Energy storage system and regulation and control method of energy storage system

Abstract

The invention relates to an energy storage system and a regulation and control method of the energy storage system, and the energy storage system comprises a steam supply main path which is connected with a boiler assembly; the heat supply network water supply loop is connected with a heat supply network; the heat storage unit is connected with the steam supply main path, so that the steam supply main path can exchange heat with the heat storage unit; the power supply circuit is at least used for being connected with a power grid, connected with the heat storage unit and capable of heating the heat storage unit; the first heat exchanger is connected with the heat storage unit and the heat supply network water supply loop and can enable the heat supply network water supply loop and the heat storage unit to exchange heat; the deoxygenated water branch is used for being connected with a steam pipe network; and the second heat exchanger is connected with the heat storage unit and the deoxygenated water branch and can enable the deoxygenated water branch and the heat storage unit to exchange heat. The adjusting capacity of the heat storage system is improved, heat loads and electric loads are decoupled, the independence of thermoelectric supply is improved, the heat supply capacity can be flexibly adjusted, energy waste is reduced, and economical efficiency is improved.

Description

Technical Field

[0001] This disclosure relates to the field of power regulation technology, and more specifically, to an energy storage system and a regulation method for the energy storage system. Background Technology

[0002] Existing combined heat and power (CHP) units have high overall thermal efficiency, but their heat and power supply independence is poor. The unit's power generation is constrained by changes in heat load, presenting a "heat and power decoupling" problem. Therefore, modifications are typically made to the units to improve the independence of heat and power supply. However, existing CHP unit modifications usually involve modifications to the main equipment itself, such as bypassing the turbine for heating, cutting off the low-pressure cylinder intake, modifying the high back pressure system, modifying the heat pump for waste heat recovery, or adding energy storage devices such as electrode furnaces and thermal storage tanks. With modifications to the main equipment, low-load operation can cause desulfurization and denitrification equipment to deviate from design specifications, leading to problems such as excessive emissions. Adding electrode furnaces only internally absorbs the electrical load and converts it into heat energy, resulting in a waste of overall efficiency. Thermal storage tanks have the problem of low energy density and large footprint. Therefore, while these modification methods have some peak-shaving capabilities, they are limited by the minimum load safety operation of boilers and turbines, and cannot achieve deep and flexible peak-shaving. Summary of the Invention

[0003] The purpose of this disclosure is to provide an energy storage system and a method for regulating the energy storage system, so as to regulate the energy of the power grid and boiler, reduce energy waste, help thermal power units to "decouple heat and electricity", and improve system flexibility.

[0004] To achieve the above objectives, this disclosure provides an energy storage system, comprising: A main steam supply line, on which a boiler assembly is connected; The heating network water supply circuit is used to connect to the heating network; The heat storage unit is connected to the main steam supply line, enabling the main steam supply line to exchange heat with the heat storage unit; A power supply line, used to connect to the power grid, is connected to the thermal storage unit and is capable of heating the thermal storage unit; and The first heat exchanger is connected to both the heat storage unit and the heating network water supply circuit, enabling the heating network water supply circuit and the heat storage unit to exchange heat.

[0005] Deoxygenated water branch line, used to connect to the steam pipeline network; The second heat exchanger is connected to both the heat storage unit and the deoxygenated water branch, enabling the deoxygenated water branch to exchange heat with the heat storage unit.

[0006] Optionally, the thermal storage unit includes: The first heat storage element is connected to the main steam supply line; A second heat storage element is connected to the power supply line, and the power supply line is capable of heating the second heat storage element; and The heat exchange pipeline contains gas, and is equipped with a first heat storage element, a second heat storage element, a first heat exchanger, and a second heat exchanger. The heat exchange pipeline is capable of exchanging heat with the heating network water supply circuit and the main steam supply circuit.

[0007] Optionally, the heat exchange pipeline includes: The circulation section, the second heat storage element, and the first heat exchanger are disposed on the circulation section; and The first branch is connected to the circulation section, and the two connection points of the first branch and the circulation section are respectively located on both sides of the second heat storage element. The first heat storage element is disposed on the first branch.

[0008] Optionally, a check valve is provided on the first branch, and the check valve is located at the air outlet end of the first heat storage element.

