CN217486190U - Flexible multi-source coordinated active balance process system for thermal power - Google Patents

Abstract

The utility model relates to a thermal power flexibility multisource coordination "active power balance" process systems, include: a flywheel energy storage frequency modulation system, a fused salt energy storage frequency modulation system and a thermal power flexibility active power balance process monitoring control system; the flywheel energy storage frequency modulation system is connected with a 6kV bus for a unit factory; the molten salt energy storage frequency modulation system comprises a molten salt electric heating device, a molten salt energy storage device and a water-molten salt-steam inversion heat exchange system; the molten salt electric heating device is connected with a power plant on-off bus and is respectively connected with the molten salt energy storage device and the water-molten salt-steam inversion heat exchange system through pipelines; the thermal power flexibility active balance process monitoring and control system is used for controlling the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, and realizing active balance service for a thermal power unit or a power system. The utility model discloses can the wide application in thermal power flexibility reform transform "active equilibrium" service technology field.

Description

Flexible multi-source coordinated active balance process system for thermal power

Technical Field

The utility model relates to an "active balance" process systems especially relates to a thermal power flexibility multisource coordination "active balance" process systems, belongs to flywheel energy storage, fused salt energy storage, thermal power flexibility transformation manufacturing, regulation type power, electric power system "inertia, frequency modulation, peak regulation, climbing active balance service" technical field.

Background

According to the Chinese power development planning, the total installed capacity of wind power and solar power generation of renewable energy sources reaches more than 12 hundred million kilowatts in 2030 years, 13.5 hundred million kilowatts in 2035 years, new energy sources represented by wind, photovoltaic and electricity are gradually set as main power sources of China, the rapid development of the new energy source power needs an active balance adjusting power source with huge capacity, and the gap of the adjusting capacity of a national power system in 2025 years is expected to reach 2 hundred million kilowatts. However, the regulation capacity of the power system is continuously reduced along with the increase of the proportion of new energy, the thermal power generating unit is reduced along with the year-by-year reduction of the power generation load rate, and the active power balance regulation capacity of the power system is also continuously reduced and is obviously insufficient.

The national energy agency of the national reform committee, the 1519 file of national thermal power generating unit reconstruction and upgrade implementation scheme in 2021, requirement: and carrying out heat supply transformation on the thermal power generating unit, and optimizing the operation of the produced cogeneration unit. And technical transformation of the cogeneration unit is encouraged, the heat supply capacity is further improved, and the requirement of newly increased heat load is met. The flexibility manufacturing and the flexibility modification of the thermal power generating unit are continuously carried out, the technical feasibility, the economy and the operation safety are comprehensively considered, and after the flexibility modification of the thermal power generating unit in service, the minimum power generation output reaches about 30 percent of rated load; the flexibility manufacturing and flexibility modification of the thermal power generating unit are accelerated, and the flexibility modification of the thermal power generating unit in service should be changed as much as possible. The general requirement of the peak regulation capability under the pure condensation working condition is that the minimum power generation output reaches 35% of rated load, and the peak regulation capability of the minimum power generation output reaching 40% of rated load in 6 hours per day is realized by the thermoelectric decoupling strive when the heating thermoelectric unit runs in the heat supply period.

At present, the flexible manufacturing and flexible modification of the thermal power generating unit are not reported by a mature scheme which is large-scale, safe, reliable, economical and applicable.

The power grid frequency essentially reflects the balance degree of power generation and load in the power system, and is one of important indexes of the operation quality and safety of the power system. The thermal power generating unit participates in active frequency modulation and mainly depends on the Automatic Generation Control (AGC) of the primary frequency modulation performance and the secondary frequency modulation of the thermal power generating unit, and the active power of the thermal power generating unit is adjusted through the AGC to achieve the aim of power grid frequency modulation scheduling. However, due to the characteristic of large thermal inertia of the coal-electric machine set, the traditional thermal power unit has the problems of delay in adjusting AGC frequency modulation instructions, low climbing speed and low adjustment precision, and the requirement of a power grid AGC adjustment index standard cannot be met when the boiler load is less than the stable combustion load. And when the minimum power generation output of the thermal power generating unit is lower than the stable combustion load of the boiler, the primary frequency modulation capacity tends to zero, and the active balance capacity is difficult to meet the relevant standard requirements of safe and stable operation of a power grid.

According to the report of the north star energy storage network, as long as 7 months in 2020, the total number of frequency modulation items of thermal power energy storage combined units put into operation, under construction and under winning in China reaches 58, and energy storage items for assisting AGC frequency modulation of thermal power units in nearly three years are basically the energy storage process of lithium iron phosphate batteries. However, the process for assisting the AGC frequency modulation of the thermal power generating unit has the following main problems:

a) thermal runaway: most of the electrolyte of the lithium ion battery is an organic solvent, the main component of the electrolyte is carbonates, the flash point and the boiling point are low, and the oxidation reaction is easy to occur; once leakage and other conditions occur, dangerous accidents such as battery ignition and the like are easily caused; in the manufacturing process of the lithium ion battery, a small amount of impurities such as dust and the like inevitably exist, and the impurities can easily damage the diaphragm, cause internal short circuit and cause safety accidents; in fact, the lithium battery energy storage system which runs in a large scale and a long period has the safety risks of thermal runaway and burning explosion after the thermal runaway which cannot be completely avoided; the fire control measures for controlling explosion of the lithium battery energy storage system adopted at present cannot effectively prevent deep deterioration after explosion and combustion; at present, due to the characteristics of the lithium ion battery, the lithium ion battery energy storage system assisting the thermal power generating unit to perform combined frequency modulation still has no intrinsic safety, and the problem of the thermal safety of the lithium ion battery is not fundamentally solved in the application of the thermal power energy storage unit to frequency modulation;

b) does not participate in primary frequency modulation of the power grid;

c) insufficient frequency modulation energy: although the lithium battery energy storage can carry out quick charging and discharging to assist the AGC frequency modulation of the thermal power generating unit, the capability of continuously tracking an AGC frequency modulation command when the AGC adjusting power is changed in a large range is lacked;

d) the AGC frequency modulation precision adjustment of the thermal power generating unit is not involved;

e) the service life is short;

f) it is difficult to achieve unattended operation.

Disclosure of Invention

To the problem, the utility model aims at providing a thermal power flexibility multisource coordination "active balance" process systems can realize multisource coordination "active balance" service.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a thermal power flexibility multi-source coordination 'active power balance' process system comprises:

a flywheel energy storage frequency modulation system, a fused salt energy storage frequency modulation system and a thermal power flexibility active power balance process monitoring control system;

the flywheel energy storage frequency modulation system is connected with a 6kV bus (11) for a thermal power plant;

the molten salt energy storage frequency modulation system comprises a molten salt electric heating device, a molten salt energy storage device and a water-molten salt-steam inversion heat exchange system containing a water-molten salt-steam inversion heat exchange device (47);

the power supply of the molten salt electric heating device is taken from a power plant on-off bus (3), and the molten salt electric heating device is connected with the molten salt energy storage device through a molten salt electric heating device cold salt supply pipeline (38) and a molten salt electric heating device hot salt return pipeline (46);

the salt side pipeline of the 'water-molten salt-steam inverse transformation heat device' (47) is connected with the molten salt energy storage device through a 'water-molten salt-steam inverse transformation heat device' cold salt supply pipeline (39) and a 'water-molten salt-steam inverse transformation heat device' cold salt return pipeline (40), is connected with the molten salt electric heating device through a molten salt electric heating device hot salt supply pipeline (49), and is connected with the molten salt energy storage device through a molten salt electric heating device hot salt supply pipeline (50) after being secondarily heated by the molten salt electric heating device;

the thermal power flexibility active balance process monitoring and control system is used for monitoring and controlling the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, and active balance of a unit or a power grid is achieved.

Furthermore, the flywheel energy storage frequency modulation system comprises a plurality of flywheel energy storage frequency modulation units which are connected in parallel, each flywheel energy storage frequency modulation unit is connected in parallel with a flywheel energy storage frequency modulation system bus (14) through a flywheel energy storage frequency modulation unit transformer (16), and is connected with a thermal power plant service 6kV bus (11) through a flywheel energy storage frequency modulation system bus isolating switch (15);

each flywheel energy storage frequency modulation unit comprises at least one group of flywheel energy storage device array inverters PCS (23), each flywheel energy storage device array inverter PCS (23) is connected with a flywheel energy storage frequency modulation unit bus (21) through a flywheel energy storage device array inverter alternating current isolating switch, and the flywheel energy storage frequency modulation unit bus (21) is connected with the flywheel energy storage frequency modulation unit transformer (16) through the flywheel energy storage frequency modulation unit isolating switch (20).

Furthermore, each flywheel energy storage device array inverter PCS (23) is also connected with at least one flywheel energy storage device module through a flywheel energy storage device array bus (22); each flywheel energy storage device module consists of a flywheel energy storage array management system FMS (24) and a plurality of flywheel energy storage device modules, each flywheel energy storage device module is connected into the flywheel energy storage device array bus (22) through a direct current switch of a flywheel energy storage device converter, the flywheel energy storage device array inverters PCS (23) control the corresponding flywheel energy storage array management system FMS (24), the flywheel energy storage array management systems FMS (24) control the corresponding flywheel energy storage device converters FCS (25), and each flywheel energy storage device converter FCS (25) controls one flywheel energy storage device (26).

Further, the molten salt electric heating device is provided with a molten salt electric heating device power supply system and a molten salt electric heater (27);

the power supply system of the molten salt electric heating device comprises a power plant switch plant bus power supply isolating switch (28), a molten salt electric heating device power supply transformer (7), a molten salt electric heating device power supply transformer power supply isolating switch (29) and a molten salt electric heater power supply isolating switch (30) which are sequentially connected, and the other side of the molten salt electric heater power supply isolating switch (30) is connected with the molten salt electric heater (27);

the molten salt electric heater (27) is connected with the molten salt energy storage device through a molten salt electric heating device cold salt supply pipeline (38), and a cold salt supply isolation door (35) is arranged on the molten salt electric heating device cold salt supply pipeline (38); the molten salt electric heater (27) is connected with the 'water-molten salt-steam inverse transformation heat device' (47) through a molten salt electric heating device hot salt supply pipeline (49), and a 'water-molten salt-steam inverse transformation heat device' hot salt supply salt isolating door (51) and a 'water-molten salt-steam inverse transformation heat device' hot salt outlet isolating door (48) are arranged on the molten salt electric heating device hot salt supply pipeline (49); the molten salt electric heater (27) is connected with the molten salt energy storage device through a molten salt electric heating device hot salt return pipeline (46), and a hot salt tank return salt door (45) is arranged on the molten salt electric heating device hot salt return pipeline (46).

Further, the molten salt energy storage device comprises a cold salt tank (31) and a hot salt tank (32);

the cold salt tank (31) is connected with 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 inverse transformation heat device through the cold salt supply pipeline (42), and a cold salt pump (33) and a cold salt pump salt supply door (34) are arranged on the cold salt supply pipeline (42); the cold salt tank (31) is also connected with the water-molten salt-steam inverse transformation heat device (47) through a salt return pipeline (40) of the water-molten salt-steam inverse transformation heat device, and a cold salt return isolating door (37) of the water-molten salt-steam inverse transformation heat device is arranged on the salt return pipeline (40) of the water-molten salt-steam inverse transformation heat device;

the hot salt tank (32) is connected with the 'water-molten salt-steam inverse transformation heat device' hot salt supply pipeline (50) and the 'water-molten salt-steam inverse transformation heat device' (47) through a hot salt pump (43) and a hot salt pump outlet salt supply door (44), and is connected with the molten salt electric heater (27) through the molten salt electric heating device hot salt return pipeline (46).

Further, the water-molten salt-steam inversion heat exchange system further comprises a molten salt heat storage auxiliary peak regulation system and a molten salt heat release auxiliary peak regulation system;

the molten salt heat storage auxiliary peak regulation system comprises a bypass turbine main steam pressure reduction steam supply system, a bypass turbine reheating heat section steam supply system, a steam temperature reduction plant supply/industrial steam system and a 'water-molten salt-steam inverse transformation heat device' drainage system;

the molten salt heat release auxiliary peak regulation system comprises a high-pressure water supply system of a 'water-molten salt-steam inverse transformation heat device', a molten salt heat release main steam supply system, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply system and a molten salt heat release plant/industrial steam system;

the steam side pipeline of the water-molten salt-steam inverse heat conversion device (47) is respectively connected with the bypass turbine main steam pressure reduction steam supply system, the bypass turbine reheating thermal section steam extraction system, the steam temperature reduction plant supply/industrial steam system, the molten salt heat release supply main steam system and the molten salt heat release plant supply/industrial steam system; and a water side pipeline of the 'water-molten salt-steam reverse conversion heat device' (47) is respectively connected with a 'water-molten salt-steam reverse conversion heat device' high-pressure water supply system, a 'water-molten salt-steam reverse conversion heat device' low-pressure water supply system and a 'water-molten salt-steam reverse conversion heat device' drainage system.

Further, a steam desuperheater, a condenser and a drainage cooler which are sequentially connected are arranged in the water-molten salt-steam inverse heat conversion device (47) and are used for realizing positive molten salt heat absorption; and the feed water preheater, the steam generator and the steam superheater are connected in sequence and used for realizing a reverse heat release function.

