Overvoltage suppression system and method and device for determining overvoltage suppression system

Abstract

The invention discloses an overvoltage suppression system and a method and device for determining the overvoltage suppression system. The system comprises two lightning arresters, and the two lightning arresters are located at one end, close to the station transformer, of a cable between the station transformer and a first circuit breaker in a power station and one end, close to an electric reactor, of a cable between an electric reactor and a second circuit breaker in the power station respectively. The overvoltage suppression device is used for suppressing overvoltage generated at a station transformer and an electric reactor. The technical problem that potential safety hazards are caused due to the fact that an existing overvoltage suppression measure cannot effectively suppress overvoltage in a power station is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to an overvoltage suppression system, and a method and device for determining the overvoltage suppression system. Background Art

[0002] In the power system, the switching operation of 10kV shunt reactor is one of the common system regulation methods, which is mainly used to compensate for the capacitance effect of the transmission line. However, when the vacuum circuit breaker performs the opening and closing operation, especially during the opening process, due to the current interception and arc reignition, an overvoltage with extremely high amplitude frequency will be generated near the reactor. The amplitude of this overvoltage can reach 6.0pu~8.0pu (1p.u. is equal to the rated voltage of the system), which is far more than the maximum allowable operating overvoltage value of 4.0pu in the 10kV system.

[0003] The current overvoltage protection equipment mainly includes lightning arresters and RC absorbers. When lightning arresters are used to suppress operating overvoltages, especially overvoltages with high oscillation frequency and short wave head time, their effect is limited, and they may cause false operation because the volt-ampere characteristic curve is close to the system voltage; although RC absorbers can effectively suppress operating overvoltages, their capacity and resistance heat capacity limit their application under lightning overvoltages or high-amplitude operating overvoltages, and they lack unified design and use standards, making them difficult to be widely used in different voltage levels and occasions. At the same time, current overvoltage protection equipment is generally installed at the busbar of a power station, and has limited effect on suppressing overvoltages.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide an overvoltage suppression system, a determination method and a device for the overvoltage suppression system, so as to at least solve the technical problem that the current overvoltage suppression measures cannot effectively suppress the overvoltage in the power station, thus causing potential safety hazards.

[0006] According to one aspect of an embodiment of the present invention, there is provided an overvoltage suppression system for a power station, comprising two lightning arresters, wherein the two lightning arresters are respectively located at one end of a cable between a station transformer and a first circuit breaker in the power station, close to the station transformer, and at one end of a cable between a reactor and a second circuit breaker in the power station, close to the reactor, for suppressing overvoltages generated at the station transformer and the reactor.

[0007] Optionally, the arrester is a low volt-ampere characteristic arrester, wherein a volt-ampere characteristic curve of the low volt-ampere characteristic arrester is lower than a preset standard volt-ampere characteristic curve.

[0008] According to another aspect of an embodiment of the present invention, a method for determining an overvoltage suppression system is also provided, which is used to determine any of the above-mentioned overvoltage suppression systems, including: setting a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, respectively, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; respectively setting the overvoltage The protection equipment is installed at positions corresponding to each of the preset multiple installation schemes, wherein the overvoltage protection equipment includes at least one of the following: a lightning arrester and a RC absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than the preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than the preset standard volt-ampere characteristic curve; the overvoltage suppression results corresponding to each of the multiple installation schemes are detected respectively, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor; the installation position of the overvoltage protection equipment is determined based on the overvoltage suppression results corresponding to each of the multiple installation schemes; and the overvoltage suppression system is determined according to the installation position.

[0009] Optionally, overvoltage suppression results corresponding to each of the multiple installation schemes are detected respectively, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor, including: detecting and recording multiple overvoltage values ​​at the station transformer and the reactor corresponding to each of the multiple installation schemes, wherein, based on the second circuit breaker, the reactor is connected to the circuit multiple times and cut off from the circuit multiple times to generate multiple overvoltages; the largest overvoltage value among the multiple overvoltage values ​​at the station transformer corresponding to each of the multiple installation schemes is used as the overvoltage amplitude at the station transformer corresponding to each of the multiple installation schemes; the largest overvoltage value among the multiple overvoltage values ​​at the reactor corresponding to each of the multiple installation schemes is used as the overvoltage amplitude at the reactor corresponding to each of the multiple installation schemes.

[0010] Optionally, based on the overvoltage suppression results corresponding to each of the multiple installation schemes, the installation position of the overvoltage protection device is determined, including: judging the relationship between the magnitude of the overvoltage amplitude at the station transformer corresponding to each of the multiple installation schemes and a first preset threshold, and the relationship between the magnitude of the overvoltage amplitude at the reactor and a second preset threshold; selecting the installation scheme corresponding to the overvoltage amplitude at the station transformer being less than the first preset threshold and the overvoltage amplitude at the reactor being less than the second preset threshold as the overvoltage suppression scheme; and determining the installation position of the overvoltage protection device based on the overvoltage suppression scheme.

