Application method of thermal power flexibility multi-source coordination "active balance" process system

Abstract

The application relates to an application method of a thermal power flexibility multi-source coordination active balance process system, which comprises the following steps: setting a thermal power flexibility multi-source coordination active balance service process system, the system comprising a flywheel energy storage frequency modulation system, a molten salt energy storage frequency modulation system and a thermal power flexibility active balance process monitoring and control system; the flywheel energy storage frequency modulation system is controlled to provide the rotational inertia of a thermal power plant or primary frequency modulation active balance service; the flywheel energy storage frequency modulation system and the molten salt energy storage frequency modulation system are fused to form a virtual frequency modulation power source composed of thermal power units, so as to provide multi-source coordination active balance service. The application can be widely applied to the technical field of thermal power flexibility reconstruction active balance service.

Description

Technical Field

[0001] This invention relates to an application method of an "active power balancing" process system, and more particularly to an application method of a multi-source coordinated "active power balancing" process system for thermal power plant flexibility. It belongs to the technical fields of flywheel energy storage, molten salt energy storage, thermal power plant flexibility retrofitting and manufacturing, regulating power supply, 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] According to relevant documents, the following measures should be taken: Thermal power units should undergo heating system retrofitting to optimize the operation of existing combined heat and power (CHP) units. Technical upgrades to CHP units are encouraged to further improve heating capacity and meet increased heat load demands. The flexible manufacturing and retrofitting of thermal power units should continue, taking into account technical feasibility, economic efficiency, and operational safety. After flexible retrofitting, the minimum power generation output of existing thermal power units should reach approximately 30% of the rated load. The implementation of flexible manufacturing and retrofitting of thermal power units should be accelerated, and all existing thermal power units should undergo flexible retrofitting as much as possible. The general requirement for peak-shaving capacity under pure condensing conditions is a minimum power generation output of 35% of the rated load. During the heating season, heating CHP units should strive to achieve a minimum power generation output of 40% of the rated load for 6 hours per day 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 issues, the purpose of this invention is to provide an application method for a flexible multi-source coordinated "active power balance" process system for thermal power. This method includes: 1) independently responding to replace primary frequency regulation of thermal power units; 2) combining thermal power units with high-quality response to grid AGC frequency regulation and peak shaving; and 3) integrating thermal power units or independently forming a "virtual frequency regulation power source" to provide the grid with rotational inertia, primary frequency regulation, and ramp-up "active power balance" services.

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

[0015] An application method for a flexible multi-source coordinated "active power balance" process system in thermal power plants includes the following steps:

[0016] Set up a flexible multi-source coordinated "active power balance service" process system for thermal power, which includes a flywheel energy storage frequency regulation system, a molten salt energy storage frequency regulation system, and a flexible "active power balance" process control system for thermal power.

[0017] Control the flywheel energy storage frequency regulation system to provide active power balance services for the rotational inertia or primary frequency regulation of thermal power plants;

[0018] A "virtual frequency regulation power supply" is formed by integrating a flywheel energy storage frequency regulation system and a molten salt energy storage frequency regulation system with thermal power units to provide multi-source coordinated "active power balance" services.

[0019] Furthermore, 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"; wherein, the power supply of the molten salt electric heating device is taken from the power plant switchyard bus, and the molten salt electric heating device is connected to the molten salt energy storage device through a cold salt supply pipeline and a hot salt return pipeline; the salt-side pipeline of the "water-molten salt-steam reverse heat exchange device" is connected to the molten salt energy storage device through the cold salt supply pipeline 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 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 return pipeline of the molten salt electric heating device.

[0020] 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. All flywheel energy storage frequency regulation units are connected in parallel to the busbar of the flywheel energy storage frequency regulation system and connected to the 6kV power supply busbar via the busbar disconnector of the flywheel energy storage frequency regulation system. Each flywheel energy storage frequency regulation unit contains one or more sets of flywheel energy storage device array inverters (PCS). The flywheel energy storage device array inverters (PCS) are connected to the flywheel energy storage frequency regulation unit busbar via an AC disconnector of the flywheel energy storage device array inverters. Each flywheel energy storage array inverter is connected to one or more flywheel energy storage modules via the flywheel energy storage array bus; each flywheel energy storage module consists of a flywheel energy storage array management system (FMS) and several flywheel energy storage modules; each flywheel energy storage module is connected to the flywheel energy storage array bus via a flywheel energy storage converter DC switch; the flywheel energy storage array inverter (PCS) controls one or more flywheel energy storage array management systems (FMS); the flywheel energy storage array management system (FMS) controls one or more flywheel energy storage converters (FCS); and each flywheel energy storage converter (FCS) controls one flywheel energy storage device.

[0021] The thermal power plant flexibility "active power balance" process monitoring and control system is used to monitor and control the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system. It includes a power grid dispatch center RTU, a power plant PMU, a thermal power unit DCS, a thermal power plant flexibility "active power balance" process control system DCS, a flywheel energy storage frequency regulation energy management system EMU, and a molten salt energy storage frequency regulation control system DCS. The thermal power plant flexibility "active power balance" process control system DCS is connected to the power grid dispatch center RTU, the thermal power unit DCS, the flywheel energy storage frequency regulation energy management system EMU, and the molten salt energy storage frequency regulation control system DCS, respectively. The power plant PMU is connected to the power grid dispatch center RTU, the thermal power unit DCS, and the flywheel energy storage frequency regulation energy management system EMU.

[0022] Furthermore, the control of the flywheel energy storage frequency regulation system to provide power plant rotational inertia or primary frequency regulation "active power balance" services includes:

[0023] Based on the power information sent by the power plant's PMU, a flywheel energy storage frequency regulation system is used to replace the thermal power unit to achieve primary frequency regulation "active power balance" service;

[0024] Based on the dispatch power command sent by the power grid dispatch center RTU, the flywheel energy storage frequency regulation system independently provides the power grid with rotational inertia and primary frequency regulation "active power balance" services.

[0025] Furthermore, the method of using a flywheel energy storage frequency regulation system to replace thermal power units to achieve primary frequency regulation "active power balance" service based on power information sent by the power plant PMU includes:

[0026] The flywheel energy storage frequency regulation energy management system (EMU) receives energy information from the power plant's PMU and the flywheel energy storage array inverter (PCS).

[0027] The flywheel energy storage frequency regulation energy management system (EMU) calculates the frequency disturbance based on the power information received from the power plant's PMU, compares it with the frequency deviation of the target frequency, and schedules and controls the charging and discharging power of the flywheel energy storage device array inverter (PCS).

[0028] The flywheel energy storage device array inverter PCS receives the charging and discharging power commands sent by the flywheel energy storage frequency modulation energy management system EMU, and schedules and controls the charging and discharging power of the flywheel energy storage device array management system FMS.

[0029] The FMS (Flywheel Energy Storage Array Management System) receives charging and discharging power control commands from the PCS (Power Control System) of the flywheel energy storage array, schedules and controls the charging and discharging operation of the flywheel energy storage devices, and realizes the primary frequency regulation "active power balance" service.

[0030] Furthermore, the method of using a flywheel energy storage frequency regulation system to independently provide rotational inertia and primary frequency regulation "active power balance" services to the power grid based on the dispatch power command sent by the power grid dispatch center RTU includes:

[0031] The power grid dispatching unit (RTU) sends dispatching power commands to the thermal power plant's flexible "active power balance" process control system (DCS) or directly to the flywheel energy storage frequency regulation energy management system (EMU).

[0032] After receiving the dispatch power command issued by the DCS of the thermal power plant's flexible "active power balance" process control system or the RTU of the power grid dispatch center, the EMU of the flywheel energy storage frequency regulation energy management system dispatches and controls the charging and discharging power of the PCS of the flywheel energy storage device array.

[0033] After receiving the charging and discharging power command sent by the flywheel energy storage array inverter PCS, the flywheel energy storage device array inverter (PCS) schedules and controls the charging and discharging power of the flywheel energy storage device array management system (EMU).