Further, the high-pressure water supply system of the 'water-molten salt-steam inverse transformation heat device' comprises a boiler feed water pump deoxygenation water supply pipeline (65) led out of a boiler feed water deoxygenator (86) of a thermal power generating unit, a boiler feed water pump (87), a boiler high-pressure feed water pump outlet isolation door (61), a steam turbine high-pressure heater water supply system (58), a 'water-molten salt-steam inverse transformation heat device' boiler high-pressure water supply pipeline tee joint (95), a 'water-molten salt-steam inverse transformation heat device' high-pressure water supply pipeline (67) and a 'water-molten salt-steam inverse transformation heat device' high-pressure water supply inlet isolation door (62) arranged on the high-pressure water supply pipeline tee joint and the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply pipeline;

the low-pressure water supply system of the ' water-molten salt-steam inverse transformation heat device ' comprises a ' water-molten salt-steam inverse transformation heat device ' low-pressure water supply pump deoxygenation water supply pipeline (66), a ' water-molten salt-steam inverse transformation heat device ' low-pressure water supply pump (59), a ' water-molten salt-steam inverse transformation heat device ' low-pressure water supply pipeline (68) and a ' water-molten salt-steam inverse transformation heat device ' low-pressure water supply isolation door (60) arranged on the low-pressure water supply pipeline (68), wherein the water-molten salt-steam inverse transformation heat device ' low-pressure water supply isolation door is led out of a water supply deaerator (86) of the thermal power generating unit;

the drainage system of the water-molten salt-steam inverse transformation heat device comprises a drainage pipeline (69) of the water-molten salt-steam inverse transformation heat device led out from the water-molten salt-steam inverse transformation heat device (47), a drainage isolation door (63) and a drainage adjusting door (64), wherein the drainage isolation door (63) and the drainage adjusting door (64) are arranged on the drainage pipeline, and the other end of the drainage pipeline (69) of the water-molten salt-steam inverse transformation heat device is connected to a water supply deaerator (86) of the boiler of the thermal power generating unit.

Furthermore, the bypass turbine main steam pressure-reducing steam supply system comprises a high-pressure bypass steam pipeline tee joint (97) arranged between an existing boiler (52) of the thermal power generating unit and a steam supply turbine main steam pipeline (96), a turbine high-pressure bypass steam pipeline (99) connected with the other end of the high-pressure bypass steam pipeline tee joint (97) through a turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint (90) and a turbine high-pressure bypass valve steam inlet isolation door (70) arranged on the turbine high-pressure bypass steam pipeline tee joint, a bypass turbine main steam extraction pipeline tee joint (91) arranged at the tail end of the turbine high-pressure bypass steam pipeline (99), and a bypass main steam extraction pipeline (81) of a water-molten salt-steam inverse transformation heat device led out from the bypass turbine main steam extraction pipeline tee joint (91), wherein the water-molten salt-steam inverse transformation bypass turbine main steam extraction pipeline (81) is connected into the water turbine main steam extraction pipeline (81) A steam inlet main pipe (79) pipeline interface of the molten salt-steam inverse transformation heat device (47), a high-pressure bypass steam supply isolation door (56) and a bypass turbine main steam extraction pressure regulating valve (74) are arranged on a bypass turbine main steam extraction pipeline (81), and the other end of a bypass turbine main steam extraction pipeline tee joint (91) is connected with a turbine high-pressure bypass valve (54) and a high-pressure bypass valve outlet isolation door (55);

the bypass turbine reheating heat section steam extraction system comprises a turbine reheating heat section steam pipeline (98) led out from the boiler (52), and is connected into a steam inlet main pipe (79) pipeline interface of the water-fused salt-steam inverse conversion heating device (47) through a turbine low-pressure bypass valve inlet isolation door (72), a turbine reheating heat section steam supply pipeline tee joint (93) and a bypass turbine reheating heat section steam supply pipeline (82), a turbine reheating heat section bypass steam supply pipeline check door (92) and a turbine reheating heat section bypass steam supply pipeline isolation door (73) are arranged on the bypass turbine reheating heat section steam supply pipeline (82), the turbine reheating heat section steam pipeline (98) is connected with a turbine low-pressure bypass valve (85) through the other side of the turbine reheating heat section steam supply pipeline tee joint (93), and a turbine low-pressure bypass valve outlet isolation door (75) and a turbine low-pressure bypass valve outlet isolation door (85) are arranged on the outlet side of the turbine low-pressure bypass valve (85) The connecting pipeline (100), the steam pipeline (98) of the reheating thermal section of the steam turbine is also connected with a steam inlet adjusting valve (57-2) of a middle pressure cylinder of the steam turbine;

the steam desuperheating plant/industrial steam system, comprising: the steam temperature-reducing supply plant/industrial steam pipeline (83) is connected with the 'water-molten salt-steam inverse transformation heat device' (47), the steam temperature-reducing supply plant/industrial steam pipeline (83) is connected to a plant/industrial steam pipeline through a molten salt heat-releasing and steam temperature-reducing supply plant/industrial steam pipeline tee joint (94), and the plant/industrial steam pipeline is provided with a 'water-molten salt-steam inverse transformation heat device' supply plant/industrial steam check valve (78);

the molten salt heat release and main steam supply system comprises a water-molten salt-steam inverse transformation heat device auxiliary main steam supply pipeline (80) led out from the water-molten salt-steam inverse transformation heat device (47), an auxiliary main steam supply isolation door (88) of the auxiliary main steam supply pipeline, and a steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolation door (71), wherein the other end of the steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolation door (71) is connected with a steam turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint (90); (ii) a

The molten salt heat release supply plant/industrial steam system comprises a molten salt heat release supply plant/industrial steam pipeline (84) connected with the ' water-molten salt-steam inverse transformation heat device ' (47) and a ' water-molten salt-steam inverse transformation heat device ' supply plant/industrial steam isolating door (76) arranged on the molten salt heat release supply plant/industrial steam inverse transformation heat device ', wherein the other end of the ' water-molten salt-steam inverse transformation heat device ' supply plant/industrial steam isolating door (76) is connected with a third port of the molten salt heat release and steam temperature reduction supply plant/industrial steam pipeline tee joint (94).

Further, the flexible thermal power active balance process monitoring and control system comprises a power grid dispatching center RTU (1), a power plant PMU (5), a thermal power unit DCS (6), a flexible thermal power active balance process control system DCS (17), a flywheel energy storage frequency modulation energy management system EMU (18) and a molten salt energy storage frequency modulation control system DCS (19); the thermal power flexibility active balance process control system DCS (17) is respectively connected with a power grid dispatching center RTU (1), a thermal power generating unit DCS (6), a flywheel energy storage frequency modulation energy management system EMU (18) and a fused salt energy storage frequency modulation control system DCS (19) through hard wiring and network communication connection interfaces; the power plant PMU (5) is connected with a power grid dispatching center RTU (1), a thermal power generating unit DCS (6) and a flywheel energy storage frequency modulation energy management system EMU (18) through hard wiring and network communication connection interfaces.

The utility model discloses owing to take above technical scheme, it has following advantage:

(1) the power type flywheel energy storage frequency modulation system is adopted to replace a thermal power generating unit to respond to the primary frequency modulation of a power grid and assist the AGC frequency modulation of the thermal power generating unit, the 'active balance' performance quality is good, the standard is high, and the flywheel energy storage frequency modulation system has a qualitative breakthrough in the aspects of intrinsic safety of equipment, power scale, operation controllability, life cycle cost and the like compared with the AGC frequency modulation of the electrochemical battery energy storage auxiliary thermal power generating unit, and is specifically embodied in that:

a) the charge-discharge operation multiplying power is more than or equal to 2C: the rotational inertia and primary frequency modulation active power balance capability of the thermal power generating unit and the new energy source unit are strong;

b) the control precision is high: the dispatching and adjusting precision of the power grid AGC can be controlled to be not higher than 0.5 percent of the rated power of the unit or not higher than the AGC command power plus or minus 0.5 MW;

c) life cycle cost is low: the service life of the flywheel energy storage system is more than 20 years, and is the same as that of main equipment of a thermal power generating unit.

d) Do benefit to intelligent management and control: unattended operation, accurate control, intelligent management and control and intelligent operation can be implemented through datamation and networking.

(2) Electric heating molten salt and molten salt heat storage are used as controllable load response power grid AGC scheduling, and the frequency modulation, peak regulation, climbing and active power balance adjusting range is large.

The molten salt electric heating device has the capability of quickly adjusting power and can be used as a controllable load combined thermal power generating unit for AGC frequency modulation and peak shaving.

(3) The 'fused salt energy storage and frequency modulation system' is applied to fuse the thermal power generating unit to absorb and release heat through fused salt, the steam supply amount of the thermal power generating unit is reduced or increased to serve as a controllable load to respond to the AGC scheduling of the power grid, and the system is large in frequency modulation, peak regulation, slope climbing and 'active power balance' power regulation range and good in economical efficiency.

The molten salt has the advantages of wide liquid temperature range, liquid state of the molten salt in the whole heat storage and release process, high convection heat transfer coefficient, low viscosity, high use temperature and the like, and has the advantages of accurate and adjustable heat release temperature and the like.

(4) Flywheel energy storage, electric heating molten salt, molten salt heat storage and a 'water-molten salt-steam inverse heat conversion device' are applied to heat exchange and fusion of a thermal power generating unit and steam flow regulation multiple combination to form a novel 'regulation type power supply' of a power grid.

To sum up, the utility model provides a thermal power flexibility multisource coordination "active balance" process system, through using flywheel energy storage frequency modulation system, fused salt electric heater unit, fused salt energy storage device, "water-fused salt-steam contravariant heat transfer system" to unite the thermal power unit and respond to electric wire netting inertia, frequency modulation, degree of depth peak regulation, climbing, active balance scheduling regulation requirement; a flywheel energy storage frequency modulation system, a molten salt electric heating device, a molten salt energy storage device and a water-molten salt-steam inversion heat exchange system are combined with steam flow regulation of a thermal power generating unit to form a virtual frequency modulation power supply of a power system, and the virtual frequency modulation power supply is directly subjected to automatic power control and scheduling of a power grid APC (automatic Power control) and provides services of rotational inertia, frequency modulation, peak regulation and climbing active balance for the power system. Therefore, the utility model discloses can wide application in flywheel energy storage, fused salt energy storage, thermoelectricity flexibility transformation manufacturing, regulation type power, electric power system "inertia, frequency modulation, peak shaving, climbing active power balance service" technical field.

Drawings

Fig. 1 is a topological diagram of a thermal power flexibility multi-source coordination "active power balance" process system according to an embodiment of the present invention;

fig. 2 is a topology diagram of a flywheel energy storage primary frequency modulation and auxiliary thermal power generating unit AGC frequency modulation process system according to an embodiment of the present invention;

fig. 3 is a topological diagram of an AGC frequency modulation and deep peak shaving process system of a fused salt energy storage auxiliary thermal power generating unit provided by an embodiment of the present invention;

fig. 4 is a comparison diagram of the primary frequency modulation effect of the thermal power generating unit-flywheel energy storage provided by an embodiment of the present invention;

the reference numerals in the figures are as follows:

1. a power grid dispatching center RTU (remote Terminal Unit), which is called a remote Terminal control system in Chinese;

2. a power grid;

3. a power plant on-off bus; 3-1, a power plant and a power plant switching bus; 3-2, a power plant and a power plant switching bus;

4. a power plant on-off bus coupler switch;

5. PMU (phasor Unit) of power plant, wherein the Chinese name is totally called phasor Measurement unit;

6. DCS (distributed Control systems) of thermal power generating units, wherein Chinese is called a distributed Control system;

7. the fused salt electric heating device is used for supplying power to the transformer;

8. a steam turbine generator unit;

9. a turbine generator outlet transformer;

10. a service transformer;

11. 6kV factory bus; 11-1, a section 1A of a factory 6kV bus; 11-2, a section 1B of a factory 6kV bus;

12. a factory 6kV bus isolating switch; 12-1, isolating switches of 1A section of a factory 6kV bus; 12-2, a station 6kV bus 1B section isolating switch;

13. a factory 6kV bus interconnection switch;

flywheel energy storage frequency modulation system

14. A flywheel energy storage frequency modulation system bus;

15. a bus isolating switch of the flywheel energy storage frequency modulation system; 15-1, disconnecting a bus of the flywheel energy storage frequency modulation system from a 1A section of the station-used 6kV bus, and 15-2, disconnecting a bus of the flywheel energy storage frequency modulation system from a 1B section of the station-used 6kV bus;

16. a flywheel energy storage frequency modulation system unit transformer;

17. the thermal power flexibility is an 'active balance' process control system DCS;

18. flywheel energy storage frequency modulation energy management system emu (electric multiple units);

19. a molten salt energy storage frequency modulation control system DCS;

20. the flywheel energy storage frequency modulation system unit is provided with an electric isolating switch;

21, flywheel energy storage frequency modulation system unit bus;

22. a flywheel energy storage device array bus;

23. flywheel energy storage device array inverter PCS;

24. flywheel energy storage array Management system fms (flywheel Management system);

25. flywheel energy storage converter fcs (flywheel Conversion system);

26. a flywheel energy storage device;

molten salt electric heating device:

27. a molten salt electric heater;

28. the fused salt electric heating device supplies power to the transformer inlet switch;

29. the fused salt electric heating device is provided with an electric isolating switch;

30. a power supply isolating switch of the molten salt electric heater;

fused salt energy storage device

31. A cold salt tank;

32. a hot salt tank;

33. a cold salt pump;

34. a cold salt pump feeds a salt door;

35. the molten salt electric heating device is provided with a cold salt-supplying isolating door;

