A thermal power flexibility multi-source coordinated active balance process system

Abstract

The present application relates to a kind of thermal power flexibility multi-source coordination " active balance " process systems, comprising: flywheel energy storage frequency modulation system, molten salt energy storage frequency modulation system and thermal power flexibility " active balance " process monitoring control system;Flywheel energy storage frequency modulation system is connected with unit plant 6kV bus;Molten salt energy storage frequency modulation system includes molten salt electric heating device, molten salt energy storage device and water-molten salt-steam inverse heat transfer system;Molten salt electric heating device is connected with power plant switch factory bus, and is connected with molten salt energy storage device and water-molten salt-steam inverse heat transfer system respectively by pipeline;Thermal power flexibility " active balance " process monitoring control system is used to control flywheel energy storage frequency modulation system and molten salt energy storage frequency modulation system, realizes the " active balance " service of thermal power unit or power system.The present application can be widely applied in thermal power flexibility reconstruction " active balance " service technical field.

Description

Technical Field

[0001] This invention relates to an active power balancing process system, and more particularly to a multi-source coordinated active power balancing process system for thermal power plants with flexibility, belonging to the technical fields of flywheel energy storage, molten salt energy storage, thermal power plant flexibility retrofitting and manufacturing, regulating power sources, and power system "rotational inertia, frequency regulation, peak shaving, and ramp-up active power balancing services". Background Technology

[0002] According to China's power development plan, by 2030, the total installed capacity of renewable energy sources, including wind and solar power, will reach over 1.2 billion kilowatts, and by 2035 it will reach 1.35 billion kilowatts. New energy sources, represented by wind and solar power, will gradually become my country's main power source. The rapid development of new energy power requires a huge capacity of active power balancing and regulation power sources. It is estimated that by 2025, the national power system's regulation capacity gap will reach 200 million kilowatts. However, the power system's regulation capacity is declining continuously with the increase in the proportion of new energy sources, and the active power balancing and regulation capacity of thermal power units is also declining year by year with the decreasing generation load rate, highlighting its inadequacy.

[0003] The National Development and Reform Commission and the National Energy Administration, in their document No. 1519 of 2021, "Implementation Plan for the Upgrading and Transformation of Thermal Power Units Nationwide," require: carrying out heating transformation of thermal power units and optimizing the operation of existing combined heat and power (CHP) units. They encourage technological upgrades to CHP units to further improve heating capacity and meet increased heat load demands. The plan also calls for continued implementation of flexible manufacturing and transformation of thermal power units, comprehensively considering technical feasibility, economics, and operational safety. After flexible transformation, the minimum power output of existing thermal power units should reach approximately 30% of the rated load. The plan also emphasizes accelerating the implementation of flexible manufacturing and transformation of thermal power units, ensuring that all existing thermal power units undergo flexible transformation. The general requirement for peak-shaving capacity under pure condensing conditions is a minimum power output of 35% of the rated load. Heating CHP units should strive to achieve a peak-shaving capacity of 40% of the rated load per 6 hours during the heating season through heat and power decoupling.

[0004] Currently, there are no reports of large-scale, safe, reliable, and economically viable mature solutions for flexible manufacturing and retrofitting of thermal power units.

[0005] The power grid frequency essentially reflects the balance between power generation and load in a power system and is one of the important indicators of power system operation quality and safety. Thermal power units participate in active frequency regulation mainly by relying on their own primary frequency regulation performance and secondary frequency regulation through automatic generation control (AGC). AGC regulates the active power of thermal power units to achieve the goal of power grid frequency regulation. However, due to the high thermal inertia of coal-fired power units, traditional thermal power units suffer from problems such as adjustment delays, slow ramp-up speeds, and low adjustment accuracy when responding to AGC frequency regulation commands. Furthermore, they cannot meet the power grid AGC regulation standard requirements when the boiler load is less than the stable combustion load. Moreover, when the minimum power generation output of a thermal power unit is lower than the boiler's stable combustion load, its primary frequency regulation capability approaches zero, making it difficult to meet the relevant specifications for safe and stable operation of the power grid.

[0006] According to Polaris Energy Storage Network, as of July 2020, my country had a total of 58 coal-fired power plant energy storage combined frequency regulation projects that were in operation, under construction, or won bids. In the past three years, most energy storage projects assisting coal-fired power units in AGC frequency regulation have adopted lithium iron phosphate battery energy storage technology. However, this technology has the following main problems in assisting coal-fired power unit AGC frequency regulation:

[0007] a) Thermal runaway: The electrolytes of lithium-ion batteries are mostly organic solvents, mainly composed of carbonates, with low flash points and boiling points, making them prone to oxidation reactions. Leaks can easily lead to dangerous accidents such as battery fires. During the manufacturing process, lithium-ion batteries inevitably contain some dust and other impurities, which can damage the separator, causing internal short circuits and safety accidents. In fact, large-scale, long-term lithium-ion battery energy storage systems all have the inherent risk of thermal runaway and subsequent combustion / explosion. Current fire control and firefighting measures for lithium-ion battery energy storage systems are not effective in preventing further deterioration after a deflagration. To date, due to the inherent characteristics of lithium-ion batteries, lithium-ion battery energy storage systems used in conjunction with thermal power units for frequency regulation still lack inherent safety, and the thermal safety issues of lithium-ion batteries in the application of frequency regulation in combined thermal power and energy storage units have not been fundamentally resolved.

[0008] b) Not participating in the primary frequency regulation of the power grid;

[0009] c) Insufficient frequency regulation energy: Although lithium battery energy storage can perform fast charging and discharging to assist the AGC frequency regulation of thermal power units, it lacks the ability to continuously track AGC frequency regulation commands when the AGC regulation power changes over a wide range.

[0010] d) Does not participate in the frequency regulation accuracy adjustment of thermal power unit AGC;

[0011] e) Short service life;

[0012] f) It is difficult to achieve unattended operation. Summary of the Invention

[0013] To address the aforementioned problems, the purpose of this invention is to provide a flexible multi-source coordinated active power balancing process system for thermal power plants, which can achieve multi-source coordinated "active power balancing" service.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] A flexible multi-source coordinated active power balancing service process system for thermal power plants, comprising:

[0016] Flywheel energy storage frequency regulation system, molten salt energy storage frequency regulation system, and thermal power flexible "active power balance" process control system;

[0017] The flywheel energy storage frequency regulation system is connected to the 6KV busbar (11) of the thermal power unit.

[0018] The molten salt energy storage frequency regulation system includes a molten salt electric heating device, a molten salt energy storage device, and a water-molten salt-steam reverse heat exchange system containing a "water-molten salt-steam reverse heat exchange device";

[0019] The power source for the molten salt electric heating device is taken from the power plant switch bus (03). The molten salt electric heating device is connected to the molten salt energy storage device through the molten salt electric heating device cold salt supply pipeline (38) and the molten salt electric heating device hot salt return pipeline (46); and is connected to the "water-molten salt-steam inverted heat exchanger" (47) through the molten salt electric heating device hot salt supply pipeline (49).

[0020] The salt-side pipeline of the "water-molten salt-steam reverse heat exchange device" (47) is connected to the molten salt energy storage device through the cold salt supply pipeline (39) of the "water-molten salt-steam reverse heat exchange device", and is connected to the molten salt electric heating device through the hot salt supply pipeline (49) of the molten salt electric heating device. After secondary heating by the molten salt electric heating device, it is connected to the molten salt energy storage device through the hot salt supply pipeline (50) of the molten salt electric heating device.

[0021] The thermal power plant flexibility "active power balance" process control system is used to monitor and control the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system to achieve "active power balance service" for the unit or the power grid.

[0022] Furthermore, the flywheel energy storage frequency regulation system includes several flywheel energy storage frequency regulation units connected in parallel. Each flywheel energy storage frequency regulation unit is connected in parallel to the flywheel energy storage frequency regulation system bus (14) via the flywheel energy storage frequency regulation unit transformer (16), and is connected to the 6kV bus (11) of the thermal power unit via the flywheel energy storage frequency regulation system bus disconnect switch (15).

[0023] Each of the aforementioned flywheel energy storage frequency regulation units contains at least one set of flywheel energy storage device array inverters PCS (23). Each of the aforementioned flywheel energy storage device array inverters PCS (23) is connected to the flywheel energy storage frequency regulation unit bus (21) through the flywheel energy storage device array inverter AC isolation switch. The flywheel energy storage frequency regulation unit bus (21) is connected to the flywheel energy storage frequency regulation unit transformer (16) through the flywheel energy storage frequency regulation unit isolation switch (20).

[0024] Furthermore, each of the flywheel energy storage device array inverters (PCS) (23) is connected to at least one flywheel energy storage device module via the flywheel energy storage device array bus (22); each flywheel energy storage device module consists of a flywheel energy storage array management system (FMS) (24) and several flywheel energy storage device modules, and each flywheel energy storage device module is connected to the flywheel energy storage device array bus (22) via a flywheel energy storage device converter DC switch. The flywheel energy storage device array inverters (PCS) (23) control the corresponding flywheel energy storage array management system (FMS) (24), the flywheel energy storage array management system (FMS) (24) controls the corresponding flywheel energy storage device converter (FCS) (25), and each flywheel energy storage device converter (FCS) (25) controls one flywheel energy storage device (26).

[0025] Furthermore, the molten salt electric heating device is equipped with a molten salt electric heating device power supply system and a molten salt electric heater (27).

[0026] The power supply system of the molten salt electric heating device includes a power plant switch plant bus power supply isolation switch (28), a molten salt electric heating device power supply transformer (07), a molten salt electric heating device power supply transformer power supply isolation switch (29), and a molten salt electric heater power supply isolation switch (30) connected in sequence, and the other side of the molten salt electric heater power supply isolation switch (30) is connected to the molten salt electric heater (07).

[0027] The molten salt electric heater (07) is connected to the molten salt energy storage device via the cold salt supply pipeline (38) of the molten salt electric heating device, and a cold salt supply isolation door (35) is provided on the cold salt supply pipeline (38) of the molten salt electric heating device; the molten salt electric heater (07) is connected to the "water-molten salt-steam reverse heat exchange device" (47) via the hot salt supply pipeline (49) of the molten salt electric heating device, and a "water-molten salt-steam reverse heat exchange device" hot salt supply isolation door (51) is provided on the hot salt supply pipeline (49) of the molten salt electric heating device; the molten salt electric heater (07) is connected to the molten salt energy storage device via the hot salt supply pipeline (50) of the molten salt electric heating device.

[0028] Furthermore, the molten salt energy storage device includes a cold salt tank (31) and a hot salt tank (32).

[0029] The cold salt tank (31) is connected to the molten salt electric heating device and the "water-molten salt-steam reverse heat exchange device" (47) through the cold salt tank supply pipeline (42), and the cold salt tank supply pipeline (42) is equipped with a cold salt pump (33) and a cold salt pump supply valve (34); the cold salt tank (31) is also connected to the "water-molten salt-steam reverse heat exchange device" (47) through the "water-molten salt-steam reverse heat exchange device" return salt pipeline (40), and the "water-molten salt-steam reverse heat exchange device" cold salt return salt isolation valve (37) is installed on the "water-molten salt-steam reverse heat exchange device" return salt pipeline (40);

[0030] The hot salt tank (32) is connected to the salt supply pipeline (50) of the molten salt electric heating device and the "water-molten salt-steam reverse heat exchange device" (47) via the hot salt pump (43) and the hot salt pump outlet salt supply valve (44).

[0031] Furthermore, the water-molten salt-steam reverse heat exchange system includes a "water-molten salt-steam reverse heat exchange device" (47), a molten salt thermal storage auxiliary peak shaving system, and a molten salt heat release auxiliary peak shaving system;

[0032] The molten salt thermal storage auxiliary peak-shaving system includes a bypass turbine main steam pressure reduction and supply system, a bypass turbine reheat steam supply system, a steam desuperheating supply system for plant / industrial steam, and a condensate drainage system for the "water-molten salt-steam inverted heat exchange device".

[0033] The molten salt heat release auxiliary peak shaving system includes a high-pressure feedwater system for the "water-molten salt-steam reverse heat exchange device", an auxiliary main steam supply system, a molten salt heat release supply system for plant / industrial steam, and a low-pressure feedwater system for the "water-molten salt-steam reverse heat exchange device".

[0034] The salt-side pipeline of the "water-molten salt-steam reverse heat exchange device" is connected to the molten salt energy storage device and the molten salt electric heating device; the steam-side pipeline is connected to the bypass turbine main steam pressure reduction steam supply system, the bypass turbine reheat steam supply system, the steam desuperheating supply plant / industrial steam system, the auxiliary main steam supply system, and the molten salt heat release supply plant / industrial steam system; the water-side pipeline is connected to the high-pressure feedwater system, the low-pressure feedwater system, and the condensate drainage system of the "water-molten salt-steam reverse heat exchange device".

[0035] Furthermore, the "water-molten salt-steam reverse heat exchange device" has a built-in steam desuperheater, condenser, and condensate cooler connected in sequence to achieve forward molten salt heat absorption; and a feedwater preheater, steam generator, and steam superheater connected in sequence to achieve reverse heat release.

