A method and system for calculating the feasible region of a generator set under deep peak regulation conditions

Abstract

The application relates to a method and system for calculating the feasible region of a generator set under a deep peak regulation condition, wherein the method comprises the following steps: simulating the deep peak regulation condition of the generator set through current excitation; simulating and calculating the electromagnetic force distribution of a stator end wire bar of the generator set under the deep peak regulation condition of the generator set; simulating and calculating the displacement amplitude of the stator end wire bar based on the electromagnetic force distribution and the structural mechanics physical field of the stator end wire bar; and obtaining the feasible region of the generator set based on the displacement amplitude of the stator end wire bar. Through the application, the change trend of the electromagnetic force and the vibration amplitude of the stator end wire bar of the generator set under the deep peak regulation condition is simulated and calculated, the deep regulation range for safe and stable operation of the generator set is given, the occurrence of faults such as stator wire bar slot wedge loosening and insulation material shell peeling is reduced, and the problem of how to reduce the failure rate of the generator set under the deep peak regulation condition is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generators, in particular to a method and system for calculating a feasible region of a generator set under a deep peak shaving operating condition. BACKGROUND

[0002] With the gradual increase of renewable energy in the energy system, the output of clean energy generation such as wind power and solar power has the characteristics of randomness, volatility and intermittency. Large-scale grid connection brings great impact on the power system, causing coal-fired, steam turbine and other generating units to constantly change their operating states to cooperate with the operation of clean energy generation, such as frequent peak shaving, frequency modulation, load change and load reduction.

[0003] Deep peak shaving capability is an index to measure the flexibility of generating units. Deep peak shaving operating condition is different from long-term basic load operation condition of generating units. During deep peak shaving operation, generating units are prone to a series of failures such as accelerated loosening and accelerated wear of parts.

[0004] At present, there is no effective solution to the problem of how to reduce the failure rate of generating units under deep peak shaving operating condition in the related art. SUMMARY

[0005] The embodiments of the present application provide a method and system for calculating a feasible region of a generating unit under a deep peak shaving operating condition to at least solve the problem of how to reduce the failure rate of generating units under deep peak shaving operating condition in the related art.

[0006] In a first aspect, the embodiments of the present application provide a method for calculating a feasible region of a generating unit under a deep peak shaving operating condition, the method comprising:

[0007] simulating a deep peak shaving operating condition of a generating unit by current excitation;

[0008] simulating and calculating electromagnetic force distribution of a stator end wire rod in the generating unit under the deep peak shaving operating condition of the generating unit;

[0009] simulating and calculating displacement amplitude of the stator end wire rod based on the electromagnetic force distribution and structural mechanics physical field of the stator end wire rod;

[0010] obtaining a feasible region of the generating unit based on the displacement amplitude of the stator end wire rod.

[0011] In some embodiments, simulating a deep peak shaving operating condition of a generating unit by current excitation comprises:

[0012] The deep peak shaving operating condition of the generating unit includes a rated operating condition, a rapid load change operating condition and an overload operating condition;

[0013] simulating rated operation condition of the generator set by three-phase current excitation;

[0014] simulating fast variable load condition of the generator set by three-phase current excitation;

[0015] simulating overload operation condition of the generator set by three-phase current excitation.

[0016] In some embodiments, simulating rated operation condition of the generator set by three-phase current excitation comprises:

[0017] simulating rated operation condition of the generator set by three-phase current excitation, an expression of the three-phase current excitation is:

[0018]

[0019] wherein, I m represents maximum value of current, ω represents angular frequency, and t represents time.

[0020] In some embodiments, simulating fast variable load condition of the generator set by three-phase current excitation comprises:

[0021] simulating fast variable load condition of the generator set by three-phase current excitation, an expression of the three-phase current excitation is:

[0022]

[0023] wherein, I m represents maximum value of current, ω represents angular frequency, t represents time, and a represents speed variation of the generator set as a% per minute.

[0024] In some embodiments, simulating overload operation condition of the generator set by three-phase current excitation comprises:

[0025] simulating overload operation condition of the generator set by three-phase current excitation, an expression of the three-phase current excitation is:

[0026]

[0027] wherein, I m represents maximum value of current, ω represents angular frequency, t represents time, and b represents operation load of the generator set as b%.

