STATCOM controller DQ link parameter configuration method for suppressing subsynchronous resonance

Abstract

The invention discloses a STATCOM (Static Synchronous Compensator) controller DQ link parameter configuration method for suppressing subsynchronous resonance, which comprises the following steps of: establishing a target unit and an electromagnetic transient simulation model of a power grid in which the target unit is located in electromagnetic transient software, and defining a series of representative system operation modes covering various power grid operation scenes; for each target suppression mode, in each system operation mode, executing open-loop excitation mode damping effect scanning to obtain a relation curve between the oscillation amplitude of the target suppression mode and the DQ rotation deviation angle in each system operation mode; obtaining a group of local optimal DQ rotation deviation angles of each target suppression mode i corresponding to different system operation modes; and performing statistical analysis on each group of local optimal DQ rotation deviation angles, and selecting a robust common angle as a final fixed configuration parameter of the target suppression mode.

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 the parameters of the DQ link 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 to the turbine generator terminals serves as an effective means of oscillation suppression. By injecting additional control signals into the generator excitation system, it can effectively enhance the system's damping effect on subsynchronous / supersynchronous oscillations. Its 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 DQ stage are particularly critical, directly affecting the controller's compensation for specific oscillation modes. Parameters that are too large or too small will not achieve the suppression effect. Therefore, the calculation of the DQ stage parameters determines the accuracy and effectiveness of the suppression effect, playing a crucial role in ensuring the stable operation of thermal power units and the power system.

[0004] Existing research suggests that the close electrical distance between the STATCOM at the generator terminal and the synchronous machine minimizes the impact of changes in system operating modes on its damping control characteristics, resulting in broad adaptability of the configured control parameters. Therefore, existing parameter tuning processes are typically 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, its operating mode influenced by multiple factors including power source distribution, network topology, load levels, and the status of compensation equipment. Any significant change in these factors can reshape the impedance frequency characteristics of the power grid, affecting the ideal phase compensation angle required for the suppression loop, thus exposing the potential failure risk of parameter strategies based on a single fixed point. Recently, in a practical project, even after configuring a STATCOM with sufficient capacity at the generator terminal, sustained large-amplitude torsional vibrations were observed in the unit's shaft system under certain operating modes, indicating weak or ineffective subsynchronous resonance damping control of the STATCOM, and that its control parameters were not adaptable to multiple system operating modes. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for configuring the parameters of the DQ stage of a STATCOM controller for suppressing subsynchronous resonance.

[0006] According to one aspect of the present invention, a method for configuring the DQ element parameters of a STATCOM controller for suppressing subsynchronous resonance is provided, comprising: An electromagnetic transient simulation model of the target unit and its power grid is established in the electromagnetic transient software, and a series of representative system operation modes covering various power grid operation scenarios are defined in the electromagnetic transient simulation model. For each target suppression mode of the shaft system of the target unit, under each system operation mode, an open-loop excitation mode damping effect scan is performed to obtain the oscillation amplitude of the shaft mode of each target suppression mode under different DQ rotation offset angles, and obtain the relationship curve between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode. Based on the relationship curve, the DQ rotation offset angle that maximizes the oscillation amplitude of the target suppression mode is selected as the local optimal DQ rotation offset angle of the target suppression mode under the current system operation mode. By traversing all system operating modes, a set of locally optimal DQ rotation offset angles corresponding to different system operating modes is obtained for each target suppression mode i; Statistical analysis was performed on each group of locally optimal DQ rotation offset angles, and a robust common angle was selected as the final fixed configuration parameter for the target suppression mode.

[0007] Optionally, it also includes: co-optimizing the mode gain and phase shift angle in the same control channel based on the final fixed configuration parameters of each target suppressed mode.

[0008] Optionally, the electromagnetic transient simulation model includes a detailed shaft system model, a STATCOM device, a power transmission network, and a series compensation device.

[0009] Optionally, the system operation mode includes one or more combinations of different network topologies, series compensation switching status, load levels, and power generation output combinations.

