Method, device and equipment for suppressing secondary torsional vibration of shaft system of steam turbine synchronous generator unit and storage medium

Abstract

The application discloses a steam turbine synchronous generator set shaft system subsynchronous torsional vibration suppression method, device, equipment and storage medium, and is used for solving the technical problem that the steam turbine synchronous generator set exists shaft system subsynchronous torsional vibration risk. The application comprises the following steps: establishing a mass-spring system model of a shaft system of a steam turbine synchronous generator set; determining a critical stable torsional vibration mode by simultaneously solving the mass-spring system model and a preset synchronous generator set equation; inputting a mode angle increment corresponding to the critical stable torsional vibration mode into an additional control loop of a preset power system stabilizer to output a compensation signal; and superimposing the compensation signal and a basic control output signal of the power system stabilizer to obtain a suppression signal, wherein the suppression signal is used for suppressing the shaft system subsynchronous torsional vibration of the steam turbine synchronous generator set.

Description

Technical Field

[0001] This invention relates to the field of subsynchronous torsional vibration technology of shaft systems, and in particular to a method, device, equipment and storage medium for suppressing subsynchronous torsional vibration of the shaft system of a steam turbine synchronous generator set. Background Technology

[0002] Improper series capacitor compensation in transmission lines can not only cause self-excitation in the power system, but may also trigger more severe electromechanical coupling oscillations. These oscillations have a frequency significantly higher than low-frequency oscillations, but lower than the system's synchronous frequency; the academic community refers to this electromechanical coupling oscillation as subsynchronous resonance. Furthermore, because the greatest danger of this oscillation is that it can cause torsional oscillations in the turbine generator rotor shaft system, affecting the rotor's mechanical performance and lifespan, and in severe cases, potentially leading to shaft breakage and disrupting the safe operation of the power system, this oscillation phenomenon is also called shaft torsional vibration.

[0003] When the generator rotor oscillates at the natural torsional frequency of the shaft system, it induces a voltage component in the stator at a subsynchronous frequency (complementary to the natural torsional frequency). When the frequency of this voltage component is close to the electrical resonant frequency, it maintains the subsynchronous torque generated on the rotor. However, when the subsynchronous torque is in phase with the rotor speed increment and is equal to or greater than the rotor's natural mechanical damping torque, it exacerbates the torsional vibration of the shaft system. Under these conditions, even if the voltage induced in the armature by the rotor oscillation is very low, the current generated by the subvoltage will strengthen the subsynchronous current generated by the disturbance in the system. The combined subsynchronous current will also generate sufficient torque to maintain the initial rotor torsional oscillation and continuously increase the oscillation amplitude. Summary of the Invention

[0004] This invention provides a method, apparatus, equipment, and storage medium for suppressing subsynchronous torsional vibration of the shaft system in a steam turbine synchronous generator set, which is used to solve the technical problem of the risk of subsynchronous torsional vibration of the shaft system in a steam turbine synchronous generator set.

[0005] This invention provides a method for suppressing subsynchronous torsional vibration of the shaft system of a steam turbine synchronous generator set, wherein the steam turbine synchronous generator set is connected in series with multiple sets of static blocking filters; the method includes:

[0006] Establish a mass-spring system model of the shaft system of a steam turbine synchronous generator set;

[0007] By combining the mass-spring system model and the preset synchronous generator equations, the critical stable torsional vibration mode is determined.

[0008] The modal rotation increment corresponding to the critical stable torsional vibration mode is input into the additional control loop of the preset power system stabilizer, and a compensation signal is output.

[0009] The compensation signal is superimposed with the basic control output signal of the power system stabilizer to obtain a suppression signal, which is used to suppress the subsynchronous torsional vibration of the shaft system of the turbine synchronous generator set.

[0010] Optionally, the steam turbine synchronous generator set is equipped with an armature current subsynchronous oscillation relay; the method further includes:

[0011] When the armature current subsynchronous oscillation relay detects a continuous subsynchronous oscillation component in the armature current of the turbine synchronous generator set, it disconnects the turbine synchronous generator set from the power system to suppress shaft subsynchronous torsional vibration.

