Optimization strategy for improving synergy of comprehensive energy system based on multiple energy storage systems

Abstract

The invention relates to an optimization strategy for improving the collaboration of an integrated energy system based on multiple energy storage systems, and belongs to the technical field of integrated energy collaborative scheduling. Aiming at the problems of energy shortage and environmental pollution, the invention provides a method for improving the collaboration of a comprehensive energy system by utilizing multiple energy storage including battery energy storage and a heat storage tank. According to the method, cooperative evaluation indexes such as economy, new energy consumption and load power supply are constructed, the influence of multiple energy storage on the system is analyzed, and comprehensive evaluation indexes are calculated to optimize system operation; the method comprises the specific implementation steps of constructing an economic index, determining a new energy consumption evaluation index, establishing a stability evaluation index, formulating a comprehensive evaluation index, establishing a multi-energy storage system model and analyzing the influence of multi-energy storage on the system. According to the method, the synergistic effect, the energy utilization efficiency and the system operation economy of the comprehensive energy system are remarkably improved, waste and load loss of new energy are reduced, and powerful support is provided for sustainable development of the energy industry.

Description

Technical Field

[0001] The present invention relates to the technical field of coordinated scheduling and optimization of integrated energy systems, and in particular to an optimization strategy for improving the coordination of integrated energy systems based on multiple energy storage systems. Background Art

[0002] Against the backdrop of increasingly severe energy shortages and environmental pollution, the Integrated Energy System (IES) has received extensive attention in recent years as an important means to achieve energy transformation and reduce carbon emissions. The IES aims to improve energy efficiency and promote the consumption of new energy by integrating multiple energy subsystems (such as electricity, natural gas, photovoltaic power generation, wind power generation, etc.). However, the synergy between different energy subsystems has an important impact on the overall operation of the IES.

[0003] The synergy theory was proposed by Haken, emphasizing the collective effect of the interaction of multiple subsystems. In the field of integrated energy systems, there are relatively few studies on the nature of synergy, and they are mainly focused on the economic operation of the system. For example, "Random Optimal Dispatching of Low-Carbon Park Integrated Energy Systems with Carbon Capture and Power-to-Hydrogen Equipment" in Volume 47, Issue 2 of China Electric Power proposed a random optimization method for the optimal operation of the integrated energy system to enhance the economy of the system operation. Similarly, "Day-ahead-intraday coordinated optimal dispatching of integrated energy systems taking into account source and load uncertainty" in Volume 47, Issue 9 of Power System Technology also conducted research related to the uncertainty of integrated energy systems. Although these studies have improved the economy of the system to a certain extent, they have not deeply explored the role of multiple energy storage systems in improving the synergy of the system.

[0004] In addition, the "Game-based Optimal Dispatching of Distribution Networks with Shared Energy Storage Leased by Multiple Microgrids" in Volume 42, Issue 18 of the Proceedings of the CSEE proposed a multi-microgrid hybrid energy sharing framework to ensure a balanced distribution of benefits among different microgrids. However, this framework does not directly address the role of multiple energy storage systems in improving the synergy of the integrated energy system. Although literature such as "Planning Technology for Multi-Energy Complementarity of Water, Wind, Solar and Storage" in Volume 10, Issue 2 of Hydropower and Pumped Storage and "Research on Operation Optimization of Multi-Energy Complementarity Systems with Energy Storage" in Volume 24, Issue 3 of Electrical Engineering have established a benefit evaluation model for multi-energy complementary power generation systems containing multiple energy storages and proposed a coordinated energy management solution, these studies mainly focus on the economy and stability of the system, and the analysis of how multi-energy storage systems can improve system synergy is still insufficient.

[0005] In particular, although the article “Research on Demand Response Strategy of Energy Storage System Based on Multi-energy Complementarity” in Volume 42, Issue 11 of Automation Technology and Applications studied a new multi-storage energy management system to jointly optimize electric mobile energy storage and thermal energy storage, its effectiveness in improving system synergy still needs further verification.

