A random forest based communication-less approach for protection scheme of six-phase transmission line against shunt, series, evolving and cross-country faults
ELECTRICAL ENGINEERING(2023)
摘要
To meet the rising power demand, it has become mandatory to consider alternative solutions to the existing transmission line framework. Six phase transmission line can be a potential solution due to its ability to transfer 73% more power relative to classical three phase double circuit system. However, due to the increased number of series and shunt faults in the six-phase transmission line, the development of an accurate protection scheme is quite challenging in a six-phase system. Also, because of the larger number of phases, the possibility of non-typical shunt faults, viz. evolving and cross-country faults, are quite high in a six-phase system. Hence, the significance of developing a protection scheme with increased sensitivity against all types of faults (series, shunts, evolving, and cross-country) has become vital for the acceptance of six-phase transmission lines by power utilities. In this regard, a random forest (RF)-based classifier and regression approach have been respectively proposed for the detection/classification and location estimation of all possible faults in a six-phase transmission line. Separate RF classifier modules have been developed for shunt and series faults for detection and classification, followed by further categorization of shunt faults into evolving and cross-country faults. For location estimation, the high dimensional nonlinear mapping characteristics of the Regression Tree (RT) have been utilized. The use of single-end data, avoids the issue of latency and data loss associated with communication assisted protection schemes. The proposed RF-based scheme's efficacy has been tested for various types of typical and non-typical shunt and series faults, with a wide range of fault and power system parameters. The test findings of the RF-based protection illustrate that the protection scheme is resistant to a wide variation in the fault types, fault conditions, extent of nonlinear loading, and noise intrusion.
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关键词
Six phase transmission line,Non-typical shunt faults,Series faults,Discrete wavelet transform (DWT),Random forest (RF),Regression tree (RT)
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