[0028] In some embodiments, under deep peak shaving condition of the generator set, simulating electromagnetic force distribution of stator end wire bars in the generator set comprises:

[0029] constructing three-dimensional model of stator end winding in the generator set, wherein the stator end winding comprises stator end wire bars;

[0030] In the deep peak regulation condition of the generator set, the three-dimensional model of the stator end winding is divided by finite element, and the electromagnetic force distribution of the stator end bar is simulated and calculated.

[0031] In some embodiments, the simulation and calculation of the electromagnetic force distribution of the stator end bar includes:

[0032] The electromagnetic force distribution of the stator end bar is simulated and calculated by the formula The electromagnetic field of the stator end bar is simulated, and the electromagnetic force distribution of the stator end bar is calculated, wherein E represents the electric field intensity, A represents the in-slot vector magnetic potential, t represents time, represents the in-slot scalar magnetic potential, and represents the Nabla operator, represents the partial derivative.

[0033] In some embodiments, based on the electromagnetic force distribution of the stator end bar and the structural mechanics physical field, the simulation and calculation of the displacement amplitude of the stator end bar includes:

[0034] The stator end bar is split to obtain a slot opening, an involute segment, a nose straight line segment and a nose end;

[0035] The electromagnetic force distribution of the stator end bar is mapped to the nose straight line segment and the slot opening, and the displacement amplitude of the stator end bar is simulated and calculated in combination with the structural mechanics physical field.

[0036] In some embodiments, based on the displacement amplitude of the stator end bar, the feasible region of the generator set is obtained, including:

[0037] Based on the displacement amplitude of the stator end bar, the feasible region of the large steam turbine generator in the deep peak regulation condition is obtained by comparing the displacement amplitude with the standard displacement amplitude requirement.

[0038] In a second aspect, the embodiments of the present application provide a calculation system of a feasible region of a generator set in a deep peak regulation condition, the system is used to execute the method in any one of the above-mentioned first aspect, and the system includes a working condition simulation module, a simulation calculation module and a feasible region calculation module.

[0039] The working condition simulation module is used to simulate the deep peak regulation condition of the generator set by current excitation.

[0040] The simulation calculation module is used to simulate and calculate the electromagnetic force distribution of the stator end bar in the deep peak regulation condition of the generator set; based on the electromagnetic force distribution of the stator end bar and the structural mechanics physical field, the displacement amplitude of the stator end bar is simulated and calculated.

[0041] The feasible region calculation module is configured to obtain the feasible region of the generator set according to the displacement amplitude of the stator end wire bar.

[0042] Compared with the related art, the method and system for calculating the feasible region of a generator set in a deep peak regulation condition provided by the embodiments of the application have the following advantages. The method simulates the deep peak regulation condition of the generator set by current excitation. The electromagnetic force distribution of the stator end wire bar of the generator set is simulated and calculated in the deep peak regulation condition of the generator set. The displacement amplitude of the stator end wire bar is simulated and calculated based on the electromagnetic force distribution of the stator end wire bar and the structural mechanics physical field. The feasible region of the generator set is obtained based on the displacement amplitude of the stator end wire bar. The variation trend of the electromagnetic force and the vibration amplitude of the stator end wire bar of the generator set in the deep peak regulation condition is simulated and calculated. The deep regulation range for safe and stable operation of the generator set is given, so as to reduce the occurrence of faults such as loosening of the stator wire bar slot wedge and peeling of the insulation material, and solve the problem of how to reduce the failure rate of the generator set in the deep peak regulation condition. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate certain illustrative embodiments of the application and together with the description serve to explain the application. In the drawings:

[0044] Figure 1 FIG. 1 is a step flow chart of the method for calculating the feasible region of a generator set in a deep peak regulation condition according to an embodiment of the application;

[0045] Figure 2 FIG. 2 is a schematic diagram of three-phase current excitation according to an embodiment of the application;