36. a 'water-molten salt-steam inverse heat transfer device' is used for cooling salt and feeding salt to a salt isolating door;

37. a 'water-molten salt-steam inverse heat conversion device' is provided with a cold salt return isolating door;

38. the molten salt electric heating device is provided with a cold salt feeding pipeline, namely a three-way connector of a cold salt pump feeding salt door outlet pipeline is connected to a cold salt inlet pipeline connector of the molten salt electric heating device;

39. the 'water-molten salt-steam inverse transformation heat device' is a cold salt supply pipeline, namely a pipeline between a three-way connector of a cold salt pump salt door outlet pipeline and a cold salt inlet pipeline connector of the 'water-molten salt-steam inverse transformation heat device';

40. a cold salt return pipeline of the water-molten salt-steam inverse transformation heat device is connected from a cold salt outlet pipeline interface of the water-molten salt-steam inverse transformation heat device to a cold salt tank inlet pipeline interface;

41. the cold salt pump is three-way to the salt door outlet pipeline;

42. the cold salt tank is used for supplying (supplying) salt, namely a pipeline from a cold salt pump inlet pipeline to a cold salt pump salt supply door outlet pipeline tee joint;

43. a hot salt pump;

44. the hot salt pump is discharged to the salt gate;

45. a salt return door of the hot salt tank;

46. a hot salt return pipeline of the molten salt electric heating device, namely a pipeline between a hot salt outlet pipeline interface of the molten salt electric heating device and a hot salt inlet pipeline interface of a hot salt tank;

47. "water-molten salt-steam inverse heat exchanger";

48. a 'water-molten salt-steam inverse heat conversion device' is a hot salt outlet isolating door;

49. a hot salt outlet pipeline interface of the molten salt electric heating device, namely a 'water-molten salt-steam inverse transformation heat device', is connected to a hot salt inlet pipeline interface of the molten salt electric heating device;

50. a hot salt tank is connected with a salt supply pipeline, namely an outlet port of a hot salt pump outlet salt supply door 44 is connected with a hot salt inlet pipeline of a water-molten salt-steam inverse heat conversion device;

51. a hot salt supply isolating door of the molten salt electric heating device;

52. a boiler;

53. 53-1 parts of a steam turbine, 53-2 parts of a high-pressure steam turbine cylinder, 53-3 parts of a medium-pressure steam turbine cylinder and a low-pressure steam turbine cylinder;

54. a turbine high pressure bypass valve;

55. an outlet isolation door of the high-pressure bypass valve of the steam turbine;

56. a high pressure bypass steam supply isolation door;

57. a steam turbine admission regulating gate; 57-1, a steam turbine high-pressure cylinder steam inlet adjusting valve, 57-2, a steam turbine intermediate pressure cylinder steam inlet adjusting valve and 57-3, a steam turbine low-pressure cylinder steam inlet adjusting valve;

58. a steam turbine high pressure heater water supply system;

59. a low-pressure water supply pump of a water-molten salt-steam inverse heat conversion device;

60. a low-pressure water supply isolation door of a water-molten salt-steam inverse heat conversion device;

61. an outlet isolation door of a high-pressure feed water pump of the boiler;

62. a high-pressure water supply inlet isolating door of a water-molten salt-steam inverse heat conversion device;

63. a 'water-hot salt-steam inverse heat transfer device' is a drainage isolation door;

64. a 'water-hot salt-steam inverse heat transfer device' drainage regulating gate;

65. a boiler feed pump deoxygenation water supply pipeline, namely an outlet pipeline of a boiler feed water deoxygenator to an inlet pipeline of a boiler feed pump;

66. the low-pressure feed pump deoxygenation water supply pipeline of the 'water-molten salt-steam inverse transformation heat device', namely an outlet pipeline interface of a boiler feed water deoxygenator is connected to an inlet pipeline interface of the low-pressure feed pump of the 'water-molten salt-steam inverse transformation heat device';

67. a high-pressure water supply pipeline of the 'water-molten salt-steam inverse transformation heat device', namely a three-way 95 connector of the high-pressure water supply pipeline of the boiler of the water-molten salt-steam inverse transformation heat device is connected to a water supply inlet pipeline connector of the water-molten salt-steam inverse transformation heat device;

68. a low-pressure water supply pipeline of the 'water-molten salt-steam inverse transformation heat device', namely a water-molten salt-steam inverse transformation heat device low-pressure water supply pump outlet pipeline interface is connected to a water-molten salt-steam inverse transformation heat device water supply inlet pipeline interface;

69. a drain pipeline of the water-molten salt-steam inverse transformation heat device is a drain outlet pipeline interface of the water-molten salt-steam inverse transformation heat device to a main bypass pipeline interface and a reheat steam drain inlet pipeline interface of a boiler feed water deaerator;

70. a steam inlet isolation door of a high-pressure bypass valve of the steam turbine;

71. the steam turbine assists the main steam high-pressure bypass pipeline to enter the steam isolating door;

72. a steam inlet isolation door of a low-pressure bypass valve of the steam turbine;

73. an isolation door of a steam extraction pipeline of a reheating thermal section of the bypass steam turbine;

74. a main steam extraction pressure regulating valve of the bypass steam turbine;

75. an outlet isolation door of the low-pressure bypass valve of the steam turbine;

76. the 'water-molten salt-steam inverse heat transfer device' is used for a plant/industrial steam pipeline isolation door;

77. a water-molten salt-steam inverse heat transfer device is a steam temperature reduction plant/industrial steam isolation door;

78. the 'water-molten salt-steam inverse heat-exchanging device' is used for a plant/industrial steam check valve;

79. a water-molten salt-steam inverse heat-exchanging device is arranged in a steam inlet main pipe;

80. an auxiliary main steam supply pipeline, a water-molten salt-steam inverse transformation heat device, an auxiliary main steam pipeline interface and a three-way interface of a high-pressure bypass auxiliary main steam inlet pipeline of the steam turbine are supplied;

81. the water-molten salt-steam inverse transformation heat device bypasses a main steam extraction pipeline of the steam turbine, and bypasses a tee joint of the main steam extraction pipeline of the steam turbine to an inlet pipeline joint of a steam inlet main pipe of the water-molten salt-steam inverse transformation heat device;

82. a pipeline between a bypass steam turbine reheating thermal section steam extraction pipeline and a tee joint of the steam turbine reheating thermal section steam extraction pipeline to a steam inlet main pipe joint of a water-molten salt-steam inverse heat conversion device;

83. the steam temperature-reducing supply plant/industrial steam pipeline, the 'water-molten salt-steam inverse heat-transfer device' is internally provided with a steam temperature reducer steam outlet pipeline interface to a pipeline between a molten salt heat release and steam temperature-reducing supply plant/industrial steam pipeline tee joint;

84. a fused salt heat release supply plant/industrial steam pipeline, a 'water-fused salt-steam inverse heat transfer device' supply plant/industrial steam pipeline interface to a pipeline between a plant supply/industrial steam supply pipeline interface;

85. a turbine low pressure bypass valve;

86. a boiler feed water deaerator;

87. a boiler feed pump;

88. the 'water-molten salt-steam inverse heat conversion device' is used for providing an auxiliary main steam isolation door;

89. a water-molten salt-steam inverse heat-transfer device is used as an isolation door of a steam inlet main pipe;

90. the high-pressure bypass of the steam turbine assists the tee joint of the main steam admission pipeline;

91. a bypass steam turbine main steam extraction pipeline bypasses a steam turbine main steam extraction pipeline tee joint;

92. a check valve of a steam extraction pipeline of a reheating hot section of the bypass steam turbine;

93. a steam extraction pipeline tee joint of a reheating thermal section of the steam turbine;

94. the fused salt heat release and steam temperature reduction supply plant/industrial steam pipeline tee joint;

95. a boiler high-pressure water supply pipeline tee joint of a water-molten salt-steam inverse heat transfer device;

96. a pipeline between a main steam supply pipeline of the steam turbine and a main steam outlet of the boiler and a steam inlet regulating valve interface of a high-pressure cylinder of the steam turbine;

97. a tee joint of a steam pipeline from main steam to a high-pressure bypass of the steam turbine;

98. a steam pipeline of a reheating thermal section of the steam turbine and a pipeline at an outlet of a boiler reheater are respectively connected to a pipeline between a steam inlet regulating valve interface of a steam turbine intermediate pressure cylinder and a low-pressure bypass valve interface of the steam turbine;

99. the high-pressure bypass steam pipeline of the steam turbine, the pipeline between the tee joint of the main steam and high-pressure bypass steam pipeline of the steam turbine and the outlet isolation door interface of the high-pressure bypass valve of the steam turbine;

100. the steam turbine low pressure bypasses the steam pipeline.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "axial", "circumferential", "horizontal", "vertical", "inlet", "outlet", "feed", "return", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the system or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In addition, the terms "inlet", "outlet", "feed", "return", "front" and "rear" are used to define the components, such as "first" and "second", for the sake of convenience only to distinguish the components, and unless otherwise stated, the terms have no special meaning, and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "assembled", "disposed" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is specially explained that the pipelines are connected with each other as fixed connection points in the corresponding system instead of the corresponding system because the capacity, the coal type and the thermodynamic system parameters of the thermal power generating unit are different. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The structure and technical terms used in the present invention will be further described below.

The "active balance" includes frequency modulation, peak shaving, climbing, rotational inertia, standby and other power assisting services, which are clear in the notice of the national energy supply agency "national energy and administration regulation of national energy (2021) No. 60" Power assisting service management method "in 12 months and 21 days in 2021. Wherein:

1) frequency modulation

The frequency modulation means that when the frequency of the power system deviates from a target frequency, the grid-connected main body adjusts the active power output by means of a speed regulation system, automatic power control and the like, and the service provided by reducing the frequency deviation is provided. The frequency modulation is divided into primary frequency modulation and secondary frequency modulation. The primary frequency modulation is the service provided by the conventional unit for adjusting the active power output and reducing the frequency deviation through the automatic response of the speed regulation system, the fast frequency response of the grid-connected main bodies of new energy, energy storage and the like when the frequency of the power system deviates from the target frequency. The secondary frequency modulation refers to a service that a grid-connected main body tracks an instruction issued by an electric power dispatching mechanism through an automatic power control technology, including Automatic Generation Control (AGC), Automatic Power Control (APC) and the like, and adjusts electric power for generation in real time according to a certain adjusting rate so as to meet the requirements of frequency and power control of a tie line of an electric power system.

2) Peak regulation

The peak shaving refers to a service provided for tracking peak-valley change of a load of the power system and output change of renewable energy, and adjusting the generated electric power or starting and stopping equipment by the grid-connected main body according to an instruction issued by the power dispatching mechanism.

3) Climbing slope

The climbing refers to that the net load of the system changes greatly in a short time due to uncertain factors such as power generation fluctuation of renewable energy sources, and a grid-connected main body with a high load regulation rate regulates output according to an instruction issued by a power dispatching mechanism so as to maintain the service provided by power balance of a power system.

4) Moment of inertia

The moment of inertia is that when the power system is disturbed, the grid-connected main body provides quick positive damping responding to the frequency change rate of the power system according to the inertia characteristic of the grid-connected main body, and the service provided by sudden frequency change of the power system is prevented.

Next, the attached drawings are combined to perform primary frequency modulation on the flywheel energy storage frequency modulation system provided by the embodiment of the utility model; the thermal power generating unit is converted from an energy type power supply into an adjusting type power supply by fusing flywheel energy storage, a molten salt electric heating device, molten salt heat storage and a water-molten salt-steam inverse transformation heat device into thermal power generating unit thermal system steam flow adjustment; a flywheel energy storage, a molten salt electric heating device, a molten salt heat storage and water-molten salt-steam inverse transformation heat device are fused with a steam flow regulation multi-element combination of a thermal power generating unit to form a virtual frequency modulation power supply of a power system, and a process system of rotary inertia, frequency modulation, peak regulation and slope climbing active balance except for standby is provided for a new energy source unit in a power grid for detailed description.

Example 1

As shown in fig. 1 to fig. 3, the thermal power flexibility multi-source coordination "active balance" process system provided by this embodiment includes a flywheel energy storage frequency modulation system, a molten salt energy storage frequency modulation system, and a thermal power flexibility "active balance" process monitoring control system;

wherein, a charging and discharging circuit of the flywheel energy storage frequency modulation system is connected with a 6kV bus 11 for a unit factory;

the fused salt energy storage frequency modulation system comprises a fused salt electric heating device, a fused salt energy storage device and a water-fused salt-steam inversion heat exchange system containing a water-fused salt-steam inverse heat exchange device; the power supply of the molten salt electric heating device is taken from a power plant on-off bus 3, is connected with a cold salt tank 31 of the molten salt energy storage device through a cold salt supply pipeline 38 of the molten salt electric heating device, and is respectively connected with a water-molten salt-steam inverse transformation heat device 47 and a hot salt tank 32 of the molten salt energy storage device through a hot salt supply pipeline 49 of the molten salt electric heating device and a hot salt return pipeline 46 of the molten salt electric heating device; the salt side pipeline of the water-molten salt-steam inverse transformation heat device 47 is also connected with the hot salt tank 32 through a hot salt supply pipeline 50 of the water-molten salt-steam inverse transformation heat device; the cold salt supply pipeline 39 is connected with the cold salt tank 31 through a water-molten salt-steam inverse transformation heat device, and the cold salt return pipeline 40 is connected with the cold salt tank 31 through a water-molten salt-steam inverse transformation heat device.

The thermal power flexibility active balance process monitoring and control system is used for controlling the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, and realizing active balance service for a thermal power unit or a power system.

