A method for configuring phase-shift parameters of a STATCOM controller to suppress subsynchronous resonance.

Abstract

This invention discloses a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance, comprising: determining the target generator set to be suppressed by the STATCOM controller, its target torsional vibration mode, and typical operating modes; for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method, calculating the effective range of phase-shifting angles in which the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation; performing an intersection operation on the effective ranges of phase-shifting angles of all typical operating modes to obtain a common safe configuration range; selecting phase-shifting angle values ​​from the safe configuration range and configuring them into the damping control channel of the corresponding key shaft torsional vibration mode in the STATCOM controller.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment and electrical engineering technology, and more specifically, to a method for configuring phase-shifting parameters of a STATCOM controller for suppressing subsynchronous resonance. Background Technology

[0002] In the power system field, the improvement of long-distance power transmission capacity often relies on the application of series capacitor compensation technology. However, this technology also brings about the classic but highly dangerous stability problem of subsynchronous resonance (SSR). When the electrical resonance characteristics of the power grid are adversely coupled with the mechanical torsional vibration modes of the generator shaft system, continuous subsynchronous oscillations may be excited, leading to fatigue damage to critical mechanical components. In severe cases, this can directly cause catastrophic failures, posing a substantial threat to the safety of power generation equipment and the reliable operation of the power grid. To address this challenge, suppression technology based on real-time signal detection and active compensation has become an important engineering solution.

[0003] A STATCOM controller connected in parallel at the turbine generator terminal serves as an effective means of oscillation suppression. By injecting additional control signals into the generator excitation system, it can effectively enhance the damping effect of the system on subsynchronous / supersynchronous oscillations. The core components typically include a DQ coordinate transformation stage, a phase-shifting stage, and a control gain stage. Among these, the parameter calculation and tuning of the phase-shifting stage are particularly critical, directly affecting the controller's suppression effect on specific oscillation modes. Existing research suggests that the close electrical distance between the turbine-terminal STATCOM and the synchronous machine means that changes in system operating conditions have a relatively small impact on its damping control characteristics, and the configured control parameters have broad adaptability. Therefore, existing parameter tuning processes are usually relatively simple, often relying on experience and single scenarios, selecting limited standard operating conditions for parameter measurement and fixed settings, lacking a systematic multi-scenario verification and optimization process. However, the actual power grid is a highly complex and constantly changing dynamic system, whose operating mode is comprehensively affected by multiple factors such as power distribution, network topology, load levels, and the status of compensation equipment. Any significant change in these factors may reshape the impedance frequency characteristics of the power grid, thereby affecting the ideal phase compensation angle required for the suppression loop, making parameter strategies based on a single fixed point face potential failure risks. In a recent actual project, it was also found that after configuring a STATCOM with sufficient capacity at the generator end, the unit shaft system exhibited continuous and large-amplitude torsional vibration under certain operating modes. This indicates that the subsynchronous resonance damping control of the STATCOM is weak or ineffective, and its control parameters cannot adapt to the multiple operating modes of the system. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance.

[0005] According to one aspect of the present invention, a method for configuring phase-shifting parameters of a STATCOM controller for suppressing subsynchronous resonance is provided, comprising: Determine the target generator set, its target torsional vibration mode, and typical operating mode that the STATCOM controller needs to suppress; For each typical operating mode in the set of typical operating modes, the effective range of the phase shift angle that the STATCOM controller can provide positive electrical damping for the target torsional vibration mode is calculated in electromagnetic transient simulation using the modal waveform envelope attenuation constant comparison method. By performing an intersection operation on the effective phase shift angle intervals of all typical operating modes, a common safety configuration interval is obtained; Select a phase shift angle value from the safe configuration range and configure it into the damping control channel of the corresponding critical shaft torsional vibration mode in the STATCOM controller.

[0006] Optionally, the typical operating mode set includes: different switching states of series capacitor compensators, different operating modes of transmission lines, and different start-up combinations of generator units within and near the power plant.