[0046] Figure 3 FIG. 3 is a schematic diagram of a three-dimensional model of a stator end winding according to an embodiment of the application;

[0047] Figure 4 FIG. 4 is a schematic diagram of finite element division of a three-dimensional model of a stator end winding according to an embodiment of the application;

[0048] Figure 5 FIG. 5 is a schematic diagram of four-part division of a stator end wire bar according to an embodiment of the application;

[0049] Figure 6 FIG. 6 is a schematic diagram of electromagnetic force distribution mapping of a stator end wire bar according to an embodiment of the application;

[0050] Figure 7 FIG. 7 is a structural block diagram of a system for calculating the feasible region of a generator set in a deep peak regulation condition according to an embodiment of the application;

[0051] Figure 8FIG. 1 is a schematic diagram of an internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort fall within the scope of the present application.

[0053] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can be applied to other similar scenarios without creative effort based on the accompanying drawings. In addition, it can be understood that although the efforts made in the development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means and should not be understood as insufficient disclosure of the content disclosed in the present application.

[0054] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0055] Unless otherwise defined, technical terms and scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a", "an", "one", "this", and similar referents in the context of describing the application are to be construed to be inclusive of both the singular and the plural, unless otherwise indicated. The terms "comprising", "comprises" and "comprised of" as well as "containing", "containing" and "containing" are inclusive and do not exclude other steps, elements or ingredients. The terms "connected", "coupled", "linked", and the like, as well as "connected", "coupled", "linked" and the like, are not limited to physical or mechanical connections or couplings, but can include electrical connections, whether direct or indirect. The term "multiple" refers to two or more. The term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects. The terms "first", "second", "third" and the like only distinguish similar objects, and do not represent a specific order of the objects.

[0056] The embodiment of the present application provides a method for calculating the feasible region of a generator set under a deep peak regulation condition, Figure 1 is a step flow chart of the method for calculating the feasible region of the generator set under the deep peak regulation condition provided by the embodiment of the present application, as shown in Figure 1 The method comprises the following steps:

[0057] Step S102, simulating the deep peak regulation condition of the generator set by current excitation, wherein the deep peak regulation condition of the generator set comprises a rated operation condition, a rapid variable load condition and an overload operation condition;

[0058] Step S102 specifically comprises the following steps:

[0059] Step S1021, Figure 2 is a schematic diagram of three-phase current excitation provided by the embodiment of the present application, as shown in Figure 2 The stator end winding is composed of two layers of wire rods, the winding is divided into three phases, there are six outgoing ports, and the rated operation condition of the generator set is simulated by three-phase current excitation;

[0060] Step S1021 specifically, the rated operation condition of the generator set is simulated by three-phase current excitation, and the expression of three-phase current excitation is:

[0061]

[0062] wherein I m represents the maximum value of the current, ω represents the angular frequency, and t represents time.

[0063] Step S1022, as shown in the figure, the stator end winding is composed of two layers of wire rods, the winding is divided into 3 phases, a total of 6 outgoing ports, through the three-phase current excitation simulation generator set of fast variable load condition; Figure 2

[0064] Step S1022 specifically, through the three-phase current excitation simulation generator set of fast variable load condition, the expression of three-phase current excitation is:

[0065]

[0066] wherein I m represents the maximum value of the current, ω represents the angular frequency, t represents time, and a represents the rate of change of the generator set a% / min.

[0067] Step S1023, as shown in the figure, the stator end winding is composed of two layers of wire rods, the winding is divided into 3 phases, a total of 6 outgoing ports, through the three-phase current excitation simulation generator set of overload operation condition. Figure 2

[0068] Step S1023 specifically, through the three-phase current excitation simulation generator set of overload operation condition, the expression of three-phase current excitation is:

[0069]

[0070] wherein I m represents the maximum value of the current, ω represents the angular frequency, t represents time, and b represents the operating load of the generator set b%.