[0012] Optionally, the step of inputting the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer and outputting a compensation signal includes:

[0013] Calculate the phase compensation coefficient of the additional control loop;

[0014] The modal rotation increment corresponding to the critical stable torsional vibration mode is input into the additional control loop of the preset power system stabilizer, and the input signal is proportionally amplified and phase-compensated according to the phase compensation coefficient to obtain the compensation signal.

[0015] Optionally, the step of calculating the phase compensation coefficient of the additional control loop includes:

[0016] The mass-spring system model is transformed to obtain a modal decoupling model;

[0017] The electrical torque corresponding to the modal electromagnetic power of each mode is obtained, and the electrical torque is decomposed according to the modal rotation angle direction and modal rotation speed direction corresponding to each mode to obtain the electrical torque decomposition model;

[0018] The modal damping torque coefficients are calculated using the electrical torque decomposition model and the modal decoupling model.

[0019] The modal damping torque coefficient is compared with the preset damping coefficient to determine the phase compensation coefficient.

[0020] The present invention also provides a subsynchronous torsional vibration suppression device for the shaft system of a steam turbine synchronous generator set, wherein the steam turbine synchronous generator set is connected in series with multiple sets of static blocking filters; the device includes:

[0021] The mass-spring system model building module is used to build a mass-spring system model of the turbine synchronous generator set shaft system.

[0022] The critical stability torsional vibration mode determination module is used to determine the critical stability torsional vibration mode by combining the mass-spring system model and the preset synchronous generator set equations.

[0023] The compensation signal output module is used to input the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer and output a compensation signal.

[0024] The suppression signal generation module is used to superimpose the compensation signal with the basic control output signal of the power system stabilizer to obtain a suppression signal, which is used to suppress the subsynchronous torsional vibration of the shaft system of the steam turbine synchronous generator set.

[0025] Optionally, the steam turbine synchronous generator set is equipped with an armature current subsynchronous oscillation relay; the device further includes:

[0026] The disconnection module is used to disconnect the turbine synchronous generator set from the power system when the armature current subsynchronous oscillation relay detects a continuous subsynchronous oscillation component in the armature current of the turbine synchronous generator set, in order to suppress the subsynchronous torsional vibration of the shaft system.

[0027] Optionally, the compensation signal output module includes:

[0028] The phase compensation coefficient calculation submodule is used to calculate the phase compensation coefficient of the additional control loop;

[0029] The compensation signal generation submodule is used to input the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer, and to proportionally amplify and phase compensate the input signal according to the phase compensation coefficient to obtain the compensation signal.

[0030] Optionally, the phase compensation coefficient calculation submodule includes:

[0031] The modal decoupling model generation unit is used to transform the mass-spring system model to obtain the modal decoupling model;

[0032] An electrical torque decomposition model generation unit is used to obtain the electrical torque corresponding to the modal electromagnetic power of each mode, and decompose the electrical torque according to the modal rotation angle direction and modal rotation speed direction corresponding to each mode to obtain an electrical torque decomposition model;

[0033] The modal damping torque coefficient calculation unit is used to calculate the modal damping torque coefficient using the electrical torque decomposition model and the modal decoupling model.

[0034] The phase compensation coefficient determination unit is used to compare the modal damping torque coefficient with the preset damping coefficient to determine the phase compensation coefficient.

[0035] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0036] The memory is used to store program code and transmit the program code to the processor;

[0037] The processor is used to execute the method for suppressing secondary torsional vibration of the turbine synchronous generator shaft system as described above, according to the instructions in the program code.

[0038] The present invention also provides a computer-readable storage medium for storing program code for executing the method for suppressing subsynchronous torsional vibration of the turbine synchronous generator shaft system as described in any of the preceding claims.