In the foregoing embodiment, preferably, as shown in fig. 2, an electrical system of the flywheel energy storage frequency modulation system is connected to a plant service 6kV bus 11 of the thermal power plant, and a flywheel energy storage frequency modulation system bus 14 and a flywheel energy storage frequency modulation system bus isolating switch 15 are arranged between the electrical system of the flywheel energy storage frequency modulation system and the plant service 6kV bus 11.

In the above embodiment, preferably, the other side of the plant 6kV bus 11 is connected to the power grid 2 through the plant 6kV bus isolating switch 12, the plant transformer 10, the turbo generator unit outlet transformer 9, and the plant switch plant bus 3.

In the above embodiment, preferably, the flywheel energy storage frequency modulation system includes a plurality of flywheel energy storage frequency modulation units connected in parallel, each flywheel energy storage frequency modulation unit is provided with a flywheel energy storage frequency modulation unit transformer 16, each flywheel energy storage frequency modulation unit is connected in parallel to access a flywheel energy storage frequency modulation system bus 14, and is connected to the plant 6kV bus 11 through a flywheel energy storage frequency modulation system bus isolating switch 15;

each flywheel energy storage frequency modulation unit comprises one or a plurality of groups of flywheel energy storage device array inverters PCS 23, the flywheel energy storage device array inverters PCS 23 are connected with a flywheel energy storage frequency modulation unit bus 21 through a flywheel energy storage device array inverter alternating-current isolating switch, and the flywheel energy storage frequency modulation unit bus 21 is connected with a flywheel energy storage frequency modulation unit transformer 16 through a flywheel energy storage frequency modulation unit isolating switch 20;

each flywheel energy storage device array inverter PCS 23 is also connected with one or a plurality of flywheel energy storage device modules through a flywheel energy storage device array bus 22; each flywheel energy storage device module consists of a flywheel energy storage array management system FMS 24 and a plurality of flywheel energy storage device modules, each flywheel energy storage device module is connected into a flywheel energy storage device array bus 22 through a direct current switch of a flywheel energy storage device converter, and each flywheel energy storage device module comprises a flywheel energy storage device converter FCS 25 and a flywheel energy storage device 26; the flywheel energy storage array inverter PCS 23 controls one or several flywheel energy storage array management systems FMS 24, the flywheel energy storage array management system FMS 24 controls one or several flywheel energy storage device converters FCS 25, each flywheel energy storage device converter FCS 25 controls one flywheel energy storage device 26.

In the above embodiment, preferably, as shown in fig. 3, the molten salt electric heating apparatus is provided with a molten salt electric heating apparatus power supply system and a molten salt electric heater 27. The power supply system of the molten salt electric heating device comprises a power plant switch plant bus power supply isolating switch 28, a molten salt electric heating device power supply transformer 7, a molten salt electric heating device power supply transformer power supply isolating switch 29 and a molten salt electric heater power supply isolating switch 30 which are sequentially connected, and the power supply of the molten salt electric heating device power supply transformer 7 is taken from a power plant switch plant bus 03; the molten salt electric heater 27 is connected with a molten salt electric heater power supply isolating switch 30.

In the above embodiment, preferably, the molten salt energy storage device includes the cold salt tank 31 and the hot salt tank 32, and the cold salt tank salt supply pipeline 42 of the cold salt tank 31 is provided with the cold salt pump 33 and the cold salt supply door 34; the salt supply pipeline of the hot salt tank 32 is provided with a hot salt pump 43 and a hot salt pump salt supply door 44. The cold salt of the cold salt tank 31 is respectively connected with a cold salt supply pipeline 38 of the molten salt electric heating device and a cold salt supply pipeline 39 of the water-molten salt-steam inverse transformation device by a cold salt pump 33, a cold salt pump salt supply door 34 and a cold salt pump salt supply door outlet pipeline tee 41; the salt return pipeline 40 of the cold salt tank 31 is connected from a cold salt outlet pipeline interface of a water-molten salt-steam inverse heat exchanger to a cold salt tank inlet pipeline interface, and a cold salt tank salt return door 37 is arranged on the cold salt tank pipeline interface; the hot salt tank 32 is provided with a hot salt pump 43 and a hot salt pump outlet salt feeding door 44 on the hot salt feeding pipeline, and the hot salt pump outlet salt feeding door is connected with a hot salt tank salt feeding (supplying) pipeline 50; the hot salt return pipeline 46 of the hot salt tank 32 is the hot salt return pipeline of the molten salt electric heating device.

Specifically, the cold salt supply system of the molten salt electric heating device: including cold salt jar 31, and supply salt pipeline 38 to insert pipeline and equipment between the fused salt electric heating device through cold salt jar by cold salt jar 31 through cold salt jar and supply salt pipeline 42 connection fused salt electric heating device, and be provided with cold salt pump 33 on the cold salt jar supplies salt pipeline 42, the cold salt pump gives salt door 34, cold salt pump gives salt door outlet pipeline tee bend 41, is provided with cold salt on the fused salt electric heating device cold salt supplies salt pipeline 38 and gives salt isolating door 35.

The hot salt supply system of the molten salt electric heating device comprises: the system comprises a 'water-molten salt-steam inverse transformation heat device' 47 and pipeline equipment which is connected between the molten salt electric heating devices through a molten salt electric heating device hot salt supply pipeline 49, wherein a 'water-molten salt-steam inverse transformation heat device' hot salt outlet isolation door 48 and a molten salt electric heating device hot salt supply isolation door 51 are arranged on the molten salt electric heating device hot salt supply pipeline 49.

The hot salt return system of the molten salt electric heating device comprises: comprises a molten salt electric heating device and a hot salt return pipeline 46 of the molten salt electric heating device to enter a hot salt tank 32, wherein the hot salt return pipeline 46 is provided with a hot salt tank salt return door 45.

In the above embodiment, preferably, the water-molten salt-steam inversion heat exchange system includes an "inverse water-molten salt-steam inversion heat exchange device" 47 having two bidirectional heat exchange functions of heat release and heat absorption of molten salt, and also includes an auxiliary peak regulation system for heat storage of molten salt and an auxiliary peak regulation system for heat release of molten salt; the molten salt heat storage auxiliary peak regulation system comprises a bypass turbine main steam pressure reduction steam supply system, a bypass turbine reheating heat section steam extraction system, a steam temperature reduction plant supply/industrial steam system and a 'water-molten salt-steam inverse transformation heat device' drainage system; the molten salt heat release auxiliary peak regulation system comprises a high-pressure water supply system of a 'water-molten salt-steam inverse transformation heat device', a molten salt heat release main steam supply system, a molten salt heat release plant/industrial steam supply system and a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply system.

Wherein, the "water-molten salt-steam reverse heat transfer device" 47: the salt side pipeline is connected with the fused salt energy storage device and the fused salt electric heating device, and the steam side pipeline is respectively connected with a bypass turbine main steam pressure-reducing steam supply system, a bypass turbine reheating thermal section steam extraction system, a steam temperature-reducing plant supply/industrial steam system, a fused salt heat-releasing plant supply main steam system and a fused salt heat-releasing plant supply/industrial steam system; the water side pipeline is respectively connected with a high-pressure water supply system of a water-molten salt-steam inverse transformation heat device, a low-pressure water supply system of a water-molten salt-steam inverse transformation heat device and a drainage system of a water-molten salt-steam inverse transformation heat device;

the main steam pressure-reducing steam supply system of the bypass turbine and the steam extraction system of the reheating heat section of the bypass turbine are matched with a water-molten salt-steam inverse heat conversion device 47, so that the purposes of heat absorption and heat storage of molten salt and steam temperature reduction for plant/industrial steam are achieved, and the heat supply capacity and peak regulation amplitude of a unit are increased;

the bypass steam turbine main steam pressure reduction steam supply system, the bypass steam turbine reheating hot section steam extraction system, the 'water-molten salt-steam inverse transformation heat device' drainage system and the 'water-molten salt-steam inverse transformation heat device' 47 are matched for realizing molten salt heat absorption and heat storage and unit deep peak regulation;

the existing boiler high-pressure water supply system, the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply system, the molten salt heat release main steam supply system and the 'water-molten salt-steam inverse transformation heat device' 47 are matched for realizing the heat release of the molten salt and realizing the economic operation of a unit;

the low-pressure water supply system and the industrial steam system of the 'water-molten salt-steam inverse heat transfer device' are matched with the 'water-molten salt-steam inverse heat transfer device' 47, and the low-pressure water supply system and the industrial steam system are used for realizing molten salt heat transfer, increasing the heat supply capacity and peak regulation amplitude of a unit and realizing economic operation of the unit.

In the above embodiment, preferably, the water-molten salt-steam inverse heat transfer device 47 is internally provided with a steam desuperheater, a condenser and a drain cooler which are connected in sequence, and is used for realizing a forward molten salt heat absorption and exchange function; the water supply preheater, the steam generator and the steam superheater are sequentially connected and used for realizing the heat release and heat exchange function of the inverse molten salt.

In the above embodiment, preferably, the bypass turbine main steam decompression steam supply system includes: a high-pressure bypass steam pipeline tee joint (97) arranged between an existing boiler (52) of the thermal power generating unit and a main steam pipeline (96) of the steam supply turbine, steam turbine main steam enters a high-pressure bypass steam pipeline (99) of the steam turbine and a steam inlet isolation door (70) of a high-pressure bypass valve arranged on the steam turbine high-pressure bypass steam pipeline through a steam turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint (90) from the other end of the steam turbine main steam pipeline tee joint (97), a bypass turbine main steam extraction pipeline tee joint (91) and a water-molten salt-steam inverse transformation heat device bypass turbine main steam extraction pipeline (81) led out from the bypass turbine main steam extraction pipeline are arranged at the tail end of the steam turbine high-pressure bypass steam pipeline (99), the bypass turbine main steam extraction pipeline is connected with a pipeline interface (79) of a water-molten salt-steam inverse transformation heat device, and the high-pressure bypass steam supply isolation door (56), The other end of the bypass turbine main steam extraction pipeline tee joint 91 is connected with the existing turbine high-pressure bypass valve 54 and the high-pressure bypass valve outlet isolation door 55, and the other end of the existing turbine main steam pipeline 96 is connected with the boiler 52 through the turbine main steam to the high-pressure bypass steam pipeline tee joint 97.

In the above embodiment, preferably, the bypass steam turbine reheat hot section steam extraction system includes: an existing steam turbine reheating section steam pipeline 98 led out from a boiler 52 is connected with a pipeline interface of a steam inlet main pipe 79 of a 'water-fused salt-steam inverse conversion heating device' through a steam turbine low-pressure bypass valve inlet isolating door 72, a steam turbine reheating section steam supply pipeline tee joint 93 and a bypass steam turbine reheating section steam supply pipeline 82, the bypass steam turbine reheating section steam supply pipeline 82 is provided with a steam turbine reheating section bypass steam supply pipeline check door 92 and a steam turbine reheating section bypass steam supply pipeline isolating door 73, the other side of the existing steam turbine reheating section steam pipeline 98 through the arranged steam turbine reheating section steam supply pipeline tee joint 93 is connected with an existing steam turbine low-pressure bypass valve 85, the outlet side of the turbine low pressure bypass valve 85 is provided with a turbine low pressure bypass valve outlet isolation door 75 and a connecting pipeline 100, and the other end of the existing turbine reheating thermal section steam pipeline 98 is connected with a turbine intermediate pressure cylinder steam inlet adjusting door 57-2.

The bypass turbine reheating thermal section steam extraction system is arranged to be noticed, the bypass turbine reheating steam supply flow selection needs a manufacturer to check and calculate a turbine body, and the existing turbine intermediate pressure cylinder steam inlet adjusting door 57-2 and the existing turbine intermediate pressure cylinder 53-2 body are modified as required.

In the above embodiments, preferably, the steam desuperheating for plant/industrial steam system: the system comprises a steam temperature-reducing plant/industrial steam pipeline 83 connected with a steam temperature reducer arranged in a 'water-molten salt-steam inverse transformation heat device' 47, wherein the steam temperature-reducing plant/industrial steam pipeline 83 is connected to the existing plant/industrial steam pipeline through a molten salt heat-releasing and steam temperature-reducing plant/industrial steam pipeline tee 94, and a 'water-molten salt-steam inverse transformation heat device' supply plant/industrial steam check valve 78 is arranged on the plant/industrial steam pipeline.

In the above embodiment, preferably, the "water-molten salt-steam reverse heat transfer device" hydrophobic system: the method comprises the steps of leading out a drain outlet pipeline interface by a 'water-molten salt-steam inverse transformation heat device', arranging a drain pipeline 69 of the 'water-molten salt-steam inverse transformation heat device' to lead drain into a boiler feed water deaerator 86 of a unit, and arranging a drain isolation door 63 and a drain adjusting door 64 on the drain pipeline 69 of the 'water-molten salt-steam inverse transformation heat device'.

In the above embodiment, preferably, the "water-molten salt-steam reverse heat exchanger" high-pressure water supply system: the system comprises a water supply deaerator 86 interface pipeline of an existing boiler, a deaerating water supply pipeline 65 of a boiler water supply pump, a boiler water supply pump 87, an outlet isolation door 61 of a high-pressure water supply pump of the boiler, a water supply system 58 of a steam turbine high-pressure heater, a boiler high-pressure water supply pipeline tee 95 of a 'water-molten salt-steam inverse transformation heat exchanger', a 'water-molten salt-steam inverse transformation heat exchanger' high-pressure water supply inlet isolation door 62, a 'water-molten salt-steam inverse transformation heat exchanger' high-pressure water supply pipeline 67 and a 'water-molten salt-steam inverse transformation heat exchanger' high-pressure water supply pipeline interface connected with the pipeline; the other end of the boiler high-pressure water supply pipeline tee 95 of the 'water-molten salt-steam inverse heat transfer device' is connected with the boiler 52 of the existing equipment of the unit.