[0010] Optionally, for each target suppression mode of the target unit's shaft system, under each system operating mode, an open-loop excitation mode damping effect scan is performed to obtain the oscillation amplitude of the shaft system modes of each target suppression mode at different DQ rotation offset angles, including: Step 1: In the electromagnetic transient simulation model, disconnect the closed-loop feedback signal of the control channel for mode i in the STATCOM controller; Step 2: Inject a sinusoidal excitation signal with the frequency of mode i into the open loop of the control channel for the target suppression mode i; Step 3: Set the DQ rotation offset angle of the target suppression mode in the STATCOM controller to an initial value; Step 4: Perform electromagnetic transient simulation. After the system response reaches steady state, extract the shaft speed signal of the target unit. Step 5: Extract the oscillation amplitude of the target suppression mode i from the shaft rotation speed signal; Step 6: Within the range of 0° to 360°, change the value of the DQ rotation offset angle with a preset step size, and repeat steps 4 and 5 to obtain the curve showing the relationship between the oscillation amplitude of the target suppression mode i and the DQ rotation offset angle under the current system operation mode.

[0011] Optionally, statistical analysis is performed on each group of locally optimal DQ rotation offset angles, and a robust common angle is selected as the final fixed configuration parameter for the target suppression mode, including: Calculate the central trend of the phase distribution of each group of local optimal DQ rotation offset angles, and select the local optimal rotation offset angle that can provide close to the preset optimal damping effect under most or critical system operating modes as the robust common angle; The robust common angle is used as the final fixed configuration parameter for the target suppression mode.

[0012] Optionally, the modal gain is set per unit based on damping requirements and STATCOM device capacity; the phase shift angle is finely adjusted based on robust common angle and the system's inherent phase frequency characteristics to compensate for additional phase shift during signal transmission.

[0013] According to another aspect of the present invention, a parameter configuration device for the DQ element of a STATCOM controller for suppressing subsynchronous resonance is provided, comprising: The definition module is used to establish electromagnetic transient simulation models of the target unit and its power grid in the electromagnetic transient software, and to define a series of representative system operation modes covering various power grid operation scenarios in the electromagnetic transient simulation model; The acquisition module is used to perform open-loop excitation mode damping effect scanning for each target suppression mode of the shaft system of the target unit under each system operation mode, to obtain the oscillation amplitude of the shaft mode of each target suppression mode under different DQ rotation offset angles, and to obtain the relationship curve between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode. The first selection module is used to select the DQ rotation offset angle that maximizes the oscillation amplitude of the target suppression mode based on the relationship curve, as the local optimal DQ rotation offset angle of the target suppression mode under the current system operation mode. The traversal module is used to traverse all system operating modes and obtain a set of locally optimal DQ rotation offset angles for each target suppression mode i corresponding to different system operating modes; The second selection module is used to perform statistical analysis on each group of locally optimal DQ rotation offset angles and select a robust common angle as the final fixed configuration parameter for the target suppression mode.

[0014] 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 method of any of the above aspects of the present invention.

[0015] 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.

[0016] Therefore, this invention proposes a parameter configuration method for the DQ stage of a STATCOM controller connected in parallel to a steam turbine generator terminal, applicable to multiple operating conditions. Based on an electromagnetic transient simulation platform, this method establishes a refined model of the generator unit and power grid. Under different system structures and operating modes, it systematically identifies the optimal DQ deflection angle using a combination of open-loop excitation and frequency domain analysis, thereby achieving precise damping control of subsynchronous oscillations. This invention 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 damping controllers in real, complex power systems, providing technical support for the safe and stable operation of generator units and the power grid. Attached Figure Description