[0011] Optionally, when there are multiple target installation schemes among multiple installation schemes, and the overvoltage amplitude at the station transformer corresponding to each of the target installation schemes is less than a first preset threshold, and the overvoltage amplitude at the reactor is less than a second preset threshold, the target installation scheme corresponding to the lightning arrester as the overvoltage protection device is selected as the overvoltage suppression scheme.

[0012] According to another aspect of an embodiment of the present invention, a device for determining an overvoltage suppression system is also provided, including: a setting module, used to set a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, respectively, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; an installation module, used to install the overvoltage protection device in a plurality of preset installation positions respectively. At the positions corresponding to each of the schemes, wherein the overvoltage protection equipment includes at least one of the following: a lightning arrester and a RC absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than the preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than the preset standard volt-ampere characteristic curve; a detection module, for respectively detecting the overvoltage suppression results corresponding to each of the multiple installation schemes, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor; a first determination module, for determining the installation position of the overvoltage protection equipment based on the overvoltage suppression results corresponding to each of the multiple installation schemes; a second determination module, for determining the overvoltage suppression system according to the installation position.

[0013] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above-mentioned methods for determining an overvoltage suppression system.

[0014] According to another aspect of the embodiments of the present invention, a computer device is provided. The computer device includes a processor, and the processor is used to run a program. When the program is run, any one of the above-mentioned methods for determining an overvoltage suppression system is executed.

[0015] According to another aspect of the embodiments of the present invention, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, any one of the above-mentioned methods for determining an overvoltage suppression system is implemented.

[0016] In an embodiment of the present invention, an overvoltage suppression system for a power station is adopted, through two lightning arresters, wherein the two lightning arresters are respectively located on one end of the cable between the station transformer and the first circuit breaker in the power station, close to the station transformer, and on one end of the cable between the reactor and the second circuit breaker in the power station, close to the reactor, for suppressing the overvoltage generated at the station transformer and the reactor, thereby achieving the purpose of effectively suppressing the overvoltage at the station transformer and the reactor, thereby realizing the technical effect of protecting power equipment from overvoltage damage and improving the stability and safety of power station operation, thereby solving the technical problem that the current overvoltage suppression measures cannot effectively suppress the overvoltage in the power station, causing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a schematic structural diagram of an overvoltage suppression system provided according to an embodiment of the present invention;

[0019] Figure 2 is a comparison diagram of the volt-ampere characteristic curves of the lightning arrester provided according to an optional embodiment of the present invention;

[0020] Figure 3 A hardware structure block diagram of a computer terminal for implementing a determination method of an overvoltage suppression system is shown;

[0021] Figure 4 is a flow chart of a method for determining an overvoltage suppression system provided in an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of an installation position provided according to an optional embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of the appearance of a lightning arrester provided according to an optional embodiment of the present invention;

[0024] Figure 7is a schematic diagram of the appearance of a resistor-capacitor absorber provided according to an optional embodiment of the present invention;

[0025] Figure 8 is a voltage simulation waveform of the reactor and the station transformer when there is no suppression measure provided in an embodiment of the present invention;

[0026] Fig. 9 : are voltage simulation waveforms under four configuration conditions provided by an optional embodiment of the present invention;

[0027] Fig.10 is a three-phase voltage waveform diagram at the reactor when the switch is opened according to the scheme three and the scheme four provided in the optional embodiment of the present invention;

[0028] Fig.11 It is a three-phase voltage waveform diagram at the station transformer when the switch is opened in scheme three and scheme four provided in an optional embodiment of the present invention;

[0029] Fig.12 4 is a structural block diagram of a determination device of an overvoltage suppression system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] According to an embodiment of the present invention, an overvoltage suppression system embodiment is provided. Figure 1 is a schematic diagram of the structure of an overvoltage suppression system provided according to an embodiment of the present invention. Figure 1As shown, the system includes two lightning arresters, wherein the two lightning arresters are respectively located at one end of the cable between the station transformer and the first circuit breaker in the power station, close to the station transformer, and at one end of the cable between the reactor and the second circuit breaker in the power station, close to the reactor, for suppressing overvoltage generated at the station transformer and the reactor.

[0033] Optionally, when the second circuit breaker switches the reactor, because the interruption and reignition are often accompanied by an overvoltage with extremely high amplitude and frequency, it is necessary to set up an overvoltage suppression system in the power station to reduce the impact of the overvoltage. Among them, the overvoltage can include the interruption overvoltage, the reignition overvoltage and the three-phase simultaneous breaking overvoltage. The interruption overvoltage is the interruption of the second circuit breaker, that is, before the current reaches the zero point, the arc becomes unstable, resulting in the current being forcibly interrupted. The reignition overvoltage is the overvoltage caused by the arc reignition due to the insulation strength recovery capacity at the break being lower than the transient recovery voltage on the load side of the interruption when the second circuit breaker is performing the breaking action. The three-phase simultaneous breaking overvoltage is the overvoltage caused by the multiple reignitions that may occur simultaneously in the three phases after the virtual interruption.

