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| Main shaft run-out research of hydraulic generator unit in load rejection process based on empirical mode decomposition |
| ZHANG Fei1, FU Jing2, FAN Yulin1, ZHOU Xijun1 |
| 1.Technology Center, State Grid Xinyuan Company Ltd., Beijing 100161, China; 2.Information Center, China Institute of Water Resources and Hydropower Research, Beijing 100044, China |
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Abstract In order to solve the problem of calculating the peak-to-peak value in load rejection conditions, the research on peak-to-peak value differences between stable conditions and transient conditions has been conducted by time-domain wave characteristic analysis. Empirical mode decomposition me-thod was employed for run-out signal analysis in the load rejection process. The result indicates that for load rejection conditions the run-out signal can be decomposed into two different meaningful components. One component is shaft deviation which can be explained as the shaft orbit center stepping from previous stable point to the new stable point; the other component is random-high frequency pulsation. Further research on shaft deviation component shows that it consists of four stages with the speed variations. Accordingly, peak-to-peak value in load rejection mode can be viewed as the summation of peak-to-peak value of high-frequency pulsation and shaft deviation value. Effectiveness has been proved by case in the literature.
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Received: 20 September 2016
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