[0036] Furthermore, the high-pressure feedwater system of the "water-molten salt-steam reverse heat exchanger" includes a boiler feedwater pump deaerator feedwater pipeline (65) led out from the boiler feedwater deaerator (86) of the thermal power unit, a boiler feedwater pump (87), a boiler high-pressure feedwater pump outlet isolation valve (61), a steam turbine high-pressure heater feedwater system (58), a boiler high-pressure feedwater pipeline tee (95) of the "water-molten salt-steam reverse heat exchanger", a high-pressure feedwater pipeline (67) of the "water-molten salt-steam reverse heat exchanger" and a high-pressure feedwater inlet isolation valve (62) of the "water-molten salt-steam reverse heat exchanger" installed on it;

[0037] The low-pressure feedwater system of the "water-molten salt-steam reverse heat exchange device" includes the deaeration feedwater pipeline (66) of the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater pump (59), the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater pipeline (68) and the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater isolation valve (60) on the "water-molten salt-steam reverse heat exchange device" from the boiler feedwater deaerator (86) of the thermal power unit;

[0038] The drainage system of the "water-molten salt-steam reverse heat exchange device" includes the drainage pipeline (69) of the "water-molten salt-steam reverse heat exchange device" led out from the boiler feedwater deaerator (86) of the thermal power unit, as well as the drainage isolation valve (63) and drainage regulating valve (64) on it.

[0039] Furthermore, the bypass turbine main steam pressure reduction and steam supply system is connected to the turbine high-pressure bypass steam pipeline (99) via the turbine main steam pipeline (96) led out from the turbine high-pressure cylinder inlet regulating valve (57-1), the turbine main steam to high-pressure bypass steam pipeline tee (97), and the "water-molten salt-steam reverse heat exchange device" turbine high-pressure bypass steam supply pipeline (81) via the turbine high-pressure bypass valve inlet isolation valve (70), the turbine high-pressure bypass steam supply pipeline tee (91), and the "water-molten salt-steam reverse heat exchange device" turbine high-pressure bypass steam supply pipeline (81). The steam inlet header (79) is connected to the steam turbine high-pressure bypass steam supply pipeline (81) of the "water-molten salt-steam reverse heat exchange device". The pipeline is equipped with a high-pressure bypass steam supply isolation valve (56) and a bypass steam turbine main steam supply pressure regulating valve (74). The other end of the steam turbine high-pressure bypass steam supply pipeline tee (91) is connected to the steam turbine high-pressure bypass valve (54) and the high-pressure bypass valve outlet isolation valve (55). The other end of the steam turbine main steam pipeline (96) is connected to the boiler (52) via the steam turbine main steam to high-pressure bypass steam pipeline tee (97).

[0040] The bypass turbine reheat steam supply system is connected to the inlet header (79) of the "water-molten salt-steam inverted heat exchanger" via the turbine reheat hot section steam pipeline (98) led out from the boiler (52), the turbine low-pressure bypass valve inlet isolation valve (72), the turbine reheat hot section steam supply pipeline tee (93), and the bypass turbine reheat hot section steam supply pipeline (82). The bypass turbine reheat hot section steam supply pipeline (82) is equipped with a turbine reheat hot section bypass. The steam supply pipeline has a non-return valve (92) and a turbine reheat hot section bypass steam supply pipeline isolation valve (73). The turbine reheat hot section steam pipeline (98) is connected to the turbine low-pressure bypass valve (85) through the other side of the turbine reheat hot section steam supply pipeline tee (93). A turbine low-pressure bypass valve outlet isolation valve (75) and a connecting pipeline (100) are provided on the outlet side of the turbine low-pressure bypass valve (85). The turbine reheat hot section steam pipeline (98) is also connected to the turbine (53).

[0041] The steam desuperheating system for plant / industrial steam includes: a steam desuperheating pipeline (83) connected to the "water-molten salt-steam reverse heat exchange device" (47); the steam desuperheating pipeline (83) is connected to the molten salt heat release pipeline (84) and the plant / industrial steam pipeline via a tee (94) for molten salt heat release and steam desuperheating pipeline for plant / industrial steam; the molten salt heat release pipeline (84) is equipped with an isolation valve (76) for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam; and the plant / industrial steam pipeline is equipped with a non-return valve (78) for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam.

[0042] The auxiliary main steam supply system is led out from the steam outlet pipeline interface of the "water-molten salt-steam inverted heat exchange device" and passes through the auxiliary main steam supply pipeline (80) of the "water-molten salt-steam inverted heat exchange device" and its auxiliary main steam isolation valve (88), the auxiliary main steam inlet isolation valve (71) of the turbine high-pressure bypass pipeline, the tee (90) of the turbine high-pressure bypass auxiliary main steam inlet pipeline, the turbine high-pressure bypass steam pipeline (99), the turbine high-pressure bypass valve inlet isolation valve (70), and the turbine main steam pipeline (96) to enter the turbine high-pressure cylinder inlet regulating valve;

[0043] The molten salt heat release supply system for plant / industrial steam includes a molten salt heat release supply system for plant / industrial steam pipeline (84) connected to the "water-molten salt-steam inverse heat exchange device" (47) and an isolation door (76) for the "water-molten salt-steam inverse heat exchange device" for plant / industrial steam installed on it. The other end of the isolation door (76) for the "water-molten salt-steam inverse heat exchange device" for plant / industrial steam is connected to a tee (94) of the molten salt heat release and steam de-cooling supply system for plant / industrial steam.

[0044] Furthermore, the thermal power flexibility "active power balance" process monitoring and control system includes a grid dispatch center remote terminal control system RTU (01), a power plant PMU (05), a thermal power unit DCS (06), a thermal power flexibility "active power balance" process control system DCS (17), a flywheel energy storage frequency regulation energy management system EMU (18), and a molten salt energy storage frequency regulation control system DCS (19); the thermal power flexibility "active power balance" process control system DCS (17) is connected to the grid dispatch center remote terminal control system RTU (01), the thermal power unit DCS (06), the flywheel energy storage frequency regulation energy management system EMU (18), and the molten salt energy storage frequency regulation control system DCS (19), respectively; the power plant PMU (05) is connected to the grid dispatch center remote terminal control system RTU (01), the thermal power unit DCS (06), and the flywheel energy storage frequency regulation energy management system EMU (18).

[0045] The present invention has the following advantages due to the adoption of the above technical solutions:

[0046] (1) The use of a power-type flywheel energy storage frequency regulation system to replace the primary frequency regulation of the power grid and the auxiliary AGC frequency regulation of the power generation unit has good "active power balance" performance and high standards. The flywheel energy storage frequency regulation system has made a qualitative breakthrough compared with the electrochemical battery energy storage system for auxiliary AGC frequency regulation of power generation units in terms of inherent safety of equipment, power scale, operational controllability, and life cycle cost. Specifically, it is reflected in:

[0047] a) Charge / discharge operation rate ≥2C: Provides strong rotational inertia and primary frequency regulation active power balance capability for thermal power units and new energy units;

[0048] b) High control precision: The response precision of the grid AGC dispatch adjustment can be controlled within 0.5% of the unit's rated power or ±.5MW of the AGC command power;

[0049] c) Low life cycle cost: The operating life of the flywheel energy storage system is >20 years, which is the same as the life of the main equipment of the thermal power unit.

[0050] d) Facilitates intelligent management and control: It enables unmanned operation, precise control, intelligent management and control, and smart operation through data and networking.

[0051] (2) Applying electric heating molten salt and molten salt thermal storage as controllable load response to grid AGC dispatch, with a wide range of frequency regulation, peak regulation, ramping and "active power balance" adjustment.

[0052] Molten salt electric heating devices have rapid power regulation capabilities and can be used as controllable loads in conjunction with thermal power units for frequency regulation and peak shaving via AGC.

[0053] (3) The application of the “molten salt energy storage frequency regulation system” integrates the thermal power unit to absorb and release heat through molten salt, thereby reducing or increasing the steam supply of the unit as a controllable load to respond to the grid AGC dispatch. It has a large range of frequency regulation, peak regulation, ramping, and “active power balance” power regulation and good economic efficiency.

[0054] Molten salt has advantages such as a wide liquid temperature range, the molten salt remains in a liquid state throughout the entire process of heat storage and release, high convective heat transfer coefficient, low viscosity, and high operating temperature, as well as precise and adjustable heat release temperature.

[0055] (4) Applying flywheel energy storage, electric heating molten salt, molten salt heat storage, and "water-molten salt-steam inverse heat exchange device" to integrate the steam flow regulation of thermal power units into a new type of "regulatory power source" for the power grid.

[0056] In summary, the multi-source coordinated active power balance process system for thermal power flexibility proposed in this invention responds to the grid's rotational inertia, frequency regulation, deep peak shaving, ramping, and active power balance scheduling requirements by combining a flywheel energy storage frequency regulation system, a molten salt electric heating device, a molten salt energy storage device, and a "water-molten salt-steam inverse heat conversion system" with the thermal power unit. Furthermore, it integrates the flywheel energy storage frequency regulation system, molten salt electric heating device, molten salt energy storage device, and "water-molten salt-steam inverse heat conversion system" with the thermal power unit's steam flow regulation to form a "virtual frequency regulation power supply" for the power system. This power supply directly receives automatic power control scheduling from the grid's APC (Automatic Power Control System), providing the grid with rotational inertia, frequency regulation, peak shaving, and ramping active power balance services. Therefore, this invention can be widely applied in the fields of flywheel energy storage, molten salt energy storage, thermal power flexibility retrofitting and manufacturing, regulating power supplies, and power system "rotational inertia, frequency regulation, peak shaving, and ramping active power balance services." Attached Figure Description

[0057] Figure 1 This is a topology diagram of a flexible multi-source coordinated active power balance process system for thermal power provided in an embodiment of the present invention;

[0058] Figure 2 This is a topology diagram of a flywheel energy storage primary frequency regulation and auxiliary thermal power unit AGC frequency regulation process system provided in an embodiment of the present invention;

[0059] Figure 3 This is a topology diagram of an AGC frequency regulation and deep peak shaving process system for molten salt energy storage auxiliary thermal power units provided in an embodiment of the present invention;

[0060] Figure 4 It is a comparison chart of the primary frequency regulation effect of a thermal power unit - flywheel energy storage provided by an embodiment of the present invention;

[0061] The reference numerals in the figure are as follows:

[0062] 01. RTU (Remote Terminal Unit) of the power grid dispatching center, the full Chinese name is Remote Terminal Control System;

[0063] 02. Power grid;

[0064] 03. Busbar of the power plant switchyard; 03-1. First busbar of the power plant switchyard; 03-2. Second busbar of the power plant switchyard;

[0065] 04. Bus-coupling switch of the power plant switchyard;

[0066] 05. PMU (Phasor Measurement Unit) of the power plant, the full Chinese name is Phasor Measurement Unit;

[0067] 06. DCS (Distributed Control Systems) of the thermal power unit, the full Chinese name is Distributed Control System;

[0068] 07. Power supply transformer of the molten salt electric heating device;

[0069] 08. Steam turbine generator set;

[0070] 09. Transformer at the outlet of the steam turbine generator;

[0071] 10. Auxiliary transformer;

[0072] 11. Auxiliary 6kV busbar; 11-1. Section 1A of the auxiliary 6kV busbar; 11-2. Section 1B of the auxiliary 6kV busbar;

[0073] 12. Disconnector of the auxiliary 6kV busbar; 12-1. Disconnector of section 1A of the auxiliary 6kV busbar; 12-2. Disconnector of section 1B of the auxiliary 6kV busbar;

[0074] 13. Bus-coupling switch of the auxiliary 6kV busbar;

[0075] Flywheel energy storage frequency regulation system

[0076] 14. Busbar of the flywheel energy storage frequency regulation system;

[0077] 15. Disconnector of the busbar of the flywheel energy storage frequency regulation system; 15-1. Disconnector between the busbar of the flywheel energy storage frequency regulation system and section 1A of the auxiliary 6kV busbar, 15-2. Disconnector between the busbar of the flywheel energy storage frequency regulation system and section 1B of the auxiliary 6kV busbar;

[0078] 16. Flywheel energy storage frequency regulation system unit transformer;

[0079] 17. Thermal power plant flexible "active power balance" process control system DCS;

[0080] 18. Flywheel energy storage frequency regulation energy management system EMU (electric multiple units);

[0081] 19. Molten salt energy storage frequency regulation control system (DCS);

[0082] 20. Power supply isolating switch for flywheel energy storage frequency regulation system unit;

[0083] 21: Flywheel energy storage frequency regulation system unit bus;

[0084] 22. Flywheel energy storage device array busbar;

[0085] 23. Flywheel energy storage device array inverter PCS;

[0086] 24. Flywheel Management System (FMS) for Flywheel Energy Storage Device Array Management System;

[0087] 25. Flywheel Conversion System (FCS) for energy storage devices.