[0017] 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 parameters of the DQ stage 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 the modal DQ rotation offset angle and electromagnetic torque amplitude curve provided by an exemplary embodiment of the present invention; Figure 4 This is a schematic diagram of a calculation flowchart provided in an exemplary embodiment of the present invention; Figure 5 This is a schematic diagram of a 6-machine serial transmission system provided in an exemplary embodiment of the present invention; Figure 6 This is a schematic diagram of the DQ rotation angle scan curve of power plant unit A mode provided in an exemplary embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a STATCOM controller DQ link parameter configuration device for suppressing subsynchronous resonance provided in an exemplary embodiment of the present invention; Figure 8 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Exemplary methods Figure 1 This is a schematic flowchart illustrating a method for configuring the DQ stage 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 parameter configuration method 100 for the DQ element of the STATCOM controller used to suppress subsynchronous resonance includes the following steps: Step 101: Establish an electromagnetic transient simulation model of the target unit and its power grid in the electromagnetic transient software, and define a series of representative system operation modes covering various power grid operation scenarios in the electromagnetic transient simulation model; Step 102: For each target suppression mode of the shaft system of the target unit, perform an open-loop excitation mode damping effect scan under each system operation mode to obtain the oscillation amplitude of the shaft mode of each target suppression mode under different DQ rotation offset angles, and obtain the relationship curve between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode. Step 103: Based on the relationship curve, select the DQ rotation offset angle that maximizes the oscillation amplitude of the target suppression mode as the local optimal DQ rotation offset angle of the target suppression mode under the current system operation mode; Step 104: Traverse all system operation modes to obtain a set of locally optimal DQ rotation offset angles for each target suppression mode i corresponding to different system operation modes; Step 105: Perform statistical analysis on each group of locally optimal DQ rotation offset angles, and select a robust common angle as the final fixed configuration parameter for the target suppression mode.

[0032] Specifically, addressing the technical problems existing in the background art, this invention proposes a parameter configuration method for the DQ link of a STATCOM controller connected in parallel at the turbine generator terminal under multiple operating conditions. This method, based on an electromagnetic transient simulation platform, establishes a refined unit and grid model. Under different system structures and operating modes, it systematically identifies the optimal DQ deflection angle using a combination of open-loop excitation and frequency domain analysis, thereby achieving precise damping control of subsynchronous oscillations. 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 damping controllers in real complex power systems, providing technical support for the safe and stable operation of units and the grid. The specific implementation scheme is as follows: 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 DQ transformation / DQ rotation offset angle stages. 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.

[0033] 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. After mode i gain and phase shifting, the output is: (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 a 3-phase secondary / supersynchronous frequency current, where the phase a current is: (3) In the formula: , These are the secondary / supersynchronous frequency currents of the complementary frequency of mode i, respectively. The STATCOM outputs a secondary / supersynchronous frequency current of equal amplitude injected into the machine terminal. 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 are the stator terminal voltage amplitude and the DQ axis voltage, respectively. , These are the magnetic flux linkages on the DQ axis, 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 mode i electrical damping provided by STATCOM is: (10) It can be seen that configuring the appropriate 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.

[0034] The secondary / supersynchronous frequency currents in the stator of the generator unit respectively generate electromagnetic torque components at modal frequencies. and After DQ rotation offset angle Adjustments are made to ensure that the angle between the two torque vectors is less than 90 degrees, so that the magnitude of the synthesized torque vector is greater than that of the secondary / supersynchronous torque vector, thereby enhancing the modal damping control effect.

[0035] From equation (9), we can obtain that under a given system operating mode, the diversion coefficient is... , and additional phase shift , Unchanged, and gain The total electromagnetic torque amplitude generated by the STATCOM output current remains unchanged. Rotation offset angle by DQ Confirmed. Due to For inclusion The quadratic relationship of trigonometric functions, therefore, as Figure 3 As shown, When varying within the range of 0 to 360 degrees It reached its maximum value twice.

[0036] In practical systems, the accuracy of component models and parameter deviations affect the transmission characteristics of subsynchronous / supersynchronous frequencies. Therefore, in practical systems, analytical methods are not directly used to determine the system's modal damping control parameters. Instead, open-loop excitation tests are typically used to configure the DQ rotation offset angle in the modal control channel of the STATCOM controller. .

[0037] As shown in equation (9), changing the rotational offset angle of mode DQ in the controller causes a phase change in the current flowing into the stator winding at the secondary / supersynchronous frequency that is complementary to the mode frequency. Consequently, the amplitude of the electromagnetic torque synthesized by these two currents changes accordingly. Since electromagnetic torque is not a directly measurable quantity, and a larger amplitude mode frequency torque can excite a larger amplitude mode torsional vibration, a larger deviation in the shaft speed occurs.

