A method and system for dynamic balancing of a steam turbine generator set

Abstract

This invention relates to a dynamic balancing method and system for steam turbine generator sets, specifically comprising: establishing a three-dimensional rotor model; acquiring real-time vibration parameter information of the generator rotor; acquiring the current operating condition of the generator set; determining whether there is an imbalance problem in the generator set based on the real-time vibration parameter information and the preset balancing conditions under each operating condition; and, if an imbalance problem exists, performing the following steps: selecting a weighting plane for dynamic balancing and acquiring the influence coefficient of the weighting plane; calculating the weighting position and weight of the balancing blocks based on the real-time vibration parameter information, the selection of the weighting plane, and the influence coefficient; adding balancing blocks of the corresponding mass; if there is no imbalance problem in the generator set, ending the dynamic balancing process; otherwise, recording the vibration parameter information of the rotor after weighting, removing the added balancing blocks, and re-performing the dynamic balancing. Compared with existing technologies, this invention models the generator set and streamlines the dynamic balancing process, making the dynamic balancing problem intuitive and easy to operate.

Description

Technical Field

[0001] This invention relates to the field of vibration technology for steam turbine generator sets, and in particular to a dynamic balancing method and system for steam turbine generator sets. Background Technology

[0002] Due to the diversification and differentiation of steam turbine generator sets, and the increasing size and higher parameters of the units, the shaft system structure of the units is becoming increasingly complex. This leads to a rise in vibration faults in steam turbine generator sets, with more complex and broader implications, including factors related to operation, maintenance, and manufacturing. Large steam turbine generator sets, especially supercritical and ultra-supercritical units, experience greater thermal stress, thermal deformation, and thermal expansion within the metal components during start-up, shutdown, and changes in operating conditions. This increases the factors that can cause sudden vibration changes, and the various factors interact and couple with each other, making the vibration mechanism and phenomena even more complex.

[0003] Imbalance is the most common vibration problem in steam turbines, causing 80% of vibration issues, and many other vibration problems also stem from imbalance faults. The main method for resolving imbalance problems is on-site dynamic balancing, and the primary calculation method for on-site dynamic balancing is the influence coefficient method, which determines the location and order of imbalance. However, due to the complexity of the calculation process, improper application is common, leading to many units failing to resolve abnormal vibrations even after balancing dozens of times. Therefore, reducing vibration values ​​to the expected level with the fewest startups has become the optimal goal for handling imbalance problems. Furthermore, diagnosing vibration faults in rotating machinery requires a high level of expertise. When a vibration fault occurs, failure to analyze and address the problem promptly may result in delayed grid connection, grid dispatch assessments, and potentially larger safety accidents and economic losses, causing significant financial damage to the power plant.

[0004] Therefore, a solution is needed to address the common imbalance faults in steam turbines, which can help power plant staff quickly perform dynamic balancing on the units. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art by providing a dynamic balancing method and system for steam turbine generator sets.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A dynamic balancing method for steam turbine generator sets, specifically:

[0008] Establish a three-dimensional model of the rotor and determine the influence coefficients of each weighting plane; obtain real-time vibration parameters of the unit rotor; obtain the current operating conditions of the unit, which are divided into overcritical, rated speed, and load conditions; based on the real-time vibration parameters and the preset balance conditions under each operating condition, determine whether there is an imbalance problem in the unit; if there is an imbalance problem in the unit, perform the following steps:

[0009] S1. Determine the bearing location where the vibration caused by the imbalance is located, select the weighting plane for dynamic balancing based on the bearing location where the vibration caused by the imbalance is located, and obtain the influence coefficient of the weighting plane;

[0010] S2. Calculate the weighting position and weight of the balance block based on real-time vibration parameter information, the selection of the weighting plane, and the influence coefficient;

[0011] S3. Mark the balance blocks on the rotor 3D model, and add the corresponding mass balance blocks at the corresponding positions on the rotor according to the markings on the rotor 3D model;

[0012] S4. Restart the unit. If there is no imbalance problem, end the dynamic balancing. Otherwise, record the vibration parameters of the rotor after weighting, remove the added balance block. If it is necessary to reselect the weighting plane, execute step S1. Otherwise, use the vibration parameters of the rotor before and after weighting to calculate the influence coefficient, update the influence coefficient of the weighting plane, and execute step S2.

