CN-121980872-A - Parameter optimization method of vertical auxiliary grounding device and related device

CN121980872ACN 121980872 ACN121980872 ACN 121980872ACN-121980872-A

Abstract

The invention discloses a parameter optimization method of a vertical auxiliary grounding device and a related device, and relates to the technical field of power systems; the method comprises the steps of establishing a simulation model of a grounding device, initializing the simulation model, defining key optimization parameters and a value range of the key optimization parameters, combining the key optimization parameters to obtain first parameter combinations, simulating the first parameter combinations to obtain an impact grounding resistor and current flowing into a grounding body through the simulation model, calculating unit resistance reduction coefficients, resistance reduction rates and shunt duty ratios of the first parameter combinations, screening second parameter combinations based on the shunt duty ratios, constructing response curves of the impact grounding resistor, the unit resistance reduction coefficients and the resistance reduction rates changing along with the key optimization parameters, identifying saturation points, and determining the second parameter combinations which meet constraint conditions and correspond to the saturation points as optimal parameter combinations based on optimization targets. The invention solves the problems that the conventional vertical grounding device depends on empirical design and neglects shielding effect and economy.

Inventors

DONG ZHICONG
ZHOU HENG
LIU JUNYU
FENG BAO
HE JIANQIANG
LI HONGFA
CHENG RUI
CHEN SIJIN
CHEN HAOMING
ZHOU YUPENG
MENG CHENXU
LI XINHAI
WU YIJIANG
LI BEI
ZHANG CHUNMEI
ZENG LINGCHENG
WU MIANTING
LIANG GUOJIAN
ZHANG ZHIQIANG

Assignees

广东电网有限责任公司中山供电局

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (10)

1. The parameter optimization method of the vertical auxiliary grounding device is characterized by comprising the following steps of: Taking the minimum impact grounding resistance and the total length of the grounding body as optimization targets, and setting the impact grounding resistance to meet a preset safety standard value as a constraint condition; Establishing a three-dimensional finite element simulation model comprising a pile foundation structure and a grounding device to be optimized, and defining key optimization parameters and a value range after initializing the three-dimensional finite element simulation model; Combining the key optimization parameters in the value range to obtain a plurality of groups of first parameter combinations, and simulating each first parameter combination through an initialized three-dimensional electromagnetic field simulation model to obtain corresponding impact grounding resistance and current data flowing into a grounding body; according to the impact grounding resistance and the current data, calculating a unit resistance-reduction coefficient, a resistance-reduction rate and a shunt duty ratio corresponding to each group of parameter combinations, and screening a plurality of second parameter combinations from the first parameter combinations based on the shunt duty ratio; And constructing and analyzing a response curve of the impact grounding resistance, the unit resistance-reduction coefficient and the resistance-reduction rate along with the change of each key optimization parameter, identifying a saturation point in the response curve, and determining a second parameter combination which meets the constraint condition and corresponds to the saturation point as an optimal parameter combination based on the optimization target.
2. The method of optimizing parameters of a vertical auxiliary grounding apparatus according to claim 1, wherein the initializing includes setting a soil stratification parameter and a grounding body material property in the three-dimensional finite element simulation model.
3. The method for optimizing parameters of a vertical auxiliary grounding device according to claim 1, wherein the key optimization parameters comprise the number of vertical direct grounding bodies, the length of the vertical direct grounding bodies, the number of turns of the horizontal grounding bodies, the type of vertical direct grounding body materials and the external application range.
4. The method for optimizing parameters of a vertical auxiliary grounding device according to claim 3, wherein in the value range, combining the key optimization parameters to obtain a plurality of groups of first parameter combinations, and simulating each of the first parameter combinations by an initialized three-dimensional electromagnetic field simulation model to obtain corresponding impulse grounding resistance and current data flowing into a grounding body, the method comprises: Changing one or more key optimization parameters in the value range by adopting a control variable method or an orthogonal experiment method to obtain a plurality of groups of first parameter combinations; After standard lightning current is injected into the initialized three-dimensional electromagnetic field simulation model, simulation calculation is carried out on each first parameter combination through the initialized three-dimensional electromagnetic field simulation model, and corresponding impact grounding resistance and current data flowing into the grounding body are obtained.
5. The parameter optimization method of a vertical auxiliary grounding apparatus according to claim 1, wherein the unit drag reduction coefficient is calculated by the following expression: ; In the formula, A drag coefficient is reduced for the unit; The impact grounding resistor is a single pile foundation which is not externally applied and naturally grounded; the grounding resistance under different external application conditions is shown, and L is the length of the grounding body.
6. The method for optimizing parameters of a vertical auxiliary grounding apparatus according to claim 1, wherein the calculation expression of the resistivity is: In the formula, The resistivity is reduced; The impact grounding resistor is a single pile foundation which is not externally applied and naturally grounded; The grounding resistance under different external application conditions.
7. The method for optimizing parameters of a vertical auxiliary grounding apparatus according to claim 1, wherein the calculation expression of the shunt duty ratio is: In the formula, -For the split duty cycle; For the current flowing into the grounding body; is an impulse current.
8. A parameter optimization system for a vertical auxiliary grounding apparatus, comprising: the setting unit is used for taking the minimum impact grounding resistance and the total length of the grounding body as optimization targets at the same time, and setting the impact grounding resistance to meet a preset safety standard value as a constraint condition; the building unit is used for building a three-dimensional finite element simulation model comprising a pile foundation structure and a grounding device to be optimized, and defining key optimization parameters and a value range thereof after initializing; The simulation unit is used for combining the key optimization parameters in the value range to obtain a plurality of groups of first parameter combinations, and simulating each first parameter combination through an initialized three-dimensional electromagnetic field simulation model to obtain corresponding impact grounding resistance and current data flowing into a grounding body; The calculating unit is used for calculating a unit resistance reduction coefficient, a resistance reduction rate and a shunt duty ratio corresponding to each group of parameter combinations according to the impact grounding resistance and the current data, and screening a plurality of second parameter combinations from the first parameter combinations based on the shunt duty ratio; The analysis unit is used for constructing and analyzing a response curve of the impact grounding resistance, the unit resistance-reduction coefficient and the resistance-reduction rate along with the change of each key optimization parameter, identifying a saturation point in the response curve, and determining a second parameter combination which meets the constraint condition and corresponds to the saturation point as an optimal parameter combination based on the optimization target.
9. A parameter optimization apparatus for a vertical auxiliary grounding device, the apparatus comprising a processor and a memory: the memory is used for storing program codes and transmitting the program codes to the processor; The processor is configured to perform the parameter optimization method of the vertical auxiliary grounding apparatus of any one of claims 1-7 according to instructions in the program code.
10. A computer readable storage medium for storing program code for performing the parameter optimization method of the vertical auxiliary grounding apparatus of any one of claims 1-7.