[0038] Therefore, in actual systems, the unit shaft speed signal is used as the basis for analysis. The offset angle set in this way may fail when the system operation mode changes (such as series compensation activation, line activation / deactivation, or changes in start-up mode) due to changes in the equivalent impedance characteristics of the power grid. This could lead to the failure of the originally set angle, causing STATCOM suppression to fail or even exacerbating oscillations.

[0039] Based on this, the present invention provides a systematic method for configuring the DQ link parameters of a STATCOM controller connected in parallel at the turbine generator terminal, adaptable to multiple operating conditions. This addresses the problems of existing technologies where parameter tuning relies on experience, lacks multi-scenario verification, and is difficult to adapt to changes in system operating modes. The present invention dynamically identifies the DQ rotation offset angle corresponding to each oscillation mode by combining electromagnetic transient simulation and open-loop excitation experiments, thereby ensuring that the STATCOM can provide optimal subsynchronous resonance damping under different system structures and operating conditions. Figure 4 As shown, the specific calculation scheme is as follows: (1) Parameter optimization framework under multiple operating conditions For the target generating unit and its power grid, an electromagnetic transient simulation model is established in the electromagnetic transient software, including a detailed shaft system model, a STATCOM device, a transmission network, and series compensation equipment. A series of representative system operating modes (such as different network topologies, series compensation switching states, load levels, and generation output combinations) are defined to cover various operating scenarios that may occur in the power grid.

[0040] (2) Modal damping effect scanning based on open-loop excitation For each target suppression mode i (frequency i) of the unit shaft system In each predefined operating mode, perform the following steps: 1): In the simulation model, disconnect the closed-loop feedback signal of the i-th mode control channel of STATCOM (i.e., the unit shaft speed deviation). ).

[0041] 2) Inject a small amplitude, frequency of [value missing] into the open loop of the modal control channel. Continuous sinusoidal excitation signal .

[0042] 3) Set the DQ rotation offset angle for this mode in the STATCOM controller. Use an initial value (e.g., 0°).

[0043] 4) Perform electromagnetic transient simulation. After the system response reaches steady state, extract the rotational speed signal of the unit's shaft system.

[0044] 5) Extract the oscillation amplitude of mode i from the shaft rotation speed signal through filtering or spectrum analysis. .

[0045] 6) Change within the range of 0° to 360° in steps of a certain size (e.g., 10°). Repeat steps 4) and 5) to obtain the value under this operating mode. With modal oscillation amplitude The corresponding relationship curve, such as Figure 2 As shown.

[0046] (3) Identification and selection of the optimal DQ rotation offset angle The results obtained in step (2) of the analysis Relationship curve. The magnitude of the combined electromagnetic torque generated by the injected current from the STATCOM varies with... The curve will exhibit two maxima due to periodic changes. The selection of the modal oscillation amplitude... The largest The angle value serves as the locally optimal DQ rotation offset angle for this mode under the current operating conditions. The principle is that, under open-loop excitation, when the interaction between the damping torque generated by the STATCOM and the shaft system modal motion reaches its strongest, it will excite the maximum shaft system modal amplitude. This state corresponds to the STATCOM's potential maximum positive damping capability.

[0047] (4) Multi-scenario parameter integration and robust configuration Iterate through all predefined system operating modes and obtain a set of locally optimal angles corresponding to different modes for each mode i. Statistical analysis is performed on the local optimal angles under all operating conditions to calculate the central trend of their phase distribution. A "robust common angle" that provides near-optimal damping effect under most or critical operating conditions is selected as the final fixed configuration parameter for this mode. This method enhances the adaptability of the parameters to changes in operating conditions.

[0048] (5) Co-tuning with other control parameters Determining the DQ rotation offset angle Subsequently, the modal gain Ki and phase shift angle in the same control channel can be further optimized. i. Gain Ki can be set per unit according to damping requirements and equipment capacity; Phase shift angle i can be based on Fine-tuning is performed on the inherent phase frequency characteristics of the system to compensate for additional phase shifts during signal transmission, ensuring that the injected current generates a phase-accurate damping torque in the synchronous machine rotor coordinate system.

[0049] In a specific embodiment of the present invention, a domestic 6-unit series compensation power transmission system is as follows: Figure 5 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%.

[0050] 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.

[0051] 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.