[0088] 26. Flywheel energy storage device;

[0089] Molten salt electric heating device:

[0090] 27. Molten salt electric heater;

[0091] 28. Power supply transformer incoming switch for molten salt electric heating device;

[0092] 29. Power supply isolating switch for molten salt electric heating device;

[0093] 30. Isolating switch for power supply to molten salt electric heater;

[0094] Molten salt energy storage device

[0095] 31. Cold salt container;

[0096] 32. Hot salt container;

[0097] 33. Cold salt pump;

[0098] 34. Cold salt pump salt supply gate;

[0099] 35. Isolation door for cold salt supply in molten salt electric heating device;

[0100] 36. Cold salt feed isolation door of the "water-molten salt-steam reverse heat exchanger";

[0101] 37. Cold salt return isolation door of the "water-molten salt-steam reverse heat exchanger";

[0102] 38. The cold salt supply pipeline of the molten salt electric heating device, i.e., the tee interface of the cold salt pump supply valve outlet pipeline to the cold salt inlet pipeline interface of the molten salt electric heating device;

[0103] 39. The cold salt supply pipeline of the "water-molten salt-steam reverse heat exchanger", that is, the pipeline between the tee interface of the cold salt pump outlet pipeline and the interface of the cold salt inlet pipeline of the "water-molten salt-steam reverse heat exchanger".

[0104] 40. The cold salt return pipeline of the "water-molten salt-steam reverse heat exchanger" runs from the cold salt outlet pipeline interface of the "water-molten salt-steam reverse heat exchanger" to the cold salt tank inlet pipeline interface;

[0105] 41. T-junction for the outlet pipeline of the cold salt pump;

[0106] 42. Cold salt tank salt supply pipeline, i.e., the pipeline between the inlet pipeline of the cold salt pump and the tee interface of the outlet pipeline of the cold salt pump salt supply valve;

[0107] 43. Hot salt pump;

[0108] 44. Salt supply valve at the outlet of the hot salt pump;

[0109] 45. Hot salt container return salt gate;

[0110] 46. ​​Hot salt return pipeline of molten salt electric heating device, that is, the pipeline between the hot salt outlet pipeline interface of molten salt electric heating device and the hot salt inlet pipeline interface of hot salt tank;

[0111] 47. "Water-molten salt-steam reverse heat exchange device";

[0112] 48. Isolation door for hot salt outlet of "Water-molten salt-steam reverse heat exchange device";

[0113] 49. Hot salt supply pipeline of molten salt electric heating device, i.e., from the hot salt outlet pipeline interface of "water-molten salt-steam reverse heat exchange device" to the hot salt inlet pipeline interface of molten salt electric heating device;

[0114] 50. Hot salt tank feed (supply) pipeline, i.e., from the outlet interface of the hot salt pump outlet feed valve 44 to the hot salt inlet pipeline interface of the "water-molten salt-steam reverse heat exchange device";

[0115] 51. Isolation door for hot salt feed in the "water-molten salt-steam reverse conversion heat exchanger";

[0116] 52. Boiler;

[0117] 53. Steam turbine; 53-1. High-pressure cylinder of steam turbine; 53-2. Intermediate-pressure cylinder of steam turbine; 53-3. Low-pressure cylinder of steam turbine;

[0118] 54. High-pressure bypass valve for steam turbine;

[0119] 55. High-pressure bypass valve outlet isolation gate for steam turbine;

[0120] 56. High-pressure bypass steam supply isolation door;

[0121] 57. Steam inlet regulating valve for steam turbine; 57-1. Steam inlet regulating valve for high-pressure cylinder of steam turbine; 57-2. Steam inlet regulating valve for intermediate-pressure cylinder of steam turbine;

[0122] 58. Steam turbine high-pressure heater feedwater system;

[0123] 59. Low-pressure feedwater pump for the "water-molten salt-steam reverse heat exchange device";

[0124] 60. Low-pressure feedwater isolation valve for the "water-molten salt-steam reverse heat exchanger";

[0125] 61. Isolation valve at the outlet of the boiler high-pressure feedwater pump;

[0126] 62. High-pressure feedwater inlet isolation valve of the "water-molten salt-steam reverse heat exchanger";

[0127] 63. Drainage isolation door for the "water-thermal salt-steam reverse heat exchange device";

[0128] 64. Drainage regulating valve of "Water-Hot Salt-Steam Reverse Heat Exchanger";

[0129] 65. Boiler feed water pump deaerator feed water pipeline, i.e., the pipeline from the outlet of the boiler feed water deaerator to the inlet of the boiler feed water pump.

[0130] 66. The deaerator feedwater pipeline of the low-pressure feedwater pump of the "water-molten salt-steam reverse heat exchange device", that is, from the outlet pipeline interface of the boiler feedwater deaerator to the inlet pipeline interface of the low-pressure feedwater pump of the "water-molten salt-steam reverse heat exchange device".

[0131] 67. High-pressure feedwater pipeline of the "water-molten salt-steam reverse heat exchanger", i.e., from the 95mm T-junction of the boiler high-pressure feedwater pipeline of the water-molten salt-steam reverse heat exchanger to the feedwater inlet pipeline interface of the water-molten salt-steam reverse heat exchanger.

[0132] 68. The low-pressure feedwater pipeline of the "water-molten salt-steam reverse heat exchanger", that is, from the outlet pipeline interface of the low-pressure feedwater pump of the water-molten salt-steam reverse heat exchanger to the feedwater inlet pipeline interface of the water-molten salt-steam reverse heat exchanger.

[0133] 69. The condensate drain pipe of the "water-molten salt-steam reverse heat exchanger", that is, the condensate outlet pipe interface of the water-molten salt-steam reverse heat exchanger to the main and reheat steam condensate inlet pipe interface of the boiler feedwater deaerator bypass.

[0134] 70. Steam turbine high-pressure bypass valve inlet steam isolation door;

[0135] 71. Auxiliary main steam inlet isolation valve of high-pressure bypass pipeline of steam turbine;

[0136] 72. Steam turbine low-pressure bypass valve inlet steam isolation door;

[0137] 73. Isolation valve for the steam supply pipeline of the turbine reheat hot section bypass;

[0138] 74. Bypass turbine main steam supply pressure regulating valve;

[0139] 75. Steam turbine low-pressure bypass valve outlet isolation valve;

[0140] 76. Isolation door for plant / industrial steam pipeline of "water-molten salt-steam reverse heat exchange device";

[0141] 77. "Water-molten salt-steam reverse heat exchanger" steam desuperheating supply for plant / industrial steam isolation door;

[0142] 78. "Water-molten salt-steam reverse heat exchanger" for plant / industrial steam check valve;

[0143] 79. Steam inlet header of the "water-molten salt-steam reverse heat exchanger";

[0144] 80. Auxiliary main steam supply pipeline, the auxiliary main steam supply pipeline interface of the "water-molten salt-steam reverse heat exchange device" to the tee interface of the turbine high-pressure bypass auxiliary main steam inlet pipeline;

[0145] 81. The high-pressure bypass steam supply pipeline of the turbine of the "water-molten salt-steam reverse heat exchanger", and the tee interface of the high-pressure bypass steam supply pipeline of the turbine to the inlet pipeline interface of the steam inlet header of the "water-molten salt-steam reverse heat exchanger";

[0146] 82. The steam supply pipeline for the reheat section of the bypass turbine, and the pipeline between the tee interface of the steam supply pipeline for the reheat section of the turbine and the steam inlet header interface of the "water-molten salt-steam reverse heat exchanger";

[0147] 83. Steam desuperheating supply for plant / industrial steam pipeline, the pipeline between the steam outlet pipeline interface of the built-in steam desuperheater of the "water-molten salt-steam reverse heat exchange device" and the tee interface of the molten salt heat release and steam desuperheating supply for plant / industrial steam pipeline;

[0148] 84. Molten salt heat release supply pipeline for plant / industrial steam, the pipeline between the plant / industrial steam supply pipeline interface of the "water-molten salt-steam reverse heat exchanger" and the plant / industrial steam supply pipeline interface of the unit;

[0149] 85. Low-pressure bypass valve for steam turbine;

[0150] 86. Boiler feedwater deaerator;

[0151] 87. Boiler feed water pump;

[0152] 88. The "water-molten salt-steam reverse heat exchange device" supplies auxiliary main steam isolation doors;

[0153] 89. Isolation valve for the steam inlet header of the "water-molten salt-steam reverse heat exchanger";

[0154] 90. T-junction for auxiliary main steam inlet pipeline of high-pressure bypass of steam turbine;

[0155] 91. Steam turbine high-pressure bypass steam supply pipeline tee;

[0156] 92. Check valve on the steam supply pipeline of the turbine reheat hot section bypass;

[0157] 93. T-junction for steam supply pipeline in the reheat section of the steam turbine;

[0158] 94. Molten salt heat release and steam desuperheating supply tee for plant / industrial steam pipelines;

[0159] 95. T-junction for high-pressure feedwater pipeline of boiler in "water-molten salt-steam reverse heat exchange device";

[0160] 96. Main steam supply pipeline for the steam turbine, and the pipeline between the main steam outlet of the boiler and the steam inlet regulating valve interface of the high-pressure cylinder of the steam turbine;

[0161] 97. T-junction for the main steam pipe from the steam turbine to the high-pressure bypass steam pipe;

[0162] 98. Steam pipelines in the reheat section of the steam turbine, and pipelines from the boiler reheater outlet to the steam inlet regulating valve interface of the intermediate pressure cylinder of the steam turbine and the low-pressure bypass valve interface of the steam turbine, respectively.

[0163] 99. High-pressure bypass steam pipeline of steam turbine, the pipeline between the tee interface of the main steam and high-pressure bypass steam pipeline of steam turbine and the interface of the isolation valve outlet of high-pressure bypass valve of steam turbine;

[0164] 100. Steam pipeline for low-pressure bypass of steam turbine. Detailed Implementation

[0165] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0166] In the description of this invention, it should be noted that the terms "upper," "lower," "axial," "circumferential," "horizontal," "vertical," "inlet," "outlet," "give," "return," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "inlet," "outlet," "give," "return," "front," and "rear" are used according to the direction of medium flow. Terms such as "first" and "second" are used to define components only for the convenience of distinguishing the aforementioned components. Unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0167] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly," "installation," and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. It should be specifically noted that, due to differences in thermal power unit capacity, coal type, and thermal system parameters, pipeline connections are intended for use within the corresponding system and are not fixed connection points. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0168] The structure or technical terminology involved in this invention will be further explained below.

[0169] The National Energy Administration's "Notice on the Management Measures for Electricity Auxiliary Services" (Guonengfa Jianguan Gui

[2021] No. 60) issued on December 21, 2021, clarifies that "active power balancing services" include frequency regulation, peak shaving, ramping, moment of inertia, and reserve power auxiliary services. Among these:

[0170] 1) Frequency modulation

[0171] Frequency regulation refers to the service provided by grid-connected entities to reduce frequency deviation when the power system frequency deviates from the target frequency, through speed control systems, automatic power control, and other methods. Frequency regulation is divided into primary frequency regulation and secondary frequency regulation. Primary frequency regulation refers to the service provided by conventional generating units through automatic response of speed control systems, and by grid-connected entities such as new energy sources and energy storage through rapid frequency response, to reduce frequency deviation when the power system frequency deviates from the target frequency. Secondary frequency regulation refers to the service provided by grid-connected entities through automatic power control technologies, including automatic generation control (AGC) and automatic power control (APC), to track the instructions issued by the power dispatching agency and adjust the power generation and consumption in real time according to a certain adjustment rate to meet the power system frequency and tie-line power control requirements.

[0172] 2) Peak shaving

[0173] Peak shaving refers to the service provided by grid-connected entities to adjust power generation and consumption or start / stop equipment according to instructions issued by the power dispatching agency in order to track the peak and valley changes in power system load and the changes in renewable energy output.

[0174] 3) Climbing a hill

[0175] Ramp-up refers to the service provided by grid-connected entities with strong load regulation rates to adjust their output according to instructions issued by the power dispatching agency in order to maintain the power balance of the power system in response to short-term and significant changes in the net load of the system caused by uncertain factors such as fluctuations in renewable energy generation.

[0176] 4) Moment of inertia

[0177] Moment of inertia refers to the service provided by the grid-connected entity to respond to the rate of change of the power system frequency by providing rapid positive damping based on its own inertial characteristics when the power system is subjected to disturbances, thereby preventing sudden changes in the power system frequency.

[0178] The following section, in conjunction with the accompanying drawings, describes the application of a flywheel energy storage frequency regulation system provided in this embodiment of the invention for primary frequency regulation; the integration of flywheel energy storage, molten salt electric heating device, molten salt thermal storage, and a "water-molten salt-steam inverse heat exchange device" with the steam flow regulation of the thermal power unit's thermal system transforms the thermal power unit from an "energy-type power source" to a "regulatory power source"; and the application of a multi-factor combination of flywheel energy storage, molten salt electric heating device, molten salt thermal storage, and a "water-molten salt-steam inverse heat exchange device" with the steam flow regulation of the thermal power unit to form a "virtual frequency regulation power source" for the power system, providing a "active power balance" process system for new energy units within the power grid, excluding standby, for rotational inertia, frequency regulation, peak shaving, and ramping.