[0013] Furthermore, establishing the rotor's three-dimensional model includes:

[0014] Obtain the original modeling parameters of the rotor, including the design drawings, key phase positions, and balance hole positions; establish an initial three-dimensional rotor model based on the original modeling parameters; obtain the key phase and initial balance block information of the rotor, including the key phase position, the weight information of the initial balance block, the weighting plane where the initial balance block is located, and the angle of the initial balance block relative to the key phase position; mark the key phase and initial balance block information on the initial three-dimensional rotor model.

[0015] Furthermore, the equilibrium condition for the unbalanced problem under overcritical conditions is:

[0016] Based on real-time vibration parameter information, the vibration of the unit at critical speed is obtained, the proportion of the first harmonic component is obtained, and the vibration phase of the unit at the current time and the historical vibration phase of the unit at startup are obtained. If the vibration at critical speed is greater than or equal to the first vibration threshold, and the proportion of the first harmonic component exceeds the first proportion threshold, and the difference between the vibration phase of the current time and the historical vibration phase at startup is less than the first stability threshold, then the unit has an imbalance problem.

[0017] Furthermore, the equilibrium condition for the imbalance problem under rated speed operating conditions is:

[0018] Based on real-time vibration parameter information, the vibration of the unit reaching rated speed is obtained, the proportion of the first harmonic component is obtained, and the vibration phase of the unit in this instance and the historical vibration phase of the unit at startup are obtained. If the vibration of the unit reaching rated speed is greater than or equal to the second vibration threshold, and the proportion of the first harmonic component exceeds the second proportion threshold, and the difference between the vibration phase of the current instance and the historical vibration phase at startup is less than the second stability threshold, then the unit has an imbalance problem.

[0019] Furthermore, the equilibrium condition for the unbalanced problem under load is:

[0020] Based on real-time vibration parameter information, the vibration of the unit reaching rated speed is obtained, the vibration of the unit under load is obtained, the proportion of the first harmonic component is obtained, and the vibration phase of the unit in this instance and the historical vibration phase of the unit at startup are obtained. If the vibration change between the vibration of the unit reaching rated speed and the vibration of the unit under load is greater than or equal to the third vibration threshold, and the proportion of the first harmonic component exceeds the third proportion threshold, and the difference between the vibration phase of the current instance and the historical vibration phase at startup is less than the first stability threshold, then the unit has an imbalance problem.

[0021] Furthermore, in step S2, if the calculated weighting position of the balance block conflicts with the initial balance block position of the unit, the balance block is decomposed by vector to a new balance hole position to obtain a new weighting position and weight.

[0022] Furthermore, in step S1, determining whether the unit has an imbalance problem specifically involves:

[0023] The real-time vibration parameter information of each measuring point on the rotor is obtained, and the real-time vibration parameter information of each measuring point is compared with the preset balance conditions under each operating condition. If there are measuring points whose real-time vibration parameters do not meet the balance conditions, the unit has an imbalance problem. The bearing position where the vibration caused by the imbalance is located is determined according to the installation position of the measuring points.

[0024] Furthermore, step S4 also includes: if there is no imbalance problem in the unit, a balance report is generated, which records the vibration parameter information before and after balancing, as well as the weighting position and weight of the balance block.

[0025] Furthermore, in step S1, the influence coefficient of the weighting plane is a preset value or the influence coefficient value updated in the last dynamic balance.

[0026] A dynamic balancing system for a steam turbine generator set, based on the aforementioned dynamic balancing method for steam turbine generator sets, includes:

[0027] The model building module is used to build a three-dimensional model of the rotor and determine each weighting plane and its influence coefficient.

[0028] The parameter acquisition module is used to acquire real-time vibration parameter information of the unit rotor;

[0029] The operating condition acquisition module is used to acquire the current operating condition of the unit, which is divided into over-critical, rated speed and load conditions.

[0030] The imbalance judgment module is used to determine whether the unit has an imbalance problem based on real-time vibration parameter information and preset balance conditions under various operating conditions.

[0031] The dynamic balancing module is used to perform the following steps when there is an imbalance problem in the unit:

[0032] S1. Determine the bearing location where the vibration caused by the imbalance is located, select the weighting plane for dynamic balancing based on the bearing location where the vibration caused by the imbalance is located, and obtain the influence coefficient of the weighting plane;

[0033] S2. Calculate the weighting position and weight of the balance block based on real-time vibration parameter information, the selection of the weighting plane, and the influence coefficient;

[0034] S3. Mark the balance blocks on the rotor 3D model, and add the corresponding mass balance blocks at the corresponding positions on the rotor according to the markings on the rotor 3D model;