[0034] The current overvoltage protection devices mainly include lightning arresters and RC absorbers, and the two have different overvoltage suppression principles. Among them, the lightning arrester is essentially a discharger, which is connected in parallel near the protected equipment. When the applied voltage exceeds the discharge voltage of the lightning arrester, the lightning arrester discharges first, thereby limiting the development of overvoltage and protecting the equipment from insulation breakdown. For example, zinc oxide lightning arresters are widely used in the field of overvoltage protection of power systems due to their excellent nonlinear characteristics. The lightning arrester installed on the cable between the station transformer and the first circuit breaker, and close to one end of the station transformer, can ensure that the lightning arrester can respond quickly when the restrike overvoltage or the reflected overvoltage caused by the wave impedance difference affects the station transformer, limit the amplitude of the overvoltage, and protect the station transformer from damage by high-energy overvoltage. The lightning arrester installed on the cable between the reactor and the second circuit breaker, and close to one end of the reactor, directly targets the overvoltage problem of the reactor. Before the transient overvoltage traveling wave generated at the reactor arrives, it can quickly discharge energy through its nonlinear volt-ampere characteristics, reduce the amplitude of the overvoltage, and thus reduce the insulation threat to the reactor and its connected equipment.

[0035] By precisely installing arresters at the ends of the cables at the station transformer and reactor, localized overvoltage protection can be achieved. One arrester is dedicated to protecting the station transformer, while the other arrester directly serves the reactor. This dual protection mechanism ensures that when an overvoltage occurs at either end, the corresponding arrester responds quickly, limiting the spread of the overvoltage and reducing its damage to system equipment.

[0036] As an optional embodiment, the arrester is a low volt-ampere characteristic arrester, wherein the volt-ampere characteristic curve of the low volt-ampere characteristic arrester is lower than a preset standard volt-ampere characteristic curve.

[0037] Optionally, the volt-ampere characteristic curve describes the current response characteristics of the arrester under different voltages. Figure 2 is a comparison diagram of the volt-ampere characteristic curve of the lightning arrester provided according to an optional embodiment of the present invention, such as Figure 2 As shown in the figure, the characteristic of low volt-ampere characteristic arrester is that the voltage at the turning point of its volt-ampere characteristic curve is lower than that of standard arrester, which means that at a relatively low voltage level, the low volt-ampere characteristic arrester can start, quickly respond and discharge overvoltage energy, thereby limiting the peak value of overvoltage. Therefore, the arrester can limit the overvoltage amplitude, and the lower the volt-ampere characteristic, the better the suppression effect.

[0038] According to an embodiment of the present invention, an embodiment of a method for determining an overvoltage suppression system is also provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0039] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 3 The hardware structure block diagram of a computer terminal for implementing a determination method of an overvoltage suppression system is shown. Figure 3 As shown, the computer terminal 30 may include one or more (302a, 302b, ..., 302n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 304 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 3 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 3 More or fewer components as shown, or with Figure 3 Different configurations shown.

[0040] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 30. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0041] The memory 304 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the determination method of the overvoltage suppression system in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 304, that is, the determination method of the overvoltage suppression system of the above-mentioned application program is realized. The memory 304 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 304 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 30 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0042] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 30 .

[0043] Figure 4 FIG. 1 is a flow chart of a method for determining an overvoltage suppression system according to an embodiment of the present invention. Figure 4 As shown, the method comprises the following steps:

[0044] Step S401, setting a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, respectively, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker.

[0045] In this step, Figure 5 is a schematic diagram of the installation position provided according to an optional embodiment of the present invention, such as Figure 5As shown, a is the second position, b is the first position, c is the fourth position, and d is the third position. The first position is set on the cable between the station transformer and the first circuit breaker, specifically at one end close to the station transformer, with the purpose of directly protecting the station transformer from overvoltage shock. The second position is set on the cable between the station transformer and the first circuit breaker, close to one end of the first circuit breaker. Although the second position does not directly protect the station transformer like the first position, it is equally important. During the opening process, the overvoltage may be caused by the circuit breaker operation and propagate toward the station transformer. Installing the protection device at the second position can effectively intercept the overvoltage on this propagation path, reduce the intensity of the overvoltage propagation to the station transformer, and thus provide an additional level of protection. The third position is set on the cable between the reactor and the second circuit breaker, specifically at one end close to the reactor, which can directly protect the reactor and reduce the impact of the reignition and pre-strike through-voltage at the reactor. The fourth position is located on the cable between the reactor and the second circuit breaker, close to one end of the second circuit breaker. Similar to the third position, the setting of the fourth position can provide additional protection for the reactor, especially when overvoltage energy propagates from the circuit breaker to the reactor.

[0046] Step S402, respectively install the overvoltage protection devices at positions corresponding to the respective preset multiple installation schemes, wherein the overvoltage protection devices include at least one of the following: a lightning arrester and a RC absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than the preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than the preset standard volt-ampere characteristic curve.

