Power subsynchronous resonance suppression system and method

Abstract

The invention discloses an electric power subsynchronous resonance suppression system and method, and relates to the technical field of electric power, and the system comprises a monitoring unit which collects the operation data of an electric power system in real time; the analysis unit is used for evaluating the subsynchronous resonance risk of the power system by applying an algorithm and an analysis tool based on the acquired data; the execution unit is used for adopting corresponding control measures to suppress the subsynchronous resonance according to the analysis result; the communication and interface unit is used for realizing data communication and interface connection among the unit modules; and the protection and fault processing unit is used for monitoring the running state of the system and detecting and processing faults. According to the invention, analysis results and decisions from the analysis unit are received, and corresponding control instructions are quickly executed, so that subsynchronous resonance can be inhibited in time, and further damage to a power system is prevented; through precise control of the series capacitance compensation device control module and the power system operation mode adjustment module, flexible adjustment of the electrical characteristics and the operation mode of the power system can be realized.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a system and method for suppressing electric subsynchronous resonance. Background Art

[0002] Subsynchronous resonance (SSR) is an electromechanical oscillation that can occur in power systems, particularly when high-voltage, long-distance transmission utilizes series capacitor compensation. The extreme complexity of modern power systems, encompassing diverse generator types, transmission line configurations, and load demands, complicates the flexible regulation of power system electrical characteristics and operating modes. Furthermore, SSR manifests in a variety of ways, such as mechanical and electrical torsional vibration interactions. Each of these manifestations may require specific control algorithms and strategies, further complicating power system regulation. Summary of the Invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] Therefore, the problem to be solved by the present invention is that the subsynchronous resonance problem presents various manifestations, such as mechanical torsional vibration interaction and electrical torsional vibration interaction, and each of these different manifestations may require specific control algorithms and strategies to deal with.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a power subsynchronous resonance suppression system, which includes a monitoring unit for collecting operating data of the power system in real time; an analysis unit for evaluating the subsynchronous resonance risk of the power system using algorithms and analysis tools based on the collected data; an execution unit for taking corresponding control measures to suppress subsynchronous resonance according to the analysis results; a communication and interface unit for realizing data communication and interface connection between each unit module; and a protection and fault handling unit for monitoring the operating status of the system and detecting and handling faults.

[0006] As a preferred solution of the electric power subsynchronous resonance suppression system described in the present invention, the monitoring unit includes a data acquisition module for real-time acquisition of multiple electrical quantity data in the power system; a synchronous phasor measurement device for synchronous measurement of electrical quantities and recording the current and voltage sampling values of each interval of each plant and station.

[0007] As a preferred solution of the power subsynchronous resonance suppression system described in the present invention, the analysis unit includes: a data preprocessing module, which is responsible for cleaning, calibrating and formatting data to ensure data accuracy and consistency; an algorithm and analysis tool module, which uses analysis algorithms and analysis tools to analyze the processed data and calculate key indicators of the system's natural oscillation frequency and electrical damping characteristics; and a risk assessment module, which determines whether the power system has the risk of subsynchronous resonance based on the results of the data processing and analysis module.

[0008] As a preferred solution of the electric subsynchronous resonance suppression system described in the present invention, the execution unit includes an analysis module that receives analysis results, makes decisions and executes control instructions; a series capacitor compensation device control module that adjusts the capacity of the series capacitor compensation to change the electrical characteristics of the power system; a power system operation mode adjustment module that changes the operation mode of the power system, adjusts the load distribution and changes the output of the generator set; and an additional damping control device starting module that starts the additional damping control device to increase the damping of the power system through the subsynchronous damping controller and the controllable series compensation device.

[0009] As a preferred solution of the power subsynchronous resonance suppression system described in the present invention, the data acquisition module includes a current sensor for measuring the current value in the power system; a voltage sensor for measuring the voltage value in the power system; a temperature sensor for monitoring the temperature of the power equipment to prevent overheating; a pressure sensor for monitoring the pressure condition inside the power equipment; and a vibration sensor for monitoring the vibration condition of the generator and transformer.

