Working medium storage type refrigeration and cooling decoupling system and control method

Abstract

The application provides a working medium storage type refrigeration and cooling decoupling system and a control method, comprising: a refrigeration system; a refrigerant storage system; a refrigerant absorption storage system, the capacity of which is matched with that of the refrigerant storage system; and a refrigerant desorption storage system, the capacity of which is matched with that of the refrigerant storage system. The refrigerant storage system, the refrigerant absorption storage system and the refrigerant desorption storage system constitute a working medium storage system, which is used for storing refrigerant, a concentrated refrigerant solution and a dilute refrigerant solution. The three independent and matched storage systems are used to realize the decoupling of refrigeration and cooling, and the working medium storage system is used to provide cooling on demand according to the demand of a user side, and the adjustability is high. The refrigeration system with the working medium storage system is used to formulate a cooling control instruction in accordance with the current state of a power grid based on power grid operation information, and the excess electric energy is stored in the form of cold storage. When the electric energy is short, the working medium storage system is used to provide cooling preferentially, and the coupled operation of the power grid and the cooling is realized.

Description

Technical Field

[0001] This invention belongs to the field of new power system technology, and in particular relates to a decoupled system for refrigeration and cooling supply in a working fluid storage type and a control method. Background Technology

[0002] Interruptible loads are considered an important means of building virtual power plants, participating in the regulation of new power systems, and promoting the development of integrated energy systems.

[0003] Refrigeration systems play an indispensable role in industry, agriculture, and services. However, most current refrigeration systems have very limited adjustment capabilities and are largely unable to meet the rigid demands of users with cooling loads, placing a significant burden on the power grid. Although a series of new energy storage refrigeration systems, such as ice storage and water storage, have emerged in recent years, their low energy efficiency and poor adjustability fail to support the demands of the high-efficiency development of new power systems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a working fluid storage-type refrigeration and cooling supply decoupling system and control method. It mainly solves the problems of low energy efficiency or difficulty in achieving refrigeration and cooling supply decoupling when facing the demand for deep participation in grid peak regulation through advanced and efficient system design concept.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a refrigerant-storage type refrigeration and cooling decoupling system, comprising:

[0007] Refrigeration system;

[0008] Refrigerant storage system;

[0009] The capacity of the refrigerant absorption and storage system is matched with that of the refrigerant storage system.

[0010] The refrigerant desorption intermediate storage system has a capacity that matches the refrigerant intermediate storage system.

[0011] In some embodiments, the refrigeration system is an absorption refrigeration system or an adsorption refrigeration system;

[0012] The refrigeration system is driven by a compression heat pump system.

[0013] In some embodiments, the refrigerant storage system is connected to the condenser outlet of the refrigeration system via a pipeline for storing the refrigerant at the condenser outlet.

[0014] In some embodiments, the refrigerant absorption and storage system includes an absorber and a refrigerant concentrate storage device;

[0015] The refrigerant concentrated solution storage device is connected to the pipeline downstream of the absorber to the generator via a pipeline. Its capacity can accommodate the refrigerant concentrated solution generated after all the refrigerant in the refrigerant storage system has undergone throttling expansion, evaporation and heat absorption, and is completely absorbed by the refrigerant dilute solution.

[0016] In some embodiments, the refrigerant concentrated solution storage device is located at the lower part of the absorber, and collects the refrigerant concentrated solution generated by the absorption of refrigerant vapor by the absorber by gravity.

[0017] In some embodiments, the refrigerant desorption storage system includes a generator and a refrigerant dilute solution storage device, wherein the refrigerant dilute solution storage device is connected to the pipeline downstream of the generator to the evaporator via a pipeline; its capacity can accommodate the refrigerant dilute solution generated after all the refrigerant concentrated solution in the refrigerant absorption storage system has undergone desorption heat.

