Method and device for controlling cogeneration system and cogeneration system

Abstract

The invention relates to a control method and device of a combined heat and power generation system and the combined heat and power generation system. The combined heat and power generation system comprises a fused salt heat storage system and a thermal power generating unit, and the method comprises the steps that in the steam supply process of the fused salt heat storage system, system parameters of the fused salt heat storage system are obtained; when it is determined that the fused salt heat storage system meets the steam supply lower limit condition based on the system parameters, the fused salt heat storage system is controlled to supply steam at the system rate, and the thermal power generating unit is controlled to supply steam at the first rate; wherein the system rate is smaller than the rate before the fused salt heat storage system supplies steam at the system rate; under the condition that the fused salt heat storage system supplies steam at the system rate, if the fused salt heat storage system meets the steam supply upper limit condition, the fused salt heat storage system is controlled to stop supplying steam, and the thermal power generating unit is controlled to supply steam at the second rate until the sum of the total steam supply amount of the thermal power generating unit and the total steam supply amount of the fused salt heat storage system is matched with the steam supply requirement of the combined heat and power generation system; the second rate is greater than the first rate. The method can improve the operation stability of the power grid.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a control method and device for a cogeneration system, a cogeneration system, a computer device, a computer-readable storage medium, and a computer program product. Background Art

[0002] Molten salt heat storage systems can participate in peak-shaving operations for power grids. For example, they can flexibly adjust steam production based on changes in power system load demand, allowing the electricity output from these adjustments to maintain grid supply and demand balance and frequency stability. As a critical regulatory resource for power systems, the peak-shaving capabilities of molten salt heat storage systems directly impact the safe and economical operation of the grid.

[0003] However, the molten salt heat storage system has limited steam output during peak load regulation, which will reduce the stability of power grid operation. Summary of the Invention

[0004] Based on this, it is necessary to provide a control method, device, cogeneration system, computer equipment, computer-readable storage medium and computer program product for a cogeneration system that can improve the stability of power grid operation in response to the above technical problems.

[0005] In a first aspect, the present application provides a control method for a cogeneration system, comprising:

[0006] During the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system;

[0007] When it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate;

[0008] When the molten salt heat storage system supplies steam at a system rate, if the molten salt heat storage system meets a steam supply upper limit condition, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

[0009] In one embodiment, the system parameters include a first molten salt heat storage capacity; and determining, based on the system parameters, that the molten salt heat storage system meets the steam supply lower limit condition includes:

[0010] Determining a first threshold value based on a renewable energy power generation operating condition corresponding to the molten salt heat storage system;

[0011] When the first molten salt heat storage amount is less than or equal to a first threshold, it is determined that the molten salt heat storage system meets the steam supply lower limit condition.

[0012] In one embodiment, the method further comprises:

[0013] When the molten salt heat storage system supplies steam at a system rate, obtaining a second molten salt heat storage amount of the molten salt heat storage system;

[0014] When the second molten salt heat storage amount is less than or equal to a second threshold, it is determined that the molten salt heat storage system meets the steam supply upper limit condition.

[0015] In one embodiment, the method further comprises:

[0016] Acquiring historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each of the historical steam supply months;

[0017] The system rate is determined based on the historical steam supply rates corresponding to the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

[0018] In one embodiment, after controlling the molten salt thermal storage system to stop supplying steam, the method further includes:

[0019] Obtaining the current heat storage capacity and the current molten salt temperature of the molten salt heat storage system;

[0020] Based on the current molten salt temperature, adjusting the electric heating power of the molten salt heat storage system so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range;

[0021] The molten salt heat storage system is controlled to operate at the adjusted electric heating power, and the process returns to the step of obtaining the current heat storage capacity of the molten salt heat storage system until the new current heat storage capacity reaches the upper limit of the heat storage capacity.

[0022] In one embodiment, the method further comprises:

[0023] When the thermal power generation unit supplies steam at a second rate, obtaining the power generation of each thermal power generation unit within each preset time period;

[0024] In the case where the power generation shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, the thermal power unit is controlled to stop supplying steam, and the molten salt heat storage system is controlled to resume supplying steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply;

[0025] The remaining steam supply is the difference between the total steam supply of the thermal power unit and the current steam supply of the thermal power unit.

[0026] In a second aspect, the present application provides a control device for a cogeneration system, wherein the cogeneration system includes a molten salt heat storage system and a thermal power unit, and the device includes:

[0027] An acquisition module, configured to acquire system parameters of the molten salt heat storage system during a steam supply process of the molten salt heat storage system;

[0028] a first control module, configured to, when it is determined based on the system parameters that the molten salt heat storage system satisfies a lower steam supply limit condition, control the molten salt heat storage system to supply steam at a system rate, and control the thermal power unit to supply steam at a first rate; wherein the system rate is less than a rate of the molten salt heat storage system before supplying steam at the system rate;

[0029] a second control module, configured to, when the molten salt heat storage system supplies steam at a system rate and, if the molten salt heat storage system meets a steam supply upper limit condition, control the molten salt heat storage system to stop supplying steam and control the thermal power unit to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate being greater than the first rate.

[0030] In a third aspect, the present application provides a cogeneration system, which includes a molten salt heat storage system, a thermal power unit, and a control device;

[0031] The molten salt heat storage system includes an electrically heated molten salt heat exchanger, a first salt tank, a second salt tank and a molten salt steam generating device; the electrically heated molten salt heat exchanger is connected to a new energy abandoned electricity collection device, and the new energy abandoned electricity collection device is used to collect new energy abandoned electricity; the first end of the first salt tank is connected to the first end of the second salt tank through the molten salt steam generating device, and the second end of the second salt tank is connected to the second end of the first salt tank through the electrically heated molten salt heat exchanger;

[0032] The control device is used to control the molten salt heat storage system and the thermal power unit to implement the first aspect or the steps of any one of the methods of the first aspect.

