Method and system for realizing primary frequency modulation under deep peak regulation working condition of thermal power generating unit

Abstract

The invention discloses a method and system for realizing primary frequency modulation under a deep peak regulation working condition of a thermal power generating unit, and the method comprises the steps: carrying out the primary frequency modulation based on the regulating stage pressure pe of a steam turbine under a real-time working condition, the regulating stage pressure pe0 of the steam turbine under a rated working condition, the regulating stage temperature Te0 of the steam turbine under the rated working condition, and the regulating stage temperature Te of the steam turbine under the real-time working condition; calculating the main steam flow G of the steam turbine; calculating the mechanical power Nj of the steam turbine based on the main steam flow G of the steam turbine; based on the internal power variable quantity delta Nj under the real-time change working condition of the steam turbine and the internal power variable quantity delta N0 under the corresponding rated working condition; and based on the internal power variable quantity delta Nj under the real-time change working condition and the internal power variable quantity delta N0 under the rated working condition, a correction value delta PGVj of the variable quantity of the main valve position of the steam turbine under the real-time working condition is calculated. According to the self-adaptive correction method based on the main steam pressure, the primary frequency modulation performance of the unit under the deep peak regulation working condition is improved, and the primary frequency modulation performance of the unit under different working conditions tends to be basically consistent.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more specifically, to a method and system for realizing primary frequency regulation under deep peak regulation conditions of a thermal power unit. Background Art

[0002] At present, most of the thermal power generating units are operated in sliding pressure operation, that is, the main steam pressure is automatically adjusted to the appropriate position with the load size. This is mainly to consider the impact of the control valve interception on the economy, so that the control valve is opened as wide as possible. At present, the primary frequency regulation control strategy of thermal power units is basically completed by DEH and DCS together, that is, when the frequency deviation is greater than the set dead zone, one route is DEH as the feedforward part directly acting on the actuator, and the other route is DCS acting on the power target. The dynamic response characteristics of the primary frequency regulation of the unit are closely related to the control parameters of the control system and the main steam pressure. When the control parameters are reasonably set at a certain load condition, the dynamic response characteristics of the primary frequency regulation meet the assessment indicators. However, when the unit load is changed to a deep peak regulation condition, although the control parameters have not changed under the same frequency deviation, the opening of the DEH feedforward part actuator is the same. Since the main steam pressure of the unit changes lower, the steam work per unit volume is reduced, and its primary frequency regulation dynamic characteristics are very likely to fail to meet the assessment indicators.

[0003] Therefore, a main steam pressure adaptive correction method is needed to improve the primary frequency regulation performance of the unit under deep peak regulation conditions, so that the primary frequency regulation performance of the unit under different conditions tends to be basically consistent. Summary of the invention

[0004] The technical solution of the present invention provides a method and system for realizing primary frequency regulation under deep peak regulation conditions of a thermal power unit, so as to solve the problem of how to improve the primary frequency regulation performance of the unit under deep peak regulation conditions.

[0005] In order to solve the above problems, the present invention provides a method for realizing a frequency regulation under deep peak regulation conditions of a thermal power unit, the method comprising:

[0006] Based on the regulating stage pressure p under the real-time working condition of the steam turbine e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine;

[0007] Based on the main steam flow rate G of the steam turbine, calculate the mechanical power N of the steam turbine j ;

[0008] The internal power variation ΔN based on the real-time changing working conditions of the steam turbine j, and the corresponding internal power change ΔN0 under rated conditions;

[0009] Based on the internal power change ΔN under real-time changing conditions j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj .

[0010] Preferably, the regulating stage pressure p based on the real-time working condition of the steam turbine e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow G of the steam turbine, including:

[0011]

[0012] Among them, G0 is the main steam flow rate under rated conditions.

[0013] Preferably, the mechanical power N of the steam turbine is calculated based on the main steam flow G of the steam turbine. j ,include:

[0014] N j =3600×G×H j × j

[0015] Among them, H j is the effective enthalpy drop, r j is the internal efficiency of the steam turbine.