[0010] As a preferred solution of the power subsynchronous resonance suppression system described in the present invention, the analysis module includes: a processor, which receives the results of the analysis unit and makes decisions based on preset control strategies and algorithms; a control algorithm and strategy library, which stores the series capacitor compensation adjustment algorithm, the power system operation mode optimization algorithm and the additional damping control device startup strategy.

[0011] To solve the above technical problems, the present invention provides the following technical solutions: a method for suppressing subsynchronous resonance of electric power, comprising: using a data acquisition module to collect multi-dimensional data of current, voltage, temperature, pressure, and vibration in real time, and using a synchronous phasor measurement device to synchronously sample electrical quantities to ensure the time consistency and accuracy of the data; inputting the collected data into a data preprocessing module for data cleaning, calibration, and formatting to ensure data integrity and accuracy, entering the algorithm and analysis tool module, using analysis algorithms and analysis tools to analyze the processed data, and calculating the key indicators of the system's natural oscillation frequency and electrical damping characteristics; and using a risk assessment module to evaluate the indicators obtained from the analysis, determine whether the power system currently has a subsynchronous resonance risk, and classify the risk level.

[0012] As a preferred solution of the method for suppressing subsynchronous resonance of electric power described in the present invention, after the risk level is graded, the processor in the analysis module makes a decision based on the control algorithm and strategy library, generates a control instruction, and decides on the suppression measures to be taken; according to the control instruction, each functional module under the execution unit acts separately, and the series capacitor compensation device control module dynamically adjusts the series capacitor compensation capacity to optimize the electrical characteristics; the adjustment module adjusts the generator set output and load distribution according to the power system operation mode to optimize the system operation status; the additional damping control device start-up module starts the subsynchronous damping controller or the controllable series compensation device to increase the system damping and further suppress the oscillation; the communication and interface unit is responsible for data communication and coordination between the units, and the protection and fault handling unit monitors the system operation status in real time and handles the fault in time if an abnormality occurs.

[0013] The present invention has the following beneficial effects: The analysis module receives analysis results and decisions from the analysis unit and rapidly executes corresponding control instructions. This rapid response mechanism helps to promptly suppress subsynchronous resonance, preventing it from causing further damage to the power system. Furthermore, through precise control of the series capacitor compensation device control module and the power system operation mode adjustment module, the electrical characteristics and operation mode of the power system can be flexibly adjusted, thereby more effectively suppressing subsynchronous resonance.

[0014] The series capacitor compensation device control module of the present invention can change the electrical characteristics of the power system, such as impedance and frequency response, by adjusting the capacity of the series capacitor compensation, helping to enhance the stability of the power system. The power system operation mode adjustment module can optimize the operating state of the power system and further improve its stability by changing the power system operation mode, such as adjusting load distribution and changing the output of the generator set. And, the additional damping control device activation module can significantly increase the damping of the power system by activating additional damping control devices, such as the subsynchronous damping controller and the controllable series compensation device. This helps to suppress oscillations in the power system, especially subsynchronous resonance, thereby protecting the safe and stable operation of power equipment and systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a block diagram of a power subsynchronous resonance suppression system in Example 1.

[0017] Figure 2 This is a block diagram of a monitoring unit of a power subsynchronous resonance suppression system in Example 1.

[0018] Figure 3 This is a block diagram of a data acquisition module of a power subsynchronous resonance suppression system in Example 1.

[0019] Figure 4 This is a block diagram of an analysis unit of a power subsynchronous resonance suppression system in Example 1.

[0020] Figure 5 This is a block diagram of an execution unit of a power subsynchronous resonance suppression system in Example 1.

[0021] Figure 6 This is a block diagram of an analysis module of a power subsynchronous resonance suppression system in Example 1.