[0035] S4. Restart the unit. If there is no imbalance problem, end the dynamic balancing. Otherwise, record the vibration parameters of the rotor after weighting, remove the added balance block. If it is necessary to reselect the weighting plane, execute step S1. Otherwise, use the vibration parameters of the rotor before and after weighting to calculate the influence coefficient, update the influence coefficient of the weighting plane, and execute step S2.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) This application provides a three-dimensional visual dynamic balancing method for steam turbine generator sets. A three-dimensional visual model of the rotor is generated based on the unit's structural parameters. The model is marked with information about the key phase and the currently added balancing blocks. It can determine whether an imbalance problem exists based on the unit's vibration parameters and provides a complete operating procedure to guide power plant personnel in performing dynamic balancing. The method does not require extensive vibration expertise from staff and is simple to operate. The added balancing blocks can be displayed on the rotor's three-dimensional model, guiding staff in setting the balancing blocks on-site. This method models the unit and streamlines the dynamic balancing process, making the problem intuitive and the operation simple.

[0038] (2) This application can also automatically generate and save dynamic balancing technical reports, update and save the weighting influence coefficients of each rotor, and facilitate the supervision and management of vibration technology of steam turbine generator sets.

[0039] (3) In the dynamic balancing process, this application provides single-plane and double-plane weighting options. Different weighting influence coefficients are set for each plane of different rotors. The staff can choose according to the actual situation to achieve the best dynamic balancing effect. Attached Figure Description

[0040] Figure 1 This is a flowchart of the present invention;

[0041] Figure 2 This is a schematic diagram of the rotor's three-dimensional model;

[0042] Figure 3 This provides a list of vibration parameter information and a display diagram showing the difference calculation for each working condition. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, providing detailed implementation methods and specific operating procedures. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them, and the scope of protection of the present invention is not limited to the following embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] As used herein, "an embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. In the description of the invention, it should be understood that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0045] This specification provides method operation steps as shown in the embodiments or flowcharts, but based on conventional or non-inventive labor, more or fewer operation steps may be included. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only execution order. In actual system or server products, the method can be executed in the order shown in the embodiments or drawings, or in parallel (e.g., in a parallel processor or multi-threaded processing environment), or the execution order of steps without timing constraints can be adjusted.

[0046] Example 1:

[0047] A dynamic balancing method for steam turbine generator sets, such as Figure 1 As shown, specifically:

[0048] A three-dimensional model of the rotor was established, and the influence coefficients of each weighting plane and the rotor three-dimensional model were determined. Figure 2 As shown;

[0049] 1) Obtain the original modeling parameters, such as the structural dimensions of the rotor in the steam turbine generator set. Modeling parameters include: design drawings, key phase locations, and locations of balance holes or balance slots;

[0050] 2) Using 3ds Max as the modeling software and Unity3D as the 3D engine, a 3D model of the rotor was created based on the original modeling parameters.

[0051] 3) Obtain information about the rotor key phase and the initial balancing block, including the position of the key phase, the weight information of the initial balancing block, the weighting plane it is located on, and the angle relative to the position of the key phase;

[0052] 4) Mark the key phase and the corresponding information of the initial balance block on the three-dimensional model of the rotor;

[0053] Obtain real-time vibration parameter information of the unit rotor;

[0054] 5) It can be connected to the power plant's TSI (Turbine Supervisory Instrumentation) system to obtain vibration parameters such as shaft vibration, bearing vibration, phase, and vibration magnitude at each bearing of the unit in real time;

[0055] The current operating condition of the unit is obtained, which is divided into overcritical, rated speed, and load conditions.

[0056] 6) It can acquire parameters such as the unit's operating speed and load, and classify the unit's current operating conditions into over-critical, rated speed, and load conditions. There is a separate operating condition database for each operating condition, and the acquired vibration parameter information is automatically recorded into each operating condition database. The data in the operating condition database can be processed and analyzed by the staff. The staff can freely select different operating condition data and perform vector calculations.

[0057] Based on real-time vibration parameter information and preset balance conditions under various operating conditions, determine whether the unit has an imbalance problem;

[0058] 7) Based on the vibration data under various operating conditions, determine whether the rotor has an imbalance problem:

[0059] a) Overcritical operating condition:

[0060] The vibration of the unit at critical speed is obtained from the TSI. The real-time vibration parameter information is analyzed to obtain the proportion of the first harmonic component. The historical start-up vibration phase is obtained from the operating condition database. If the vibration at critical speed is greater than or equal to the first vibration threshold (160μm in this embodiment), and the proportion of the first harmonic component exceeds the first proportion threshold (70% in this embodiment), and the vibration phase of each start-up is stable (i.e., the difference between the current vibration phase and the historical start-up vibration phase is less than the first stability threshold, and the stability of the vibration phase can be judged manually by calculating the difference and setting the first stability threshold based on experience), then the rotor has an imbalance problem.