[0033] In one embodiment, the system further includes: a first steam turbine; the thermal power unit and the molten salt steam generating equipment are connected to a first generator via the first steam turbine; the thermal power unit and the molten salt steam generating equipment are also connected to user equipment.

[0034] In a fourth aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0035] During the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system;

[0036] When it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate;

[0037] When the molten salt heat storage system supplies steam at a system rate, if the molten salt heat storage system meets a steam supply upper limit condition, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

[0038] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0039] During the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system;

[0040] When it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate;

[0041] When the molten salt heat storage system supplies steam at a system rate, if the molten salt heat storage system meets a steam supply upper limit condition, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

[0042] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the following steps:

[0043] During the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system;

[0044] When it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate;

[0045] When the molten salt heat storage system supplies steam at a system rate, if the molten salt heat storage system meets a steam supply upper limit condition, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

[0046] The control method, apparatus, cogeneration system, computer equipment, computer-readable storage medium, and computer program product for a cogeneration system are described above. The method obtains system parameters of the molten salt heat storage system during the steam supply process of the molten salt heat storage system, and when it is determined based on the system parameters that the molten salt heat storage system meets a lower steam supply limit condition, controls the molten salt heat storage system to supply steam at a system rate, and controls the thermal power unit to supply steam at a first rate. The system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate, and when the molten salt heat storage system is supplying steam at the system rate, if the molten salt heat storage system meets an upper steam supply limit condition, controls the molten salt heat storage system to stop supplying steam, and controls the thermal power unit to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system. Thus, by combining the thermal power unit and the molten salt heat storage system to jointly assume the steam supply task of the power grid, the problem of low power grid operation stability caused by the molten salt heat storage system performing the steam supply task alone can be solved, thereby improving the steam supply stability of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A schematic structural diagram of a cogeneration system in one embodiment;

[0049] Figure 2 1 is a flow chart of a control method for a cogeneration system in one embodiment;

[0050] Figure 3 A schematic flow chart of an implementation method for determining a system frequency in one embodiment;

[0051] Figure 4 is a flow chart of a control method for a cogeneration system in another embodiment;

[0052] Figure 5 A schematic flow chart of a control method for a cogeneration system in another embodiment;

[0053] Figure 6 is a flow chart of a control method for a cogeneration system in another embodiment;

[0054] Figure 7 is a structural block diagram of a control device for a cogeneration system in one embodiment;

[0055] Figure 8 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0057] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0060] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] Research has found that molten salt heat storage systems can utilize curtailed renewable energy to generate electricity, thereby enabling the supply of industrial steam through molten salt heat storage systems. Due to the volatility of curtailed renewable energy, this curtailed electricity may be insufficient. Using only electrically heated molten salt for energy storage may not provide a stable supply of industrial steam. To ensure the continuity and stability of industrial steam supply, fully utilizing the molten salt heat storage system to meet all chemical steam needs requires over-allocation of molten salt electric heaters and molten salt, resulting in increased investment and high system idle costs. To reduce the investment cost of the molten salt heat storage system, it can be coupled with a thermal power unit for joint supply. That is, if the molten salt heat storage system cannot meet steam demand, the thermal power unit can supplement the insufficient steam from the molten salt heat storage system.

[0063] Specifically, the thermal power unit and the molten salt heat storage system are coupled, and the steam output is coordinated to meet the corresponding power grid demand. Generally, the molten salt heat storage system can output steam based on the heat release process of the molten salt. Taking into account the situation of new energy power generation and consumption, the molten salt heat storage system can perform a heat storage process based on the abandonment of new energy, and then output the stored steam during the heat release process. Therefore, by combining the thermal power unit and the molten salt heat storage system, the problem of low grid operation stability caused by the molten salt heat storage system can be solved. At the same time, the molten salt heat storage system can also solve the problem of abandonment of new energy and promote the local consumption of new energy electricity.

[0064] In view of this, the present application provides a cogeneration system, which may include a molten salt heat storage system, a thermal power unit, and a control device. The molten salt heat storage system includes an electrically heated molten salt heat exchanger, a first salt tank, a second salt tank, and a molten salt steam generator; the electrically heated molten salt heat exchanger is connected to a new energy curtailment power collection device, which is used to collect new energy curtailment power so that the molten salt heat storage system can generate electricity; the first end of the second salt tank is connected to the first end of the first salt tank via the electrically heated molten salt heat exchanger, and the second end of the first salt tank is connected to the second end of the second salt tank via the molten salt steam generator.

[0065] In some embodiments, the cogeneration system may further include a first steam turbine. The thermal power unit and molten salt steam generator are connected to the first generator via the first steam turbine. The thermal power unit and molten salt steam generator are also connected to the user equipment. Thus, the molten salt heat storage system heats water through the molten salt steam generator to generate required industrial steam, which is then supplied to steam users located at the user equipment. The steam can also be fed into the first steam turbine to generate electricity and supply power to the grid, achieving energy storage and peak shaving. Simultaneously, the thermal power unit can also supply steam to steam users located at the user equipment, or it can be fed into the first steam turbine to generate electricity and supply power to the grid, achieving energy storage and peak shaving.

[0066] In some embodiments, the cogeneration system may further include a first feedwater pump, which is used to deliver desalted water to the molten salt steam generating device. The molten salt steam generating device may include a preheater, an evaporator, and a superheater connected in sequence. Specifically, the first feedwater pump is used to deliver desalted water to the preheater. Thus, the low-temperature molten salt in the first salt tank enters the electrically heated molten salt heat exchanger, and the low-temperature molten salt is heated by electrical energy to become high-temperature molten salt and stored in the second salt tank, thereby realizing the heat storage process of the molten salt heat storage system; alternatively, the high-temperature molten salt in the second salt tank is sequentially fed into the heat source side of the superheater, evaporator, and preheater, and the desalted water delivered by the first feedwater pump passes through the cold source side of the preheater, evaporator, and superheater in sequence. The feedwater on the cold source side is heated by the high-temperature molten salt on the heat source side, becomes superheated steam, and is then delivered to the first steam turbine or user equipment; the high-temperature molten salt heats the feedwater and becomes low-temperature molten salt and is stored in the first salt tank, thereby realizing the heat release process of the molten salt heat storage system.

