A New Method for Calculation of Transmission Line Tripping Probability Caused by Galloping of Iced Overhead Conductor
The galloping of iced conductors seriously threatens the safety and stability of power systems, so it has become a focus for research to accurately calculate the transmission line tripping probability caused by the galloping of iced conductors. A new tripping probability calculation method is propos...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
State Grid Energy Research Institute
2022-03-01
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| Series: | Zhongguo dianli |
| Subjects: | |
| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202009114 |
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| Summary: | The galloping of iced conductors seriously threatens the safety and stability of power systems, so it has become a focus for research to accurately calculate the transmission line tripping probability caused by the galloping of iced conductors. A new tripping probability calculation method is proposed based on the galloping equation, meterological information and fault information. Firstly, the probability distribution functions of wind speed and frozen rainfall are obtained using their respective historical samples; next, a single-degree-of-freedom galloping model of iced conductors is built according to the Newton law; and then, the Ritz-galerkin method is utilized to solve the galloping model to acquire the analytical expression of the galloping amplitude with the wind speed and icing thickness as independent variables; furthermore, the probability distribution function of icing thickness, which is the function of wind speed and frozen rainfall, is calculated using the probability distribution functions of wind speed and frozen rainfall, and then the probability distribution function of galloping amplitude is also calculated; finally, according to the Poisson distribution obtained by the historical fault records of galloping-caused tripping, the joint probability for the over-limit of galloping amplitude and the short-circuit fault is obtained, and the galloping-caused tripping probability of iced conductors is calculated using the Bayesian formula under the condition of over-limit of galloping amplitude. Case study has proved the effectiveness of the proposed method. |
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| ISSN: | 1004-9649 |