[0061] b) Rated speed operating condition

[0062] The vibration data obtained from the TSI (Transmission System) when the unit reaches its rated speed (i.e., vibration when the rotor approaches or just reaches its rated speed) is analyzed to obtain the proportion of the first harmonic component. The historical startup vibration phase is obtained from the operating condition database. If the vibration when approaching or just reaching its rated speed is greater than or equal to the second vibration threshold (100 μm in this embodiment), and the proportion of the first harmonic component exceeds the second proportion threshold (70% in this embodiment), and the vibration phase is stable (i.e., the difference between the current vibration phase and the historical startup vibration phase is less than the second stability threshold; the stability of the vibration phase can be judged manually by calculating the difference and setting the second stability threshold based on experience), then the rotor has an imbalance problem.

[0063] c) Load conditions

[0064] The vibration at rated speed and under load of the unit are acquired by TSI. The real-time vibration parameter information is analyzed to obtain the proportion of the first harmonic component. The historical start-up vibration phase is obtained from the operating condition database. Generally, the vibration is small when the unit is running at constant speed, but the vibration will change after the unit is running under load. Therefore, after vector calculation, if the change in vibration between the unit reaching rated speed and the unit under load is greater than or equal to the third vibration threshold (50 μm in this embodiment), and the proportion of the first harmonic component exceeds the third proportion threshold (70% in this embodiment), and the vibration phase remains stable when the load is stable (that is, the difference between the current vibration phase and the historical start-up vibration phase is less than the second stability threshold, and the stability of the vibration phase can be judged manually by calculating the difference and setting the second stability threshold based on experience), then the rotor has an imbalance problem.

[0065] During unit startup, the unit sequentially experiences critical speed, rated speed, and load conditions. Data is recorded during startup. If any of the above balance conditions are met, the unit has an imbalance problem, and the process proceeds to step 8). Otherwise, it is not an imbalance problem, the process ends, and other processes are initiated. In this embodiment, if... Figure 3As shown, on August 5, 2022, the unit's load was 565MW and the real-time speed was 2999.6RPM. To determine whether the unit's startup phase was stable during previous starts, the startup data from June 9, 2022 was examined. The data at time 1 and time 2 were the real-time data and the startup data from June 9, 2022, respectively. The difference between their first harmonic amplitude values ​​can be used to determine whether the phase is stable. The second harmonic amplitude value, the 0.5 harmonic amplitude value, the second harmonic amplitude value, etc., can be used for the analysis and diagnosis of other faults.

[0066] When there is an imbalance problem in the unit, perform the following steps:

[0067] 8) Determine the bearing location where the vibration caused by the imbalance is located, and select the weighting plane for dynamic balancing based on the bearing location where the vibration caused by the imbalance is located, and obtain the influence coefficient of the weighting plane; specifically, when judging the imbalance problem, compare the real-time vibration parameter information of each measuring point on the rotor with the balance conditions respectively. If there are measuring points where the real-time vibration parameters do not meet the balance conditions, then the unit has an imbalance problem. Determine the bearing location where the vibration caused by the imbalance is located based on the installation position of the measuring points; then, the weighting plane for dynamic balancing can be manually selected. Single-plane weighting and double-plane weighting can be selected. Different weighting planes will give different influence coefficients. The influence coefficient is initially preset by the staff based on the unit type and experience. After multiple uses, the influence coefficient obtained is the new influence coefficient updated after the last dynamic balancing;

[0068] 9) Based on the vibration magnitude, influence coefficient, and selection of the weighting plane, the location and weight of the weighting can be automatically calculated, i.e., which balance hole of the rotor the balance block needs to be installed in and the mass of the balance block.

[0069] 10) Considering that there are already balance weights on the rotor, based on the current position of the balance weights installed on the rotor, determine whether the calculated position of the balance weight to be added is the same as the initial position of the balance weights of the unit. If there is a position conflict, proceed to 11); otherwise, proceed to 12).

