Energy storage coupling heat pump steam supply control method and system

Abstract

The invention discloses an energy storage coupling heat pump steam supply control method and system.The steam supply system comprises a heat pump device and an energy storage device, a heat exchange medium sequentially passes through the heat pump device and the energy storage device to be heated step by step, and heat storage water with the first temperature and steam with the second temperature and used for being supplied to a user side are sequentially generated; the control method comprises the following steps: acquiring target data, wherein the target data comprises the residual capacitance of a transformer, the required electricity capacity and the steam demand quantity of an application side; generating an energy charging plan according to the residual capacitance of the transformer, the required electricity capacity and the steam demand quantity; and controlling the heat pump device and the energy storage device to charge energy according to the energy charging plan. According to the steam supply method and device, high-quality steam is supplied timely and stably, the steam use requirements of users in different scenes are met, and the user satisfaction degree is improved.

Description

Technical Field

[0001] The present application relates to the fields of heat storage technology and heating control, specifically to a control method and system for steam supply by coupling energy storage with a heat pump, and is particularly applicable to the collaborative operation scenario of an energy storage device and a heat pump device. Background Art

[0002] In industrial and commercial scenarios, steam, as an important energy medium, is widely used for industrial heating, power drive, and hot water supply, etc.

[0003] In the prior art, steam is usually directly generated by heating with a gas boiler or an electric boiler.

[0004] However, these methods have problems such as high energy consumption, high operating cost, low heating efficiency, and insufficient dynamic regulation ability, which do not meet the requirements of modern energy optimization and energy conservation and emission reduction. Summary of the Invention

[0005] The present application aims to solve the problems of low operating efficiency, high operating cost, and insufficient adaptability of the heat pump device and the energy storage module in the prior art, and provides a control method and system for steam supply by coupling energy storage with a heat pump.

[0006] In a first aspect, the present application provides a control method for steam supply by coupling energy storage with a heat pump. The steam supply system includes a heat pump device and an energy storage device. The heat transfer medium sequentially passes through the heat pump device and the energy storage device for step-by-step heating, and successively generates stored hot water with a first temperature and water vapor with a second temperature for supplying to the user side. The control method includes the steps of:

[0007] Obtain target data, where the target data includes the remaining capacitance of the transformer, the required power consumption capacitance, and the steam demand on the application side;

[0008] Generate a charging plan according to the remaining capacitance of the transformer, the required power consumption capacitance, and the steam demand;

[0009] Control the heat pump device and the energy storage device to charge according to the charging plan.

[0010] In some technical solutions, the energy storage device includes at least two energy storage modules. The step of generating a charging plan according to the remaining capacitance of the transformer, the required power consumption capacitance, and the steam demand includes the steps of:

[0011] Obtain the maximum available capacitance of the steam supply system according to the rated capacitance of the transformer and the required power consumption capacitance; the maximum available capacitance of the system is positively correlated with the rated capacitance of the transformer, and the maximum available capacitance of the system is inversely correlated with the required power consumption capacitance;

[0012] Compare the remaining capacitance of the transformer with the maximum available capacitance of the system;

[0013] If the maximum available capacitance of the system exceeds the remaining capacitance of the transformer, generate the charging plan according to the steam demand and the remaining capacitance of the transformer;

[0014] If the maximum available capacitance of the system does not exceed the remaining capacitance of the transformer, generate the charging plan according to the steam demand, the remaining capacitance of the transformer, and the charging states of all the energy storage modules in the energy storage device.

[0015] In some technical solutions, generating the charging plan according to the steam demand and the remaining capacitance of the transformer includes the steps of:

[0016] If the steam demand exceeds the rated steam demand, control the energy storage device and the heat pump device to charge using valley electricity, and then control the energy storage device and the heat pump device to charge using flat electricity so that the steam volume is replenished to the steam demand;

[0017] If the steam demand does not exceed the rated steam demand, control the energy storage device and the heat pump device to charge using valley electricity.

[0018] In some technical solutions, the duration of controlling the heat pump device to charge using flat electricity is lower than a preset duration.

[0019] In some technical solutions, generating the charging plan according to the steam demand, the remaining capacitance of the transformer, and the charging states of all the energy storage modules in the energy storage device includes the steps of:

[0020] If the steam demand exceeds the rated steam demand, select a preset number of the energy storage modules to stop charging according to the charging states, and control the remaining energy storage modules and the heat pump device to charge using valley electricity, and then control the remaining energy storage modules and the heat pump device to charge so that the steam volume is replenished to the steam demand;

[0021] If the steam demand does not exceed the rated steam demand, control the energy storage device and the heat pump device to charge using valley electricity.

[0022] In some technical solutions, the remaining capacitance of the transformer includes the remaining capacitance of valley electricity and the remaining capacitance of flat electricity, and further includes:

[0023] Obtain the maximum capacitance of the steam supply system, and calculate the optimal capacitance according to the remaining capacitance of valley electricity and the remaining capacitance of flat electricity;

[0024] Compare the magnitudes of the steam demand, the optimal capacitance, and the maximum capacitance;

[0025] If the steam demand is lower than the optimal capacitance, control the heat pump device to perform energy storage using valley electricity;

[0026] If the steam demand is higher than the maximum capacitance, prompt that the remaining capacitance of the transformer is insufficient, and control to reduce the energy storage power of the steam supply system;

[0027] If the steam demand is higher than the optimal capacitance and lower than the maximum capacitance, control the heat pump device to perform energy storage using valley electricity and flat electricity according to the valley-to-flat ratio.