Description

Parameter optimization method of vertical auxiliary grounding device and related device Technical Field The invention relates to the technical field of power systems, in particular to a parameter optimization method of a vertical auxiliary grounding device and a related device. Background Along with the rapid development of ultra-high voltage and ultra-high voltage transmission lines, the requirement on the lightning protection reliability of the lines is increasingly improved. Reducing the ground resistance of the tower is one of the most effective measures to improve the lightning-resistant level of the line. However, in mountain areas, hills, cultivated lands and other areas, the traditional horizontal epitaxial grounding grid has the problems of difficult land characterization, limited construction and the like, the metal grounding body is easy to corrode, and the resistance reducing agent has poor timeliness. In order to solve the problems, the industry begins to utilize the vertical space of a tower foundation, particularly a deep well digging pile foundation, and lay a vertical grounding body around the pile foundation to form a vertical auxiliary grounding device. The method has the advantages of land saving, green, contact with deep low-resistance soil and the like. However, the technology lacks the parameter design guidance of the system at present, and has the following bottleneck that (1) structural parameter defects, such as the number, the length, the arrangement mode and the like of the grounding bodies are determined empirically, so that the optimal balance between the resistance reducing effect and the economy cannot be achieved. (2) The shielding effect defect is that the current shielding effect existing among a plurality of vertical grounding bodies is not quantitatively evaluated, so that the material utilization rate is low, and even the saturation phenomenon of 'additive without resistance reduction' occurs, so that the requirement of construction economy cannot be met. (3) The defect of material selection is that metal materials are still mainly used, corrosion problems are faced, and the application effect and optimization method of new non-metal materials (such as flexible graphite) are lack of research. Therefore, it is desirable to design a method for optimizing parameters of a vertical auxiliary grounding device. Disclosure of Invention The invention provides a parameter optimization method and a related device of a vertical auxiliary grounding device, which are used for solving the problems that the conventional vertical auxiliary grounding device depends on empirical design and ignores shielding effect and economy. In view of this, a first aspect of the present invention provides a parameter optimization method for a vertical auxiliary grounding apparatus, the method comprising: Taking the minimum impact grounding resistance and the total length of the grounding body as optimization targets, and setting the impact grounding resistance to meet a preset safety standard value as a constraint condition; Establishing a three-dimensional finite element simulation model comprising a pile foundation structure and a grounding device to be optimized, and defining key optimization parameters and a value range after initializing the three-dimensional finite element simulation model; Combining the key optimization parameters in the value range to obtain a plurality of groups of first parameter combinations, and simulating each first parameter combination through an initialized three-dimensional electromagnetic field simulation model to obtain corresponding impact grounding resistance and current data flowing into a grounding body; according to the impact grounding resistance and the current data, calculating a unit resistance-reduction coefficient, a resistance-reduction rate and a shunt duty ratio corresponding to each group of parameter combinations, and screening a plurality of second parameter combinations from the first parameter combinations based on the shunt duty ratio; And constructing and analyzing a response curve of the impact grounding resistance, the unit resistance-reduction coefficient and the resistance-reduction rate along with the change of each key optimization parameter, identifying a saturation point in the response curve, and determining a second parameter combination which meets the constraint condition and corresponds to the saturation point as an optimal parameter combination based on the optimization target. Optionally, the initializing comprises setting soil layering parameters and grounding body material properties in the three-dimensional finite element simulation model. Optionally, the key optimization parameters comprise the number of vertical direct grounding bodies, the length of the vertical direct grounding bodies, the number of turns of the horizontal grounding bodies, the type of vertical direct grounding body materials and the external application ran