[0034] After receiving the charging and discharging power control command sent by the flywheel energy storage array inverter PCS, the FMS schedules and controls the charging and discharging operation of the flywheel energy storage device to provide the grid with rotational inertia and primary frequency regulation "active power balance" services.

[0035] Furthermore, the aforementioned use of a flywheel energy storage frequency regulation system and a molten salt energy storage frequency regulation system integrated with a thermal power unit to form a "virtual frequency regulation power supply" to provide multi-source coordinated "active power balance" services includes:

[0036] Based on the AGC adjustment target power command information of the power grid dispatch center RTU and the power generation status information sent by the thermal power unit DCS, the power system provides the "active power balance" service for secondary frequency regulation.

[0037] Based on the AGC target power command of the power grid dispatch center RTU, the secondary frequency regulation "active power balance" service of the power system is provided by integrating the flywheel energy storage frequency regulation system, the flywheel energy storage frequency regulation system and / or the molten salt energy storage frequency regulation system with the thermal power unit.

[0038] By integrating flywheel energy storage frequency regulation system and molten salt energy storage frequency regulation system with thermal power units to form a "virtual frequency regulation power source" for the power grid, it provides power system rotational inertia, frequency regulation, ramping, deep peak shaving or APC "active power balance" services.

[0039] Furthermore, the method for providing active power balance services for secondary frequency regulation of the power system based on AGC power command information from the power grid dispatch center RTU and generation power status information sent by the thermal power unit DCS includes:

[0040] The DCS of the thermal power plant's flexible "active power balance" process control system receives AGC power command information sent by the RTU of the power grid dispatch center and power generation status information sent by the DCS of the thermal power unit.

[0041] The DCS (Distributed Control System) for flexible active power balance in thermal power plants analyzes and controls the operation of the thermal power plant's flexible active power balance process system in real time 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 information of the AGC (Automatic Generation Control) frequency regulation in the thermal power unit's DCS. It compares the real-time power generation of the thermal power unit's DCS with the AGC power commands sent by the RTU (Remote Control Unit) of the power grid dispatch center.

[0042] Furthermore, the method of using a flywheel energy storage frequency regulation system, a flywheel energy storage frequency regulation system, and / or a molten salt energy storage frequency regulation system integrated with thermal power units to provide secondary frequency regulation "active power balance" services for the power system based on the AGC target power command of the power grid dispatch center RTU includes:

[0043] When the target power of AGC regulation of the RTU in the power grid dispatch center is less than (real-time frequency regulation power of the flywheel energy storage frequency regulation system + basic regulation rate of the unit × rated power of the unit), the flywheel energy storage frequency regulation system is integrated with the thermal power unit to realize the AGC regulation target power command.

[0044] When the target power of AGC regulation of the RTU in the power grid dispatch center is greater than (real-time frequency regulation power of the flywheel energy storage frequency regulation system + basic regulation rate of the unit × rated power of the unit), the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system are integrated with the thermal power unit to realize the AGC regulation target power command.

[0045] Furthermore, the method for implementing AGC (Automatic Guided Vehicle) regulation target power commands by integrating a flywheel energy storage frequency regulation system with a thermal power unit includes:

[0046] Determine the regulation rate within the full load regulation range of the thermal power unit;

[0047] Determine the remaining percentage of the SOC energy storage system in the flywheel energy storage frequency regulation system;

[0048] Control thermal power units to respond to the AGC adjustment target power command of the RTU of the power grid dispatch center according to their own capabilities;

[0049] The flywheel energy storage frequency regulation energy management system (EMU) adjusts the target power command from the grid dispatch center RTU and the difference between the real-time power generation of the thermal power unit DCS read by the "active power balance" process control system DCS. Based on this difference, the EMU sequentially dispatches and controls the flywheel energy storage device array inverter PCS, the flywheel energy storage device array management system (FMS), the flywheel energy storage device converter FCS, and the flywheel energy storage device to regulate the power generation and consumption.

[0050] Among them, the bus voltage of the flywheel energy storage device array operates at a constant voltage within the rated parameter range, and the charge / discharge rate of the flywheel energy storage device is <2C, where C is the capacity of the flywheel energy storage device.

[0051] Once the output power of the thermal power unit meets the AGC regulation target power command of the power grid dispatch center RTU, the regulating flywheel energy storage frequency regulation system stops outputting power and maintains 50±5% SOC for standby operation.

[0052] Furthermore, the method for implementing AGC (Automatic Generation Control) target power commands by integrating a flywheel energy storage frequency regulation system and a molten salt energy storage frequency regulation system with a thermal power unit includes:

[0053] If the molten salt electric heating device is in operation, then:

[0054] When the difference between the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit and the AGC target power of the power grid dispatch center RTU is less than or equal to the power regulation capability of the molten salt electric heating device under operating conditions, the control method includes: determining that the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit is already operating in a saturated state; treating the molten salt electric heating device as a controllable load, and adjusting the cumulative output power of the molten salt electric heating device combined with the flywheel energy storage frequency regulation system and the thermal power unit to reach the AGC target power of the power grid dispatch center RTU;

[0055] When the difference between the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit and the AGC target power of the grid dispatch center RTU is greater than the power regulation capability of the molten salt electric heating device under operating conditions, the control method includes: determining that the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit is already operating in a saturated state; taking the water-molten salt-steam inverted heat exchange system as a controllable load, and adjusting the cumulative output power of the water-molten salt-steam inverted heat exchange system, the thermal power unit combined with the flywheel energy storage frequency regulation system and the molten salt electric heating device to reach the AGC target power of the grid dispatch center RTU.

[0056] If the molten salt electric heating device is not in operation, then:

[0057] When the target power regulation command of the grid dispatch center RTU increases continuously in one direction, the water-molten salt-steam inverted heat exchange system is controlled to supply the plant / industrial steam system, reducing the steam extraction from the turbine and increasing the power generation; at the same time, the water-molten salt-steam inverted heat exchange system is controlled to supply the main steam system, increasing the main steam inlet flow of the turbine and increasing the power generation.

[0058] When the target power regulation command of the RTU in the power grid dispatch center decreases continuously in one direction, the water-molten salt-steam reverse conversion heat exchange system is controlled to perform molten salt heat storage.

[0059] Furthermore, methods for integrating flywheel energy storage frequency regulation systems and molten salt energy storage frequency regulation systems with thermal power units to form a "virtual frequency regulation power source" for the power grid, providing active power balance services such as rotational inertia, frequency regulation, ramping, and APC peak shaving, include:

[0060] The thermal power plant's flexible "active power balance" process control system (DCS) uploads energy storage capacity-related information from the flywheel energy storage frequency regulation energy management system (EMU) and the molten salt energy storage frequency regulation control system (DCS) to the power grid dispatch center (RTU).

[0061] The power grid dispatch center RTU issues instructions to the thermal power flexible "active power balance" process control system DCS. The thermal power flexible "active power balance" process control system DCS coordinates the operation of the thermal power unit DCS, the dispatch flywheel energy storage frequency regulation energy management system EMU, and the molten salt energy storage frequency regulation control system DCS.

[0062] The target power increase direction adjustment sequence is as follows: the flywheel energy storage frequency regulation system discharges and operates; the molten salt energy storage frequency regulation control system controls the molten salt electric heating device to operate with reduced load; the molten salt energy storage device releases heat in conjunction with the water-molten salt-steam inverted heat exchange system to supply auxiliary main steam to the steam turbine for power generation and to supply plant / industrial steam for heating.

[0063] The target power reduction adjustment sequence is as follows: the flywheel energy storage frequency regulation system discharges and operates; the molten salt energy storage frequency regulation system controls the molten salt electric heating device to operate with reduced load; and the molten salt energy storage device, in conjunction with the water-molten salt-steam inverter heat exchange system, supplies steam turbine auxiliary main steam for power generation and supplies plant / industrial steam for heating.

[0064] The present invention has the following advantages due to the adoption of the above technical solutions:

[0065] (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:

[0066] 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;

[0067] b) High control precision: The response precision of the grid AGC dispatch can be controlled within 0.5% of the unit's rated power or within ±0.5MW of the AGC command power;

[0068] c) Low life cycle cost: The flywheel energy storage system has an operating life of >20 years, which is the same as the life of the main equipment of the thermal power unit.