[0028] In some technical solutions, the valley-to-flat ratio is the ratio of the energy storage power during the flat electricity period to the energy storage power during the valley electricity period, and the valley-to-flat ratio is negatively correlated with the remaining capacitance of the valley electricity and the steam demand.

[0029] In some technical solutions, it further includes:

[0030] When it is monitored that the remaining capacitance of the transformer is lower than the first remaining capacitance threshold, prompt that the remaining capacitance of the transformer is insufficient;

[0031] When it is monitored that the remaining capacitance of the transformer is lower than the second remaining capacitance threshold, prompt that the remaining capacitance of the transformer is insufficient, and select a preset number of the energy storage modules to stop energy storage according to the energy storage state.

[0032] In some technical solutions, it further includes:

[0033] Obtain historical electricity consumption data and order data, and obtain the required electricity capacitance according to the historical electricity consumption data and the order data.

[0034] In a second aspect, the present application further provides a control system for energy storage-coupled heat pump steam supply, including:

[0035] A heat pump device, an energy storage device, and a controller;

[0036] The heat exchange medium sequentially passes through the heat pump device and the energy storage device for step-by-step heating, and sequentially generates stored hot water with a first temperature and water vapor with a second temperature for supplying to the user side;

[0037] The controller is used to obtain target data, and the target data includes the remaining capacitance of the transformer, the required electricity capacitance, and the steam demand on the application side;

[0038] The controller is used to generate an energy storage plan according to the remaining capacitance of the transformer, the required electricity capacitance, and the steam demand;

[0039] Control the heat pump device and the energy storage device to perform energy charging according to the energy charging plan.

[0040] The control method and system for steam supply by energy storage coupled heat pump of the present invention achieve heat storage during valley power periods and efficient steam supply during heat supply periods through the efficient cooperation of the heat pump device and the energy storage module, and have significant technical advantages and economic effects, as follows:

[0041] 1. Based on the energy charging plan, this application reasonably arranges the operation time of the heat pump device and the energy storage device, accurately controls the energy charging periods of the heat pump device and the energy storage device, can supply high-quality water vapor in a timely and stable manner according to the steam demand and demand time of users, meet the steam demand of users in different scenarios, and improve user satisfaction.

[0042] 2. This application generates an energy charging plan according to the steam demand and the remaining capacity of the transformer, or generates an energy charging plan according to the steam demand, the remaining capacity of the transformer and the energy charging state of the energy storage module, which can ensure the reasonable distribution of electric power resources, not only meet the energy charging demand of the steam supply system, but also not exceed the bearing capacity of the transformer, avoid safety problems caused by power overload, and optimize the energy charging strategy to reduce energy consumption and costs when the power is sufficient, achieving double benefits of safety and economy. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings and their markings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic structural diagram of a control system for steam supply by energy storage coupled heat pump according to an embodiment of the present application;

[0045] Figure 2 It is a schematic flow diagram of a control method for steam supply by energy storage coupled heat pump according to an embodiment of the present application;

[0046] Figure 3 It is a control logic block diagram of a control system for steam supply by energy storage coupled heat pump according to an embodiment of the present application. Detailed Embodiments

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific embodiments of the present invention will be described below with reference to the drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts, and other embodiments can also be obtained.

[0048] To simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean "more than one" situation.

[0049] It should also be further understood that the term "and / or" used in the description of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0052] The core of determining steam by electricity is to determine the range of steam supply capacity according to the power supply situation (especially the surplus power during off-peak electricity periods). Since the transformer capacity of small factories or industrial parks is usually limited, it cannot support the operation of large-scale molten salt energy storage systems. Molten salt energy storage systems require a large amount of electricity to drive their heating and energy storage processes. Especially during the heating-up, heat preservation, and energy storage stages of molten salt, the demand for electricity is relatively large. If the transformer capacity is insufficient to meet the power demand of the molten salt energy storage system during peak hours, it will cause the molten salt energy storage system to malfunction.

[0053] The following will describe a control method and a control system for energy storage-coupled heat pump steam supply in the present application with reference to the accompanying drawings of the specification to solve the above problems.

[0054] Refer to Figure 1 and Figure 2 as shown, Figure 1 is a schematic structural diagram of a control system for energy storage-coupled heat pump steam supply provided by an embodiment of the present application, Figure 2 is a schematic flow diagram of a control method for energy storage-coupled heat pump steam supply provided by an embodiment of the present application, Figure 3It is a control logic block diagram of a control system for an energy storage-coupled heat pump steam supply provided by an embodiment of the present application. It should be noted that although the logical sequence is shown in the flowchart shown in Figure 2 or other attached drawings, in some cases, the steps shown or described can be executed in an order different from that shown in the figure. As Figure 1 shown, the control system for an energy storage-coupled heat pump steam supply includes a heat pump device 10 and an energy storage device 20. The heat transfer medium sequentially passes through the heat pump device 10 and the energy storage device 20 for step-by-step heating, and successively generates stored hot water with a first temperature T1 and water vapor with a second temperature T2 for supplying to the user side. As Figure 2 shown, the control method for an energy storage-coupled heat pump steam supply includes the following steps:

[0055] S100. Obtain target data, where the target data includes the remaining capacitance of the transformer, the required power consumption capacity, and the steam demand on the application side.

