An adaptive window function method for power measurement

• Published in: IEEE transactions on instrumentation and measurement Vol. 49; no. 6; pp. 1194 - 1200
• Main Authors: Jian Qiu Zhang, Ovaska, S.J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-12-2000; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Distortion measurement; Finite impulse response filter; Finite wordlength effects; Frequency measurement; Frequency response; Power measurement; Sampling methods; Time domain analysis; Wattmeters
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/19.893255

An adaptive window function for distorted power measurement is introduced in this paper. It can automatically provide the optimal window function according to the measured signal. Thus, the applied window function is always optimal in the sense of the zeros of its frequency response corresponding to the undesired measured signal spectrum components which will result in the harmful truncation errors. As a result, the harmful truncation errors of asynchronous sampling and the influence of interharmonics in the measured signal spectrum can be totally eliminated. The correctness, accuracy, and applicability of the proposed method have been verified both theoretically and by extensive simulations.