Study on Seismic Reliability of UHVDC Transmission Systems

Yao, Kun; Jia, Qingxuan

doi:10.1155/2019/4131609

Cited by 4 publications

(9 citation statements)

References 12 publications

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“…When the tower model is determined, ωn is also a fixed value. If ωn is regarded as a random variable, according to the traditional method, the number of random variables in the functional function Z will increase at this time, which will lead to changes in the values of μZ and σZ in equation ( 2) [18], which deviates from the given tower the accurate value of eventually causes the reliability R obtained by equation ( 2) to be inaccurate.…”

Section: Vibration Failure Mechanism Of Plug-in Foundation Iron Tower...mentioning

confidence: 99%

The Effect of Soil-Structure Interaction on Vibration Reliability of Transmission Line

Lin¹,

Li²,

Zhen³

et al. 2022

IEEE Access

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Since the main material of the plug-in foundation transmission tower legs is directly connected to the foundation, the traditional reliability calculation method is no longer accurate. For this reason, this paper considers the soil-structure interaction between the foundation soil and the tower legs, replaces the upper limit of the natural circular frequency and frequency ratio of the original iron tower with the corresponding value after considering the SSI (Soil-Structure Interaction), and proposes a SSI-based insertion Analysis method of vibration reliability of type foundation iron tower. First, perform modal analysis to obtain the natural circular frequency of the tower considering SSI; then, according to the external load of the tower under the icing of the wire and the vibration displacement equation of the tower considering SSI, the expression of the comprehensive amplitude amplification factor of the tower is derived, and then the consideration is obtained. The upper limit value of the frequency ratio of SSI and the functional function; finally combined with the normal distribution to solve the problem, the vibration reliability of the plug-in foundation tower considering SSI is obtained. The proposed method has been applied in the analysis of a galloping accident on a line in Guangdong Province. The maximum reliability of the damaged 6-base plug-in foundation tower obtained by this method is 0.9713, which is less than the target reliability of 0.9993.

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Section: Vibration Failure Mechanism Of Plug-in Foundation Iron Tower...mentioning

confidence: 99%

The Effect of Soil-Structure Interaction on Vibration Reliability of Transmission Line

Lin¹,

Li²,

Zhen³

et al. 2022

IEEE Access

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show abstract

“…Significant progress has also been made in the development and application of seismic demand reduction and seismic isolation technology. [12][13][14][15][16][17] Currently, different performance indicators and system modeling approaches have been proposed and applied to evaluate the seismic performance and reliability of a substation, including the success path method, 18 the cut-set method, 19 the binary-state test approach, 20 the enumeration and conditional probability approach, [21][22][23] the fault tree and event tree analysis, 24,25 the graph theory, 26 the integrated sequential flow analysis method 27 as well as the state tree method. 28 Nevertheless, the methods for evaluating the seismic performance of a substation proposed in the literature have the following shortcomings.…”

Section: Introductionmentioning

confidence: 99%

“…2. Existing functionality metrics for a substation, such as the percentage of damaged equipment, 25,30 the percentage of damaged output lines, 22,23,27,28 and whether the predefined load demand of the selected power customer is satisfied, 19,24 are too general since the substation-level redundancy and configuration variations are not accounted for. Furthermore, the relationship between the substation functionality and the percentage of damaged components needs to be further assumed from experience.…”

Section: Introductionmentioning

confidence: 99%

“…Since a substation contains hundreds of electrical equipment components and has a complex topology, it is difficult to obtain a closed form analytical solution of the multiple substation functionality states by considering all potential equipment functionality state combinations. 20,23,24 On the other hand, it is possible to enumerate the equipment…”

Section: Introductionmentioning

confidence: 99%

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Seismic risk analysis of electrical substations based on the network analysis method

Liang

Blagojević

Xie

et al. 2022

Earthq Engng Struct Dyn

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Electrical substations are critical elements of a power grid, enabling the transmission and distribution of electric power from power generators to the end‐users. Experiences from previous earthquakes have shown that electrical substations can be damaged due to ground shaking, reducing their functionality and potentially preventing the generated electric power from reaching end‐users. To assess the seismic vulnerability of a substation, a modular quantitative assessment method is proposed. In this method, the relation between the functionality state of a substation and the damage state of its components was established through the connection matrix technique. A substation is viewed as a network system, whose topology is defined by the connections among various pieces of electrical equipment (i.e., the components), represented in the connection matrix. The maximum allowable power transmission capacity of the substation after an earthquake is adopted as the system functionality metric, which is jointly determined by the power input, transform, and output capacity of the substation. The seismic vulnerability of an electrical substation is quantified by probabilistically calculating its postearthquake functionality when exposed to various earthquake intensities using Monte Carlo sampling. Finally, the risk of substation functionality loss is quantified by integrating the seismic hazard curve with the seismic vulnerability model of the substation. Two realistic case studies on a distribution substation and a transmission substation, with the same equipment configuration but different power delivery paths, were performed using the proposed method. Furthermore, a sensitivity analysis regarding the equipment fragility parameters is conducted, providing a risk‐informed basis for improving the seismic performance of the substation system.

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“…However, the overhead lines of ±800 kV UHVDC transmission lines are very high, the terrain along the longdistance transmission lines is complicate, and it is easy to be disturbed by many natural factors, such as earthquake and lightning [3][4][5]. In order to reduce the probability of direct lightning strike on the transmission lines, the doubleshielded wire is usually used in engineering applications, but it increases the probability of lightning strike on the shielded wire [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influencing Factors of Insulator on the Back-Flashover Lightning Withstand Performance of ±800 kV UHVDC Transmission Lines

Jiang

Chun-lin

Zhou

2020

Mathematical Problems in Engineering

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The current research results indicate that the insulator’s insulation performance has a very important influence on the back-flashover lightning withstand performance of UHVDC transmission lines, especially for ±800 kV voltage level. However, it is not clear which factors will influence the insulation performance of the insulator, and the influencing mechanism is also not clear yet. To figure out this problem, the insulator’s insulation performance under different conditions has been deeply analyzed and considered to reveal the influence mechanism in this paper, such as the surface hydrophobicity, pollution degree, and the string type. Firstly, the insulator’s model is established using COMSOL software, and the lightning impulse voltage of insulator is calculated and verified with the corresponding experimental data. Then, the ±800 kV UHVDC transmission lines model is constructed using PSCAD software, and back-flashover lightning withstand level and back-flashover rate are calculated by considering the above lightning impulse voltage as the threshold of flashover. Finally, the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines is deeply analyzed based on different insulators. The simulation results demonstrate that the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines is obviously weakened with the increase of the pollution degree and slightly weakened with the decrease of the surface hydrophobicity. Considering the same pollution degree, the V-type string insulator has the least influence, while the II-type string insulator has the greatest influences on the back-flashover lightning withstand performance of ±800 kV UHVDC transmission lines. The research results are beneficial for providing theoretical basis for stable operation and reliable power supply of ±800 kV UHVDC transmission lines.

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Study on Seismic Reliability of UHVDC Transmission Systems

Cited by 4 publications

References 12 publications

The Effect of Soil-Structure Interaction on Vibration Reliability of Transmission Line

The Effect of Soil-Structure Interaction on Vibration Reliability of Transmission Line

Seismic risk analysis of electrical substations based on the network analysis method

Study on the Influencing Factors of Insulator on the Back-Flashover Lightning Withstand Performance of ±800 kV UHVDC Transmission Lines

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