[0039] As can be seen from the above technical solutions, the present invention has the following advantages: The present invention suppresses subsynchronous torsional vibration by connecting multiple sets of static blocking filters in series with the turbine synchronous generator set. Furthermore, the present invention determines the critical stable torsional vibration mode using a mass-spring system model and preset synchronous generator set equations, and performs damping accessory control through the modal rotation increment corresponding to the critical stable torsional vibration mode, thereby achieving suppression of subsynchronous torsional vibration. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A flowchart illustrating the steps of a method for suppressing secondary synchronous torsional vibration in the shaft system of a steam turbine synchronous generator set, as provided in an embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram of the structure of a static blocking filter provided in an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of a power system stabilizer (PSS) with an additional control loop;

[0044] Figure 4 This is a structural block diagram of a subsynchronous torsional vibration suppression device for a turbine synchronous generator set shaft system, provided in an embodiment of the present invention. Detailed Implementation

[0045] This invention provides a method, apparatus, equipment, and storage medium for suppressing subsynchronous torsional vibration of the shaft system in a steam turbine synchronous generator set, which is used to solve the technical problem of the risk of subsynchronous torsional vibration of the shaft system in a steam turbine synchronous generator set.

[0046] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] Please see Figure 1 , Figure 1 The flowchart illustrates the steps of a method for suppressing subsynchronous torsional vibration in the shaft system of a steam turbine synchronous generator set, as provided in an embodiment of the present invention.

[0048] This invention provides a method for suppressing subsynchronous torsional vibration of the shaft system in a steam turbine synchronous generator set, wherein the steam turbine synchronous generator set is connected in series with multiple sets of static blocking filters. A steam turbine synchronous generator is a generator driven by a steam turbine. Superheated steam generated by the boiler enters the steam turbine, expands, and performs work, causing the blades to rotate and drive the generator to produce electricity. The exhaust steam after performing work is sent back to the boiler for recycling through a condenser, circulating water pump, condensate pump, feedwater heating device, etc. Static blocking filters include... Figure 2 The image shows a filter composed of an LC oscillating circuit. By selecting the filter parameters, it is made to achieve parallel resonance at the complementary frequency of a certain natural frequency of the axis system, i.e.:

[0049]

[0050] Where f1 is a fixed frequency of the axis system, L1 is the inductance value of the static blocking filter, and C1 is the capacitance value of the static blocking filter.

[0051] At this point, the static blocking filter presents a large positive resistance to the external power system. Connecting the static blocking filter in series with each phase of the generator step-up transformer to block or weaken the interaction between the mechanical and electrical subsystems prevents the resonance of the electrical subsystems from adversely affecting the generator shaft system and suppresses the risk of subsynchronous torsional vibration. Since the static blocking filter does not resonate at the power frequency, connecting it to the system will not adversely affect its normal operation. Similarly, filter parameters corresponding to other natural frequencies of the generator shaft system are designed, and all static blocking filters are connected in series with the generator step-up transformer.

[0052] After suppressing subsynchronous torsional vibration by adding a static blocking filter, the suppression effect on the risk of subsynchronous torsional vibration can be further improved by software control, which can specifically include the following steps:

[0053] Step 101: Establish a mass-spring system model of the turbine synchronous generator set shaft system;

[0054] In this embodiment of the invention, the modal speed increment and modal rotation angle increment in the transmission line system can be selected as feedback signals, and additional control can be designed for a certain torsional vibration mode to provide positive damping to the torsional vibration mode in order to suppress the risk of subsynchronous torsional vibration.

[0055] Speed ​​increment refers to the deviation of the instantaneous speed of a steam turbine synchronous generator from its rated speed or a given reference speed.

[0056] The rotation increment refers to the angular deviation of the rotor shaft center position of a steam turbine synchronous generator relative to a reference shaft rotating at synchronous speed.

[0057] Modal speed increment and modal rotation angle increment are linear combinations of speed increment and rotation angle increment of each segment of the shaft system, obtained by transforming the speed increment and rotation angle increment of each segment of the shaft system through a modal transformation matrix.

