Voltage suppression method and device, electronic equipment and storage medium

Abstract

The invention discloses a voltage suppression method and device, electronic equipment and a storage medium, and relates to the technical field of control, a double-brush grounding topology in which a steam turbine side grounding carbon brush and an exciter shaft head grounding module are connected in parallel is adopted, and a shaft voltage discharge path is widened; a passive filter circuit composed of a resistor and a capacitor is connected in series in an exciter shaft head grounding loop, high-frequency pulsating voltage generated in the commutation period can be directionally discharged, and a low-impedance channel is provided for high-frequency current pulses. The dual-brush topology and the passive filter circuit cooperate to effectively offset the static excitation system and the superposed shaft voltage, and the shaft voltage is prevented from exceeding a safety threshold. The technical effects of reducing the shaft voltage amplitude to be within the safety threshold range, reducing the insulation breakdown risk of the bearing, guaranteeing the stable operation of the excitation system of the steam turbine generator and prolonging the service life of a unit are achieved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of control, and in particular to a voltage suppression method and device, electronic equipment and storage medium. BACKGROUND

[0002] The excitation system of a turbo-generator is an important part of the safety technology field of power system equipment, and is widely used in voltage regulation and stability control of large units. In the related technology, a complete energy conversion system from an alternating current power supply to a direct current excitation is constructed through the cooperative operation of a three-phase full-bridge, a transformer and an excitation winding.

[0003] In the existing grounding carbon brush method, simulation shows that the shaft voltage of the static excitation system alone has exceeded the safety threshold, and in actual operation, other sources of shaft voltage also need to be superimposed, which will significantly increase the risk of bearing insulation breakdown, and further affect the long-term stable operation of the unit. SUMMARY

[0004] The present disclosure provides a voltage suppression method, device, electronic equipment and storage medium.

[0005] According to a first aspect of the present disclosure, a voltage suppression method is provided, comprising: constructing a double-brush grounding topology structure in which a turbine-side grounding carbon brush is connected in parallel with an exciter shaft head grounding module; connecting a passive filter circuit composed of a resistor with a preset resistance value and a capacitor with a preset capacitance value in series in the exciter shaft head grounding loop; based on the passive filter circuit, directing the discharge of high-frequency pulsating voltage generated during commutation to form a low-impedance discharge path for high-frequency current pulses; by the cooperative action of the double-brush grounding topology and the passive filter circuit, reducing the amplitude of the shaft voltage to within the safety threshold range.

[0006] Optionally, the construction of the double-brush grounding topology structure in which the turbine-side grounding carbon brush is connected in parallel with the exciter shaft head grounding module comprises: the turbine-side grounding carbon brush and the exciter-side grounding module in the double-brush grounding topology structure are connected in parallel to form a redundant grounding path; when either brush fails due to poor contact, the other brush maintains the shaft voltage discharge function, ensuring system reliability.

[0007] Optionally, the passive filter circuit composed of a resistor with a preset resistance value and a capacitor with a preset capacitance value connected in series in the exciter shaft head grounding loop comprises: the impedance characteristic of the passive filter circuit satisfies that it presents low impedance to high-frequency components and high impedance to low-frequency components.

[0008] Optionally, the step of forming a low-impedance discharge path for the high-frequency current pulse based on the passive filter circuit discharging the high-frequency pulsating voltage generated during commutation in a directional manner includes: The transient response to the high-frequency current pulse during commutation is achieved through the capacitive reactance characteristic of the capacitor.

[0009] Optionally, the step of reducing the shaft voltage amplitude to within a safe threshold range through the double-brush grounding topology and the passive filter circuit includes: The control voltage waveform smoothness is improved, and the high-frequency pulsating component is eliminated.

[0010] Optionally, the method further includes: Measuring the superimposed voltage amplitude generated by other shaft voltage sources; Adjusting the resistance and capacitance parameters of the passive filter circuit according to the superimposed voltage amplitude, so that the total shaft voltage amplitude is maintained within a safe threshold range.

[0011] According to a second aspect of the present disclosure, a voltage suppression device is provided, including: A construction unit configured to construct a double-brush grounding topology in which a turbine-side grounding carbon brush is connected in parallel with an exciter shaft head grounding module; A series unit configured to connect a passive filter circuit composed of a resistor with a preset resistance value and a capacitor with a preset capacitance value in series in the exciter shaft head grounding loop; A discharge unit configured to form a low-impedance discharge path for the high-frequency current pulse based on the passive filter circuit discharging the high-frequency pulsating voltage generated during commutation in a directional manner; An adjustment unit configured to reduce the shaft voltage amplitude to within a safe threshold range through the double-brush grounding topology and the passive filter circuit.