[0022] Among them, 11. Monitoring unit; 111. Data acquisition module; 112. Synchronous phasor measurement device; 1111. Current sensor; 1112. Voltage sensor; 1113. Temperature sensor; 1114. Pressure sensor; 1115. Vibration sensor; 12. Analysis unit; 121. Data preprocessing module; 122. Algorithm and analysis tool module; 123. Risk assessment module; 13. Execution unit; 131. Analysis module; 1311. Processor; 1312. Control algorithm and strategy library; 132. Series capacitor compensation device control module; 133. Power system operation mode adjustment module; 134. Additional damping control device start-up module; 14. Communication and interface unit; 15. Protection and fault handling unit. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Example 1, with reference to Figures 1-6 , which is the first embodiment of the present invention, provides a power subsynchronous resonance suppression system including: Figure 1 As shown:

[0026] The monitoring unit 11 collects the operating data of the power system in real time.

[0027] The analysis unit 12 uses algorithms and analysis tools based on the collected data to evaluate the subsynchronous resonance risk of the power system.

[0028] The execution unit 13 takes appropriate control measures to suppress the subsynchronous resonance according to the analysis result.

[0029] The communication and interface unit 14 implements data communication and interface connection between the unit modules.

[0030] The protection and fault handling unit 15 monitors the operating status of the system and promptly detects and handles faults.

[0031] In this implementation scheme, the stability and safety of the power system are significantly improved through comprehensive monitoring, precise analysis and rapid execution; the monitoring unit 11 collects multi-dimensional data in real time to ensure that the information is comprehensive and accurate; the analysis unit 12 uses professional algorithms to deeply explore the value of data and accurately assess the risk of subsynchronous resonance; the various modules in the execution unit 13 work together to form a comprehensive subsynchronous resonance suppression strategy, which not only takes into account the electrical characteristics and operating mode of the power system, but also takes into account the role of additional damping control devices, thereby achieving comprehensive suppression of subsynchronous resonance.

[0032] Specific examples Figure 2 As shown, the monitoring unit 11 includes: a data acquisition module 111, which collects multiple electrical quantity data in the power system in real time.

[0033] The synchronous phasor measurement device 112 performs synchronous measurement of electrical quantities and records the current and voltage sampling values of each interval of each plant and station.

[0034] In this embodiment, the synchronized phasor measurement device 112 supports a long-term continuous waveform recording function, which can save waveform data within a certain period of time; the high sampling rate can accurately capture subtle changes in electrical quantities, and the configuration of a large-capacity storage medium ensures data integrity and traceability; it provides accurate time synchronization data for the monitoring and analysis of subsynchronous resonance, which helps to accurately determine the occurrence and evolution process of subsynchronous resonance.

[0035] Specific examples Figure 3 As shown, the data acquisition module 111 includes:

[0036] The current sensor 1111 measures the current value in the power system.

[0037] The voltage sensor 1112 measures the voltage value in the power system.

[0038] The temperature sensor 1113 monitors the temperature of the electrical equipment to prevent overheating.

[0039] The pressure sensor 1114 monitors the pressure condition inside the power equipment.

[0040] Vibration sensor 1115 monitors the vibration of the generator and transformer.

[0041] In this embodiment, by collecting current and voltage data in real time through the current sensor 1111 and the voltage sensor 1112, the operating status of the power system can be accurately understood, providing basic data for the monitoring and analysis of subsynchronous resonance; and in conjunction with the temperature sensor 1113, the pressure sensor 1114 and the vibration sensor 1115, the system can comprehensively monitor the health status of the power equipment and promptly detect potential overheating, pressure anomalies and vibration problems.

[0042] Specific examples Figure 4 As shown, the analysis unit 12 includes: a data preprocessing module 121, which is responsible for cleaning, calibrating and formatting data to ensure the accuracy and consistency of the data.