[0006] In summary, existing research has achieved certain results in the economy, stability and multi-energy complementarity of integrated energy systems, but the discussion on the improvement of the synergy of integrated energy systems by multiple energy storage systems is still weak. Therefore, the present invention proposes an optimization scheme based on multiple energy storage systems to improve the synergy of integrated energy systems, aiming to analyze the role of multiple energy storage systems in improving the synergy of integrated energy systems by constructing comprehensive evaluation indicators, and provide new ideas and methods for the optimal scheduling of integrated energy systems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an optimization strategy based on multiple energy storage systems to improve the synergy of the integrated energy system, to solve the problem of insufficient synergy between different energy subsystems in the integrated energy system, and the resulting specific problems of low energy utilization efficiency, limited new energy consumption, and poor system operation economy.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is an optimization strategy based on multiple energy storage systems to improve the synergy of the integrated energy system, including the following steps: Step 1: Construct an economic index based on the total cost of the integrated energy system, where the economic index is the cost of purchasing electricity and gas minus the income from selling electricity; Step 2: Determine the new energy consumption evaluation index based on the amount of new energy abandoned by the comprehensive energy system; Step 3: Establish stability evaluation index according to the load loss of the integrated energy system; Step 4: Based on the collaborative work of multiple energy subsystems, a synergistic effect is formed to formulate a comprehensive evaluation index. The smaller the comprehensive evaluation index, the higher the synergistic ability of the comprehensive energy system; Step 5: Establish a multi-energy storage system model, including a battery energy storage device model and a heat storage tank model, which are used to store or release electrical energy and thermal energy respectively; Step 6: Analyze the impact of multiple energy storage on the integrated energy system and calculate the minimum value of the comprehensive evaluation index.

[0009] In the preferred solution, the economic evaluation index in Step 1 is The cost of purchasing electricity and gas minus the income from selling electricity is expressed as: (1) In the formula, The cost of purchasing electricity from the grid; For the cost of purchasing natural gas; It is the income from selling electricity to the grid; is the price of electricity sold to the grid; is the electricity sold; is the time interval; is the price of natural gas; and are the gas consumption of micro gas turbine and gas boiler respectively; The price of electricity purchased from the grid; It's purchasing power.

[0010] In the preferred solution, the new energy consumption evaluation index in Step 2 is is the amount of new energy abandoned by the comprehensive energy system, specifically expressed as: (2) In the formula, and are the prices of abandoned photovoltaic and wind power respectively; is the wasted photovoltaic power; It is abandoned wind power.

[0011] In the preferred solution, the stability evaluation index in Step 3 is is the load loss, specifically expressed as: (3) In the formula, , , They are the prices of lost electrical load, cooling load and heating load respectively; , , They are the power loss of electricity, cooling and heating loads respectively.

[0012] In a preferred solution, the Comprehensive Evaluation Index (CEI) is the inverse of the weighted sum or product of the economic index, the new energy consumption evaluation index and the stability evaluation index, which is specifically expressed as: (4) In the formula, It is a comprehensive evaluation index. The smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

[0013] In a preferred solution, the smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

[0014] In a preferred solution, the multi-energy storage system model in Step 5 includes two types of energy storage device models, namely a battery energy storage device model and a heat storage tank model: The battery model is shown in the following formula, which respectively represents the relationship between the remaining battery capacity and the charge and discharge power, the charge and discharge power constraint, and the remaining capacity constraint: (5) (6) (7) In the formula, , They are Moment and The energy of the energy storage system at any moment, , , They are self-discharge coefficient and charge-discharge efficiency, is the maximum charge and discharge power, and are the minimum and maximum energy of the battery respectively; The model of the heat storage tank is shown in the following formula, which respectively represents the relationship between the remaining capacity of the heat storage tank and the charging and discharging heating power, the constraint of the charging and discharging heating power, and the constraint of the remaining capacity: (8) (9) (10) In the formula, , They are Moment and The energy of the thermal storage system at the moment, , , They are the self-discharge heating coefficient, thermal charge and discharge efficiency, is the maximum charging and discharging heating power of the thermal storage system, and are the minimum and maximum energies of the thermal energy storage system, respectively.

[0015] The preferred scheme also includes a step of analyzing the impact of multiple energy storage systems with different rated powers on the synergy of the integrated energy system, and verifying the role of the multiple energy storage systems in improving the synergy of the integrated energy system by calculating the minimum value of the comprehensive evaluation index.