[0067] In some embodiments, a thermal power unit may include a second feedwater pump, a boiler, and a second steam turbine. The second feedwater pump is configured to deliver desalted water to the boiler, allowing the boiler to absorb the heat energy released by fuel combustion and convert it into high-temperature, high-pressure steam. This high-temperature, high-pressure steam then enters the second steam turbine to drive a second generator for power generation. In some cases, the high-temperature, high-pressure steam can also enter user equipment to supply steam to users.

[0068] Combining the above content, such as Figure 1, a schematic structural diagram of a cogeneration system is provided. The cogeneration system 10 may include a molten salt heat storage system, a thermal power unit and control equipment (not shown), and a first steam turbine 102. The molten salt heat storage system includes an electrically heated molten salt heat exchanger 1041, a first salt tank 1042, a second salt tank 1043, a superheater 1044, an evaporator 1045, a preheater 1046, and a first feedwater pump 1047. The thermal power unit includes a second feedwater pump 1061, a boiler 1062, and a second steam turbine 1063.

[0069] exist Figure 1 In the example, electrically heated molten salt heat exchanger 1041 is connected to a waste electricity collection device 20 for collecting waste electricity from renewable energy sources. The first end of a first salt tank 1042 is connected to a first end of a second salt tank 1043 via a superheater 1044, an evaporator 1045, and a preheater 1046. Preheater 1046 is also connected to a first feedwater pump 1047. The second end of second salt tank 1043 is connected to a second end of first salt tank 1042 via electrically heated molten salt heat exchanger 1041. Thus, the low-temperature molten salt in the first salt tank enters the electrically heated molten salt heat exchanger, and the low-temperature molten salt is heated by electric energy to become high-temperature molten salt, which is then stored in the second salt tank, realizing the heat storage process of the molten salt heat storage system; or, the high-temperature molten salt in the second salt tank is sequentially fed into the heat source side of the superheater, evaporator and preheater, and the desalted water delivered by the first feed water pump passes through the cold source side of the preheater, evaporator and superheater in turn, and the feed water on the cold source side is heated by the high-temperature molten salt on the heat source side, becomes superheated steam, and is then delivered to the first steam turbine or user equipment; the high-temperature molten salt heats the feed water to become low-temperature molten salt, which is stored in the first salt tank, realizing the heat release process of the molten salt heat storage system.

[0070] In some embodiments, the electrically heated molten salt heat exchanger is replaced with other electric heat conversion equipment such as a carbon dioxide heat pump, and the molten salt heat storage system can also be changed to other heat storage equipment such as solid heat storage.

[0071] exist Figure 1 In the embodiment, the second steam turbine 1063 is also connected to the second generator 40 for driving the second generator to generate electricity.

[0072] exist Figure 1In the example, superheater 1044 is connected to first generator 30 via first steam turbine 102, and boiler 1062 is also connected to user equipment via second steam turbine 1063. Thus, the molten salt thermal storage system heats water to generate the required industrial steam, which is then supplied to steam users corresponding to the user equipment. This steam can also be fed into the first steam turbine for power generation and supply to the grid, achieving energy storage and peak-shaving. Simultaneously, the thermal power unit can also supply steam to users and feed into the first steam turbine for power generation and supply to the grid, achieving energy storage and peak-shaving. Through coordinated control of the thermal power unit and the molten salt thermal storage system, a corresponding amount of steam can be output to the first steam turbine to meet the grid's steam supply needs.

[0073] In one embodiment, Figure 2 As shown, a control method for a cogeneration system is provided, which is described by taking the application of the method to a control device in the cogeneration system as an example, and includes the following steps:

[0074] S202 , during the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system.

[0075] Among them, system parameters refer to the operating parameters of the molten salt heat storage system during the steam supply process. System parameters include but are not limited to: molten salt heat storage capacity, molten salt temperature, molten salt flow rate, steam pressure, steam temperature and steam flow rate of the steam supply pipeline, as well as steam supply time.

[0076] In some embodiments, different types of sensors may be deployed in the molten salt thermal storage system, so that corresponding system parameters can be collected based on the different types of sensors.

[0077] S204 , when it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, controlling the molten salt heat storage system to supply steam at the system rate, and controlling the thermal power unit to supply steam at the first rate.

[0078] In this embodiment, there is no limitation on the implementation method of determining whether the molten salt heat storage system meets the steam supply lower limit condition based on the system parameters. Several implementation methods are described below with examples.

[0079] In the first implementation method, the system parameters include the first molten salt heat storage capacity, and the first threshold value can be determined based on the renewable energy power generation operating condition corresponding to the molten salt heat storage system; when the first molten salt heat storage capacity is less than or equal to the first threshold value, it is determined that the molten salt heat storage system meets the steam supply lower limit condition.

[0080] Exemplarily, based on the mapping relationship between the renewable energy power generation operating condition and the preset threshold value, the preset threshold value that matches the renewable energy power generation operating condition corresponding to the molten salt thermal storage system can be determined as the first threshold value.

[0081] Among them, the electrically heated molten salt heat exchanger in the molten salt heat storage system is connected to the new energy abandoned power collection equipment, that is, the power generation of the molten salt heat storage system comes from the new energy abandoned power, and the new energy includes wind power and / or photovoltaics. Then the new energy power generation operating conditions corresponding to the molten salt heat storage system can represent the power generation conditions corresponding to wind power and / or photovoltaics.

[0082] In some cases, renewable energy power generation conditions can include wind power and / or photovoltaic power generation conditions with high power generation and low power generation, based on power generation capacity. In other cases, renewable energy power generation conditions can include wind power and / or photovoltaic power generation conditions with stable power generation and fluctuating power generation, based on power generation status. High power generation conditions represent the state where maximum power output is achieved under optimal conditions.