[0056] As Figure 3 shown, the control logic block diagram includes a data acquisition layer, an intelligent decision-making layer, and an execution control layer. Among them, the data acquisition layer obtains the target data. The remaining capacitance of the transformer refers to the electrical energy capacity that the transformer can additionally provide under the current operating state, which reflects the remaining available power resources of the transformer. By installing monitoring devices on the transformer, such as watt-hour meters, power meters, etc., the operating parameters of the transformer, such as voltage, current, power, etc., are monitored in real time, so as to calculate the remaining capacitance. The required power consumption capacity refers to the total amount of electrical energy required by users within a specific time period, which reflects the degree of demand for electrical energy. The steam demand includes the steam supply amount required by users on the application side and the required steam temperature. Among them, the steam demand is positively correlated with both the steam supply amount and the required steam temperature. The greater the steam supply amount, the greater the steam demand, and the greater the required steam temperature, the greater the steam demand. The steam demand varies according to specific application scenarios (such as industrial production, commercial heating, etc.) and may fluctuate in different time periods or seasons. Through the detailed data of the steam supply amount and the required steam temperature, it can provide a basis for the configuration of the entire heating system. This data input is the basis for all parameter configurations and adjustments in the subsequent steps.

[0057] S200. Generate a charging plan according to the remaining capacitance of the transformer, the required power consumption capacity, and the steam demand.

[0058] S300. Control the heat pump device 10 and the energy storage device 20 to charge according to the charging plan.

[0059] Specifically, the charging plan includes the charging times of the heat pump device 10 and the energy storage device 20, and key data such as the remaining capacitance of the transformer, the required electricity consumption, and the steam demand on the application side are obtained in real time. These data reflect the current power supply capacity of the power grid, the electricity consumption demand of users, and the specific demand for steam. Based on the obtained data, the system generates a charging plan through an intelligent algorithm. According to the charging plan, the system automatically controls the operation of the heat pump device 10 and the energy storage device 20. This plan comprehensively considers the power supply margin of the power grid, the steam demand of users, and the current state of the energy storage device 20 to determine when and how to charge the heat pump device 10 and the energy storage device 20, so as to ensure that the system can achieve the optimal allocation of energy while meeting the needs of users. Based on the charging plan, this application reasonably arranges the operation time of the heat pump device 10 and the energy storage device 20, makes full use of the low-valley electric energy and the remaining capacitance of the transformer, reduces energy waste, and improves the comprehensive utilization rate of energy. According to the real-time load situation of the power grid and the remaining capacitance of the transformer, this application flexibly adjusts the operation states of the heat pump device 10 and the energy storage device 20 to achieve peak shaving and valley filling, relieve the operation pressure of the power grid, and improve the flexibility and stability of the power grid. Based on the charging plan, this application reasonably arranges the operation time of the heat pump device 10 and the energy storage device 20, accurately controls the charging periods of the heat pump device 10 and the energy storage device 20, can supply high-quality water vapor in a timely and stable manner according to the steam demand and demand time of users, meet the steam demand of users in different scenarios, and improve user satisfaction.

[0060] To solve the problem that small factories or industrial parks cannot build molten salt heat storage systems due to insufficient transformer capacity, the "electricity-determined gas" strategy is formulated. In this application, it is set that the energy storage device 20 includes at least two energy storage modules. The method for generating a charging plan according to the remaining capacitance of the transformer, the required electricity consumption, and the steam demand includes the following steps:

[0061] S210. Obtain the maximum available electricity capacity of the steam supply system according to the rated capacitance of the transformer and the required electricity consumption; the maximum available electricity capacity of the system is positively correlated with the rated capacitance of the transformer and negatively correlated with the required electricity consumption;

[0062] S220. Compare the remaining capacitance of the transformer with the maximum available electricity capacity of the system;

[0063] S230. If the maximum available electricity capacity of the system exceeds the remaining capacitance of the transformer, generate the charging plan according to the steam demand and the remaining capacitance of the transformer;

[0064] S240. If the maximum available capacitance of the system does not exceed the remaining capacitance of the transformer, generate the charging plan according to the steam demand, the remaining capacitance of the transformer, and the charging states of all the energy storage modules in the energy storage device 20.