[0047] In this step, the overvoltage protection devices that can be used include lightning arresters and RC absorbers. Among them, the lightning arresters can include low volt-ampere characteristic lightning arresters and high volt-ampere characteristic lightning arresters, and the lower the volt-ampere characteristic of the lightning arrester, the better the suppression effect. The electrical structure of the RC absorber is relatively simple, and each phase is an equivalent series circuit of capacitors and resistors. The RC absorber is usually connected in parallel to the line, thereby changing the high-frequency oscillation circuit structure. On the one hand, its absorption capacitor can effectively reduce the oscillation frequency of the overvoltage, and on the other hand, it can also share part of the overvoltage, and can suppress the amplitude and steepness of the overvoltage at the same time, while the absorption resistor can accelerate the attenuation of the capacitor oscillation, so that the voltage value on the equipment is rapidly reduced to zero. The RC absorber achieves the purpose of protecting the system by absorbing and consuming the energy of the overvoltage, while the lightning arrester quickly releases the overvoltage energy to limit its amplitude. The difference in the principles of the two determines that there are certain differences in their protection effects, and the factors affecting their effects are also different. For example, Figure 6 is a schematic diagram of the appearance of a lightning arrester provided according to an optional embodiment of the present invention, such as Figure 6As shown, the parameters of the high volt-ampere characteristic arrester can be 17 / 45kV, and the parameters of the low volt-ampere characteristic arrester can be 12 / 32.4kV. Figure 7 is a schematic diagram of the appearance of a resistor-capacitor absorber provided according to an optional embodiment of the present invention, such as Figure 7 As shown, the parameters of the RC absorber can be 100Ω and 0.10μF.

[0048] In addition, multiple installation schemes can be set according to different actual needs. In order to obtain the best protection effect, multiple installation schemes can be set based on the control variable method. For example, a total of five different schemes can be set for comparing different effects, including the first scheme, the second scheme, the third scheme, the fourth scheme and the fifth scheme, wherein the first scheme is to install a high volt-ampere characteristic arrester at the first position and the third position respectively, the second scheme is to install a high volt-ampere characteristic arrester at the third position and the fourth position respectively, the third scheme is to install a low volt-ampere characteristic arrester at the first position and the third position respectively, the fourth scheme is to install a resistor-capacitor absorber at the third position, and the fifth scheme is to install a resistor-capacitor absorber at the first position and the third position respectively.

[0049] By testing these multiple installation schemes, the overvoltage suppression effects of arresters and RC absorbers under different configurations can be evaluated in detail, including changes in key parameters such as overvoltage amplitude, oscillation frequency, rising steepness, and the risk of malfunction of the equipment. Finally, the most reasonable overvoltage suppression scheme is determined by combining experimental data and theoretical analysis. Each scheme has its design purpose and expected effect, and the final selected scheme is the optimal decision made based on actual needs and protection effects after comprehensively evaluating and comparing all schemes.

[0050] Step S403 , respectively detecting overvoltage suppression results corresponding to the plurality of installation schemes, wherein the overvoltage suppression results include an overvoltage amplitude at the station transformer and an overvoltage amplitude at the reactor.

[0051] In this step, in order to accurately evaluate the overvoltage suppression effect, the detection process needs to accurately measure the overvoltage amplitude at the station transformer and the reactor after each scheme is implemented. This measurement can be completed by professional high-voltage test equipment and sensors to ensure the accuracy and reliability of the data. Specifically, during the operation of the vacuum circuit breaker switching on and off the shunt reactor, the voltage waveform at the station transformer and the reactor is monitored in real time, the overvoltage waveform data is collected, and the key parameters such as the amplitude, frequency and duration of the overvoltage are determined by the waveform analysis software. The obtained overvoltage amplitudes are compared with each other and compared with the baseline data when there are no overvoltage suppression measures to evaluate the suppression effect of each scheme.

[0052] Step S404: determining the installation location of the overvoltage protection device based on the overvoltage suppression results corresponding to each of the plurality of installation schemes.

[0053] In this step, the overvoltage suppression results under all installation schemes can be compared, considering the volt-ampere characteristics of the lightning arrester, the capacitance value of the RC absorber, and their respective suppression effects at different locations, while taking into account their impact on system safety and operating costs, and finally determining the optimal overvoltage protection device installation location.

[0054] Step S405: determining an overvoltage suppression system according to the installation location.

[0055] In this step, determining the configuration of the overvoltage suppression system, especially the installation location of the overvoltage protection device, is a key step to ensure the safe operation of the power system. The reasonable location layout of the lightning arrester and the RC absorber can be used to achieve effective protection of the system equipment while taking into account the safe operation and economy of the system. The determination of this system configuration is the cornerstone of this embodiment applied to the power system, and provides a strong technical guarantee for the safe and stable operation of the power system.