[0070] 11) Select other balance holes near the original calculation position, and decompose the balance block to be weighted to the new weighting balance hole position by vector decomposition to obtain the new weighting position and mass;

[0071] 12) On the rotor 3D interface, based on the calculated counterweight position, mark the weight and angle information of the counterweight at the corresponding position on the rotor 3D model;

[0072] 13) Based on the markings on the rotor 3D model, the staff added the corresponding mass of the balance block at the corresponding position on the unit rotor on site;

[0073] 14) After adding weight, restart the machine and test the vibration parameters. If the vibration abnormality problem still exists, record the current rotor vibration parameters, remove the balance weight, delete the balance weight marking information in the rotor three-dimensional system, and go to 15). Otherwise, the vibration abnormality problem is eliminated, and go to 17).

[0074] 15) Determine whether the emphasized plane needs to be reselected. If it needs to be reselected, go to 8); otherwise, go to 16).

[0075] 16) Based on the impact of this weighting on the unit vibration, using the vibration information before and after the weighting, calculate the new influence coefficient of the weighting plane, update the built-in influence coefficient, and go to 9).

[0076] 17) If the vibration value is normal and the rotor shaft vibration is ≤70μm after balancing, the dynamic balancing is completed. Save the three-dimensional model of the weighted balancing block and the influence coefficient, and issue a dynamic balancing report. The report includes the vibration parameters before dynamic balancing, the weighting information, and the vibration of the unit after weighting.

[0077] This application provides a three-dimensional visual dynamic balancing method for steam turbine generator sets. It generates a three-dimensional visual model of the rotor based on the unit's structural parameters. The model is marked with key phase information and information on currently added balancing blocks. It can determine whether an imbalance problem exists based on the unit's vibration parameters and provides a complete operating procedure to guide power plant personnel in performing dynamic balancing. This method does not require extensive vibration expertise from personnel and is simple to operate. Added balancing blocks can be displayed on the rotor's three-dimensional model, guiding personnel in setting them on-site. This method models the unit and streamlines the dynamic balancing process, making the problem intuitive and the operation convenient.

[0078] This application can also automatically generate and save dynamic balancing technical reports, update and save the weighting influence coefficients of each rotor, and facilitate the supervision and management of vibration technology of steam turbine generator sets.

[0079] This application provides single-plane and dual-plane weighting options during dynamic balancing. Different weighting influence coefficients are set for each plane of different rotors, and staff can choose according to the actual situation to achieve the best dynamic balancing effect.

[0080] This application also provides a dynamic balancing system for a steam turbine generator set, based on the above-mentioned dynamic balancing method for steam turbine generator sets, including:

[0081] The model building module is used to build a three-dimensional model of the rotor and determine each weighting plane and its influence coefficient.

[0082] The parameter acquisition module is used to acquire real-time vibration parameter information of the unit rotor;

[0083] The operating condition acquisition module is used to acquire the current operating condition of the unit, which is divided into over-critical, rated speed and load conditions.

[0084] The imbalance judgment module is used to determine whether the unit has an imbalance problem based on real-time vibration parameter information and preset balance conditions under various operating conditions.

[0085] The dynamic balancing module is used to perform the following steps when there is an imbalance problem in the unit:

[0086] S1. Determine the bearing location where the vibration caused by the imbalance is located, select the weighting plane for dynamic balancing based on the bearing location where the vibration caused by the imbalance is located, and obtain the influence coefficient of the weighting plane;

[0087] S2. Calculate the weighting position and weight of the balance block based on real-time vibration parameter information, the selection of the weighting plane, and the influence coefficient;

[0088] S3. Mark the balance blocks on the rotor 3D model, and add the corresponding mass balance blocks at the corresponding positions on the rotor according to the markings on the rotor 3D model;

[0089] S4. Restart the unit. If there is no imbalance problem, end the dynamic balancing. Otherwise, record the vibration parameters of the rotor after weighting, remove the added balance block. If it is necessary to reselect the weighting plane, execute step S1. Otherwise, use the vibration parameters of the rotor before and after weighting to calculate the influence coefficient, update the influence coefficient of the weighting plane, and execute step S2.