[0052] Establish Figure 5 The electromagnetic transient simulation model of the system shown is used in the power plant A-system 2 circuit without series compensation operation mode. By applying an open-loop constant amplitude continuous modal frequency excitation signal, three mode DQ rotational offset angles are set respectively, and the amplitudes of mode 1, mode 2 and mode 3 in the shaft speed deviation are analyzed.

[0053] like Figure 6 As shown, the DQ rotation angles of the three modes vary within the range of 0-360 degrees, and the amplitudes of the shaft system modes reach their maximum values ​​at 100 degrees and 280 degrees, respectively. In the actual system, under the condition of no series compensation operation on the second circuit of the A-system of the power plant, an open-loop injection excitation signal test determined that the DQ rotation offset angles of modes 1, 2, and 3 are within the range of 280-300 degrees, and the amplitudes of the corresponding shaft system modes reach their maximum values. The simulation analysis is consistent with the experimental results of the actual system.

[0054] Statistical analysis was performed on the local optimal angles under all operating modes to calculate the central trend of their phase distribution. The DQ rotation offset angles of modes 1, 2 and 3 are all in the range of 280-300 degrees. 280 degrees can be selected as the "robust common angle" with the best damping effect, and the final fixed configuration parameters can be set.

[0055] The present invention proposes a method for configuring the DQ element parameters of a STATCOM controller to suppress subsynchronous resonance, which has the following significant advantages and beneficial effects: (1) Solved the problem of poor adaptability of existing parameter tuning methods: This invention abandons the traditional fixed parameter tuning method that relies on a single operating condition or experience, and proposes a systematic multi-scenario parameter configuration process. By performing simulation scanning and parameter identification on a series of representative operating modes, it effectively solves the key problem that the parameters of the STATCOM damping controller fail or deteriorate due to changes in the power grid operating mode, and significantly improves the adaptability and robustness of the controller in complex and dynamically changing power grids.

[0056] (2) Precision and optimization of parameter tuning are achieved: Based on the electromagnetic transient simulation platform, the method of combining open-loop excitation and amplitude response analysis can intuitively and accurately identify the DQ rotational offset angle that maximizes the potential damping capacity of STATCOM. Starting from the damping mechanism, this method directly uses the amplitude of shaft system modal oscillation as the evaluation index, ensuring that the configured parameters can generate the strongest positive damping effect under specific operating conditions, thereby achieving precise and efficient suppression of subsynchronous resonance.

[0057] (3) Improved the systematicness and scientific nature of engineering implementation: It provides a complete and operable technical solution from model establishment, working condition definition, simulation scanning to parameter selection and integration. The method has clear steps and relies on mature electromagnetic transient simulation tools, which makes it easy for engineering technicians to understand and implement. It transforms the parameter tuning process from "experience-dependent" to "data-driven", which greatly improves the standardization and scientific nature of engineering implementation.

[0058] (4) Enhanced overall reliability of the damping control system: The "robust common angle" configuration strategy obtained through multi-scenario analysis provides a reliable data foundation for adaptive configuration, ensuring that STATCOM can provide effective and near-optimal damping in most or critical operating modes. This reduces the risk of control failure or even aggravated oscillations due to parameter mismatch, providing a more reliable technical guarantee for the safety of generator shaft system and stable operation of the power grid.

[0059] (5) It has good scalability and comprehensive benefits: This method is not only applicable to the optimization of the DQ rotation offset angle, but its framework can also be extended to the coordinated tuning of other parameters such as control gain and phase shift angle. Through a systematic simulation analysis, a complete set of parameters suitable for multiple operating conditions can be obtained for the STATCOM damping controller, saving the cost and time of repeated testing and adjustment in the later stage, and has good technical and economic benefits and promotion and application value.