[0065] Specifically, subtract the required power consumption capacitance from the rated capacitance of the transformer to obtain the maximum available capacitance of the steam supply system. The maximum available capacitance of the system is positively correlated with the rated capacitance of the transformer, and the maximum available capacitance of the system is inversely correlated with the required power consumption capacitance. The maximum available capacitance of the system is proportional to the rated capacitance of the transformer and inversely proportional to the required power consumption capacitance. That is to say, the larger the rated capacitance of the transformer, the larger the maximum available capacitance of the system; the larger the required power consumption capacitance, the smaller the maximum available capacitance of the system. Compare the remaining capacitance of the transformer monitored in real time with the previously calculated maximum available capacitance of the system to determine whether the current power supply is sufficient to support the charging operation of the system. If the maximum available capacitance of the system exceeds the remaining capacitance of the transformer, it indicates that the current power supply may not be sufficient to support all the charging requirements. At this time, generate the charging plan according to the steam demand and the remaining capacitance of the transformer to ensure that the most important steam demand is preferentially met under limited power resources. If the maximum available capacitance of the system does not exceed the remaining capacitance of the transformer, it indicates that the current power supply is relatively sufficient. At this time, in addition to considering the steam demand and the remaining capacitance of the transformer, it is also necessary to combine the current charging states of the individual energy storage modules in the energy storage device 20 to generate a more detailed and optimized charging plan to make full use of the available power while considering the charging efficiency and demand of the energy storage modules.

[0066] This application generates the charging plan based on the steam demand and the remaining capacity of the transformer, or generates the charging plan based on the steam demand, the remaining capacity of the transformer, and the charging state of the energy storage module, which can ensure the reasonable allocation of power resources, meet the charging needs of the steam supply system without exceeding the carrying capacity of the transformer, and avoid safety problems caused by power overload. According to different power supply situations (whether the remaining capacity is sufficient), this application adopts different strategies for generating the charging plan, enabling the system to flexibly adapt to changing steam demands and power conditions, and improving the adaptability and reliability of the system. When the power is sufficient, this application comprehensively considers the charging state of the energy storage module, can arrange the charging tasks more optimally, improve the utilization efficiency of the energy storage device 20, extend its service life, and also helps to balance the grid load and reduce the operating cost. Through a reasonable charging plan, the stable operation of the steam supply system is ensured, avoiding steam interruption or insufficiency caused by power shortage, guaranteeing the normal steam demand of the user side, and enhancing the user experience and service quality. When the power is tight, this application controls the heat pump device 10 and the energy storage device 20 to charge according to the charging plan, giving priority to ensuring key steam demands and avoiding the impact on important production links caused by improper power distribution; when the power is sufficient, the charging strategy is optimized to reduce energy consumption and costs, achieving double benefits of safety and economy.

[0067] In some technical solutions, the generating the charging plan according to the steam demand and the remaining capacity of the transformer includes the steps of:

[0068] S231. If the steam demand exceeds the rated steam demand, control the energy storage device 20 and the heat pump device 10 to charge using valley electricity, and then control the energy storage device 20 and the heat pump device 10 to charge using flat electricity until the steam volume is replenished to the steam demand.

[0069] S232. If the steam demand does not exceed the rated steam demand, control the energy storage device 20 and the heat pump device 10 to charge using valley electricity.

[0070] Specifically, as Figure 3 shown, the data acquisition layer realizes the detection of electricity price periods, which include peak electricity periods, peak electricity periods, flat electricity periods, and valley electricity periods. The detection results of the electricity price periods are uploaded to the intelligent decision-making layer, and the engine of the intelligent decision-making layer plans the charging plan according to the detection results of the electricity price periods, the steam demand, and the obtained rated steam demand. Among them, when the steam demand exceeds the rated steam demand, first control the energy storage device 20 and the heat pump device 10 to charge using valley electricity. If the charging with valley electricity is still insufficient, then control them to charge using flat electricity until the steam volume reaches the demand. If the steam demand does not exceed the rated steam demand, only controlling the energy storage device 20 and the heat pump device 10 to charge using valley electricity can meet the demand.

[0071] Since the price of valley electricity is usually lower than that of flat electricity, preferentially using valley electricity in this application can reduce the operating cost. In the charging plan, flat electricity is only used to supplement when valley electricity is insufficient, ensuring economy and steam supply reliability. This application rationally allocates valley electricity and flat electricity according to the charging plan. In this way, the steam supply system can achieve stable steam supply under different steam demands, can flexibly adjust the charging method according to different steam demands, adapt to variable production conditions, enable the system to operate efficiently under various conditions, enhance the ability to cope with peak demands, and improve the overall reliability. In addition, the charging plan of this application is formulated based on the remaining capacitance of the transformer, avoiding overload, ensuring the safe operation of the steam supply system, preventing failures or accidents caused by overloading, and can also achieve the optimal steam supply guarantee under power capacity constraints, balancing safety, economy and reliability, and improving the comprehensive performance of the system and the energy utilization efficiency.