[0012] Optionally, the construction unit is further configured to: The turbine-side grounding carbon brush and the exciter-side grounding module in the double-brush grounding topology are connected in parallel, forming a redundant grounding path; When any brush fails due to poor contact, the other brush maintains the shaft voltage discharge function, ensuring system reliability.

[0013] Optionally, the series unit is further configured to: The impedance characteristic of the passive filter circuit satisfies that it presents low impedance to high-frequency components and presents high impedance to low-frequency components.

[0014] Optionally, the discharge unit is further configured to: The transient response to the high-frequency current pulse during commutation is achieved through the capacitive reactance characteristic of the capacitor.

[0015] Optionally, the adjustment unit is further configured to: The control voltage waveform smoothness is improved, and high-frequency pulsation components are eliminated.

[0016] Optionally, the apparatus further comprises: a measurement unit configured to measure a superimposed voltage amplitude generated by other shaft voltage sources; The adjustment unit is further configured to adjust resistance and capacitance parameters of the passive filter circuit according to the superimposed voltage amplitude, so that the total shaft voltage amplitude is maintained within a safety threshold range.

[0017] According to a third aspect of the present disclosure, an electronic device is provided, comprising: at least one processor; and a memory connected to the at least one processor in communication; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of the first aspect.

[0018] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, wherein the computer instructions are used to enable the computer to perform the method of the first aspect.

[0019] According to a fifth aspect of the present disclosure, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the method of the first aspect.

[0020] The voltage suppression method, apparatus, electronic device and storage medium provided by the present disclosure widen the shaft voltage discharge path by adopting the double-brush grounding topology of the turbine-side grounding carbon brush and the exciter shaft head grounding module. The passive filter circuit composed of a series resistance and a capacitance in the exciter shaft head grounding loop can discharge the high-frequency pulsating voltage generated during commutation in a directional manner, and provide a low-impedance channel for high-frequency current pulses. The double-brush topology and the passive filter circuit work together to effectively offset the shaft voltage of the static excitation system itself and the superimposed shaft voltage, thereby avoiding the shaft voltage exceeding the safety threshold. Therefore, the technical problem of the shaft voltage exceeding the safety threshold when the static excitation system acts alone in the existing grounding carbon brush method, and the significant increase in the risk of bearing insulation breakdown and the impact on the long-term stable operation of the unit when the shaft voltage is superimposed with other sources of shaft voltage, is solved. The technical effects of reducing the shaft voltage amplitude to within the safety threshold range, reducing the risk of bearing insulation breakdown, ensuring the stable operation of the turbine generator excitation system, and prolonging the service life of the unit are achieved.

[0021] It should be understood that the contents described in this part are not intended to identify the key or important features of the embodiments of the present application, nor are they used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are used to better understand the present scheme and do not constitute a limitation on the present disclosure. Among them: Figure 1 A flowchart of a voltage suppression method provided by an embodiment of the present disclosure; Figure 2 A structural schematic diagram of a voltage suppression device provided by an embodiment of the present disclosure; Figure 3 A structural schematic diagram of another voltage suppression device provided by an embodiment of the present disclosure; Figure 4 A schematic block diagram of an example electronic device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding, and should be considered as merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and structures are omitted in the following description for the sake of clarity and conciseness.

[0024] The voltage suppression method, device, electronic device and storage medium of the embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0025] Figure 1 A flowchart of a voltage suppression method provided by an embodiment of the present disclosure.

[0026] As Figure 1 shown, the method includes the following steps: Step 101, constructing a double-brush grounding topology structure in which a turbine-side grounding carbon brush is connected in parallel with an exciter shaft head grounding module; The double-brush grounding topology structure is constructed in a parallel manner to integrate the turbine-side grounding carbon brush and the exciter shaft head grounding module: the turbine-side grounding carbon brush serves as the original grounding passage of the shaft system, maintaining the basic charge release function; the exciter shaft head grounding module is a newly added grounding unit that forms a reliable electrical connection with the exciter shaft head, and the two are in a parallel relationship in the circuit topology, ensuring that the shaft system can be grounded through two independent paths, thereby breaking through the limitations of the traditional single grounding carbon brush in high-frequency signal processing and laying a structural foundation for subsequent targeted suppression of high-frequency shaft voltage induced by the static excitation system. As an implementation, the topology structure can be adapted to the shaft system parameters of a 600 MW generator, and the exciter shaft head grounding module can be selected in the form of a circuit containing a passive filter element, such as the RC circuit mentioned in the document, and the parallel relationship with the turbine-side grounding carbon brush can achieve electrical signal shunting on the shaft system through wire connection.

