Modified cosine filters

Details Modified cosine filters Modified cosine filters

1998-04-15

2000-11-28

Sheikh, Ayaz R.

Data processing: generic control systems or specific application

Specific application, apparatus or process

Electrical power generation or distribution system

700292, 700293, 700297, 700298, 702 60, 702 75, 702 76, 361 76, 361 80, 361 86, 361 87, 361 88, H02J 114, H02J 302, H02J 1700, H02H 700, H02H 900

Patent

active

061546879

ABSTRACT:
A high sample rate cosine filter eliminates DC components by summing them such that they sum to zero. A non-orthogonal cosine filter is also provided. When the cosine filter is applied for N=4 samples per cycle, the samples are separated by 90 degrees. However, at higher sampling rates, it is not necessary to wait for 90 degrees to estimate the phasor value. Non-orthogonal components are used to estimate the phasor value. The time delay associated with the cosine filter is reduced in the process.

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Zegarra, "Microprocessor-Based Time-Overcurrent Relay: Development, Simulation, Design and Testing", A Thesis Presented to the Faculty of the Graduate College of Ohio University, Jun., 1979, 1-145.

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