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This paper presents a hybrid approach to harmonic current compensation in a single-phase variable speed ac drive. The passive filtering is aimed to achieve the total current harmonic distortion after compensation to below 20%. The active filtering is aimed to assist the passive filter to compensate for the residue group harmonic. The active filter employs the sliding window Fourier analysis (SW…
An analytical solution of the transient temperature response in a semi-infinite medium with a line source of finite length has been derived, which is a more appropriate model for boreholes in geothermal heat exchangers, especially for their long-duration operation. The steady-state temperature distribution has also been obtained as a limit of this solution. An erratic approach to this problem t…
Binary-type energy conversion systems are typically used to exploit low-temperature geothermal resources. There are many different technical variations of binary plants, including those known as Organic Rankine Cycles (ORC) and proprietary systems known as Kalina cycles. Recent articles in the technical literature claim dramatic efficiency advantages for Kalina cycles over ORCs, thereby providi…
This paper proposes different methods for estimation of the harmonic currents of the six-pulse diode rectifier, which is a very commonly used topology in industry. Both simple and advanced models are compared and the models are put into a context of practical use for calculating the harmonic distortion in a typical industrial application. Finally, the different models are compared to measuremen…
In this paper, the fractional characteristics of capacitor and inductor are considered, and the single tuned passive harmonic filter is modeled and analyzed based on the fractional calculus. The fractional-order mathematical model of the single tuned passive harmonic filter is given. The difference between the integer model and the fractional model is revealed. In the fractional model the reson…
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