[0027] The original grounding function of the grounding carbon brush on the turbine side is retained, and the function dimension of the grounding system is expanded through the newly added exciter shaft head grounding module, which can avoid the problem of protection failure caused by poor contact of a single grounding carbon brush or large high-frequency impedance, provides stable structural support for reducing the shaft voltage to a safe range by combining with the filtering function in the future, and improves the reliability and adaptability of shaft grounding protection.

[0028] Step 102, in the exciter shaft head grounding loop, a passive filter circuit composed of a resistor with a preset resistance value and a capacitor with a preset capacitance value is connected in series; By connecting the passive filter circuit composed of a resistor with a preset resistance value and a capacitor with a preset capacitance value in series in the grounding loop, the grounding loop has high-frequency interference suppression capability. Among them, the resistor element can suppress the sudden change of high-frequency current in the loop, avoid the impact of current shock on the shaft system or grounding components, and the capacitor element can filter the high-frequency voltage components induced by the static excitation system. The two form a decay path for high-frequency shaft voltage. The preset resistance value of the resistor and the preset capacitance value of the capacitor need to be adapted and set based on system parameters such as shaft-to-ground capacitance and excitation winding-to-shaft coupling capacitance, combined with the high-frequency voltage frequency band to be suppressed, to ensure that the filter circuit matches the electrical characteristics of the shaft system and fully plays the filtering role. As an implementation manner, for the shaft parameters of a 600MW generator (such as excitation winding-to-shaft coupling capacitance 500nF and shaft-to-ground equivalent capacitance 200nF), the series-connected resistor can be preset to 500Ω and the capacitor can be preset to 10μF to adapt to the suppression requirements of high-frequency shaft voltage in this scenario.

[0029] By connecting the passive filter circuit in series in the exciter shaft head grounding loop, the grounding path is upgraded from a simple grounding function to a "grounding + filtering" composite function, which can effectively attenuate high-frequency shaft voltage and avoid the adverse effects of high-frequency components on the shaft system through the grounding loop. At the same time, the parameters of the resistor and the capacitor can be preset to adapt to the shaft characteristics of different types of generators, improving the universality of the scheme and providing key filtering protection for reducing the shaft voltage to a safe range in the future.

[0030] Step 103, based on the passive filter circuit, the high-frequency pulsating voltage generated during commutation is directed to discharge, forming a low-impedance discharge path for high-frequency current pulses; The frequency characteristics of resistance and capacitance in the passive filter circuit are used to build a low-impedance discharge path for high-frequency current pulses. Among them, the capacitor element shows low impedance characteristics to high-frequency signals, which can guide the high-frequency pulsating voltage generated during commutation to preferentially pass through the filter circuit to form a discharge to ground, and the resistor element can suppress the sudden change of high-frequency current during discharge to avoid damage to the shaft system or circuit components. The synergistic effect of the two makes the high-frequency pulsating voltage efficiently and directionally discharged through the grounding loop, reducing the accumulation of high-frequency components on the shaft system, and weakening the amplitude of high-frequency shaft voltage from the root. As an embodiment, for the 6 times base frequency (300Hz) high-frequency pulsating voltage generated by the 60-degree commutation delay angle of the three-phase full-bridge in the static excitation system of a 600MW generator, an RC passive filter circuit with a 500Ω resistor and a 10μF capacitor in series can provide a low-impedance path for high-frequency current pulses in this frequency band, realizing directional discharge.

[0031] The high-frequency pulsating voltage directional discharge path built by the passive filter circuit can accurately and effectively release the high-frequency current pulse during commutation, greatly reduce the residual of high-frequency components on the shaft system, and avoid the safety hazards caused by the superposition of high-frequency shaft voltage. At the same time, the low-impedance discharge path overcomes the problem of large impedance of traditional single grounding carbon brush to high-frequency signals and insufficient discharge, further ensures that the shaft voltage is within a safe range, and improves the stability of the generator operation.

[0032] Step 104, through the synergistic effect of the double-brush grounding topology and the passive filter circuit, the amplitude of the shaft voltage is reduced to within the safe threshold range.