[0009] Optionally, the heat exchange pipeline further includes an air supply section connected to the circulation section. The air supply section is used to connect to an external air source. The air supply section is located at the outlet end of the first heat exchanger and at the inlet end of the first heat storage element and the second heat storage element. A fan is also provided on the circulation section, and the air supply section is located at the inlet end of the fan.

[0010] Optionally, a first flow control valve is provided on the circulation section and the first branch section respectively, and the first flow control valve is respectively located at the air inlet end of the first heat storage element and the second heat storage element.

[0011] Optionally, the boiler assembly includes: The main steam circuit includes a boiler, a steam turbine, and a deaerator arranged sequentially on the main steam circuit, with one end of the main steam supply line connected to the deaerator. The main steam branch has one end connected to the main steam circuit and located between the boiler's outlet and the turbine's inlet, and the other end connected to the main steam supply line; and The steam branch of the steam turbine is connected at one end to the reheat steam outlet of the steam turbine or the steam outlet of the intermediate pressure cylinder of the steam turbine, and at the other end to the main steam supply line.

[0012] Optionally, a second flow control valve is provided on the main steam supply line, the main steam branch line, and the steam turbine branch line.

[0013] Optionally, a first steam supply branch is also connected to the main steam supply line, which is used to connect to the steam pipeline network.

[0014] According to another aspect of this disclosure, a method for regulating an energy storage system is provided, using the aforementioned energy storage system, the method comprising: When the load on the power grid is lower than the first threshold a, the power supply line is controlled to heat the thermal storage unit, and the thermal storage unit is selectively controlled to exchange heat with the boiler assembly. When the load on the power grid is not lower than the first threshold a and the load on the boiler assembly is lower than the second threshold b, the heat storage unit is controlled to exchange heat with the boiler assembly.

[0015] Optionally, the regulation method includes: When the load on the power grid exceeds the third threshold c, the heat storage unit is controlled to exchange heat with the heating network water supply circuit or the deoxygenated water branch.

[0016] The above technical solution allows for the selection of whether the main steam supply line and power supply line should use the thermal storage unit for heat storage, and whether the thermal storage unit should supply heat externally through the first and second heat exchangers, based on the grid load and heating network load. The thermal storage unit can store heat when the heat load of users is low, convert electrical energy into heat energy for storage when there is power curtailment on the grid, and release the stored heat through the first heat exchanger when the heat load of users is high, thereby reducing the load on the grid and boiler components. This improves the regulation capability of the thermal storage system, decouples the heat load and electrical load, and enhances the independence of heat and power supply. The thermal storage unit can flexibly adjust its heating capacity according to the size of the heat load and electrical load, reducing energy waste and improving economic efficiency.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of an energy storage system according to one embodiment of the present disclosure.

[0019] Explanation of reference numerals in the attached figures 1-Main steam supply line; 10-Boiler assembly; 11-Main steam circuit; 111-Boiler; 112-Steam turbine; 113-Deaerator; 114-Generator; 115-Condenser; 116-Condensate pump; 117-Cryogenic heater; 12-Main steam branch; 13-Steam turbine steam branch; 14-Second flow control valve; 15-First steam supply branch; 16-Deaerator water branch; 2-Heating network water supply circuit; 20-Heating network; 3-Heat storage unit; 31-First heat storage component; 32-Second heat storage component; 331-Circulation section; 332-First branch; 333-Check valve; 334-Steam supply section; 335-Fan; 336-First flow control valve; 337-Second branch; 4-Power supply line; 40-Power grid; 5-First heat exchanger; 6-Steam pipeline network; 7-Second heat exchanger. Detailed Implementation

[0020] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0021] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" are defined in relation to the actual arrangement direction of the energy storage system during use, and terms such as "first" and "second" are used to distinguish different components and do not imply sequence or importance. Furthermore, in the following description, when referring to accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0022] According to one embodiment of this disclosure, such as Figure 1 As shown, an energy storage system is provided, including a main steam supply line 1, a heating network water supply circuit 2, a thermal storage unit 3, a power supply line 4, and a first heat exchanger 5. A boiler assembly 10 can be connected to the main steam supply line 1. The heating network water supply circuit 2 can be used to connect to a heating network 20. The thermal storage unit 3 can be connected to the main steam supply line 1, enabling heat exchange between the main steam supply line 1 and the thermal storage unit 3. The power supply line 4 is at least used to connect to the power grid 40, and the power supply line 4 is also connected to the thermal storage unit 3, enabling heating of the thermal storage unit 3. The first heat exchanger 5 can be connected to both the thermal storage unit 3 and the heating network water supply circuit 2, enabling heat exchange between the heating network water supply circuit 2 and the thermal storage unit 3. A deoxygenated water branch line 16 is used to connect to a steam network 6. A second heat exchanger 7 can be connected to both the thermal storage unit 3 and the deoxygenated water branch line 16, enabling heat exchange between the deoxygenated water branch line 16 and the thermal storage unit 3.