[0018] In some embodiments, the refrigerant dilute solution storage device is located at the lower part of the generator, and collects the refrigerant dilute solution generated by the desorption of refrigerant through the generator by gravity.

[0019] In some embodiments, the refrigeration system includes an evaporator whose total capacity matches the sum of the equivalent refrigeration capacity of the refrigerant storage system and the equivalent refrigeration capacity of the refrigeration system generator at full load.

[0020] In some embodiments, including:

[0021] A heat storage system is used to collect and store the heat emitted by the condenser of the refrigeration system and to supply heat to the evaporator of the compression heat pump system in response to the operating parameters of the compression heat pump system.

[0022] Secondly, the present invention provides a medium-temperature storage type refrigeration and cooling decoupling system, comprising:

[0023] A working fluid storage system, wherein the working fluid includes a refrigerant and an absorbent / adsorption carrier;

[0024] A refrigeration system that selectively stores the working fluid in the working fluid storage device;

[0025] The control and interaction system is used to collect power grid operation information and formulate cooling control commands and load control commands based on cooling regulation strategies.

[0026] The refrigeration system is configured to adjust refrigeration operating parameters in response to the load control command;

[0027] The cooling control system is configured to control the refrigeration system and the working fluid storage system to supply cooling externally independently or jointly in response to the cooling control command.

[0028] In some embodiments, the refrigeration system is an absorption or adsorption refrigeration system driven by an electrically driven compression heat pump system.

[0029] In some embodiments, the control interaction system is further configured to collect cooling load demand feedback from the user side and adjust the cooling control strategy.

[0030] In some embodiments, the electric drive module of the refrigeration system is configured to be controlled by the power grid side.

[0031] Thirdly, the present invention provides a decoupling control method for a working fluid-based refrigeration and cooling system, applied to the aforementioned working fluid-based refrigeration and cooling system, comprising the following steps:

[0032] Collect power grid operation information to determine the power grid operation status. s Determine the total capacity C of the refrigerant storage system, which is either a state of power surplus, power shortage, or an intermediate state of power. ca and current reserves C s Determine the cooling load demand L ac ;

[0033] If the power grid operation status is G s In the event of a power surplus, the electric-driven refrigeration system is activated to provide cooling to the outside.

[0034] If the power grid operation status is G s In the event of a power shortage, refrigerant is supplied by a refrigerant storage system for refrigeration and cooling, and the resulting high-concentration absorbent is stored by the refrigerant absorption and storage system.

[0035] If the power grid operation status is G s As an intermediate state of electricity, predict the power grid operating conditions G for a future time period. s ˋ, Calculate the cooling demand L in the future time period. ac ·t s Converted into refrigerant demand, and compared with the refrigerant storage C s A comparison is performed, and the refrigeration system is controlled based on the comparison results.

[0036] In some embodiments, if the power grid operating condition G s In a state of power surplus, the electric-driven refrigeration system is activated to directly meet the cooling load demand. ac And based on the remaining capacity of the refrigerant storage system (C ca -C s Store it.

[0037] In some embodiments, if the power grid operating condition G sIn a power shortage situation, refrigerant is supplied by a refrigerant storage system for cooling. When the current refrigerant storage level C... s Unable to meet cooling load demand L ac Turn on the electric refrigeration system to supplement the cooling load demand. ac The remaining gap.

[0038] In some embodiments, if the power grid operating condition G s As an intermediate state of electricity, predict the power grid operating conditions G for a future time period. s ˋ;

[0039] If the power grid operating condition G is predicted for a future period... s ˋ indicates a power shortage state, with a power shortage duration of t. s Calculate the cooling demand L in the future time period. ac ·t s When the current refrigerant storage C s Can meet cooling demand L ac ·t s The refrigerant is supplied by the refrigerant storage system for refrigeration; when the current refrigerant storage level C... s Unable to meet cooling demand L ac ·t s The electric-driven refrigeration system is activated to provide external cooling, and the cooling demand L is adjusted according to future demand. ac ·t s -C s For cold storage;

[0040] If the power grid operating condition G is predicted for a future period... s In a state of power surplus, refrigerant is supplied by the refrigerant storage system for cooling; if the current refrigerant storage level C... s Unable to meet cooling load demand L ac Turn on the electric refrigeration system to supplement the cooling load demand. ac The remaining gap.

