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The reconstruction of trigonometric polynomials, a specific class of band limited signals, such as ac signals, from a number of integrated values of input signals is in the focus of this chapter of our monograph. It is widely applied in signal reconstruction, spectral estimation, system identification, as well as in other important signal processing problems. We are proposing a practical and new algorithm...
This chapter of book deals with the problem of estimating the value of the active power of the ac signal in the presence of subharmonics and interharmonics. The method can also be applied analogously for determining the RMS value of basic electrical values. The analysis makes use of the most general model of the voltage and current signal, i.e. the most complex spectral content that can be expected...
Many applications involve digital processing of periodic signals. For example, both voltage and current in electrical utilities are periodic signals containing harmonic components [1–4]. There are generally three steps associated with the digital processing of a signal. First, the signal is uniformly sampled and converted into a discrete sequence. Then, a block of data is constructed by looking at...
The first chapter of this book is dedicated to the problem of measuring basic electric quantities in electric utilities (voltage, current, power, frequency), both from the aspect of accuracy of this type of measurements and the possibilities of simple and practical realization. The conventional algorithms used to this purpose (calculating the active power and the RMS value of the voltage and current...
In real electronic systems, voltage and current signals are not necessarily of a periodical quantity, due to the presence of nonharmonic components or/and possible stochastic variation. This book presents in four chapters methods for analyzing and processing and reconstructing complex signals. The processing of nonharmonic components of ac signals, i.e. interharmonics and subharmonics based on the...
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