[0179] Example 1

[0180] like Figures 1-3As shown, the thermal power flexibility multi-source coordinated active power balance process system provided in this embodiment includes a flywheel energy storage frequency regulation system, a molten salt energy storage frequency regulation system, and a thermal power flexibility "active power balance" process control system.

[0181] Among them, the charging and discharging lines of the flywheel energy storage frequency regulation system are connected to the 6KV busbar 11 of the unit.

[0182] The molten salt energy storage frequency regulation system includes a molten salt electric heating device, a molten salt energy storage device, and a water-molten salt-steam reverse heat exchange system containing a "water-molten salt-steam reverse heat exchange device." The molten salt electric heating device is powered by the power plant's switchgear busbar 03 and is connected to the cold salt tank 31 of the molten salt energy storage device via a cold salt supply pipeline 38. It is connected to the "water-molten salt-steam reverse heat exchange system" via a hot salt supply pipeline 49 and a hot salt return pipeline 46. The "salt-steam reverse heat exchange device" 47 is connected to the hot salt tank 32 of the molten salt energy storage device; the salt side pipeline of the "water-molten salt-steam reverse heat exchange device" 47 is also connected to the hot salt tank 32 through the hot salt supply pipeline 50 of the water-molten salt-steam reverse heat exchange device; it is connected to the cold salt supply pipeline 42 of the cold salt tank through the cold salt supply pipeline 39 of the "water-molten salt-steam reverse heat exchange device", and is connected to the cold salt tank 31 through the cold salt return pipeline 40 of the "water-molten salt-steam reverse heat exchange device".

[0183] The DCS 17 process control system for thermal power plant flexibility "active power balance" is used to control the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system to achieve "active power balance" service for the unit or the power grid.

[0184] In the above embodiments, preferably, as shown below, Figure 2 As shown, the electrical system of the flywheel energy storage frequency regulation system is connected to the 6kV busbar 11 of the thermal power unit, and a flywheel energy storage frequency regulation system busbar 14 and a flywheel energy storage frequency regulation system busbar disconnector 15 are installed between the electrical system of the flywheel energy storage frequency regulation system and the 6kV busbar 11.

[0185] In the above embodiments, preferably, the other side of the 6kV busbar 11 of the generating unit is connected to the power grid 02 through the 6kV busbar disconnecting switch 12, the generating unit transformer 10, the turbine generator set outlet transformer 09, and the power plant switch busbar 03.

[0186] In the above embodiments, preferably, the flywheel energy storage frequency regulation system includes several flywheel energy storage frequency regulation units connected in parallel. Each flywheel energy storage frequency regulation unit is equipped with a flywheel energy storage frequency regulation unit transformer 16. Each flywheel energy storage frequency regulation unit is connected in parallel to the flywheel energy storage frequency regulation system bus 14 and connected to the plant 6kV bus 11 via the flywheel energy storage frequency regulation system bus disconnect switch 15.

[0187] Each flywheel energy storage frequency regulation unit contains one or more sets of flywheel energy storage device array inverters PCS 23. The flywheel energy storage device array inverters PCS 23 are connected to the flywheel energy storage frequency regulation unit bus 21 through the flywheel energy storage device array inverter AC disconnection switch. The flywheel energy storage frequency regulation unit bus 21 is connected to the flywheel energy storage frequency regulation unit transformer 16 through the flywheel energy storage frequency regulation unit disconnection switch 20.

[0188] Each flywheel energy storage array inverter PCS 23 is connected to one or more flywheel energy storage modules via flywheel energy storage array bus 22. Each flywheel energy storage module consists of a flywheel energy storage array management system FMS 24 and several flywheel energy storage modules. Each flywheel energy storage module is connected to the flywheel energy storage array bus 22 via a flywheel energy storage converter DC switch. The flywheel energy storage array inverter PCS 23 controls one or more flywheel energy storage array management systems FMS 24. The flywheel energy storage array management system FMS 24 controls one or more flywheel energy storage converters FCS 25. Each flywheel energy storage converter FCS 25 controls one flywheel energy storage device 26.

[0189] In the above embodiments, preferably, as shown below, Figure 3 As shown, the molten salt electric heating device is equipped with a molten salt electric heating device power supply system and a molten salt electric heater 27. The molten salt electric heating device power supply system includes a power plant switchboard busbar power supply isolating switch 28, a molten salt electric heating device power supply transformer 07, a molten salt electric heating device power supply transformer isolating switch 29, and a molten salt electric heater power supply isolating switch 30, connected in sequence. The power supply transformer 07 is powered from the power plant switchboard busbar 03. The molten salt electric heater 27 is connected to the molten salt electric heater power supply isolating switch 30.

[0190] In the above embodiments, preferably, the molten salt electric heating device is provided with a cold salt supply system, including a cold salt tank 31, and a pipeline and equipment connecting the cold salt tank 31 to the molten salt electric heating device via a cold salt tank supply pipeline 42 and a cold salt supply pipeline 38. The cold salt tank supply pipeline 42 is provided with a cold salt pump 33, a cold salt pump supply valve 34, and a cold salt pump supply valve outlet pipeline tee 41. The molten salt electric heating device cold salt supply pipeline 38 is provided with a cold salt supply isolation valve 35.

[0191] In the above embodiments, preferably, the molten salt electric heating device is provided with a hot salt supply system, including a "water-molten salt-steam reverse heat exchange device" 47 and its pipeline equipment connected to the molten salt electric heating device through a hot salt supply pipeline 49. The hot salt supply pipeline 49 of the molten salt electric heating device is provided with a hot salt outlet isolation door 48 of the "water-molten salt-steam reverse heat exchange device" and a hot salt supply isolation door 51 of the molten salt electric heating device.

[0192] In the above embodiments, preferably, the molten salt electric heating device is provided with a hot salt return system: including the molten salt electric heating device and its hot salt return pipeline 46 leading to the hot salt tank 32, and the hot salt return pipeline 46 is provided with a hot salt tank return door 45.

[0193] In the above embodiments, preferably, the molten salt energy storage device includes a cold salt tank 31 and a hot salt tank 32, and a cold salt pump 33 and a cold salt supply valve 34 are provided on the cold salt supply pipeline 42 of the cold salt tank 31; a hot salt pump 43 and a hot salt pump supply valve 44 are provided on the salt supply pipeline of the hot salt tank 32. The cold salt in the cold salt tank 31 is connected to the cold salt supply pipeline 38 of the molten salt electric heating device and the cold salt supply pipeline 39 of the "water-molten salt-steam reverse heat exchange device" via the cold salt pump 33, the cold salt pump supply valve 34, and the cold salt pump supply valve outlet tee 41. The return salt pipeline 40 of the cold salt tank 31 is connected from the cold salt outlet pipeline interface of the "water-molten salt-steam reverse heat exchange device" to the inlet pipeline interface of the cold salt tank, and a cold salt return valve 37 is installed on it. The hot salt supply pipeline of the hot salt tank 32 is connected to the hot salt supply pipeline 50 via the hot salt pump 43 and the hot salt pump outlet supply valve 44. The hot salt return pipeline of the hot salt tank 32 is the hot salt return pipeline 46 of the molten salt electric heating device.

[0194] In the above embodiments, preferably, the water-molten salt-steam reverse heat exchange system includes a "water-molten salt-steam reverse heat exchange device" 47 with both molten salt heat release and heat absorption bidirectional heat exchange functions; the molten salt thermal storage auxiliary peak shaving system includes a bypass turbine main steam pressure reduction and steam supply system, a bypass turbine reheat steam supply system, a steam desuperheating and plant / industrial steam supply system, and a condensate drainage system for the "water-molten salt-steam reverse heat exchange device"; the molten salt heat release auxiliary peak shaving system includes a high-pressure feedwater system for the "water-molten salt-steam reverse heat exchange device", an auxiliary main steam supply system, a molten salt heat release and plant / industrial steam supply system, and a low-pressure feedwater system for the "water-molten salt-steam reverse heat exchange device".

[0195] Among them, the "water-molten salt-steam reverse heat exchange device" 47: the salt-side pipeline is connected to the molten salt energy storage device, and the steam-side pipeline is connected to the bypass turbine main steam pressure reduction steam supply system, the bypass turbine reheat steam supply system, the steam desuperheating supply plant / industrial steam system, the auxiliary main steam supply system, and the molten salt heat release supply plant / industrial steam system respectively; the water-side pipeline is connected to the high-pressure feedwater system of the "water-molten salt-steam reverse heat exchange device", the low-pressure feedwater system of the "water-molten salt-steam reverse heat exchange device", and the condensate system of the "water-molten salt-steam reverse heat exchange device" respectively;

[0196] The bypass turbine main steam pressure reduction and steam supply system and the bypass turbine reheat steam supply system are combined with the "water-molten salt-steam inverted heat exchange device" 47 to realize molten salt heat absorption and storage, steam de-temperature supply for plant / industrial steam, and increase the unit's heating capacity and peak shaving range.

[0197] The bypass turbine main steam pressure reduction and steam supply system, the bypass turbine reheat steam supply system, the "water-molten salt-steam reverse heat exchange device" drainage system, and the "water-molten salt-steam reverse heat exchange device" 47 work together to achieve molten salt heat absorption and storage, and deep peak shaving of the unit.

[0198] The boiler high-pressure feedwater system, the "water-molten salt-steam reverse heat exchange device" high-pressure feedwater system, the auxiliary main steam supply system and the "water-molten salt-steam reverse heat exchange device" 47 work together to realize molten salt heat release and economic operation of the unit;

[0199] The low-pressure feedwater system and molten salt-steam reverse heat exchanger system of the "water-molten salt-steam reverse heat exchanger" are used in conjunction with the "water-molten salt-steam reverse heat exchanger" 47 to realize molten salt heat release, increase the unit's heating capacity and peak shaving range, and enable the unit to operate economically.

[0200] In the above embodiments, preferably, the water-molten salt-steam reverse heat exchange device 47 has a built-in steam desuperheater, condenser, and condensate cooler connected in sequence to realize the forward molten salt heat absorption and heat exchange function; and a feedwater preheater, steam generator, and steam superheater connected in sequence to realize the reverse molten salt heat release and heat exchange function.

[0201] In the above embodiments, preferably, the bypass turbine main steam pressure reduction and steam supply system includes: a main steam pipeline 96 between the boiler 52 and the turbine high-pressure cylinder inlet regulating valve 57-1, which connects to the turbine high-pressure bypass steam pipeline 99 via a turbine main steam to high-pressure bypass steam pipeline tee 97, and is connected to the "water-molten salt-steam reverse heat exchange device" turbine high-pressure bypass steam supply pipeline 81 via a turbine high-pressure bypass valve inlet isolation valve 70, a turbine high-pressure bypass steam supply pipeline tee 91, and a "water-molten salt-steam reverse heat exchange device" turbine high-pressure bypass steam supply pipeline 81. The steam inlet header 79 of the "heat conversion device" 47 is connected to the pipeline interface, and the high-pressure bypass steam supply pipeline 81 of the steam turbine of the "water-molten salt-steam reverse heat conversion device" is equipped with a high-pressure bypass steam supply isolation valve 56 and a bypass steam turbine main steam supply pressure regulating valve 74. The other end of the steam turbine high-pressure bypass steam supply pipeline tee 91 is connected to the existing steam turbine high-pressure bypass valve 54 and is equipped with a high-pressure bypass valve outlet isolation valve 55. The existing steam turbine main steam pipeline 96 is connected to the boiler 52 via the steam turbine main steam to the high-pressure bypass steam pipeline tee 97.

[0202] In the above embodiments, preferably, the bypass turbine reheat steam supply system includes: an existing turbine reheat hot section steam pipeline 98 led from boiler 52, passing through a turbine low-pressure bypass valve inlet isolation gate 72, a turbine reheat hot section steam supply pipeline tee 93, and a bypass turbine reheat hot section steam supply pipeline 82, which connects to the inlet header 79 of the "water-molten salt-steam reverse heat exchanger". A turbine reheat hot section bypass valve is installed on the bypass turbine reheat hot section steam supply pipeline 82. The steam supply pipeline has a non-return valve 92 and a turbine reheat hot section bypass steam supply pipeline isolation valve 73. The existing turbine reheat hot section steam pipeline 98 is connected to the existing turbine low-pressure bypass valve 85 on the other side via the installed turbine reheat hot section steam supply pipeline tee 93. A turbine low-pressure bypass valve outlet isolation valve 75 and a connecting pipeline 100 are installed on the outlet side of the turbine low-pressure bypass valve 85. The other end of the existing turbine reheat hot section steam pipeline 98 is connected to the turbine intermediate pressure cylinder inlet steam regulating valve 57-2.

[0203] Among them, attention should be paid to the setting of the bypass turbine reheat steam supply system. The selection of the bypass turbine reheat steam supply flow rate requires the manufacturer to perform verification calculations on the turbine body. If necessary, the existing turbine intermediate pressure cylinder inlet regulating valve 57-2 and turbine intermediate pressure cylinder 53-2 body parts should be modified.