[0041] In some embodiments, the cooling load demand L ac It is set by the user.

[0042] By optimizing the software, we can analyze the cooling load demand L at different times on the user side. ac Develop cooling supply control strategies based on time periods;

[0043] By combining grid operation information and cooling control strategies, the electric drive module of the cooling system is controlled by the grid side.

[0044] In some embodiments, the user side may revoke the grid side's control over the refrigeration system and gain independent control.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] In the refrigeration system, a medium-level storage system is constructed to store refrigerant, concentrated refrigerant solution, and dilute refrigerant solution respectively. By using three independent and matched medium-level storage systems, the refrigeration and cooling supply are decoupled, and cooling is supplied on demand according to the user's needs, with strong adjustability.

[0047] By utilizing a refrigeration system with a working fluid storage system, and based on grid operation information, cooling control commands that conform to the current grid status are formulated. Excess electrical energy is stored through cold storage, and when there is a power shortage, the working fluid storage system is used first for cooling, thus realizing the coupled operation of the grid and cooling.

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0049] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the framework of a working fluid-based refrigeration and cooling decoupling system provided in this embodiment.

[0051] Figure 2 This is a flowchart illustrating a decoupling control method for a working fluid-based refrigeration system. Detailed Implementation

[0052] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may not be directly connected to the other devices but may have an intermediary device.

[0055] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0056] Firstly, referring to Figure 1 This invention provides a working fluid-based storage-type refrigeration and cooling decoupling system, comprising:

[0057] Refrigeration system;

[0058] A refrigerant storage system for storing refrigerant; preferably, for storing liquid refrigerant;

[0059] The capacity of the refrigerant absorption and storage system is matched with that of the refrigerant storage system.

[0060] The refrigerant desorption intermediate storage system has a capacity that matches the refrigerant intermediate storage system.

[0061] It should be noted that the refrigerant storage system, refrigerant absorption storage system, and refrigerant desorption storage system are all coupled to the refrigeration system, and are used to store refrigerant, concentrated refrigerant solution, and dilute refrigerant solution, respectively. These three storage systems can be coupled or decoupled from the refrigeration system individually according to actual needs. In order to achieve this, the capacity of the refrigerant absorption storage system and the refrigerant desorption storage system must be matched with that of the refrigerant storage system. That is, when the refrigeration system is not performing refrigeration and only provides cooling through the refrigerant storage system, the refrigerant absorption storage system and / or the refrigerant desorption storage system need to be able to accommodate all the refrigerant in the refrigerant storage system.

[0062] Preferably, the refrigeration system is an absorption refrigeration system or an adsorption refrigeration system; the refrigerant is absorbed or adsorbed by an absorbent or adsorbent as a carrier.

[0063] The refrigeration system is driven by a compression heat pump system, which provides heat so that the refrigerant can escape from the absorbent or adsorbent again and be recycled.

[0064] In this embodiment, the refrigeration system includes an evaporator, an absorber, a solution pump, a pressure reducing valve, a generator, a condenser, and a throttling valve, forming a conventional absorption refrigeration system or an adsorption refrigeration system.

[0065] The refrigerant storage system is connected to the condenser outlet of the refrigeration system via a pipeline and is used to store the refrigerant at the condenser outlet.

[0066] Preferably, the refrigerant storage system is a liquid storage tank.