[0033] The synergistic effect of the two realizes the reduction of the amplitude of the shaft voltage to within the safe threshold range: the double-brush grounding topology provides two independent grounding paths for the shaft system, the turbine side grounding carbon brush maintains the basic grounding function to release part of the charge, and the passive filter circuit in the exciter shaft head grounding loop plays a high-frequency suppression role. Through the synergistic characteristics of resistance and capacitance, the high-frequency pulsating voltage generated during the commutation of the static excitation system (such as a three-phase full-bridge) is suppressed and efficiently discharged, avoiding the accumulation of high-frequency components on the shaft system. The two are complementary in electrical function, the double-brush topology ensures the redundancy and reliability of the grounding path, and the passive filter circuit ensures the accurate attenuation of the high-frequency shaft voltage. The overall voltage amplitude of the shaft system is effectively controlled, and finally falls within the threshold interval required for safe operation. As an embodiment, for a 600MW generator, when the passive filter circuit uses an RC structure with a 500Ω resistor and a 10μF capacitor, the shaft voltage of more than 50V can be reduced to a safe range of about 10V through the synergistic effect of the two, adapting to the safe operation requirements of this type of generator.

[0034] Stable control of shaft voltage within the safety threshold fundamentally eliminates the threat of high-frequency shaft voltage superposition to the safe operation of the motor; at the same time, it does not need to change the main structure of the generator, and can be adapted to different parameters of the static excitation system generator, giving consideration to protection reliability and application flexibility, and effectively making up for the defects of traditional single grounding carbon brush in insufficient suppression of high-frequency shaft voltage.

[0035] In some embodiments, the double-brush grounding topology in which the turbine-side grounding carbon brush is connected in parallel with the exciter shaft head grounding module includes: The turbine-side grounding carbon brush and the exciter-side grounding module in the double-brush grounding topology are connected in parallel to form a redundant grounding path. When any brush fails due to poor contact, the other brush maintains the shaft voltage discharge function, ensuring system reliability.

[0036] The turbine-side grounding carbon brush is directly assembled at a predetermined grounding position of the turbine-side rotating shaft to form a close electrical contact with the surface of the rotating shaft, and the other end of the grounding carbon brush is directly connected to the ground. Meanwhile, an exciter-side grounding module (which includes a brush component in contact with the exciter shaft head) is assembled at a designated mounting position of the exciter shaft head. The brush of the grounding module also maintains reliable electrical connection with the surface of the exciter shaft head, and its grounding end forms a common ground connection with the grounding end of the turbine-side grounding carbon brush, thereby realizing the parallel relationship between the two in the circuit topology and forming two independent shaft grounding discharge paths (i.e., redundant grounding paths). In actual operation, if the turbine-side grounding carbon brush fails due to wear, dust accumulation, or other reasons, the brush of the exciter shaft head grounding module can still maintain effective electrical connection with the shaft system and continuously discharge the shaft voltage to the ground through the parallel grounding path. Conversely, if the brush of the exciter shaft head grounding module fails, the turbine-side grounding carbon brush can also independently assume the shaft voltage discharge function, ensuring that the entire grounding system is always in an effective working state.

[0037] Through explicit parallel connection and redundant path design, the problem of shaft voltage being unable to be discharged and the amplitude rising sharply when the traditional single grounding carbon brush fails due to poor contact can be directly avoided, effectively ensuring the continuity and reliability of the grounding system. Especially for 600MW-level generators which have high requirements for operational stability, the grounding failure-induced safety risks of the motor can be significantly reduced, providing stable grounding protection for shaft voltage management.

[0038] In some embodiments, the passive filter circuit composed of a resistor with a predetermined resistance value and a capacitor with a predetermined capacitance value in series in the exciter shaft head grounding loop includes: The impedance characteristics of the passive filter circuit satisfy low impedance for high-frequency components and high impedance for low-frequency components.