[0016] Preferably, the internal power variation ΔN based on the real-time changing working condition of the steam turbine j , and the corresponding internal power change ΔN0 under rated conditions, including:

[0017] The internal power change ΔN under real-time changing conditions is calculated by the following formula j :

[0018]

[0019] Among them, Δp e is the pressure change of the regulating stage under rated conditions, ΔT e0 is the change in regulating stage temperature under rated conditions, ΔG0 is the change in main steam flow under rated conditions;

[0020] The corresponding internal power change under rated working conditions is calculated by the following formula:

[0021] ΔN0=3600×ΔG0×H0×r0

[0022] Among them, H0 is the main steam enthalpy drop under rated conditions, and r0 is the internal efficiency of the turbine under rated conditions.

[0023] Preferably, the internal power variation ΔN based on the real-time changing working condition j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj ,include:

[0024]

[0025] Among them, ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

[0026] Based on another aspect of the present invention, the present invention provides a system for realizing primary frequency regulation under deep peak regulation conditions of a thermal power unit, the system comprising:

[0027] The first calculation unit is used to adjust the stage pressure p based on the real-time working conditions of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine;

[0028] The second calculation unit is used to calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine. j ;

[0029] The third calculation unit is used to calculate the internal power change ΔN based on the real-time changing working conditions of the steam turbine. j , and the corresponding internal power change ΔN0 under rated conditions;

[0030] The fourth calculation unit is used to calculate the internal power change ΔN based on the real-time changing working conditions. j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj .

[0031] Preferably, the first calculation unit is used to adjust the stage pressure p based on the real-time working condition of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow G of the steam turbine, and also used for:

[0032]

[0033] Among them, G0 is the main steam flow rate under rated conditions.

[0034] Preferably, the second calculation unit is used to calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine. j , also used for:

[0035] N j =3600×G×H j × j

[0036] Among them, H j is the effective enthalpy drop, r j is the internal efficiency of the steam turbine.

[0037] Preferably, the third calculation unit is used to calculate the internal power variation ΔN based on the real-time changing working conditions of the steam turbine. j , and the corresponding internal power change ΔN0 under rated conditions, are also used for:

[0038] The internal power change ΔN under real-time changing conditions is calculated by the following formula j :

[0039]

[0040] Among them, Δp e is the pressure change of the regulating stage under rated conditions, ΔT e0 is the change in regulating stage temperature under rated conditions, ΔG0 is the change in main steam flow under rated conditions;

[0041] The corresponding internal power change under rated working conditions is calculated by the following formula:

[0042] ΔN0=3600×ΔG0×H0×r0

[0043] Among them, H0 is the main steam enthalpy drop under rated conditions, and r0 is the internal efficiency of the turbine under rated conditions.

[0044] Preferably, the fourth calculation unit is used to calculate the internal power change ΔN based on the real-time changing working condition. j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj , also used for:

[0045]

[0046] Among them, ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

[0047] The technical solution of the present invention provides a method and system for realizing primary frequency regulation under deep peak regulation conditions of a thermal power unit, wherein the method comprises: based on the regulating stage pressure p under the real-time working conditions of the steam turbine e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine; based on the main steam flow rate G of the steam turbine, calculate the mechanical power N of the steam turbine j ; Based on the internal power change ΔN under the real-time changing working conditions of the steam turbine j , and the corresponding internal power change ΔN0 under rated conditions; based on the internal power change ΔN under real-time changing conditions j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj The technical solution of the present invention proposes a method based on main steam pressure adaptive correction to improve the primary frequency regulation performance of the unit under deep peak regulation conditions, so that the primary frequency regulation performance of the unit under different conditions tends to be basically consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0049] Figure 1 It is a flow chart of a method for realizing a frequency regulation under deep peak regulation condition of a thermal power unit according to a preferred embodiment of the present invention;

[0050] Figure 2 A schematic diagram of adaptive coordinated control based on main steam pressure according to a preferred embodiment of the present invention; and

[0051] Figure 3 The present invention is a structural diagram of a system for realizing frequency regulation under deep peak regulation conditions of a thermal power unit according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0052] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0053] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0054] Figure 1 The present invention is a flow chart of a method for realizing frequency regulation under deep peak regulation conditions of a thermal power unit according to a preferred embodiment of the present invention.