[0060] Exemplary device Figure 7 This is a schematic diagram of the structure of a STATCOM controller DQ element parameter configuration device for suppressing subsynchronous resonance provided in an exemplary embodiment of the present invention. Figure 7 As shown, the device 700 includes: The definition module 710 is used to establish an electromagnetic transient simulation model of the target unit and its power grid in the electromagnetic transient software, and to define a series of representative system operation modes covering multiple power grid operation scenarios in the electromagnetic transient simulation model; The acquisition module 720 is used to perform open-loop excitation mode damping effect scanning for each target suppression mode of the shaft system of the target unit under each system operation mode, to obtain the oscillation amplitude of the shaft mode of each target suppression mode under different DQ rotation offset angles, and to obtain the relationship curve between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode. The first selection module 730 is used to select, based on the relationship curve, the DQ rotation offset angle that maximizes the oscillation amplitude of the target suppression mode as the local optimal DQ rotation offset angle of the target suppression mode under the current system operation mode; Traversal module 740 is used to traverse all system operating modes and obtain a set of locally optimal DQ rotation offset angles for each target suppression mode i corresponding to different system operating modes; The second selection module 750 is used to perform statistical analysis on each group of locally optimal DQ rotation offset angles and select a robust common angle as the final fixed configuration parameter for the target suppression mode.

[0061] Optionally, the device 700 further includes an optimization module for collaboratively optimizing the mode gain and phase shift angle in the same control channel based on the final fixed configuration parameters of each target suppression mode.

[0062] Optionally, the electromagnetic transient simulation model includes a detailed shaft system model, a STATCOM device, a power transmission network, and a series compensation device.

[0063] Optionally, the system operation mode includes one or more combinations of different network topologies, series compensation switching status, load levels, and power generation output combinations.

[0064] Optionally, module 720 includes: Step 1: In the electromagnetic transient simulation model, disconnect the closed-loop feedback signal of the control channel for mode i in the STATCOM controller; Step 2: Inject a sinusoidal excitation signal with the frequency of mode i into the open loop of the control channel for the target suppression mode i; Step 3: Set the DQ rotation offset angle of the target suppression mode in the STATCOM controller to an initial value; Step 4: Perform electromagnetic transient simulation. After the system response reaches steady state, extract the shaft speed signal of the target unit. Step 5: Extract the oscillation amplitude of the target suppression mode i from the shaft rotation speed signal; Step 6: Within the range of 0° to 360°, change the value of the DQ rotation offset angle with a preset step size, and repeat steps 4 and 5 to obtain the curve showing the relationship between the oscillation amplitude of the target suppression mode i and the DQ rotation offset angle under the current system operation mode.

[0065] Optionally, the second selection module 750 includes: Calculate the central trend of the phase distribution of each group of local optimal DQ rotation offset angles, and select the local optimal rotation offset angle that can provide close to the preset optimal damping effect under most or critical system operating modes as the robust common angle; The robust common angle is used as the final fixed configuration parameter for the target suppression mode.

[0066] Optionally, the modal gain is set per unit based on damping requirements and STATCOM device capacity; the phase shift angle is finely adjusted based on robust common angle and the system's inherent phase frequency characteristics to compensate for additional phase shift during signal transmission.

[0067] Exemplary electronic devices Figure 8 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 8 As shown, the electronic device 80 includes one or more processors 81 and memory 82.

[0068] The processor 81 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.

[0069] The memory 82 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 81 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 83 and an output device 84, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0070] In addition, the input device 83 may also include, for example, a keyboard, a mouse, etc.

[0071] The output device 84 can output various information to the outside. The output device 84 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0072] Of course, for the sake of simplicity, Figure 8 Only 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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 the parameters of the DQ element of a STATCOM controller for suppressing subsynchronous resonance, characterized in that, include: An electromagnetic transient simulation model of the target unit and its power grid is established in the electromagnetic transient software, and a series of representative system operation modes covering multiple power grid operation scenarios are defined in the electromagnetic transient simulation model. For each target suppression mode of the shaft system of the target unit, under each system operation mode, an open-loop excitation mode damping effect scan is performed to obtain the oscillation amplitude of the shaft mode of each target suppression mode under different DQ rotation offset angles, and to obtain the relationship curve between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode. Based on the relationship curve, the DQ rotation offset angle that maximizes the oscillation amplitude of the target suppression mode is selected as the local optimal DQ rotation offset angle of the target suppression mode under the current system operation mode. By traversing all system operating modes, a set of locally optimal DQ rotation offset angles corresponding to different system operating modes is obtained for each target suppression mode i; Statistical analysis was performed on each group of locally optimal DQ rotation offset angles, and a robust common angle was selected as the final fixed configuration parameter for the target suppression mode.