[0069] d) Facilitates intelligent management and control: It enables unmanned operation, precise control, intelligent management and control, and smart operation through data and networking.

[0070] (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.

[0071] 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.

[0072] (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 thermal power 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.

[0073] 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.

[0074] (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.

[0075] In summary, the multi-source coordinated active power balance process system for thermal power plant 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 exchange 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 the "water-molten salt-steam inverse heat exchange 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 rotational inertia, frequency regulation, peak shaving, and ramping active power balance services to the power system. Therefore, this invention can be widely applied in the fields of flywheel energy storage, molten salt energy storage, thermal power plant 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

[0076] Figure 1 This is a topology diagram of a flexible multi-source coordinated "active power balance" process system for thermal power plants provided in an embodiment of the present invention;

[0077] 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;

[0078] 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;

[0079] Figure 4 This is a comparison chart of the primary frequency regulation effect of thermal power unit-flywheel energy storage according to an embodiment of the present invention;

[0080] The labels for the attached figures are as follows:

[0081] 1. Power grid dispatch center RTU (Remote Terminal Unit), also known as remote terminal control system;

[0082] 2. Power grid;

[0083] 3. Power plant switchyard busbar; 3-1. Power plant switchyard busbar 1; 3-2. Power plant switchyard busbar 2;

[0084] 4. Power plant switchboard and bus tie switch;

[0085] 5. Power plant PMU (Phasor Measurement Unit), the full Chinese name is Phasor Measurement Unit;

[0086] 6. DCS (Distributed Control Systems) of thermal power units, the full Chinese name is Distributed Control Systems;

[0087] 7. Power supply transformer of molten salt electric heating device;

[0088] 8. Steam turbine generator set;

[0089] 9. Outlet transformer of steam turbine generator;

[0090] 10. Auxiliary transformer;

[0091] 11. Auxiliary 6kV busbar; 11-1, Auxiliary 6kV busbar 1A section; 11-2, Auxiliary 6kV busbar 1B section;

[0092] 12. Disconnector of auxiliary 6kV busbar; 12-1, Disconnector of auxiliary 6kV busbar 1A section; 12-2, Disconnector of auxiliary 6kV busbar 1B section;

[0093] 13. Tie switch of auxiliary 6kV busbar;

[0094] Flywheel energy storage frequency modulation system

[0095] 14. Busbar of flywheel energy storage frequency modulation system;

[0096] 15. Disconnector of busbar of flywheel energy storage frequency modulation system; 15-1, Disconnector between busbar of flywheel energy storage frequency modulation system and auxiliary 6kV busbar 1A section, 15-2, Disconnector between busbar of flywheel energy storage frequency modulation system and auxiliary 6kV busbar 1B section;

[0097] 16. Unit transformer of flywheel energy storage frequency modulation system;

[0098] 17. DCS of thermal power flexibility "active power balance" process control system;

[0099] 18. Flywheel energy storage frequency modulation energy management system EMU (electric multiple units);

[0100] 19. DCS of molten salt energy storage frequency modulation control system;

[0101] 20. Disconnector for power supply and consumption of unit of flywheel energy storage frequency modulation system;

[0102] 21: Busbar of unit of flywheel energy storage frequency modulation system;

[0103] 22. Busbar of flywheel energy storage device array;

[0104] 23. Flywheel energy storage device array inverter PCS;

[0105] 24. Flywheel Management System (FMS) for Flywheel Energy Storage Device Array Management System;

[0106] 25. Flywheel Conversion System (FCS) for energy storage devices.

[0107] 26. Flywheel energy storage device;

[0108] Molten salt electric heating device:

[0109] 27. Molten salt electric heater;

[0110] 28. Power supply transformer incoming switch for molten salt electric heating device;

[0111] 29. Power supply isolating switch for molten salt electric heating device;

[0112] 30. Isolating switch for power supply to molten salt electric heater;

[0113] Molten salt energy storage device

[0114] 31. Cold salt container;

[0115] 32. Hot salt container;

[0116] 33. Cold salt pump;

[0117] 34. Cold salt pump salt supply gate;

[0118] 35. Isolation door for cold salt supply in molten salt electric heating device;

[0119] 36. Cold salt feed isolation door of the "water-molten salt-steam reverse heat exchanger";

[0120] 37. Cold salt return isolation door of the "water-molten salt-steam reverse heat exchanger";

[0121] 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;

[0122] 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".

[0123] 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;

[0124] 41. T-junction for the outlet pipeline of the cold salt pump;

[0125] 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;

[0126] 43. Hot salt pump;

[0127] 44. Salt supply valve at the outlet of the hot salt pump;

[0128] 45. Hot salt container return salt gate;

[0129] 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;

[0130] 47. "Water-molten salt-steam reverse heat exchange device";

[0131] 48. Isolation door for hot salt outlet of "Water-molten salt-steam reverse heat exchange device";

[0132] 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;

[0133] 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";

[0134] 51. Isolation door for hot salt supply in molten salt electric heating device;

[0135] 52. Boiler;

[0136] 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;

[0137] 54. High-pressure bypass valve for steam turbine;

[0138] 55. High-pressure bypass valve outlet isolation gate for steam turbine;

[0139] 56. High-pressure bypass steam supply isolation door;

[0140] 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; 57-3. Steam inlet regulating valve for low-pressure cylinder of steam turbine;

[0141] 58. Steam turbine high-pressure heater feedwater system;

[0142] 59. Low-pressure feedwater pump for the "water-molten salt-steam reverse heat exchange device";

[0143] 60. Low-pressure feedwater isolation valve for the "water-molten salt-steam reverse heat exchanger";

[0144] 61. Isolation valve at the outlet of the boiler high-pressure feedwater pump;

[0145] 62. High-pressure feedwater inlet isolation valve of the "water-molten salt-steam reverse heat exchanger";

[0146] 63. Drainage isolation door for the "water-thermal salt-steam reverse heat exchange device";

[0147] 64. Drainage regulating valve of "Water-Hot Salt-Steam Reverse Heat Exchanger";

[0148] 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.

[0149] 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".

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 70. Steam turbine high-pressure bypass valve inlet steam isolation door;

[0154] 71. Steam inlet isolation valve of the auxiliary main steam high-pressure bypass pipeline of the steam turbine;

[0155] 72. Steam turbine low-pressure bypass valve inlet steam isolation door;

[0156] 73. Isolation valve for steam extraction pipeline in the reheat section of the bypass turbine;

[0157] 74. Bypass turbine main steam extraction pressure regulating valve;

[0158] 75. Steam turbine low-pressure bypass valve outlet isolation valve;

[0159] 76. Isolation door for plant / industrial steam pipeline of "water-molten salt-steam reverse heat exchange device";

[0160] 77. "Water-molten salt-steam reverse heat exchanger" steam desuperheating supply for plant / industrial steam isolation door;

[0161] 78. "Water-molten salt-steam reverse heat exchanger" for plant / industrial steam check valve;

[0162] 79. Steam inlet header of the "water-molten salt-steam reverse heat exchanger";

[0163] 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;

[0164] 81. The bypass turbine main steam extraction pipeline of the "water-molten salt-steam reverse heat exchanger" and the tee interface of the bypass turbine main steam extraction pipeline to the inlet pipeline interface of the "water-molten salt-steam reverse heat exchanger" steam inlet header;

[0165] 82. The bypass turbine reheat hot section steam extraction pipeline, the pipeline between the tee interface of the turbine reheat hot section steam extraction pipeline and the steam inlet header interface of the "water-molten salt-steam reverse heat exchanger";

[0166] 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;

[0167] 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;

[0168] 85. Low-pressure bypass valve for steam turbine;

[0169] 86. Boiler feedwater deaerator;

[0170] 87. Boiler feed water pump;

[0171] 88. The "water-molten salt-steam reverse heat exchange device" supplies auxiliary main steam isolation doors;

[0172] 89. Isolation valve for the steam inlet header of the "water-molten salt-steam reverse heat exchanger";

[0173] 90. T-junction for auxiliary main steam inlet pipeline of high-pressure bypass of steam turbine;

[0174] 91. Bypass turbine main steam extraction pipeline: Bypass turbine main steam extraction pipeline tee;

[0175] 92. Check valve on the steam extraction pipeline of the reheat section of the bypass turbine;

[0176] 93. Tee for extraction steam pipeline in the reheat section of the steam turbine;

[0177] 94. Molten salt heat release and steam desuperheating supply tee for plant / industrial steam pipelines;

[0178] 95. T-junction for high-pressure feedwater pipeline of boiler in "water-molten salt-steam reverse heat exchange device";

[0179] 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;

[0180] 97. T-junction for the main steam pipe from the steam turbine to the high-pressure bypass steam pipe;

[0181] 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.