[0043] The algorithm and analysis tool module 122 uses analysis algorithms and analysis tools to analyze the processed data and calculate key indicators of the system's natural oscillation frequency and electrical damping characteristics.

[0044] In this embodiment, the data preprocessing module 121 improves the accuracy and consistency of the input data, providing a high-quality data foundation for subsequent analysis; the algorithm and analysis tool module 122 uses professional analysis methods to deeply explore the key information in the data and accurately calculate the core indicators of the system.

[0045] To further illustrate, the analysis algorithm can use the impedance-frequency sweep method to identify the natural oscillation frequency and damping characteristics of the power system. The specific steps are as follows:

[0046] Frequency sweep signal generation: Set a certain frequency range (such as 0.1Hz to 100Hz) to generate a small-amplitude sinusoidal disturbance signal. The signal amplitude should be small enough to avoid interfering with the normal operation of the system.

[0047] Inject disturbances and record responses: Superimpose the generated sinusoidal signal on the control quantity or reference quantity of the system (such as voltage or current instructions); record the response data of the system at each frequency point in real time through the synchronous phasor measurement device 112 or the electrical quantity sampling device, including voltage, current amplitude and phase changes.

[0048] Impedance calculation: Based on the recorded voltage and current response data, the complex impedance at each frequency point is calculated (Z = V / I, taking into account the phase difference), where Z is the complex impedance, V is the voltage, and I is the current. This results in the impedance-frequency characteristic curve of the power system.

[0049] Characteristic frequency and damping index extraction: On the impedance-frequency curve, identify the frequency corresponding to the impedance amplitude peak, that is, the natural oscillation frequency of the system. Through indicators such as the impedance change rate near the peak and the peak width (bandwidth), further calculate the system's electrical damping characteristics (such as the damping ratio).

[0050] Abnormal characteristic identification: If the impedance in a certain frequency range increases significantly and the damping is low, it is preliminarily determined that there is a risk of subsynchronous resonance at this frequency point, and the characteristic frequency and damping indicators are used as the basis for subsequent control decisions.

[0051] In another optional embodiment, the analysis algorithm may adopt a complex torque coefficient method, which is mainly used to analyze the system stability under mechanical-electrical coupling. The specific steps are as follows:

[0052] System state quantity acquisition: Real-time acquisition of generator terminal voltage, current, mechanical speed, power angle and other data, and synchronous recording of the internal electromechanical dynamic response characteristics of the unit.

[0053] Establish electromechanical dynamics equations: Based on the dynamic characteristics of the motor and the power grid, establish small perturbation equations that include mechanical torque and electromagnetic torque, and establish the linear relationship between electromagnetic torque and small perturbations to mechanical speed.

[0054] Calculate the complex torque coefficient: Use the small perturbation method to solve the complex proportional coefficient of the change in electromagnetic torque to the change in speed, that is, the complex torque coefficient (C = C' + jC", where C' is the synchronous stable component, C" is the subsynchronous oscillation component, and j is the imaginary unit).

[0055] Frequency domain analysis: Plot the complex torque coefficient versus frequency to form the C'-f curve and the C"-f curve, and analyze the sign and amplitude of the C" (imaginary part) curve at a specific frequency.

[0056] Stability index extraction: When C” shows a negative value with a large amplitude in a certain frequency range, it indicates that the system has a subsynchronous resonance risk. This frequency is the system's potentially dangerous oscillation frequency. The system's stability margin and damping level are comprehensively evaluated based on the changing trends of C' and C”.

[0057] Specifically, the analysis unit 12 further includes a risk assessment module 123 for determining whether there is a risk of subsynchronous resonance in the power system based on the results of the data processing and analysis module.

[0058] In this embodiment, based on the preset risk assessment standards and thresholds, the calculated key indicators are compared and judged, and the results of the risk assessment are presented in the form of a report, which may include information such as risk level, potential impact, and recommended measures.