[0016] The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems provided by the present invention has the following beneficial effects: 1. The present invention solves the problem of insufficient synergy between different energy subsystems in the integrated energy system, as well as the resulting problems of low energy utilization efficiency, limited consumption of new energy, and poor economic efficiency of system operation; 2. The present invention overcomes the limitation of poor coordination of the integrated energy system in the prior art, and realizes the improvement of energy utilization rate, the effective consumption of new energy and the optimization of system operation economy; 3. The present invention not only considers the application of a single energy storage system, but also innovatively introduces the collaborative work of multiple energy storage systems (including battery energy storage devices and heat storage tanks), and improves the overall performance and synergy of the integrated energy system by optimizing the configuration and scheduling of the energy storage system; 4. The present invention constructs a comprehensive evaluation system including economic indicators, new energy consumption evaluation indicators and stability evaluation indicators to comprehensively evaluate the operation effect of the comprehensive energy system and provide a scientific basis for optimizing scheduling; 5. The present invention establishes a detailed battery energy storage device model and a heat storage tank model, taking into account factors such as charging and discharging power constraints and remaining capacity constraints, and provides an accurate mathematical model for the optimal scheduling of the energy storage system; 6. The present invention constructs comprehensive evaluation indicators to coordinately optimize the comprehensive energy system from three dimensions: economy, new energy consumption and stability, thus achieving multi-objective optimization and improving the overall performance of the system; 7. The present invention makes full use of the complementarity of the battery energy storage device and the heat storage tank, and realizes the coordinated work between different energy storage systems by optimizing the scheduling strategy, thereby improving the energy utilization efficiency and system stability; 8. Through case analysis, this invention verifies the effectiveness of multi-energy storage systems in improving the synergy of integrated energy systems and demonstrates the potential and advantages of this solution in practical applications; 9. The present invention significantly improves the synergy effect, energy utilization efficiency and system operation economy of the comprehensive energy system, reduces the waste of new energy and load loss, and provides strong support for the sustainable development of the energy industry; 10. This invention not only enriches the theoretical research on coordinated scheduling of integrated energy systems, but also provides effective technical support and solutions for practical engineering applications. It has important practical application value and promotion prospects. With the advancement of technology and further reduction of costs, multi-energy storage systems are expected to become the standard configuration of integrated energy systems and promote the green transformation of energy structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples: Figure 1 is a system structure diagram of the present invention; Figure 2It is the multi-load and wind-solar output curve of the integrated energy system of the present invention; Figure 3 The electric load loss curves of different rated powers of the present invention; Figure 4 The heat load loss curves of the present invention with different rated powers; Figure 5 The abandoned photovoltaic power curves of different rated powers of the present invention; Figure 6 This is the wind power abandonment curve of different rated powers of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the embodiments and drawings: Example 1 The optimization strategy for improving the coordination of the integrated energy system based on multiple energy storage systems includes the following steps: Step 1: Construct an economic index based on the total cost of the integrated energy system, where the economic index is the cost of purchasing electricity and gas minus the income from selling electricity; Step 2: Determine the new energy consumption evaluation index based on the amount of new energy abandoned by the comprehensive energy system; Step 3: Establish stability evaluation index according to the load loss of the integrated energy system; Step 4: Based on the collaborative work of multiple energy subsystems, a synergistic effect is formed to formulate a comprehensive evaluation index. The smaller the comprehensive evaluation index, the higher the synergistic ability of the comprehensive energy system; Step 5: Establish a multi-energy storage system model, including a battery energy storage device model and a heat storage tank model, which are used to store or release electrical energy and thermal energy respectively; Step 6: Analyze the impact of multiple energy storage on the integrated energy system and calculate the minimum value of the comprehensive evaluation index.

[0019] Furthermore, the economic evaluation index in Step 1 The cost of purchasing electricity and gas minus the income from selling electricity is expressed as: (1) In the formula, The cost of purchasing electricity from the grid; For the cost of purchasing natural gas; It is the income from selling electricity to the grid; is the price of electricity sold to the grid; is the electricity sold; is the time interval; is the price of natural gas; and are the gas consumption of micro gas turbine and gas boiler respectively; The price of electricity purchased from the grid; It's purchasing power.

