CN114243700A - Photovoltaic and wind power generation direct current micro-grid refrigerating system - Google Patents

Photovoltaic and wind power generation direct current micro-grid refrigerating system Download PDF

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CN114243700A
CN114243700A CN202210038729.2A CN202210038729A CN114243700A CN 114243700 A CN114243700 A CN 114243700A CN 202210038729 A CN202210038729 A CN 202210038729A CN 114243700 A CN114243700 A CN 114243700A
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power generation
lmin
lmax
cold
cold water
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王丞相
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Shanghai Carbon Soot Energy Service Co ltd
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Shanghai Carbon Soot Energy Service Co ltd
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    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention relates to a photovoltaic and wind power generation direct current microgrid refrigerating system which comprises a luminosity sensor, a photovoltaic power generation device, a wind speed sensor, a wind power generation device, an electric power storage device, an isolating switch, a direct current bus, a variable frequency cooler, a cold storage device and a controller, wherein the luminosity sensor is connected with the photovoltaic power generation device; the photovoltaic power generation device, the wind power generation device and the electric power storage device are respectively connected with the isolating switch in series and then are interconnected and communicated through the direct-current bus bars to form a power supply loop which supplies power to the plurality of frequency conversion coolers connected in parallel; the variable-frequency coolers are connected in parallel through a cold water main pipe, and the cold water main pipe is communicated with the cold storage device through a first cold water branch pipe and is communicated with a cold water client through a second cold water branch pipe; the controller is electrically connected with the luminosity sensor, the photovoltaic power generation device, the wind speed sensor, the wind power generation device, the power storage device, the isolating switch, the variable-frequency cooler and the cold storage device; the controller implements a predictive control method. The method has the advantages of accurately predicting the state of the renewable energy source and reasonably distributing the flow direction of cold water.

