condenser unlatching operation, returns
Step 6.1；
Step 6.7: current temperature of ice house change rate Δ T and rate of temperature change upper limit threshold and rate of temperature change are judged by PLC
The relationship of lower threshold thens follow the steps 6.2 if current temperature of ice house change rate Δ T is greater than rate of temperature change upper limit threshold, if
Current temperature of ice house change rate Δ T is less than rate of temperature change lower threshold, thens follow the steps 6.3, if current temperature of ice house variation
Rate Δ T is greater than rate of temperature change lower threshold and is less than rate of temperature change upper limit threshold, thens follow the steps 6.8；
Step 6.8: ordinary telegram period freezer refrigerating unit unlatching rate A '=0.6 (1-100 Δ T) being calculated by PLC, when according to ordinary telegram
The unlatching number of refrigeration unit in section freezer refrigerating unit unlatching rate A ' control freezer, and control compressor and condenser unlatching fortune
Row, return step 6.1.
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| CN109750774A (en) * | 2019-02-28 | 2019-05-14 | 北京汉能光伏技术有限公司 | A kind of photovoltaic curtain wall system and its heat dissipating method |
| CN110311371A (en) * | 2019-06-28 | 2019-10-08 | 天津大学 | A kind of photovoltaic refrigeration storage system and its load active control method based on virtual energy storage |
| CN113741663B (en) * | 2021-07-29 | 2023-08-11 | 苏州浪潮智能科技有限公司 | Server structure, method and storage medium for starting throttle mechanism |
| CN113758110A (en) * | 2021-09-10 | 2021-12-07 | 徐州五行冷暖设备有限公司 | Multi-refrigeration-house centralized intelligent temperature control management system |
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