A synchronization and grid-connection and insulation collaborative protection control method for a high-pressure unit controller

Abstract

The present application relates to the field of high-voltage generator set adjustment, and discloses a kind of synchronous grid connection and insulation collaborative protection control method of high-pressure machine set controller, comprising the following steps: first, the electrical, insulation and auxiliary parameters of high-pressure machine set are collected and high-precision pretreated, and the high-precision synchronization pre-grid connection calibration of unit is completed by parameter deviation solution and excitation fine adjustment strategy.The present application innovatively couples the whole time sequence process of grid connection with the depth of insulation monitoring and protection, realizes differentiated insulation monitoring and graded early warning in stages, matches the corresponding disposal strategy according to the insulation abnormality level, and finally completes the synchronous closing of the unit without impact and the steady-state control.The present application solves the problems of low synchronization accuracy, disconnection of grid connection control and insulation protection, and difficulty in predicting insulation hazards in traditional high-voltage grid connection, effectively reducing the risk of 6kV / 10kV high-voltage machine set grid connection impact and insulation failure.

Description

Technical Field

[0001] This invention relates to the field of high-voltage generator set regulation, and in particular to a method for synchronous grid connection and insulation coordinated protection control of a high-voltage generator set controller. Background Technology

[0002] Currently, 6kV / 10kV high-voltage generator sets are widely used in high-voltage power supply scenarios such as self-provided power stations in industrial and mining areas and emergency power supply stations. The grid connection operation of these units places stringent requirements on synchronization accuracy and operational safety. Existing grid connection control technologies for high-voltage units mostly employ conventional voltage phase acquisition and fixed excitation regulation strategies. These strategies suffer from weak sampling anti-interference capabilities and limited phase calibration accuracy, making them ill-suited for the strong electromagnetic interference environment under high-voltage conditions. This easily leads to large deviations in voltage, phase, and frequency matching between the generator and the grid, resulting in large inrush currents during grid connection. This not only affects the stability of the power grid but also easily damages the high-voltage electrical equipment of the generator set. Furthermore, traditional control systems set up grid connection synchronization control and insulation protection as two independent operating modules, with fragmented timing logic and a lack of coordinated linkage mechanisms.

[0003] Existing technologies have significant shortcomings in insulation protection throughout the entire grid connection process for high-voltage generator units. Voltage fluctuations and electromagnetic stress concentrations during grid connection can easily induce latent faults such as winding and cable insulation aging and localized breakdowns. Conventional insulation monitoring methods are mostly offline, timed detection or passive steady-state monitoring, unable to achieve real-time monitoring and prediction of the dynamic grid connection process. When minor insulation anomalies exist in the unit, traditional systems cannot provide early warnings, easily leading to grid connection with hidden dangers, which can then cause safety accidents such as high-voltage grounding short circuits, equipment burnout, and grid tripping, severely reducing the reliability and safety of high-voltage generator unit grid connection operation.

[0004] To address the shortcomings of existing technologies, a synchronous grid connection and insulation collaborative protection control method for high-voltage generator unit controllers is proposed. This method effectively avoids the risk of insulation faults under high-voltage grid connection conditions, balances high-voltage grid connection accuracy and unit operation safety, and is suitable for the stable grid connection operation requirements of various 6kV / 10kV high-voltage generator units. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and provides a method for synchronous grid connection and insulation coordinated protection control of a high-voltage unit controller.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of this invention provides a method for synchronous grid connection and insulation coordinated protection control of a high-voltage generator unit controller, comprising the following steps: The high-voltage generator unit's overall electrical parameters, insulation parameters, and auxiliary parameters are collected, and the data is preprocessed. Based on the high-precision associated parameters of the target high-voltage generator unit, the grid connection parameter deviation of the target high-voltage generator unit is calculated and the high-voltage synchronization condition is determined, and the high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit is completed. After completing the high-precision synchronous pre-grid calibration of the target high-voltage unit, perform the deep coupling and binding configuration of grid connection protection timing and insulation monitoring; After completing the configuration of deep coupling and binding between grid-connected protection timing and insulation monitoring, the insulation status classification and early warning judgment of the entire grid-connected process is executed; For high-precision target high-voltage generator units after the high-precision target high-voltage generator unit processing scheme is implemented, shockless synchronous grid connection and grid connection steady-state control are performed.