[0067] In this embodiment, the refrigerant absorption and storage system includes an absorber and a refrigerant concentrate storage device; wherein, the absorber is the same as the absorber in the refrigeration system;

[0068] The refrigerant concentrated solution storage device is connected to the pipeline downstream of the absorber to the generator via a pipeline. Its capacity can accommodate the refrigerant concentrated solution produced after all the refrigerant in the refrigerant concentrated solution system has undergone throttling expansion and evaporation heat absorption and is completely absorbed by the refrigerant dilute solution. When all the refrigerant vapor obtained after all the refrigerant in the refrigerant concentrated solution system has undergone throttling expansion and evaporation heat absorption and is absorbed by the refrigerant dilute solution, a refrigerant concentrated solution is formed. The total capacity of the refrigerant concentrated solution storage device must accommodate this refrigerant concentrated solution.

[0069] Preferably, the refrigerant concentrated solution storage device is located at the lower part of the absorber. It collects the refrigerant concentrated solution generated by the absorption of refrigerant vapor by the absorber under the action of gravity. The absorber itself contains a dilute refrigerant solution. After absorbing refrigerant vapor, a refrigerant concentrated solution is generated. Due to gravity, the refrigerant concentrated solution flows downward into the refrigerant concentrated solution storage device, and is then transported by a solution pump.

[0070] In this embodiment, the refrigerant desorption and storage system includes a generator and a refrigerant dilute solution storage device; wherein, the generator is the same as the generator in the refrigeration system;

[0071] The refrigerant dilute solution storage device is connected to the pipeline downstream of the generator to the evaporator via a pipeline; its capacity can accommodate the refrigerant dilute solution generated after the desorption heat of all the refrigerant concentrated solution in the refrigerant absorption storage system; when all the refrigerant concentrated solution in the refrigerant absorption storage system is transported to the generator for endothermic desorption, the refrigerant enters the condenser in the form of vapor, and the remaining refrigerant dilute solution enters the refrigerant dilute solution storage device to continue to the next absorption and adsorption cycle.

[0072] Preferably, the refrigerant dilute solution storage device is located at the lower part of the generator, and collects the refrigerant dilute solution generated by the desorption of refrigerant through the generator by gravity.

[0073] In one implementation, the refrigeration system includes an evaporator. The total capacity of the evaporator is matched with the sum of the equivalent refrigeration capacity of the refrigerant storage system and the equivalent refrigeration capacity of the refrigeration system generator at full load. It should be noted that the total capacity of the refrigerant storage system represents a portion of the refrigeration capacity of this refrigeration system, and the generator at full load also represents a portion of the refrigeration capacity of this refrigeration system. The sum of these two is used as the matching standard for the total capacity of the evaporator in this refrigeration system, so that when the refrigerant storage system, refrigerant absorption storage system, or refrigerant desorption storage system is decoupled, the evaporator can meet the current load demand and provide cooling.

[0074] As one implementation method, it also includes:

[0075] A heat storage system is used to collect and store the heat emitted by the condenser of the refrigeration system and, in response to the operating parameters of the compression heat pump system, supply heat to the evaporator of the compression heat pump system to improve thermal efficiency.

[0076] Combination Figure 1 Secondly, embodiments of the present invention provide a working fluid-based storage-type refrigeration and cooling decoupling system, comprising:

[0077] The working fluid storage system includes a refrigerant and an absorption / adsorption carrier; wherein the absorption / adsorption carrier is divided into two types: absorbent and adsorbent, depending on the type of refrigeration system; the working fluid storage system includes a refrigerant storage system, a refrigerant absorption storage system, and a refrigerant desorption storage system.

[0078] The refrigeration system selectively stores the working fluid in the working fluid storage device; that is, it can first store refrigerant in the refrigerant storage system, and then use the refrigerant in the refrigerant storage system to transport to the evaporator, store a concentrated refrigerant solution in the refrigerant absorption storage system, and then use the concentrated refrigerant solution in the refrigerant absorption storage system to transport to the generator to produce a dilute refrigerant solution, which is stored in the refrigerant desorption storage system.