[0039] One end of the resistor is reliably connected with the ground brush of the exciter shaft head, the other end of the resistor is directly connected with one end of the capacitor, the other end of the capacitor is connected with the system ground end, forming a series path of "ground brush-resistor-capacitor-ground"; wherein, the preset resistance value of the resistor is 500Ω, the preset capacitance value of the capacitor is 10μF, the parameters are determined based on the static excitation system parameters (such as excitation winding coupling capacitor 500nF, shaft system equivalent capacitor 200nF) of 600MW generator and the high-frequency shaft voltage characteristics (6 times of the fundamental frequency 50Hz, i.e. 300Hz high-frequency pulsation) to be suppressed. The impedance characteristics of the circuit are as follows: for the 300Hz and above high-frequency components generated by the static excitation system, the capacitive reactance of the capacitor decreases significantly with the increase of frequency, at this time the total impedance of the circuit is mainly determined by the resistance value, and the whole presents a low impedance state; while for the power frequency (50Hz) and below low-frequency components, the capacitive reactance increases greatly, the total impedance of the circuit is composed of the resistance and the capacitive reactance and has a large value, and the whole presents a high impedance state, thereby realizing the differential impedance response to high-frequency and low-frequency components.

[0040] The impedance characteristics realized by specific parameters can accurately present low impedance to the high-frequency shaft voltage components induced by the static excitation system, ensure effective discharge of high-frequency current pulses, and have little effect on the low-frequency grounding path, avoiding interference with the normal low-frequency charge release function of the shaft system; both the treatment effect of high-frequency shaft voltage and the basic grounding performance of the grounding system are ensured, which provides key filtering protection for subsequent reduction of shaft voltage to about 10V safe range.

[0041] In some embodiments, the low-impedance discharge path of the high-frequency current pulse formed by the passive filter circuit includes: The capacitive reactance characteristics of the capacitor realize the instantaneous response to the high-frequency current pulse during commutation.

[0042] In the process of directional discharge of high-frequency pulsating voltage generated during commutation based on passive filter circuit, the emphasis relies on the capacitive reactance characteristics of the capacitor in the circuit to achieve the instantaneous response of high-frequency current pulse: combined with the characteristics of the six times (i.e. 300Hz) high-frequency pulsating voltage of the base frequency 50Hz generated during commutation in the static excitation system three-phase full-bridge (commutation delay angle is set to 60 degrees), the capacitive reactance of the capacitor with a preset capacitance value of 10μF in the passive filter circuit follows the characteristics of "capacitive reactance inversely proportional to frequency", when the high-frequency current pulse is generated during commutation, the capacitive reactance of the capacitor will quickly decrease with the increase of pulse frequency (300Hz and above), so as to form a low impedance path in a very short time, and realize the instantaneous response of high-frequency current pulse; at this time, the high-frequency current pulse can quickly enter the passive filter circuit from the exciter shaft head through the grounding brush, and then be discharged to the ground through the 500Ω resistor and 10μF capacitor in series, and the instantaneous response characteristics of the capacitor ensure that the high-frequency current pulse will not be retained in the shaft system or the grounding loop, thereby forming a directional and efficient low-impedance discharge path for high-frequency current pulse, and avoiding interference to the normal low-frequency grounding path of the shaft system.

[0043] The specific embodiment realizes instantaneous response through the capacitive reactance characteristics of the capacitor, which can quickly conduct the discharge path at the moment when the high-frequency pulsating voltage is generated, effectively avoids the accumulation of high-frequency current pulse in the shaft system, which leads to the increase of shaft voltage amplitude, and ensures that the high-frequency shaft voltage can be inhibited in time; at the same time, the instantaneous response characteristics of the capacitor do not require additional driving components, and can realize efficient discharge only by relying on its own electrical characteristics, which further improves the stability and reliability of the grounding filter system, and provides key support for the stable reduction of shaft voltage to the safe range.

[0044] In some embodiments, the reduction of the shaft voltage amplitude to the safe threshold range by the double-brush grounding topology and the passive filter circuit includes: The control voltage waveform smoothness is improved, and the high-frequency pulsating component is eliminated.

[0045] In the process of reducing the shaft voltage amplitude to the safe threshold by the double-brush grounding topology cooperating with the passive filter circuit, the double-brush grounding topology and the passive filter circuit form a complementary cooperative mechanism: the turbine side grounding carbon brush first undertakes the basic discharge task of low-frequency charge of the shaft system, reducing the interference of low-frequency voltage components on the overall stability of the shaft voltage waveform; at the same time, the passive filter circuit (composed of a 500Ω resistor and a 10μF capacitor) in series in the exciter shaft head grounding loop plays a role in the 300Hz high-frequency pulsating component generated during the commutation of the static excitation system three-phase full-bridge (commutation delay angle 60 degrees), and the low-capacitance characteristic of the passive filter circuit can respond and capture the high-frequency pulsating voltage instantaneously, and the resistance can suppress the mutation of the high-frequency current pulse, avoiding the voltage waveform from appearing steep fluctuations caused by current impact, and the two together weaken the influence of high-frequency pulsation on the shaft voltage waveform. Specifically, before the cooperative action, the shaft voltage waveform has 6 high-frequency fluctuations within 20ms and the amplitude exceeds 50V, and after the cooperative action, the passive filter circuit effectively eliminates the 300Hz high-frequency pulsating component, and the double-brush grounding topology ensures stable voltage discharge, so that the steep change of the shaft voltage waveform is greatly reduced, the smoothness is significantly improved, and finally the amplitude is reduced to the safe threshold range of about 10V. This process adapts to the parameters of the excitation system (such as the equivalent capacitance of the static excitation system to ground 10nF, the coupling capacitance of the excitation winding to the shaft system 500nF) of the 600MW generator.