[0023] The above technical solution allows for selection based on the grid load and heating network load: whether the main steam supply line 1 and power supply line 4 store heat through the heat storage unit 3, and whether the heat storage unit 3 supplies heat externally through the first heat exchanger 5 and the second heat exchanger 7. The heat storage unit 3 can store heat when the heat load of the users is low, convert electrical energy into heat energy for storage when there is power wastage on the grid 40, and release the stored heat through the first heat exchanger 5 when the heat load of the users is high, thereby reducing the load on the grid 40 and the boiler assembly 10. This improves the regulation capability of the heat storage system, decouples the heat load and electrical load, and enhances the independence of heat and power supply. The heat storage unit 3 can flexibly adjust its heating capacity according to the size of the heat load and electrical load, reducing energy waste and improving economic efficiency.

[0024] It should be noted that power supply line 4 can be used to connect to power grid 40, and the power source of power grid 40 can be at least one of the following: solar thermal power generation unit, photovoltaic power generation unit, and wind power generation unit. Thus, when power grid 40 generates surplus power—that is, when any of the solar thermal power generation unit, photovoltaic power generation unit, or wind power generation unit generates excess electricity—it can heat the thermal storage unit 3, promoting the utilization and absorption of renewable green electricity resources such as wind and solar power, achieving the purpose of energy recovery. Furthermore, in areas with large peak-valley electricity differences, electricity can also be purchased from power grid 40 to heat the thermal storage unit 3 during off-peak hours at night; this disclosure does not limit this.

[0025] Furthermore, such as Figure 1 As shown, the heat storage unit 3 may include a first heat storage element 31, a second heat storage element 32, and heat exchange pipelines. The first heat storage element 31 can be connected to the main steam supply line 1, and the second heat storage element 32 can be connected to the power supply line 4, which can heat the second heat storage element 32. Gas flows through the heat exchange pipelines, which are respectively equipped with the first heat storage element 31, the second heat storage element 32, a first heat exchanger 5, and a second heat exchanger 7. The gaseous heat exchange medium in the heat exchange pipelines can exchange heat with the heat storage materials in the heating network water supply circuit 2 and the first and second heat storage elements 31 and 32. In this way, the heat from the main steam supply line 1 and the electricity from the power supply line 4 can be stored by different modules. When the heat storage unit 3 needs to supply heat to the heating network water supply circuit 2 through the first heat exchanger 5, it can freely choose to supply heat together or one of the first heat storage unit 31 and the second heat storage unit 32 according to the temperature of the first heat storage unit 31 and the second heat storage unit 32. This can be controlled by installing a flow valve or a connecting valve. The specific implementation method will be described below.

[0026] It should be noted that the first heat storage element 31 can be a rock bed, a molten salt tank, or a solid structure made of carbon-based materials, so that the heat storage temperature range can be 200-1200℃. This disclosure does not limit this. The second heat storage element 32 can be multiple stacked high-temperature resistant solid materials. The solid materials can be magnesia bricks made of magnesia or carbon-based materials, and heating wires are set in the solid materials. The power supply line 4 is connected to the heating wires and heats the heating wires to raise the temperature of the connected solid materials. The gas in the heat exchange pipeline can be nitrogen or other inert gases. This disclosure does not limit this.