[0090] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A dynamic balancing method for a steam turbine generator set, characterized in that, Specifically: Establish a three-dimensional model of the rotor and determine the influence coefficients of each weighting plane; obtain real-time vibration parameters of the unit rotor; obtain the current operating conditions of the unit, which are divided into overcritical, rated speed, and load conditions; based on the real-time vibration parameters and the preset balance conditions under each operating condition, determine whether there is an imbalance problem in the unit; if there is an imbalance problem in the unit, perform the following steps: S1. Determine the bearing location where the vibration caused by the imbalance is located, select the weighting plane for dynamic balancing based on the bearing location where the vibration caused by the imbalance is located, and obtain the influence coefficient of the weighting plane; S2. Calculate the weighting position and weight of the balance block based on real-time vibration parameter information, the selection of the weighting plane, and the influence coefficient; S3. Mark the balance blocks on the rotor 3D model, and add the corresponding mass balance blocks at the corresponding positions on the rotor according to the markings on the rotor 3D model; S4. Restart the unit. If there is no imbalance problem, end the dynamic balancing. Otherwise, record the vibration parameter information after the rotor is weighted, remove the added balance block. If it is necessary to reselect the weighting plane, execute step S1. Otherwise, use the vibration parameter information before and after the rotor is weighted to calculate the influence coefficient, update the influence coefficient of the weighting plane, and execute step S2. Creating a 3D model of the rotor includes: Obtain the original modeling parameters of the rotor, including design drawings, key phase positions, and balance hole positions; establish an initial 3D rotor model based on the original modeling parameters; obtain the key phase and initial balance block information of the rotor, including key phase positions, initial balance block weight information, the weighting plane where the initial balance block is located, and the angle of the initial balance block relative to the key phase positions; mark the key phase and initial balance block information on the initial 3D rotor model; The equilibrium condition for an unbalanced problem under overcritical conditions is: Based on real-time vibration parameter information, the vibration of the unit at critical speed is obtained, the proportion of the first harmonic component is obtained, the vibration phase of the unit at this time and the historical vibration phase of the unit at startup are obtained. If the vibration of the unit at critical speed is greater than or equal to the first vibration threshold, and the proportion of the first harmonic component exceeds the first proportion threshold, and the difference between the vibration phase of the current time and the historical vibration phase at startup is less than the first stability threshold, then the unit has an imbalance problem. In step S2, if the calculated weighting position of the balance block conflicts with the initial balance block position of the unit, the balance block is decomposed by vector to the new balance hole position to obtain the new weighting position and weight.

2. The dynamic balancing method for a steam turbine generator set according to claim 1, characterized in that, In step S1, determining whether the unit has an imbalance problem specifically involves: The real-time vibration parameter information of each measuring point on the rotor is obtained, and the real-time vibration parameter information of each measuring point is compared with the preset balance conditions under each operating condition. If there are measuring points whose real-time vibration parameters do not meet the balance conditions, the unit has an imbalance problem. The bearing position where the vibration caused by the imbalance is located is determined according to the installation position of the measuring points.

3. The dynamic balancing method for a steam turbine generator set according to claim 1, characterized in that, Step S4 also includes: if there is no imbalance problem in the unit, a balance report is generated, which records the vibration parameter information before and after balancing, as well as the weighting position and weight of the balance block.

4. The dynamic balancing method for a steam turbine generator set according to claim 1, characterized in that, In step S1, the influence coefficient of the weighting plane is a preset value or the influence coefficient value updated in the last dynamic balance.

5. A dynamic balancing system for a steam turbine generator set, characterized in that, The dynamic balancing method for steam turbine generator sets as described in any one of claims 1-4 includes: The model building module is used to build a three-dimensional model of the rotor and determine each weighting plane and its influence coefficient. The parameter acquisition module is used to acquire real-time vibration parameter information of the unit rotor; The operating condition acquisition module is used to acquire the current operating condition of the unit, which is divided into over-critical, rated speed and load conditions. The imbalance judgment module is used to determine whether the unit has an imbalance problem based on real-time vibration parameter information and preset balance conditions under various operating conditions. The dynamic balancing module is used to perform the following steps when there is an imbalance problem in the unit: S1. Determine the bearing location where the vibration caused by the imbalance is located, select the weighting plane for dynamic balancing based on the bearing location where the vibration caused by the imbalance is located, and obtain the influence coefficient of the weighting plane; S2. Calculate the weighting position and weight of the balance block based on real-time vibration parameter information, the selection of the weighting plane, and the influence coefficient; S3. Mark the balance blocks on the rotor 3D model, and add the corresponding mass balance blocks at the corresponding positions on the rotor according to the markings on the rotor 3D model; S4. Restart the unit. If there is no imbalance problem, end the dynamic balancing. Otherwise, record the vibration parameters of the rotor after weighting, remove the added balance block. If it is necessary to reselect the weighting plane, execute step S1. Otherwise, use the vibration parameters of the rotor before and after weighting to calculate the influence coefficient, update the influence coefficient of the weighting plane, and execute step S2.

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