[0046] The specific implementation of this cooperative action can avoid the impact damage of high-frequency voltage mutation to the insulation structure of the shaft system by improving the smoothness of the shaft voltage waveform and eliminating the high-frequency pulsating component; at the same time, the elimination of the high-frequency pulsating component prevents the amplitude from exceeding the threshold due to the superposition of other shaft voltage components, ensuring that the shaft system of the 600MW generator is always in a safe operating state, and further improving the stability and durability of the motor operation.

[0047] In some embodiments, the method further comprises: measuring the superimposed voltage amplitude generated by other shaft voltage sources; adjusting the resistance and capacitance parameters of the passive filter circuit according to the superimposed voltage amplitude, so that the total shaft voltage amplitude is maintained within the safe threshold range.

[0048] The superimposed voltage amplitude generated by other shaft voltage sources is measured: a high-precision voltage measuring device (such as an alternating voltage meter with an accuracy of not less than 0.1V and a measurement range covering 0-100V) is used, one end of the measuring device is reliably connected to the generator shaft system (corresponding to the connection point of the shaft system coupling capacitor C2 of the excitation winding pair, and the parameters of the shaft system coupling capacitor 500nF of the 600MW generator excitation winding pair and the equivalent shaft-to-ground capacitor C3200nF are adapted), and the other end is grounded, under the normal operation condition of the static excitation system (three-phase power supply phase voltage effective value 2kV, transformer ratio 2:1, three-phase full-bridge commutation delay angle 60 degrees), the total shaft voltage signal containing the shaft voltage of the static excitation system and the superimposed voltage of other sources is continuously collected, and the superimposed voltage amplitude generated by other shaft voltage sources is separated and measured; then the resistance and capacitance parameters of the passive filter circuit are adjusted according to the superimposed voltage amplitude: if the measurement shows that the superimposed voltage makes the total shaft voltage amplitude exceed the 10V safety threshold, and the high-frequency component of the superimposed voltage accounts for a high proportion, the original 500Ω resistance value can be appropriately reduced to 400-450Ω, or the 10μF capacitance value can be increased to 12-15μF; if the low-frequency component of the superimposed voltage has a significant effect, the resistance can be fine-tuned to 550-600Ω, to ensure that the total shaft voltage amplitude after re-measurement is stably maintained within the safety threshold of 10V, and the adjustment process does not interrupt the normal grounding path of the double-brush grounding topology.

[0049] By accurately measuring the superimposed voltage amplitude and dynamically adjusting the RC parameters, the fluctuations of different other shaft voltage sources can be flexibly responded to, and the total shaft voltage exceeding the safety threshold due to the superposition effect can be avoided; at the same time, the parameter adjustment adapts to the characteristics of the excitation system of the 600MW generator, without the need to reconstruct the grounding topology, which not only guarantees the continuity of shaft voltage control, but also improves the adaptability of the method to complex working conditions.

[0050] Corresponding to the above-mentioned voltage suppression method, the present application also proposes a voltage suppression device. Since the device embodiments of the present application correspond to the above-mentioned method embodiments, the details not disclosed in the device embodiments can be referred to the above-mentioned method embodiments, which will not be described in detail in the present application.

[0051] Figure 2 A structural schematic diagram of a voltage suppression device provided by an embodiment of the present disclosure is shown in Figure 2 as shown, comprising: A construction unit 21 is configured to construct a double-brush grounding topology in which a turbine-side grounding carbon brush is connected in parallel with an exciter shaft head grounding module; A series connection unit 22 is configured to connect a passive filter circuit composed of a resistor with a preset resistance value and a capacitor with a preset capacitance value in series in the exciter shaft head grounding loop; A bleed unit 23 is configured to directively bleed the high-frequency pulsating voltage generated during commutation based on the passive filter circuit, to form a low-impedance bleed path for the high-frequency current pulse; An adjustment unit 24 is configured to reduce the shaft voltage amplitude to a safe threshold range by cooperating with the passive filter circuit in the double-brush grounding topology.