[0083] In a second implementation, the system parameters may include a first steam supply duration. When the first steam supply duration reaches a first preset duration, it is determined that the molten salt thermal storage system meets the steam supply lower limit condition.

[0084] Among them, the system rate is less than the rate of the molten salt heat storage system before steam is supplied at the system rate. That is, when the molten salt heat storage system meets the lower limit of steam supply, it means that the molten salt heat storage system has reached the lower limit of the amount of steam it can release. Therefore, by reducing the steam supply rate of the molten salt heat storage system, the heat release flow of the molten salt heat storage system can be slowly reduced. By controlling the steam supply of the thermal power unit at the first rate, the steam supply volume of the thermal power unit can be synchronously increased, ensuring a smooth transition of pressure and flow in the steam pipeline of the molten salt heat storage system, avoiding problems such as excessive pressure fluctuations and steam supply interruptions, and improving the stability and safety of steam supply.

[0085] In this embodiment, the method for determining the system rate is not limited. For example, the preset steam supply rate corresponding to the molten salt thermal storage system can be determined as the system rate; or the system rate can be determined as the product of the current steam supply rate of the molten salt thermal storage system and the adjustment coefficient corresponding to the molten salt thermal storage system.

[0086] In some embodiments, during the steam supply process of the molten salt heat storage system and the thermal power unit, a first operating parameter of the molten salt heat storage system and a second operating parameter of the thermal power unit are monitored in real time; when the first operating parameter and / or the second operating parameter are abnormal, an early warning message is output, and corresponding protection measures of the molten salt heat storage system and the thermal power unit are executed to improve the safety and stability of the system during operation.

[0087] In some cases, the first operating parameter may include the molten salt temperature. When the molten salt temperature is greater than or equal to the upper temperature limit, or the lava temperature is less than the lower temperature limit, it is determined that the first operating parameter is abnormal. The corresponding protection measures may include adjusting the electric heating power of the molten salt heat storage system or stopping the steam supply, etc.

[0088] In some cases, the second operating parameter may include the air intake of the second steam turbine. When the air intake of the second steam turbine is less than the air intake threshold, it is determined that the second operating parameter is abnormal, and the corresponding protection measures may include adjusting the second operating parameter or stopping steam supply.

[0089] In step S206, when the molten salt thermal storage system supplies steam at the system rate, if the molten salt thermal storage system meets the steam supply upper limit condition, the molten salt thermal storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt thermal storage system matches the steam supply demand of the cogeneration system.

[0090] The steam demand of the cogeneration system refers to the amount of steam that the cogeneration system should export to the power grid. The steam supply limit condition refers to the condition under which the molten salt thermal storage system stops supplying steam. There are various ways to ensure that the molten salt thermal storage system meets the steam supply limit condition. The following examples illustrate several implementation methods.

[0091] In a first implementation, when the molten salt thermal storage system supplies steam at a system rate, a second steam supply duration of the molten salt thermal storage system is obtained. When the second steam supply duration reaches a second preset duration, it is determined that the molten salt thermal storage system meets the steam supply upper limit condition. The second steam supply duration includes the first steam supply duration, and the second preset duration is greater than the first preset duration.

[0092] In a second implementation, when the molten salt thermal storage system supplies steam at the system rate, a second molten salt thermal storage capacity of the molten salt thermal storage system is obtained. When the second molten salt thermal storage capacity is less than or equal to a second threshold, the molten salt thermal storage system is determined to have met the steam supply upper limit condition. The second threshold is less than the first threshold. For example, the first threshold may be 20% of the rated thermal storage capacity, and the second threshold may be 10% of the rated thermal storage capacity. Other values ​​may also be set.

[0093] Among them, the second rate is greater than the first rate. When the molten salt heat storage system stops supplying steam, the thermal power unit fully assumes the steam supply task. By increasing the steam supply rate of the thermal power unit, the thermal power unit is in an efficient operating state under the current steam supply load, which can quickly meet the steam supply demand of the power grid.

[0094] In some embodiments, when the molten salt thermal storage system stops supplying steam, the total steam supply of the molten salt thermal storage system is obtained; the difference between the steam demand of the cogeneration system and the total steam supply of the molten salt thermal storage system is determined as the steam supply required by the thermal power unit. Based on the steam supply required by the thermal power unit, the operating parameters of the thermal power unit are adjusted to ensure that the total steam supply of the thermal power unit matches the steam supply required by the thermal power unit. The operating parameters of the thermal power unit may include, but are not limited to, parameters such as the fuel supply and the air intake of the second steam turbine.

[0095] based on Figure 2The content shown is that during the steam supply process of the molten salt heat storage system, the system parameters of the molten salt heat storage system are obtained. When it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, the molten salt heat storage system is controlled to supply steam at the system rate, and the thermal power unit is controlled to supply steam at a first rate. Wherein, the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate, and when the molten salt heat storage system is supplying steam at the system rate, if the molten salt heat storage system meets the steam supply upper limit condition, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system match the steam supply demand of the cogeneration system. Thus, by combining the thermal power unit and the molten salt heat storage system to jointly share the steam supply task of the power grid, the problem of low power grid operation stability caused by the molten salt heat storage system performing the steam supply task alone can be solved, and the steam supply stability of the power grid can be improved.

[0096] In one embodiment, Figure 3 As shown, an implementation method for determining the system frequency is provided, and an example of applying the method to a control device in a cogeneration system is used for illustration, including the following steps:

[0097] S302 , obtaining historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each historical steam supply month.

[0098] The steam supply months of the molten salt thermal storage system refer to the months in which the molten salt thermal storage system outputs steam. It should be understood that the steam supply rates of the molten salt thermal storage system may be the same or different in different historical steam supply months. In the same historical steam supply month, at least one adjustment may be made to the steam supply rate of the molten salt thermal storage system. Thus, each historical steam supply month corresponds to at least one historical steam supply rate.