[0059] Specific examples Figure 5 As shown, the execution unit 13 includes:

[0060] The analysis module 131 receives analysis results, makes decisions and executes control instructions.

[0061] The series capacitor compensation device control module 132 adjusts the capacity of the series capacitor compensation to change the electrical characteristics of the power system.

[0062] The power system operation mode adjustment module 133 changes the operation mode of the power system, adjusts the load distribution and changes the output of the generator set.

[0063] The additional damping control device starting module 134 starts the additional damping control device to increase the damping of the power system through the sub-synchronous damping controller and the controllable series compensation device.

[0064] In this embodiment, the analysis module 131 can receive the analysis results and decisions from the analysis unit and quickly execute the corresponding control instructions. This rapid response mechanism helps to timely suppress subsynchronous resonance and prevent it from causing further damage to the power system. Furthermore, through the precise control of the series capacitor compensation device control module 132 and the power system operation mode adjustment module 133, the electrical characteristics and operation mode of the power system can be flexibly adjusted, thereby more effectively suppressing subsynchronous resonance. At the same time, the series capacitor compensation device control module 132 can change the electrical characteristics of the power system, such as impedance and frequency response, by adjusting the capacity of the series capacitor compensation, which helps to enhance the stability of the power system. The power system operation mode adjustment module 133 can optimize the operating state of the power system and further improve its stability by changing the operation mode of the power system, such as adjusting load distribution and changing the output of the generator set. Finally, the additional damping control device activation module 134 can significantly increase the damping of the power system by activating additional damping control devices, such as the subsynchronous damping controller and the controllable series compensation device. This helps to suppress power system oscillations, especially subsynchronous resonance, thereby protecting the safe and stable operation of power equipment and systems.

[0065] Specific examples Figure 6 As shown, the analysis module 131 includes:

[0066] The processor 1311 receives the results of the analysis unit and makes decisions based on preset control strategies and algorithms.

[0067] The control algorithm and strategy library 1312 stores the series capacitor compensation adjustment algorithm, the power system operation mode optimization algorithm and the additional damping control device startup strategy.

[0068] In this embodiment, the processor 1311 executes control instructions, sends control signals to each actuator, and then selects appropriate control algorithms and strategies through the control algorithm and strategy library 1312 based on the analysis results and the real-time status of the power system.

[0069] To further clarify, the strategies and mitigation measures specifically include:

[0070] 1. Series capacitor compensation adjustment strategy (for electrical characteristics optimization), applicable situation: When the impedance-frequency scanning method identifies that the system natural frequency and the grid power frequency coincide or are close, the system equivalent reactance needs to be adjusted to prevent resonant coupling.

[0071] Control strategy content: Use a step-by-step adjustment algorithm to dynamically modify the input capacity of the series capacitor compensation device, set three capacitor input levels: minimum, optimal, and maximum, and dynamically switch according to the risk level.

[0072] Corresponding suppression measures: Through the series capacitor compensation device control module 132, the capacitance value is adjusted to move the system impedance peak position to avoid the generator subsynchronous frequency, thereby weakening the resonance condition; improving the system frequency response flexibility to avoid the overlap of electrical and mechanical oscillation frequencies.

[0073] 2. Power system operation mode adjustment strategy (for structural operation optimization), applicable situations: when the system operation mode leads to concentrated output or uneven load of generator sets in a certain area, forming local energy accumulation and inducing subsynchronous coupling risks.

[0074] Control strategy content: Use dynamic load redistribution strategy to coordinate and adjust the output of key buses or regional nodes; use frequency modulation control optimization algorithm to control certain units to avoid key oscillation frequency points (such as leaving a specific speed range).

[0075] Corresponding suppression measures: Through the power system operation mode adjustment module 133, the active power output and grid connection mode of the generator set are adjusted to redistribute the load of the system in a balanced manner and reduce the risk of system oscillation coupling.