[0020] Furthermore, the new energy consumption evaluation index in Step 2 is the amount of new energy abandoned by the comprehensive energy system, specifically expressed as: (2) In the formula, and are the prices of abandoned photovoltaic and wind power respectively; is the wasted photovoltaic power; It is abandoned wind power.

[0021] Furthermore, the stability evaluation index in Step 3 is the load loss, specifically expressed as: (3) In the formula, , , They are the prices of lost electrical load, cooling load and heating load respectively; , , They are the power loss of electricity, cooling and heating loads respectively.

[0022] Furthermore, the Comprehensive Evaluation Index (CEI) is the inverse of the weighted sum or product of the economic index, the new energy consumption evaluation index and the stability evaluation index, which is specifically expressed as: (4) In the formula, It is a comprehensive evaluation index. The smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

[0023] Furthermore, the smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

[0024] Furthermore, the multi-energy storage system model in Step 5 includes two types of energy storage device models, namely a battery energy storage device model and a heat storage tank model: The battery model is shown in the following formula, which respectively represents the relationship between the remaining battery capacity and the charge and discharge power, the charge and discharge power constraint, and the remaining capacity constraint: (5) (6) (7) In the formula, , They are Moment and The energy of the energy storage system at any moment, , , They are self-discharge coefficient and charge-discharge efficiency, is the maximum charge and discharge power, and are the minimum and maximum energy of the battery respectively; The model of the heat storage tank is shown in the following formula, which respectively represents the relationship between the remaining capacity of the heat storage tank and the charging and discharging heating power, the constraint of the charging and discharging heating power, and the constraint of the remaining capacity: (8) (9) (10) In the formula, , They are Moment and The energy of the thermal storage system at the moment, , , They are the self-discharge heating coefficient, thermal charge and discharge efficiency, is the maximum charging and discharging heating power of the thermal storage system, and are the minimum and maximum energies of the thermal energy storage system, respectively.

[0025] Example 2 In another preferred embodiment, based on the above embodiment 1, Figures 1 to 6 As shown in the figure, the specific implementation plan of the optimization strategy based on multiple energy storage systems to improve the synergy of the integrated energy system is as follows: 1. Overview of Integrated Energy System The integrated energy system involved in the present invention includes multiple energy subsystems, such as electricity, cooling, heating, etc., and meets different load requirements through energy conversion and storage facilities. The system includes multiple energy sources such as power grid, natural gas, photovoltaic power generation and wind power generation. In order to optimize the synergy of the system, the present invention introduces a multi-energy storage system, including a battery energy storage device and a heat storage tank model.

[0026] 2. Construction of Economic Indicators First, the economic index is constructed based on the total cost of the integrated energy system. The economic evaluation index is the cost of purchasing electricity and gas minus the income from selling electricity. The specific formula is as follows: (1) In the formula, The cost of purchasing electricity from the grid; For the cost of purchasing natural gas; It is the income from selling electricity to the grid; is the price of electricity sold to the grid; is the electricity sold; is the time interval; is the price of natural gas; and are the gas consumption of micro gas turbine and gas boiler respectively; The price of electricity purchased from the grid; It's purchasing power.

[0027] 3. Determination of evaluation indicators for new energy consumption The new energy consumption evaluation index is the amount of new energy abandoned by the comprehensive energy system, which is specifically expressed as: (2) In the formula, and are the prices of abandoned photovoltaic and wind power respectively; is the wasted photovoltaic power; It is abandoned wind power.

[0028] 4. Establishment of stability evaluation indicators The stability evaluation index is the load loss, which is specifically expressed as: (3) In the formula, , , They are the prices of lost electrical load, cooling load and heating load respectively; , , They are the power loss of electricity, cooling and heating loads respectively.