In the above embodiment, preferably, the molten salt releases heat to the main steam system: the system comprises a water-molten salt-steam inverse transformation heat device, an auxiliary main steam supply pipeline 80, an auxiliary main steam supply isolation door 88 of the auxiliary main steam supply pipeline, and a steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolation door 71, wherein the water-molten salt-steam inverse transformation heat device is led out from a steam outlet pipeline interface, and the other end of the steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolation door 71 is connected with a steam turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint 90; the three-way pipe 90 of the auxiliary main steam inlet pipeline of the high-pressure bypass of the steam turbine enters the steam inlet adjusting door 57-1 of the high-pressure cylinder of the steam turbine through the existing steam pipeline 99 of the high-pressure bypass of the steam turbine, the steam inlet isolating door 70 of the high-pressure bypass valve of the steam turbine and the main steam pipeline 96 of the steam turbine. The existing turbine high-pressure bypass valve 54, the turbine high-pressure bypass valve outlet isolation door 55 and the connecting pipeline are connected to the turbine high-pressure bypass steam pipeline 99 at the other end of the bypass turbine main steam extraction pipeline tee joint 91, and the other end of the turbine main steam pipeline 96 is connected with the boiler 52.

In the above embodiment, preferably, the "water-molten salt-steam reverse heat exchanger" low-pressure water supply system: the system comprises a low-pressure water feeding pump deoxygenation water feeding pipeline 66, a low-pressure water feeding pump 59, a low-pressure water feeding pipeline 68 of a 'water-molten salt-steam inverse transformation heat device' and a 'water-molten salt-steam inverse transformation heat device' low-pressure water feeding isolation door 60 connected with a 'water-molten salt-steam inverse transformation heat device' low-pressure water feeding pipeline interface, wherein the low-pressure water feeding pipeline 66, the low-pressure water feeding pump, the 'water-molten salt-steam inverse transformation heat device' and the 'water-molten salt-steam inverse transformation heat device' are led out from an existing boiler water feeding deoxygenator 86 of a unit.

In the above embodiments, preferably the molten salt releases heat for the plant/industrial steam system: the system is led out by a 'water-molten salt-steam inverse transformation heat device', and is connected to the existing plant/industrial steam pipeline of the unit through a set molten salt heat release plant/industrial steam pipeline 84, a 'water-molten salt-steam inverse transformation heat device' plant/industrial steam isolating door 76 and a plant/industrial steam pipeline check valve 78.

In the above embodiment, preferably, the thermal power flexibility "active balance" process monitoring control system includes a power grid dispatching center remote terminal control system RTU1, a power plant PMU 5, a thermal power generating unit DCS 6, a thermal power flexibility "active balance" process control system 17, a flywheel energy storage frequency modulation energy management system EMU18, and a molten salt energy storage frequency modulation control system DCS 19.

The thermal power flexibility active balance process control system DCS17 is respectively connected with a power grid dispatching center remote terminal control system RTU1, a unit DCS 6, a flywheel energy storage frequency modulation energy management system EMU18 and a fused salt energy storage frequency modulation control system DCS 19; and the power plant PMU 5 is connected with a remote terminal control system RTU1 of a power grid dispatching center, a unit DCS 6 and a flywheel energy storage frequency modulation energy management system EMU 18.

Specifically, a flexible thermal power active balance process control system DCS17 receives a power grid dispatching center RTU1AGC dispatching power instruction and generating power information of a unit DCS 6, sends control information to a flywheel energy storage frequency modulation energy management system EMU18 and a molten salt energy storage frequency modulation control system DCS 19 after processing, the flywheel energy storage frequency modulation energy management system EMU18 controls the running power of electricity generated by the flywheel energy storage frequency modulation system, the molten salt energy storage frequency modulation control system DCS 19 controls the electric power used by a controllable load molten salt electric heating device and the steam supply amount of a water-molten salt-steam inversion heat exchange system balance unit and the heat storage or heat release of the molten salt energy storage device, and the active balance service of the thermal power unit or the power system is achieved.

The following introduces each functional module of the thermal power flexibility multi-source coordination 'active balance' process system provided by this embodiment:

the cold salt supply function of the molten salt electric heating device is realized by a cold salt tank salt supply pipeline 42 arranged between an inlet pipeline of a cold salt pump and a three-way 41 connector of a cold salt pump salt supply door outlet pipeline and a cold salt tank cold salt supply pipeline 38 arranged between the three-way 41 connector of the cold salt pump salt supply door outlet pipeline and a cold salt inlet pipeline connector of the molten salt electric heating device, wherein a cold salt pump 33 and a cold salt pump salt supply door 34 are arranged on a cold salt tank 31, and a cold salt isolation door 35 of the molten salt electric heating device is arranged on the cold salt supply pipeline 38 of the molten salt electric heating device;

the hot salt supply function of the molten salt electric heating device is realized by a molten salt electric heating device hot salt supply pipeline 49 arranged at the interface from a water-molten salt-steam inverse transformation heat device hot salt outlet pipeline to a molten salt electric heating device hot salt inlet pipeline, a molten salt-steam inverse transformation heat device hot salt outlet isolating door 48 arranged in the pipeline and a molten salt electric heating device hot salt supply isolating door 51;

the hot salt returning function of the molten salt electric heating device is realized by a hot salt returning pipeline 46 of the molten salt electric heating device arranged between a hot salt outlet pipeline interface of the molten salt electric heating device and a hot salt inlet pipeline interface of a hot salt tank and a hot salt tank returning door 45 arranged on the hot salt returning pipeline 46;

the cold salt supply function of the 'water-molten salt-steam inverse transformation heat device' is realized by a cold salt tank salt supply pipeline 42 arranged between the three-way joint of the cold salt pump inlet pipeline and the cold salt pump salt supply door outlet pipeline 41 and a 'water-molten salt-steam inverse transformation heat device' cold salt supply pipeline 39 arranged between the three-way joint of the cold salt pump salt supply door outlet pipeline and the cold salt inlet pipeline joint of the 'water-molten salt-steam inverse transformation heat device', wherein a 'water-molten salt-steam inverse transformation heat device' cold salt supply isolating door 36 is arranged on the 'water-molten salt-steam inverse transformation heat device' cold salt supply pipeline 39;

the hot salt of "water-molten salt-steam inverse transformation heat transfer device" returns the salt function, and the steam supply parameter according to "water-molten salt-steam contravariant heat transfer system" confirms, the utility model discloses the hot salt that selects according to high parameter returns the salt function, is the hot salt of aforementioned molten salt electric heater and supplies the salt function, also can be led to the hot salt jar entry by the export of "water-molten salt-steam inverse transformation heat transfer device" hot salt according to molten salt performance and the steam supply parameter of "water-molten salt-steam contravariant heat transfer system";

the salt return function of the cold salt tank is realized by a cold salt return pipeline 40 of a water-molten salt-steam inverse transformation heat device arranged between a cold salt outlet pipeline interface of the water-molten salt-steam inverse transformation heat device and a cold salt return isolating door 37 of the water-molten salt-steam inverse transformation heat device on the cold salt return pipeline 40;

the salt feeding function of the hot salt tank is realized by arranging a hot salt feeding pipeline 50 of a 'water-molten salt-steam inverse transformation heat device' and a hot salt outlet isolating door 48 of the 'water-molten salt-steam inverse transformation heat device' between a hot salt tank 31 and a hot salt pump inlet and a hot salt inlet pipeline interface of the 'water-molten salt-steam inverse transformation heat device', wherein a hot salt pump 43 and a hot salt pump salt feeding door 44 are arranged on the hot salt tank 32;

the electric heating device has the functions of cold salt heat absorption and heat storage of the energy storage device, and is realized by mutually matching a cold salt tank 31, a cold salt tank salt supply pipeline 42, a cold salt pump 33, a cold salt supply door 34, a cold salt pump salt supply door outlet pipeline tee 41, a 'water-molten salt-steam inverse transformation heat device' cold salt supply isolating door 36, a molten salt electric heating device cold salt supply pipeline 38, a molten salt electric heating device cold salt supply isolating door 35, a molten salt electric heater 27, a molten salt electric heating device hot salt return pipeline 46, a hot salt tank salt return door 45 and a hot salt tank 32;

the steam heating cold salt, the electric heating hot salt heat absorption and the energy storage device heat storage function are realized by a cold salt tank 31, a cold salt tank salt supply pipeline 42, a cold salt pump 33, a cold salt supply door 34 and a cold salt pump salt supply door outlet pipeline tee joint 41, the system comprises a water-molten salt-steam inverse transformation heat device cold salt supply pipeline 39, a water-molten salt-steam inverse transformation heat device cold salt supply isolating door 36, a water-molten salt-steam inverse transformation heat device 47, a water-molten salt-steam inverse transformation heat device heat salt outlet isolating door 48, a molten salt electric heating device heat salt supply pipeline 49, a molten salt electric heating device heat salt supply isolating door 51, a molten salt electric heater 27, a molten salt electric heating device heat salt return pipeline 46, a heat salt tank return door 45, a heat salt tank 32, a corresponding molten salt electric heating device cold salt supply isolating door 35 and a corresponding molten salt pump outlet supply door 44 which are matched with one another;

the molten salt heat release and energy storage device has the heat release function and is realized by the mutual matching of a hot salt tank 32, a hot salt pump 43, a hot salt pump salt supply door 44, a water-molten salt-steam inverse transformation heat device hot salt supply pipeline 50, a water-molten salt-steam inverse transformation heat device 47, a cold salt return pipeline 40, a water-molten salt-steam inverse transformation heat device cold salt return isolating door 37, a cold salt tank 31, a corresponding water-molten salt-steam inverse transformation heat device water and steam side systems and a cold salt supply isolating door 36;

the energy storage device releases heat, the 'water-molten salt-steam inverse transformation heat device' molten salt heat release, and the boiler deoxidized water supply plant/industrial steam function are connected with the unit plant/industrial steam supply pipeline through a boiler water supply deaerator 86, a low-pressure water supply pump deoxidized water supply pipeline 66, a low-pressure water supply pump 59, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply pipeline 68, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply isolation door 60, a 'water-molten salt-steam inverse transformation heat device' 47 and plant/industrial steam pipeline isolation door 76 thereof, a molten salt heat release plant/industrial steam pipeline 84, a 'water-molten salt-steam inverse transformation heat device' plant/industrial steam check door 78. Correspondingly closing a steam and water side pipeline valve steam temperature-reducing plant use/industrial steam isolating door 77, an auxiliary main steam isolating door 88, a steam inlet main pipe isolating door 89, a high-pressure water supply inlet isolating door 62 and a drainage isolating door 63 which are connected with a water-molten salt-steam inverse transformation heat exchanger, and realizing heat release matching of an energy storage device;

the energy storage device releases heat, the 'water-molten salt-steam inverse transformation heat device' molten salt heat release and steam turbine high-pressure heater water supply system 58 supplies water and main steam to the main steam function, the boiler water supply deaerator 86 deaerates the water supply pipeline 65 through the boiler water supply pump, the boiler water supply pump 87, the steam turbine high-pressure heater water supply system 58, the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply pipeline 67 and the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply inlet isolating door 62, the 'water-molten salt-steam inverse transformation heat device' 47, the 'water-molten salt-steam inverse transformation heat device' auxiliary main steam supply pipeline 80 and the auxiliary main steam isolating door 88 thereon, the steam turbine auxiliary main steam high-pressure bypass pipeline steam inlet isolating door 71, the steam turbine high-pressure bypass pipeline 99 and the steam turbine high-pressure bypass valve steam inlet isolating door 70 thereon, The main steam pipeline 96 of the steam turbine and the steam inlet adjusting door 57-1 of the high-pressure cylinder of the steam turbine enter the high-pressure cylinder 53-1 of the steam turbine, and the energy storage devices of the outlet isolation door 55 of the high-pressure bypass valve of the steam turbine and the steam inlet isolation door 70 of the high-pressure bypass valve of the steam turbine are correspondingly closed to realize heat release in a matching way;

the main steam of the bypass turbine is used for temperature reduction of industrial steam for plant/the molten salt heat absorption and energy storage device of the water-molten salt-steam inverse conversion heat device, the main steam of the turbine 52 and the high-pressure bypass steam pipeline tee 97 enter the main steam pipeline 96 of the turbine and the high-pressure bypass steam pipeline 99 of the turbine respectively, one of the main steam pipeline enters a steam inlet isolation door 70 of the turbine high-pressure bypass valve, a steam extraction isolation door 56 of the water-molten salt-steam inverse conversion heat device and the main steam extraction isolation door 81 of the bypass turbine on the main steam extraction pipeline 81 of the bypass turbine, a pressure regulating valve 74 of the main steam extraction of the bypass turbine, a water-molten salt-steam inverse conversion heat device steam temperature reduction device, steam temperature reduction of steam for plant/industrial steam pipeline 83 and a steam temperature reduction plant/industrial steam isolation door 77 of the steam for plant/industrial steam for molten salt heat release plant/industrial steam pipeline 84, The factory-supply/industrial steam check valve 78 of the 'water-molten salt-steam inverse heat conversion device' is connected to a factory-supply/industrial steam supply pipeline of a unit, and one path of steam enters the high-pressure cylinder 53-1 of the steam turbine through the steam inlet adjusting valve 57-1 of the high-pressure cylinder. Correspondingly adjusting a steam inlet adjusting door 57-1 of a high-pressure steam cylinder of the steam turbine, closing an auxiliary main steam high-pressure bypass pipeline steam inlet isolating door 71 of the steam turbine, an outlet isolating door 55 of the high-pressure bypass valve of the steam turbine, a bypass steam supply pipeline isolating door 73 of a reheating thermal section of the steam turbine, a water-molten salt-steam inverse transformation heat device, an auxiliary main steam isolating door 88 for supply, a plant/industrial steam pipeline isolating door 76, a steam inlet main pipe 79 of the water-molten salt-steam inverse transformation heat device, a plant/industrial steam pipeline isolating door 76, a low-pressure water supply isolating door 60, a high-pressure water supply inlet isolating door 62 and a drainage isolating door 63 on the steam inlet main pipe 79, and realizing heat storage matching of an energy storage device;