[0072] In some technical solutions, the duration of controlling the heat pump device 10 to charge with flat electricity is lower than a preset duration. The preset duration can be set by itself, and the preset duration can be 2 hours, 3 hours, half an hour, etc. Since the electricity price during the flat electricity period is usually higher than that during the valley electricity period. Strictly controlling the charging duration of the heat pump during the flat electricity period can reduce the electricity consumption during the high electricity price period and lower the overall energy supply cost. In addition, restricting the usage duration of the heat pump during the flat electricity period can prevent a large amount of power demand from concentrating in a short period of time, avoid transformer overload or grid fluctuations, and ensure the stability of the system. During the flat electricity period, other equipment in the factory may also be running. Controlling the charging duration of the heat pump can preferentially guarantee the power supply of key equipment, avoid power shortage or frequent start-stop of other equipment due to excessive electricity consumption of the heat pump, and improve production efficiency and equipment life. Limiting the charging duration of the heat pump within a short range can prompt the system to make more use of the low-price electricity during the valley electricity period for energy storage and heating, improving the utilization rate of valley electricity resources. Moreover, restricting the usage duration of the heat pump during the flat electricity period can promote the system to optimize the operation strategy, such as maximizing the energy storage capacity of the heat pump and the molten salt heat storage module during the valley electricity period, improving the overall energy efficiency of the system, which helps the system to allocate power resources more reasonably, reduce energy waste, and improve operation economy and reliability. In addition, restricting the charging duration of the heat pump during the flat electricity period enables the system to more flexibly adjust the operation strategy in the face of emergencies (such as a sudden increase in order volume or equipment failure). For example, the saved electricity can be used for other key equipment or emergency measures to ensure production continuity and stability. Moreover, there are differences in steam demand and power supply in different seasons and production cycles. Controlling the usage duration of the heat pump during the flat electricity period can enable the system to more flexibly adapt to these changes, adjust the energy storage and heating arrangements during the valley electricity period, meet the energy usage requirements in different situations, and improve the adaptability and reliability of the system.

[0073] In some technical solutions, generating the charging plan according to the steam demand, the remaining capacitance of the transformer, and the charging states of all the energy storage modules in the energy storage device 20 includes the steps of:

[0074] S241. If the steam demand exceeds the rated steam demand, select a preset number of the energy storage modules to stop charging according to the charging states, and control the remaining energy storage modules and the heat pump device 10 to charge using valley electricity, and then control the remaining energy storage modules and the heat pump device 10 to charge using flat electricity, so that the steam volume is replenished to the steam demand;

[0075] S242. If the steam demand does not exceed the rated steam demand, control the energy storage device 20 and the heat pump device 10 to charge using valley electricity.

[0076] Specifically, the preset number of selected energy storage modules is the preset number of energy storage modules with the largest charge amount among all the energy storage modules. When the steam demand exceeds the rated steam demand, select a preset number of energy storage modules to stop charging according to the charging states, and control the remaining energy storage modules and the heat pump device 10 to charge using valley electricity, and then control the remaining energy storage modules and the heat pump device 10 to charge using flat electricity to replenish the steam volume to the required steam demand. For example, there are multiple molten salt energy storage modules. Close the energy storage module with the largest charge amount to achieve load balancing, and let other energy storage modules continue to charge using valley electricity and flat electricity to meet the additional steam demand. When the steam demand does not exceed the rated steam demand, control the energy storage device 20 and the heat pump device 10 to charge using valley electricity. This means that under normal steam demand conditions, the system operates according to the conventional valley electricity charging strategy to ensure the economy and efficiency of the system.

[0077] When the steam demand exceeds the rated value in this application, by reasonably distributing the charging tasks, the continuity and stability of the steam supply are ensured. For example, when the order volume suddenly increases and the steam demand rises, the system can timely adjust the charging strategy to avoid insufficient steam supply affecting production. When the steam demand does not exceed the rated value in this application, the low-price electricity during the valley electricity period is fully utilized for charging to reduce the operating cost. By reasonably arranging the charging time, the high-price electricity consumption during the flat electricity period is reduced, and the economy of the system is improved. According to different situations of the steam demand, the charging strategy is flexibly adjusted. When the steam demand fluctuates, the system can quickly respond, reasonably allocate the charging resources, and ensure the efficient operation of the system under different working conditions. By reasonably distributing the charging tasks in this application, overcharging of some energy storage modules is avoided, and the wear and aging of the equipment are reduced. For example, stop the charging of some energy storage modules to allow them to get proper rest and cooling, thereby prolonging the service life of the energy storage modules.

[0078] In some technical solutions, the remaining capacitance of the transformer includes the remaining capacitance during valley electricity and the remaining capacitance during flat electricity, and further includes:

[0079] Obtain the maximum capacitance of the steam supply system, and calculate the optimal capacitance based on the remaining capacitance during valley electricity and the remaining capacitance during flat electricity;

[0080] Compare the magnitudes of the steam demand, the optimal capacitance, and the maximum capacitance;

[0081] If the steam demand is lower than the optimal capacitance, control the heat pump device 10 to be charged using valley electricity;

[0082] If the steam demand is higher than the maximum capacitance, prompt that the remaining capacitance of the transformer is insufficient, and control to reduce the charging power of the steam supply system;

[0083] If the steam demand is higher than the optimal capacitance and lower than the maximum capacitance, control the heat pump device 10 to be charged using valley electricity and flat electricity according to the valley-to-flat ratio.

