Digital frequency relaying based on the modified least mean square method

作者：Barbosa Daniel^*; Monaro Renato M; Coury Denis V; Oleskovicz Mario

来源：International Journal of Electrical Power & Energy Systems, 2010, 32(3): 236-242.

DOI：10.1016/j.ijepes.2009.07.009

• Frequency estimation
• Adaptive filter
• Digital protection
• Power system
• Least mean square

This research presents a method for frequency estimation in power systems using an adaptive filter based on the Least Mean Square Algorithm (LMS). In order to analyze a power system, three-phase voltages were converted into a complex signal applying the alpha beta-transform and the results were used in an adaptive filtering algorithm. Although the use of the complex LMS algorithm is described in the literature, this paper deals with some practical aspects of the algorithm implementation. In order to reduce computing time, a coefficient generator was implemented. For the algorithm validation, a computing simulation of a power system was carried Out using the ATP software. Many different situations were Simulated for the performance analysis of the proposed methodology. The results were compared to a commercial relay for validation, showing the advantages of the new method.

• 出版日期2010-3