[0182] 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;

[0183] 100. Steam pipeline for low-pressure bypass of steam turbine. Detailed Implementation

[0184] 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.

[0185] 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.

[0186] 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.

[0187] The structure or technical terminology involved in this invention will be further explained below.

[0188] "Active power balance" includes auxiliary power services such as frequency regulation, peak shaving, ramping, moment of inertia, and reserve. Among them:

[0189] 1) Frequency modulation

[0190] 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.

[0191] 2) Peak shaving

[0192] 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.

[0193] 3) Climbing a hill

[0194] 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.

[0195] 4) Moment of inertia

[0196] 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.

[0197] 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.

[0198] Example 1

[0199] like Figures 1-3 As 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 monitoring and control system.

[0200] 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.

[0201] 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 3 and 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 device" via a hot salt supply pipeline 49 and a hot salt return pipeline 46. The "water-molten 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 tank 31 through the cold salt supply pipeline 39 of the "water-molten salt-steam reverse heat exchange device" and the cold salt return pipeline 40 of the "water-molten salt-steam reverse heat exchange device" is connected to the cold salt tank 31.

[0202] The thermal power flexibility "active power balance" process monitoring and control system 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 thermal power units or power systems.

[0203] In the above embodiments, preferably, as shown below, Figure 2As 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.

[0204] In the above embodiments, preferably, the other side of the 6kV busbar 11 of the generating unit is connected to the power grid 2 through the 6kV busbar disconnecting switch 12, the generating unit transformer 10, the turbine generator set outlet transformer 9, and the power plant switch busbar 3.

[0205] 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.

[0206] 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.

[0207] Each flywheel energy storage array inverter PCS 23 is also 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. It includes a flywheel energy storage converter FCS 25 and a flywheel energy storage device 26. 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 converter FCS 25, and each flywheel energy storage converter FCS 25 controls one flywheel energy storage device 26.

[0208] In the above embodiments, preferably, as shown below, Figure 3As 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 7, 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 7 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.

[0209] 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 is equipped with a cold salt return valve 37. The hot salt supply pipeline of the hot salt tank 32 is equipped with a hot salt pump 43 and a hot salt pump outlet supply valve 44, which are connected to the hot salt supply pipeline 50. 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.

[0210] Specifically, the cold salt supply system of the molten salt electric heating device includes a cold salt tank 31, and pipelines and equipment connecting the cold salt tank 31 to the molten salt electric heating device via a cold salt supply pipeline 42 and a cold salt supply pipeline 38. The cold salt supply pipeline 42 is equipped with a cold salt pump 33, a cold salt pump feed valve 34, and a cold salt pump feed valve outlet tee 41. The cold salt supply pipeline 38 of the molten salt electric heating device is equipped with a cold salt supply isolation valve 35.

[0211] The hot salt supply system of the molten salt electric heating device includes a "water-molten salt-steam reverse heat exchange device" 47 and its pipeline equipment connected to the molten salt electric heating device via a hot salt supply pipeline 49. The hot salt supply pipeline 49 of the molten salt electric heating device is equipped with a hot salt outlet isolation gate 48 of the "water-molten salt-steam reverse heat exchange device" and a hot salt supply isolation gate 51 of the molten salt electric heating device.

[0212] Hot salt return system of molten salt electric heating device: includes molten salt electric heating device and hot salt return pipeline 46 of molten salt electric heating device into hot salt tank 32, and hot salt return pipeline 46 is provided with hot salt tank return door 45.

[0213] In the above embodiments, preferably, the water-molten salt-steam reverse heat exchange system includes, in addition to the "water-molten salt-steam reverse heat exchange device" 47 which has both molten salt heat release and heat absorption bidirectional heat exchange functions, a molten salt thermal storage auxiliary peak shaving system and a molten salt heat release auxiliary peak shaving system; wherein, 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 hot section steam extraction system, a steam desuperheating and plant / industrial steam supply system, and a "water-molten salt-steam reverse heat exchange device" drainage system; the molten salt heat release auxiliary peak shaving system includes a "water-molten salt-steam reverse heat exchange device" high-pressure feedwater system, a molten salt heat release and main steam supply system, a molten salt heat release and plant / industrial steam supply system, and a "water-molten salt-steam reverse heat exchange device" low-pressure feedwater system.

[0214] 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 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 hot section steam extraction system, the steam desuperheating supply plant / industrial steam system, the molten salt heat release supply main steam system, and the molten salt heat release supply plant / industrial steam system; the water-side pipeline is connected to the "water-molten salt-steam reverse heat exchange device" high-pressure feedwater system, the "water-molten salt-steam reverse heat exchange device" low-pressure feedwater system, and the "water-molten salt-steam reverse heat exchange device" condensate system.

[0215] The bypass turbine main steam pressure reduction and steam supply system, the bypass turbine reheat hot section steam extraction system and the "water-molten salt-steam reverse heat exchange device" 47 are used 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.

[0216] The bypass turbine main steam pressure reduction and steam supply system, the bypass turbine reheat hot section steam extraction 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 realize molten salt heat absorption and storage, and deep peak shaving of the unit.

[0217] The existing boiler high-pressure feedwater system, the "water-molten salt-steam reverse heat exchange device" high-pressure feedwater system, the molten salt heat release main steam supply system and the "water-molten salt-steam reverse heat exchange device" 47 are used to realize molten salt heat release and economic operation of the unit;

[0218] 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.

[0219] 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.

[0220] In the above embodiments, preferably, the bypass turbine main steam pressure reduction and steam supply system includes: a high-pressure bypass steam pipeline tee (97) installed between the existing boiler 52 of the thermal power unit and the main steam pipeline (96) of the turbine; the other end of the turbine main steam to the high-pressure bypass steam pipeline tee 97 enters the turbine high-pressure bypass steam pipeline 99 and the turbine high-pressure bypass valve inlet isolation gate 70 installed thereon via the turbine high-pressure bypass auxiliary main steam inlet pipeline tee (90); a bypass turbine main steam extraction pipeline tee 91 and the "water-molten salt-steam reverse heat exchange device" bypass turbine main steam extraction pipeline 81 are installed at the end of the turbine high-pressure bypass steam pipeline 99, which is connected to the "water-molten salt-steam reverse heat exchange device" 47. The steam inlet header 79 is connected to the main steam extraction pipeline of the bypass turbine of the "water-molten salt-steam reverse heat exchange device". A high-pressure bypass steam supply isolation valve 56 and a bypass turbine main steam extraction pressure regulating valve 74 are installed on the main steam extraction pipeline tee 91 of the bypass turbine. The other end of the pipeline is connected to the existing turbine high-pressure bypass valve 54 and a high-pressure bypass valve outlet isolation valve 55 is installed. The other end of the existing turbine main steam pipeline 96 is connected to the boiler 52 via the turbine main steam to the high-pressure bypass steam pipeline tee 97.

[0221] In the above embodiments, preferably, the bypass turbine reheat hot section steam extraction 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 are connected to the inlet header pipe 79 of the "water-molten salt-steam reverse heat exchange device". A turbine reheat hot section is installed on the bypass turbine reheat hot section steam supply pipeline 82. The bypass 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.

[0222] Among them, attention should be paid to the setting of the steam extraction system of the reheat section of the bypass turbine. The selection of the reheat steam supply flow rate of the bypass turbine 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.