[0007] Furthermore, in a preferred embodiment of the present invention, the step of collecting and preprocessing the high-voltage generator's overall electrical parameters, insulation parameters, and auxiliary parameters, and performing data preprocessing, specifically includes: Acquire the target high-voltage generator set, wherein the target high-voltage generator set is an industrial high-voltage generator set with a voltage level of 6kV / 10kV and capable of grid-connected operation; Real-time acquisition of electrical parameters such as amplitude, frequency, and phase of terminal voltage and grid-side voltage within the target high-voltage unit, and marking them as the unit's overall electrical parameters; Simultaneously, the insulation resistance, leakage current, and dielectric loss insulation parameters of the unit's stator winding, high-voltage outgoing cables, and high-voltage control cabinet busbars are collected and marked as unit insulation parameters; Finally, the unit operating load and ambient temperature and humidity auxiliary operating parameters are collected and marked as unit auxiliary parameters; The collected unit-wide electrical parameters, unit insulation parameters, and unit auxiliary parameters are preprocessed, including adaptive filtering, time-series correction, and abnormal mutation screening, to output high-precision unit-wide electrical parameters, unit insulation parameters, and unit auxiliary parameters, which are then integrated into high-precision target high-voltage unit correlation parameters.

[0008] Furthermore, in a preferred embodiment of the present invention, the step of calculating grid connection parameter deviations and determining high-voltage synchronization conditions for the target high-voltage generator unit based on high-precision target high-voltage generator unit correlation parameters, and completing high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit, specifically includes: Retrieve the preprocessed full-domain electrical parameters of the high-precision target high-voltage unit from the associated parameters, and import them into the data analysis unit; In the data analysis unit, a preset difference calculation model is used, and the difference calculation model performs difference calculations on the preprocessed unit-wide electrical parameters one by one, and outputs the deviation value of the preprocessed unit-wide electrical parameters. The safety deviation threshold range for grid connection of the target high-voltage unit is preset and analyzed in combination with the deviation values ​​of the pre-processed unit's total electrical parameters. If the deviation values ​​of all pre-processed unit electrical parameters are within the safe deviation threshold range, then the target high-voltage unit is judged to meet the high-voltage initial grid connection synchronization condition. If the deviation values ​​of the pre-processed unit's total electrical parameters do not remain within the safe deviation threshold range, then the target high-voltage unit's grid-connected synchronous operating condition is deemed to be substandard. For target high-voltage generator units that do not meet the grid-connection synchronization conditions, implement high-precision synchronous calibration control with rapid excitation fine-tuning to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator units.

[0009] Furthermore, in a preferred embodiment of the present invention, the step of performing high-precision synchronous calibration control for excitation rapid fine-tuning on the target high-voltage generator unit whose grid-connection synchronization condition does not meet the standard, to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator unit, specifically involves: For target high-voltage units that do not meet the grid-connected synchronous operating conditions, an adaptive excitation regulation control strategy is matched in the data analysis unit based on the deviation values ​​of the pre-processed unit's total electrical parameters that are not maintained within the safety deviation threshold range. Among them, a historical data network is preset in the data analysis unit, and different adaptive excitation regulation and control strategies are stored in the historical data network; When the deviation values ​​of all pre-processed unit electrical parameters are within the safe deviation threshold range, the high-precision synchronous pre-grid calibration of the target high-voltage unit is completed and it is marked as a high-precision target high-voltage unit.

[0010] Furthermore, in a preferred embodiment of the present invention, after completing the high-precision synchronous pre-grid calibration of the target high-voltage unit, the deep coupling and binding configuration of grid-connected protection timing and insulation monitoring is performed, specifically as follows: In the data analysis unit, the complete grid-connected operation process of the high-precision target high-voltage unit is divided into four time nodes: grid-connected standby stage, synchronous adjustment stage, grid-connected closing stage, and grid-connected steady-state operation stage. Retrieve the insulation risk characteristics of high-precision target high-voltage generator units, and for each time sequence node, match the corresponding time sequence node's exclusive insulation monitoring threshold, monitoring frequency and protection response logic; Among them, the specific insulation monitoring thresholds, monitoring frequencies, and protection response logic for different time-series nodes are retrieved from the historical data network; A preset timing priority determination rule is established, which sets the corresponding insulation monitoring logic and grid-connected synchronous adjustment logic to have the same execution priority in the timing nodes of the grid-connected standby phase and the synchronous adjustment phase. During the timing nodes of the grid connection phase, the insulation monitoring logic and grid connection synchronization adjustment logic are dynamically increased, and the execution priority of the insulation monitoring logic and grid connection synchronization adjustment logic is restored during the timing nodes of the grid connection and voltage stabilization operation phase.