[0204] In the above embodiments, preferably, the steam desuperheating supply system for plant / industrial steam includes a built-in steam desuperheater in a "water-molten salt-steam reverse heat exchange device" 47 and a steam desuperheating supply pipeline 83 for plant / industrial steam. The steam desuperheating supply pipeline 83 for plant / industrial steam is connected to the molten salt heat release and steam desuperheating supply pipeline for plant / industrial steam tee 94 via molten salt heat release and the existing plant / industrial steam pipeline. The molten salt heat release supply pipeline for plant / industrial steam is equipped with an isolation valve 76 for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam, and a non-return valve 78 for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam is installed on the plant / industrial steam pipeline.

[0205] In the above embodiments, preferably, the condensate drainage system of the "water-molten salt-steam reverse heat exchanger" includes a condensate drainage pipeline 69 leading out from the condensate drainage outlet pipe interface of the "water-molten salt-steam reverse heat exchanger" to introduce the condensate into the existing boiler feedwater deaerator 86 of the unit. A condensate drainage isolation valve 63 and a condensate drainage regulating valve 64 are provided on the condensate drainage pipeline 69 of the "water-molten salt-steam reverse heat exchanger".

[0206] In the above embodiments, preferably, the high-pressure feedwater system of the "water-molten salt-steam reverse heat exchanger" includes: a feedwater system 58 that is led out from the interface pipeline of the existing boiler feedwater deaerator 86, passes through the existing boiler feedwater pump deaeration feedwater pipeline 65, boiler feedwater pump 87, boiler high-pressure feedwater pump outlet isolation valve 61, and turbine high-pressure heater feedwater system; a boiler high-pressure feedwater pipeline tee 95 for the "water-molten salt-steam reverse heat exchanger", a boiler high-pressure feedwater inlet isolation valve 62 for the "water-molten salt-steam reverse heat exchanger", and a boiler high-pressure feedwater pipeline 67 for the "water-molten salt-steam reverse heat exchanger", and is connected to the boiler high-pressure feedwater pipeline interface of the "water-molten salt-steam reverse heat exchanger" through this pipeline; the other end of the boiler high-pressure feedwater pipeline tee 95 for the "water-molten salt-steam reverse heat exchanger" is connected to the existing equipment boiler 52 of the unit.

[0207] In the above embodiments, preferably, the auxiliary main steam supply system includes: a main steam supply pipeline 80 leading from the steam outlet pipeline interface of the "water-molten salt-steam reverse heat exchanger" and its auxiliary main steam isolation valve 88; an auxiliary main steam inlet isolation valve 71 of the turbine high-pressure bypass pipeline; a tee 90 of the turbine high-pressure bypass auxiliary main steam inlet pipeline; an existing turbine high-pressure bypass steam pipeline 99; a turbine high-pressure bypass valve inlet isolation valve 70; and a turbine main steam pipeline 96, leading to the turbine high-pressure cylinder inlet regulating valve 57-1. The other end of the turbine high-pressure bypass steam supply pipeline tee 91 is connected to an existing turbine high-pressure bypass valve 54 on the turbine high-pressure bypass steam pipeline 99, and a turbine high-pressure bypass valve outlet isolation valve 55 and connecting pipeline are installed. The other end of the turbine main steam pipeline 96 is connected to the boiler 52.

[0208] In the above embodiments, preferably, the low-pressure feedwater system of the "water-molten salt-steam reverse heat exchanger" includes a low-pressure feedwater deaerator 66 led out from the existing boiler feedwater deaerator 86 of the unit, a low-pressure feedwater pump 59, a low-pressure feedwater pipeline 68 of the "water-molten salt-steam reverse heat exchanger", and a low-pressure feedwater isolation valve 60 of the "water-molten salt-steam reverse heat exchanger" connected to the low-pressure feedwater pipeline interface of the "water-molten salt-steam reverse heat exchanger".

[0209] In the above embodiments, preferably, the molten salt heat release system for supplying plant / industrial steam includes a molten salt heat release pipeline 84 leading from the "water-molten salt-steam reverse heat exchange device", a molten salt heat release pipeline for supplying plant / industrial steam isolation valve 76 of the "water-molten salt-steam reverse heat exchange device", and a non-return valve 78 for the supply pipeline for plant / industrial steam, which is connected to the existing plant / industrial steam pipeline of the unit.

[0210] In the above embodiments, preferably, the thermal power flexibility "active power balance" process monitoring and control system includes a grid dispatch center remote terminal control system RTU 01, a power plant PMU 05, a thermal power unit DCS 06, a thermal power flexibility "active power balance" process control system 17, a flywheel energy storage frequency regulation energy management system EMU 18, and a molten salt energy storage frequency regulation control system DCS 19.

[0211] Among them, the thermal power plant's flexible "active power balance" process control system DCS 17 is connected to the grid dispatch center's remote terminal control system RTU 01, the unit's DCS 06, the flywheel energy storage frequency regulation energy management system EMU 18, and the molten salt energy storage frequency regulation control system DCS 19, respectively; the power plant's PMU 05 is connected to the grid dispatch center's remote terminal control system RTU 01, the unit's DCS 06, and the flywheel energy storage frequency regulation energy management system EMU 18.

[0212] Specifically, the thermal power plant's flexible "active power balance" process control system DCS 17 receives the power dispatching instructions from the grid dispatch center RTU 01AGC and the power generation information from the unit's DCS 06. After processing, it sends control information to the flywheel energy storage frequency regulation energy management system EMU 18 and the molten salt energy storage frequency regulation control system DCS 19. The flywheel energy storage frequency regulation energy management system EMU 18 controls the power generation and consumption of the flywheel energy storage frequency regulation system, while the molten salt energy storage frequency regulation control system DCS 19 controls the power consumption of the controllable load molten salt electric heating device and the steam supply of the unit in the "water-molten salt-steam inverse heat exchange system," as well as the heat storage or release of the molten salt energy storage device, thereby realizing the "active power balance service" for the unit or the grid.

[0213] The following describes the various functional modules of the flexible multi-source coordinated active power balance process system for thermal power provided in this embodiment:

[0214] The cold salt supply function of the molten salt electric heating device is achieved by the cold salt tank supply pipeline 42, which is set between the cold salt pump inlet pipeline and the cold salt pump outlet valve tee 41 interface, and the molten salt electric heating device cold salt supply pipeline 38, which is set between the cold salt pump outlet valve tee 41 interface and the molten salt electric heating device cold salt inlet pipeline interface. The cold salt tank 31 is equipped with a cold salt pump 33 and a cold salt pump outlet valve 34, and the molten salt electric heating device cold salt isolation valve 35 is set on the molten salt electric heating device cold salt supply pipeline 38.

[0215] The hot salt supply function of the molten salt electric heating device is achieved by the hot salt supply pipeline 49 of the molten salt electric heating device, which is set from the hot salt outlet pipeline of the "water-molten salt-steam reverse heat exchange device" to the hot salt inlet pipeline interface of the molten salt electric heating device, and the hot salt outlet isolation door 48 and the hot salt supply isolation door 51 of the "water-molten salt-steam reverse heat exchange device" set in the pipeline;

[0216] The hot salt return function of the molten salt electric heating device is realized by the hot salt return pipeline 46 of the molten salt electric heating device, which is set between the hot salt outlet pipeline interface of the molten salt electric heating device and the hot salt inlet pipeline interface of the hot salt tank, and the hot salt return valve 45 of the hot salt tank set thereon;

[0217] The cold salt supply function of the "water-molten salt-steam reverse heat exchange device" is achieved by the cold salt tank supply pipeline 42 set between the cold salt pump inlet pipeline and the cold salt pump feed valve outlet pipeline tee 41 interface, and the "water-molten salt-steam reverse heat exchange device" cold salt supply pipeline 39 set between the cold salt pump feed valve outlet pipeline tee interface and the "water-molten salt-steam reverse heat exchange device" cold salt inlet pipeline interface. The "water-molten salt-steam reverse heat exchange device" cold salt supply isolation valve 36 is set on the "water-molten salt-steam reverse heat exchange device" cold salt supply pipeline 39.

[0218] The hot salt return function of the "water-molten salt-steam reverse heat exchange device" is determined based on the molten salt performance and the steam supply parameters of the "water-molten salt-steam reverse heat exchange system". The hot salt return function selected by the present invention according to the high parameters is the hot salt supply function of the aforementioned molten salt electric heating device. According to the molten salt performance and the steam supply parameters of the "water-molten salt-steam reverse heat exchange system", it can also be connected from the hot salt outlet of the "water-molten salt-steam reverse heat exchange device" to the hot salt tank inlet.

[0219] The salt return function of the cold salt tank is achieved by the cold salt return pipeline 40 of the "water-molten salt-steam reverse heat exchange device" installed between the cold salt outlet pipeline interface of the "water-molten salt-steam reverse heat exchange device" and the cold salt return isolation door 37 of the "water-molten salt-steam reverse heat exchange device" on it.

[0220] The salt supply function of the hot salt tank is achieved by the hot salt tank 31, the hot salt pump inlet, and the hot salt inlet pipe interface of the "water-molten salt-steam reverse heat exchange device" with the hot salt supply pipeline 50 and the hot salt outlet isolation gate 48 of the "water-molten salt-steam reverse heat exchange device". The hot salt tank 32 is equipped with a hot salt pump 43 and a hot salt pump supply gate 44.

[0221] The electric heating device's cold salt heat absorption and energy storage device's heat storage functions are achieved through the coordinated operation of the cold salt tank 31, the cold salt tank supply pipeline 42, the cold salt pump 33, the cold salt supply valve 34, the cold salt pump supply valve outlet pipeline tee 41, the "water-molten salt-steam reverse conversion heat exchange device" cold salt supply isolation valve 36, the molten salt electric heating device's cold salt supply pipeline 38, the molten salt electric heating device's cold salt supply isolation valve 35, the molten salt electric heater 27, the molten salt electric heating device's hot salt return pipeline 46, and the hot salt tank return valve 45 and the hot salt tank 32.

[0222] The functions of steam-heated cold salt, electric-heated hot salt heat absorption, and energy storage are achieved through the cooperation of the cold salt tank 31, cold salt tank supply pipeline 42, cold salt pump 33, cold salt supply valve 34, cold salt pump supply valve outlet pipeline tee 41, water-molten salt-steam reverse heat exchange device cold salt supply pipeline 39 and water-molten salt-steam reverse heat exchange device cold salt supply isolation valve 36, water-molten salt-steam reverse heat exchange device 47, molten salt electric heating device hot salt supply pipeline 49 and molten salt electric heating device hot salt supply isolation valve 51, molten salt electric heater 27, molten salt electric heating device hot salt return pipeline 46 and hot salt tank return valve 45, hot salt tank 32 and corresponding molten salt electric heating device cold salt supply isolation valve 35, and hot salt pump outlet supply valve 44.

[0223] The molten salt heat release and energy storage device heat release functions are achieved through the cooperation of the hot salt tank 32, the hot salt pump 43, the hot salt pump feed valve 44, the hot salt feed pipeline 50 of the "water-molten salt-steam reverse heat exchange device", the "water-molten salt-steam reverse heat exchange device" 47, the cold salt return pipeline 40, the cold salt return isolation valve 37 of the "water-molten salt-steam reverse heat exchange device", the cold salt tank 31, and the corresponding water and steam side systems of the "water-molten salt-steam reverse heat exchange device" and the cold salt feed isolation valve 36.

[0224] The system includes heat release from the energy storage device, molten salt heat release from the "water-molten salt-steam reverse heat exchanger," and boiler deaeration feedwater supply for plant / industrial steam. It is connected to the unit's plant / industrial steam supply pipeline via the boiler feedwater deaerator 86, low-pressure feedwater pump deaeration feedwater pipeline 66, low-pressure feedwater pump 59, low-pressure feedwater pipeline 68 of the "water-molten salt-steam reverse heat exchanger," low-pressure feedwater isolation valve 60 of the "water-molten salt-steam reverse heat exchanger," the "water-molten salt-steam reverse heat exchanger" 47 and its plant / industrial steam supply pipeline isolation valve 76, molten salt heat release supply pipeline for plant / industrial steam 84, and the "water-molten salt-steam reverse heat exchanger" plant / industrial steam supply check valve 78. The corresponding valves on the steam and water side pipelines connected to the "water-molten salt-steam reverse heat exchange device" are closed: steam desuperheating supply plant / industrial steam isolation door 77, auxiliary main steam isolation door 88, steam inlet header isolation door 89, high-pressure feedwater inlet isolation door 62, and condensate isolation door 63. The heat release of the energy storage device is coordinated to achieve this.