[0099] S304: Determine the system rate based on the historical steam supply rates corresponding to the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

[0100] Exemplarily, from each historical steam supply month, the historical steam supply month that is consistent with the current steam supply month of the molten salt thermal storage system is determined as the target steam supply month; and the system rate is determined based on each historical steam supply rate corresponding to the target steam supply month.

[0101] In some cases, when the number of target steam supply months is one, the average of the historical steam supply rates corresponding to the target steam supply months can be determined as the system rate; or, the minimum historical steam supply rate among the historical steam supply rates corresponding to the target steam supply months can be determined as the system rate; or, the maximum historical steam supply rate among the historical steam supply rates corresponding to the target steam supply months can be determined as the system rate.

[0102] In some cases, when there are multiple target steam supply months, the target steam supply month adjacent to the current steam supply month of the molten salt thermal storage system is determined as the first candidate steam supply month from the multiple target steam supply months; and the system rate is determined based on the historical steam supply rates corresponding to the first candidate steam supply month.

[0103] In some cases, when there are multiple target steam supply months, a randomly selected target steam supply month is determined as the second candidate steam supply month; and the system rate is determined based on the historical steam supply rates corresponding to the second candidate steam supply month.

[0104] based on Figure 3 The content shown can improve analysis efficiency and further improve control efficiency of the cogeneration system by combining historical control data of the cogeneration system to determine the system rate.

[0105] In one embodiment, after the molten salt thermal storage system is controlled to stop supplying steam, Figure 4 As shown, a flow chart of a control method for a cogeneration system is provided. The method is described by taking the application of the method to a control device in a cogeneration system as an example, and includes the following steps:

[0106] S402, obtaining the current heat storage capacity and current molten salt temperature of the molten salt heat storage system.

[0107] S404: Based on the current molten salt temperature, adjust the electric heating power of the molten salt heat storage system so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range.

[0108] Among them, by adjusting the electric heating power of the molten salt heat storage system, the molten salt temperature of the molten salt heat storage system is within a preset temperature range, thereby avoiding energy waste and equipment loss caused by excessive heating, saving energy and reducing the use cost of the molten salt heat storage system.

[0109] In some cases, the molten salt can be solar salt, which is 40% KNO3 (potassium nitrate) and 60% NaNO3 (sodium nitrate), and the preset temperature range can be 290℃~550℃, and other settings are also possible.

[0110] S406, controlling the molten salt heat storage system to operate at the adjusted electric heating power, and returning to the step of obtaining the current heat storage amount of the molten salt heat storage system until the new current heat storage amount reaches the upper limit of the heat storage amount.

[0111] based on Figure 4As shown in the content, after the molten salt heat storage system is controlled to stop supplying steam, the molten salt heat storage system can be controlled to perform a heat storage process until the heat storage amount of the molten salt heat storage system reaches the upper limit of the heat storage amount, and then the electric heating is stopped. Thus, while avoiding overheating of the molten salt heat storage system, by controlling the molten salt heat storage system to perform the heat storage process, the molten salt heat storage system can enter the next steam supply process in time, thereby improving the steam supply efficiency.

[0112] In one embodiment, Figure 5 As shown, a flow chart of a control method for a cogeneration system is provided. The method is described by taking the application of the method to a control device in a cogeneration system as an example, and includes the following steps:

[0113] S502 , when the thermal power generation unit supplies steam at a second rate, obtaining the power generation of each thermal power generation unit within each preset time period.

[0114] S504, when the power generation of each unit shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, the thermal power unit is controlled to stop supplying steam, and the molten salt heat storage system is controlled to resume supplying steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply.

[0115] The remaining steam supply is the difference between the total steam supply of the thermal power unit and the unit's current steam supply. If power generation capacity is declining, this indicates that the thermal power unit may not be able to meet its required steam supply. Therefore, steam supply to the thermal power unit is controlled to be stopped. By controlling the molten salt thermal storage system to resume steam supply, the molten salt thermal storage system can replenish the remaining steam supply, which is the remaining steam supply.

[0116] In some embodiments, when the remaining steam supply is greater than or equal to a first steam supply threshold, the flow rate of molten salt in the molten salt thermal storage system is increased to increase the heat release rate. When the remaining steam supply is less than or equal to a second steam supply threshold, the flow rate of molten salt in the molten salt thermal storage system is decreased to reduce the heat release rate. The first steam supply threshold is greater than or equal to the second steam supply threshold, and the first and second steam supply thresholds can be the same or different.

[0117] In some cases, when adjusting the flow rate of molten salt in the molten salt heat storage system, the valve opening on the steam pipe of the molten salt heat storage system can be adjusted synchronously to maintain the stability of the steam parameters of the steam pipe and meet the user's requirements for steam parameters. The steam parameters may include but are not limited to steam pressure and temperature.

[0118] In some embodiments, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt thermal storage system does not match the steam supply demand, the current molten salt thermal storage capacity of the molten salt thermal storage system during the thermal storage process is obtained; if the current molten salt thermal storage capacity is greater than or equal to a preset thermal storage capacity, the molten salt thermal storage system is controlled to stop the thermal storage process and resume steam supply. The preset thermal storage capacity can refer to a lower thermal storage capacity limit, a first threshold value, or other values. For example, the lower thermal storage capacity limit can be 50% of the rated thermal storage capacity, or other values.

[0119] In some embodiments, if the current molten salt heat storage capacity is less than the lower limit of the heat storage capacity, a prompt message is output for the thermal power unit, which is used to instruct the thermal power unit to increase the fuel supply so that the thermal power unit can continue to supply steam after the fuel supply is increased.

[0120] based on Figure 5 The content shown is that by real-time monitoring of the power generation of the thermal power units, when the power supply of the thermal power units is insufficient, the thermal power units are controlled to stop supplying steam and the molten salt heat storage system is controlled to resume supplying steam, thereby ensuring stable output steam supply and improving the stability of power grid operation.