[0011] Furthermore, in a preferred embodiment of the present invention, after completing the deep coupling and binding configuration of grid-connected protection timing and insulation monitoring, the insulation status classification and early warning determination for the entire grid-connected process is performed, specifically as follows: Based on the exclusive insulation monitoring thresholds and monitoring frequencies matched with different time nodes, the high-precision target high-voltage unit's unit insulation parameters and unit auxiliary parameters are retrieved in real time in the data analysis unit. The unit insulation parameters are corrected by environmental compensation based on the unit auxiliary parameters, and the corrected high-precision target high-voltage unit insulation parameters are output. In the data analysis unit, the three-level insulation anomaly judgment threshold standard is preset. Based on the three-level insulation anomaly judgment threshold standard, the unit insulation parameters of the corrected high-precision target high-voltage unit are compared and analyzed in real time with the dedicated insulation monitoring threshold of the corresponding time sequence node, and the offset rate is calculated. Based on the offset rate, the insulation anomaly level of the unit insulation parameters of the corrected high-precision target high-voltage generator unit is defined. The high-precision target high-voltage generator unit processing scheme corresponding to different insulation anomaly levels is retrieved from the historical data network and output, thus completing the high-precision target high-voltage generator unit insulation collaborative protection control.

[0012] Furthermore, in a preferred embodiment of the present invention, the step of performing shockless synchronous grid connection and grid-connected steady-state control on the high-precision target high-voltage generator unit after the high-precision target high-voltage generator unit processing scheme has been implemented specifically includes: The data analysis unit monitors the insulation status of high-precision target high-voltage units in real time. If the output processing of the high-precision target high-voltage generator set processing scheme corresponding to different insulation abnormality levels is completed, the high-precision target high-voltage generator set will be calibrated as a high-precision insulation correction high-voltage generator set, and it will be determined that the high-precision insulation correction high-voltage generator set meets the high-voltage safety grid connection and closing conditions. When the high-precision insulation-corrected high-voltage generator set meets the high-voltage safety grid connection and closing conditions, the data analysis unit controls the generator set controller of the high-precision insulation-corrected high-voltage generator set and controls the generator set controller to lock the closing sequence in which the phase difference between the generator terminal voltage and the grid voltage of the high-precision insulation-corrected high-voltage generator set is closest to zero, and marks it as the optimal closing sequence. Based on the optimal closing sequence, the unit controller outputs the closing drive command and grid connection command of the high-precision insulation correction high-voltage unit. After the high-precision insulation correction high-voltage unit completes grid connection and closing, the data analysis unit continuously updates the overall electrical parameters, unit insulation parameters and unit auxiliary parameters to complete the grid-connected steady-state operation of the high-precision insulation correction high-voltage unit.

[0013] This invention addresses the technical deficiencies in the prior art and offers the following advantages: First, it collects and pre-processes the electrical, insulation, and auxiliary parameters of the high-voltage generator unit with high precision. Then, through parameter deviation calculation and excitation fine-tuning strategies, it completes high-precision synchronous pre-grid connection calibration of the unit. This invention innovatively integrates the entire grid connection time-series process with insulation monitoring and protection, achieving phased differentiated insulation monitoring and graded early warning. Corresponding handling strategies are matched according to the insulation anomaly level, ultimately achieving shock-free synchronous closing and steady-state control of the unit. This invention solves the problems of low synchronization accuracy, disconnect between grid connection control and insulation protection, and difficulty in predicting insulation hazards in traditional high-voltage grid connection methods, effectively reducing the risks of grid connection impact and insulation faults for 6kV / 10kV high-voltage generator units. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0015] Figure 1 A flowchart of a synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller is shown; Figure 2 A flowchart of a method for high-precision synchronous pre-grid calibration of the target high-voltage unit is shown. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0018] Figure 1A flowchart illustrating a method for synchronous grid connection and insulation coordinated protection control of a high-voltage generator unit controller is shown, including the following steps: The high-voltage generator unit's overall electrical parameters, insulation parameters, and auxiliary parameters are collected, and the data is preprocessed. Based on the high-precision associated parameters of the target high-voltage generator unit, the grid connection parameter deviation of the target high-voltage generator unit is calculated and the high-voltage synchronization condition is determined, and the high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit is completed. After completing the high-precision synchronous pre-grid calibration of the target high-voltage unit, perform the deep coupling and binding configuration of grid connection protection timing and insulation monitoring; After completing the configuration of deep coupling and binding between grid-connected protection timing and insulation monitoring, the insulation status classification and early warning judgment of the entire grid-connected process is executed; For high-precision target high-voltage generator units after the high-precision target high-voltage generator unit processing scheme is implemented, shockless synchronous grid connection and grid connection steady-state control are performed.

[0019] Furthermore, in a preferred embodiment of the present invention, the step of collecting and preprocessing the high-voltage generator's overall electrical parameters, insulation parameters, and auxiliary parameters, and performing data preprocessing, specifically includes: Acquire the target high-voltage generator set, wherein the target high-voltage generator set is an industrial high-voltage generator set with a voltage level of 6kV / 10kV and capable of grid-connected operation; Real-time acquisition of electrical parameters such as amplitude, frequency, and phase of terminal voltage and grid-side voltage within the target high-voltage unit, and marking them as the unit's overall electrical parameters; Simultaneously, the insulation resistance, leakage current, and dielectric loss insulation parameters of the unit's stator winding, high-voltage outgoing cables, and high-voltage control cabinet busbars are collected and marked as unit insulation parameters; Finally, the unit operating load and ambient temperature and humidity auxiliary operating parameters are collected and marked as unit auxiliary parameters; The collected unit-wide electrical parameters, unit insulation parameters, and unit auxiliary parameters are preprocessed, including adaptive filtering, time-series correction, and abnormal mutation screening, to output high-precision unit-wide electrical parameters, unit insulation parameters, and unit auxiliary parameters, which are then integrated into high-precision target high-voltage unit correlation parameters.