the bypass steam reheating steam temperature-reducing supply/industrial steam for plant, the molten salt heat absorption and energy storage device heat storage functions of the water-molten salt-steam inverse transformation heat device are realized by a boiler 52 through a steam pipeline 98 of a reheating hot section of a steam turbine and an inlet isolation door 72 of a low-pressure bypass valve on the steam pipeline, a steam supply pipeline 82 of the reheating hot section of the bypass steam turbine and a steam supply pipeline isolation door 73 of the reheating hot section of the steam turbine, a check valve 92 of a bypass steam supply pipeline of the reheating hot section of the steam turbine, a steam inlet main pipe 79 and a steam inlet main pipe isolation door 89 of the water-molten salt-steam inverse transformation heat device, a steam temperature-reducing device, a steam temperature-reducing supply/industrial steam pipeline 83 and a steam temperature-reducing supply/industrial steam isolation door 77 on the steam pipeline 83, a molten salt heat-releasing supply/industrial steam pipeline 84, The 'water-molten salt-steam inverse transformation heat device' for plant/industrial steam check valve 78 is connected to a plant/industrial steam supply pipeline, the steam inlet adjusting valve 57-2 of the steam turbine intermediate pressure cylinder is correspondingly adjusted, and the steam and water side pipeline valves connected with the 'water-molten salt-steam inverse transformation heat device' are closed, and are provided with a steam turbine low-pressure bypass valve outlet isolating door 75, a high-pressure bypass steam supply isolating door 56, a 'water-molten salt-steam inverse transformation heat device' for auxiliary main steam isolating door 88, a plant/industrial steam pipeline isolating door 76, a high-pressure water supply inlet isolating door 62 and a drainage isolating door 63, and the energy storage device is realized by heat storage and matching;

the bypass turbine main steam 'water-molten salt-steam inverse transformation heat device' has heat exchange and energy storage functions, and the boiler 52 passes through a turbine main steam pipeline 96, a turbine high-pressure bypass steam pipeline 99 and a turbine high-pressure bypass valve steam inlet isolation door 70 on the turbine high-pressure bypass steam pipeline 99, a 'water-molten salt-steam inverse transformation heat device' bypass turbine main steam extraction pipeline 81 and a high-pressure bypass steam supply isolation door 56 and a bypass turbine main steam extraction pressure regulating valve 74 on the bypass turbine main steam extraction pipeline, a 'water-molten salt-steam inverse transformation heat device' 47, a 'water-molten salt-steam inverse transformation heat device' drain pipeline 69 and a drain isolation door 63 on the drain pipeline, a drain regulation door 64 and a boiler water feeding deaerator 86. Correspondingly adjusting a steam inlet adjusting door 57-1 of a high-pressure steam cylinder of the steam turbine, closing an auxiliary main steam high-pressure bypass pipeline steam inlet isolating door 71 of the steam turbine, a steam turbine high-pressure bypass valve outlet isolating door 55, a steam turbine reheating thermal section bypass steam supply pipeline isolating door 73, a 'water-molten salt-steam inverse transformation heat device' steam temperature reduction supply plant/industrial steam isolating door 77, an auxiliary main steam supply isolating door 88, a plant/industrial steam pipeline isolating door 76, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply isolating door 60 and a high-pressure water supply inlet isolating door 62, and realizing heat storage matching of an energy storage device;

the bypass turbine reheating section steam ' water-molten salt-steam inverse transformation heat exchanger ' has heat exchange and energy storage functions, and the boiler 52 passes through a turbine reheating section steam pipeline 98 and a turbine low-pressure bypass valve inlet isolation door 72 arranged on the turbine reheating section steam pipeline, a bypass turbine reheating section steam supply pipeline 82 and a turbine reheating section bypass steam supply pipeline isolation door 73 arranged on the bypass turbine reheating section steam supply pipeline, a turbine reheating section bypass steam supply pipeline check valve 92, a ' water-molten salt-steam inverse transformation heat exchanger ' steam inlet main pipe 79 and a steam inlet main pipe isolation door 89, a ' water-molten salt-steam inverse transformation heat exchanger ' 47, a ' water-molten salt-steam inverse transformation heat exchanger ' drain pipeline 69 and a drain isolation door 63 arranged on the water-molten salt-steam inverse transformation heat exchanger ' 69, a drain adjusting door 64 and a boiler feed water deaerator 86. Correspondingly, the steam inlet adjusting valve 57-2 of the steam turbine intermediate pressure cylinder, the steam and water side pipeline valves for closing the steam and water side pipeline valves connected with the water-molten salt-steam inverse transformation heat device are provided with a steam turbine low-pressure bypass valve outlet isolating door 75, a high-pressure bypass steam supply isolating door 56, a water-molten salt-steam inverse transformation heat device auxiliary main steam supply isolating door 88, a plant/industrial steam pipeline isolating door 76, a water-molten salt-steam inverse transformation heat device low-pressure water supply isolating door 60 and a high-pressure water supply inlet isolating door 62, the heat storage of the energy storage device is realized in a matched mode, and the heat storage of the energy storage device is realized in a matched mode.

Example 2

Based on the thermal power flexibility multi-source coordination 'active balance' process system provided by embodiment 1, the embodiment takes the flywheel energy storage frequency modulation system providing the rotational inertia and/or primary frequency modulation active balance service as an example, and introduces an application method of the thermal power flexibility multi-source coordination 'active balance' process system.

The primary frequency modulation active balance service is provided by adjusting active output to reduce frequency deviation through rapid frequency response by a flywheel energy storage frequency modulation system when the frequency of a power grid system where a unit is located deviates from a target frequency. The method mainly comprises the following two types:

the first type is based on power information sent by a power plant PMU, and a flywheel energy storage frequency modulation system replaces the primary frequency modulation function of a conventional thermal power generating unit.

1) The flywheel energy storage frequency modulation energy management system EMU18 receives power information of a PMU 05 of a power plant or a separately-arranged high-precision power grid power meter and receives flywheel energy storage device array energy information of a flywheel energy storage device array inverter PCS 23;

2) the flywheel energy storage frequency modulation energy management system EMU18 calculates the frequency disturbance quantity according to the received power information measured by the power plant PMU 5 or a high-precision power grid frequency meter which is independently arranged, 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;

3) after receiving a charging and discharging power instruction of a flywheel energy storage frequency modulation energy management system EMU18, the flywheel energy storage device array inverter PCS 23 schedules and controls the charging and discharging power of a flywheel energy storage array management system FMS 24;

4) after receiving the charging and discharging power control instruction of 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.

And in the second category, based on a scheduling power instruction sent by a power grid scheduling center (RTU), the flywheel energy storage frequency modulation system independently provides auxiliary services of rotational inertia and primary frequency modulation active balance for a power grid.

Comprises the following steps

1) The method comprises the following steps that a power grid dispatching center RTU1 sends a dispatching power instruction to a flywheel energy storage frequency modulation energy management system EMU18 through a thermal power flexibility active power balance process control system DCS17 or directly;

2) after receiving an AGC (automatic gain control) scheduling power instruction of a thermal power flexibility active balance process control system DCS17 or a power grid scheduling center RTU1, a flywheel energy storage frequency modulation energy management system EMU18 schedules and controls the charging and discharging power of a flywheel energy storage device array inverter PCS 23;

3) after receiving a charging and discharging power instruction of a flywheel energy storage frequency modulation energy management system EMU18, a flywheel energy storage device array inverter PCS 23 schedules and controls the charging and discharging power of a flywheel array management system FMS 24;

4) after receiving the charging and discharging power control instruction of 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.

As shown in fig. 4, a comparison graph of the primary frequency modulation effect of the thermal power generating unit replaced by the flywheel energy storage frequency modulation system is shown. As can be seen, the time of the whole process of the flywheel energy storage frequency modulation system responding to 0-100% target power is less than 200 milliseconds. The charging and discharging power and the stored electric quantity of the flywheel energy storage frequency modulation system can reduce the power grid frequency change amplitude at the initial stage (within 2-10 s) of the power system fault, and improve the frequency at the lowest point or reduce the frequency at the highest point at the initial stage of the power grid fault. Compared with a conventional thermal power generating unit, the flywheel energy storage frequency modulation system has the characteristics of constant-power quick response, short-time support and no-rotation inertial potential energy recovery, so that the flywheel energy storage frequency modulation system can be coordinated with the time delay and the persistence of other conventional frequency modulation power supplies to give full play to respective advantages, and therefore the power grid frequency under the transient fault of a power system is better supported.

The requirements of 5.3.1 in the Primary frequency modulation test and Performance acceptance guide rule of thermal generator sets (GB/T30370-2013) are as follows:

a) the response lag time of the unit participating in primary frequency modulation is less than 3 s.

b) The time for the coal burning unit to reach 75% of the target load should be no more than 15 seconds.

c) The time for the coal burning unit to reach 90% of the target load should not be more than 30 s.

d) The stabilization time of the unit participating in the primary frequency modulation is less than 1 min.

Taking a 350MW thermal power generating unit as an example, the requirement of the guide rule is difficult to achieve under 50% load, and the primary frequency modulation dynamic performance in the 50% -85% rated load range is as follows:

a) the response lag time of the unit participating in primary frequency modulation is usually more than 2s,

b) the average regulating time of active power is usually more than 30 s;

c) the time for the coal fired unit to reach 75% target load is typically greater than 15 s;

d) the time for the coal-fired unit to reach 90% of the target load is not more than 30 s;

e) the stabilization time of the unit participating in primary frequency modulation is more than 1 min.

The rotational speed irregularity is calculated as 5%, and the theoretical power/frequency adjustment amount is about 1.165MW/r/min, namely 2.33.MW/0.0165Hz and 14MW/0.1 Hz.

The configuration example of the main technical parameters of the flywheel energy storage frequency modulation system is as follows:

according to the primary frequency modulation amplitude limiting standard in 5.3 GB/T40595-2021 grid-connected power primary frequency modulation technical regulation and test guide rules, taking a 350MW thermal power generating unit as an example, the variation range of the primary frequency modulation power is not less than +/-8% of rated active power, and the technical parameter configuration of the flywheel energy storage frequency modulation system is as follows:

rating: the charge and discharge power is 28 MW; the charge-discharge multiplying power is 2C; the energy storage time is 6 min; the time delay of primary frequency modulation is less than 200 milliseconds;

remarking: c represents the charge/discharge rate of the energy storage system, i.e., the ratio of the current magnitudes when the energy storage system is charged/discharged, and is generally represented by the letter C. For example, under a rated energy storage capacity, the energy storage system is discharged for 1 hour, which is called 1C discharge, and discharged for 0.5 hour, which is called 2C discharge.

According to the reports of relevant documents, the method for restraining the out-of-limit of the grid frequency comprises the following steps: the frequency drops to 49.9HZ 0t to act, and the required energy storage duration is 4 minutes; and (3) suppressing low-frequency load shedding: the frequency is dropped to 49.75HZ 0t action, and the required energy storage duration is 6 minutes. The specific application is determined according to frequency characteristic tests or simulation calculation of a power grid system where the unit is located.

When the operation of the thermal power generating unit adopts an AGC control mode, for second-level AGC dispatching instructions with short duration and frequent retracing, the primary frequency modulation adjustment quality of the thermal power generating unit is influenced due to the characteristic of inertial response delay of the thermal power generating unit, and even secondary frequency modulation and primary frequency modulation are opposite frequently. The flywheel energy storage frequency modulation system is used for replacing the primary frequency modulation of the unit, a primary frequency modulation input button and a primary frequency modulation output button can be arranged in a unit control system such as a thermal power generating unit DCS 6, and when the flywheel energy storage frequency modulation system is put into operation, the primary frequency modulation function in the unit control system is set to be in an output state, so that mutual interference between AGC frequency modulation adjustment and the primary frequency modulation adjustment of the unit can be effectively avoided. The flywheel energy storage frequency modulation system is arranged, and the design of the original primary frequency modulation scheme of the DEH control system and the CCS coordination control system of the unit is not changed.

Example 3

Based on the thermal power flexibility multi-source coordination 'active balance' process system provided by embodiment 1, the embodiment takes the flywheel energy storage frequency modulation system, the flywheel energy storage frequency modulation system and/or the molten salt energy storage frequency modulation system as an example to be fused with a thermal power generating unit to provide the secondary frequency modulation active balance service of the power system, and introduces an application method of the thermal power flexibility multi-source coordination 'active balance' process system.