[0121] In combination with the above, in one embodiment, Figure 6 As shown, a flow chart of a control method for a cogeneration system is provided. The method is described by taking the application of the method to a control device in a cogeneration system as an example, and includes the following steps:

[0122] S602 , during a steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system; the system parameters include a first molten salt heat storage capacity.

[0123] S604: When the first molten salt heat storage amount is less than or equal to the first threshold, it is determined that the molten salt heat storage system meets the steam supply lower limit condition, and the molten salt heat storage system is controlled to supply steam at the system rate, and the thermal power unit is controlled to supply steam at the first rate.

[0124] The first threshold is determined based on a renewable energy power generation operating condition corresponding to the molten salt thermal storage system. The system rate is less than a rate before the molten salt thermal storage system supplies steam at the system rate.

[0125] S606 , when the molten salt heat storage system supplies steam at a system rate, obtaining a second molten salt heat storage capacity of the molten salt heat storage system.

[0126] S608: When the second molten salt heat storage amount is less than or equal to the second threshold, it is determined that the molten salt heat storage system meets the steam supply upper limit condition, and the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system.

[0127] The second rate is greater than the first rate.

[0128] The specific contents of S602-S608 can be referred to the content adaptation description and will not be repeated here.

[0129] In combination with the above content, it can be seen that the cogeneration system provided by this application can absorb the abandoned electricity of new energy sources through the electrically heated molten salt heat exchanger and heat the low-temperature molten salt to high-temperature molten salt. At the same time, the molten salt heat storage system heats water through the molten salt steam generation equipment to generate industrial steam with the required parameters for supply to steam users. It can also enter the first steam turbine to generate electricity and supply power to the power grid, realizing the energy storage peak regulation effect. That is, the molten salt heat storage system in the cogeneration system can realize the absorption of abandoned electricity of new energy sources and the provision of industrial steam.

[0130] Due to the volatility of renewable energy curtailment and the resulting shortage of renewable energy under extreme conditions, a stable supply of industrial steam cannot be achieved solely through electrically heated molten salt energy storage. To ensure stable industrial steam supply, a combined supply system with thermal power units is used. This system uses steam from thermal power units to compensate for the shortfall in renewable energy generation and heating. The steam flow from the thermal power units is then adjusted based on the steam flow from the molten salt heat storage system to ensure a constant total steam flow.

[0131] In summary, this application utilizes a molten salt heat storage system to achieve curtailed power generation and combined heat and power. Coupled with thermal power units, this system provides a stable steam supply, promoting local consumption of renewable energy power and increasing its consumption rate. The molten salt heat storage system can absorb curtailed renewable energy power and also supply power to the grid through steam turbine generators, meeting the grid's peak load regulation requirements.

[0132] Moreover, the method provided in this application can give full play to the advantages of the molten salt heat storage system, give priority to using its stored heat to meet the steam supply demand, and promptly supplement it with thermal power units when the molten salt heat storage is insufficient, which not only reduces the investment cost of the molten salt heat storage system, but also ensures the stability and reliability of continuous steam supply.

[0133] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0134] Based on the same inventive concept, embodiments of the present application also provide a control device for a cogeneration system for implementing the aforementioned control method for a cogeneration system. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more of the following embodiments of the control device for a cogeneration system can be found in the aforementioned limitations of the control method for a cogeneration system, and will not be further elaborated here.

[0135] In one embodiment, Figure 7 As shown, a control device for a cogeneration system is provided, comprising: an acquisition module 702, a first control module 704, and a second control module 706. The acquisition module 702 is configured to acquire system parameters of the molten salt heat storage system during the steam supply process of the molten salt heat storage system.

[0136] The first control module 704 is configured to control the molten salt heat storage system to supply steam at a system rate and control the thermal power unit to supply steam at a first rate when it is determined based on the system parameters that the molten salt heat storage system meets a lower steam supply limit condition; wherein the system rate is less than a rate of the molten salt heat storage system before supplying steam at the system rate.

[0137] The second control module 706 is configured to control the molten salt heat storage system to stop supplying steam and control the thermal power unit to supply steam at a second rate when the molten salt heat storage system supplies steam at the system rate, if the molten salt heat storage system meets the steam supply upper limit condition, until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

[0138] In one embodiment, the system parameters include a first molten salt heat storage capacity; the first control module 704 is further used to: determine a first threshold value based on the renewable energy power generation operating condition corresponding to the molten salt heat storage system; when the first molten salt heat storage capacity is less than or equal to the first threshold value, determine that the molten salt heat storage system meets the steam supply lower limit condition.

[0139] In one embodiment, the second control module 706 is further used to: obtain a second molten salt heat storage capacity of the molten salt heat storage system when the molten salt heat storage system supplies steam at a system rate; and determine that the molten salt heat storage system meets the steam supply upper limit condition when the second molten salt heat storage capacity is less than or equal to a second threshold.

[0140] In one embodiment, the first control module 704 is further used to: obtain historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each of the historical steam supply months; determine the system rate based on each historical steam supply rate corresponding to each of the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

[0141] In one embodiment, after controlling the molten salt heat storage system to stop supplying steam, the second control module 706 is further used to: obtain the current heat storage amount and the current molten salt temperature of the molten salt heat storage system; adjust the electric heating power of the molten salt heat storage system based on the current molten salt temperature so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range; control the molten salt heat storage system to operate with the adjusted electric heating power, and return to the step of obtaining the current heat storage amount of the molten salt heat storage system until the new current heat storage amount reaches the upper limit of the heat storage amount.

[0142] In one embodiment, the second control module 706 is further used to: when the thermal power unit supplies steam at a second rate, obtain the power generation of each thermal power unit within each preset time period; when each power generation shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, control the thermal power unit to stop supplying steam, and control the molten salt heat storage system to re-supply steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply; wherein the remaining steam supply is the difference between the total steam supply of the thermal power unit and the current steam supply of the thermal power unit.