[0020] It should be noted that the target high-voltage generator unit is an industrial high-voltage generator unit with a voltage level of 6kV / 10kV and capable of grid-connected operation. First, three types of core grid-connected parameters from the generator side and the grid side are collected simultaneously, covering all electrical variables required for grid-connected synchronous determination, forming full-domain electrical data. This includes the generator terminal high-voltage circuit, the grid access high-voltage circuit, and the generator high-voltage insulation equipment as the target objects for parameter collection. The amplitude, frequency, and phase electrical parameters of the generator terminal voltage and grid side voltage of the target high-voltage generator unit are collected in real time through the high-voltage isolation sampling module. At the same time, the insulation resistance, leakage current, and dielectric loss insulation parameters of the generator stator winding, high-voltage outgoing cables, and high-voltage control cabinet busbars are collected through the online insulation monitoring sensor. Simultaneously, the generator operating load and ambient temperature and humidity auxiliary operating parameters are collected.

[0021] Subsequently, high-voltage electromagnetic noise is eliminated through anti-interference filtering, the timestamps of electrical, insulation, and auxiliary parameters are unified through timing correction, and jitter interference data is removed through anomaly screening to complete the data precision processing. The aim is to solve the problems of data distortion, timing misalignment, and data jump in sampling under high-voltage and strong electromagnetic environment, and output high-precision data that can be used for precise control.

[0022] Furthermore, in a preferred embodiment of the present invention, after completing the high-precision synchronous pre-grid calibration of the target high-voltage unit, the deep coupling and binding configuration of grid-connected protection timing and insulation monitoring is performed, specifically as follows: In the data analysis unit, the complete grid-connected operation process of the high-precision target high-voltage unit is divided into four time nodes: grid-connected standby stage, synchronous adjustment stage, grid-connected closing stage, and grid-connected steady-state operation stage. Retrieve the insulation risk characteristics of high-precision target high-voltage generator units, and for each time sequence node, match the corresponding time sequence node's exclusive insulation monitoring threshold, monitoring frequency and protection response logic; Among them, the specific insulation monitoring thresholds, monitoring frequencies, and protection response logic for different time-series nodes are retrieved from the historical data network; A preset timing priority determination rule is established, which sets the corresponding insulation monitoring logic and grid-connected synchronous adjustment logic to have the same execution priority in the timing nodes of the grid-connected standby phase and the synchronous adjustment phase. During the timing nodes of the grid connection phase, the insulation monitoring logic and grid connection synchronization adjustment logic are dynamically increased, and the execution priority of the insulation monitoring logic and grid connection synchronization adjustment logic is restored during the timing nodes of the grid connection and voltage stabilization operation phase.

[0023] It should be noted that the entire process of the generating unit from grid connection preparation to steady-state operation is meticulously broken down into four independent yet coherent operational phases: grid connection standby phase, synchronous regulation phase, grid connection phase, and grid connection steady-state operation phase. Considering the operating conditions and insulation risk intensity of the high-voltage generating unit at different grid connection phases, each phase is individually configured with dedicated monitoring accuracy, sampling frequency, and protection action logic. This allows for differentiated management across phases, aiming to prevent misjudgments, missed judgments, or resource waste caused by a uniform monitoring logic. During the pre-grid connection preparation and parameter adjustment phase, grid connection synchronization calibration control and insulation status monitoring are operated in parallel with consistent priority. These two logics operate synchronously without interference, ensuring accurate unit parameter adjustment while simultaneously monitoring insulation status in real time. This prevents potential insulation problems during grid connection parameter adjustment. In the subsequent grid connection phase, the insulation monitoring logic and grid connection synchronization adjustment logic are dynamically adjusted at key timing points. This is because this is the most risky transient moment in high-voltage grid connection, strengthening instantaneous monitoring and control capabilities to withstand insulation breakdown and parameter abrupt changes caused by closing impacts. After returning to steady state, the process resumes normally.