[0071] It should be noted that the stator end winding of the large steam turbine generator will vibrate under the action of electromagnetic force during long-term operation, and this vibration is usually within the range that the material can withstand. The deep peak shaving operation condition is different from the long-term basic load operation condition of the unit. When the generator is operated in the deep peak shaving condition such as frequent variable load and ultra-low load, the stator wire rod slot wedge loosening degree increases, the vibration intensifies, and the insulation material peels off, etc. The step S102 simulates three deep peak shaving conditions of the generator set, which can restore the actual deep peak shaving scene of the generator set more comprehensively, provide comprehensive and reliable data for subsequent feasible domain calculation of the generator set, and greatly improve the reliability of the deep adjustment range of the safe and stable operation of the generator set.

[0072] Step S104, under the deep peak shaving condition of the generator set, the electromagnetic force distribution of the stator end wire rod in the generator set is simulated and calculated;​​

[0073] Step S104 specifically includes the following steps:

[0074] Step S1041, Figure 3 is a schematic diagram of a stator end winding three-dimensional model provided according to an embodiment of the present application, as Figure 3 shown, a three-dimensional model of the stator end winding in the generator set is constructed, wherein the stator end winding includes a stator end bar, a stator core, and a rotor, and the stator coil is a structure formed by connecting the stator end bar outside the stator core;

[0075] It should be noted that the stator end winding three-dimensional model of the present embodiment is completely built according to the real structure, wherein, since the stator end compression ring and the compression finger have weak influence on the end leakage magnetic field, the compression ring and the compression finger structure are ignored here to reduce the calculation amount.

[0076] Step S1042, Figure 4 is a schematic diagram of finite element division of the stator end winding three-dimensional model provided according to an embodiment of the present application, as Figure 4 shown, since the electromagnetic force distribution of the stator end bar is analyzed, the stator end bar is divided by a finer grid, the three-dimensional model of the stator end winding is divided by finite elements under the deep peak regulation condition of the generator set, and the electromagnetic force distribution of the stator end bar is simulated and calculated.

[0077] Step S1042 specifically, the electromagnetic field of the stator end bar is simulated by the formula to calculate the electromagnetic force distribution of the stator end bar, wherein E represents the electric field intensity, A represents the slot vector magnetic potential, t represents time, represents the slot scalar magnetic potential, and represents the Nabla operator, represents the partial derivative.

[0078] It should be noted that the stator end bar is one of the basic elements of the stator winding. The stator end bar refers to the bar part of the stator winding of the generator, which is usually made of conductive material (such as copper) to carry current and generate a magnetic field. The bar is made into a specific shape according to the design requirements of the generator and is isolated by insulating material to prevent short circuit. At the end of the generator, the bar extends out of the core, which is called the end bar. The stator end winding refers to the overall structure including the coil inside the stator and the bar extending to both ends of the stator core, and the end winding includes the end bar and the connection part therebetween, which together form a complete electromagnetic circuit to generate the required magnetic field when energized.

[0079] Step S106, based on the electromagnetic force distribution of the stator end bar and the structural mechanics physical field, the displacement amplitude of the stator end bar is simulated and calculated;

[0080] Step S106 specifically includes the following steps:

[0081] Step S1061, Figure 5 is a schematic diagram of four-part division of the stator end wire bar provided according to an embodiment of the present application, as Figure 5 shown, the stator end wire bar structure is different, and the electromagnetic force and displacement characteristics that need to be concerned are also different, so the stator end wire bar is split to obtain the slot opening, the involute segment, the nose straight line segment and the nose;

[0082] Step S1062, Figure 6 is a schematic diagram of electromagnetic force distribution mapping of the stator end wire bar provided according to an embodiment of the present application, as Figure 6 shown, the electromagnetic force distribution of the stator end wire bar is mapped to the nose straight line segment and the slot opening, and the displacement amplitude of the stator end wire bar is simulated and calculated in combination with the structural mechanics physical field.

[0083] Step S108, based on the displacement amplitude of the stator end wire bar, the feasible region of the generator set is obtained.

[0084] Step S108 specifically, based on the displacement amplitude of the stator end wire bar, by comparing the displacement amplitude with the standard displacement amplitude requirement (such as the national standard requirement), the feasible region of the large steam turbine generator under the deep peak regulation condition is obtained.