[0056] As an optional embodiment, before implementing the above-mentioned determination method of the overvoltage suppression system, a simulation test can also be performed. Specifically, the influence of the difference in the volt-ampere characteristics of the lightning arrester on the suppression effect can be explored through the simulation test, and two lightning arresters can be selected, one is a lightning arrester with a higher than normal volt-ampere characteristic curve, and the other is a lightning arrester with a lower than normal volt-ampere characteristic curve. Figure 8 : is a voltage simulation waveform of the reactor and the station transformer when there is no suppression measure provided by the embodiment of the present invention, such as Figure 8 As shown, the amplitudes are 65.14kV (7.60pu) and 52.46kV (6.12pu) respectively. By changing the installation position of the arrester and comparing the simulation results, the analysis results can be obtained. For example, during the reignition period, the amplitude of the overvoltage of the opening switch is limited by the nonlinearity of the arrester and the insulation strength of the break, while the overvoltage of the opening switch after the reignition is only limited by the nonlinearity of the arrester. The lower the volt-ampere characteristic curve, the stronger the suppression effect. For another example, the installation position affects the overvoltage suppression effect. At position d, its suppression effect on the reactor is outstanding; at position b, its suppression effect on the station transformer is outstanding, which is in line with the principle of releasing overvoltage energy nearby. A single arrester can only limit the overvoltage at a certain location. In order to limit the reactor voltage and the station transformer voltage at the same time, two low volt-ampere characteristic arresters need to be installed at positions b and d at the same time.

[0057] In addition, the influence of the RC absorber on the overvoltage can also be explored. Specifically, the RC absorber can be installed at positions a, b, c and d respectively to obtain simulation results and analytical conclusions. For example, in general, the RC absorber has a good suppression effect on the amplitude of the overvoltage caused by the gate opening and re-ignition. Its access changes the high-frequency oscillation circuit, so that the time constant τ=RC of the high-frequency current increases, the current zero-crossing time is extended, and the contact opening distance increases, thereby reducing the probability of re-ignition, suppressing the development of overvoltage, and limiting the amplitude of overvoltage. For another example, in a vertical comparison, the capacitance value directly affects the suppression effect of overvoltage. The capacitance value is positively correlated with the strength of the suppression effect and there is a saturation effect. Due to process limitations, it is difficult to meet the requirements of small volume and large capacitance at the same time. Therefore, a RC absorber of 0.10μF / 100Ω can be selected. For another example, in a horizontal comparison, the installation position affects the suppression effect. When a single RC absorber is installed at positions a and b, it is difficult to suppress the reactor voltage, while when it is installed at positions c and d, it can suppress the reactor voltage and the station transformer voltage at the same time, and there is a better suppression effect at this time.

[0058] The influence of lightning arresters and RC absorbers on lightning can also be explored. In order to compare the lightning protection effects of RC and MOA, the lightning overvoltage waveform, amplitude, and frequency response under four different configuration conditions can be calculated: no RC and lightning arrester, only RC, only lightning arrester, and RC and lightning arrester. Fig. 9 ] are voltage simulation waveforms under four configuration conditions provided by an optional embodiment of the present invention, such as Fig. 9 As shown. The R value of the RC absorber is set to 100Ω, and the C value is set to 0.1μF. If the RC absorber and the arrester are used together, the effect is better than installing only one. After the overvoltage protection device is connected to the power station, the capacitor reduces the loop oscillation frequency, the damping resistor makes the amplitude decay rapidly, and the low-resistance current clipping effect of the arrester under overvoltage can effectively reduce the probability of insulation breakdown. This protection configuration combines the advantages of the RC absorber and the arrester, and can have a stronger inhibitory effect on lightning overvoltage.

[0059] Through the above steps, the purpose of effectively suppressing overvoltage at the station transformer and reactor is achieved, thereby achieving the technical effect of protecting power equipment from overvoltage damage and improving the stability and safety of power station operation, thereby solving the technical problem that the current overvoltage suppression measures cannot effectively suppress overvoltage in the power station, causing safety hazards.

[0060] As an optional embodiment, overvoltage suppression results corresponding to each of the multiple installation schemes are detected respectively, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor, including: detecting and recording multiple overvoltage values ​​at the station transformer and the reactor corresponding to each of the multiple installation schemes, wherein, based on the second circuit breaker, the reactor is connected to the circuit multiple times and cut off from the circuit multiple times to generate multiple overvoltages; the largest overvoltage value among the multiple overvoltage values ​​at the station transformer corresponding to each of the multiple installation schemes is used as the overvoltage amplitude at the station transformer corresponding to each of the multiple installation schemes; the largest overvoltage value among the multiple overvoltage values ​​at the reactor corresponding to each of the multiple installation schemes is used as the overvoltage amplitude at the reactor corresponding to each of the multiple installation schemes.

[0061] Optionally, for each scheme, the reactor can be connected and disconnected from the circuit multiple times based on the operation of the second circuit breaker. Through the opening and closing actions of the circuit breaker, the overvoltage effect generated at the reactor and the station transformer can be observed. Since the opening operation of the second circuit breaker may cause the cutoff to reignite, thereby generating an overvoltage with extremely high amplitude and frequency, these operations provide practical data support for testing the effects of different protection devices. At the reactor and the station transformer, high-precision voltage sensors and data recording equipment are used to detect and record the overvoltage value generated by each operation. Since the generation of overvoltage in the power system is random, multiple operations can provide more comprehensive data, which helps to evaluate the stability and reliability of different schemes. The recorded overvoltage values ​​are used for subsequent statistical analysis, including key parameters such as the amplitude, oscillation frequency and rising steepness of the overvoltage. For each installation scheme, all overvoltage values ​​measured at the station transformer and the reactor are summarized. In each group of overvoltage values, the maximum overvoltage value is identified and recorded, and this maximum value is determined as the overvoltage amplitude at the corresponding position under the installation scheme. In this way, the protection effects of different schemes in the face of extreme overvoltage conditions can be intuitively compared.