Description

Photovoltaic and wind power generation direct current micro-grid refrigerating system
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of power supply systems, in particular to a photovoltaic and wind power generation direct-current microgrid refrigeration system.
[ background of the invention ]
The micro-grid is a power generation and distribution system integrating a distributed power supply, a load, an energy storage device, a current transformer and a monitoring protection device, is used as an organization form for effectively integrating and efficiently utilizing new energy to generate power, and realizes grid-connected or isolated island operation through technologies such as operation control, energy management and the like. The direct current links of the frequency converters are interconnected through a common direct current bus (direct current bus), so that the regenerative energy generated by one or more motors can be consumed and absorbed by other motors in an electric mode. A chiller is a machine that achieves a refrigeration effect through a vapor compression or absorption cycle. The ice maker is a device for refrigerating by utilizing the property that gaseous ammonia is easily compressed and liquefied.
In recent years, under the trend of continuous development of distributed power supply access technology, the demand that multiple distributed power supplies are combined to access a power distribution network in the form of a microgrid is continuously increased, and the problem that multiple microgrids run in parallel is urgently needed to be solved. At present, a common control mode only shows that redundant electric energy is directly discharged when a power grid is switched (switching, switching and cutting are equivalent to the meaning of switching), or the power supply of a micro-grid is insufficient, so that the system cannot normally operate, and energy waste is caused to a certain degree.
The invention improves the technology of the renewable energy direct current micro-grid refrigeration.
[ summary of the invention ]
The invention aims to provide a refrigerating system which can accurately predict the state of renewable energy and reasonably distribute the flow direction of cold water.
In order to achieve the purpose, the technical scheme adopted by the invention is that the photovoltaic and wind power generation direct-current microgrid refrigerating system comprises a luminosity sensor, a photovoltaic power generation device, a wind speed sensor, a wind power generation device, a power storage device, an isolating switch, a direct-current bus, a variable-frequency cooler, a cold storage device and a controller; the photovoltaic power generation device, the wind power generation device and the electric power storage device are respectively connected with the isolating switch in series and then are interconnected and communicated through the direct-current bus bars to form a power supply loop which supplies power to the plurality of frequency conversion coolers connected in parallel; the variable-frequency coolers are connected in parallel through a cold water main pipe, and the cold water main pipe is communicated with the cold storage device through a first cold water branch pipe and is communicated with a cold water client through a second cold water branch pipe; the controller is electrically connected with the luminosity sensor, the photovoltaic power generation device, the wind speed sensor, the wind power generation device, the power storage device, the isolating switch, the variable-frequency cooler and the cold storage device; the controller comprises a processor and a memory, wherein the memory stores a computer program, and the processor executes the program to realize the prediction control method and execute the following steps:
s1, collecting ambient light illumination through a photometric sensor to predict the generated energy of the photovoltaic power generation device;
s2, collecting environmental wind power through a wind speed sensor to predict the power generation capacity of the wind power generation device;
and S3, controlling the on-off switching power supply loop of the isolating switch according to the refrigeration power demand, adjusting the frequency of the variable frequency refrigerator, and distributing the cold water flow direction.
Preferably, in the photovoltaic and wind power generation direct current microgrid refrigeration system, when wind or sunlight exists in step S3, power generation, power utilization and refrigeration control are performed according to the following formulas: wg+Wf＞Wlmax＞Wlmin+WxcThen W isg+Wf＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wg+Wf＞WlminThen W isg+Wf＝Wl+Wxc，QK＝Ql；Wlmax＞Wg+Wf+Wxf＞WlminThen W isg+Wf+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
Preferably, a photovoltaic and wind power system as described aboveThe power generation direct current micro-grid refrigeration system generates power, uses power and controls refrigeration according to the following formulas when no wind exists and sunlight exists in step S3: wg＞Wlmax＞Wlmin+WxcThen W isg＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wg＞WlminThen W isg＝Wlmin+Wxc，QK＝Ql；Wlmax＞Wg+Wxf＞WlminThen W isg+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
Preferably, in the photovoltaic and wind power generation direct current microgrid refrigeration system, when wind and no sunlight exist in step S3, power generation, utilization and refrigeration control are performed according to the following formulas: wf＞Wlmax＞Wlmin+WxcThen W isf＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wf＞WlminThen W isf＝Wlmin+Wxc，QK＝Ql；Wlmax＞Wf+Wxf＞WlminThen W isf+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs a systemMinimum power consumption, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
Preferably, in the photovoltaic and wind power generation direct current microgrid refrigeration system, in the absence of wind and sunlight, the power generation, utilization and refrigeration control in step S3 is performed according to the following formula: wxf＞WlmaxThen W isxf＝Wlmax，Qlmax＝QK+QCc；Wlmax＞Wxf＞WlminThen W isxf＝Wl，QK＝Ql；Wxf＜WlminThen Q isK＝QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
Preferably, the photovoltaic power generation device supplies power randomly according to illumination, the wind power generation device supplies power randomly according to wind power, the power storage device is controlled by the controller to charge and discharge, the variable-frequency cooling machine is controlled by the controller to perform variable-frequency cooling, and the cold storage device is controlled by the controller to store/supply cold water.