[0223] In the above embodiments, preferably, the steam desuperheating supply system for plant / industrial steam includes a steam desuperheating supply pipeline 83 connected to the steam desuperheater built into the "water-molten salt-steam reverse heat exchange device" 47. The steam desuperheating supply pipeline 83 is connected to an existing plant / industrial steam pipeline via a tee 94 for molten salt heat release and steam desuperheating supply pipeline for plant / industrial steam. A check valve 78 for the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam is installed on the plant / industrial steam pipeline.

[0224] 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".

[0225] 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.

[0226] In the above embodiments, preferably, the molten salt heat release system for supplying main steam includes an auxiliary main steam supply pipeline 80 of the "water-molten salt-steam reverse heat exchanger" (which is led out from the steam outlet pipeline interface of the "water-molten salt-steam reverse heat exchanger"), an auxiliary main steam isolation valve 88, and an inlet isolation valve 71 of the turbine auxiliary main steam high-pressure bypass pipeline. The other end of the inlet isolation valve 71 of the turbine auxiliary main steam high-pressure bypass pipeline is connected to a tee 90 of the turbine high-pressure bypass auxiliary main steam inlet pipeline. The tee 90 of the turbine high-pressure bypass auxiliary main steam inlet pipeline enters the turbine high-pressure cylinder inlet regulating valve 57-1 through the existing turbine high-pressure bypass steam pipeline 99, the turbine high-pressure bypass valve inlet isolation valve 70, and the turbine main steam pipeline 96. The turbine high-pressure bypass steam pipeline 99 at the other end of the bypass turbine main steam extraction pipeline tee 91 is connected to the existing turbine high-pressure bypass valve 54, and the 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.

[0227] 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".

[0228] 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.

[0229] 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 1, a power plant PMU 5, a thermal power unit DCS 6, 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.

[0230] 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 1, the unit's DCS 6, 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 5 is connected to the grid dispatch center's remote terminal control system RTU 1, the unit's DCS 6, and the flywheel energy storage frequency regulation energy management system EMU 18.

[0231] Specifically, the thermal power flexible "active power balance" process control system DCS 17 receives the power dispatching instructions from the grid dispatch center RTU 1AGC and the power generation information from the unit DCS 6. 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, and 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 balancing 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, to achieve "active power balance service" for thermal power units or the power system.

[0232] 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:

[0233] 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.

[0234] 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;

[0235] 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;

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] The functions of steam-heated cold salt, electric-heated hot salt heat absorption, and energy storage are achieved through the coordinated operation 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, water-molten salt-steam reverse heat exchange device cold salt supply isolation valve 36, water-molten salt-steam reverse heat exchange device 47, water-molten salt-steam reverse heat exchange device hot salt outlet isolation valve 48, molten salt electric heating device hot salt supply pipeline 49, 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, 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.

[0242] 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.

[0243] 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.

[0244] 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 auxiliary main steam high-pressure bypass pipeline 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.

[0245] 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 fed 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" bypass turbine main steam extraction pipeline 81, and its high-pressure bypass steam supply isolation gate 5. 6 and the bypass turbine main steam extraction 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, one of which 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, close the steam inlet isolation valve 71 of the auxiliary main steam 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 steam supply pipeline isolation valve 73 of the bypass steam supply pipeline of the reheat hot section of the steam turbine, the auxiliary main steam supply isolation valve 88 and the plant / industrial steam supply pipeline isolation valve 76 of the "water-molten salt-steam reverse heat exchange device", the steam inlet header 79 of the "water-molten salt-steam reverse heat exchange device" and the plant / industrial steam supply pipeline isolation valve 76 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.

[0246] 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.

[0247] 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 bypass turbine main steam extraction 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 extraction 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 steam inlet isolation valve 71 of the auxiliary main steam 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 steam supply pipeline isolation valve 73 of the bypass pipeline of the reheat hot section of the steam turbine, the steam desuperheating supply / industrial steam isolation valve 77 of the "water-molten salt-steam reverse heat exchange device", the auxiliary main steam supply isolation valve 88 and the supply / industrial steam pipeline isolation valve 76, the low-pressure feedwater isolation valve 60 and the high-pressure feedwater inlet isolation valve 62 of the "water-molten salt-steam reverse heat exchange device", and achieve the heat storage of the energy storage device.

[0248] 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.

[0249] Example 2

[0250] Based on the thermal power flexible multi-source coordinated "active power balance" process system provided in Embodiment 1, this embodiment takes the flywheel energy storage frequency regulation system providing rotational inertia and / or primary frequency regulation active power balance service as an example to introduce the application method of the thermal power flexible multi-source coordinated "active power balance" process system.

[0251] 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 categories:

[0252] The first category involves a flywheel energy storage frequency regulation system that replaces the primary frequency regulation function of conventional thermal power units based on power information transmitted by the power plant's PMU.

[0253] 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 flywheel energy storage array energy information from the flywheel energy storage array inverter PCS 23.

[0254] 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 5 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.

[0255] 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.

[0256] 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.

[0257] The second type is based on the dispatch power command sent by the power grid dispatch center RTU. The flywheel energy storage frequency regulation system independently provides the power grid with auxiliary services such as rotational inertia and primary frequency regulation "active power balance".

[0258] Includes the following steps

[0259] 1) The power dispatching unit 1 sends the dispatching power command to the thermal power flexible "active power balance" process control system DCS 17 or directly to the flywheel energy storage frequency regulation energy management system EMU 18.

[0260] 2) After receiving the AGC dispatch power command from the thermal power flexible "active power balance" process control system DCS17 or the grid dispatch center RTU 1, 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 PCS23.

[0261] 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.

[0262] 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.

[0263] like Figure 4The figure shows a comparison of the effects of primary frequency regulation of thermal power units and the replacement of primary frequency regulation of thermal power units by a flywheel energy storage frequency regulation system. As can be seen from the figure, the flywheel energy storage frequency regulation system's response time from 0-100% target power is less than 200 milliseconds. The charging and discharging power and stored energy of the flywheel energy storage frequency regulation system can reduce the amplitude of grid frequency changes in the initial stage of power system faults (within 2-10 seconds), increasing the frequency at the lowest point or decreasing the frequency at the highest point in the initial stage of grid faults. Compared with conventional thermal power units, the flywheel energy storage frequency regulation system has the characteristics of constant power rapid 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 power system faults.

[0264] ① Requirements of section 5.3.1 in the "Guidelines for Primary Frequency Regulation Test and Performance Acceptance of Thermal Power Generating Units" (GB / T 30370—2013):

[0265] a) The response lag time of the unit participating in primary frequency regulation should be less than 3 seconds.

[0266] b) The time for a coal-fired unit to reach 75% of the target load should not exceed 15 seconds.

[0267] c) The time for a coal-fired unit to reach 90% of the target load should not exceed 30 seconds.

[0268] d) The stabilization time of the unit participating in primary frequency regulation should be less than 1 minute.

[0269] ② Taking a 350MW thermal power unit as an example, it is difficult to meet the requirements of the guidelines below 50% load. The primary frequency regulation dynamic performance in the 50%-85% rated load range is as follows:

[0270] a) The response lag time of the unit participating in primary frequency regulation is usually greater than 2 seconds.

[0271] b) The average settling time of active power is typically >30s;

[0272] c) The time for coal-fired power units to reach 75% of the target load is usually greater than 15 seconds;

[0273] d) The time for a coal-fired unit to reach 90% of its target load should not exceed 30 seconds;

[0274] e) The stabilization time of the unit participating in primary frequency regulation is >1 minute.

[0275] Assuming a rotational speed unequal rate of 5%, the theoretical power / frequency adjustment is approximately 1.165 MW / r / min, or 2.33 MW / 0.0165 Hz, or 14 MW / 0.1 Hz.