[0055] The present invention provides a main steam pressure adaptive correction method, which is introduced into the primary frequency regulation control logic of the unit, so that during the primary frequency regulation of the unit, DEH as a feedforward part is corrected to different degrees according to different pressures, so that the load change caused by the DEH feedforward part is basically consistent with that under other working conditions, thereby improving the primary frequency regulation performance of the unit under deep peak regulation conditions.

[0056] In order to solve the problem that the contribution rate of the primary frequency regulation feedforward part is reduced due to low main steam pressure under the deep peak regulation condition of the current thermal power unit, the present invention provides a main steam pressure adaptive correction method, which can improve the primary frequency regulation performance of the thermal power unit.

[0057] The present invention utilizes the characteristics of the correlation between the main steam pressure, the regulating stage pressure and the work per unit main steam flow in thermodynamic energy, and adds a pressure correction link to the auxiliary group based on the static frequency difference disturbance verification to improve the primary frequency regulation dynamic performance of the unit under deep peak regulation conditions.

[0058] The most critical point of the method for realizing the primary frequency regulation under deep peak regulation conditions of thermal power units based on the adaptive correction of main steam pressure in the present invention is to take the primary frequency regulation dynamic assessment index as the target orientation, introduce the correlation between the real-time main steam flow change and the main steam pressure and the regulating stage pressure, and add the correction at the total valve position change corresponding to the power change. This method ensures that the primary frequency regulation capability of the unit under deep peak regulation conditions will not reduce the response capability due to the sliding pressure operation mode of the unit.

[0059] like Figure 1 As shown, the present invention provides a method for realizing a frequency regulation under deep peak regulation conditions of a thermal power unit, the method comprising:

[0060] Step 101: Regulating stage pressure p based on real-time operating conditions of the steam turbine e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine;

[0061] Preferably, the regulating stage pressure p under the real-time working condition of the steam turbine is e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow G of the steam turbine, including:

[0062]

[0063] Among them, G0 is the main steam flow rate under rated conditions.

[0064] First, the main steam flow G and the regulating stage pressure p e The main steam flow is calculated in direct proportion to the pressure of the regulating stage and inversely proportional to the main steam pressure. The pressure of the regulating stage is basically proportional to the main steam pressure. The calculation method of the main steam flow of the steam turbine is:

[0065]

[0066] In the formula, p e Adjust the stage pressure according to the real-time working conditions of the steam turbine; e0 T is the regulating stage pressure under rated working condition of steam turbine; e0 T is the regulating stage temperature of the steam turbine under rated operating conditions; e Adjust stage temperatures for real-time turbine operating conditions.

[0067] Step 102: Calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine j ;

[0068] Preferably, the mechanical power N of the steam turbine is calculated based on the main steam flow G of the steam turbine. j ,include:

[0069] N j =3600×G×H j × j

[0070] Among them, H j is the effective enthalpy drop, r j is the internal efficiency of the steam turbine.

[0071] In the present invention, the internal power of the steam turbine is proportional to the steam flow rate G (unit: kg / h) and the effective enthalpy drop H j The product of the steam turbine mechanical power is:

[0072] N j =3600×G×H j × j

[0073] Where Nj is the power inside the steam turbine; r j is the internal efficiency of the steam turbine; G is the main steam flow rate.

[0074] Step 103: Internal power variation ΔN based on real-time changing operating conditions of the steam turbine j , and the corresponding internal power change ΔN0 under rated conditions;

[0075] Preferably, the internal power variation ΔN under the real-time changing working condition of the steam turbine is j , and the corresponding internal power change ΔN0 under rated conditions, including:

[0076] The internal power change ΔN under real-time changing conditions is calculated by the following formula j :

[0077]

[0078] Among them, Δp e is the pressure change of the regulating stage under rated conditions, ΔT e0 is the change in regulating stage temperature under rated conditions, ΔG0 is the change in main steam flow under rated conditions;

[0079] The corresponding internal power change under rated working conditions is calculated by the following formula:

[0080] ΔN0=3600×ΔG0×H0×r0

[0081] Among them, H0 is the main steam enthalpy drop under rated conditions, and r0 is the internal efficiency of the turbine under rated conditions.