[0225] The system includes heat release from the energy storage device, molten salt heat release from the "water-molten salt-steam reverse heat exchange device," and feedwater supply to the main steam system of the turbine high-pressure heater feedwater system 58. The feedwater is supplied by the boiler feedwater deaerator 86 via the boiler feedwater pump deaeration feedwater pipeline 65, boiler feedwater pump 87, turbine high-pressure heater feedwater system 58, "water-molten salt-steam reverse heat exchange device" high-pressure feedwater pipeline 67, and the "water-molten salt-steam reverse heat exchange device" high-pressure feedwater inlet isolation valve 62 connected to the pipeline, and the "water-molten salt-steam reverse heat exchange device" 47. The "salt-steam reverse conversion heat exchange device" uses the auxiliary main steam supply pipeline 80 and its auxiliary main steam isolation valve 88, the turbine high-pressure bypass pipeline auxiliary main steam inlet isolation valve 71, the turbine high-pressure bypass steam pipeline 99 and its turbine high-pressure bypass valve inlet isolation valve 70, the turbine main steam pipeline 96, and the turbine high-pressure cylinder inlet regulating valve 57-1 to enter the turbine high-pressure cylinder 53-1. Correspondingly, the turbine high-pressure bypass valve outlet isolation valve 55 and the turbine high-pressure bypass valve inlet isolation valve 70 are closed. The energy storage device cooperates with the heat release to achieve this.

[0226] The bypass turbine main steam desuperheating supply provides plant / industrial steam, the "water-molten salt-steam reverse heat exchanger" molten salt absorbs heat, and the energy storage device stores heat. Main steam from boiler 52 turbine is supplied to the high-pressure bypass steam pipeline tee 97, which then enters the turbine main steam pipeline 96 and the turbine high-pressure bypass steam pipeline 99. One path passes through the turbine high-pressure bypass valve inlet isolation gate 70, the "water-molten salt-steam reverse heat exchanger" turbine high-pressure bypass steam supply pipeline 81, and its high-pressure bypass steam supply isolation gate 5. 6. The bypass turbine main steam supply pressure regulating valve 74, the steam desuperheater of the "water-molten salt-steam reverse heat exchange device", the steam desuperheating supply to the plant / industrial steam pipeline 83 and the steam desuperheating supply to the plant / industrial steam isolation valve 77 on it, the molten salt heat release supply to the plant / industrial steam pipeline 84, and the "water-molten salt-steam reverse heat exchange device" supply to the plant / industrial steam non-return valve 78 are connected to the unit's plant / industrial steam supply pipeline, and one of them enters the turbine high-pressure cylinder 53-1 through the high-pressure cylinder inlet regulating valve 57-1. Correspondingly, adjust the steam inlet regulating valve 57-1 of the high-pressure cylinder of the steam turbine, and close the auxiliary main steam inlet isolation valve 71 of the high-pressure bypass pipeline of the steam turbine, the steam outlet isolation valve 55 of the high-pressure bypass valve of the steam turbine, the isolation valve 73 of the bypass steam supply pipeline of the reheat hot section of the steam turbine, the isolation valve 88 of the auxiliary main steam supply pipeline of the "water-molten salt-steam reverse heat exchange device" and the isolation valve 76 of the plant / industrial steam supply pipeline, the steam inlet header 79 of the "water-molten salt-steam reverse heat exchange device" and the isolation valve 76 of the plant / industrial steam supply pipeline on it, the low-pressure feedwater isolation valve 60, the high-pressure feedwater inlet isolation valve 62, and the drain isolation valve 63, so that the energy storage device can cooperate with the heat storage.

[0227] The bypass turbine reheat steam desuperheating supply for plant / industrial steam, the molten salt heat absorption of the "water-molten salt-steam reverse heat exchanger", and the heat storage function of the energy storage device are all provided by the boiler 52 via the turbine reheat hot section steam pipeline 98 and its turbine low-pressure bypass valve inlet isolation valve 72, the bypass turbine reheat hot section steam supply pipeline 82 and its turbine reheat hot section bypass steam supply pipeline isolation valve 73, the turbine reheat hot section bypass steam supply pipeline check valve 92, the "water-molten salt-steam reverse heat exchanger" inlet header 79 and inlet header isolation valve 89, the "water-molten salt-steam reverse heat exchanger" steam desuperheating, and the steam desuperheating supply for plant / industrial steam pipeline 83 and its steam desuperheating supply for plant / industrial steam. The industrial steam isolation valve 77, the molten salt heat release supply plant / industrial steam pipeline 84, and the water-molten salt-steam reverse heat exchange device supply plant / industrial steam non-return valve 78 are connected to the unit's plant / industrial steam supply pipeline. Correspondingly, the turbine intermediate pressure cylinder inlet steam regulating valve 57-2 is adjusted, and the steam and water side pipeline valves connected to the water-molten salt-steam reverse heat exchange device are closed. There are turbine low-pressure bypass valve outlet isolation valve 75, high-pressure bypass steam supply isolation valve 56, water-molten salt-steam reverse heat exchange device auxiliary main steam isolation valve 88, plant / industrial steam supply pipeline isolation valve 76, high-pressure feedwater inlet isolation valve 62, and condensate isolation valve 63. The energy storage device and heat storage are coordinated to achieve this.

[0228] The heat exchange and energy storage function of the bypass turbine main steam "water-molten salt-steam reverse heat exchange device" is carried out by the boiler 52 through the turbine main steam pipeline 96, the turbine high-pressure bypass steam pipeline 99 and the turbine high-pressure bypass valve inlet isolation valve 70, the turbine high-pressure bypass steam supply pipeline 81 of the "water-molten salt-steam reverse heat exchange device" and the high-pressure bypass steam supply isolation valve 56 and the bypass turbine main steam supply pressure regulating valve 74, the "water-molten salt-steam reverse heat exchange device" 47, the "water-molten salt-steam reverse heat exchange device" drain pipeline 69 and the drain isolation valve 63 and drain regulating valve 64, and finally into the boiler feedwater deaerator 86. Correspondingly, adjust the steam inlet regulating valve 57-1 of the high-pressure cylinder of the steam turbine, close the auxiliary main steam inlet isolation valve 71 of the high-pressure bypass pipeline of the steam turbine, the outlet isolation valve 55 of the high-pressure bypass valve of the steam turbine, the isolation valve 73 of the bypass steam supply pipeline of the reheat hot section of the steam turbine, the isolation valve 77 of the steam desuperheating supply for plant / industrial use of the "water-molten salt-steam reverse heat exchange device", the isolation valve 88 of the auxiliary main steam supply pipeline and the isolation valve 76 of the supply pipeline for plant / industrial use, the low-pressure feedwater isolation valve 60 of the "water-molten salt-steam reverse heat exchange device" and the high-pressure feedwater inlet isolation valve 62, and the energy storage device heat storage is coordinated to achieve the desired effect;

[0229] The heat exchange and energy storage function of the "water-molten salt-steam reverse heat exchange device" in the reheat section of the bypass turbine is achieved by the boiler 52 through the steam pipeline 98 of the reheat section of the turbine and the turbine low-pressure bypass valve inlet isolation valve 72, the steam supply pipeline 82 of the bypass section of the turbine and the steam supply pipeline isolation valve 73 of the bypass section of the turbine, the non-return valve 92 of the bypass section of the turbine, the steam inlet header 79 and the steam inlet header isolation valve 89 of the "water-molten salt-steam reverse heat exchange device", the "water-molten salt-steam reverse heat exchange device" 47, the condensate drain pipeline 69 of the "water-molten salt-steam reverse heat exchange device" and the condensate drain isolation valve 63 and the condensate regulating valve 64, and finally into the boiler feedwater deaerator 86. The corresponding adjustments are made to the turbine intermediate-pressure cylinder inlet regulating valve 57-2, and the valves on the steam and water side pipelines connected to the "water-molten salt-steam reverse heat exchange device" are closed, including the turbine low-pressure bypass valve outlet isolation valve 75, the high-pressure bypass steam supply isolation valve 56, the "water-molten salt-steam reverse heat exchange device" auxiliary main steam supply isolation valve 88, the plant / industrial steam supply pipeline isolation valve 76, the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater isolation valve 60 and high-pressure feedwater inlet isolation valve 62. The energy storage device and heat storage are coordinated to achieve this.

[0230] Example 2

[0231] Based on the thermal power flexible multi-source coordinated active power balancing process system provided in Embodiment 1, this embodiment takes the flywheel energy storage frequency regulation system providing rotational inertia and primary frequency regulation active power balancing services as an example to introduce the application method of the thermal power flexible multi-source coordinated active power balancing process system.

[0232] Primary frequency regulation active power balancing service refers to the service provided by the flywheel energy storage frequency regulation system to adjust active power output and reduce frequency deviation when the frequency of the power grid system where the generating unit is located deviates from the target frequency. It mainly includes the following two situations:

[0233] The first type is a flywheel energy storage frequency regulation system that replaces the primary frequency regulation function of conventional thermal power units;

[0234] 1) The flywheel energy storage frequency regulation energy management system EMU 18 receives power information from the power plant PMU 05 or a separately set high-precision grid power meter, and receives energy information from the flywheel energy storage device array inverter PCS 23;

[0235] 2) The flywheel energy storage frequency regulation energy management system EMU 18 calculates the frequency disturbance based on the power information received from the power plant PMU 05 or measured by a separately set high-precision grid frequency meter, compares the deviation with the target frequency, and schedules and controls the charging and discharging power of the flywheel energy storage device array inverter PCS 23.

[0236] 3) After receiving the charging and discharging power command from the flywheel energy storage array inverter PCS 23, the flywheel energy storage array inverter PCS 23 schedules and controls the charging and discharging power of the flywheel energy storage array management system FMS 24.

[0237] 4) After receiving the charging and discharging power control command from the flywheel energy storage array inverter PCS 23, the flywheel energy storage array management system FMS 24 schedules and controls the charging and discharging operation of the flywheel energy storage device 26.

[0238] The second type, the flywheel energy storage frequency regulation system, provides the power grid with rotational inertia and primary frequency regulation "active power balance" services.

[0239] 1) The power dispatch center RTU 01 sends the dispatch power command to the flywheel energy storage frequency regulation energy management system EMU 18 through the "active power balance" auxiliary control system DCS 17 or directly;

[0240] 2) After receiving the AGC dispatch power command from the DCS17 "Active Power Balance" auxiliary control system or the RTU 01 of the power grid dispatch center, the flywheel energy storage frequency regulation energy management system EMU18 dispatches and controls the charging and discharging power of the flywheel energy storage device array inverter PCS 23.

[0241] 3) After receiving the charging and discharging power command from the flywheel energy storage frequency regulation energy management system EMU18, the flywheel energy storage device array inverter PCS 23 schedules and controls the charging and discharging power of the flywheel array management system FMS 24.

[0242] 4) After receiving the charging and discharging power control command from the flywheel energy storage array inverter PCS 23, the flywheel array management system FMS 24 schedules and controls the charging and discharging operation of the flywheel energy storage device 26.

[0243] like Figure 4 The figure shows a comparison of the primary frequency regulation effect of thermal power units and flywheel energy storage. As can be seen from the figure, the response delay of flywheel energy storage and the entire process time from 0-100% target power are less than 200 milliseconds. The charging and discharging power and stored electricity of the flywheel energy storage system can reduce the frequency fluctuation amplitude in the initial stage of power system faults (within 2-10 seconds), increasing the frequency at the lowest point of the grid fault or decreasing the frequency at the highest point. Compared with conventional generator sets, the virtual inertial response characteristics of flywheel energy storage have constant power fast response, short-term support, and recovery without rotational inertial potential energy. Therefore, it can coordinate with the delay and persistence of other traditional frequency regulation power sources, fully leveraging their respective advantages to better support the grid frequency under transient faults.

[0244] ① National standards for primary frequency regulation performance of thermal power units

[0245] In the frequency / speed step disturbance test, the primary frequency regulation dynamic performance of thermal power units should meet the following requirements:

[0246] a) The lag time of the active power of primary frequency regulation should not exceed 2 s;

[0247] b) The time for the active power of thermal power plants to reach 75% of the target power during primary frequency regulation should not exceed 15 s, the rise time should not exceed 30 s, and the adjustment time of active power should not exceed 45 s.

[0248] c) The overshoot of active power during primary frequency regulation shall not exceed 30%, and the number of oscillations shall not exceed 2.

[0249] ②The typical dynamic performance of primary frequency regulation in thermal power units

[0250] Taking a 300-350MW unit as an example:

[0251] a) Although the lag time of the active power of primary frequency regulation is no more than 2 seconds, the deviation is large within 2-3 seconds, reaching up to 50% of the target power;

[0252] b) The average settling time of active power is between 44 and 49 seconds;

[0253] c) Although the average overshoot of the active power in primary frequency regulation is no more than 30%, the maximum value is close to 30%;

[0254] d) Theoretical power / frequency: 4.67MW / 0.66Hz, 9.33MW / 0.1Hz;

[0255] e) Primary frequency regulation power deviation > 3MW;

[0256] f) The speed unequal rate of thermal power units is usually adjusted to <5%, and the load adjustment amount is about 2.33MW / r / min, which is equivalent to 14MW / 0.1Hz.