[0076] 3. Additional damping control strategy (for damping enhancement) is applicable when the identified subsynchronous oscillation frequency is in an area where the system's inherent damping coverage is insufficient and conventional adjustments cannot fully suppress the oscillation.

[0077] Control strategy content: Based on the sub-synchronous damping control strategy table, determine whether to start additional damping control. Apply the fuzzy judgment decision algorithm to determine whether different damping devices, such as TCSC (Thyristor Controlled Series Capacitor) and SSDC (Sub-Synchronous Damping Controller), are activated. Consider the disturbance intensity and response speed at the same time and set the activation priority.

[0078] Corresponding suppression measures: by adding a damping control device startup module 134, a controllable series compensation device (such as TCSC) is controlled to start, thereby enhancing the energy absorption capacity of the system in a specific frequency band and weakening the persistence and amplification trend of the subsynchronous resonance component.

[0079] Specifically, in this embodiment, the communication and interface unit 14 and the protection and fault handling unit 15 realize efficient and stable data communication and interface connection between each unit module, ensuring the real-time transmission of information and the coordinated operation of the system; at the same time, it can comprehensively monitor the system operation status, quickly discover and handle potential faults, and effectively improve the reliability and stability of the system; it not only enhances the system's fault prevention and response capabilities, but also further ensures the safe and stable operation of the power system, and provides strong support for suppressing subsynchronous resonance.

[0080] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0081] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0082] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0083] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, it can be implemented using a combination of any of the following technologies known in the art: a discrete logic circuit having logic gate circuits for implementing logic functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0084] Example 2 is the second embodiment of the present invention, which differs from the first embodiment in that: a method for suppressing subsynchronous resonance of electric power includes, through a data acquisition module 111, real-time collection of multi-dimensional data of current, voltage, temperature, pressure, and vibration, and synchronous sampling of electrical quantities through a synchronous phasor measurement device 112 to ensure the time consistency and accuracy of the data.

[0085] The collected data is input into the data preprocessing module 121 for data cleaning, calibration and formatting to ensure data integrity and accuracy. The data is then input into the algorithm and analysis tool module 122 to analyze the processed data using analysis algorithms and analysis tools to calculate the key indicators of the system's natural oscillation frequency and electrical damping characteristics.

[0086] The risk assessment module 123 assesses the indicators obtained from the analysis, determines whether there is a subsynchronous resonance risk in the power system, and classifies the risk level.

[0087] After the risk levels are classified, the processor 1311 in the analysis module 131 makes a decision based on the control algorithm and strategy library 1312, generates control instructions, and determines the suppression measures to be taken.

[0088] According to the control instruction, each functional module under the execution unit 13 acts respectively, and the series capacitor compensation device control module 132 dynamically adjusts the series capacitor compensation capacity to optimize the electrical characteristics.

[0089] According to the power system operation mode adjustment module (133), the generator set output and load distribution are adjusted to optimize the system operation state.

[0090] The additional damping control device starting module 134 starts the sub-synchronous damping controller or the controllable series compensation device to increase the system damping and further suppress the oscillation.

[0091] The communication and interface unit 14 is responsible for data communication and coordination between the various units. The protection and fault handling unit 15 monitors the system operation status in real time and handles the fault in a timely manner if any abnormality occurs.

[0092] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A power subsynchronous resonance suppression system, characterized by: include, A monitoring unit (11) collects operating data of the power system in real time; An analysis unit (12) uses algorithms and analysis tools based on the collected data to assess the subsynchronous resonance risk of the power system; An execution unit (13) takes corresponding control measures to suppress subsynchronous resonance according to the analysis result; Communication and interface unit (14), realizing data communication and interface connection between each unit module; The protection and fault handling unit (15) monitors the operating status of the system and detects and handles faults.