[0027] Furthermore, such as Figure 1 As shown, the heat exchange pipeline may include a circulation section 331 and a first branch section 332. A second heat storage element 32 and a first heat exchanger 5 may be disposed on the circulation section 331. The first branch section 332 may be connected to the circulation section 331 in parallel, and the two connection points between the first branch section 332 and the circulation section 331 are located on opposite sides of the second heat storage element 32. The first heat storage element 31 is disposed on the first branch section 332. When the heat storage unit 3 needs to supply heat to the heating network water supply circuit 2 through the first heat exchanger 5, it is possible to freely choose to connect only the first branch 332 according to the temperature of the first heat storage element 31 and the second heat storage element 32, so that the part of the circulation section 331 connected to the first heat exchanger 5 and the first branch 332 form a loop, and the gas does not flow through the part connected to the second heat storage element 32, and only the first heat storage element 31 provides heat. Alternatively, it is possible to choose not to connect the first branch 332, and the gas flows in the circulation section 331, and only the second heat storage element 32 provides heat. Or, both the circulation section 331 and the first branch 332 can be connected, and the first heat storage element 31 and the second heat storage element 32 provide heat together. This disclosure does not limit this. Here, a check valve 333 can be installed on the first branch 332, and the check valve 333 is located at the gas outlet end of the first heat storage element 31. To prevent gas flowing out of the second heat storage element 32 from flowing through the first branch section 332 to the position of the first heat storage element 31, thereby affecting the heat exchange between the heat exchange pipeline and the heating network water supply circuit 2, a first flow control valve 336 may also be provided on the circulation section 331 and the first branch section 332 respectively. The first flow control valve 336 is respectively located at the air inlet end of the first heat storage element 31 and the second heat storage element 32 to control the gas flow rate through the first heat storage element 31 and the second heat storage element 32. The opening and closing of the two first flow control valves 336 can select whether the first heat storage element 31 or the second heat storage element 32 provides heat, or when both are selected to provide heat, the participation of the first heat storage element 31 and the second heat storage element 32 can be adjusted by adjusting the opening of the two first flow control valves 336. This disclosure does not limit this.

[0028] According to one embodiment of this disclosure, such as Figure 1As shown, the heat exchange pipeline may further include a gas supply section 334 connected to the circulation section 331. The gas supply section 334 is used to connect to an external gas source. The gas supply section 334 may be located at the outlet end of the first heat exchanger 5 and at the inlet end of the first heat storage element 31 and the second heat storage element 32. A fan 335 is also provided on the circulation section 331, and the gas supply section 334 is located at the inlet end of the fan 335. The gas supply section 334 can replenish gas to the circulation section 331 and the first branch section 332 when gas loss occurs in the heat exchange pipeline. The fan 335 can accelerate the gas flow in the heat exchange pipeline to improve the heating efficiency of the heating network water supply circuit 2. During peak electricity consumption periods, the fan 335 can be turned on. The fan 335 controls the gas flow rate entering the heat storage unit 3 according to the flow rate requirement through the first flow control valve 336. The cold air exchanges heat through the heat storage unit 3, and the hot air generated after heat exchange exchanges heat with the heating network water supply circuit 2 through the first heat exchanger 5, and is pumped into the heating network 20 by the circulating water pump.

[0029] According to one embodiment of this disclosure, such as Figure 1 As shown, the boiler assembly 10 may include a main steam circuit 11, a main steam branch 12, and a turbine steam branch 13. The main steam circuit 11 is sequentially equipped with a boiler 111, a turbine 112, and a deaerator 113. A coaxially rotating generator 114 can also be connected to the turbine 112 for power generation. The generator 114 can be connected to the power grid 40 to transmit electricity. One end of the main steam supply line 1 is connected to the deaerator 113. One end of the main steam branch 12 is connected to the main steam circuit 11 and is located between the outlet of the boiler 111 and the inlet of the turbine 112; the other end is connected to the main steam supply line 1. One end of the turbine steam branch 13 is connected to the reheat steam outlet of the turbine 112 or the intermediate-pressure cylinder steam outlet of the turbine 112; the other end is connected to the main steam supply line 1. In this way, the main steam supply line 1 can select to supply heat to the thermal storage unit 3 through the main steam of boiler 111, the intermediate-pressure cylinder outlet steam of turbine 112, or reheat steam, according to actual conditions, so as to improve the steam utilization efficiency without affecting the power generation capacity of boiler assembly 10. In addition, condenser 115, condensate pump 116, and cryogenic heater 117 can also be connected in sequence between turbine 112 and deaerator 113.