Preferably, the controller is a programmable controller.
The photovoltaic and wind power generation direct current micro-grid refrigerating system has the following beneficial effects: the defects of traditional single-control switching and residual energy emission are overcome, the atmospheric environment is monitored in real time, the state of renewable energy sources is accurately predicted, the flow direction of ice water is reasonably distributed, and the energy utilization rate is improved.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a photovoltaic and wind power generation direct current microgrid refrigeration system.
The reference numerals and components referred to in the drawings are as follows: 1. a photometric sensor; 2. a wind speed sensor; 3. a photovoltaic power generation device; 4. a wind power generation device; 5. an electrical storage device; 6. an isolating switch; 7. a variable frequency cooler; 8. a cold storage device; 9. a controller; 10. a direct current bus bar; 11. a cold water main; 12. a cold water branch pipe; 13. a cold water client.
[ detailed description ] embodiments
The invention is further described with reference to the following examples and with reference to the accompanying drawings.
Examples
This embodiment realizes a photovoltaic and wind power generation direct current microgrid refrigerating system.
Fig. 1 is a schematic diagram of a photovoltaic and wind power generation direct current microgrid refrigeration system. As shown in fig. 1, the photovoltaic and wind power generation direct current microgrid refrigeration system of the present embodiment includes a luminosity sensor 1, a wind speed sensor 2, a photovoltaic power generation device 3, a wind power generation device 4, a power storage device 5, an isolation switch 6, a variable frequency refrigerator 7, a cold storage device 8, a controller 9, a direct current bus 10, a cold water main pipe 11, a cold water branch pipe 12, and a cold water client 13.
The photovoltaic power generation device 3, the wind power generation device 4 and the electric power storage device 5 are interconnected and communicated through a direct current bus bar 10, and an isolating switch 6 is installed on each branch; the load end variable frequency refrigerator 7 is powered in parallel; the controller 9 is electrically connected with the photovoltaic power generation device 3, the wind power generation device 4, the power storage device 5, the cold storage device 8, the luminosity sensor 1, the wind speed sensor 2, the isolating switch 6 and the variable-frequency cooler 7, the controller 9 controls and switches a power supply loop through algorithm prediction control, the frequency of the variable-frequency cooler 7 is adjusted, and the flow direction of cold energy is distributed.
The on-off of the isolating switch 6 is controlled by the luminosity sensor 1 and the wind speed sensor 2, specifically, the controller 9 predicts the generated energy of the photovoltaic power generation device 3 and the wind power generation device 4 through the luminosity sensor 1 and the wind speed sensor 2, controls the on-off of the isolating switch 6 according to the power demand, and adjusts the frequency of the variable frequency cooler 7.
The photovoltaic power generation device 3 and the wind power generation device 4 supply power randomly, the power storage device 5 charges and discharges randomly, the frequency conversion cold machine 7 converts frequency randomly, and the cold storage device 8 stores/supplies ice randomly.
Further, the controller 9 is a programmable controller, and the control logic of the controller 9 adopts an algorithmic predictive control method.
The following formula is a control logic algorithm of the photovoltaic and wind power generation direct current microgrid refrigeration system of the embodiment.
Wherein, the formula 100: the wind has sunlight to generate electricity, use electricity and control refrigeration; equation 110: the wind-free and sunlight-powered electricity generation, power utilization and refrigeration control are realized; equation 120: wind and sunshine are not provided for power generation, power utilization and refrigeration control; equation 130: and the wind-free and sunshine-free power generation, power utilization and refrigeration control are realized.
Wherein, WgIs the photovoltaic power generation; wfIs the wind power generation amount; wlmaxIs the maximum power consumption; wlminIs the minimum power consumption; wxcIs the amount of stored electricity; qlmaxIs the maximum refrigeration capacity; qKIs the cold quantity required by the client; qCcIs the cold storage capacity; wxfIs the amount of electrical storage device discharge; wlThe ice machine usually runs with electricity consumption; qlIs the usual refrigeration capacity; qCfIs the cold storage capacity of the cold storage device; qlminIs the minimum cooling capacity.
Wg+Wf＞Wlmax＞Wlmin+WxcThen W isg+Wf＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wg+Wf＞WlminThen W isg+Wf＝Wl+Wxc，QK＝Ql；Wlmax＞Wg+Wf+Wxf＞WlminThen W isg+Wf+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Equation (100).
Wg＞Wlmax＞Wlmin+WxcThen W isg＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wg＞WlminThen W isg＝Wlmin+Wxc，QK＝Ql；Wlmax＞Wg+Wxf＞WlminThen W isg+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Equation (110).
Wf＞Wlmax＞Wlmin+WxcThen W isf＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wf＞WlminThen W isf＝Wlmin+Wxc，QK＝Ql；Wlmax＞Wf+Wxf＞WlminThen W isf+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Equation (120).
Wxf＞WlmaxThen W isxf＝Wlmax，Qlmax＝QK+QCc；Wlmax＞Wxf＞WlminThen W isxf＝Wl，QK＝Ql；Wxf＜WlminThen Q isK＝QCf(ii) a Equation (130).
According to the photovoltaic and wind power generation direct current micro-grid refrigeration system controller 9, the isolating switch 6 is controlled through the luminosity sensor 1 and the wind speed sensor 2, the operation frequency of the variable frequency refrigerator 7 is adjusted, the system overcomes the defects of traditional single control switching and residual energy emission, the atmospheric environment is monitored in real time, the energy state is accurately predicted, the ice water flow direction is reasonably distributed, and the energy utilization rate is improved.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing associated hardware, and the program may be stored in a computer-readable storage medium, where the storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and additions can be made without departing from the principle of the present invention, and these should also be considered as the protection scope of the present invention.