2. The method according to claim 1, characterized in that, Also includes: Based on the final fixed configuration parameters of each target suppression mode, the mode gain and phase shift angle in the same control channel are collaboratively optimized.

3. The method according to claim 1, characterized in that, The electromagnetic transient simulation model includes a detailed shaft system model, a STATCOM device, a power transmission network, and a series compensation device.

4. The method according to claim 1, characterized in that, The system operation modes include one or more combinations of different network topologies, series compensation switching states, load levels, and power generation output combinations.

5. The parameter configuration method according to claim 1, characterized in that, The relationship curves between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode are obtained, including: Step 1: In the electromagnetic transient simulation model, disconnect the closed-loop feedback signal of the control channel for mode i in the STATCOM controller; Step 2: Inject a sinusoidal excitation signal with the frequency of mode i into the open loop of the control channel for the target suppression mode i; Step 3: Set the DQ rotation offset angle of the target suppression mode in the STATCOM controller to an initial value; Step 4: Perform electromagnetic transient simulation. After the system response reaches steady state, extract the shaft speed signal of the target unit. Step 5: Extract the oscillation amplitude of the target suppression mode i from the shaft rotation speed signal; Step 6: Within the range of 0° to 360°, change the value of the DQ rotation offset angle with a preset step size, and repeat steps 4 and 5 to obtain the curve showing the relationship between the oscillation amplitude of the target suppression mode i and the DQ rotation offset angle under the current system operation mode.

6. The method according to claim 1, characterized in that, Statistical analysis was performed on each group of locally optimal DQ rotation offset angles, and a robust common angle was selected as the final fixed configuration parameter for the target suppression mode, including: Calculate the central trend of the phase distribution of each group of local optimal DQ rotation offset angles, and select the local optimal rotation offset angle that can provide close to the preset optimal damping effect under most or critical system operating modes as the robust common angle; The robust common angle is used as the final fixed configuration parameter for the target suppression mode.

7. The method according to claim 2, characterized in that, The modal gain is set per unit based on damping requirements and STATCOM device capacity; the phase shift angle is finely adjusted based on the robust common angle and the inherent phase frequency characteristics of the system to compensate for additional phase shift during signal transmission.

8. A parameter configuration device for the DQ stage of a STATCOM controller for suppressing subsynchronous resonance, used to implement the method according to any one of claims 1-7, characterized in that, include: The definition module is used to establish an electromagnetic transient simulation model of the target unit and its power grid in the electromagnetic transient software, and to define a series of representative system operation modes covering multiple power grid operation scenarios in the electromagnetic transient simulation model; The acquisition module is used to perform an open-loop excitation mode damping effect scan for each target suppression mode of the shaft system of the target unit under each system operation mode, to obtain the oscillation amplitude of the shaft mode of each target suppression mode under different DQ rotation offset angles, and to obtain the relationship curve between the oscillation amplitude of the target suppression mode and the DQ rotation offset angle under each system operation mode. The first selection module is used to select, based on the relationship curve, the DQ rotation offset angle that maximizes the oscillation amplitude of the target suppression mode as the local optimal DQ rotation offset angle of the target suppression mode under the current system operating mode; The traversal module is used to traverse all system operating modes and obtain a set of locally optimal DQ rotation offset angles for each target suppression mode i corresponding to different system operating modes; The second selection module is used to perform statistical analysis on each group of locally optimal DQ rotation offset angles and select a robust common angle as the final fixed configuration parameter for the target suppression mode.

9. The apparatus according to claim 8, characterized in that, Also includes: The optimization module is used to collaboratively optimize the mode gain and phase shift angle in the same control channel based on the final fixed configuration parameters of each target suppression mode.

10. The apparatus according to claim 8, characterized in that, The electromagnetic transient simulation model includes a detailed shaft system model, a STATCOM device, a power transmission network, and a series compensation device.

11. The apparatus according to claim 8, characterized in that, The system operation modes include one or more combinations of different network topologies, series compensation switching states, load levels, and power generation output combinations.

12. 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 1-7.

13. 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 1-7.

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