[0085] Through steps S102 to S108 in the embodiment of the present application, the change trend of the electromagnetic force and the vibration amplitude of the generator set stator end wire bar under the deep peak regulation condition is simulated and calculated, the deep regulation range for safe and stable operation of the generator set is given, to reduce the occurrence of faults such as loosening of the stator wire bar slot wedge and peeling of the insulation material, and the problem of how to reduce the failure rate of the generator set under the deep peak regulation condition is solved.

[0086] It should be noted that the steps shown in the above flow or the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0087] The embodiment of the present application provides a calculation system for the feasible region of a generator set under a deep peak regulation condition, Figure 7 is a structural block diagram of the calculation system for the feasible region of the generator set under the deep peak regulation condition provided according to an embodiment of the present application, as Figure 7 shown, the system includes a working condition simulation module, a simulation calculation module and a feasible region calculation module;

[0088] The working condition simulation module is used to simulate the deep peak regulation condition of the generator set by current excitation;

[0089] a simulation calculation module, configured to simulate and calculate electromagnetic force distribution of a stator end wire bar in the generator set under a deep peak regulation working condition of the generator set, and simulate and calculate displacement amplitude of the stator end wire bar based on the electromagnetic force distribution of the stator end wire bar and a structural mechanics physical field;

[0090] a feasible region calculation module, configured to obtain a feasible region of the generator set according to the displacement amplitude of the stator end wire bar.

[0091] Through the working condition simulation module, the simulation calculation module and the feasible region calculation module in the embodiment, the change trend of electromagnetic force and vibration amplitude of the stator end wire bar of the generator set under the deep peak regulation working condition is simulated and calculated, and the deep regulation range for safe and stable operation of the generator set is given, so as to reduce the occurrence of faults such as stator wire bar slot wedge loosening and insulation material shell-off, and the problem of how to reduce the failure rate of the generator set under the deep peak regulation working condition is solved.

[0092] It should be noted that each of the above modules can be a functional module or a program module, and can be implemented by software or hardware. For the modules implemented by hardware, each of the above modules can be located in the same processor; or each of the above modules can also be located in different processors in any combination.

[0093] The embodiment also provides an electronic device including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the computer program to perform the steps in any of the method embodiments.

[0094] Optionally, the electronic device can further include a transmission device and an input / output device, wherein the transmission device is connected with the processor, and the input / output device is connected with the processor.

[0095] It should be noted that the specific examples in the embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the embodiment will not be described here.

[0096] In addition, in combination with the method for calculating the feasible region of the generator set under the deep peak regulation working condition in the above embodiment, the embodiment can provide a storage medium for implementation. The storage medium stores a computer program; when the computer program is executed by a processor, any of the methods for calculating the feasible region of the generator set under the deep peak regulation working condition in the above embodiments is implemented.

[0097] In one embodiment, a computer device is provided, which can be a terminal. The computer device comprises a processor, a memory, a network interface, a display screen and an input device connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer program, when executed by the processor, implements a method for calculating a feasible region of a generator set in a deep peak regulation mode. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0098] In one embodiment, Figure 8 is a schematic diagram of the internal structure of an electronic device according to an embodiment of the present application, as Figure 8 shown, an electronic device is provided, which can be a server, and the internal structure diagram thereof can be as Figure 8 shown. The electronic device comprises a processor, a network interface, an internal memory and a non-volatile memory connected through an internal bus, wherein the non-volatile memory stores an operating system, a computer program and a database. The processor is configured to provide computing and control capabilities, the network interface is configured to communicate with an external terminal through a network connection, the internal memory is configured to provide an environment for running the operating system and the computer program, the computer program, when executed by the processor, implements a method for calculating a feasible region of a generator set in a deep peak regulation mode, and the database is configured to store data.

[0099] Those skilled in the art can understand that Figure 8 the structure shown in the above embodiment is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. Specifically, the electronic device can comprise more or fewer components than those shown in the diagram, or some components can be combined, or have a different arrangement of components.