[0276] ③ Example of main technical parameter configuration for flywheel energy storage frequency regulation system:

[0277] According to the primary frequency regulation limit standard in Article 5.3 of GB / T40595-2021 "Technical Specifications and Test Guidelines for Primary Frequency Regulation of Grid-Connected Power Supply", taking a 350 MW thermal power unit as an example, the primary frequency regulation power variation range should not be less than ±8% of the rated active power. Technical parameters configuration of the flywheel energy storage frequency regulation system:

[0278] Rated: Charge / discharge power 28 MW; Charge / discharge rate 2C; Energy storage time 6 min; Primary frequency modulation delay <200 milliseconds;

[0279] Note: C represents the charge / discharge rate of the energy storage system, which is the ratio of the current magnitude during charging and discharging of the energy storage system, usually represented by the letter C. For example, if an energy storage system can discharge completely in 1 hour at its rated energy storage capacity, it is called 1C discharge; if it can discharge completely in 0.5 hours, it is called 2C discharge.

[0280] 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.

[0281] When thermal power units operate using AGC control, short-duration, and frequently reversible AGC dispatch commands (on the order of seconds) can negatively impact the quality of primary frequency regulation due to the unit's inertial response delay. This can even lead to secondary frequency regulation frequently reversing from primary frequency regulation. Replacing primary frequency regulation with a flywheel energy storage frequency regulation system can be achieved by installing primary frequency regulation activation / deactivation buttons in the unit control system (e.g., DCS 6 for thermal power units). When the flywheel energy storage frequency regulation system is in operation, the primary frequency regulation function in the unit control system is deactivated, effectively preventing 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 control system and CCS coordinated control system.

[0282] Example 3

[0283] Based on the thermal power flexible multi-source coordinated "active power balance" process system provided in Embodiment 1, this embodiment takes the use of a flywheel energy storage frequency regulation system, a flywheel energy storage frequency regulation system and / or a molten salt energy storage frequency regulation system integrated with a thermal power unit to provide secondary frequency regulation active power balance services for the power system as an example to introduce the application method of the thermal power flexible multi-source coordinated "active power balance" process system.

[0284] 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).

[0285] This embodiment can be divided into two categories:

[0286] The first category provides "active power balance" services for secondary frequency regulation of the power system based on the AGC adjustment target power command information of the power grid dispatch center RTU and the power generation status information sent by the DCS of thermal power units.

[0287] The main steps include:

[0288] 1) The "flexible operation and active power balance" process control system DCS 17 of thermal power plants receives AGC power target instruction information sent by RTU 1 of the power grid dispatch center and power generation status information of thermal power units sent by DCS 6 of the thermal power units;

[0289] 2) The "active power balance" process control system DCS 17 for thermal power flexibility uses real-time data 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 AGC frequency regulation of the thermal power unit DCS 6. It compares and analyzes the quality of the thermal power unit DCS 6's power generation to the grid dispatch center RTU 1 AGC dispatch power command, and adaptively dispatches and controls the "power generation and consumption" operation of the thermal power flexibility multi-source coordinated "active power balance" process system.

[0290] The second category: Based on the AGC adjustment target power command of the power grid dispatch center RTU, the secondary frequency regulation "active power balance" service of the power system is provided by integrating the flywheel energy storage frequency regulation system, the flywheel energy storage frequency regulation system and / or the molten salt energy storage frequency regulation system with the thermal power unit.

[0291] Taking the statistical coverage data of AGC dispatch power / duration frequency regulation commands of a certain 330MW thermal power unit as an example:

[0292] AGC single frequency adjustment command: the percentage of target power ≤ 18MW (5.5% of rated power) is > 97%, and the percentage of duration ≤ 6min is ≥ 91%; AGC single-direction continuous adjustment commands of two or more: 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%.

[0293] Therefore, this embodiment applies the target power value adjustment by the RTU 1 AGC of the power grid dispatch center in two scenarios:

[0294] Scenario 1: The target power of the grid dispatch center RTU 1 AGC regulation is less than (8% of the unit's rated power + the unit's basic regulation rate × the unit's rated power).

[0295] At this point, the application of a flexible multi-source coordinated "active power balance" process system for thermal power, which combines a flywheel energy storage frequency regulation system with AGC frequency regulation of thermal power units, includes the following steps:

[0296] 1) Determine the regulation rate within the full load regulation range of the thermal power unit;

[0297] 2) Determine the SOC (state of charge) percentage of the remaining energy in the flywheel energy storage frequency regulation system;

[0298] 3) Thermal power units respond to the grid dispatch center's RTU 1 AGC adjustment of target power according to their own capabilities;

[0299] 4) The flywheel energy storage frequency regulation energy management system EMU 18, based on the difference between the target power adjustment command from the grid dispatch center RTU 1 AGC and the real-time power generation of the thermal power unit DCS 6 read by the thermal power flexibility "active power balance" process control system DCS 17, 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.

[0300] 5) First, adjust the voltage of the flywheel energy storage array bus 22 to constant voltage operation within the rated parameter range, and adjust the charge and discharge rate of the flywheel energy storage device 26 to ≤2C. When the output power of the thermal power unit meets the target power accuracy requirements of the grid dispatch center RTU 1 AGC, the flywheel energy storage frequency regulation system stops outputting power and usually maintains 50±5% SOC for standby operation.

[0301] The second scenario: The target power of the grid dispatch center RTU 1 AGC regulation is greater than (8% of the unit's rated power + the unit's basic regulation rate × the unit's rated power).

[0302] 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;

[0303] First type: Molten salt energy storage frequency regulation system in hot standby mode, molten salt electric heating device in operation:

[0304] 1) The power regulation capability of the flywheel energy storage frequency regulation system combined with the cumulative grid-connected power of the thermal power unit and the target power regulated by the grid dispatch center RTU 1 AGC is less than or equal to the power regulation capability of the molten salt electric heating device under operating conditions. Main application methods:

[0305] ① It has been determined that the combined power output of the flywheel energy storage frequency regulation system and the thermal power unit has reached saturation.

[0306] ②Use the molten salt electric heating device as a controllable load, and adjust the molten salt electric heating device in conjunction with the flywheel energy storage frequency regulation system and the thermal power unit to achieve the target power of the RTU 1 AGC of the power grid dispatch center;

[0307] ③ The power adjustment sequence of the RTU 1 AGC in response to the power grid dispatch center is as follows: the generator power of the thermal power unit DCS 6, the power generation and consumption of the flywheel energy storage frequency regulation system EMU 18, and the power consumption of the molten salt energy storage frequency regulation control system DCS 19.

[0308] 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 1 AGC is greater than the regulation capacity of the molten salt electric heating device under operating conditions. Main application methods:

[0309] ① The combined power generation of the flywheel energy storage and molten salt electric heating unit has reached saturation.

[0310] ② The “water-molten salt-steam reverse heat exchange system” is used as a controllable load. The cumulative output power of the “water-molten salt-steam reverse heat exchange device” 47 integrated thermal power units combined with the flywheel energy storage frequency regulation system and the molten salt electric heating device is adjusted to reach the target power of the grid dispatch center RTU 1 AGC.

[0311] ③ The power adjustment sequence of the RTU 1 AGC in response to the power grid dispatch center is as follows: the DCS 6 of the thermal power unit adjusts the generator power; the EMU 18 of the flywheel energy storage frequency regulation energy management system adjusts the power generation / consumption of the flywheel energy storage device 26; the DCS 19 of the molten salt energy storage frequency regulation control system controls the steam turbine extraction / supply flow in the "water-molten salt-steam inverse heat exchange system" and adjusts the power load of the "molten salt electric heating device".

[0312] 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.

[0313] When the peak-to-valley difference in the power grid is large and the power generation of new energy sources fluctuates significantly, the RTU 1 AGC adjustment commands from the power grid dispatch center continuously increase or decrease 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 1 AGC adjustment from the power grid dispatch center:

[0314] 1) Increase power

[0315] 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;

[0316] 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.

[0317] 2) Reduce power

[0318] ① The water-molten salt-steam reverse heat exchange system uses bypass main steam or reheat hot section steam to heat molten salt for heat storage, and drains the water to the deaerator;

[0319] ② The water-molten salt-steam reverse conversion heat exchange system simultaneously bypasses the main steam and reheat hot section steam to heat the molten salt for heat storage, and drains the water to the deaerator.