[0079] The control and interaction system is used to collect power grid operation information and formulate cooling control commands and load control commands based on cooling regulation strategies.

[0080] The refrigeration system is configured to adjust refrigeration operating parameters in response to the load control command;

[0081] The cooling control system is configured to control the refrigeration system and the working fluid storage system to supply cooling externally independently or jointly in response to the cooling control command.

[0082] It should be noted that in this decoupled cooling and heat supply system using a storage-type refrigerant, a control interaction system is used for comprehensive control. This system collects grid operation information on one hand, and cooling load demand feedback from the user side on the other. Based on the cooling regulation strategy, it formulates cooling control commands and load control commands; among which:

[0083] A cooling control command is sent to the cooling control system, which responds to the command by controlling the refrigeration system and the refrigerant storage system to provide cooling independently or jointly. When the refrigeration system provides cooling independently, the refrigerant is directly delivered as liquid refrigerant to the expansion valve and then to the evaporator for cooling. When the refrigerant storage system provides cooling independently, the refrigerant is directly delivered from the refrigerant storage system to the expansion valve and then to the evaporator for cooling. When the refrigeration system and the refrigerant storage system provide cooling jointly, the refrigeration system stores cold air in the refrigerant storage system.

[0084] A load control command is sent to the refrigeration system, and the refrigeration system responds to the load control command by adjusting the refrigeration operating parameters;

[0085] Preferably, the refrigeration system is an absorption or adsorption refrigeration system driven by an electric compression heat pump system. The absorption or adsorption refrigeration system is driven by the electric compression heat pump system, which is equivalent to the electric drive module of the refrigeration system. Specifically, the electric drive module is controlled by the power grid side.

[0086] Since this working fluid storage-type refrigeration decoupling system needs to be deeply involved in grid peak regulation, this refrigeration system is set as an absorption or adsorption refrigeration system driven by an electric compression heat pump system. The operating parameters of the electric compression heat pump system are defined as refrigeration operating parameters, which are adjusted according to load control commands to adjust the heat load in the generator and control the amount of refrigerant vapor and refrigerant dilute solution produced.

[0087] When the cost of electric-driven refrigeration is low, the refrigeration system should be operated at full load first.

[0088] When the cooling load demand is not higher than the cooling load corresponding to the maximum load of the refrigeration system generator, the excess low-concentration absorbent generated after refrigerant desorption is stored in the refrigerant desorption intermediate storage system, and the excess refrigerant generated by the refrigeration system condenser is stored in the refrigerant intermediate storage system.

[0089] When the cooling load demand exceeds the cooling load corresponding to the maximum load of the refrigeration system generator, the insufficient refrigerant is supplemented by the refrigerant storage system, and the excess high refrigerant concentration absorbent is stored by the refrigerant absorption storage system.

[0090] When the cost of electric refrigeration is high, the refrigerant storage system is used to supply refrigerant for refrigeration. The high refrigerant concentration absorbent generated is stored by the refrigerant absorption storage system. When the refrigerant in the refrigerant storage system is insufficient, the refrigeration system is started to provide cooling.

[0091] Combination Figure 2 Thirdly, embodiments of the present invention provide a method for decoupling control of refrigeration and cooling supply in a working fluid-based storage system, applied to a working fluid-based storage refrigeration and cooling supply decoupling system as described above, comprising the following steps:

[0092] Collect power grid operation information to determine the power grid operation status. s Determine the total capacity C of the refrigerant storage system, which is either a state of power surplus, power shortage, or an intermediate state of power. ca and current reserves C s Determine the cooling load demand L ac The above steps are collected, processed, and analyzed by the control and interaction system.

[0093] If the power grid operation status is G s In the case of a power surplus, the electric-driven refrigeration system is turned on to provide cooling to the outside. Since there is a power surplus and the power grid has abundant power, the power can be used first. Therefore, the absorption or adsorption refrigeration system driven by the electric-driven compression heat pump system is turned on directly.