Claims (7)

1. The utility model provides a photovoltaic and wind power generation direct current microgrid refrigerating system which characterized in that: the system comprises a luminosity sensor, a photovoltaic power generation device, an air speed sensor, a wind power generation device, a power storage device, an isolating switch, a direct-current bus, a variable-frequency cooler, a cold storage device and a controller; the photovoltaic power generation device, the wind power generation device and the electric power storage device are respectively connected with the isolating switch in series and then are interconnected and communicated through the direct-current bus bars to form a power supply loop which supplies power to the plurality of frequency conversion coolers connected in parallel; the variable-frequency coolers are connected in parallel through a cold water main pipe, and the cold water main pipe is communicated with the cold storage device through a first cold water branch pipe and is communicated with a cold water client through a second cold water branch pipe; the controller is electrically connected with the luminosity sensor, the photovoltaic power generation device, the wind speed sensor, the wind power generation device, the power storage device, the isolating switch, the variable-frequency cooler and the cold storage device; the controller comprises a processor and a memory, wherein the memory stores a computer program, and the processor executes the program to realize the prediction control method and execute the following steps:
s1, collecting ambient light illumination through a photometric sensor to predict the generated energy of the photovoltaic power generation device;
s2, collecting environmental wind power through a wind speed sensor to predict the power generation capacity of the wind power generation device;
and S3, controlling the on-off switching power supply loop of the isolating switch according to the refrigeration power demand, adjusting the frequency of the variable frequency refrigerator, and distributing the cold water flow direction.
2. The photovoltaic and wind power generation direct current microgrid cooling system of claim 1, characterized in that when sunlight exists in step S3, power generation, utilization and cooling control are performed according to the following formulas: wg+Wf＞Wlmax＞Wlmin+WxcThen W isg+Wf＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wg+Wf＞WlminThen W isg+Wf＝Wl+Wxc，QK＝ql；Wlmax＞Wg+Wf+Wxf＞WlminThen W isg+Wf+Wxf＝Wlmin，qK＝qlmin+QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
3. The photovoltaic and wind power generation direct current microgrid cooling system of claim 1, characterized in that in the absence of wind and sunlight, the power generation, utilization and cooling control of step S3 are according to the following formulas: wg＞Wlmax＞Wlmin+WxcThen W isg＝Wlmax+Wxc，Qlmax＝QK+qCc；Wlmax＞Wg＞WlminThen W isg＝Wlmin+Wxc，QK＝Ql；Wlmax＞Wg+Wxf＞WlminThen W isg+Wxf＝Wlmin，QK＝Qlmin+QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
4. The photovoltaic and wind power generation direct current microgrid cooling system of claim 1, characterized in that when wind and no sunlight exist in step S3, power generation, utilization and cooling control are performed according to the following formulas: wf＞Wlmax＞Wlmin+WxcThen W isf＝Wlmax+Wxc，Qlmax＝QK+QCc；Wlmax＞Wf＞WlminThen W isf＝Wlmin+Wxc，QK＝Ql；Wlmax＞Wf+Wxf＞WlminThen W isf+Wxf＝Wlmin，qK＝Qlmin+qCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge of the accumulator, qlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs a cold storage clothesPut the cold quantity, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
5. The photovoltaic and wind power generation direct current microgrid cooling system of claim 1, characterized in that when no wind or no sunlight exists in step S3, power generation, utilization and cooling control are performed according to the following formulas: wxf＞WlmaxThen W isxf＝Wlmax，Qlmax＝QK+QCc；Wlmax＞Wxf＞WlminThen W isxf＝Wl，QK＝Ql；Wxf＜WlminThen Q isK＝QCf(ii) a Wherein, WgIs the generated energy of the photovoltaic power generation device, WfIs the power generation capacity of the wind power generation device, WlmaxIs the maximum power consumption of the system, WlminIs the minimum power consumption of the system, WxcIs the amount of charge stored in the accumulator, QlmaxIs the maximum refrigerating capacity, Q, of the frequency conversion refrigeratorKIs the cold quantity required by the client, QCcIs the cold storage capacity of the cold storage device, WxfIs the amount of discharge of the accumulator, WlCold water client ice machine normally runs with power consumption, QlIs the normal refrigerating capacity, Q, of the ice machine at the cold water clientCfIs the cold energy of the cold storage device, QlminThe minimum refrigerating capacity of the ice machine at the cold water client side is obtained.
6. A photovoltaic and wind powered dc microgrid cooling system according to any of claims 2 to 4, characterized in that: the photovoltaic power generation device supplies power randomly according to illumination, the wind power generation device supplies power randomly according to wind power, the electric power storage device is controlled by the controller to charge and discharge, the variable-frequency cooling machine is controlled by the controller to perform variable-frequency cooling, and the cold storage device is controlled by the controller to store/supply cold water.
7. A photovoltaic and wind powered dc microgrid cooling system according to any one of claims 1 to 5, characterized in that: the controller adopts a programmable controller.
CN202210038729.2A 2022-01-13 2022-01-13 Photovoltaic and wind power generation direct current micro-grid refrigerating system Pending CN114243700A (en)

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