[0084] Specifically, in this application, the maximum steam supply amount (physical limit) and the optimal steam supply amount (optimal cost) of the steam supply system can be calculated based on the remaining capacitance during valley electricity and the remaining capacitance during flat electricity. Compare the predicted steam demand with the maximum steam supply amount and the optimal steam supply amount to determine whether the demand can be met. When the steam demand ≤ the optimal capacitance, when the forced heat pump and the molten salt storage tank are charged only using valley electricity, avoiding the high-cost periods of flat electricity or peak electricity. When the steam demand > the maximum steam supply amount, trigger a safety strategy, that is, limit the charging power of the steam supply system to drop to a safety threshold (such as the transformer load rate ≤ 95%), and use the remaining flat electricity capacity to supplement heat storage (such as heat pump water replenishment or molten salt auxiliary heating), but it is still limited by the total transformer capacity. When the steam demand is between the optimal steam supply amount and the maximum steam supply amount, allocate the charging time periods according to the valley-to-flat configuration value ratio. For example, complete 80% of the charging during the valley electricity period and supplement 20% during the flat electricity period. In this way, through the coupling constraint of the heat pump water production amount and the molten salt heat release amount, ensure that the total steam supply amount meets the demand and the cost is the lowest. In this way, the steam supply system of this application can achieve the balance between the steam supply amount and the economic benefit under the condition of insufficient transformer capacity, while ensuring power safety.

[0085] For example, based on the electricity consumption prediction of the factory, the remaining capacity (curve) of the transformer is obtained, and the gas supply capacity range is determined accordingly. The remaining capacity of the transformer includes the remaining capacity during off-peak electricity and the remaining capacity during normal electricity. For example, the molten salt module preferentially operates during off-peak electricity and operates during normal electricity when off-peak electricity is insufficient; the heat pump preferentially operates during off-peak electricity after the molten salt module and operates during normal electricity when off-peak electricity is insufficient; the amount of cold water heated by the heat pump to 95° is equivalent to the amount of steam generated by heating the 95° high-temperature water to the target steam temperature after the molten salt module completely releases heat; the maximum steam supply amount is calculated according to the above constraints. Then, the optimal steam supply amount is calculated based on the operation of both the molten salt module and the heat pump during off-peak electricity.

[0086] Predict the steam demand. When the steam demand is less than or equal to the optimal steam supply amount, the heat pump operates completely during off-peak electricity; when the steam demand exceeds the maximum steam supply amount, an electricity shortage warning is issued; when the steam demand is between the two, the valley-to-plain power ratio of the heat pump operation is determined according to the condition that the heat pump preferentially operates during off-peak electricity.

[0087] During normal electricity, if the actual steam consumption (curve) exceeds the predicted steam demand, control the water replenishment of the heat pump and the heat replenishment of the molten salt module until an electricity capacity shortage warning is issued when approaching the maximum steam supply amount (curve);

[0088] When the predicted steam demand is close to the maximum steam supply amount, during normal electricity, once there is a surplus of the actual electricity (curve), control the water replenishment of the heat pump and the heat replenishment of the molten salt module to obtain the set safety factor of the gas supply capacity.

[0089] In this embodiment, based on the electricity consumption prediction of the factory, the remaining capacity (curve) of the transformer is obtained, and then the gas supply capacity range is obtained accordingly, including the maximum steam supply amount and the optimal steam supply amount; after obtaining the valley-to-plain power ratio according to the predicted steam demand, heat storage is carried out according to the valley-to-plain power ratio during off-peak electricity and heat replenishment is carried out during normal electricity to achieve the optimization of the system energy efficiency.

[0090] In some technical solutions, the valley-to-plain power ratio is the ratio of the charging power during normal electricity to the charging power during off-peak electricity, and the valley-to-plain power ratio is negatively correlated with the remaining electricity capacity during off-peak electricity and the steam demand.

[0091] Specifically, the flat-valley ratio usually refers to the ratio of the charging power during the flat electricity period to the charging power during the valley electricity period, rather than simply the ratio of durations. This ratio reflects the power distribution of the heat pump during the flat electricity and valley electricity periods. If the remaining electricity capacity during the valley electricity period is large, the heat pump can operate at a higher power during the valley electricity period, making full use of the advantage of low electricity prices. At this time, the flat-valley ratio is relatively low because the charging power during the flat electricity period is relatively small; conversely, if the remaining electricity capacity during the valley electricity period is small, the operating power of the heat pump during the valley electricity period is limited, and it may be necessary to increase the charging power during the flat electricity period to meet the steam demand. At this time, the flat-valley ratio is relatively high. If the steam demand is low, the operation of the heat pump during the valley electricity period can meet most of the demand, and the charging power during the flat electricity period can be relatively small, with a relatively low flat-valley ratio; conversely, if the steam demand is high, the operation of the heat pump during the valley electricity period may not be sufficient to meet all the demand, and it is necessary to increase the charging power during the flat electricity period, with a relatively high flat-valley ratio.

[0092] In some technical solutions, it further includes:

[0093] When it is monitored that the remaining electricity capacity of the transformer is lower than the first remaining electricity capacity threshold, it is prompted that the remaining electricity capacity of the transformer is insufficient;

[0094] When it is monitored that the remaining electricity capacity of the transformer is lower than the second remaining electricity capacity threshold, it is prompted that the remaining electricity capacity of the transformer is insufficient, and a preset number of the energy storage modules are selected to stop charging according to the charging state.