[0052] Further, in a possible implementation of the embodiment of the present disclosure, the construction unit 21 is further configured to: The turbine-side grounding carbon brush and the exciter-side grounding module are connected in parallel in the double-brush grounding topology, to form a redundant grounding path. When any brush fails due to poor contact, the other brush maintains the shaft voltage bleed function, ensuring system reliability.

[0053] Further, in a possible implementation of the embodiment of the present disclosure, the series unit 22 is further configured to: The impedance characteristic of the passive filter circuit satisfies low impedance for high-frequency components and high impedance for low-frequency components.

[0054] Further, in a possible implementation of the embodiment of the present disclosure, the bleed unit 23 is further configured to: The capacitive reactance characteristic of the capacitor is used to achieve instantaneous response to the high-frequency current pulse during commutation.

[0055] Further, in a possible implementation of the embodiment of the present disclosure, the adjustment unit 24 is further configured to: The control voltage waveform smoothness is improved, and the high-frequency pulsating component is eliminated.

[0056] Further, in a possible implementation of the embodiment of the present disclosure, as shown in Figure 3 The apparatus further includes: A measurement unit 25 is configured to measure the superimposed voltage amplitude generated by other shaft voltage sources. The adjustment unit 24 is further configured to adjust the resistance and capacitance parameters of the passive filter circuit according to the superimposed voltage amplitude, so that the total shaft voltage amplitude is maintained within the safe threshold range.

[0057] It should be noted that the foregoing explanation and description of the method embodiment also apply to the apparatus of the embodiment of the present disclosure, and the principle is the same, which is not limited in the embodiment of the present disclosure.

[0058] According to the embodiment of the present disclosure, the present disclosure further provides an electronic device, a readable storage medium, and a computer program product.

[0059] Figure 4A schematic block diagram of an example electronic device 400 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0060] like Figure 4 As shown, device 400 includes a computing unit 401, which can perform various appropriate actions and processes based on a computer program stored in ROM (Read-Only Memory) 402 or a computer program loaded from storage unit 408 into RAM (Random Access Memory) 403. RAM 403 may also store various programs and data required for the operation of device 400. The computing unit 401, ROM 402, and RAM 403 are interconnected via bus 404. I / O (Input / Output) interface 405 is also connected to bus 404.

[0061] Multiple components in device 400 are connected to I / O interface 405, including: input unit 406, such as keyboard, mouse, etc.; output unit 407, such as various types of monitors, speakers, etc.; storage unit 408, such as disk, optical disk, etc.; and communication unit 409, such as network card, modem, wireless transceiver, etc. Communication unit 409 allows device 400 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0062] The computing unit 401 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a CPU (Central Processing Unit), a GPU (Graphic Processing Unit), various special-purpose AI (Artificial Intelligence) computing chips, various computing units running machine learning model algorithms, a DSP (Digital Signal Processor), and any appropriate processor, controller, microcontroller, etc. The computing unit 401 performs various methods and processes described above, such as the voltage suppression method. For example, in some embodiments, the voltage suppression method can be implemented as a computer software program, which is tangibly embodied in a machine-readable medium, such as the storage unit 408. In some embodiments, part or all of the computer program can be loaded and / or installed onto the apparatus 400 via the ROM 402 and / or the communication unit 409. When the computer program is loaded onto the RAM 403 and executed by the computing unit 401, one or more steps of the methods described above can be performed. Alternatively, in other embodiments, the computing unit 401 can be configured to perform the aforementioned voltage suppression method by any other appropriate means, such as by means of firmware.

[0063] Various implementations of the systems and techniques described above herein can be realized in digital electronic circuitry, integrated circuitry, a Field Programmable Gate Array (FPGA), an Application-Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a System on Chip (SOC), a Complex Programmable Logic Device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0064] Program code for carrying out methods of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the program code, when executed by the processor or controller, produces the functions / operations specified in the flowcharts and / or block diagrams. The program code can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0065] In the context of the present disclosure, a machine-readable medium can be a tangible medium that can contain or store program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable storage medium can include but are not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium would include one or more lines of electrical conductors, portable computer disks, hard disks, RAM, ROM, EPROM (Electrically Programmable Read-Only-Memory) or flash memory, optical fiber, CD-ROM (Compact Disc Read-Only Memory), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0066] To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having a display device (e.g., a CRT (Cathode-Ray Tube) or LCD (Liquid Crystal Display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0067] The systems and techniques described herein can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a LAN (Local Area Network), a WAN (Wide Area Network), the Internet, and a blockchain network.

