Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

Deng, Yujia; He, Zhengyou; Fu, Ling; Lin, Senshang; Liu, Lei; Zhang, Jiayi

doi:10.1002/tee.22588

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Among them, D m is calculated by (9). It can be known from ( 9) that if the time calibration of both parties is successful, the timer will be turned on and the device will automatically enter the low power consumption mode.…”

Section: Establishment Of Rock Damagementioning

confidence: 99%

“…For example, the frost heave of rock reservoirs in petroleum reservoirs affects the safety of storage tanks and the frozen and expanded cracks of traffic tunnels [5]. e freezing and thawing of rock slopes and even landslides, the construction of railways and highways in high and cold regions, the construction of West-East Gas Pipeline, the construction of Sino-Russian oil and gas pipelines, the construction of many deep tunnels in high and cold regions, and the frost-thrusting of rock foundations due to freezing and thawing are a once-in-a-lifetime opportunity for scholars who study related content [6][7][8][9]. e alternating hot and cold changes in the alpine region have caused the freezing and thawing cycles of the rock mass in the freezing and thawing environment, and the damage has brought extremely serious impacts on a large number of engineering constructions [10].…”

Section: Introductionmentioning

confidence: 99%

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Physical and Mechanical Properties of Transmission Line Galloping under the Action of Freezing and Thawing in Variable Temperature Range

2021

Advances in Civil Engineering

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The western part of our country is mostly alpine regions. The rock and soil have been in a strong natural freeze-thaw environment for a long time, and their physical and mechanical properties are easily affected by external loads and external surroundings. Changes due to the influence of the environment will inevitably produce freeze-thaw cycles, damage and destruction, expansion and fracture, etc., resulting in more stable factors than usual. However, there is a lack of theoretical and practical experience in freeze-thaw rocks, especially freeze-thaw hard rocks. Therefore, studying the physical and mechanical properties and damage characteristics of rocks in alpine regions under freeze-thaw cycles has important significance. This paper uses dacite in the alpine region to carry out a freeze-thaw cycle experiment in a variable temperature range. Freezing and thawing cycle test, uniaxial compression test, triaxial compression test, and electron microscope scanning of the rock in the indoor saturated state were carried out. Combining theory with experimental mechanics, freeze-thaw mechanics, and damage mechanics, we studied freeze-thaw cycle in three variable temperature ranges (−20°C–15°C; −30°C–15°C; −40°C–15°C), along with the physical and mechanical properties and damage characteristics of freeze-thaw dacite in the alpine region under cycling. The damage curve of the final theoretical model gradually approaches 1.0 with the increase of strain during the actual test. The rock sample after the medium failure still has a certain bearing capacity, and the rock sample is often destroyed before it reaches the theoretical failure strain.

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Section: Establishment Of Rock Damagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Transmission Line Galloping under the Action of Freezing and Thawing in Variable Temperature Range

2021

Advances in Civil Engineering

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“…Hybrid systems are more common in real physical systems. Complex systems in which discrete event subsystems interact with continuous variable subsystems are called hybrid dynamic systems [1][2][3][4][5]. Switched system, as classical hybrid dynamic system, has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Memory State Feedback Control for Time-Varying Delay Switched Fuzzy Systems

Zhang

Jia

et al. 2019

Advances in Fuzzy Systems

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Consider the problem of memoryless state feedback controller for time-delay system, which cannot consider both the memoryless and the memory items in the system. Therefore, the memoryless state feedback controller has certain limitations and is more conservative. This paper addresses the memory state feedback control for the time-varying delay switched fuzzy systems based on T-S fuzzy model to overcome the problem discussed above. The state vector and input of the time-varying delay systems contain unknown time-varying delay with known bounds. The designed controller whose parameters are solvable can introduce past state information and reduce the system conservativeness. The more general Lyapunov-Krasovskii functional is selected and the switching law is designed in order to analyze the open-loop system stability, and the memory state feedback controller is designed for the closed-loop system and the criterion for its asymptotic stability. Discuss the solvability of the above two criteria. Finally, a numerical example is given. The simulation results show that the proposed method is more feasible and effective.

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