[0095] Specifically, when it is monitored that the remaining electricity capacity of the transformer is lower than the first remaining electricity capacity threshold (such as 90% capacity), it is prompted that the remaining electricity capacity of the transformer is insufficient. At this time, it is equivalent to a warning signal to remind the system to pay attention to the current electricity consumption situation and prepare to take measures. When it is monitored that the remaining electricity capacity of the transformer is lower than the second remaining electricity capacity threshold (such as 95% capacity), it is prompted that the remaining electricity capacity of the transformer is insufficient, and a preset number of energy storage modules are selected to stop charging according to the current charging state. Further actions are taken to reduce the electricity load of the system by stopping the charging of some energy storage modules to avoid transformer overload.

[0096] By setting two levels of thresholds (the first remaining electricity capacity threshold and the second remaining electricity capacity threshold) in this application, it can issue a warning in time when the remaining electricity capacity of the transformer is insufficient and take corresponding measures to avoid damage to the transformer due to overload, ensuring the safe and stable operation of the entire system. The charging strategy can be dynamically adjusted according to the remaining electricity capacity of the transformer. On the premise of ensuring safety, the capacity of the transformer can be fully utilized to improve the utilization efficiency of resources. And it helps to achieve refined management of the transformer and the entire system. Through real-time monitoring and response to the remaining electricity capacity, the operation of the system is made more scientific and reasonable.

[0097] In some technical solutions, it further includes:

[0098] Obtain historical power consumption data and order data, and obtain the required power consumption capacity according to the historical power consumption data and the order data.

[0099] Specifically, historical power consumption data of a factory or park over a period of time (such as several months to one year) can be collected. The historical power consumption data includes information such as power consumption per hour or per day, power factor, and transformer load rate. Organize the production order records of the factory or park to obtain order data. The order records include order quantity, production time, product type, etc. Analyze the correlation between different order types and power consumption requirements, so as to extract features related to power consumption requirements from the order records to obtain order data. At the same time, organize other data related to power consumption, such as production order volume, working days and rest days, seasonal changes, etc., in order to understand the power consumption pattern more comprehensively. Time series analysis methods, such as ARIMA (Autoregressive Integrated Moving Average Model), etc., can be used to model and predict the historical power consumption data. This method can capture features such as trends, seasonality, and periodicity in the power consumption data, so as to predict the required power consumption capacity for a certain period in the future.

[0100] In some technical solutions, the feasibility of the charging plan can be verified according to the transformer load situation. For example, compare the current remaining available power capacity of the transformer with the power capacity required by the charging plan. If the remaining capacity is greater than or equal to the capacity required by the charging plan, the plan is feasible; otherwise, it needs to be adjusted. For another example, analyze the power curve of the charging plan to check whether the power demand in different time periods exceeds the carrying capacity of the transformer, especially the power peaks during valley power and flat power periods, to ensure that the transformer will not be overloaded. For another example, consider the safety thresholds of the transformer (the first remaining power capacity threshold and the second remaining power capacity threshold) to ensure that after the implementation of the charging plan, the load of the transformer will not approach or exceed the warning thresholds, such as 90% and 95% capacity limits, to avoid triggering the safety protection mechanism.

[0101] In some implementation schemes, according to the energy storage situation of each molten salt storage tank, preferentially close the storage tanks with more energy storage, reduce their charging power, and achieve a reduction in the overall charging power. Control the rising speed of the charging power, such as setting a power ramp rate limit of 5% / min, so that the charging power gradually increases, avoiding a sharp rise in power within a short period of time, which may cause the transformer load to be too heavy.

[0102] Through the above methods, the charging power can be effectively reduced when the system load is close to the warning threshold, ensuring the safe operation of the transformer and at the same time meeting the charging requirements of the molten salt thermal energy storage system as much as possible.

[0103] As Figure 1 shown, the present application also provides a control system for energy storage-coupled heat pump steam supply, including:

[0104] A heat pump device 10, an energy storage device 20, and a controller;

[0105] The heat exchange medium sequentially passes through the heat pump device 10 and the energy storage device 20 for step-by-step heating, successively generating stored hot water with a first temperature and water vapor with a second temperature for supplying to the user side;

[0106] The controller is used to obtain target data, and the target data includes the remaining capacitance of the transformer, the required power consumption capacitance, and the steam demand on the application side;

[0107] The controller is used to generate a charging plan according to the remaining capacitance of the transformer, the required power consumption capacitance, and the steam demand;

[0108] Control the heat pump device 10 and the energy storage device 20 to charge according to the charging plan.

[0109] This embodiment is a system embodiment corresponding to the above method embodiment. For the same technical effects, refer to the above embodiment and will not be elaborated here one by one.

[0110] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

[0111] Those skilled in the art should understand that although the present invention is described in the form of multiple embodiments, not every embodiment only contains an independent technical solution. The description in the specification is only for clarity. Those skilled in the art should understand the specification as a whole and consider the technical solutions involved in each embodiment as ways that can be combined with each other to form different embodiments to understand the protection scope of the present invention.

[0112] It should be noted that although the above control method describes each step in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these changes are all within the protection scope of the present invention.