[0007] Optionally, the modal waveform envelope attenuation constant comparison method specifically includes: In the electromagnetic transient simulation model, the phase shift angle parameter of the target torsional vibration mode is scanned within its domain with a preset step size. For each phase shift angle value of the scan, time-domain simulation is performed to obtain the time-domain response waveform of the target torsional vibration mode of the unit shaft system after the fault. Calculate the attenuation constant of the envelope of the time-domain response waveform; Based on the attenuation constants corresponding to all scan phase shift angle values, a phase shift angle-attenuation constant relationship curve is plotted, and the continuous range of phase shift angles corresponding to attenuation constants greater than zero is determined as the effective range of phase shift angles under this typical operating mode.

[0008] Optionally, the domain of the phase shift angle parameter is 0° to 360°.

[0009] Optionally, when selecting the final phase shift angle configuration value from the safety configuration range, the center value of the safety configuration range should be selected first.

[0010] Optionally, it also includes: verifying, based on the configured phase shift angle value, under multiple operating modes in a typical operating mode set to confirm that the STATCOM controller can effectively suppress subsynchronous resonance.

[0011] According to another aspect of the present invention, a STATCOM controller phase shift parameter configuration device for suppressing subsynchronous resonance is provided, comprising: The determination module is used to determine the target generator set, its target torsional vibration mode, and typical operating mode that the STATCOM controller needs to suppress. The calculation module is used to calculate the effective range of the phase shift angle that the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method. The calculation module is used to perform intersection calculations on the effective phase shift angle intervals of all typical operating modes to obtain a common safety configuration interval; The configuration module is used to select a phase shift angle value from the safe configuration range and configure it into the damping control channel of the corresponding critical shaft torsional vibration mode in the STATCOM controller.

[0012] Optionally, the typical operating mode set includes: different switching states of series capacitor compensators, different operating modes of transmission lines, and different start-up combinations of generator units within and near the power plant.

[0013] Optionally, the modal waveform envelope attenuation constant comparison method in the calculation module specifically includes: In the electromagnetic transient simulation model, the phase shift angle parameter of the target torsional vibration mode is scanned within its domain with a preset step size. For each phase shift angle value of the scan, time-domain simulation is performed to obtain the time-domain response waveform of the target torsional vibration mode of the unit shaft system after the fault. Calculate the attenuation constant of the envelope of the time-domain response waveform; Based on the attenuation constants corresponding to all scan phase shift angle values, a phase shift angle-attenuation constant relationship curve is plotted, and the continuous range of phase shift angles corresponding to attenuation constants greater than zero is determined as the effective range of phase shift angles under this typical operating mode.

[0014] Optionally, the domain of the phase shift angle parameter is 0° to 360°.

[0015] Optionally, when selecting the final phase shift angle configuration value from the safety configuration range, the center value of the safety configuration range should be selected first.

[0016] Optionally, it also includes: a verification module, used to verify, based on the configured phase shift angle value, under multiple operating modes in a typical operating mode set, to confirm that the STATCOM controller can effectively suppress subsynchronous resonance.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0018] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0019] Therefore, this invention, based on an electromagnetic transient simulation platform, establishes refined unit and grid models to systematically identify effective suppression intervals under different system structures and operating modes, thereby achieving precise damping control of subsynchronous resonance. This invention primarily addresses the shortcomings of existing parameter tuning methods, such as insufficient adaptability to changes in system operating conditions, reliance on experience, and lack of systematic multi-scenario verification. It improves the effectiveness and reliability of STATCOM controllers in real, complex power systems, providing technical support for the safe and stable operation of units and the power grid. Attached Figure Description