[0024] Furthermore, in a preferred embodiment of the present invention, after completing the deep coupling and binding configuration of grid-connected protection timing and insulation monitoring, the insulation status classification and early warning determination for the entire grid-connected process is performed, specifically as follows: Based on the exclusive insulation monitoring thresholds and monitoring frequencies matched with different time nodes, the high-precision target high-voltage unit's unit insulation parameters and unit auxiliary parameters are retrieved in real time in the data analysis unit. The unit insulation parameters are corrected by environmental compensation based on the unit auxiliary parameters, and the corrected high-precision target high-voltage unit insulation parameters are output. In the data analysis unit, the three-level insulation anomaly judgment threshold standard is preset. Based on the three-level insulation anomaly judgment threshold standard, the unit insulation parameters of the corrected high-precision target high-voltage unit are compared and analyzed in real time with the dedicated insulation monitoring threshold of the corresponding time sequence node, and the offset rate is calculated. Based on the offset rate, the insulation anomaly level of the unit insulation parameters of the corrected high-precision target high-voltage generator unit is defined. The high-precision target high-voltage generator unit processing scheme corresponding to different insulation anomaly levels is retrieved from the historical data network and output, thus completing the high-precision target high-voltage generator unit insulation collaborative protection control.

[0025] It should be noted that, firstly, according to the specific monitoring thresholds and sampling frequencies for each stage, the real-time insulation parameters of the unit and auxiliary operating parameters such as load, temperature, and humidity are synchronously retrieved. Then, using the unit load and ambient temperature and humidity auxiliary parameters, the original insulation resistance, leakage current, and dielectric loss parameters are compensated and corrected using algorithms to eliminate data deviations caused by the environment and operating conditions. Simultaneously, the system has built-in three-level insulation anomaly judgment benchmarks: slight, moderate, and severe. Specifically, if the real-time insulation status parameters deviate slightly from the benchmark threshold without a continuous deterioration trend, it is judged as a Level 1 slight insulation anomaly, triggering background data recording and normal early warning prompts. If the real-time insulation status parameters continuously deviate and the fluctuation amplitude exceeds the normal allowable range, it is judged as a Level 2 moderate insulation anomaly, triggering audible and visual early warning signals, locking the current unit grid-connection synchronization parameters, suspending subsequent grid-connection operations, and continuously tracking changes in insulation status. If the real-time insulation parameters suddenly drop and the leakage current severely exceeds the limit, reaching the high-risk fault threshold, it is judged as a Level 3 severe insulation anomaly, immediately blocking the unit grid-connection command, marking the unit as having a high risk of high-voltage insulation breakdown, and prohibiting the unit from connecting to the grid with the fault.

[0026] In the subsequent steps, the corrected actual insulation parameters will be compared with the exclusive thresholds of each grid-connected timing node to accurately calculate the real-time offset rate of the insulation parameters, quantify the degree of insulation degradation, classify the insulation anomaly level into three levels based on the parameter offset rate, retrieve the corresponding level handling strategy pre-stored in the historical data network, i.e. the strategy proposed above, and output the matching control scheme to complete the collaborative protection closed-loop control of grid connection and insulation.

[0027] Furthermore, in a preferred embodiment of the present invention, the step of performing shockless synchronous grid connection and grid-connected steady-state control on the high-precision target high-voltage generator unit after the high-precision target high-voltage generator unit processing scheme has been implemented specifically includes: The data analysis unit monitors the insulation status of high-precision target high-voltage units in real time. If the output processing of the high-precision target high-voltage generator set processing scheme corresponding to different insulation abnormality levels is completed, the high-precision target high-voltage generator set will be calibrated as a high-precision insulation correction high-voltage generator set, and it will be determined that the high-precision insulation correction high-voltage generator set meets the high-voltage safety grid connection and closing conditions. When the high-precision insulation-corrected high-voltage generator set meets the high-voltage safety grid connection and closing conditions, the data analysis unit controls the generator set controller of the high-precision insulation-corrected high-voltage generator set and controls the generator set controller to lock the closing sequence in which the phase difference between the generator terminal voltage and the grid voltage of the high-precision insulation-corrected high-voltage generator set is closest to zero, and marks it as the optimal closing sequence. Based on the optimal closing sequence, the unit controller outputs the closing drive command and grid connection command of the high-precision insulation correction high-voltage unit. After the high-precision insulation correction high-voltage unit completes grid connection and closing, the data analysis unit continuously updates the overall electrical parameters, unit insulation parameters and unit auxiliary parameters to complete the grid-connected steady-state operation of the high-precision insulation correction high-voltage unit.