[0320] The second type is not suitable for minute-level frequency regulation 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 1 AGC adjustment commands to continuously increase or decrease in one direction and the target power of dispatching changes significantly. The initial steam extraction and steam supply turnaround time should be ≥1 hour, and special attention should be paid to the operation of steam system drainage and steam connection.

[0321] The main technical parameters of the molten salt energy storage frequency regulation system include:

[0322] Molten salt electric heater power: ≥20% of the unit's rated power;

[0323] Molten salt electric heating energy storage system 0-100% rated power adjustment time: <5 min;

[0324] Molten salt energy storage: ≥20% of the unit's rated power (MW) × 7 hours;

[0325] Molten salt heat release main steam flow rate: ≥15%B-MCRt / h;

[0326] Adjustment time for molten salt heat release to supply main steam flow rate from 0-100% of rated output: <5min.

[0327] Example 4

[0328] Based on the thermal power flexible multi-source coordinated "active power balance" process system provided in Embodiment 1, this embodiment provides a thermal power flexible multi-source coordinated "active power balance" 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 balance services" for the power system and new energy units. The application method is as follows:

[0329] 1) The "active power balance" process control system DCS 17 for thermal power plants will upload information related to the available power, regulation performance, and energy storage capacity of the flywheel energy storage frequency regulation energy management system EMU18 and the molten salt energy storage frequency regulation control system DCS 19 to the grid dispatch center RTU 1 according to grid requirements;

[0330] 2) The power grid dispatch center RTU 1 sends (APC) automatic power control commands to the thermal power flexibility "active power balance" process 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 to provide rotational inertia and primary frequency regulation services for the power system.

[0331] 3) The power grid dispatch center RTU 1 issues an Automatic Power Control (APC) command to the thermal power plant's "flexible active power balance" process control system DCS 17, wherein:

[0332] 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;

[0333] 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.

[0334] Specifically, the method for adjusting the direction of target power reduction is as follows:

[0335] a. The flywheel energy storage frequency regulation system is charging and operating;

[0336] b. Based on the peak-shaving capacity requirements, the molten salt energy storage frequency regulation control system controls the "water-molten salt-steam inverted heat exchange system" to sequentially select the bypass turbine main steam pressure reduction steam supply system + bypass turbine reheat steam supply system; bypass turbine main steam pressure reduction steam supply system; bypass turbine reheat steam supply system; condensate to deaerator; molten salt energy storage device heat storage; molten salt electric heating device operation;

[0337] c. Based on peak-shaving capacity requirements and plant / industrial steam heating needs, the molten salt energy storage frequency regulation control system controls the "water-molten salt-steam reverse heat exchange system" to sequentially select: bypass turbine main steam pressure reduction supply system + bypass turbine reheat steam supply system; bypass turbine main steam pressure reduction supply system; bypass turbine reheat steam supply system; steam desuperheating of the "water-molten salt-steam reverse heat exchange device" for plant / industrial steam; heat storage of the molten salt energy storage device; and operation of the molten salt electric heating device.

[0338] d. The above-mentioned methods b and c can also be flexibly combined and adjusted for operation.

[0339] e. Molten salt electric heating device and molten salt energy storage device for heat storage operation.

[0340] 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. An application method for a flexible multi-source coordinated "active power balance" process system in thermal power plants, characterized in that, Includes the following steps: Set up a flexible multi-source coordinated "active power balance service" process system for thermal power, which includes a flywheel energy storage frequency regulation system, a molten salt energy storage frequency regulation system, and a flexible "active power balance" process control system for thermal power. Control the flywheel energy storage frequency regulation system to provide active power balance services for the rotational inertia or primary frequency regulation of thermal power plants; The flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system are integrated with the thermal power unit to provide multi-source coordinated "active power balance" service; The aforementioned integration of flywheel energy storage frequency regulation system and molten salt energy storage frequency regulation system with thermal power units to provide multi-source coordinated "active power balance" service includes: Based on the AGC adjustment target power command information from the RTU of the power grid dispatch center and the power generation status information sent by the DCS of the thermal power unit, the power system provides the "active power balance" service for secondary frequency regulation. Based on the AGC target power command of the power grid dispatch center RTU, the secondary frequency regulation "active power balance" service of the power system is provided by integrating the flywheel energy storage frequency regulation system, the flywheel energy storage frequency regulation system and / or the molten salt energy storage frequency regulation system with the thermal power unit. By integrating flywheel energy storage frequency regulation system and molten salt energy storage frequency regulation system with thermal power units to form a "virtual frequency regulation power source" for the power grid, it provides power system rotational inertia, frequency regulation, ramping, deep peak shaving or APC "active power balance" services; The method of using a flywheel energy storage frequency regulation system and a molten salt energy storage frequency regulation system integrated with thermal power units to form a "virtual frequency regulation power source" for the power grid, providing active power balance services such as rotational inertia, frequency regulation, ramping, and APC peak shaving, includes: The thermal power plant's flexible "active power balance" process control system (DCS) uploads energy storage capacity-related information from the flywheel energy storage frequency regulation energy management system (EMU) and the molten salt energy storage frequency regulation control system (DCS) to the power grid dispatch center (RTU). The power grid dispatch center RTU issues instructions to the thermal power flexible "active power balance" process control system DCS. The thermal power flexible "active power balance" process control system DCS coordinates the operation of the thermal power unit DCS, the dispatch flywheel energy storage frequency regulation energy management system EMU, and the molten salt energy storage frequency regulation control system DCS. The target power increase direction adjustment sequence is as follows: the flywheel energy storage frequency regulation system discharges and operates; the molten salt energy storage frequency regulation control system controls the molten salt electric heating device to operate with reduced load; the molten salt energy storage device releases heat in conjunction with the water-molten salt-steam inverted heat exchange system to supply auxiliary main steam to the steam turbine for power generation and to supply plant / industrial steam for heating. The target power reduction adjustment sequence is as follows: the flywheel energy storage frequency regulation system discharges and operates; the molten salt energy storage frequency regulation system controls the molten salt electric heating device to operate with reduced load; and the molten salt energy storage device, in conjunction with the water-molten salt-steam inverter heat exchange system, supplies steam turbine auxiliary main steam for power generation and supplies plant / industrial steam for heating.

2. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 1, characterized in that, 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 switchyard busbar. It is connected to the molten salt energy storage device via a cold salt supply pipeline and a hot salt return pipeline. The salt-side pipeline of the "water-molten salt-steam reverse heat exchange device" is connected to the molten salt energy storage device via a cold salt supply pipeline, and to the molten salt electric heating device via a hot salt supply pipeline. After secondary heating by the molten salt electric heating device, it is connected to the molten salt energy storage device via a hot salt return pipeline. 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. All flywheel energy storage frequency regulation units are connected in parallel to the busbar of the flywheel energy storage frequency regulation system and connected to the 6kV power supply busbar via the busbar disconnector of the flywheel energy storage frequency regulation system. Each flywheel energy storage frequency regulation unit contains one or more sets of flywheel energy storage device array inverters (PCS). The flywheel energy storage device array inverters (PCS) are connected to the flywheel energy storage frequency regulation unit busbar via an AC disconnector of the flywheel energy storage device array inverters. Each flywheel energy storage array inverter is connected to one or more flywheel energy storage modules via the flywheel energy storage array bus; each flywheel energy storage module consists of a flywheel energy storage array management system (FMS) and several flywheel energy storage modules; each flywheel energy storage module is connected to the flywheel energy storage array bus via a flywheel energy storage converter DC switch; the flywheel energy storage array inverter (PCS) controls one or more flywheel energy storage array management systems (FMS); the flywheel energy storage array management system (FMS) controls one or more flywheel energy storage converters (FCS); and each flywheel energy storage converter (FCS) controls one flywheel energy storage device. The thermal power plant flexibility "active power balance" process monitoring and control system is used to monitor and control the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system. It includes a power grid dispatch center RTU, a power plant PMU, a thermal power unit DCS, a thermal power plant flexibility "active power balance" process control system DCS, a flywheel energy storage frequency regulation energy management system EMU, and a molten salt energy storage frequency regulation control system DCS. The thermal power plant flexibility "active power balance" process control system DCS is connected to the power grid dispatch center RTU, the thermal power unit DCS, the flywheel energy storage frequency regulation energy management system EMU, and the molten salt energy storage frequency regulation control system DCS, respectively. The power plant PMU is connected to the power grid dispatch center RTU, the thermal power unit DCS, and the flywheel energy storage frequency regulation energy management system EMU.

3. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 2, characterized in that, The control of the flywheel energy storage frequency regulation system to provide active power balance services for the power plant's rotational inertia or primary frequency regulation includes: Based on the power information sent by the power plant's PMU, a flywheel energy storage frequency regulation system is used to replace the thermal power unit to achieve primary frequency regulation "active power balance" service; Based on the dispatch power command sent by the power grid dispatch center RTU, the flywheel energy storage frequency regulation system independently provides the power grid with rotational inertia and primary frequency regulation "active power balance" services.

4. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 3, characterized in that, The method of using a flywheel energy storage frequency regulation system to replace thermal power units to achieve primary frequency regulation "active power balance" service based on power information sent by the power plant's PMU includes: The flywheel energy storage frequency regulation energy management system (EMU) receives energy information from the power plant's PMU and the flywheel energy storage array inverter (PCS). The flywheel energy storage frequency regulation energy management system (EMU) calculates the frequency disturbance based on the power information received from the power plant's PMU, compares it with the frequency deviation of the target frequency, and schedules and controls the charging and discharging power of the flywheel energy storage device array inverter (PCS). The flywheel energy storage device array inverter PCS receives the charging and discharging power commands sent by the flywheel energy storage frequency modulation energy management system EMU, and schedules and controls the charging and discharging power of the flywheel energy storage device array management system FMS. The FMS (Flywheel Energy Storage Array Management System) receives charging and discharging power control commands from the PCS (Power Control System) of the flywheel energy storage array, schedules and controls the charging and discharging operation of the flywheel energy storage devices, and realizes the primary frequency regulation "active power balance" service.

5. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 3, characterized in that, The method, which uses a flywheel energy storage frequency regulation system to independently provide the power grid with rotational inertia and primary frequency regulation "active power balance" services based on the dispatch power command sent by the power grid dispatch center RTU, includes: The power grid dispatch center RTU sends dispatch power commands to the thermal power flexible "active power balance" process control system DCS or directly to the flywheel energy storage frequency regulation energy management system EMU. After receiving the dispatch power command issued by the DCS or RTU of the thermal power plant's flexible "active power balance" process control system, the flywheel energy storage frequency regulation energy management system (EMU) dispatches and controls the charging and discharging power of the flywheel energy storage device array inverter (PCS). After receiving the charging and discharging power command sent by the flywheel energy storage array inverter PCS, the flywheel energy storage device array inverter (PCS) schedules and controls the charging and discharging power of the flywheel energy storage device array management system (EMU). After receiving the charging and discharging power control command sent by the flywheel energy storage array inverter PCS, the FMS schedules and controls the charging and discharging operation of the flywheel energy storage device to provide the grid with rotational inertia and primary frequency regulation "active power balance" services.

6. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 1, characterized in that, The method for providing active power balance services for secondary frequency regulation of the power system based on AGC power command information from the power grid dispatch center RTU and generation power status information sent by the thermal power unit DCS includes: The DCS of the thermal power plant's flexible "active power balance" process control system receives AGC power command information sent by the RTU of the power grid dispatch center and power generation status information sent by the DCS of the thermal power unit. The DCS (Distributed Control System) for flexible active power balance in thermal power plants analyzes and controls the operation of the thermal power plant's flexible active power balance process system in real time 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 information of the AGC (Automatic Generation Control) frequency regulation in the thermal power unit's DCS. It compares the real-time power generation of the thermal power unit's DCS with the AGC power commands sent by the RTU (Remote Control Unit) of the power grid dispatch center.

7. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 1, characterized in that, The method of adjusting target power commands based on the grid dispatch center RTU, using a flywheel energy storage frequency regulation system, a flywheel energy storage frequency regulation system, and / or a molten salt energy storage frequency regulation system integrated with thermal power units to provide secondary frequency regulation "active power balance" services for the power system, includes: When the target power of AGC regulation of the RTU in the power grid dispatch center is less than (real-time frequency regulation power of the flywheel energy storage frequency regulation system + basic regulation rate of the unit × rated power of the unit), the flywheel energy storage frequency regulation system is used in conjunction with the thermal power unit to realize the AGC regulation target power command. When the target power of AGC regulation of the RTU in the power grid dispatch center is greater than (real-time frequency regulation power of the flywheel energy storage frequency regulation system + basic regulation rate of the unit × rated power of the unit), the flywheel energy storage frequency regulation system and the molten salt energy storage frequency regulation system are integrated with the thermal power unit to realize the AGC regulation target power command.

8. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 7, characterized in that, The method for implementing AGC (Automatic Generation Control) target power commands by combining a flywheel energy storage frequency regulation system with a thermal power unit includes: Determine the regulation rate within the full load regulation range of the thermal power unit; Determine the remaining percentage of the SOC energy storage system in the flywheel energy storage frequency regulation system; Control thermal power units to respond to the AGC adjustment target power command of the RTU of the power grid dispatch center according to their own capabilities; The flywheel energy storage frequency regulation energy management system (EMU) adjusts the target power command from the grid dispatch center RTU and the difference between the real-time power generation of the thermal power unit DCS read by the "active power balance" process control system DCS. It then sequentially dispatches and controls the flywheel energy storage device array inverter PCS, flywheel energy storage device array management system (FMS), flywheel energy storage device converter FCS, and flywheel energy storage device to regulate the power generation and consumption. Among them, the bus voltage of the flywheel energy storage device array operates at a constant voltage within the rated parameter range, and the charge / discharge rate of the flywheel energy storage device is ≤2C, where C is the capacity of the flywheel energy storage device; Once the output power of the thermal power unit meets the AGC regulation target power command of the power grid dispatch center RTU, the regulating flywheel energy storage frequency regulation system stops outputting power and maintains 50±5% SOC for standby operation.

9. The application method of the flexible multi-source coordinated "active power balance" process system for thermal power as described in claim 7, characterized in that, The method for implementing AGC (Automatic Generation Control) target power commands by integrating a flywheel energy storage frequency regulation system and a molten salt energy storage frequency regulation system with a thermal power unit includes: If the molten salt electric heating device is in operation, then: When the difference between the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit and the AGC regulation target power of the power grid dispatch center RTU is less than or equal to the power regulation capability of the molten salt electric heating device under operating conditions, the control method includes: determining that the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit is already operating in a saturated state; treating the molten salt electric heating device as a controllable load, and adjusting the cumulative output power of the molten salt electric heating device combined with the flywheel energy storage frequency regulation system and the thermal power unit to reach the AGC regulation target power of the power grid dispatch center RTU; When the difference between the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit and the AGC target power of the power grid dispatch center RTU is greater than the power regulation capability of the molten salt electric heating device under operating conditions, the control method includes: determining that the cumulative grid-connected power of the flywheel energy storage frequency regulation system combined with the thermal power unit has reached saturation; using the water-molten salt-steam inverted heat exchange system as a controllable load, and adjusting the cumulative output power of the water-molten salt-steam inverted heat exchange system, the thermal power unit combined with the flywheel energy storage frequency regulation system, and the molten salt electric heating device to reach the AGC target power of the power grid dispatch center RTU; If the molten salt electric heating device is not in operation, then: When the target power regulation command of the grid dispatch center RTU increases continuously in one direction, the water-molten salt-steam inverted heat exchange system is controlled to supply the plant / industrial steam system, reducing the steam extraction from the turbine and increasing the power generation; at the same time, the water-molten salt-steam inverted heat exchange system is controlled to supply the main steam system, increasing the main steam inlet flow of the turbine and increasing the power generation. When the target power regulation command of the RTU in the power grid dispatch center decreases continuously in one direction, the water-molten salt-steam reverse conversion heat exchange system is controlled to perform molten salt heat storage.

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