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In accelerated degradation test, it is essential to establish a suitable degradation path model of the component. In order to predict the life accurately, it is critical to determine the sensitive parameters. A degradation path modeling method based on time series analysis was proposed in this paper. The sensitive parameters were determined by time series stationary test, and a time series ARIMA model was established for the degradation of sensitive parameters. Taking TL431 as an example, the accelerated degradation tests were carried out to investigate the degradation of its performance parameters, and a degradation path model was established for the parameters. The results indicate that the proposed method is feasible for accelerated degradation test.

In order to compensate current harmonic in oil drilling power system, the design, development and experimental investigations of an APF were considered. Based on Fourier transform, a direct harmonic analysis algorithm was designed to identify and track harmonics. Compared with traditional FFT, the proposed algorithm was less dependent on hardware and could be used to for selective harmonic compensation. The laboratory prototype of the APF system was designed and implemented, which was tested in different operating conditions with nonlinear loads to demonstrate its effectiveness and capabilities for harmonic elimination. All experimental results are given and discussed in detail, which validate the proposed APF.