[0094] If the power grid operation status is G s In the event of a power shortage, refrigerant is supplied by the refrigerant storage system for cooling. The resulting high-concentration absorbent is stored by the refrigerant absorption storage system. Due to the power shortage, starting the electric-driven compression heat pump system would further exacerbate the power shortage. Therefore, it is necessary to prioritize the use of refrigerant from the refrigerant storage system for cooling.

[0095] If the power grid operation status is G s As an intermediate state of electricity, predict the power grid operating conditions G for a future time period. s ˋ, Calculate the cooling demand L in the future time period.ac ·t s Converted into refrigerant demand, and compared with the refrigerant storage C s A comparison is performed, and the cooling system is controlled based on the comparison results. Under intermediate power conditions, a forecast of a set future time period is required, which could be one hour or three hours, predicting the power grid operation status G within this set future time period. s ˋ, Calculate the corresponding cooling demand L ac ·t s Converted into refrigerant demand, and compared with the current refrigerant reserves C s Only by comparing the data can we formulate the corresponding control commands.

[0096] As one implementation method, if the power grid operating condition G s In a state of power surplus, the electric-driven refrigeration system is activated to directly meet the cooling load demand. ac And based on the remaining capacity of the refrigerant storage system (C ca -C s Store it.

[0097] As one implementation method, if the power grid operating condition G s In a power shortage situation, refrigerant is supplied by a refrigerant storage system for cooling. When the current refrigerant storage level C... s Unable to meet cooling load demand L ac Turn on the electric refrigeration system to supplement the cooling load demand. ac The remaining gap.

[0098] As one implementation method, if the power grid operating condition G s As an intermediate state of electricity, predict the power grid operating conditions G for a future time period. s ˋ;

[0099] If the power grid operating condition G is predicted for a future period... s ˋ indicates a power shortage state, with a power shortage duration of t. s Calculate the cooling demand L in the future time period. ac ·t s When the current refrigerant storage C s Can meet cooling demand L ac ·t s The refrigerant is supplied by the refrigerant storage system for refrigeration; when the current refrigerant storage level C... s Unable to meet cooling demand L ac ·t s The electric-driven refrigeration system is activated to provide external cooling, and the cooling demand L is adjusted according to future demand. ac ·t s -Cs For cold storage;

[0100] If the power grid operating condition G is predicted for a future period... s In a state of power surplus, refrigerant is supplied by the refrigerant storage system for cooling; if the current refrigerant storage level C... s Unable to meet cooling load demand L ac Turn on the electric refrigeration system to supplement the cooling load demand. ac The remaining gap.

[0101] As one implementation method, the cooling load demand L ac It is set by the user.

[0102] Therefore, by optimizing the software, we can analyze the cooling load demand L at different times on the user side. ac Develop cooling supply control strategies based on time periods;

[0103] By combining grid operation information and cooling control strategies, the electric drive module of the cooling system is controlled by the grid side.

[0104] It should be noted that users can set their cooling load demand L according to their usage needs and habits, and in different time periods. ac For example, when people need to use air conditioning to sleep in the summer, the cooling load demand is higher in the first 4 hours and lower in the last 4 hours. Matching this usage habit with the power generation situation of the power grid, the power grid may be tighter in the first half of the night and more abundant in the second half. Combining the above power grid operation information and cooling control strategies, the electric drive module of the corresponding cooling system can be controlled in a targeted manner. It is equivalent to the cooling system, which was originally controlled by the user side, being controlled by the power grid side. The power grid side can actively control the cooling system based on the actual power grid operation information and the user's cooling demand to achieve medium-temperature storage cooling and decouple cooling supply and cooling.

[0105] Preferably, the user side can release the grid side's control over the refrigeration system and gain self-control. After releasing the grid side's control, the user side can control it independently, which means that the user side can decide whether its refrigeration system is connected to the grid side for control.