Claims

1. A method for controlling steam supply of energy storage coupled heat pump, characterized in that: Applied to a steam supply system, the steam supply system includes a heat pump device and an energy storage device, the heat exchange medium is sequentially heated by the heat pump device and the energy storage device, and the stored hot water with a first temperature and the water vapor with a second temperature for supplying the user end are sequentially generated. The control method includes the steps of: Acquiring target data, wherein the target data includes the remaining capacity of the transformer, the required power capacity, and the steam demand on the application side; Generate a charging plan according to the remaining capacity of the transformer, the required power capacity and the steam demand; The heat pump device and the energy storage device are controlled to charge according to the charging plan.

2. The control method for steam supply of energy storage coupled heat pump according to claim 1, characterized in that: The energy storage device includes at least two energy storage modules, and generating a charging plan according to the remaining capacity of the transformer, the required power capacity and the steam demand includes the following steps: Obtaining the maximum available power capacity of the steam supply system according to the rated power capacity of the transformer and the required power capacity; The maximum available power capacity of the system is positively correlated with the rated power capacity of the transformer, and the maximum available power capacity of the system is negatively correlated with the required power capacity; Comparing the remaining capacity of the transformer with the maximum available capacity of the system; If the maximum available power capacity of the system exceeds the remaining power capacity of the transformer, generating the charging plan according to the steam demand and the remaining power capacity of the transformer; If the maximum available power capacity of the system does not exceed the remaining power capacity of the transformer, the charging plan is generated according to the steam demand, the remaining power capacity of the transformer and the charging status of all the energy storage modules in the energy storage device.

3. The control method for steam supply of energy storage coupled heat pump according to claim 2 is characterized in that: The step of generating the charging plan according to the steam demand and the remaining capacity of the transformer comprises the following steps: If the steam demand exceeds the rated steam demand, controlling the energy storage device and the heat pump device to charge with valley electricity, and then controlling the energy storage device and the heat pump device to charge with flat electricity, so that the steam amount is replenished to the steam demand; If the steam demand does not exceed the rated steam demand, the energy storage device and the heat pump device are controlled to charge with valley electricity.

4. The control method for steam supply of energy storage coupled heat pump according to claim 3 is characterized in that: The duration for which the heat pump device is charged with flat electricity is controlled to be shorter than a preset duration.

5. The method for controlling steam supply of energy storage coupled heat pump according to claim 2, characterized in that: The step of generating the charging plan according to the steam demand, the remaining capacity of the transformer and the charging status of all the energy storage modules in the energy storage device comprises the following steps: If the steam demand exceeds the rated steam demand, a preset number of the energy storage modules are selected to stop charging according to the charging state, and the remaining energy storage modules and the heat pump device are controlled to charge using valley power, and then the remaining energy storage modules and the heat pump device are controlled to charge using valley power, so that the steam volume is replenished to the steam demand; If the steam demand does not exceed the rated steam demand, the energy storage device and the heat pump device are controlled to charge with valley electricity.

6. The control method for steam supply of energy storage coupled heat pump according to claim 3 or 5, wherein the transformer residual capacity includes valley power residual capacity and flat power residual capacity, characterized in that: Also includes: The maximum capacity of the steam supply system is obtained, and the optimum capacity is calculated according to the valley power remaining capacity and the flat power remaining capacity; comparing the steam demand, the optimum electrical capacity and the maximum electrical capacity; If the steam demand is lower than the optimal electrical capacity, controlling the heat pump device to charge with valley electricity; If the steam demand is higher than the maximum capacity, it is prompted that the remaining capacity of the transformer is insufficient, and the charging power of the steam supply system is controlled to be reduced; If the steam demand is higher than the optimal capacity and lower than the maximum capacity, the heat pump device is controlled to charge with valley power and flat power according to the flat-valley ratio.

7. The method for controlling steam supply of energy storage coupled heat pump according to claim 6, characterized in that: The flat-to-valley ratio is the ratio of the charging power during the flat-power period to the charging power during the valley-power period, and the flat-to-valley ratio is negatively correlated with the remaining valley-power capacity and the steam demand.

8. The method for controlling steam supply of energy storage coupled heat pump according to claim 2, characterized in that: Also includes: When the remaining capacity of the transformer is monitored to be lower than a first remaining capacity threshold, a prompt is given that the remaining capacity of the transformer is insufficient; When the remaining capacity of the transformer is monitored to be lower than a second remaining capacity threshold, it is prompted that the remaining capacity of the transformer is insufficient, and a preset number of the energy storage modules are selected to stop charging according to the charging state.

9. A method for controlling steam supply of an energy storage coupled heat pump according to any one of claims 1 to 8, characterized in that: Also includes: Historical electricity consumption data and order data are acquired, and the required electricity capacity is obtained according to the historical electricity consumption data and the order data.

10. A control system for energy storage coupled heat pump steam supply, characterized in that: include: Heat pump devices, energy storage devices and controllers; The heat exchange medium is heated step by step by the heat pump device and the energy storage device in sequence, and the stored hot water with a first temperature and the water vapor with a second temperature for supplying the user end are generated in sequence; The controller is used to obtain target data, wherein the target data includes the remaining capacity of the transformer, the required power capacity and the steam demand on the application side; The controller is used to generate a charging plan according to the remaining power capacity of the transformer, the required power capacity and the steam demand; The heat pump device and the energy storage device are controlled to charge according to the charging plan.

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