Time-varying harmonic analyzer prototype

• Published in: Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010 pp. 1 - 7
• Main Authors: Fabri, Diego F, Martins, Carlos H N, Silva, Leandro R M, Duque, Carlos A, Ribeiro, Paulo F, Cerqueira, Augusto S
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-09-2010
• Subjects: Discrete Fourier transforms; DSP; Frequency modulation; Hardware; Harmonic analysis; harmonic decomposition; Power harmonic filters; Recursive DFT; Time frequency analysis; time-varying harmonics
• ISBN: 142447244X; 9781424472444
• ISSN: 1540-6008; 2164-0610
• DOI: 10.1109/ICHQP.2010.5625319

This paper presents a time-varying harmonic analyzer based on the Sliding Window DFT implemented on a DSP platform. The harmonic decomposition is carried out using the TMS320F28027 digital signal processor, and the samples of the decomposed signal are sent to a PC based computer using serial interface. Several real cases are analyzed, revealing the time-varying behavior of the harmonic component. Different from commercial harmonic analyzer, the prototype presented in this paper uses a different way to visualize the harmonic components, based on time decomposition approach. This new visualization of time-varying harmonics might help engineers and researchers to develop new insights in the transient mechanisms of waveform distortions and possible new applications for power quality monitoring, control and protection.