[0020] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 This is a flowchart illustrating a method for configuring phase-shifting parameters of a STATCOM controller for suppressing subsynchronous resonance, provided by an exemplary embodiment of the present invention. Figure 2 This is a schematic diagram of modal i-damping control in a STATCOM controller provided by an exemplary embodiment of the present invention; Figure 3 This is a schematic diagram of modal electrical damping under different system modes provided in an exemplary embodiment of the present invention; Figure 4 This is another schematic flowchart of a STATCOM controller phase shift parameter configuration method for suppressing subsynchronous resonance provided by an exemplary embodiment of the present invention; Figure 5 This is a schematic diagram of the time-domain simulation curves of the modal phase shift angle and modal attenuation constant provided by an exemplary embodiment of the present invention; Figure 6 This is a schematic diagram of a 6-machine serial transmission system provided in an exemplary embodiment of the present invention; Figures 7a-7d These are schematic diagrams comparing the modal phase shift angle and modal attenuation constant for 2-line 0-series compensation, 2-line 2-series compensation, 2-line 1-series compensation, and 1-line 1-series compensation provided by an exemplary embodiment of the present invention. Figure 8 This is a schematic diagram of a STATCOM controller access terminal provided in an exemplary embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a STATCOM controller phase-shift parameter configuration device for suppressing subsynchronous resonance provided in an exemplary embodiment of the present invention; Figure 10 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0021] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0022] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0023] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0024] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0025] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0026] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0027] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0028] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0033] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0034] Exemplary methods Figure 1 This is a schematic flowchart illustrating a method for configuring phase-shifting parameters of a STATCOM controller for suppressing subsynchronous resonance, provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as… Figure 1 As shown, the STATCOM controller phase shift parameter configuration method 100 for suppressing subsynchronous resonance includes the following steps: Step 101: Determine the target generator set, its target torsional vibration mode, and typical operating mode that the STATCOM controller needs to suppress; Step 102: For each typical operating mode in the set of typical operating modes, the effective range of the phase shift angle that the STATCOM controller can provide positive electrical damping for the target torsional vibration mode is calculated in the electromagnetic transient simulation using the modal waveform envelope attenuation constant comparison method. Step 103: Perform an intersection operation on the effective phase shift angle intervals of all typical operating modes to obtain a common safety configuration interval; Step 104: Select a phase shift angle value from the safety configuration range and configure it into the damping control channel of the corresponding critical shaft torsional vibration mode in the STATCOM controller.

[0035] Specifically, addressing the problems existing in the background technology, this invention proposes a parameter configuration method for the phase-shifting element of a STATCOM controller connected in parallel at the turbine generator terminal for multiple operating conditions. This method, based on an electromagnetic transient simulation platform, establishes a refined model of the generator unit and power grid, systematically identifying effective suppression intervals under different system structures and operating modes, thereby achieving precise damping control of subsynchronous resonance. This invention focuses on solving the problems of insufficient adaptability to changes in system operating conditions, reliance on experience, and lack of systematic multi-scenario verification in existing parameter tuning methods. It improves the effectiveness and reliability of the STATCOM controller in real, complex power systems, providing technical support for the safe and stable operation of the generator unit and the power grid.

[0036] The STATCOM damping control at the machine terminal adopts a multi-modal channel parallel damping control structure. For example... Figure 2 As shown, the unit shaft speed deviation The output mode i signal after filtering passes through gain and phase shift stages, as well as a dq transformation / dq rotation offset angle stage. This control stage uses PARK inverse transformation to convert the mode signal into a "complementary" sub / supersynchronous frequency current reference value, which is then injected into the machine terminal via the converter output current. The mode phase shift angle... These are fundamental parameters affecting the modal damping level of a closed-loop system, and their basic configuration principle is based on the modal angular frequency. The electromagnetic torque generated by the STATCOM+ unit closed-loop system With modal angular frequency When the included angle of the corresponding vector is less than 90 degrees, it exhibits modal positive electrical damping characteristics, which helps to suppress the SSR of the unit.