[0106] In summary, compared with the prior art, the above embodiments provide a working fluid storage-type refrigeration and cooling decoupling system and control method. In the refrigeration system, a working fluid storage system is constructed to store refrigerant, concentrated refrigerant solution and dilute refrigerant solution respectively. By using three independent and matched storage systems, the refrigeration and cooling supply are decoupled. Cooling is supplied on demand according to the user's needs, and the adjustability is strong.

[0107] By utilizing a refrigeration system with a working fluid storage system, and based on grid operation information, cooling control commands that conform to the current grid status are formulated. Excess electrical energy is stored through cold storage, and when there is a power shortage, the working fluid storage system is used first for cooling, thus realizing the coupled operation of the grid and cooling.

[0108] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for decoupling and controlling a refrigerant-based refrigeration and cooling system with a refrigerant-based storage system, applied to such a system, which includes a refrigeration system, a refrigerant storage system, a refrigerant absorption storage system, and a refrigerant desorption storage system, characterized in that... Includes the following steps: Collect power grid operation information to determine the power grid's operating status. G s Determine the total capacity of the refrigerant storage system, identifying one of the following states: power surplus, power shortage, or intermediate power conditions. C ca and current reserves C s Determine the cooling load demand. L ac ; If the power grid is in operation G s In the event of a power surplus, the electric-driven refrigeration system is activated to provide cooling to the outside. If the power grid is in operation G s In the event of a power shortage, refrigerant is supplied by a refrigerant storage system for refrigeration and cooling, and the resulting high-concentration absorbent is stored by the refrigerant absorption and storage system. If the power grid is in operation G s As an intermediate state of electricity, predict the operating conditions of the power grid for a specified future period. G s Calculate the cooling demand for a given future time period. L ac t s Converted into refrigerant demand, and compared with the refrigerant reserves. C s A comparison is performed, and the refrigeration system is controlled based on the comparison results.

2. The decoupling control method for refrigeration and cooling supply in a working fluid storage system as described in claim 1, characterized in that, If the power grid is in operation G s In cases of power surplus, the electric-driven refrigeration system is activated to directly meet the cooling load demand. L ac And based on the remaining capacity of the refrigerant storage system ( C ca - C s ) for storage.

3. The decoupling control method for refrigeration and cooling supply in a working fluid storage system as described in claim 1, characterized in that, If the power grid is in operation G s In the event of a power shortage, refrigerant is supplied by a refrigerant storage system for cooling. The current refrigerant storage level... C s Unable to meet cooling load demand L ac Turn on the electric refrigeration system to supplement the cooling load demand. L ac The remaining gap.

4. The decoupling control method for refrigeration and cooling supply in a working fluid storage system as described in claim 1, characterized in that, If the power grid is in operation G s As an intermediate state of electricity, predict the operating conditions of the power grid for a specified future period. G s `; If the power grid operating conditions for a future period are predicted... G s The power shortage is in effect, and the duration of the power shortage is... t s Calculate and set the cooling demand in the future time period L ac t s When the current refrigerant reserves C s Able to meet cooling demand L ac t s The refrigerant is supplied by the refrigerant storage system for refrigeration; when the current refrigerant storage level is... C s Unable to meet cooling demand L ac t s The electric-driven refrigeration system is activated to provide external cooling, and adjustments are made based on future cooling demand gaps. L ac t s - C s For cold storage; If the power grid operating conditions for a future period are predicted... G s In a state of power surplus, refrigerant is supplied by the refrigerant storage system for cooling; if the current refrigerant storage level... C s Unable to meet cooling load demand L ac Turn on the electric refrigeration system to supplement the cooling load demand. L ac The remaining gap.