[0062] As an optional embodiment, the installation position of the overvoltage protection device is determined based on the overvoltage suppression results corresponding to each of multiple installation schemes, including: judging the relationship between the magnitude of the overvoltage amplitude at the station transformer corresponding to each of the multiple installation schemes and a first preset threshold, and the relationship between the magnitude of the overvoltage amplitude at the reactor and a second preset threshold; selecting the installation scheme corresponding to the overvoltage amplitude at the station transformer being less than the first preset threshold and the overvoltage amplitude at the reactor being less than the second preset threshold as the overvoltage suppression scheme; and determining the installation position of the overvoltage protection device based on the overvoltage suppression scheme.

[0063] Optionally, two preset thresholds can be set, namely, a first preset threshold (for the overvoltage amplitude at the station transformer) and a second preset threshold (for the overvoltage amplitude at the reactor). These two thresholds are set based on the insulation level, operational safety and system standards of the power system equipment, and are intended to ensure that the system is not threatened by overvoltage under various operating conditions. The maximum overvoltage amplitude at the station transformer and the reactor of each installation scheme is compared with the preset threshold. A scheme is considered to be an effective overvoltage suppression scheme only when the overvoltage amplitude at both locations (station transformer and reactor) is lower than the corresponding preset threshold. Once the optimal overvoltage suppression scheme is determined, the next step is to determine the specific installation location of the overvoltage protection device (such as a lightning arrester or a resistor-capacitor absorber) according to the requirements of the scheme.

[0064] As an optional embodiment, when there are multiple target installation schemes among multiple installation schemes, and the overvoltage amplitude at the station transformer corresponding to each of the target installation schemes is less than a first preset threshold, and the overvoltage amplitude at the reactor is less than a second preset threshold, the target installation scheme corresponding to the lightning arrester in which the overvoltage protection device is selected is the overvoltage suppression scheme.

[0065] Optionally, two preset thresholds can be set according to the operation standards and safety requirements of the power system, namely, a first preset threshold of overvoltage at the station transformer and a second preset threshold of overvoltage at the reactor. Schemes with amplitudes lower than the first preset threshold and the second preset threshold are preliminarily identified as target installation schemes because they can effectively control overvoltage and meet the requirements for safe operation of the system. Among all target installation schemes, the difference in the effects of lightning arresters and RC absorbers is further analyzed. Considering the advantages of lightning arresters in limiting overvoltage amplitudes and the potential safety hazards of RC absorbers, such as the risk of explosion caused by insufficient capacitance, the target installation scheme corresponding to the lightning arrester is preferentially selected as the overvoltage suppression scheme. The lightning arrester can respond quickly to overvoltage events and limit the overvoltage amplitude through its nonlinear characteristics without worrying about energy absorption. Therefore, while meeting the system overvoltage protection requirements, the lightning arrester scheme provides a more direct, stable and safer protection method.

[0066] For example, in the comparison of the results of the five possible installation schemes mentioned above, comparing Scheme 2 with Scheme 1, Scheme 2 failed to effectively suppress the overvoltage of the station transformer, and the lightning arrester could only limit the overvoltage near the installation location; comparing Scheme 3 with Scheme 1, it can be seen that the overvoltage at the reactor and the station transformer are both limited, and the 12 / 32.4kV lightning arrester has a better suppression effect than the 17 / 45kV lightning arrester, and the latter has a lower voltage than the reactor and station transformer of the former; comparing Scheme 4 with other schemes, the RC absorber installed at the end of the cable at the reactor can well suppress the overvoltage amplitudes at the two locations, and at this time a single RC absorber already has a good suppression effect.

[0067] Fig.10 is a three-phase voltage waveform diagram at the reactor when the switch is opened according to the scheme three and the scheme four provided in the optional embodiment of the present invention, Fig.11 It is a three-phase voltage waveform diagram at the station transformer when the switch is opened according to the scheme three and scheme four provided by the optional embodiment of the present invention. As shown in the figure, it can be seen that the three phases of the transient waveforms at these two places have multiple high-frequency attenuation oscillations. In addition, by comparing the amplified waveforms, it can be seen that the reignition degree under scheme three is much more severe than that under scheme four. However, the RC absorber itself has no protection margin. When the overvoltage amplitude is high, the residual voltage is high, which poses a safety hazard. It cannot protect against lightning overvoltage and operating overvoltage with excessive amplitude. Therefore, even if the effect of scheme four is slightly better than that of scheme three, scheme three is still selected as the suppression scheme, that is, 12 / 32.4kV lightning arresters are installed at the ends of the cables at the station transformer and the reactor at the same time. Although the lower volt-ampere characteristic is prone to false operation, considering that the number of reactive switching times in the 10kV system is relatively large, it is necessary to appropriately reduce the number of overvoltages and reduce the damage to insulation caused by the cumulative effect. At the same time, this type of lightning arrester can also meet the needs of the system to operate under normal conditions and when the power frequency voltage rises.