[0030] Furthermore, such as Figure 1As shown, a second flow control valve 14 is installed on the main steam supply line 1, the main steam branch line 12, and the turbine steam branch line 13. The second flow control valve 14 on the main steam supply line 1 can be used to control the steam flow rate that exchanges heat with the heat storage unit 3. The second flow control valve 14 on the main steam branch line 12 can control the steam flow rate drawn from the main steam circuit 11, so as to ensure sufficient steam supply to the boiler 111 and the turbine 112, while using the excess steam to exchange heat with the heat storage unit 3. The second flow control valve 14 on the turbine steam branch line 13 can control the steam flow rate drawn from the reheat steam outlet of the turbine 112 or the intermediate pressure cylinder steam outlet of the turbine 112, so as to reduce the steam extraction from the main steam circuit 11 to a certain extent, thereby improving the power generation capacity of the generator 114 coaxially connected to the turbine 112.

[0031] According to one embodiment of this disclosure, such as Figure 1 As shown, a first steam supply branch 15 can also be connected to the main steam supply line 1. The first steam supply branch 15 is used to connect to the steam pipeline network 6. A second flow control valve 14 can also be installed on the first steam supply branch 15 to regulate the steam flow in the first steam supply branch 15.

[0032] In addition, regarding the specific connection method of the deoxygenated water branch 16, the deoxygenated water branch 16 can also be connected to the steam inlet side of the main steam circuit 11 located in the boiler 111. The heat exchange pipeline can also include a second branch 337 connected to the circulation section 331. A first flow control valve 336 can also be installed on the second branch 337 to control the gas flow on the second branch 337. The two connection points between the second branch 337 and the circulation section 331 are located on both sides of the second heat storage element 32. The second heat exchanger 7 is provided with the second branch 337, and the deoxygenated water branch 16 is connected to the second heat exchanger 7. The deoxygenated water branch 16 can exchange heat with the second branch 337 through the second heat exchanger 7. While meeting the surrounding industrial steam demand, it can reduce the steam supply of the first steam supply branch 15 to the steam network 6, reduce the loss of high-temperature steam in the main steam circuit 11, and improve the power generation capacity.

[0033] Based on the above scheme, this disclosure also provides a control method for an energy storage system. Using the aforementioned energy storage system, the control method includes controlling the power supply line 4 to heat the thermal storage unit 3 when the load on the power grid 40 is below a first threshold a, i.e., when the power grid 40 is in a low-peak electricity consumption period, and selectively controlling the thermal storage unit 3 to exchange heat with the boiler assembly 10. The power supply line can be sourced from renewable energy curtailment or off-peak power from the power grid; this disclosure does not limit this. That is, at this time, steam from the boiler assembly 10 can be extracted to store heat in the thermal storage unit 3, or the steam from the boiler assembly 10 can be used only for power generation and direct heating of the heating network 20. A thermal storage threshold can be set. When the heat accumulated by the thermal storage unit 3 from curtailed power from the power grid 40 reaches the thermal storage threshold within a certain time, the steam from the boiler assembly 10 is used only for power generation and direct heating of the heating network 20. When the heat accumulated by the thermal storage unit 3 from curtailed power from the power grid 40 does not reach the thermal storage threshold within a certain time, a portion of the steam from the boiler assembly 10 can be extracted to exchange heat with the thermal storage unit 3 to supplement the thermal storage. The control method may also include controlling the heat storage unit 3 to exchange heat with the boiler assembly 10 when the load of the power grid 40 is not lower than the first threshold a and the load of the boiler assembly 10 is lower than the second threshold b, that is, when the load of the boiler assembly 10 is at its low peak. In other words, at this time, the power grid 40 does not generate power waste, but only stores heat by exchanging heat with the heat storage unit 3 through the first heat exchanger 5 using steam extracted from the boiler assembly 10.

[0034] Furthermore, the control method can also include controlling the heat storage unit 3 to exchange heat with the heating network water supply circuit 2 or the deoxygenated water branch 16 when the load of the power grid 40 exceeds the third threshold c, i.e., when the power grid 40 is in the peak electricity consumption stage. In this way, the steam supply of the boiler assembly 10 to the heating network can be reduced, and the missing heat can be made up by the heat storage unit 3 releasing heat stored during the off-peak electricity consumption period. This solves the heating problem while reducing the power generation load, and at the same time shuts down or reduces the heat supply of the main steam supply line 1, so that all the steam generated by the boiler assembly 10 is used to do work to meet the grid requirements, realizes the decoupling of heat and power in the cogeneration plant, ensures the continuous and stable operation of the cogeneration unit, and promotes the consumption of new energy. At the same time, since the heat storage unit 3 can also exchange heat with the deoxygenated water branch 16, the industrial steam generated by the steam in the deoxygenated water branch 16 exchanging heat with the heat storage unit 3 through the second heat exchanger 7 can be input into the steam pipeline network 6, which can meet the industrial steam demand, thereby reducing the extraction of steam from the thermal power unit and increasing the power generation capacity.