[0082] The present invention is based on the one-to-one correspondence between the total valve position change and the frequency change in the feedforward part of the primary frequency modulation function. When the turbine is in different working conditions, due to the difference in main steam pressure and regulating stage pressure, the main steam flow, enthalpy drop and efficiency in the turbine caused by the total valve position change corresponding to the frequency change will change, resulting in a change in the work capacity of the total valve position change corresponding to the frequency change. At this time, the power change in the turbine is:

[0083]

[0084] The corresponding power change in the turbine under rated conditions is:

[0085] ΔN0=3600×ΔG0×H0×r0

[0086] Step 104: Based on the internal power variation ΔN under the real-time changing working condition j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj .

[0087] Preferably, based on the internal power variation ΔN under real-time changing working conditions j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj ,include:

[0088]

[0089] Among them, ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

[0090] The real-time total valve position change correction value in the present invention is:

[0091]

[0092] Where ΔP GVj is the real-time total valve position change of the steam turbine actuator; ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

[0093] The present invention provides a method for realizing the primary frequency regulation under the deep peak regulation condition of a thermal power generating set, which can effectively improve the response capability of the primary frequency regulation under the deep peak regulation condition of the thermal power generating set.

[0094] Figure 3 The present invention is a structural diagram of a system for realizing frequency regulation under deep peak regulation conditions of a thermal power unit according to a preferred embodiment of the present invention.

[0095] like Figure 3 As shown, the present invention provides a system for realizing frequency regulation under deep peak regulation conditions of a thermal power unit, the system comprising:

[0096] The first calculation unit 301 is used to adjust the stage pressure p based on the real-time working condition of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine;

[0097] Preferably, the first calculation unit 301 is used to adjust the stage pressure p based on the real-time working condition of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow G of the steam turbine, and also used for:

[0098]

[0099] Among them, G0 is the main steam flow rate under rated conditions.

[0100] The second calculation unit 302 is used to calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine. j ;

[0101] Preferably, the second calculation unit 302 is used to calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine. j , also used for:

[0102] N j =3600×G×H j × j

[0103] Among them, H j is the effective enthalpy drop, r j is the internal efficiency of the steam turbine.

[0104] The third calculation unit 303 is used to calculate the internal power variation ΔN based on the real-time changing working condition of the steam turbine. j , and the corresponding internal power change ΔN0 under rated conditions;

[0105] Preferably, the third calculation unit 303 is used to calculate the internal power variation ΔN based on the real-time changing working condition of the steam turbine. j , and the corresponding internal power change ΔN0 under rated conditions, are also used for:

[0106] The internal power change ΔN under real-time changing conditions is calculated by the following formula j :

[0107]

[0108] Among them, Δp e is the pressure change of the regulating stage under rated conditions, ΔT e0 is the change in regulating stage temperature under rated conditions, ΔG0 is the change in main steam flow under rated conditions;

[0109] The corresponding internal power change under rated working conditions is calculated by the following formula:

[0110] ΔN0=3600×ΔG0×H0×r0

[0111] Among them, H0 is the main steam enthalpy drop under rated conditions, and r0 is the internal efficiency of the turbine under rated conditions.

[0112] The fourth calculation unit 304 is used to calculate the internal power change ΔN based on the real-time changing working condition.j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj .

[0113] Preferably, the fourth calculation unit 304 is used to calculate the internal power change ΔN based on the real-time changing working condition. j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj , also used for:

[0114]

[0115] Among them, ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

[0116] A system for realizing a frequency regulation under deep peak-shaving conditions of a thermal power unit in a preferred embodiment of the present invention corresponds to a method for realizing a frequency regulation under deep peak-shaving conditions of a thermal power unit in another preferred embodiment of the present invention, and will not be described in detail here.