[0257] ③ Example of main technical parameter configuration for flywheel energy storage frequency regulation system:

[0258] Power: Configured according to Article 5.3 of GB / T40595-2021 "Technical Specifications and Test Guidelines for Primary Frequency Regulation of Grid-Connected Power Supply" and 25% of the primary frequency regulation limit standard. For example, for generator sets with a rated active power of 350 MW ≤ Rated Active Power < 500 MW, the primary frequency regulation power variation range should not be less than ±8% of the rated active power. The technical parameters configuration of the flywheel energy storage frequency regulation system are as follows:

[0259] Rated: Charge / discharge power 14MW (4% of rated power), charge / discharge rate 1C, duration 12min;

[0260] Maximum: Charge / discharge power 28 MW (8% of rated power), charge / discharge rate 2C, duration 6 minutes;

[0261] First-order frequency modulation delay: <200 milliseconds;

[0262] Note: 1C refers to the continuous discharge of a rechargeable battery for one hour, based on its nominal capacity. 1 usually refers to the rate of discharge, and C represents the capacity. For example, if a battery has a capacity of 2200mAh, it will be discharged at a current of 2200mAh, which is the 1C discharge method. 2C refers to twice the charge and discharge rate. A 2200mAh battery can be charged and discharged from 0 to 100% in 0.5 hours.

[0263] According to relevant literature, to suppress grid frequency over-limits: when the frequency drops to 49.9 Hz, the required energy storage duration is 4 minutes; to suppress low-frequency load shedding: when the frequency drops to 49.75 Hz, the required energy storage duration is 6 minutes. Specific applications should be determined based on frequency characteristic tests or simulation calculations of the power grid system where the generating unit is located.

[0264] Thermal power units commonly use a primary frequency regulation scheme. When the unit load is within the rated regulation range and the CCS coordination system is engaged, primary frequency regulation is jointly achieved by the DEH control system and the CCS coordination control system. DEH primary frequency regulation is used for rapid frequency response. After the primary frequency regulation on the DEH side takes effect, the primary frequency regulation on the CCS side also activates to avoid the CCS coordination primary frequency regulation action contradicting the DEH regulation. Simultaneously, the CCS-side primary frequency regulation can ultimately achieve the primary frequency regulation target requirements. When the unit is not under CCS coordination control, the unit's primary frequency regulation is achieved solely by the DEH control system.

[0265] When thermal power units engage AGC (Automatic Guided Service) dispatching, for short-duration (second-level) and turnaround AGC dispatching commands, the unit's response delay and inertia not only affect the quality of primary frequency regulation but also frequently cause secondary frequency regulation to reverse with primary frequency regulation. Replacing primary frequency regulation with a flywheel energy storage frequency regulation system allows for the installation of primary frequency regulation activation / deactivation buttons in the unit's control system, such as the unit's DCS 06. When the flywheel energy storage frequency regulation system is in operation, setting the primary frequency regulation function of the unit's control system to the deactivated state effectively avoids mutual interference between AGC frequency regulation and primary frequency regulation. Setting up the flywheel energy storage frequency regulation system does not alter the original primary frequency regulation scheme design of the unit's DEH (Deep Energy Storage) control system and CCS (Computer-Controlled System) coordinated control system.

[0266] Example 3

[0267] Based on the thermal power flexible multi-source coordinated active power balancing process system provided in Embodiment 1, this embodiment takes secondary frequency regulation active power balancing service as an example to introduce the application method of the thermal power flexible multi-source coordinated active power balancing process system.

[0268] The secondary frequency regulation of the flexible multi-source coordinated "active power balance" process system of thermal power is achieved through automatic power control technology, including automatic generation control (AGC) and automatic power control (APC). It tracks the instructions issued by the power dispatching agency and adjusts the power generation and consumption in real time according to the adjustment rate specified by the State Grid standard to meet the control requirements of the power system's automatic generation control (AGC) and automatic power control (APC).

[0269] 1. Secondary frequency regulation method for joint thermal power units responding to RTU 01 AGC dispatch instructions from the power grid dispatch center

[0270] The main steps include:

[0271] 1) The active power balance auxiliary control system DCS 17 receives AGC power target instruction information sent by RTU 01 of the power grid dispatch center and power generation status information sent by DCS 06 of the generating unit;

[0272] 2) The active power balance auxiliary control system DCS 17 compares and analyzes the quality of the unit DCS 06's power generation to the grid dispatch center RTU 01 AGC's dispatch power command based on the energy storage and operating status of the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system, as well as the dynamic performance status of the unit DCS 06 AGC frequency regulation. It also analyzes and dispatches the operation of the active power balance process system in terms of power generation and power consumption.

[0273] 2. The secondary frequency modulation application method of the multi-source coordinated "active power balance" process system provided in this embodiment

[0274] For a single AGC frequency adjustment: the percentage of target power ≤18MW (5.5% of rated power) is >97%, and the percentage of duration ≤6min is ≥91%; for two or more consecutive AGC adjustments in one direction: the percentage of target power ≤18MW (5.5% of rated power) is >22%, the percentage of target power ≤42MW (12.7% of rated power) is >98%, the percentage of duration ≤5min is ≤37%, and the percentage of duration ≥13min is <3%.

[0275] Therefore, this embodiment divides the target power value adjustment based on the RTU 01 AGC of the power grid dispatch center into two cases:

[0276] Scenario 1: The target power for regulation by the power grid dispatch center RTU 01 AGC is less than (8% of the unit's rated power + the unit's basic regulation rate × the unit's rated power).

[0277] At this point, the application of a multi-source coordinated "active power balance" process system for flexible thermal power generation, which integrates flywheel energy storage frequency regulation system with AGC frequency regulation of thermal power units, includes the following steps:

[0278] 1) Determine the regulation rate within the unit's full-load regulation range;

[0279] 2) Determine the SOC (state of charge) percentage of the remaining energy in the flywheel energy storage frequency regulation system;

[0280] 3) The generating units respond to the grid dispatch center's RTU 01 AGC adjustment of target power according to their own capabilities;

[0281] 4) The flywheel energy storage frequency regulation energy management system EMU 18 dispatches according to the difference between the target power adjustment command of the grid dispatch center RTU 01 AGC and the real-time power generation of the unit DCS 06 read by the "active power balance" process control system DCS 17, and sequentially dispatches and controls the flywheel energy storage device array inverter PCS 23, flywheel energy storage device array management system FMS 24, flywheel energy storage device converter FCS 25, and flywheel energy storage device 26 to regulate the operation of power generation and consumption.

[0282] 5) When the output power of the flywheel energy storage frequency regulation system and the unit meets the power accuracy requirements of the RTU 01 AGC of the power grid dispatch center, the voltage of the flywheel energy storage device array bus 22 is first adjusted to constant voltage operation within the rated parameter range, and the charge and discharge rate of the flywheel energy storage device 26 is adjusted to <2C. When the output power of the unit meets the power accuracy requirements of the RTU 01 AGC of the power grid dispatch center, the flywheel energy storage frequency regulation system stops outputting power and usually maintains 50±5% SOC for standby operation.

[0283] The second scenario: The target power of the grid dispatch center RTU 01 AGC regulation is greater than (8% of the unit's rated power + the unit's basic regulation rate × the unit's rated power).

[0284] Two typical forms of application methods for the multi-source coordinated "active power balance" process system of thermal power with the integration of flywheel energy storage frequency regulation system, molten salt energy storage frequency regulation system, and AGC frequency regulation of thermal power unit;

[0285] First type: Molten salt energy storage frequency regulation system in hot standby mode, molten salt electric heating device in operation:

[0286] 1) The difference between the cumulative grid-connected power regulated by the flywheel energy storage combined with the thermal power unit and the target power regulated by the grid dispatch center RTU 01 AGC is less than or equal to the power regulation capability of the molten salt electric heating device under operating conditions. Main application methods:

[0287] ① The flywheel energy storage frequency regulation system, in conjunction with the thermal power unit, has reached saturation in regulating the cumulative grid-connected power.

[0288] ②The molten salt electric heating device is a controllable load. The combined output power of the molten salt electric heating device, the flywheel energy storage frequency regulation system, and the thermal power unit is adjusted to reach the target power of the grid dispatch center RTU 01 AGC.

[0289] ③ The power regulation sequence of the RTU 01 AGC in response to the power grid dispatch center is as follows: generator power of the unit DCS 06, power generation and consumption of the flywheel energy storage frequency regulation energy management system EMU 18, and power consumption of the molten salt energy storage frequency regulation control system DCS 19. The steam supply mode and flow rate of the steam turbine of the "water-molten salt-steam inverse heat conversion system" and the power load of the "molten salt electric heating device" are regulated.

[0290] 2) The difference between the cumulative grid-connected power regulated by the flywheel energy storage combined with the thermal power unit and the target power regulated by the grid dispatch center RTU 01 AGC is greater than the regulation capacity of the molten salt electric heating device under operating conditions. Main application methods:

[0291] ① The combined power generation of the flywheel energy storage and molten salt electric heating unit has reached saturation.

[0292] ②The “water-molten salt-steam inverse heat exchange system” is used as a controllable load. The cumulative output power of the “water-molten salt-steam inverse heat exchange device” 47 integrated thermal power unit combined with flywheel energy storage frequency regulation system and molten salt electric heating device is adjusted to reach the target power of RTU 01 AGC of the power grid dispatch center.

[0293] ③ The power regulation sequence of the RTU 01 AGC in response to the power grid dispatch center is as follows: generator power of the unit DCS 06, power generation and consumption of the flywheel energy storage frequency regulation energy management system EMU 18, and power consumption of the molten salt energy storage frequency regulation control system DCS 19. The steam flow of the turbine of the "water-molten salt-steam inverse heat conversion system" and the power load of the "molten salt electric heating device" are regulated.

[0294] The second scenario: The molten salt energy storage frequency regulation system is in hot standby mode, and the molten salt electric heating device is not in operation.

[0295] When the peak-to-valley difference in the power grid is large and the power generation of new energy sources fluctuates significantly, the RTU 01 AGC adjustment command from the power grid dispatch center continuously increases or decreases in one direction. When the flywheel energy storage capacity is insufficient (using Method 1), the unit's adjustment rate has reached its maximum, and the accumulated power fed into the grid is still unbalanced with the target power of the RTU 01 AGC adjustment from the power grid dispatch center:

[0296] 1) Increase power

[0297] ① The water-molten salt-steam reverse conversion heat exchange system supplies power to the plant / industrial steam system, reducing turbine steam extraction and increasing power generation;

[0298] ② The water-molten salt-steam inverted heat exchange system supplies the main steam system, increasing the main steam inlet flow of the turbine and thus increasing power generation.

[0299] 2) Reduce power

[0300] The water-molten salt-steam reverse conversion heat exchange system bypasses the main steam or reheat hot section steam to heat the molten salt for heat storage, and drains the water to the deaerator.

[0301] The second type is not suitable for minute-level frequency regulation and turnaround operation due to the large workload of steam and molten salt system operation. It is more suitable for hourly grids with two peaks and two valleys or three peaks and two valleys per day, and for grid dispatch center RTU 01 AGC adjustment commands that are continuously increased or decreased in one direction and the target power of dispatching changes significantly. Special attention should be paid to the operation of steam system drainage and steam connection.

[0302] The main technical parameters of the molten salt energy storage frequency regulation system include:

[0303] Molten salt electric heater power: >20% of the unit's rated power;

[0304] Molten salt electric heating energy storage system 0-100% rated power adjustment time: <5 min;

[0305] Molten salt energy storage: >20% of the unit's rated power (MW) × 7 hours;

[0306] Molten salt heat release main steam flow rate: >20%B-MCRt / h;

[0307] Adjustment time for molten salt heat release to supply main steam flow rate from 0-100% of rated output: <5min.

[0308] Example 4

[0309] Based on the thermal power flexible multi-source coordinated active power balancing process system provided in Embodiment 1, this embodiment provides a thermal power flexible multi-source coordinated active power balancing process system that integrates thermal power units to form a "virtual frequency regulation power supply" to provide rotational inertia, primary frequency regulation, and secondary frequency regulation "active power balancing services" for the power grid and new energy units. The application method is as follows:

[0310] 1) The active power balance auxiliary control system DCS 17 uploads information related to the dispatch power, frequency regulation performance, and energy storage capacity of the flywheel energy storage frequency regulation energy management system EMU 18 and the molten salt energy storage frequency regulation control system DCS19 to the power grid dispatch center RTU 01.

[0311] 2) The power grid dispatch center RTU 01 sends (APC) automatic power control commands to the "active power balance" auxiliary control system DCS 17 or sends primary frequency regulation control commands to the flywheel energy storage frequency regulation energy management system EMU 18. The flywheel energy storage frequency regulation energy management system EMU 18 controls the charging and discharging operation of the flywheel energy storage frequency regulation system and provides rotational inertia and primary frequency regulation services.

[0312] 3) The power grid dispatch center RTU 01 issues an Automatic Power Control (APC) command to the Active Power Balance Auxiliary Control System DCS 17, wherein:

[0313] ① Power increase adjustment sequence: Flywheel energy storage frequency regulation system generates electricity; molten salt electric heating device operates with reduced load; molten salt energy storage device releases heat, and "water-molten salt-steam reverse conversion heat exchange system" supplies plant / industrial steam or main steam for power generation;

[0314] ② Power reduction adjustment sequence: The flywheel energy storage frequency regulation system operates with electricity; the "water-molten salt-steam reverse conversion heat exchange system" bypasses the main steam or reheat steam as needed for power adjustment, or bypasses both the main steam and reheat steam simultaneously, and the molten salt energy storage device stores heat; the molten salt electric heating device is loaded, and the molten salt energy storage device stores heat.