[0068] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0069] Through the description of the above implementation methods, those skilled in the art can clearly understand that the determination method of the overvoltage suppression system according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0070] According to an embodiment of the present invention, a device for implementing the above-mentioned determination method of the overvoltage suppression system is also provided. Fig.12 is a structural block diagram of a determination device of an overvoltage suppression system provided according to an embodiment of the present invention, such as Fig.12 As shown, the device includes: a setting module 1201, an installation module 1202, a detection module 1203, a first determination module 1204 and a second determination module 1205. The device is described below.

[0071] Setting module 1201 is used to set a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, respectively, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker.

[0072] The installation module 1202 is connected to the setting module 1201, and is used to install the overvoltage protection device at the positions corresponding to each of the preset multiple installation schemes, wherein the overvoltage protection device includes at least one of the following: a lightning arrester and a resistor-capacitor absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than the preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than the preset standard volt-ampere characteristic curve.

[0073] The detection module 1203 is connected to the installation module 1202, and is used to respectively detect the overvoltage suppression results corresponding to the multiple installation schemes, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor.

[0074] The first determination module 1204 is connected to the detection module 1203 and is used to determine the installation position of the overvoltage protection device based on the overvoltage suppression results corresponding to each of the multiple installation schemes.

[0075] The second determination module 1205 is connected to the first determination module 1204 and is used to determine the overvoltage suppression system according to the installation location.

[0076] It should be noted that the above-mentioned setting module 1201, installation module 1202, detection module 1203, first determination module 1204 and second determination module 1205 correspond to steps S401 to S405 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment. It should be noted that the above-mentioned modules as part of the device can be run in the computer terminal 30 provided in the embodiment.

[0077] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one network device among multiple network devices of a computer network. The computer device includes a memory and a processor.

[0078] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the determination method and device of the overvoltage suppression system in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, the determination method of the overvoltage suppression system described above is realized. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0079] The processor can call the information and application program stored in the memory through the transmission device to perform the following steps: respectively set a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; respectively install the overvoltage protection device at the preset At positions corresponding to multiple installation schemes, wherein the overvoltage protection device includes at least one of the following: a lightning arrester and a RC absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than a preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than a preset standard volt-ampere characteristic curve; respectively detecting overvoltage suppression results corresponding to each of the multiple installation schemes, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor; determining the installation position of the overvoltage protection device based on the overvoltage suppression results corresponding to each of the multiple installation schemes; and determining the overvoltage suppression system according to the installation position.

[0080] According to the embodiment of the present invention, an overvoltage suppression system for a power station is adopted, through two lightning arresters, wherein the two lightning arresters are respectively located on one end of a cable between a station transformer and a first circuit breaker in the power station, close to the station transformer, and on one end of a cable between a reactor and a second circuit breaker in the power station, close to the reactor, for suppressing overvoltages generated at the station transformer and at the reactor, thereby achieving the purpose of effectively suppressing overvoltages at the station transformer and the reactor, thereby realizing the technical effect of protecting power equipment from overvoltage damage and improving the stability and safety of power station operation, thereby solving the technical problem that current overvoltage suppression measures cannot effectively suppress overvoltages in power stations, causing safety hazards.

[0081] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0082] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the determination method of the overvoltage suppression system provided by the above embodiment.

[0083] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: respectively setting a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; respectively installing the overvoltage protection device at the pre- At positions corresponding to multiple installation schemes, the overvoltage protection equipment includes at least one of the following: an arrester and a RC absorber, the arrester includes a low volt-ampere characteristic arrester and a high volt-ampere characteristic arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic arrester is lower than a preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic arrester is higher than a preset standard volt-ampere characteristic curve; respectively detect the overvoltage suppression results corresponding to the multiple installation schemes, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor; determine the installation position of the overvoltage protection equipment based on the overvoltage suppression results corresponding to the multiple installation schemes; and determine the overvoltage suppression system according to the installation position.

[0085] An embodiment of the present invention further provides a computer program product, including a computer program. Optionally, in this embodiment, when the computer program is executed by a processor, it can achieve: setting a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, respectively, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; respectively placing the overcurrent The overvoltage protection device is installed at a position corresponding to each of the preset multiple installation schemes, wherein the overvoltage protection device includes at least one of the following: a lightning arrester and a RC absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than the preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than the preset standard volt-ampere characteristic curve; the overvoltage suppression results corresponding to each of the multiple installation schemes are detected respectively, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor; based on the overvoltage suppression results corresponding to each of the multiple installation schemes, the installation position of the overvoltage protection device is determined; according to the installation position, the overvoltage suppression system is determined.

[0086] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0087] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0089] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0090] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0091] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An overvoltage suppression system for a power station, characterized in that: Includes two lightning arresters, of which, The two lightning arresters are respectively located on one end of the cable between the station transformer and the first circuit breaker in the power station, close to the station transformer, and on one end of the cable between the reactor and the second circuit breaker in the power station, close to the reactor, and are used to suppress overvoltage generated at the station transformer and the reactor.