[0037] The unit shaft system model with N masses contains N-1 modes. For the i-th mode of the unit shaft system, the unit shaft system speed deviation... The output signal after passing through the zero-phase-shift mode filter is (1) In the formula: For the amplitude of mode i, Let i be the angular frequency of the mode. The initial phase angle is [value]. After mode i gain and phase shifting, the output is [value]. (2) In the formula: For mode i, the gain coefficient is... Let i be the phase shift angle of mode i. The fundamental A-phase voltage angle at the output terminal of the phase-locked loop (PLL) in a STATCOM is set to... The dq rotation offset angle of superimposed mode i After modulation and control, the STATCOM outputs three-phase secondary / supersynchronous frequency currents, where the a-phase current is... (3) In the formula: , These are the sub- / supersynchronous frequency currents of the complementary frequency of mode i, respectively. The STATCOM outputs a sub- / supersynchronous frequency current of equal amplitude injected into the motor terminals. After being shunt on the system side, the current entering the stator of the synchronizer is... (4) In the formula: , These are the secondary / supersynchronous frequency impedances on the machine-side system. , These are the impedances for the synchronous / supersynchronous frequency, respectively. , These are the subsynchronous frequency current shunting coefficient and the additional phase shift, respectively. , These are the supersynchronous frequency current shunting coefficient and the additional phase shift, respectively. Let the power angle of the synchronous machine be... Then the PARK transformation reference angle of the synchronizing machine is Equation (4) gives the stator subsynchronous frequency current transformed by PARK to the dq current in the rotating coordinate system of the synchronous machine as follows: (5) In the formula: , This corresponds to the dq current. The steady-state stator terminal voltage of the synchronous machine can be expressed as... (6) In the formula: , , These represent the stator terminal voltage amplitude and the dq-axis voltage, respectively. , These are the magnetic flux linkages along the d and q axes, The electromagnetic torque generated by the current at this modal frequency is (7) Similarly, the electromagnetic torque generated by the stator supersynchronous current can be obtained as follows: (8) The resultant electromagnetic torque is (9) In the formula , Therefore, the modal i electrical damping provided by STATCOM is (10) It can be seen that configuring a suitable dq rotation offset angle for mode i in the STATCOM controller is crucial. Phase shift angle and gain By injecting sub- / super-synchronous frequency current into the generator terminals via STATCOM, the generator can be excited to produce modal frequency electromagnetic torque, thus enabling... It plays a role in suppressing SSR in the unit.

[0038] Existing STATCOM phase shift parameter tuning methods (such as the open-loop excitation phase comparison method) are typically performed under a single, specific system operating mode (such as series compensation off). Commonly used open-loop excitation phase comparison methods generally compare the open-loop input mode frequencies. Modal response of unit shaft system This is achieved by using the phase difference of waveforms with the same frequency. Under stable SSR system operation, the experimental steps are as follows: (1) Disconnect the unit shaft speed deviation input from the STATCOM mode i control channel. ; (2) In the modal i control channel, input a small-amplitude continuous modal frequency in the open loop. ; (3) When the system reaches steady state, measure the modal response of the unit shaft system. ,analyze and phase difference ; (4) The phase shift angle is configured as follows: Then, the open-loop is converted to a closed-loop, the decay rate of mode i is analyzed, and the effectiveness of the configured parameters is verified.

[0039] When the system operation mode changes (such as series compensation being put into operation, line being put into operation or the start-up mode is changed), the phase shift parameters set in this way may cause the originally set phase shift angle to enter the negative damping region due to the change in the equivalent impedance characteristics of the power grid, thereby causing the STATCOM suppression to fail or even aggravate the oscillation.

[0040] From equation (10), we can obtain that The sign of the value is determined by the modal phase shift angle. and additional phase angle Decision. Under a given system operating mode, an additional phase angle is added. constant, and It is a trigonometric function relationship, theoretically Taking values ​​within a 180-degree width range allows for The center angle of the interval is the optimal phase shift angle, which can provide maximum damping.

[0041] In a series compensation transmission system, the corresponding unit mode frequency complementary frequencies With the system side electrical resonant frequency When the difference is large, , , , For the sense, in equation (4) , ;like and When approaching, It exhibits compatibility, in equation (4) , The variation is significant. Therefore, under different system configurations, the additional phase angle... Significant variations can lead to large differences in the phase shift angle range of positive electrical damping under different system modes.

[0042] like Figure 3 As shown, in both Mode 1 and Mode 2, the phase shift angle range for positive electrical damping is [89.2, 186.8] degrees. If the configured phase shift angle exceeds this range, the electrical damping of one of the modes will be negative, and this configuration cannot adapt to multiple modes of the system.

[0043] Based on this, the present invention overcomes the limitations of the aforementioned single-point tuning and proposes a method for comparing and calculating the attenuation constant of the modal waveform envelope, which utilizes a global adaptive configuration approach of "first separating and then combining, and then obtaining the common safety zone". (1) "Division": For a series of typical power grid operation modes that need to be covered, determine the range of phase shift angle values ​​(i.e. "effective range of positive damping") that STATCOM can provide for the target torsional vibration mode.

[0044] (2) "Combination": Perform an intersection operation on the effective range of positive damping obtained under all methods to obtain a common "safe configuration range" and the optimal phase shift angle.

[0045] (3) "Configuration": Set the phase shift angle parameter of the corresponding mode channel in the STATCOM controller to the optimal phase shift angle within the above-mentioned safe configuration range.