The secondary frequency modulation of the 'active balance' process system is coordinated by multiple sources according to the flexibility of thermal power, and the secondary frequency modulation is performed by tracking an instruction issued by a power dispatching mechanism through an automatic power control technology comprising Automatic Generation Control (AGC) and Automatic Power Control (APC) according to an adjusting rate specified by national power grid standards so as to meet the service requirements of the Automatic Generation Control (AGC) and the Automatic Power Control (APC) of a power system.

This embodiment can be divided into two cases:

the first type: and providing a secondary frequency modulation active power balance service of the power system based on AGC (automatic gain control) regulation target power instruction information of a power grid dispatching center RTU and generating power state information sent by a DCS (distributed control system) of the thermal power generating unit.

The method mainly comprises the following steps:

1) the method comprises the steps that a thermal power flexibility active balance process control system DCS17 receives AGC power target instruction information sent by a power grid dispatching center RTU1 and thermal power unit generating power state information sent by a thermal power unit DCS 6;

2) the thermal power flexibility active balance process control system DCS17 compares and analyzes the completion quality of the power generation power of the thermal power unit DCS 6 to a power grid dispatching center RTU1AGC dispatching power instruction according to the stored energy and the running state of the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system and the AGC frequency modulation dynamic performance state of the thermal power unit DCS 6, and adaptively schedules and controls the thermal power flexibility multi-source coordination power generation and power utilization operation of the thermal power flexibility active balance process system.

The second type: and adjusting a target power instruction by AGC based on a power grid dispatching center RTU, and providing an active balance service of secondary frequency modulation of the power system by fusing a flywheel energy storage frequency modulation system, a flywheel energy storage frequency modulation system and/or a molten salt energy storage frequency modulation system with a thermal power generating unit.

Taking the statistical coverage rate data of AGC (automatic gain control) scheduling power/duration frequency modulation instructions of a certain 330MW thermal power generating unit as an example:

AGC single frequency modulation instruction: the ratio of the target power is less than or equal to 18MW (5.5 percent of rated power) and is more than 97 percent, and the ratio of the time length is less than or equal to 6min and is more than or equal to 91 percent; and (3) continuously adjusting the instruction for more than two times in the AGC single direction: the ratio of the target power less than or equal to 18MW (5.5 percent of rated power) is more than 22 percent, the ratio of the target power less than or equal to 42MW (12.7 percent of rated power) is more than 98 percent, the ratio of the target power less than or equal to 5min is less than or equal to 37 percent, and the ratio of the target power more than or equal to 13 min is less than 3 percent.

Therefore, the present embodiment is divided into two cases according to the power grid dispatching center RTU1AGC adjustment target power value:

in the first case: power grid dispatching center RTU1AGC adjusting target power < (8% unit rated power + unit basic adjusting speed x unit rated power)

At the moment, the application of a thermal power flexibility multi-source coordination 'active power balance' process system combining a flywheel energy storage frequency modulation system with AGC frequency modulation of a thermal power unit comprises the following steps:

1) determining the adjusting rate in the full-load adjusting range of the thermal power generating unit;

2) determining the percentage of the remaining electric quantity of the flywheel energy storage frequency modulation system SOC (state of charge);

3) the thermal power generating unit responds to a power grid dispatching center RTU1AGC to adjust target power according to self capacity;

4) the flywheel energy storage frequency modulation energy management system EMU18 sequentially schedules and controls a flywheel energy storage device array inverter PCS 23, a flywheel energy storage device array management system FMS 24, a flywheel energy storage device converter FCS 25 and a flywheel energy storage device 26 to regulate the running of electric power for generation according to the difference between a target power instruction regulated by a power grid scheduling center RTU1AGC and the real-time generating power of a thermal power generating unit DCS 6 read by a thermal power flexibility active balance process control system DCS 17;

5) firstly, the voltage of a flywheel energy storage device array bus 22 is regulated to run at a constant voltage within a rated parameter range, the charging and discharging multiplying power of a flywheel energy storage device 26 is regulated to be less than or equal to 2C, and when the output power of a thermal power generating unit meets the precision requirement of regulating target power of an RTU1AGC of a power grid dispatching center, a flywheel energy storage frequency modulation system stops outputting power and normally keeps 50 +/-5% SOC for running and standby.

In the second case: the power grid dispatching center RTU1AGC adjusts the target power > (8% set rated power + set basic adjusting speed x set rated power).

Combining a flywheel energy storage frequency modulation system with a fused salt energy storage frequency modulation system to fuse two typical forms of thermal power flexibility multi-source coordination 'active balance' process system application methods of thermal power unit AGC frequency modulation;

in a first form: the fused salt energy storage frequency modulation system is in hot standby, and the fused salt electric heating device is in an operating state:

1) the flywheel energy storage frequency modulation system is combined with the power regulation capacity of a thermal power generating unit for regulating the difference between the accumulated on-grid power and the regulation target power of a power grid dispatching center RTU1AGC (remote terminal unit) to be less than or equal to the power regulation capacity of a molten salt electric heating device in the running state, and the method is mainly applied to the following steps:

firstly, determining that accumulated online power of a flywheel energy storage frequency modulation system combined with a thermal power generating unit is operated in a saturated state;

secondly, the fused salt electric heating device is used as a controllable load, and the fused salt electric heating device is adjusted to be combined with flywheel energy storage frequency modulation system adjustment and thermal power generating unit adjustment to accumulate output power to reach the target power of power grid dispatching center RTU1AGC adjustment;

responding to the power regulation sequence of the power grid dispatching center RTU1AGC, sequentially regulating the power of a DCS 6 generator of the thermal power generating unit, regulating the generating electric power of the flywheel energy storage frequency modulation system by a flywheel energy storage frequency modulation energy management system EMU18, and regulating the power load of the fused salt electric heating device by a fused salt energy storage frequency modulation control system DCS 19.

2) The difference between the adjustment accumulated grid power of the flywheel energy storage combined thermal power generating unit and the adjustment target power of the RTU1AGC of the power grid dispatching center is larger than the adjustment capacity of the molten salt electric heating device in the running state, and the main application method comprises the following steps:

firstly, regulating accumulated on-line power by combining a flywheel energy storage and molten salt electric heating device with a thermal power generating unit to operate in a saturated state;

the 'water-molten salt-steam inversion heat exchange system' is used as a controllable load, and the 'water-molten salt-steam inversion heat exchange device' 47 is adjusted to integrate the accumulated output power of the thermal power unit combined flywheel energy storage frequency modulation system and the molten salt electric heating device to reach the RTU1AGC adjustment target power of the power grid dispatching center;

and responding to the power regulation sequence of the power grid dispatching center RTU1AGC, the thermal power generating unit DCS 6 regulates the power of the generator, the flywheel energy storage frequency modulation energy management system EMU18 regulates the power generation/utilization power of the flywheel energy storage device 26, and the molten salt energy storage frequency modulation control system DCS 19 controls the steam extraction/steam supply flow of the steam turbine in the water-molten salt-steam inversion heat exchange system and regulates the power utilization load of the molten salt electric heating device.

In a second form: hot standby of fused salt energy storage frequency modulation system and non-operation of fused salt electric heating device

When the peak-valley difference of the power grid is large and the variation amplitude of the new energy generated power is large, the RTU1AGC adjusting instruction of the power grid dispatching center is continuously added or subtracted in a single direction, the flywheel energy storage capacity is insufficient in the application method, the unit adjusting speed is maximum, and the accumulated on-grid power and the RTU1AGC adjusting target power of the power grid dispatching center are not balanced:

1) increasing power

Firstly, a water-molten salt-steam inversion heat exchange system is used for a plant/industrial steam system to operate, so that steam extraction of a steam turbine is reduced, and the power generation power is increased;

and secondly, the water-molten salt-steam inversion heat exchange system is used for the main steam system to operate, and the steam inlet flow of the main steam of the steam turbine is increased to increase the power generation power.

2) Reducing power

Firstly, a water-molten salt-steam inversion heat exchange system bypasses main steam or reheat section steam to heat molten salt for heat storage, and drains water to a deaerator;

and secondly, the water-molten salt-steam inversion heat exchange system bypasses the main steam and reheating section steam to heat molten salt for heat storage at the same time, and water is drained to a deaerator.

The second form is not easy to be used for minute-level frequency modulation turn-back operation due to large operation workload of the steam and molten salt system, and is more suitable for the working condition that the daily two-peak two-valley or three-peak two-valley of a small-level power grid, the RTU1AGC adjusting instruction of a power grid dispatching center continuously and unidirectionally adds or subtracts and dispatches the target power with larger change amplitude, the initial operation steam extraction and steam supply turn-back time is preferably more than or equal to 1 hour, and the operation of steam system drainage and steam combination needs to be particularly and fully concerned.

The main configuration technical parameters of the molten salt energy storage frequency modulation system comprise:

power of the molten salt electric heater: the rated power of the unit is more than or equal to 20 percent;

adjusting time of 0-100% rated power of the molten salt electric heating energy storage system: less than 5 min;

energy storage by molten salt: the rated power MW of the unit is more than or equal to 20 percent and is multiplied by 7 hours;

molten salt heat release main steam flow: more than or equal to 15 percent of B-MCR t/h;

adjusting time of 0-100% rated output of molten salt heat release and main steam flow: is less than 5 min.

Example 4

Based on the thermal power flexibility multi-source coordination 'active balance' process system provided by embodiment 1, the embodiment provides a thermal power flexibility multi-source coordination 'active balance' process system which integrates a thermal power unit to form a 'virtual frequency modulation power supply' to provide rotary inertia, primary frequency modulation and secondary frequency modulation 'active balance service' for a power system and a new energy unit, and the application method comprises the following steps:

1) the thermal power flexibility active balance process control system DCS17 uploads the relevant information of the power grid active balance service technical performance such as available power, regulation performance, energy storage capacity and the like of a flywheel energy storage frequency modulation energy management system EMU18 and a fused salt energy storage frequency modulation control system DCS 19 to a power grid dispatching center RTU1 according to the power grid requirements;

2) the method comprises the following steps that a power grid dispatching center RTU1 sends (APC) automatic power control commands to a thermal power flexibility active power balance process control system DCS17 or sends primary frequency modulation control commands to a flywheel energy storage frequency modulation energy management system EMU18, and the flywheel energy storage frequency modulation energy management system EMU18 controls the flywheel energy storage frequency modulation system to perform charging and discharging operation, so that rotational inertia and primary frequency modulation services are provided for a power system;

3) the method comprises the following steps that a power grid dispatching center RTU1 issues (APC) automatic power control instructions to a thermal power flexibility active power balance process control system DCS17, wherein:

power increase adjustment sequence: the flywheel energy storage frequency modulation system generates electricity and operates; the fused salt electric heating device is in load shedding operation; the molten salt energy storage device releases heat, and the 'water-molten salt-steam inversion heat exchange system' is used for plant/industrial steam or main steam to generate electricity;

② power reduction adjustment sequence: the flywheel energy storage frequency modulation system runs by using electricity; the 'water-molten salt-steam inversion heat exchange system' bypasses main steam or reheated steam according to power adjustment requirements, or bypasses the main steam and the reheated steam simultaneously, and the molten salt energy storage device stores heat; and (4) loading the molten salt electric heating device and storing heat of the molten salt energy storage device.

Specifically, the target power reduction direction adjustment method includes:

a. charging the flywheel energy storage frequency modulation system;

b. according to the peak regulation capacity, a fused salt energy storage frequency modulation control system controls a water-fused salt-steam inversion heat exchange system to sequentially select a bypass turbine main steam pressure reduction steam supply system for steam supply and a bypass turbine reheat steam supply system for steam supply; the main steam of the bypass steam turbine is supplied by a pressure reduction steam supply system; the bypass steam turbine supplies steam to the reheat steam supply system, drains water to the deaerator, stores heat in the molten salt energy storage device, and the molten salt electric heating device runs;

c. according to the peak regulation capacity requirement and the requirement of plant/industrial steam heat supply, a fused salt energy storage frequency modulation control system controls a water-fused salt-steam inversion heat exchange system to sequentially select a bypass turbine main steam pressure reduction steam supply system to supply steam and a bypass turbine reheating steam supply system to supply steam; the main steam of the bypass steam turbine is supplied by a pressure reduction steam supply system; the bypass steam turbine supplies steam to a reheat steam supply system, the 'water-molten salt-steam inverse transformation heat device' supplies plant/industrial steam by steam temperature reduction, the molten salt energy storage device stores heat, and the molten salt electric heating device operates;

d. the above b-c modes can also be flexibly combined and adjusted to operate

e. The fused salt electric heating device and the fused salt energy storage device are operated by heat storage.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A flexible multisource coordinated 'active power balance' process system for thermal power is characterized by comprising the following steps:

a flywheel energy storage frequency modulation system, a fused salt energy storage frequency modulation system and a thermal power flexibility active power balance process monitoring control system;

the flywheel energy storage frequency modulation system is connected with a 6kV bus (11) for a thermal power plant;

the molten salt energy storage frequency modulation system comprises a molten salt electric heating device, a molten salt energy storage device and a water-molten salt-steam inversion heat exchange system containing a water-molten salt-steam inversion heat exchange device (47);

the power supply of the molten salt electric heating device is taken from a power plant on-off bus (3), and the molten salt electric heating device is connected with the molten salt energy storage device through a molten salt electric heating device cold salt supply pipeline (38) and a molten salt electric heating device hot salt return pipeline (46);

the salt side pipeline of the 'water-molten salt-steam inverse transformation heat device' (47) is connected with the molten salt energy storage device through a 'water-molten salt-steam inverse transformation heat device' cold salt supply pipeline (39) and a 'water-molten salt-steam inverse transformation heat device' cold salt return pipeline (40), a hot salt supply pipeline (49) of the molten salt electric heating device is connected with the molten salt electric heating device, and the hot salt supply pipeline (49) of the molten salt electric heating device is connected with the molten salt energy storage device after secondary heating by the molten salt electric heating device;

the thermal power flexibility active balance process monitoring and control system is used for monitoring and controlling the flywheel energy storage frequency modulation system and the fused salt energy storage frequency modulation system, and realizing active balance of a unit or a power grid.