[0058] It should be noted that the modal speed increment and modal rotation angle increment were chosen as feedback signals because using a certain speed increment or rotation angle increment of the shaft system as a feedback signal, the additional control designed for a certain torsional vibration mode may have an adverse effect on other torsional vibration modes while providing positive damping to that torsional vibration mode.

[0059] Before applying additional control to each mode, it is necessary to determine which modes require additional control. Therefore, in this embodiment of the invention, a mass-spring system model of the shaft system can be established first:

[0060]

[0061] Among them, T J D, K, and T are n-dimensional vectors, where n represents the number of turbine shaft segments, and T represents the number of segments. J For example, TJ includes T J1 -T Jn T Ji Let p be the inertial time constant of the i-th mass block, where i represents the index of the n-dimensional vector, i = 1, 2, 3, ..., n, and p is the differential operator. Let T be the electrical angular displacement of the i-th mass block in the shaft system relative to the synchronously rotating reference axis, where D represents the damping coefficient, K represents the stiffness coefficient, and T is the electrical angular displacement of the i-th mass block in the shaft system relative to the synchronously rotating reference axis. i Let be the driving torque acting on the i-th mass block of the steam turbine.

[0062] Next, the following transformation is introduced into the mass-spring system model:

[0063]

[0064] Each column of matrix Q is composed of... The eigenvectors are composed of [variables]. Through transformation, the modal rotation vector can be obtained. We can obtain the following formula:

[0065]

[0066] Among them, T Jm K m T is a diagonal matrix. m Let D be a column vector. m It is a non-diagonal matrix.

[0067] Step 102: Combine the mass-spring system model and the preset synchronous generator equations to determine the critical stable torsional vibration mode;

[0068] After obtaining the mass-spring system model of the turbine synchronous generator shaft system, the preset synchronous generator equations can be established simultaneously (which synchronous generator equation to use can be selected according to actual needs, and the embodiments of the present invention do not impose specific restrictions on this). The eigenvalue analysis method is used to determine which torsional vibration modes produce non-negligible negative damping and to bring the system to a critical stable state.

[0069] In one example, according to Lyapunov's first stability principle, the small-range stability of a nonlinear system is determined by the roots of the characteristic equation after linearization, i.e., the eigenvalues ​​of the Jacobian matrix A. When the real parts of all eigenvalues ​​of A are negative, the linearized system is asymptotically stable, and the original nonlinear system is also asymptotically stable in the small range. When at least one eigenvalue of A has a positive real part, the linearized system is unstable, and the original system is also unstable in the small range. When at least one eigenvalue of A has a real part of 0, and the real parts of the other eigenvalues ​​are negative, the system is critically stable.

[0070] Linearize the equations obtained by combining the equations at the equilibrium point and write them in the following form:

[0071]

[0072] Where x is the state variable of the system, and A is the coefficient matrix of the linearized system, also called the Jacobian matrix; then the eigenvalues ​​of the coefficient matrix are calculated; the stability of the original nonlinear system is determined based on the eigenvalues, thereby determining the critical stable torsional vibration mode.

[0073] Step 103: Input the modal rotation increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer, and output the compensation signal;

[0074] In this embodiment of the invention, the power system stabilizer PSS is as follows: Figure 3 As shown, it includes traditional PSS control and additional control loops.

[0075] in, The part that is input, passes through the control loop, and outputs is the traditional PSS control. The feedback signal is the modal rotation speed of the torsional vibration mode that is on the edge of instability.

[0076] like Figure 3 As shown, the phase compensation stage is as follows:

[0077]

[0078] Where s is the Laplace operator, used to compensate for the phase lag of the system's forward transfer function at the torsional vibration mode frequency. The values ​​of T1, T2, and K are usually determined empirically, for example, T1 = 0.03s, T2 = 0.08, and K = 1. Let... Or 180°, where G E To output U from PSS E To the excitation regulator output The sum of the system's forward transfer function, including feedback, is either 0° or 180° depending on which factor makes G... i c The principle is to minimize the number of steps in (s).