[0046] This method ensures from the design stage that the control parameters have positive damping characteristics under all preset operating modes, greatly improving the robustness and reliability of the STATCOM suppression strategy.

[0047] refer to Figure 4 As shown, the specific steps are as follows: (1) Determine the target and typical operation mode set Identify the target generator set and its critical shaft torsional vibration modes (denoted as mode i) that STATCOM needs to suppress. Based on power grid planning, operating procedures, and safety analysis, select a set of "typical operating modes" that ensure effective SSR suppression. This set should cover the main operating characteristics of the system, such as: a. Different switching states of a series capacitor compensator (fully switched, partially switched, fully switched off). b. Different operating modes of the outgoing lines (full connection, N-1, N-2, etc.); c. Different start-up combinations of generator units within and near the power plant.

[0048] (2) Obtain the effective range of single-mode positive damping phase shift angle For each typical operating mode selected in (1), the modal waveform envelope attenuation constant comparison calculation method is used to calculate and determine the effective range of phase shift angle that STATCOM can provide positive electrical damping for target mode i under electromagnetic transient simulation environment. , (where k represents the kth operating mode).

[0049] The proposed modal waveform envelope attenuation constant comparison method first establishes a detailed model including STATCOM and the target system in electromagnetic transient simulation software. A power grid fault is then simulated, and the phase shift angle parameters of mode i are considered. θi The simulation is performed within its defined domain (typically 0° to 360°) with a certain step size. For each simulation, the time-domain response waveform of the unit's shaft system modes after the fault is extracted, and the attenuation constant of its envelope is calculated. σ Plot the phase shift angle under this operating mode. θi - Attenuation constant σ "Relationship curve, will" σ >0 θi The continuous range is defined as the effective range of positive damping under this method. The simulation analysis steps are as follows: 1) Set the phase shift angle of the i-channel of the mode ; 2) Perform time-domain simulation and extract the modal i simulation waveform data several seconds after the fault; 3) Analyze the attenuation rate of the envelope on the i-mode waveform.

[0050] Repeating steps 1 through 3) yields the phase shift angle of the unit shaft system mode i under the system's operating conditions. With modal decay constant The relationship curve between the modal damping constant and the mode attenuation constant is shown. The modal damping includes three parts: modal mechanical damping, modal electrical damping without suppression measures under the system's operating mode, and modal electrical damping provided by STATCOM. The first two components are fixed. Therefore, this curve can intuitively describe the relationship between the phase shift angle of mode i and the electrical damping provided by STATCOM. Figure 5 As shown, the modal phase shift angle is configured in the range [-69, 101] degrees, and the total modal damping of this system mode is positive. The central angle of the range, 16 degrees, is the optimal modal phase shift angle for this system mode.

[0051] (3) Calculate the security configuration interval (intersection) under multiple modes. The effective range of positive damping corresponding to all typical operating modes obtained in step (2) , ... Perform intersection operations to obtain the common safety configuration range. : (11) This interval Any phase shift angle value within the range can guarantee that STATCOM provides positive damping for the target mode under all selected typical operating modes.

[0052] (4) Configure and verify parameters From the security configuration range A value is selected as the final configuration value of the phase shift angle θi for mode i, with the center value of this interval being preferred to maximize the damping margin under various modes. θi is then set in the corresponding modal damping control channel of the STATCOM controller. Finally, through time-domain simulation or field tests, it is verified that under various operating modes (especially the most demanding mode), the STATCOM with this parameter configuration can effectively suppress subsynchronous resonance after a fault, ensuring rapid decay of the unit's shaft torsional vibration.

[0053] The present invention proposes a method for configuring phase-shifting parameters of a STATCOM controller connected in parallel at the turbine generator terminal for suppressing SSR, which has the following significant advantages and technical effects: 1) Enhancing the robustness and adaptability of the suppression strategy: This invention overcomes the limitations of traditional methods that require parameter tuning under a single, fixed operating mode. By systematically analyzing various typical power grid operating modes (such as different series compensation switching, line connection, and start-up methods), and finding the common intersection of the positive damping phase shift angle intervals under each mode, a safe configuration interval is established. This ensures that the configured parameters can provide positive damping under all preset operating scenarios, fundamentally solving the risk of parameter failure due to changes in system mode, and greatly enhancing the reliability and wide adaptability of STATCOM in suppressing subsynchronous resonance.