[0100] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, databases, or other media in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0101] Those skilled in the art should understand that any combination of the technical features of the above-mentioned embodiments can be combined, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0102] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for calculating the feasible region of a generator set under deep peak regulation conditions, characterized in that, The method comprises: The deep peak regulation working condition of the generator set comprises a rated operation working condition, a quick load change working condition and an overload operation working condition; The rated operation working condition of the generator set is simulated by three-phase current excitation; The quick load change working condition of the generator set is simulated by three-phase current excitation, and the expression of the three-phase current excitation is: wherein I m denotes the maximum value of the current, ω denotes the angular frequency, t denotes the time, a denotes the rate of change of the generator set as a % / min; The overload operation working condition of the generator set is simulated by three-phase current excitation; The electromagnetic force distribution of the stator end wire bar in the generator set is simulated and calculated under the deep peak regulation working condition of the generator set; The displacement amplitude of the stator end wire bar is simulated and calculated based on the electromagnetic force distribution and the structural mechanics physical field of the stator end wire bar; The feasible region of the generator set is obtained based on the displacement amplitude of the stator end wire bar.

2. The method of claim 1, wherein, The rated operation working condition of the generator set is simulated by three-phase current excitation, and the expression of the three-phase current excitation is: The quick load change working condition of the generator set is simulated by three-phase current excitation, and the expression of the three-phase current excitation is: wherein I m denotes the maximum value of the current, ω denotes the angular frequency, t denotes the time.

3. The method of claim 1, wherein, The overload operation working condition of the generator set is simulated by three-phase current excitation, and the expression of the three-phase current excitation is: ω wherein, I m denotes the maximum value of the current, The electromagnetic force distribution of the stator end wire bar in the generator set is simulated and calculated under the deep peak regulation working condition of the generator set, which comprises: denotes the angular frequency, t denotes the time, b represents the operating load of the generator set as b %.

4. The method of claim 1, wherein, A three-dimensional model of the stator end winding in the generator set is constructed, wherein the stator end winding comprises a stator end wire bar; The three-dimensional model of the stator end winding is divided by finite elements to simulate and calculate the electromagnetic force distribution of the stator end wire bar under the deep peak regulation working condition of the generator set. The electromagnetic force distribution of the stator end wire bar is simulated and calculated, which comprises:

5. The method of claim 4, wherein, φ By the formula The electromagnetic field of the stator end bar is simulated, and the electromagnetic force distribution of the stator end bar is calculated, wherein, E represents the electric field intensity, A represents the slot vector magnetic potential, t represents time, The displacement amplitude of the stator end wire bar is simulated and calculated based on the electromagnetic force distribution and the structural mechanics physical field of the stator end wire bar, which comprises: represents the slot scalar magnetic potential, and represents the Nabla operator, and represents the partial derivative.

6. The method of claim 1, wherein, The stator end wire bar is split to obtain a slot opening, an involute segment, a nose straight line segment and a nose; The electromagnetic force distribution of the stator end wire bar is mapped to the nose straight line segment and the slot opening, and the displacement amplitude of the stator end wire bar is simulated and calculated in combination with the structural mechanics physical field. The feasible region of the generator set is obtained based on the displacement amplitude of the stator end wire bar, which comprises:

7. The method of claim 1, wherein, The feasible region of the large-sized steam turbine generator under the deep peak regulation working condition is obtained based on the displacement amplitude of the stator end wire bar by comparing the displacement amplitude with a standard displacement amplitude requirement. The system is used to execute the method in any one of claims 1 to 7, and comprises a working condition simulation module, a simulation calculation module and a feasible region calculation module; 8.A system for calculating the feasible region of a generator set under deep peak shaving operation, characterized in that, The working condition simulation module is used to simulate the deep peak regulation working condition of the generator set by current excitation; The simulation calculation module is used to simulate and calculate the electromagnetic force distribution of the stator end wire bar in the generator set under the deep peak regulation working condition of the generator set, and simulate and calculate the displacement amplitude of the stator end wire bar based on the electromagnetic force distribution and the structural mechanics physical field of the stator end wire bar; The feasible region calculation module is used to obtain the feasible region of the generator set according to the displacement amplitude of the stator end wire bar. ​

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