[0029] V. Formulation of comprehensive evaluation indicators Comprehensive Evaluation Index (CEI) is an economic index , New energy consumption evaluation indicators and stability evaluation index The inverse of the weighted sum or product of is expressed as: (4) In the formula, It is a comprehensive evaluation index. The smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

[0030] The smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

[0031] 6. Establishment of multi-energy storage system model The energy storage system model includes two types of energy storage device models, namely the battery energy storage device model and the heat storage tank model: 1. The battery model is shown in the following formula, which respectively represents the relationship between the remaining capacity of the battery and the charge and discharge power, the charge and discharge power constraint, and the remaining capacity constraint: (5) (6) (7) In the formula, , They are Moment and The energy of the energy storage system at any moment, , , They are self-discharge coefficient and charge-discharge efficiency, is the maximum charge and discharge power, and are the minimum and maximum energy of the battery respectively; 2. The model of the heat storage tank is shown in the following formula, which respectively represents the relationship between the remaining capacity of the heat storage tank and the charging and discharging heating power, the constraint of the charging and discharging heating power, and the constraint of the remaining capacity: (8) (9) (10) In the formula, , They are Moment and The energy of the thermal storage system at the moment, , , They are the self-discharge heating coefficient, thermal charge and discharge efficiency, is the maximum charging and discharging heating power of the thermal storage system, and are the minimum and maximum energies of the thermal energy storage system, respectively.

[0032] Example 3 In another preferred embodiment, based on the above embodiments 1 and 2, as Figures 1 to 6 As shown, two scenarios are set up: in one scenario, the integrated energy system does not have the two types of energy storage equipment, the battery energy storage device model and the heat storage tank model; in the other scenario, the integrated energy system includes the two types of energy storage, the battery energy storage device model and the heat storage tank model; these two scenarios are compared to verify the role of multi-energy storage systems in enhancing the synergy of the integrated energy system.

[0033] like Figure 2 As shown in Figure 1, the loss electric load, loss heat load, waste photovoltaic and wind power curves of the integrated energy system without multiple energy storage systems; Figure 2 In the figure, the curves are drawn according to formula (2) and formula (3): the power load is relatively large during the period from 17:00 to 21:00, and there is some loss load, with a loss of 487.51 kWh; for the cooling load, the system can always meet the demand and there is no underload; the heating load loss period is from 1:00 to 7:00 and from 19:00 to 24:00, with a total loss load of 277.62 kWh; the power demand at noon is not very high, but the wind power and photovoltaic power are relatively large, so it is necessary to give up some photovoltaic and wind power, which are 298.5 kWh and 257.34 kWh respectively.

[0034] like Figures 3 to 6 As shown in the figure, they are the curves of lost electrical load, lost thermal load, abandoned photovoltaic power and wind power. Figures 3-5 In the example, the curve is drawn according to formula (3). Figure 6 In the equation (2), the curve is drawn according to formula (2); we selected batteries and heat storage tanks with rated capacities of 300 kWh each; Figure 3 In this paper, we selected the more representative rated values ​​of electric energy storage and thermal storage tanks for comparison; for electricity load, photovoltaic, wind power and other electricity-related units, such as Figure 3 , 4 As shown in Figure 5, the loss load and the abandonment of photovoltaic and wind power are reduced; as the rated power of the electric energy storage increases, the loss power decreases; Figure 4 In the equation (2), as the rated power of the heat storage tank increases, the power loss decreases accordingly. Based on formula (2) and formula (3), the role of multiple energy storage systems in improving the synergistic effect of the integrated energy system is demonstrated.

[0035] In summary, the optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems provided by the present invention solves the problem of insufficient synergy between different energy subsystems in the integrated energy system, as well as the resulting specific problems of low energy utilization efficiency, limited new energy consumption, and poor system operation economy; it overcomes the limitations of poor synergy of the integrated energy system in the prior art, and achieves the improvement of energy utilization rate, effective consumption of new energy, and optimization of system operation economy; the present invention provides an innovative and effective optimization scheme by constructing comprehensive synergy evaluation indicators, establishing a multiple energy storage system model, and analyzing the impact of multiple energy storage systems on the integrated energy system, which significantly improves the synergy of the integrated energy system and promotes the efficient utilization of energy and new The wide consumption of energy also optimizes the economic operation of the system; the strategy has demonstrated its strong adaptability and flexibility in practical applications, providing strong support for building a green, low-carbon and efficient energy system, and promoting the sustainable development of the energy industry; in addition, the optimization strategy of the present invention also promotes the construction of the energy Internet, realizes the interconnection and sharing of energy data, and lays a solid foundation for intelligent energy management, indicating that energy management will be more intelligent and refined in the future; looking forward to the future, with the continuous advancement of technology and the deepening of its application, the optimization strategy is expected to be promoted and applied in more fields, leading the energy industry to a higher level of intelligent and green transformation, and contributing greater strength to the optimization and sustainable development of the global energy structure.

