Abstract
This paper presents a new recursive discrete-time filter for real-time monitoring of voltage, current, active and reactive power of an electrical/electronic network using a spectral observer. From a signal model comprising a decaying d.c., fundamental and harmonic components, an interpolating spectral observer is constructed to give the desired Fourier coefficients recursively. Initially, a dead beat spectral observer is designed with different sampling rates for the digital instrumentation scheme. Further, the performance of the spectral observer has been studied by placing the poles of the observer at locations other than the origin of the ( Z-plane) complex plane. The fast computational processing capability of this algorithm makes it suitable for microprocessor applications. This digital instrumentation scheme is tested in real-time for a laboratory electrical network using an LSI-11/23, 16-bit microcomputer.
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