[0143] Each module in the control device for the cogeneration system described above may be implemented in whole or in part through software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0144] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 8As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store data such as system parameters. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a control method for a cogeneration system is implemented.

[0145] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0146] In an exemplary embodiment, a computer device is provided, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the following steps when executing the computer program: during the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system; when it is determined based on the system parameters that the molten salt heat storage system meets a lower limit condition for steam supply, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate; when the molten salt heat storage system supplies steam at the system rate until an upper limit condition for steam supply is met, controlling the molten salt heat storage system to stop supplying steam, and controlling the thermal power unit to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; and the second rate is greater than the first rate.

[0147] In one embodiment, the system parameters include a first molten salt heat storage capacity; when the processor executes the computer program, the following steps are further implemented: determining a first threshold value based on the renewable energy power generation operating condition corresponding to the molten salt heat storage system; when the first molten salt heat storage capacity is less than or equal to the first threshold value, determining that the molten salt heat storage system meets the steam supply lower limit condition.

[0148] In one embodiment, when the processor executes the computer program, it further implements the following steps: when the molten salt heat storage system supplies steam at a system rate, obtaining a second molten salt heat storage capacity of the molten salt heat storage system; when the second molten salt heat storage capacity is less than or equal to a second threshold, determining that the molten salt heat storage system meets the steam supply upper limit condition.

[0149] In one embodiment, when the processor executes the computer program, it further implements the following steps: obtaining historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each of the historical steam supply months; determining the system rate based on each historical steam supply rate corresponding to each of the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

[0150] In one embodiment, after the molten salt heat storage system is controlled to stop supplying steam, the processor further implements the following steps when executing the computer program: obtaining the current heat storage amount and the current molten salt temperature of the molten salt heat storage system; adjusting the electric heating power of the molten salt heat storage system based on the current molten salt temperature so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range; controlling the molten salt heat storage system to operate with the adjusted electric heating power, and returning to the step of obtaining the current heat storage amount of the molten salt heat storage system until the new current heat storage amount reaches the upper limit of the heat storage amount.

[0151] In one embodiment, when the processor executes the computer program, the following steps are further implemented: when the thermal power unit supplies steam at a second rate, the power generation of each thermal power unit within each preset time period is obtained; when each power generation shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, the thermal power unit is controlled to stop supplying steam, and the molten salt heat storage system is controlled to re-supply steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply; wherein the remaining steam supply is the difference between the total steam supply of the thermal power unit and the current steam supply of the thermal power unit.

[0152] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: during the steam supply process of the molten salt heat storage system, system parameters of the molten salt heat storage system are obtained; when it is determined based on the system parameters that the molten salt heat storage system meets a lower limit condition for steam supply, the molten salt heat storage system is controlled to supply steam at a system rate, and the thermal power unit is controlled to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate; when the molten salt heat storage system supplies steam at the system rate until an upper limit condition for steam supply is met, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

[0153] In one embodiment, the system parameters include a first molten salt heat storage capacity; when the computer program is executed by the processor, the following steps are also implemented: determining a first threshold value based on the renewable energy power generation operating condition corresponding to the molten salt heat storage system; when the first molten salt heat storage capacity is less than or equal to the first threshold value, determining that the molten salt heat storage system meets the steam supply lower limit condition.

[0154] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the molten salt heat storage system supplies steam at a system rate, obtaining a second molten salt heat storage capacity of the molten salt heat storage system; when the second molten salt heat storage capacity is less than or equal to a second threshold, determining that the molten salt heat storage system meets the steam supply upper limit condition.

[0155] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: obtaining historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each of the historical steam supply months; determining the system rate based on each historical steam supply rate corresponding to each of the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

[0156] In one embodiment, after the molten salt heat storage system is controlled to stop supplying steam, the computer program further implements the following steps when executed by the processor: obtaining the current heat storage amount and the current molten salt temperature of the molten salt heat storage system; adjusting the electric heating power of the molten salt heat storage system based on the current molten salt temperature so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range; controlling the molten salt heat storage system to operate with the adjusted electric heating power, and returning to the step of obtaining the current heat storage amount of the molten salt heat storage system until the new current heat storage amount reaches the upper limit of the heat storage amount.

[0157] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the thermal power unit supplies steam at a second rate, the power generation of each thermal power unit within each preset time period is obtained; when each power generation shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, the thermal power unit is controlled to stop supplying steam, and the molten salt heat storage system is controlled to re-supply steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply; wherein the remaining steam supply is the difference between the total steam supply of the thermal power unit and the current steam supply of the thermal power unit.

[0158] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps: obtaining system parameters of the molten salt heat storage system during steam supply by the molten salt heat storage system; when it is determined, based on the system parameters, that the molten salt heat storage system satisfies a lower limit condition for steam supply, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate; when the molten salt heat storage system supplies steam at the system rate until an upper limit condition for steam supply is satisfied, controlling the molten salt heat storage system to stop supplying steam, and controlling the thermal power unit to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; and the second rate is greater than the first rate.

[0159] In one embodiment, the system parameters include a first molten salt heat storage capacity; when the computer program is executed by the processor, the following steps are also implemented: determining a first threshold value based on the renewable energy power generation operating condition corresponding to the molten salt heat storage system; when the first molten salt heat storage capacity is less than or equal to the first threshold value, determining that the molten salt heat storage system meets the steam supply lower limit condition.

[0160] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the molten salt heat storage system supplies steam at a system rate, obtaining a second molten salt heat storage capacity of the molten salt heat storage system; when the second molten salt heat storage capacity is less than or equal to a second threshold, determining that the molten salt heat storage system meets the steam supply upper limit condition.