5. A decoupling control method for refrigeration and cooling supply in a working fluid storage system as described in any one of claims 1 to 4, characterized in that, The cooling load demand L ac It is set by the user. By optimizing the software, we can analyze the cooling load demand of users at different times. L ac Develop cooling supply control strategies based on time periods; By combining grid operation information and cooling control strategies, the electric drive module of the cooling system is controlled by the grid side.

6. The decoupling control method for refrigeration and cooling supply in a working fluid storage system as described in claim 5, characterized in that, The user side can revoke the grid side's control over the refrigeration system and gain independent control.

7. A working fluid-based storage-type refrigeration and cooling decoupling system for power grid peak shaving, employing the method described in any one of claims 1 to 6, characterized in that, include: Refrigeration system; Refrigerant storage system; The capacity of the refrigerant absorption and storage system is matched with that of the refrigerant storage system. The refrigerant desorption intermediate storage system has a capacity that matches the refrigerant intermediate storage system. The refrigeration system is an absorption refrigeration system or an adsorption refrigeration system; The refrigeration system is driven by a compression heat pump system.

8. The working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 7, characterized in that, The refrigerant storage system is connected to the condenser outlet of the refrigeration system via a pipeline and is used to store the refrigerant at the condenser outlet.

9. A working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 7, characterized in that, The refrigerant absorption and storage system includes an absorber and a refrigerant concentrated solution storage device; The refrigerant concentrated solution storage device is connected to the pipeline downstream of the absorber to the generator via a pipeline. Its capacity can accommodate the refrigerant concentrated solution generated after all the refrigerant in the refrigerant storage system has undergone throttling expansion, evaporation and heat absorption, and is completely absorbed by the refrigerant dilute solution.

10. A working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 9, characterized in that, The refrigerant concentrated solution storage device is located at the bottom of the absorber and collects the refrigerant concentrated solution generated by the absorber absorbing refrigerant vapor by gravity.

11. A working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 7, characterized in that, The refrigerant desorption storage system includes a generator and a refrigerant dilute solution storage device. The refrigerant dilute solution storage device is connected to the pipeline downstream of the generator to the evaporator via a pipeline. Its capacity can accommodate the refrigerant dilute solution generated after the desorption heat of all the concentrated refrigerant solution in the refrigerant absorption storage system.

12. The working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 11, characterized in that, The refrigerant dilute solution storage device is located at the bottom of the generator and collects the refrigerant dilute solution generated by the desorption of refrigerant through the generator by gravity.

13. The working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 7, characterized in that, The refrigeration system includes an evaporator, the total capacity of which matches the sum of the equivalent refrigeration capacity of the refrigerant storage system and the equivalent refrigeration capacity of the refrigeration system generator at full load.

14. The working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 7, characterized in that, include: A heat storage system is used to collect and store the heat emitted by the condenser of the refrigeration system and to supply heat to the evaporator of the compression heat pump system in response to the operating parameters of the compression heat pump system.

15. A medium-temperature storage refrigeration and cooling decoupling system for power grid peak shaving, using the method described in any one of claims 1 to 6, characterized in that, include: A working fluid storage system, wherein the working fluid includes a refrigerant and an absorbent / adsorption carrier; A refrigeration system that selectively stores the working fluid in the working fluid storage device; The control and interaction system is used to collect power grid operation information and formulate cooling control commands and load control commands based on cooling regulation strategies. The refrigeration system is configured to adjust refrigeration operating parameters in response to the load control command; The cooling control system is configured to control the refrigeration system and the working fluid storage system to supply cooling externally independently or jointly in response to the cooling control command.

16. A working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 15, characterized in that, The refrigeration system is an absorption or adsorption refrigeration system driven by an electrically driven compression heat pump system.

17. A working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 15, characterized in that, The control and interaction system is also configured to collect cooling load demand feedback from the user side and adjust the cooling control strategy accordingly.

18. A working fluid-intermediate storage type refrigeration and cooling decoupling system as described in claim 16, characterized in that, The electric drive module of the refrigeration system is configured to be controlled by the power grid.

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