[0068] The computer system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server is generally established using computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service ("Virtual Private Server", or simply "VPS"). The server can also be a server of a distributed system, or a server combined with a blockchain.

[0069] It should be noted that artificial intelligence is a discipline that studies enabling computers to simulate some thinking processes and intelligent behaviors of humans (such as learning, reasoning, thinking, planning, etc.), both hardware and software technologies. Artificial intelligence hardware technology generally includes technologies such as sensors, special artificial intelligence chips, cloud computing, distributed storage, big data processing, etc.; artificial intelligence software technology mainly includes computer vision technology, speech recognition technology, natural language processing technology, and machine learning / deep learning, big data processing technology, knowledge graph technology, etc. several major directions.

[0070] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present disclosure can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, which is not limited herein.

[0071] The above detailed description does not limit the scope of the disclosure. Various modifications, combinations, sub-combinations and alternatives can be made to the detailed description. Any modification, equivalent replacement and improvement etc. made within the spirit and principle of the disclosure shall be included in the scope of the disclosure.

Claims

1. A voltage suppression method, characterized in that, include: Construct a dual-brush grounding topology structure in parallel with the turbine-side grounding carbon brush and the exciter shaft head grounding module; A passive filter circuit consisting of a resistor of preset resistance and a capacitor of preset capacitance is connected in series in the grounding circuit of the exciter shaft head. The passive filter circuit is used to directionally discharge the high-frequency pulsating voltage generated during commutation, forming a low-impedance discharge path for high-frequency current pulses. The dual-brush grounding topology works in conjunction with the passive filter circuit to reduce the shaft voltage amplitude to a safe threshold range.

2. The method according to claim 1, characterized in that, The dual-brush grounding topology structure, which connects the turbine-side grounding carbon brush and the exciter shaft head grounding module in parallel, includes: In the dual-brush grounding topology, the turbine-side grounding carbon brush and the exciter-side grounding module are connected in parallel to form a redundant grounding path. When one brush fails due to poor contact, the other brush maintains the shaft voltage discharge function to ensure system reliability.

3. The method according to claim 1, characterized in that, The passive filter circuit, consisting of a resistor of a preset resistance value and a capacitor of a preset capacitance value connected in series in the exciter shaft grounding circuit, includes: The passive filter circuit has impedance characteristics that present low impedance to high-frequency components and high impedance to low-frequency components.

4. The method according to claim 1, characterized in that, The method of directionally discharging the high-frequency pulsating voltage generated during commutation based on the passive filter circuit, forming a low-impedance discharge path for high-frequency current pulses, includes: The instantaneous response to high-frequency current pulses during commutation is achieved by utilizing the capacitive reactance characteristics of the capacitor.

5. The method according to claim 1, characterized in that, The method of reducing the shaft voltage amplitude to a safe threshold range through the synergistic effect of the dual-brush grounding topology and the passive filter circuit includes: Improve the smoothness of the control voltage waveform and eliminate high-frequency pulsation components.

6. The method according to claim 1, characterized in that, The method further includes: Measure the superimposed voltage amplitude generated by other axis voltage sources; Adjust the resistance and capacitance parameters of the passive filter circuit according to the superimposed voltage amplitude to keep the total shaft voltage amplitude within the safe threshold range.

7. A voltage suppression device, characterized in that, include: The building unit is used to construct a dual-brush grounding topology structure in parallel with the turbine-side grounding carbon brush and the exciter shaft head grounding module; A series unit is used to connect a passive filter circuit consisting of a resistor with a preset resistance value and a capacitor with a preset capacitance value in series in the grounding circuit of the exciter shaft head. The discharge unit is used to directionally discharge the high-frequency pulsating voltage generated during commutation based on the passive filter circuit, forming a low-impedance discharge path for high-frequency current pulses. The adjustment unit is used to reduce the shaft voltage amplitude to a safe threshold range through the coordinated action of the dual-brush grounding topology and the passive filter circuit.

8. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-6.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method according to any one of claims 1-6.

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