2. The system according to claim 1, characterized in that The arrester is a low volt-ampere characteristic arrester, wherein the volt-ampere characteristic curve of the low volt-ampere characteristic arrester is lower than a preset standard volt-ampere characteristic curve.

3. A method for determining an overvoltage suppression system, characterized in that: The overvoltage suppression system according to any one of claims 1 to 2 comprises: A first position, a second position, a third position and a fourth position are respectively set on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; The overvoltage protection devices are respectively installed at positions corresponding to the preset multiple installation schemes, wherein the overvoltage protection devices include at least one of the following: a lightning arrester and a resistor-capacitor absorber, the lightning arrester includes a low volt-ampere characteristic lightning arrester and a high volt-ampere characteristic lightning arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic lightning arrester is lower than the preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic lightning arrester is higher than the preset standard volt-ampere characteristic curve; Respectively detecting overvoltage suppression results corresponding to each of the plurality of installation schemes, wherein the overvoltage suppression results include an overvoltage amplitude at the station transformer and an overvoltage amplitude at the reactor; Determining the installation location of the overvoltage protection device based on the overvoltage suppression results corresponding to each of the multiple installation schemes; The overvoltage suppression system is determined according to the installation location.

4. The method according to claim 3, characterized in that The respectively detecting the overvoltage suppression results corresponding to the multiple installation schemes, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor, comprises: Detecting and recording the values ​​of multiple overvoltages at the station transformer and the reactor corresponding to each of the multiple installation schemes, wherein the reactor is connected to the circuit and disconnected from the circuit multiple times based on the second circuit breaker to generate the multiple overvoltages; The maximum overvoltage value among the multiple overvoltage values ​​at the station transformer corresponding to each of the multiple installation schemes is used as the overvoltage amplitude at the station transformer corresponding to each of the multiple installation schemes; The maximum overvoltage value among the multiple overvoltage values ​​at the reactor corresponding to each of the multiple installation schemes is used as the overvoltage amplitude at the reactor corresponding to each of the multiple installation schemes.

5. The method according to claim 3, characterized in that: The step of determining the installation position of the overvoltage protection device based on the overvoltage suppression results corresponding to each of the plurality of installation schemes includes: Determine the magnitude relationship between the magnitude of the overvoltage amplitude at the station transformer corresponding to each of the plurality of installation schemes and a first preset threshold, and the magnitude relationship between the magnitude of the overvoltage amplitude at the reactor and a second preset threshold; Selecting an installation scheme corresponding to the overvoltage amplitude at the station transformer being less than the first preset threshold and the overvoltage amplitude at the reactor being less than the second preset threshold as an overvoltage suppression scheme; Based on the overvoltage suppression scheme, an installation location of the overvoltage protection device is determined.

6. The method according to claim 5, characterized in that When there are multiple target installation schemes among the multiple installation schemes, and the overvoltage amplitude at the station transformer corresponding to each of them is less than the first preset threshold, and the overvoltage amplitude at the reactor is less than the second preset threshold, the target installation scheme corresponding to the overvoltage protection device being the lightning arrester is selected as the overvoltage suppression scheme.

7. A determination device for an overvoltage suppression system, characterized in that: include: A setting module, used to set a first position, a second position, a third position and a fourth position on the cable between the station transformer and the first circuit breaker and the cable between the reactor and the second circuit breaker, respectively, wherein the first position is an end of the cable between the station transformer and the first circuit breaker close to the station transformer, the second position is an end of the cable between the station transformer and the first circuit breaker close to the first circuit breaker, the third position is an end of the cable between the reactor and the second circuit breaker close to the reactor, and the fourth position is an end of the cable between the reactor and the second circuit breaker close to the second circuit breaker; An installation module, used to install the overvoltage protection device at positions corresponding to the preset multiple installation schemes, respectively, wherein the overvoltage protection device includes at least one of the following: an arrester and a resistor-capacitor absorber, the arrester includes a low volt-ampere characteristic arrester and a high volt-ampere characteristic arrester, the volt-ampere characteristic curve of the low volt-ampere characteristic arrester is lower than a preset standard volt-ampere characteristic curve, and the volt-ampere characteristic curve of the high volt-ampere characteristic arrester is higher than the preset standard volt-ampere characteristic curve; A detection module, used to respectively detect the overvoltage suppression results corresponding to the multiple installation schemes, wherein the overvoltage suppression results include the overvoltage amplitude at the station transformer and the overvoltage amplitude at the reactor; A first determination module, configured to determine an installation position of the overvoltage protection device based on the overvoltage suppression results corresponding to each of the plurality of installation schemes; The second determination module is used to determine the overvoltage suppression system according to the installation location.

8. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the determination method of the overvoltage suppression system according to any one of claims 3 to 6.

9. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is running, the processor executes the determination method of the overvoltage suppression system according to any one of claims 3 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for determining the overvoltage suppression system according to any one of claims 3 to 6 is implemented.

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