Claims

1. An optimization strategy for improving the synergy of an integrated energy system based on multiple energy storage systems, characterized in that: The strategy includes the following steps: Step 1: Construct an economic index based on the total cost of the integrated energy system, where the economic index is the cost of purchasing electricity and gas minus the income from selling electricity; Step 2: Determine the new energy consumption evaluation index based on the amount of new energy abandoned by the comprehensive energy system; Step 3: Establish stability evaluation index according to the load loss of the integrated energy system; Step 4: Based on the collaborative work of multiple energy subsystems, a synergistic effect is formed to formulate a comprehensive evaluation index. The smaller the comprehensive evaluation index, the higher the synergistic ability of the comprehensive energy system; Step 5: Establish a multi-energy storage system model, including a battery energy storage device model and a heat storage tank model, which are used to store or release electrical energy and thermal energy respectively; Step 6: Analyze the impact of multiple energy storage on the integrated energy system and calculate the minimum value of the comprehensive evaluation index.

2. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to claim 1 is characterized by: The economic evaluation index in Step 1 The cost of purchasing electricity and gas minus the income from selling electricity is expressed as: （1） In the formula, The cost of purchasing electricity from the grid; The cost of purchasing natural gas; It is the income from selling electricity to the grid; is the price of electricity sold to the grid; is the electricity sold; is the time interval; is the price of natural gas; and are the gas consumption of micro gas turbine and gas boiler respectively; The price of electricity purchased from the grid; It's purchasing power.

3. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to claim 1 is characterized by: The new energy consumption evaluation index in Step 2 is the amount of new energy abandoned by the comprehensive energy system, specifically expressed as: （2） In the formula, and are the prices of abandoned photovoltaic and wind power respectively; is the wasted photovoltaic power; It is abandoned wind power.

4. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to claim 1 is characterized in that: The stability evaluation index in Step 3 is the load loss, specifically expressed as: （3） In the formula, , , They are the prices of lost electrical load, cooling load and heating load respectively; , , They are the power loss of electricity, cooling and heating loads respectively.

5. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to claim 1 is characterized by: The comprehensive evaluation index CEI is the inverse of the weighted sum or product of the economic index, the new energy consumption evaluation index and the stability evaluation index, and is specifically expressed as: （4） In the formula, It is a comprehensive evaluation index. The smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

6. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to claim 5 is characterized by: The smaller the comprehensive evaluation index is, the higher the coordination ability of the integrated energy system is.

7. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to claim 1 is characterized by: The multi-energy storage system model in Step 5 includes two types of energy storage device models, namely a battery energy storage device model and a heat storage tank model: The battery model is shown in the following formula, which respectively represents the relationship between the remaining battery capacity and the charge and discharge power, the charge and discharge power constraint, and the remaining capacity constraint: （5） （6） （7） In the formula, , They are Moment and The energy of the energy storage system at any moment, , , They are self-discharge coefficient and charge-discharge efficiency, is the maximum charge and discharge power, and are the minimum and maximum energy of the battery respectively; The model of the heat storage tank is shown in the following formula, which respectively represents the relationship between the remaining capacity of the heat storage tank and the charging and discharging heating power, the constraint of the charging and discharging heating power, and the constraint of the remaining capacity: （8） （9） （10） In the formula, , They are Moment and The energy of the thermal storage system at the moment, , , They are the self-discharge heating coefficient, thermal charge and discharge efficiency, is the maximum charging and discharging heating power of the thermal storage system, and are the minimum and maximum energies of the thermal energy storage system, respectively.

8. The optimization strategy for improving the synergy of the integrated energy system based on multiple energy storage systems according to any one of claims 1 to 7, characterized in that: It also includes the steps of analyzing the impact of multiple energy storage systems with different rated powers on the synergy of the integrated energy system, and verifies the role of multiple energy storage systems in improving the synergy of the integrated energy system by calculating the minimum value of the comprehensive evaluation index.

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