[0161] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: obtaining historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each of the historical steam supply months; determining the system rate based on each historical steam supply rate corresponding to each of the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

[0162] In one embodiment, after the molten salt heat storage system is controlled to stop supplying steam, the computer program further implements the following steps when executed by the processor: obtaining the current heat storage amount and the current molten salt temperature of the molten salt heat storage system; adjusting the electric heating power of the molten salt heat storage system based on the current molten salt temperature so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range; controlling the molten salt heat storage system to operate with the adjusted electric heating power, and returning to the step of obtaining the current heat storage amount of the molten salt heat storage system until the new current heat storage amount reaches the upper limit of the heat storage amount.

[0163] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the thermal power unit supplies steam at a second rate, the power generation of each thermal power unit within each preset time period is obtained; when each power generation shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, the thermal power unit is controlled to stop supplying steam, and the molten salt heat storage system is controlled to re-supply steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply; wherein the remaining steam supply is the difference between the total steam supply of the thermal power unit and the current steam supply of the thermal power unit.

[0164] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0165] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0166] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0167] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A control method for a cogeneration system, characterized in that: The cogeneration system includes a molten salt heat storage system and a thermal power unit, and the method includes: During the steam supply process of the molten salt heat storage system, obtaining system parameters of the molten salt heat storage system; When it is determined based on the system parameters that the molten salt heat storage system meets the steam supply lower limit condition, controlling the molten salt heat storage system to supply steam at a system rate, and controlling the thermal power unit to supply steam at a first rate; wherein the system rate is less than the rate of the molten salt heat storage system before supplying steam at the system rate; When the molten salt heat storage system supplies steam at a system rate, if the molten salt heat storage system meets a steam supply upper limit condition, the molten salt heat storage system is controlled to stop supplying steam, and the thermal power unit is controlled to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate is greater than the first rate.

2. The method according to claim 1, characterized in that The system parameters include a first molten salt heat storage capacity; and determining, based on the system parameters, that the molten salt heat storage system meets the steam supply lower limit condition includes: Determining a first threshold value based on a renewable energy power generation operating condition corresponding to the molten salt heat storage system; When the first molten salt heat storage amount is less than or equal to a first threshold, it is determined that the molten salt heat storage system meets the steam supply lower limit condition.

3. The method according to claim 1, characterized in that The method further comprises: When the molten salt heat storage system supplies steam at a system rate, obtaining a second molten salt heat storage amount of the molten salt heat storage system; When the second molten salt heat storage amount is less than or equal to a second threshold, it is determined that the molten salt heat storage system meets the steam supply upper limit condition.

4. The method according to claim 1, wherein The method further comprises: Acquiring historical control data of the cogeneration system, the historical control data including each historical steam supply month of the molten salt thermal storage system and at least one historical steam supply rate of the molten salt thermal storage system in each of the historical steam supply months; The system rate is determined based on the historical steam supply rates corresponding to the historical steam supply months and the current steam supply month of the molten salt thermal storage system.

5. The method according to claim 1, wherein After controlling the molten salt thermal storage system to stop supplying steam, the method further includes: Obtaining the current heat storage capacity and the current molten salt temperature of the molten salt heat storage system; Based on the current molten salt temperature, adjusting the electric heating power of the molten salt heat storage system so that the molten salt temperature of the molten salt heat storage system is within a preset temperature range; The molten salt heat storage system is controlled to operate at the adjusted electric heating power, and the process returns to the step of obtaining the current heat storage capacity of the molten salt heat storage system until the new current heat storage capacity reaches the upper limit of the heat storage capacity.

6. The method according to claim 5, characterized in that The method further comprises: When the thermal power generation unit supplies steam at a second rate, obtaining the power generation of each thermal power generation unit within each preset time period; In the case where the power generation shows a downward trend, if the sum of the current steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system does not match the steam supply demand, the thermal power unit is controlled to stop supplying steam, and the molten salt heat storage system is controlled to resume supplying steam until the steam supply provided by the molten salt heat storage system matches the remaining steam supply; The remaining steam supply is the difference between the total steam supply of the thermal power unit and the current steam supply of the thermal power unit.

7. A control device for a cogeneration system, characterized in that: The cogeneration system includes a molten salt heat storage system and a thermal power unit, and the device includes: An acquisition module, configured to acquire system parameters of the molten salt heat storage system during a steam supply process of the molten salt heat storage system; a first control module, configured to, when it is determined based on the system parameters that the molten salt heat storage system satisfies a lower steam supply limit condition, control the molten salt heat storage system to supply steam at a system rate, and control the thermal power unit to supply steam at a first rate; wherein the system rate is less than a rate of the molten salt heat storage system before supplying steam at the system rate; a second control module, configured to, when the molten salt heat storage system supplies steam at a system rate and, if the molten salt heat storage system meets a steam supply upper limit condition, control the molten salt heat storage system to stop supplying steam and control the thermal power unit to supply steam at a second rate until the sum of the total steam supply of the thermal power unit and the total steam supply of the molten salt heat storage system matches the steam supply demand of the cogeneration system; the second rate being greater than the first rate.

8. A combined heat and power system, characterized in that: The cogeneration system includes a molten salt heat storage system, a thermal power unit and control equipment; The molten salt heat storage system includes an electrically heated molten salt heat exchanger, a first salt tank, a second salt tank and a molten salt steam generating device; the electrically heated molten salt heat exchanger is connected to a new energy abandoned electricity collection device, and the new energy abandoned electricity collection device is used to collect new energy abandoned electricity; the first end of the first salt tank is connected to the first end of the second salt tank through the molten salt steam generating device, and the second end of the second salt tank is connected to the second end of the first salt tank through the electrically heated molten salt heat exchanger; The control device is used to control the molten salt heat storage system and the thermal power unit to implement the steps of any one of claims 1 to 6.

9. The cogeneration system according to claim 8, characterized in that: The system further includes: a first steam turbine; The thermal power generation unit and the molten salt steam generating device are connected to the first generator via the first steam turbine; the thermal power generation unit and the molten salt steam generating device are also connected to user equipment.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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