[0117] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0118] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0122] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0123] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0124] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A method for realizing a frequency regulation under deep peak regulation conditions of a thermal power unit, the method comprising: Based on the regulating stage pressure p under the real-time working condition of the steam turbine e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine; Based on the main steam flow rate G of the steam turbine, calculate the mechanical power N of the steam turbine j ; The internal power variation ΔN based on the real-time changing working conditions of the steam turbine j , and the corresponding internal power change ΔN0 under rated conditions; Based on the internal power change ΔN under real-time changing conditions j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj .

2. The method according to claim 1, wherein the regulating stage pressure p is based on the real-time operating conditions of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow G of the steam turbine, including: Among them, G0 is the main steam flow rate under rated conditions.

3. The method according to claim 2, wherein the mechanical power N of the steam turbine is calculated based on the main steam flow G of the steam turbine. j ,include: N j =3600×G×H j ×r j Among them, H j is the effective enthalpy drop, r j is the internal efficiency of the steam turbine.

4. The method according to claim 3, wherein the internal power variation ΔN under the real-time changing working condition of the steam turbine is j , and the corresponding internal power change ΔN0 under rated conditions, including: The internal power change ΔN under real-time changing conditions is calculated by the following formula j : Among them, Δp e is the pressure change of the regulating stage under rated conditions, ΔT e0 is the change in regulating stage temperature under rated conditions, ΔG0 is the change in main steam flow under rated conditions; The corresponding internal power change under rated working conditions is calculated by the following formula: ΔN0=3600×ΔG0×H0×r0 Among them, H0 is the main steam enthalpy drop under rated conditions, and r0 is the internal efficiency of the turbine under rated conditions.

5. The method according to claim 4, wherein the internal power variation ΔN under real-time changing working conditions j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj ,include: Among them, ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

6. A system for realizing a frequency regulation under deep peak regulation conditions of a thermal power unit, the system comprising: The first calculation unit is used to adjust the stage pressure p based on the real-time working conditions of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow rate G of the steam turbine; The second calculation unit is used to calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine. j ; The third calculation unit is used to calculate the internal power change ΔN based on the real-time changing working conditions of the steam turbine. j , and the corresponding internal power change ΔN0 under rated conditions; The fourth calculation unit is used to calculate the internal power change ΔN based on the real-time changing working conditions. j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj .

7. The system according to claim 6, wherein the first calculation unit is used to adjust the stage pressure p based on the real-time operating conditions of the steam turbine. e , regulating stage pressure p of steam turbine under rated operating conditions e0 , regulating stage temperature T of steam turbine under rated operating conditions e0 , the regulating stage temperature T under the real-time working condition of the steam turbine e , calculate the main steam flow G of the steam turbine, and also used for: in, G0 is the main steam flow rate under rated conditions.

8. The system according to claim 7, wherein the second calculation unit is used to calculate the mechanical power N of the steam turbine based on the main steam flow G of the steam turbine. j , also used for: N j =3600×G×H j ×r j in, H j is the effective enthalpy drop, r j is the internal efficiency of the steam turbine.

9. The system according to claim 8, wherein the third calculation unit is used to calculate the internal power variation ΔN based on the real-time changing working conditions of the steam turbine. j , and the corresponding internal power change ΔN0 under rated conditions, are also used for: The internal power change ΔN under real-time changing conditions is calculated by the following formula j : Among them, Δp e is the pressure change of the regulating stage under rated conditions, ΔT e0 is the change in regulating stage temperature under rated conditions, ΔG0 is the change in main steam flow under rated conditions; The corresponding internal power change under rated working conditions is calculated by the following formula: ΔN0=3600×ΔG0×H0×r0 in, H0 is the main steam enthalpy drop under rated conditions, and r0 is the internal efficiency of the turbine under rated conditions.

10. The system according to claim 9, wherein the fourth calculation unit is used to calculate the internal power variation ΔN based on the real-time changing working condition. j , the internal power change ΔN0 under rated conditions, calculate the correction value ΔP of the total valve position change of the steam turbine under real-time conditions GVj , also used for: in, ΔP GV0 It is the total valve position change of the turbine actuator under rated conditions.

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