[0079] A compensation signal can be generated through the phase compensation stage, which, combined with the traditional PSS control section, can suppress subsynchronous torsional vibration.

[0080] In one example, step 103 may include the following sub-steps:

[0081] S31, Calculate the phase compensation coefficient of the additional control loop;

[0082] Step S31 may include the following sub-steps:

[0083] S311, Transform the mass-spring system model to obtain the modal decoupling model;

[0084] S312, obtain the electrical torque corresponding to the modal electromagnetic power of each mode, and decompose the electrical torque according to the modal rotation direction and modal rotation speed direction corresponding to each mode to obtain the electrical torque decomposition model;

[0085] S313, the modal damping torque coefficient is calculated using the electrical torque decomposition model and the modal decoupling model;

[0086] S314, compare the modal damping torque coefficient with the preset damping coefficient to determine the phase compensation coefficient.

[0087] In the specific implementation, D is ignored. m The off-diagonal elements do not introduce significant errors, so they are ignored, resulting in a diagonal matrix with diagonal elements D. mi This is called modal damping. Therefore, the modal equations in the transformed mass-spring system model are independent of each other, and the modal decoupling model of the shaft system can be obtained as follows:

[0088]

[0089] State variables and modal variables The relationship between them is as follows:

[0090]

[0091] The electrical torque generated by modal electromagnetic power in a mode can be decomposed into two parts, which are related to the modal rotation angle. same direction and with Two components of the modal rotational speed in the same direction: the former is called the modal synchronizing torque, and the latter is called the modal damping torque. Insufficiency of either, or any insufficiency of either, can lead to instability in the corresponding mode. The electrical torque decomposition model is as follows:

[0092]

[0093] in, Let the electrical torque be the value of the i-th mode. and These are the modal synchronization torque coefficient and modal damping torque coefficient generated in mode i, respectively.

[0094] By combining the modal decoupling model and the electrical torque decomposition model, the modal damping torque coefficient of the system in mode i can be obtained. By setting the value of the modal damping torque coefficient to a pre-defined damping coefficient, the phase compensation coefficient K can be obtained. ci .

[0095] S32 inputs the modal rotation increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer, and performs proportional amplification and phase compensation on the input signal according to the phase compensation coefficient to obtain the compensation signal.

[0096] After completing the parameter calculation for the phase compensation stage, the modal rotation increment corresponding to the critical stable torsional vibration mode can be input into the additional control loop of the power system stabilizer, and the input signal can be proportionally amplified and phase-compensated to obtain the compensation signal.

[0097] Step 104: The compensation signal is superimposed with the basic control output signal of the power system stabilizer to obtain the suppression signal. The suppression signal is used to suppress the subsynchronous torsional vibration of the turbine synchronous generator set's shaft system.

[0098] After obtaining the compensation signal of the additional control, the compensation signal is superimposed with the basic control output signal of the power system stabilizer to obtain the suppression signal for the subsynchronous torsional vibration of the turbine synchronous generator set shaft system, so as to suppress the risk of subsynchronous torsional vibration of the turbine synchronous generator set shaft system.

[0099] Furthermore, when neither the static blocking filter nor the damping-added control produces a sufficient suppression effect, the embodiments of the present invention further include:

[0100] Step 105: When the armature current subsynchronous oscillation relay detects a continuous subsynchronous oscillation component in the armature current of the turbine synchronous generator set, the turbine synchronous generator set is disconnected from the power system to suppress the shaft subsynchronous torsional vibration.

[0101] In this embodiment of the invention, a protection device based on electrical quantity measurement, namely an armature current subsynchronous oscillation relay, can be installed on the generator set. This relay is very sensitive to the subsynchronous frequency component in the armature current of the generator set. During real-time detection, once a severe subsynchronous oscillation component is found to continuously appear in the armature current, the generator set is immediately disconnected from the system to protect it from torsional vibration damage.