[0315] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible multi-source coordinated active power balancing process system for thermal power plants, characterized in that, include: Flywheel energy storage frequency regulation system, molten salt energy storage frequency regulation system, and thermal power flexible "active power balance" process control system; The flywheel energy storage frequency regulation system is connected to the 6KV busbar (11) of the thermal power unit. The molten salt energy storage frequency regulation system includes a molten salt electric heating device, a molten salt energy storage device, and a water-molten salt-steam reverse heat exchange system containing a "water-molten salt-steam reverse heat exchange device"; The power source for the molten salt electric heating device is taken from the power plant switch bus (03). The molten salt electric heating device is connected to the molten salt energy storage device through the molten salt electric heating device cold salt supply pipeline (38) and the molten salt electric heating device hot salt return pipeline (46); and is connected to the "water-molten salt-steam inverted heat exchanger" (47) through the molten salt electric heating device hot salt supply pipeline (49). The salt-side pipeline of the "water-molten salt-steam reverse heat exchange device" (47) is connected to the molten salt energy storage device through the cold salt supply pipeline (39) of the "water-molten salt-steam reverse heat exchange device", and is connected to the molten salt electric heating device through the hot salt supply pipeline (49) of the molten salt electric heating device. After secondary heating by the molten salt electric heating device, it is connected to the molten salt energy storage device through the hot salt supply pipeline (50) of the molten salt electric heating device. The thermal power flexibility "active power balance" process control system is used to monitor and control the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system to achieve "active power balance service" for the unit or the power grid. The water-molten salt-steam reverse heat exchange system includes a "water-molten salt-steam reverse heat exchange device" (47), a molten salt thermal storage auxiliary peak shaving system, and a molten salt heat release auxiliary peak shaving system; The molten salt thermal storage auxiliary peak-shaving system includes a bypass turbine main steam pressure reduction and supply system, a bypass turbine reheat steam supply system, a steam desuperheating supply system for plant / industrial steam, and a condensate drainage system for the "water-molten salt-steam inverted heat exchange device"; The molten salt heat release auxiliary peak shaving system includes a high-pressure feedwater system for the "water-molten salt-steam reverse heat exchange device", an auxiliary main steam supply system, a molten salt heat release supply system for plant / industrial steam, and a low-pressure feedwater system for the "water-molten salt-steam reverse heat exchange device". The salt-side pipeline of the "water-molten salt-steam reverse heat exchange device" is connected to the molten salt energy storage device and the molten salt electric heating device; the steam-side pipeline is connected to the bypass turbine main steam pressure reduction steam supply system, the bypass turbine reheat steam supply system, the steam desuperheating supply plant / industrial steam system, the auxiliary main steam supply system, and the molten salt heat release supply plant / industrial steam system; the water-side pipeline is connected to the high-pressure feedwater system, the low-pressure feedwater system, and the condensate drainage system of the "water-molten salt-steam reverse heat exchange device".

2. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The flywheel energy storage frequency regulation system includes several flywheel energy storage frequency regulation units connected in parallel. Each flywheel energy storage frequency regulation unit is connected in parallel to the flywheel energy storage frequency regulation system bus (14) via the flywheel energy storage frequency regulation unit transformer (16), and is connected to the 6kV bus (11) of the thermal power unit via the flywheel energy storage frequency regulation system bus disconnect switch (15). Each of the aforementioned flywheel energy storage frequency regulation units contains at least one set of flywheel energy storage device array inverters PCS (23). Each of the aforementioned flywheel energy storage device array inverters PCS (23) is connected to the flywheel energy storage frequency regulation unit bus (21) through the flywheel energy storage device array inverter AC isolation switch. The flywheel energy storage frequency regulation unit bus (21) is connected to the flywheel energy storage frequency regulation unit transformer (16) through the flywheel energy storage frequency regulation unit isolation switch (20).

3. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 2, characterized in that, Each of the aforementioned flywheel energy storage device array inverters PCS (23) is connected to at least one flywheel energy storage device module via the flywheel energy storage device array bus (22); each of the aforementioned flywheel energy storage device modules consists of a flywheel energy storage array management system FMS (24) and several flywheel energy storage device modules, each of the aforementioned flywheel energy storage device modules is connected to the flywheel energy storage device array bus (22) via a flywheel energy storage device converter DC switch, the flywheel energy storage device array inverter PCS (23) controls the corresponding flywheel energy storage array management system FMS (24), the flywheel energy storage array management system FMS (24) controls the corresponding flywheel energy storage device converter FCS (25), and each of the aforementioned flywheel energy storage device converter FCS (25) controls one flywheel energy storage device (26).

4. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The molten salt electric heating device is equipped with a molten salt electric heating device power supply system and a molten salt electric heater (27). The power supply system of the molten salt electric heating device includes a power plant switch plant bus power supply isolation switch (28), a molten salt electric heating device power supply transformer (07), a molten salt electric heating device power supply transformer power supply isolation switch (29), and a molten salt electric heater power supply isolation switch (30) connected in sequence, and the other side of the molten salt electric heater power supply isolation switch (30) is connected to the molten salt electric heater (27). The molten salt electric heater (27) is connected to the molten salt energy storage device via the cold salt supply pipeline (38) of the molten salt electric heating device, and a cold salt supply isolation door (35) is provided on the cold salt supply pipeline (38) of the molten salt electric heating device; the molten salt electric heater (27) is connected to the "water-molten salt-steam reverse heat exchange device" (47) via the hot salt supply pipeline (49) of the molten salt electric heating device, and a "water-molten salt-steam reverse heat exchange device" hot salt supply isolation door (51) is provided on the hot salt supply pipeline (49) of the molten salt electric heating device; the molten salt electric heater (27) is connected to the molten salt energy storage device via the hot salt return pipeline (46) of the molten salt electric heating device.

5. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The molten salt energy storage device includes a cold salt tank (31) and a hot salt tank (32). The cold salt tank (31) is connected to the molten salt electric heating device and the "water-molten salt-steam reverse heat exchange device" (47) through the cold salt tank supply pipeline (42), and the cold salt tank supply pipeline (42) is equipped with a cold salt pump (33) and a cold salt pump supply valve (34); the cold salt tank (31) is also connected to the "water-molten salt-steam reverse heat exchange device" (47) through the "water-molten salt-steam reverse heat exchange device" return salt pipeline (40), and the "water-molten salt-steam reverse heat exchange device" cold salt return salt isolation valve (37) is installed on the "water-molten salt-steam reverse heat exchange device" return salt pipeline (40); The hot salt tank (32) is connected to the salt supply pipeline (50) of the molten salt electric heating device and the "water-molten salt-steam reverse heat exchange device" (47) via the hot salt pump (43) and the hot salt pump outlet salt supply valve (44).

6. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The "water-molten salt-steam reverse heat exchange device" has a built-in steam desuperheater, condenser, and condensate cooler connected in sequence to achieve forward molten salt heat absorption; and a feedwater preheater, steam generator, and steam superheater connected in sequence to achieve reverse heat release.

7. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The high-pressure feedwater system of the "water-molten salt-steam reverse heat exchange device" includes a boiler feedwater pump deaerator feedwater pipeline (65) led out from the boiler feedwater deaerator (86) of the thermal power unit, a boiler feedwater pump (87), a boiler high-pressure feedwater pump outlet isolation valve (61), a steam turbine high-pressure heater feedwater system (58), a boiler high-pressure feedwater pipeline tee (95) of the "water-molten salt-steam reverse heat exchange device", a high-pressure feedwater pipeline (67) of the "water-molten salt-steam reverse heat exchange device" and a high-pressure feedwater inlet isolation valve (62) of the "water-molten salt-steam reverse heat exchange device" installed on it; The low-pressure feedwater system of the "water-molten salt-steam reverse heat exchange device" includes the deaeration feedwater pipeline (66) of the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater pump (59), the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater pipeline (68) and the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater isolation valve (60) on the "water-molten salt-steam reverse heat exchange device" from the boiler feedwater deaerator (86) of the thermal power unit; The condensate drainage system of the "water-molten salt-steam reverse heat exchange device" includes the condensate drainage pipeline (69) of the "water-molten salt-steam reverse heat exchange device" led out from the boiler feedwater deaerator (86) of the thermal power unit, as well as the condensate drainage isolation valve (63) and condensate drainage regulating valve (64) on it.

8. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The bypass turbine main steam pressure reduction and steam supply system is connected to the turbine high-pressure bypass steam pipeline (99) via the turbine main steam pipeline (96) led out from the turbine high-pressure cylinder inlet regulating valve (57-1) of the thermal power unit, through the turbine main steam to high-pressure bypass steam pipeline tee (97), and then through the turbine high-pressure bypass valve inlet isolation valve (70), the turbine high-pressure bypass steam supply pipeline tee (91), and the "water-molten salt-steam reverse heat exchange device" turbine high-pressure bypass steam supply pipeline (81) to the inlet steam of the "water-molten salt-steam reverse heat exchange device". The main pipe (79) is connected to the pipeline interface, and the high pressure bypass steam supply pipeline (81) of the "water-molten salt-steam reverse heat exchange device" is equipped with a high pressure bypass steam supply isolation valve (56) and a bypass steam turbine main steam supply pressure regulating valve (74). The other end of the high pressure bypass steam supply pipeline tee (91) is connected to the high pressure bypass valve (54) and the high pressure bypass valve outlet isolation valve (55). The other end of the steam turbine main steam pipeline (96) is connected to the boiler (52) via the steam turbine main steam to the high pressure bypass steam pipeline tee (97). The bypass turbine reheat steam supply system is connected to the inlet header (79) of the "water-molten salt-steam inverted heat exchanger" via the turbine reheat hot section steam pipeline (98) led out from the boiler (52), the turbine low-pressure bypass valve inlet isolation valve (72), the turbine reheat hot section steam supply pipeline tee (93), and the bypass turbine reheat hot section steam supply pipeline (82). The bypass turbine reheat hot section steam supply pipeline (82) is equipped with a turbine reheat hot section bypass. The steam supply pipeline has a non-return valve (92) and a turbine reheat hot section bypass steam supply pipeline isolation valve (73). The turbine reheat hot section steam pipeline (98) is connected to the turbine low-pressure bypass valve (85) through the other side of the turbine reheat hot section steam supply pipeline tee (93). A turbine low-pressure bypass valve outlet isolation valve (75) and a connecting pipeline (100) are provided on the outlet side of the turbine low-pressure bypass valve (85). The turbine reheat hot section steam pipeline (98) is also connected to the turbine (53). The steam desuperheating system for plant / industrial steam includes: a steam desuperheating pipeline (83) connected to the "water-molten salt-steam reverse heat exchange device" (47); the steam desuperheating pipeline (83) is connected to the molten salt heat release pipeline (84) and the plant / industrial steam pipeline via a tee (94); the molten salt heat release pipeline (84) is equipped with an isolation valve (76) for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam pipeline; and the plant / industrial steam pipeline is equipped with a non-return valve (78) for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam. The auxiliary main steam supply system is led out from the steam outlet pipeline interface of the "water-molten salt-steam inverted heat exchange device" and passes through the auxiliary main steam supply pipeline (80) of the "water-molten salt-steam inverted heat exchange device" and its auxiliary main steam isolation valve (88), the auxiliary main steam inlet isolation valve (71) of the turbine high-pressure bypass pipeline, the tee (90) of the turbine high-pressure bypass auxiliary main steam inlet pipeline of the turbine unit, the turbine high-pressure bypass valve inlet isolation valve (70), and the turbine main steam pipeline (96) to enter the turbine high-pressure cylinder inlet regulating valve; The molten salt heat release supply system for plant / industrial steam includes a molten salt heat release supply system for plant / industrial steam pipeline (84) connected to the "water-molten salt-steam reverse heat exchange device" (47) and a "water-molten salt-steam reverse heat exchange device" supply system for plant / industrial steam isolation door (76) installed on it. The other end of the "water-molten salt-steam reverse heat exchange device" supply system for plant / industrial steam isolation door (76) is connected to the tee (94) of the molten salt heat release and steam de-cooling supply system for plant / industrial steam pipeline.

9. The flexible multi-source coordinated active power balancing process system for thermal power plants as described in claim 1, characterized in that, The thermal power flexibility "active power balance" process monitoring and control system includes a grid dispatch center remote terminal control system RTU (01), a power plant PMU (05), a thermal power unit DCS (06), a thermal power flexibility "active power balance" process control system DCS (17), a flywheel energy storage frequency regulation energy management system EMU (18), and a molten salt energy storage frequency regulation control system DCS (19). The thermal power flexibility "active power balance" process control system DCS (17) is connected to the grid dispatch center remote terminal control system RTU (01), the thermal power unit DCS (06), the flywheel energy storage frequency regulation energy management system EMU (18), and the molten salt energy storage frequency regulation control system DCS (19), respectively. The power plant PMU (05) is connected to the grid dispatch center remote terminal control system RTU (01), the thermal power unit DCS (06), and the flywheel energy storage frequency regulation energy management system EMU (18).

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