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Life Estimation Correction Model for Offshore Wind Power Transformer Based on Fault Tree Theory
Zhong Hui,Wang Runze,Zhang Li,Sun Youliang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
The occurrence of fault would greatly afect the remaining life of ofshore wind power transformer. In this paper, the fault events during the operation of the ofshore power transformer were analyzed based on the fault tree theory and the structure function of the transformer fault event was established with considering the operation environment to propose the risk model of transformer fault events. The Monte Carlo method was used to sample the risk model, and the fault risk coefcient of the operation for the ofshore transformer was obtained. Taking the infuence of fault events into the remaining life of the transformer, a Life estimation correction model for ofshore wind power transformer was established, which provides guidance for the optimal design and early fault warning of ofshore transformers.
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Bing Tian,Runze Lu,Kai Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.10
Neutral voltage (NV) reflects the unbalanced condition of a five-phase permanent magnet synchronous motor (PMSM). Thus, it can be used to screen out the open-switch, open-phase, and inter-turn faults of a single phase, with a low rate of misdiagnosis. However, because there is no neutral point lead for most electric drives, the measurement of NV is difficult. To this end, an NV observation method is proposed in this paper by exploiting phase currents and reference pole voltages. This method can be regarded as a kind of multi-sensor information fusion technology. On this basis, a lock-in amplifier technique is further presented to calculate the frequency spectrum from the re-constructed NV, which achieves accurate classification of the stated single-phase faults. Finally, experimental results confirm the validity of the presented method in terms of fast and accurate location determination of open-switch, open-phase, and inter-turn short-circuit faults.
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