[0035] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0036] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0037] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An energy storage system, characterized in that, include: A main steam supply line, on which a boiler assembly is connected; The heating network water supply circuit is used to connect to the heating network; The heat storage unit is connected to the main steam supply line, enabling the main steam supply line to exchange heat with the heat storage unit; A power supply line is used to connect to the power grid. The power supply line is connected to the thermal storage unit and can heat the thermal storage unit. The first heat exchanger is connected to the heat storage unit and the heating network water supply circuit respectively, enabling the heating network water supply circuit and the heat storage unit to exchange heat. and Deoxygenated water branch line, used to connect to the steam pipeline network; The second heat exchanger is connected to both the heat storage unit and the deoxygenated water branch, enabling the deoxygenated water branch to exchange heat with the heat storage unit.

2. The energy storage system according to claim 1, characterized in that, The thermal storage unit includes: The first heat storage element is connected to the main steam supply line; A second heat storage element is connected to the power supply line, which is capable of heating the second heat storage element; and The heat exchange pipeline contains gas, and is equipped with a first heat storage element, a second heat storage element, a first heat exchanger, and a second heat exchanger. The heat exchange pipeline is capable of exchanging heat with the heating network water supply circuit and the main steam supply circuit.

3. The energy storage system according to claim 2, characterized in that, The heat exchange pipeline includes: The circulation section, the second heat storage element, and the first heat exchanger are disposed on the circulation section; and The first branch is connected to the circulation section, and the two connection points of the first branch and the circulation section are respectively located on both sides of the second heat storage element. The first heat storage element is disposed on the first branch.

4. The energy storage system according to claim 3, characterized in that, A check valve is provided on the first section, and the check valve is located at the gas outlet end of the first heat storage element.

5. The energy storage system according to claim 3, characterized in that, The heat exchange pipeline also includes a gas supply section connected to the circulation section. The gas supply section is used to connect to an external gas source. The gas supply section is located at the outlet end of the first heat exchanger and at the inlet end of the first heat storage element and the second heat storage element. A fan is also provided on the circulation section, and the gas supply section is located at the inlet end of the fan.

6. The energy storage system according to claim 3, characterized in that, The circulation section and the first branch section are respectively provided with a first flow control valve, which is respectively located at the air inlet end of the first heat storage element and the second heat storage element.

7. The energy storage system according to claim 1, characterized in that, The boiler assembly includes: The main steam circuit includes a boiler, a steam turbine, and a deaerator arranged sequentially on the main steam circuit, with one end of the main steam supply line connected to the deaerator. The main steam branch has one end connected to the main steam circuit and located between the boiler's outlet and the turbine's inlet, and the other end connected to the main steam supply line; and The steam branch of the steam turbine is connected at one end to the reheat steam outlet of the steam turbine or the steam outlet of the intermediate pressure cylinder of the steam turbine, and at the other end to the main steam supply line.

8. The energy storage system according to claim 7, characterized in that, A second flow control valve is installed on the main steam supply line, the main steam branch line, and the steam turbine branch line.

9. The energy storage system according to claim 1, characterized in that, The main steam supply line is also connected to a first steam supply branch line, which is used to connect to the steam pipeline network.

10. A method for regulating an energy storage system, characterized in that, Using the energy storage system according to any one of claims 1-9, the control method includes: When the load on the power grid is lower than the first threshold a, the power supply line is controlled to heat the thermal storage unit, and the thermal storage unit is selectively controlled to exchange heat with the boiler assembly. When the load on the power grid is not lower than the first threshold a and the load on the boiler assembly is lower than the second threshold b, the heat storage unit is controlled to exchange heat with the boiler assembly.

11. The control method for an energy storage system according to claim 10, characterized in that, The control method includes: When the load on the power grid exceeds the third threshold c, the heat storage unit is controlled to exchange heat with the heating network water supply circuit or the deoxygenated water branch.

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