[0102] This invention suppresses subsynchronous torsional vibration by connecting multiple sets of static blocking filters in series with a steam turbine synchronous generator set. Furthermore, this invention determines the critical stable torsional vibration mode using a mass-spring system model and preset synchronous generator set equations, and uses the modal rotation increment corresponding to the critical stable torsional vibration mode for damping accessory control, thereby achieving suppression of subsynchronous torsional vibration.

[0103] Please see Figure 4 , Figure 4 This is a structural block diagram of a subsynchronous torsional vibration suppression device for a turbine synchronous generator set shaft system, provided in an embodiment of the present invention.

[0104] This invention provides a subsynchronous torsional vibration suppression device for the shaft system of a steam turbine synchronous generator set, wherein the steam turbine synchronous generator set is connected in series with multiple sets of static blocking filters; the device includes:

[0105] Mass-Spring System Model Establishment Module 401 is used to establish the mass-spring system model of the turbine synchronous generator set shaft system;

[0106] The critical stability torsional vibration mode determination module 402 is used to determine the critical stability torsional vibration mode by combining the mass-spring system model and the preset synchronous generator set equations.

[0107] The compensation signal output module 403 is used to input the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer and output the compensation signal.

[0108] The suppression signal generation module 404 is used to superimpose the compensation signal with the basic control output signal of the power system stabilizer to obtain the suppression signal, which is used to suppress the subsynchronous torsional vibration of the shaft system of the steam turbine synchronous generator set.

[0109] In this embodiment of the invention, the steam turbine synchronous generator set is equipped with an armature current subsynchronous oscillation relay; the device further includes:

[0110] The disconnection module 405 is used to disconnect the turbine synchronous generator set from the power system when the armature current subsynchronous oscillation relay detects a continuous subsynchronous oscillation component in the armature current of the turbine synchronous generator set, so as to suppress the subsynchronous torsional vibration of the shaft system.

[0111] In this embodiment of the invention, the compensation signal output module 403 includes:

[0112] The phase compensation coefficient calculation submodule is used to calculate the phase compensation coefficient of the additional control loop.

[0113] The compensation signal generation submodule is used to input the modal rotation increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer, and to proportionally amplify and phase compensate the input signal according to the phase compensation coefficient to obtain the compensation signal.

[0114] In this embodiment of the invention, the phase compensation coefficient calculation submodule includes:

[0115] The modal decoupling model generation unit is used to transform the mass-spring system model to obtain the modal decoupling model;

[0116] The electrical torque decomposition model generation unit is used to obtain the electrical torque corresponding to the modal electromagnetic power of each mode, and decompose the electrical torque according to the modal rotation direction and modal rotation speed direction corresponding to each mode to obtain the electrical torque decomposition model;

[0117] The modal damping torque coefficient calculation unit is used to calculate the modal damping torque coefficient using the electrical torque decomposition model and the modal decoupling model.

[0118] The phase compensation coefficient determination unit is used to compare the modal damping torque coefficient with the preset damping coefficient to determine the phase compensation coefficient.

[0119] This invention also provides an electronic device, which includes a processor and a memory:

[0120] The memory is used to store program code and transfer the program code to the processor;

[0121] The processor is used to execute the method for suppressing subsynchronous torsional vibration of the turbine synchronous generator set shaft system according to the instructions in the program code of this invention.

[0122] This invention also provides a computer-readable storage medium for storing program code, which is used to execute the method for suppressing subsynchronous torsional vibration of the turbine synchronous generator shaft system according to this invention.

[0123] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0124] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0125] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention can take the form of computer program products 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 code.