[0054] 2) Providing a systematic and standardized parameter tuning process: The proposed "modal waveform envelope attenuation constant comparison method" combined with electromagnetic transient simulation provides a clear and repeatable engineering parameter tuning process from single-mode analysis to multi-mode synthesis. This method reduces excessive reliance on engineering experience, shifting the configuration of phase-shifting parameters from "empirical trial and error" to "systematic optimization," thus improving the scientific rigor and standardization of parameter tuning.

[0055] 3) Ensuring optimal shaft system safety and suppression: By optimizing the determined safety configuration range and the optimal phase shift angle, positive electrical damping can still be provided for the torsional vibration mode of the unit shaft system under the most demanding operating conditions, maximizing the damping margin. This ensures that the STATCOM device can effectively attenuate subsynchronous resonances under various potential operating conditions, avoiding shaft fatigue damage or even catastrophic failures caused by suppression failure or negative damping, providing key technical support for the safe and stable operation of power generation equipment and the power grid.

[0056] 4) Possesses clear engineering practical value and verifiability: This method is implemented based on a mature electromagnetic transient simulation platform, with clear steps and intuitive results (visually displayed through the "phase shift angle-attenuation constant" curve and interval intersection). The final configured parameters can be validated for effectiveness under different conditions through time-domain simulation, meeting the engineering practice requirements for power system safety and stability control, and is easy to apply and promote in the design, commissioning, and operation and maintenance phases of engineering projects.

[0057] In a specific embodiment of the present invention, a domestic 6-unit series compensation power transmission system is as follows: Figure 6 As shown. Power plant C has an installed capacity of 2×350MW, connected to power plant B via a single 30km, 500kV line; power plant B has an installed capacity of 2×350MW, connected to power plant A via two 46km, 500kV lines; power plant A has an installed capacity of 2×500MW, connected to the system via two 128+145km, 500kV lines. These two lines are equipped with series capacitors with a compensation ratio of 35%.

[0058] The shaft system modal frequencies of Unit A in Power Plant are 17.42Hz (Mode 1), 28.94Hz (Mode 2), and 34.68Hz (Mode 3). Analysis shows that the SSR of Unit A is unstable under both the two-circuit supplementary operation mode and the one-circuit supplementary operation mode of the two-circuit lines in the Power Plant A-system.

[0059] Analysis showed that the units in this transmission system did not have transient torque amplification issues; the main problem was the unstable interaction between electromechanical torsional vibration. Therefore, a 30 Mvar STATCOM device was installed at the generator terminal of Unit A to suppress SSR (Strain-Side Ripple) of the unit.

[0060] Establish Figure 6The electromagnetic transient simulation model of the system shown is divided into four modes based on the operating status of the series compensation line between power plant A and the system: 2-line 0-series compensation, 2-line 2-series compensation, 2-line 1-series compensation, and 1-line 1-series compensation. Each mode considers different start-up conditions of power plants A, B, and C, totaling 18 operating conditions. The phase shift angle range of mode 2 positive damping is analyzed sequentially. The phase shift angle corresponding to each of the 18 operating conditions under each mode is calculated. θi - Attenuation constant σ "Relationship curves, and superimpose 18 curves, such as..." Figures 7a-7d As shown. The curves... σ >0 θi The intersection interval is determined as the effective range of positive damping under this method.

[0061] Depend on Figure 7a It can be seen that, in the non-series compensation operation mode of the two circuits of the A-system of the power plant, when the 1-6 units are started at different times, the phase shift angle range of the positive damping mode 2 of the A-system of the power plant basically overlaps in the range of [-69, 100] degrees. Figure 7b It can be seen that, under the two-circuit two-series-compensation operation mode, the phase shift angle intersection range of mode 2 positive damping at different start-up times is [-79, 47] degrees; Figure 7c It can be seen that the phase shift angle intersection range of the mode 2 positive damping under the 1 series compensation operation mode of the 2-circuit line is [-73, 84] degrees; Figure 7d It can be seen that under different start-up operation modes of a single-circuit line with one series compensation, the intersection range of the phase shift angle for mode 2 with positive damping is only [-67, -22] degrees. The phase shift angle range of the single-circuit line with one series compensation mode is also the intersection range of the four modes. Therefore, the phase shift angle of mode 2 must be configured within the range of [-67, -22] degrees to ensure the stability of the unit's SSR under the four modes. The corresponding optimal phase shift angle can be taken as the center value of the intersection range, which is -44.5 degrees.