[0028] It should be noted that during the final stage of the unit's preparation for grid connection, continuous dynamic monitoring of the real-time insulation status of the unit's stator windings, high-voltage cables, and control cabinet busbars is conducted to prevent any undetected abrupt changes in insulation status. This aims to prevent high-risk situations where synchronization is qualified but insulation suddenly becomes abnormal during grid connection, thus meeting the high safety protection requirements of 6kV / 10kV high-voltage units. For minor or moderate insulation abnormalities that occurred earlier, after the system has completed the corresponding level of rectification, compensation, voltage stabilization, and load reduction repairs, the unit's status is recalibrated to determine if the unit meets both insulation and electrical safety standards for grid connection. Finally, after all electrical and insulation requirements of the unit are met, the controller tracks the phase difference between the generator and the grid voltage in real time, accurately captures the instantaneous window when the phase approaches zero, locks the optimal closing time, and completes the closing and grid connection at this moment. After successful grid connection, the system continuously updates the three types of parameters: electrical, insulation, and environmental load, and continuously maintains grid connection steady-state collaborative monitoring and control, achieving high-precision control and insulation protection throughout the entire grid connection process, and realizing full-cycle safety control from pre-synchronization, closing to steady-state operation.

[0029] Figure 2 A flowchart illustrating the method for high-precision synchronous pre-grid connection calibration of the target high-voltage unit is shown, including the following steps: S202: Based on the high-precision target high-voltage generator unit correlation parameters, calculate the grid connection parameter deviation and determine the high-voltage synchronization condition of the target high-voltage generator unit, and complete the high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit; S204: For target high-voltage generator units that do not meet the grid-connection synchronization conditions, perform high-precision synchronous calibration control with rapid excitation fine adjustment to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator unit.

[0030] Furthermore, in a preferred embodiment of the present invention, the step of calculating grid connection parameter deviations and determining high-voltage synchronization conditions for the target high-voltage generator unit based on high-precision target high-voltage generator unit correlation parameters, and completing high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit, specifically includes: Retrieve the preprocessed full-domain electrical parameters of the high-precision target high-voltage unit from the associated parameters, and import them into the data analysis unit; In the data analysis unit, a preset difference calculation model is used, and the difference calculation model performs difference calculations on the preprocessed unit-wide electrical parameters one by one, and outputs the deviation value of the preprocessed unit-wide electrical parameters. The safety deviation threshold range for grid connection of the target high-voltage unit is preset and analyzed in combination with the deviation values ​​of the pre-processed unit's total electrical parameters. If the deviation values ​​of all pre-processed unit electrical parameters are within the safe deviation threshold range, then the target high-voltage unit is judged to meet the high-voltage initial grid connection synchronization condition. If the deviation values ​​of the pre-processed unit's total electrical parameters do not remain within the safe deviation threshold range, then the target high-voltage unit's grid-connected synchronous operating condition is deemed to be substandard. For target high-voltage generator units that do not meet the grid-connection synchronization conditions, implement high-precision synchronous calibration control with rapid excitation fine-tuning to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator units.

[0031] It should be noted that the data analysis unit is used for unified data processing. A pre-set difference calculation model is used to perform point-to-point difference calculations on the voltage amplitude, frequency, and phase between the generating unit and the grid. This accurately quantifies the degree of deviation of the three core grid-connection parameters and outputs a quantified deviation value. Traditional high-voltage grid connection methods often rely on coarse threshold judgments and lack precise difference quantification, making it impossible to identify minute phase and frequency deviations. This solution uses point-to-point difference calculations to accurately capture subtle synchronization errors of the high-voltage generating unit, facilitating subsequent data quantification analysis. A dedicated grid-connection safety threshold is specifically configured for 6kV / 10kV high-voltage generating units, distinct from the general thresholds for low-voltage units. Combined with the quantified deviation value, a special operating condition analysis is conducted. Setting thresholds that match the high-voltage withstand capability, high-precision grid connection, and impact resistance requirements of high-voltage generating units avoids grid-connection shocks and equipment damage caused by adapting general thresholds to high-voltage operating conditions. Furthermore, only when the deviations of the three parameters—voltage, frequency, and phase—are all within acceptable limits is the unit deemed to have preliminary grid-connection conditions, preventing false synchronization conditions where only one parameter meets the standard while others deviate. Meeting the standard for a single parameter can easily cause grid disturbances and lead to faults. If any core grid connection parameter deviates beyond the standard, the grid connection condition is immediately determined to be unqualified, and blindly closing the circuit is prohibited. Subsequent synchronous calibration and adjustment must be waited for.

[0032] Furthermore, in a preferred embodiment of the present invention, the step of performing high-precision synchronous calibration control for excitation rapid fine-tuning on the target high-voltage generator unit whose grid-connection synchronization condition does not meet the standard, to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator unit, specifically involves: For target high-voltage units that do not meet the grid-connected synchronous operating conditions, an adaptive excitation regulation control strategy is matched in the data analysis unit based on the deviation values ​​of the pre-processed unit's total electrical parameters that are not maintained within the safety deviation threshold range. Among them, a historical data network is preset in the data analysis unit, and different adaptive excitation regulation and control strategies are stored in the historical data network; When the deviation values ​​of all pre-processed unit electrical parameters are within the safe deviation threshold range, the high-precision synchronous pre-grid calibration of the target high-voltage unit is completed and it is marked as a high-precision target high-voltage unit.

