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Phase-orthogonal FIR filter based reactive power measurement for power meters

TitlePhase-orthogonal FIR filter based reactive power measurement for power meters
Publication TypeJournal Article
Year of Publication2021
AuthorsDuraiswamy, P, Selvaraja, SKumar
JournalAnalog Integrated Circuits and Signal Processing

In filter based reactive power measurements, the voltage is phase shifted by relative to the current. This paper presents a technique of measuring reactive power based on differential shifter. According to this method, the sampled voltage and the current signal passes through a pair of FIR filters that shifts and . Then, the two outputs are multiplied to measure the reactive power. A pair of FIR filters that are having identical flat magnitude responses and orthogonal phase responses are designed. Multiplier-less FIR structure is adopted for hardware implementation to reduce the chip area cost making the technique implementable in digital power meter. A detailed hardware architecture and its implementation in FPGA is presented. Furthermore, the measurement of reactive power for various frequencies between 50 and 250 Hz is also presented.