[0062] In addition, the STATCOM controller is connected to the terminal such as Figure 8 As shown, by measuring the change in the number of teeth on the speed measuring gears at both ends of the generator shaft (the number of teeth on the speed measuring gears ranges from 60 to 200), the speed sensor outputs a kilohertz square wave signal characterizing the instantaneous speed of the generator shaft. This signal is filtered and separated into multi-mode signals of the shaft in the STATCOM controller at the generator end. The STATCOM modulates the shaft mode signals and injects a current "complementary" to the mode frequency into the generator end. Part of this current is shunted to the system side, and the remainder flows into the stator winding of the synchronous generator, generating electromagnetic torque at the mode frequency. A suitable torque phase can significantly improve the electrical damping level of the shaft mode.

[0063] Therefore, this invention, based on an electromagnetic transient simulation platform, establishes refined unit and grid models to systematically identify effective suppression intervals under different system structures and operating modes, thereby achieving precise damping control of subsynchronous resonance. This invention primarily addresses the shortcomings of existing parameter tuning methods, such as insufficient adaptability to changes in system operating conditions, reliance on experience, and lack of systematic multi-scenario verification. It improves the effectiveness and reliability of STATCOM controllers in real, complex power systems, providing technical support for the safe and stable operation of units and the power grid.

[0064] Exemplary device Figure 9 This is a schematic diagram of a phase-shift parameter configuration device for suppressing subsynchronous resonance in a STATCOM controller provided by an exemplary embodiment of the present invention. Figure 9 As shown, the device 900 includes: Module 910 is used to determine the target generator set, its target torsional vibration mode, and typical operating mode that the STATCOM controller needs to suppress. Calculation module 920 is used to calculate the effective range of the phase shift angle that the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method. The calculation module 930 is used to perform intersection calculations on the effective intervals of the phase shift angles of all typical operating modes to obtain a common safety configuration interval; Configuration module 940 is used to select phase shift angle values ​​from the safe configuration range and configure them into the damping control channel of the corresponding critical shaft torsional vibration mode in the STATCOM controller.

[0065] Optionally, the typical operating mode set includes: different switching states of series capacitor compensators, different operating modes of transmission lines, and different start-up combinations of generator units within and near the power plant.

[0066] Optionally, the modal waveform envelope attenuation constant comparison method in calculation module 920 specifically includes: In the electromagnetic transient simulation model, the phase shift angle parameter of the target torsional vibration mode is scanned within its domain with a preset step size. For each phase shift angle value of the scan, time-domain simulation is performed to obtain the time-domain response waveform of the target torsional vibration mode of the unit shaft system after the fault. Calculate the attenuation constant of the envelope of the time-domain response waveform; Based on the attenuation constants corresponding to all scan phase shift angle values, a phase shift angle-attenuation constant relationship curve is plotted, and the continuous range of phase shift angles corresponding to attenuation constants greater than zero is determined as the effective range of phase shift angles under this typical operating mode.

[0067] Optionally, the domain of the phase shift angle parameter is 0° to 360°.

[0068] Optionally, when selecting the final phase shift angle configuration value from the safety configuration range, the center value of the safety configuration range should be selected first.

[0069] Optionally, the device 900 further includes a verification module for verifying, based on the configured phase shift angle value, the STATCOM controller under multiple operating modes in a typical operating mode set to confirm that it can effectively suppress subsynchronous resonance.

[0070] Exemplary electronic devices Figure 10 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 10 As shown, the electronic device 100 includes one or more processors 101 and memory 102.

[0071] The processor 101 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0072] The memory 102 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 101 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 103 and an output device 104, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0073] In addition, the input device 103 may also include, for example, a keyboard, a mouse, etc.