[0033] It should be noted that for units with out-of-tolerance voltage, frequency, or phase parameters, the system accurately identifies the type of out-of-tolerance parameter and the specific deviation value, and intelligently matches the corresponding excitation regulation strategy based on the deviation characteristics. For example, for frequency deviation conditions, a unit speed fine-tuning command is output, cooperating with the unit speed control system to quickly correct and return the high-voltage side operating frequency to its correct position. For voltage amplitude and voltage phase deviation conditions, a dynamic step-size adjustment logic is adopted, adaptively matching the excitation regulation step size according to the magnitude of the deviation value. When the deviation value is large, a large step size is used for rapid correction adjustment, and when the deviation value is close to the safe deviation threshold range, a small step size is used for fine-tuning. These strategies can be found in the historical data network. Subsequently, continuous closed-loop iterative adjustment is performed until the voltage, frequency, and phase of the unit and the grid all meet the high-voltage grid connection safety threshold. The pre-synchronization is then determined to be completed, and the status of the compliant units is marked, achieving seamless connection between the excitation calibration process and the downstream insulation monitoring, graded protection, and closing control.

[0034] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for synchronous grid connection and insulation coordinated protection control of a high-voltage generator unit controller, characterized in that, Includes the following steps: The high-voltage generator unit's overall electrical parameters, insulation parameters, and auxiliary parameters are collected, and the data is preprocessed. Based on the high-precision associated parameters of the target high-voltage generator unit, the grid connection parameter deviation of the target high-voltage generator unit is calculated and the high-voltage synchronization condition is determined, and the high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit is completed. After completing the high-precision synchronous pre-grid calibration of the target high-voltage unit, perform the deep coupling and binding configuration of grid connection protection timing and insulation monitoring; After completing the configuration of deep coupling and binding between grid-connected protection timing and insulation monitoring, the insulation status classification and early warning judgment of the entire grid-connected process is executed; For high-precision target high-voltage generator units after the high-precision target high-voltage generator unit processing scheme is implemented, shockless synchronous grid connection and grid connection steady-state control are performed.

2. The synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller according to claim 1, characterized in that, The process of collecting and preprocessing the high-voltage generator set's overall electrical parameters, insulation parameters, and auxiliary parameters, specifically involves: Acquire the target high-voltage generator set, wherein the target high-voltage generator set is an industrial high-voltage generator set with a voltage level of 6kV / 10kV and capable of grid-connected operation; Real-time acquisition of electrical parameters such as amplitude, frequency, and phase of terminal voltage and grid-side voltage within the target high-voltage unit, and marking them as the unit's overall electrical parameters; Simultaneously, the insulation resistance, leakage current, and dielectric loss insulation parameters of the unit's stator winding, high-voltage outgoing cables, and high-voltage control cabinet busbars are collected and marked as unit insulation parameters; Finally, the unit operating load and ambient temperature and humidity auxiliary operating parameters are collected and marked as unit auxiliary parameters; The collected unit-wide electrical parameters, unit insulation parameters, and unit auxiliary parameters are preprocessed, including adaptive filtering, time-series correction, and abnormal mutation screening, to output high-precision unit-wide electrical parameters, unit insulation parameters, and unit auxiliary parameters, which are then integrated into high-precision target high-voltage unit correlation parameters.

3. The synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller according to claim 1, characterized in that, The process of calculating grid connection parameter deviations and determining high-voltage synchronization conditions for the target high-voltage generator unit based on high-precision target high-voltage generator unit correlation parameters, and completing high-precision synchronization pre-grid connection calibration of the target high-voltage generator unit, specifically includes: Retrieve the preprocessed full-domain electrical parameters of the high-precision target high-voltage unit from the associated parameters, and import them into the data analysis unit; In the data analysis unit, a preset difference calculation model is used, and the difference calculation model performs difference calculations on the preprocessed unit-wide electrical parameters one by one, and outputs the deviation value of the preprocessed unit-wide electrical parameters. The safety deviation threshold range for grid connection of the target high-voltage unit is preset and analyzed in combination with the deviation values ​​of the pre-processed unit's total electrical parameters. If the deviation values ​​of all pre-processed unit electrical parameters are within the safe deviation threshold range, then the target high-voltage unit is judged to meet the high-voltage initial grid connection synchronization condition. If the deviation values ​​of the pre-processed unit's total electrical parameters do not remain within the safe deviation threshold range, then the target high-voltage unit's grid-connected synchronous operating condition is deemed to be substandard. For target high-voltage generator units that do not meet the grid-connection synchronization conditions, implement high-precision synchronous calibration control with rapid excitation fine-tuning to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator units.