2. The power subsynchronous resonance suppression system according to claim 1, wherein: The monitoring unit (11) comprises, A data acquisition module (111) collects multiple electrical quantity data in the power system in real time; The synchronous phasor measurement device (112) is used for synchronous measurement of electrical quantities and records the current and voltage sampling values of each interval of each plant and station.

3. The power subsynchronous resonance suppression system according to claim 2, wherein: The analyzing unit (12) comprises, The data preprocessing module (121) is responsible for cleaning, calibrating and formatting the data to ensure the accuracy and consistency of the data; Algorithm and analysis tool module (122), using analysis algorithms and analysis tools to analyze the processed data and calculate key indicators of the system's natural oscillation frequency and electrical damping characteristics; The risk assessment module (123) determines whether there is a risk of subsynchronous resonance in the power system based on the results of the data processing and analysis module.

4. The power subsynchronous resonance suppression system according to claim 3, wherein: The execution unit (13) includes: An analysis module (131) receives analysis results, makes decisions and executes control instructions; A series capacitor compensation device control module (132) adjusts the capacity of the series capacitor compensation to change the electrical characteristics of the power system; A power system operation mode adjustment module (133) changes the operation mode of the power system, adjusts the load distribution and changes the output of the generator set; The additional damping control device starting module (134) starts the additional damping control device to increase the damping of the power system through the sub-synchronous damping controller and the controllable series compensation device.

5. The power subsynchronous resonance suppression system according to claim 4, characterized in that: The data acquisition module (111) includes: A current sensor (1111) for measuring a current value in a power system; A voltage sensor (1112) measures a voltage value in the power system; a temperature sensor (1113) to monitor the temperature of the electrical equipment to prevent overheating; A pressure sensor (1114) monitors the pressure condition inside the power equipment; Vibration sensor (1115) monitors the vibration of generators and transformers.

6. The power subsynchronous resonance suppression system according to claim 5, characterized in that: The analysis module (131) comprises: The processor (1311) receives the results of the analysis unit and makes decisions based on the preset control strategy and algorithm; The control algorithm and strategy library (1312) stores the series capacitor compensation adjustment algorithm, the power system operation mode optimization algorithm and the additional damping control device startup strategy.

7. A method for suppressing subsynchronous resonance of an electric power system, using the system for suppressing subsynchronous resonance of an electric power system according to any one of claims 1 to 6, characterized in that: include, The data acquisition module (111) collects multi-dimensional data of current, voltage, temperature, pressure and vibration in real time, and the synchronous phasor measurement device (112) samples the electrical quantity synchronously to ensure the time consistency and accuracy of the data; The collected data is input into the data preprocessing module (121) for data cleaning, calibration and formatting to ensure data integrity and accuracy, and then into the algorithm and analysis tool module (122) to analyze the processed data using analysis algorithms and analysis tools to calculate key indicators of the system's natural oscillation frequency and electrical damping characteristics; The risk assessment module (123) assesses the indicators obtained from the analysis, determines whether the power system currently has a subsynchronous resonance risk, and classifies the risk level.

8. The method for suppressing subsynchronous resonance of an electric power system according to claim 7, wherein: After the risk level is classified, the processor (1311) in the analysis module (131) makes a decision based on the control algorithm and the strategy library (1312), generates a control instruction, and determines the suppression measures to be taken; According to the control instruction, each functional module under the execution unit (13) acts respectively, and the series capacitor compensation device control module (132) dynamically adjusts the series capacitor compensation capacity to optimize the electrical characteristics; Adjusting the generator set output and load distribution according to the power system operation mode adjustment module (133) to optimize the system operation state; The additional damping control device starting module (134) starts the sub-synchronous damping controller or the controllable series compensation device to increase the system damping and further suppress the oscillation; The communication and interface unit (14) is responsible for data communication and coordination between the units, and the protection and fault handling unit (15) monitors the system operation status in real time and handles the fault in a timely manner if an abnormality occurs.

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