[0074] The output device 104 can output various information to the outside. The output device 104 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0075] Of course, for the sake of simplicity, Figure 10Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0076] Exemplary computer program products and computer-readable storage media In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0077] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0078] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0079] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0080] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0082] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0083] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0084] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0085] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for configuring phase-shifting parameters of a STATCOM controller for suppressing subsynchronous resonance, characterized in that, include: Determine the target generator set, its target torsional vibration mode, and typical operating mode that the STATCOM controller needs to suppress; For each typical operating mode in the set of typical operating modes, the effective range of the phase shift angle that the STATCOM controller can provide positive electrical damping for the target torsional vibration mode is calculated in the electromagnetic transient simulation using the modal waveform envelope attenuation constant comparison method. By performing an intersection operation on the effective intervals of the phase shift angle for all the typical operating modes, a common safety configuration interval is obtained; Select a phase shift angle value from the safety configuration range and configure it into the damping control channel of the STATCOM controller corresponding to the torsional vibration mode of the key shaft system.

2. The method according to claim 1, characterized in that, The typical operating mode set includes: different switching states of series capacitor compensators, different operating modes of transmission lines, and different start-up combinations of generator units in and near the power plant.

3. The method according to claim 1, characterized in that, The modal waveform envelope attenuation constant comparison method specifically includes: In the electromagnetic transient simulation model, the phase shift angle parameter of the target torsional vibration mode is scanned within its domain with a preset step size. For each phase shift angle value of the scan, time-domain simulation is performed to obtain the time-domain response waveform of the target torsional vibration mode of the unit shaft system after the fault. Calculate the attenuation constant of the envelope of the time-domain response waveform; Based on the attenuation constants corresponding to all scan phase shift angle values, a phase shift angle-attenuation constant relationship curve is plotted, and the continuous range of phase shift angles corresponding to attenuation constants greater than zero is determined as the effective range of phase shift angles under this typical operating mode.

4. The method according to claim 3, characterized in that, The defined range of the phase shift angle parameter is 0° to 360°.

5. The method according to claim 1, characterized in that, When selecting the final phase shift angle configuration value from the safety configuration range, the center value of the safety configuration range shall be selected first.

6. The method according to claim 1, characterized in that, Also includes: Based on the configured phase shift angle value, the STATCOM controller was verified under various operating modes in the set of typical operating modes, confirming that it can effectively suppress subsynchronous resonance.

7. A STATCOM controller phase-shift parameter configuration device for suppressing subsynchronous resonance, characterized in that, include: The determination module is used to determine the target generator set, its target torsional vibration mode, and typical operating mode that the STATCOM controller needs to suppress. The calculation module is used to calculate the effective range of the phase shift angle that the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method. The calculation module is used to perform an intersection operation on the effective intervals of the phase shift angle of all the typical operating modes to obtain a common safety configuration interval; The configuration module is used to select a phase shift angle value from the safety configuration range and configure it into the damping control channel of the STATCOM controller corresponding to the torsional vibration mode of the key shaft system.

8. The apparatus according to claim 7, characterized in that, The typical operating mode set includes: different switching states of series capacitor compensators, different operating modes of transmission lines, and different start-up combinations of generator units in and near the power plant.

9. The apparatus according to claim 7, characterized in that, The modal waveform envelope attenuation constant comparison method described in the calculation module specifically includes: In the electromagnetic transient simulation model, the phase shift angle parameter of the target torsional vibration mode is scanned within its domain with a preset step size. For each phase shift angle value of the scan, time-domain simulation is performed to obtain the time-domain response waveform of the target torsional vibration mode of the unit shaft system after the fault. Calculate the attenuation constant of the envelope of the time-domain response waveform; Based on the attenuation constants corresponding to all scan phase shift angle values, a phase shift angle-attenuation constant relationship curve is plotted, and the continuous range of phase shift angles corresponding to attenuation constants greater than zero is determined as the effective range of phase shift angles under this typical operating mode.

10. The apparatus according to claim 9, characterized in that, The defined range of the phase shift angle parameter is 0° to 360°.

11. The apparatus according to claim 7, characterized in that, When selecting the final phase shift angle configuration value from the safety configuration range, the center value of the safety configuration range shall be selected first.

12. The apparatus according to claim 7, characterized in that, Also includes: The verification module is used to verify, based on the configured phase shift angle value, under multiple operating modes in the set of typical operating modes, to confirm that the STATCOM controller can effectively suppress subsynchronous resonance.

13. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-6.

14. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-6.

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