[0126] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0127] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0129] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0130] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0131] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0132] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for suppressing subsynchronous torsional vibration of the shaft system of a steam turbine synchronous generator set, characterized in that, The steam turbine synchronous generator set is connected in series with multiple sets of static blocking filters; the method includes: Establish a mass-spring system model of the shaft system of a steam turbine synchronous generator set; By combining the mass-spring system model and the preset synchronous generator equations, the critical stable torsional vibration mode is determined. The modal rotation increment corresponding to the critical stable torsional vibration mode is input into the additional control loop of the preset power system stabilizer, and a compensation signal is output. The compensation signal is superimposed with the basic control output signal of the power system stabilizer to obtain a suppression signal, which is used to suppress the subsynchronous torsional vibration of the shaft system of the steam turbine synchronous generator set. The step of inputting the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer and outputting a compensation signal includes: Calculate the phase compensation coefficient of the additional control loop; The modal rotation increment corresponding to the critical stable torsional vibration mode is input into the additional control loop of the preset power system stabilizer, and the input signal is proportionally amplified and phase-compensated according to the phase compensation coefficient to obtain the compensation signal; The step of calculating the phase compensation coefficient of the additional control loop includes: The mass-spring system model is transformed to obtain a modal decoupling model; The electrical torque corresponding to the modal electromagnetic power of each mode is obtained, and the electrical torque is decomposed according to the modal rotation angle direction and modal rotation speed direction corresponding to each mode to obtain the electrical torque decomposition model; The modal damping torque coefficients are calculated using the electrical torque decomposition model and the modal decoupling model. The modal damping torque coefficient is compared with the preset damping coefficient to determine the phase compensation coefficient.

2. The method according to claim 1, characterized in that, The turbine synchronous generator set is equipped with an armature current subsynchronous oscillation relay; the method further includes: When the armature current subsynchronous oscillation relay detects a continuous subsynchronous oscillation component in the armature current of the turbine synchronous generator set, it disconnects the turbine synchronous generator set from the power system to suppress shaft subsynchronous torsional vibration.

3. A device for suppressing subsynchronous torsional vibration of the shaft system of a steam turbine synchronous generator set, characterized in that, The steam turbine synchronous generator set is connected in series with multiple sets of static blocking filters; the device includes: The mass-spring system model building module is used to build a mass-spring system model of the turbine synchronous generator set shaft system. The critical stability torsional vibration mode determination module is used to determine the critical stability torsional vibration mode by combining the mass-spring system model and the preset synchronous generator set equations. The compensation signal output module is used to input the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer and output a compensation signal. The suppression signal generation module is used to superimpose the compensation signal with the basic control output signal of the power system stabilizer to obtain a suppression signal, which is used to suppress the shaft subsynchronous torsional vibration of the turbine synchronous generator set. The compensation signal output module includes: The phase compensation coefficient calculation submodule is used to calculate the phase compensation coefficient of the additional control loop; The compensation signal generation submodule is used to input the modal rotation angle increment corresponding to the critical stable torsional vibration mode into the additional control loop of the preset power system stabilizer, and to perform proportional amplification and phase compensation on the input signal according to the phase compensation coefficient to obtain the compensation signal; The phase compensation coefficient calculation submodule includes: The modal decoupling model generation unit is used to transform the mass-spring system model to obtain the modal decoupling model; An electrical torque decomposition model generation unit is used to obtain the electrical torque corresponding to the modal electromagnetic power of each mode, and decompose the electrical torque according to the modal rotation angle direction and modal rotation speed direction corresponding to each mode to obtain an electrical torque decomposition model; The modal damping torque coefficient calculation unit is used to calculate the modal damping torque coefficient using the electrical torque decomposition model and the modal decoupling model. The phase compensation coefficient determination unit is used to compare the modal damping torque coefficient with the preset damping coefficient to determine the phase compensation coefficient.

4. The apparatus according to claim 3, characterized in that, The turbine synchronous generator set is equipped with an armature current subsynchronous oscillation relay; the device also includes: The disconnection module is used to disconnect the turbine synchronous generator set from the power system when the armature current subsynchronous oscillation relay detects a continuous subsynchronous oscillation component in the armature current of the turbine synchronous generator set, in order to suppress the subsynchronous torsional vibration of the shaft system.

5. An electronic device, characterized in that, The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the method for suppressing subsynchronous torsional vibration of the turbine synchronous generator set shaft system according to any one of the instructions in the program code.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code for executing the method for suppressing subsynchronous torsional vibration of the turbine synchronous generator set shaft system as described in any one of claims 1-2.

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