4. The synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller according to claim 3, characterized in that, For target high-voltage generator units whose grid-connection synchronization conditions do not meet the standards, high-precision synchronous calibration control with rapid excitation fine-tuning is performed to complete the high-precision synchronous pre-grid-connection calibration of the target high-voltage generator units. Specifically: For target high-voltage units that do not meet the grid-connected synchronous operating conditions, an adaptive excitation regulation control strategy is matched in the data analysis unit based on the deviation values ​​of the pre-processed unit's total electrical parameters that are not maintained within the safety deviation threshold range. Among them, a historical data network is preset in the data analysis unit, and different adaptive excitation regulation and control strategies are stored in the historical data network; When the deviation values ​​of all pre-processed unit electrical parameters are within the safe deviation threshold range, the high-precision synchronous pre-grid calibration of the target high-voltage unit is completed and it is marked as a high-precision target high-voltage unit.

5. The synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller according to claim 1, characterized in that, After completing the high-precision synchronous pre-grid calibration of the target high-voltage unit, the deep coupling and binding configuration of grid-connected protection timing and insulation monitoring is executed, specifically as follows: In the data analysis unit, the complete grid-connected operation process of the high-precision target high-voltage unit is divided into four time nodes: grid-connected standby stage, synchronous adjustment stage, grid-connected closing stage, and grid-connected steady-state operation stage. Retrieve the insulation risk characteristics of high-precision target high-voltage generator units, and for each time sequence node, match the corresponding time sequence node's exclusive insulation monitoring threshold, monitoring frequency and protection response logic; Among them, the specific insulation monitoring thresholds, monitoring frequencies, and protection response logic for different time-series nodes are retrieved from the historical data network; A preset timing priority determination rule is established, which sets the corresponding insulation monitoring logic and grid-connected synchronous adjustment logic to have the same execution priority in the timing nodes of the grid-connected standby phase and the synchronous adjustment phase. During the timing nodes of the grid connection phase, the insulation monitoring logic and grid connection synchronization adjustment logic are dynamically increased, and the execution priority of the insulation monitoring logic and grid connection synchronization adjustment logic is restored during the timing nodes of the grid connection and voltage stabilization operation phase.

6. The synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller according to claim 1, characterized in that, After completing the configuration of deep coupling and binding between grid-connected protection timing and insulation monitoring, the insulation status graded early warning judgment for the entire grid-connected process is executed, specifically as follows: Based on the exclusive insulation monitoring thresholds and monitoring frequencies matched with different time nodes, the high-precision target high-voltage unit's unit insulation parameters and unit auxiliary parameters are retrieved in real time in the data analysis unit. The unit insulation parameters are corrected by environmental compensation based on the unit auxiliary parameters, and the corrected high-precision target high-voltage unit insulation parameters are output. In the data analysis unit, the three-level insulation anomaly judgment threshold standard is preset. Based on the three-level insulation anomaly judgment threshold standard, the unit insulation parameters of the corrected high-precision target high-voltage unit are compared and analyzed in real time with the dedicated insulation monitoring threshold of the corresponding time sequence node, and the offset rate is calculated. Based on the offset rate, the insulation anomaly level of the unit insulation parameters of the corrected high-precision target high-voltage generator unit is defined. The high-precision target high-voltage generator unit processing scheme corresponding to different insulation anomaly levels is retrieved from the historical data network and output, thus completing the high-precision target high-voltage generator unit insulation collaborative protection control.

7. The synchronous grid connection and insulation coordinated protection control method for a high-voltage unit controller according to claim 1, characterized in that, The high-precision target high-voltage generator unit, after the operation of the high-precision target high-voltage generator unit processing scheme, performs shockless synchronous grid connection and grid connection steady-state control, specifically as follows: The data analysis unit monitors the insulation status of high-precision target high-voltage units in real time. If the output processing of the high-precision target high-voltage generator set processing scheme corresponding to different insulation abnormality levels is completed, the high-precision target high-voltage generator set will be calibrated as a high-precision insulation correction high-voltage generator set, and it will be determined that the high-precision insulation correction high-voltage generator set meets the high-voltage safety grid connection and closing conditions. When the high-precision insulation-corrected high-voltage generator set meets the high-voltage safety grid connection and closing conditions, the data analysis unit controls the generator set controller of the high-precision insulation-corrected high-voltage generator set and controls the generator set controller to lock the closing sequence in which the phase difference between the generator terminal voltage and the grid voltage of the high-precision insulation-corrected high-voltage generator set is closest to zero, and marks it as the optimal closing sequence. Based on the optimal closing sequence, the unit controller outputs the closing drive command and grid connection command of the high-precision insulation correction high-voltage unit. After the high-precision insulation correction high-voltage unit completes grid connection and closing, the data analysis unit continuously updates the overall electrical parameters, unit insulation parameters and unit auxiliary parameters to complete the grid-connected steady-state operation of the high-precision insulation correction high-voltage unit.

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