2. The thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 1, wherein the flywheel energy storage frequency modulation system comprises a plurality of flywheel energy storage frequency modulation units connected in parallel, each flywheel energy storage frequency modulation unit is connected in parallel to a flywheel energy storage frequency modulation system bus (14) through a flywheel energy storage frequency modulation unit transformer (16), and is connected to a thermal power plant service 6kV bus (11) through a flywheel energy storage frequency modulation system bus isolating switch (15);

each flywheel energy storage frequency modulation unit comprises at least one group of flywheel energy storage device array inverters PCS (23), each flywheel energy storage device array inverter PCS (23) is connected with a flywheel energy storage frequency modulation unit bus (21) through a flywheel energy storage device array inverter alternating current isolating switch, and the flywheel energy storage frequency modulation unit bus (21) is connected with the flywheel energy storage frequency modulation unit transformer (16) through the flywheel energy storage frequency modulation unit isolating switch (20).

3. A thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 2, wherein each said flywheel energy storage device array inverter PCS (23) is further connected to at least one flywheel energy storage device module by a flywheel energy storage device array bus (22); each flywheel energy storage device module consists of a flywheel energy storage array management system FMS (24) and a plurality of flywheel energy storage device modules, each flywheel energy storage device module is connected to the flywheel energy storage device array bus (22) through a flywheel energy storage device converter direct current switch, the flywheel energy storage device array inverter PCS (23) controls the corresponding flywheel energy storage array management system FMS (24), the flywheel energy storage array management system FMS (24) controls the corresponding flywheel energy storage device converter FCS (25), and each flywheel energy storage device converter FCS (25) controls one flywheel energy storage device (26).

4. A thermal-power flexibility multi-source coordinated active balance process system as claimed in claim 1, wherein said molten salt electric heating device is provided with a molten salt electric heating device power system and a molten salt electric heater (27);

the power supply system of the molten salt electric heating device comprises a power plant switch plant bus power supply isolating switch (28), a molten salt electric heating device power supply transformer (7), a molten salt electric heating device power supply transformer power supply isolating switch (29) and a molten salt electric heater power supply isolating switch (30) which are sequentially connected, and the other side of the molten salt electric heater power supply isolating switch (30) is connected with the molten salt electric heater (27);

the molten salt electric heater (27) is connected with the molten salt energy storage device through a molten salt electric heating device cold salt supply pipeline (38), and a cold salt supply isolation door (35) is arranged on the molten salt electric heating device cold salt supply pipeline (38); the molten salt electric heater (27) is connected with the 'water-molten salt-steam inverse transformation heat device' (47) through a molten salt electric heating device hot salt supply pipeline (49), and a molten salt electric heating device hot salt supply isolating door (51) and a 'water-molten salt-steam inverse transformation heat device' hot salt outlet isolating door (48) are arranged on the molten salt electric heating device hot salt supply pipeline (49); the molten salt electric heater (27) is connected with the molten salt energy storage device through a molten salt electric heating device hot salt return pipeline (46), and a hot salt tank return salt door (45) is arranged on the molten salt electric heating device hot salt return pipeline (46).

5. A thermal-power flexibility multi-source coordination 'active balance' process system as claimed in claim 4, characterized in that said molten salt energy storage device comprises a cold salt tank (31) and a hot salt tank (32);

the cold salt tank (31) is connected with 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 inverse transformation heat device through the cold salt supply pipeline (42), and a cold salt pump (33) and a cold salt pump salt supply door (34) are arranged on the cold salt supply pipeline (42); the cold salt tank (31) is also connected with the water-molten salt-steam inverse transformation heat device (47) through a salt return pipeline (40) of the water-molten salt-steam inverse transformation heat device, and a cold salt return isolating door (37) of the water-molten salt-steam inverse transformation heat device is arranged on the salt return pipeline (40) of the water-molten salt-steam inverse transformation heat device;

the hot salt tank (32) is connected with the hot salt tank salt supply pipeline (50) and the 'water-molten salt-steam inverse transformation heat device' (47) through a hot salt pump (43) and a hot salt pump outlet salt supply door (44), and is connected with the molten salt electric heater (27) through the molten salt electric heating device hot salt return pipeline (46).

6. The thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 1, wherein the water-molten salt-steam inversion heat exchange system further comprises a molten salt heat storage auxiliary peak regulation system and a molten salt heat release auxiliary peak regulation system;

the molten salt heat storage auxiliary peak regulation system comprises a bypass turbine main steam pressure reduction steam supply system, a bypass turbine reheating heat section steam supply system, a steam temperature reduction plant supply/industrial steam system and a 'water-molten salt-steam inverse transformation heat device' drainage system;

the molten salt heat release auxiliary peak regulation system comprises a high-pressure water supply system of a 'water-molten salt-steam inverse transformation heat device', a molten salt heat release main steam supply system, a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply system and a molten salt heat release plant/industrial steam system;

the steam side pipeline of the water-molten salt-steam inverse heat conversion device (47) is respectively connected with the bypass turbine main steam pressure reduction steam supply system, the bypass turbine reheating thermal section steam extraction system, the steam temperature reduction plant supply/industrial steam system, the molten salt heat release supply main steam system and the molten salt heat release plant supply/industrial steam system; and a water side pipeline of the 'water-molten salt-steam reverse conversion heat device' (47) is respectively connected with a 'water-molten salt-steam reverse conversion heat device' high-pressure water supply system, a 'water-molten salt-steam reverse conversion heat device' low-pressure water supply system and a 'water-molten salt-steam reverse conversion heat device' drainage system.

7. The thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 6, wherein a steam desuperheater, a condenser and a hydrophobic cooler which are connected in sequence are arranged in the 'water-molten salt-steam inverse transformation heat device' (47) and used for realizing forward molten salt heat absorption; and the feed water preheater, the steam generator and the steam superheater are connected in sequence and used for realizing a reverse heat release function.

8. The thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 6, wherein the 'water-molten salt-steam inverse transformation heat device' high-pressure water supply system comprises a boiler feed pump deoxygenation water supply pipeline (65) led out of a thermal power unit boiler feed water deoxygenator (86), a boiler feed water pump (87), a boiler high-pressure feed water pump outlet isolation door (61), a steam turbine high-pressure heater water supply system (58), a 'water-molten salt-steam inverse transformation heat device' boiler high-pressure water supply pipeline tee joint (95), a 'water-molten salt-steam inverse transformation heat device' high-pressure water supply pipeline (67) and a 'water-molten salt-steam inverse transformation heat device' high-pressure water supply inlet isolation door (62) arranged on the high-pressure water supply pipeline;

the low-pressure water supply system of the 'water-molten salt-steam inverse transformation heat device' comprises a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply pump deoxygenation water supply pipeline (66) led out from a thermal power generating unit boiler water supply deaerator (86), a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply pump (59), a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply pipeline (68) and a 'water-molten salt-steam inverse transformation heat device' low-pressure water supply isolation door (60) arranged on the 'water-molten salt-steam inverse transformation heat device' low-pressure water supply isolation pipeline;

the drainage system of the water-molten salt-steam inverse transformation heat device comprises a drainage pipeline (69) of the water-molten salt-steam inverse transformation heat device led out from the water-molten salt-steam inverse transformation heat device (47), a drainage isolation door (63) and a drainage adjusting door (64), wherein the drainage isolation door (63) and the drainage adjusting door (64) are arranged on the drainage pipeline, and the other end of the drainage pipeline (69) of the water-molten salt-steam inverse transformation heat device is connected to a water supply deaerator (86) of the boiler of the thermal power generating unit.

9. The thermal power flexibility multi-source coordination 'active balance' process system as claimed in claim 6, wherein the bypass turbine main steam pressure reduction steam supply system comprises a high-pressure bypass steam pipeline tee joint (97) arranged between an existing boiler (52) of the thermal power unit and a steam supply turbine main steam pipeline (96), a turbine high-pressure bypass steam pipeline (99) connected with the other end of the high-pressure bypass steam pipeline tee joint (97) through a turbine high-pressure bypass auxiliary main steam inlet pipeline tee joint (90), a turbine high-pressure bypass valve steam inlet isolation door (70) arranged on the turbine high-pressure bypass steam pipeline (99), a bypass turbine main steam extraction pipeline tee joint (91) arranged at the tail end of the turbine high-pressure bypass steam pipeline (99), and a 'water-molten salt-steam inverse transformation heat device' bypass turbine main steam extraction pipeline (81) led out from the bypass turbine main steam extraction pipeline tee joint (91), the water-molten salt-steam inverse transformation heat device bypass turbine main steam extraction pipeline (81) is connected to a steam inlet main pipe (79) pipeline interface of the water-molten salt-steam inverse transformation heat device (47), a high-pressure bypass steam supply isolation door (56) and a bypass turbine main steam extraction pressure regulating valve (74) are arranged on the water-molten salt-steam inverse transformation heat device bypass turbine main steam extraction pipeline (81), and the other end of a bypass turbine main steam extraction pipeline tee joint (91) is connected with a turbine high-pressure bypass valve (54) and a high-pressure bypass valve outlet isolation door (55);

the bypass turbine reheating thermal section steam extraction system comprises a turbine reheating thermal section steam pipeline (98) led out from the boiler (52), and a steam inlet main pipe (79) pipeline interface of the water-fused salt-steam inverse transformation heating device (47) is connected with the turbine reheating thermal section steam supply pipeline (82) through a turbine low-pressure bypass valve inlet isolation door (72), a turbine reheating thermal section steam supply pipeline tee joint (93) and a bypass turbine reheating thermal section steam supply pipeline (82), a turbine reheating thermal section bypass steam supply pipeline check door (92) and a turbine reheating thermal section bypass steam supply pipeline isolation door (73) are arranged on the bypass turbine reheating thermal section steam supply pipeline (82), a turbine reheating thermal section steam pipeline check door (98) is connected with a turbine low-pressure bypass valve (85) through the other side of the turbine reheating thermal section steam supply pipeline tee joint (93), and a turbine low-pressure bypass valve outlet isolation door (75) and a turbine low-pressure bypass valve outlet isolation door (85) are arranged on the outlet side of the turbine reheating thermal section steam supply pipeline (85) The connecting pipeline (100), the steam pipeline (98) of the reheating section of the steam turbine is also connected with a steam inlet adjusting valve (57-2) of a middle pressure cylinder of the steam turbine;

the steam desuperheating plant/industrial steam system, comprising: the steam temperature-reducing plant/industrial steam pipeline (83) is connected with the water-molten salt-steam inverse transformation heat device (47), the steam temperature-reducing plant/industrial steam pipeline (83) is connected to a plant/industrial steam pipeline through a molten salt heat-releasing and steam temperature-reducing plant/industrial steam pipeline tee joint (94), and the plant/industrial steam pipeline is provided with a plant/industrial steam check valve (78) of a water-molten salt-steam inverse transformation heat device;

the molten salt heat release and main steam supply system comprises an auxiliary main steam supply pipeline (80) of a water-molten salt-steam inverse transformation heat device led out from the water-molten salt-steam inverse transformation heat device (47), an auxiliary main steam isolating door (88) of the auxiliary main steam supply pipeline and a steam inlet isolating door (71) of a steam turbine auxiliary main steam high-pressure bypass pipeline, wherein the other end of the steam inlet isolating door (71) of the steam turbine auxiliary main steam high-pressure bypass pipeline is connected with a steam inlet pipeline tee joint (90) of the steam turbine high-pressure bypass auxiliary main steam;

the molten salt heat release supply plant/industrial steam system comprises a molten salt heat release supply plant/industrial steam pipeline (84) connected with the ' water-molten salt-steam inverse transformation heat device ' (47) and a ' water-molten salt-steam inverse transformation heat device ' supply plant/industrial steam isolating door (76) arranged on the molten salt heat release supply plant/industrial steam inverse transformation heat device ', wherein the other end of the ' water-molten salt-steam inverse transformation heat device ' supply plant/industrial steam isolating door (76) is connected with a third port of the molten salt heat release and steam temperature reduction supply plant/industrial steam pipeline tee joint (94).

10. The thermal power flexibility multi-source coordination 'active balance' process system according to claim 1, characterized in that the thermal power flexibility 'active balance' process monitoring and control system comprises a power grid dispatching center RTU (1), a power plant PMU (5), a thermal power unit DCS (6), a thermal power flexibility 'active balance' process control system DCS (17), a flywheel energy storage frequency modulation energy management system EMU (18) and a molten salt energy storage frequency modulation control system DCS (19); the thermal power flexibility active balance process control system DCS (17) is respectively connected with a power grid dispatching center RTU (1), a thermal power generating unit DCS (6), a flywheel energy storage frequency modulation energy management system EMU (18) and a fused salt energy storage frequency modulation control system DCS (19) through hard wiring and network communication connection interfaces; the power plant PMU (5) is connected with a power grid dispatching center RTU (1), a thermal power generating unit DCS (6) and a flywheel energy storage frequency modulation energy management system EMU (18) through hard wiring and network communication connection interfaces.

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