Title :
Harmonic minimization in delta modulated inverters using tuned filters
Author :
Rahman, M.A. ; Quaicoe, J.E. ; Choudhury, M.A.
Author_Institution :
Fac. of Eng. & Appl. Sci., Memorial Univ. of Newfoundland, St. John´´s, Nfld., Canada
Abstract :
The integrator in the modulator of delta PWM inverters acts as a filter to estimate the input reference signal from the output waveform for comparison purposes. The use of a tuned filter allows the online variation of filter cutoff frequency and ensures minimization of desired harmonics from the output of the inverter. This method is particularly suitable for delta-modulated inverters used in variable-frequency applications. The modulator´s harmonic performance has been studied using a windowed discrete Fourier transform. The theoretical results were verified experimentally. The significance of the modulator lies in its simplicity, versatility, and ease of online harmonic minimization, which is achieved without predetermination of the switching points.<>
Keywords :
delta modulation; filters; harmonics; invertors; pulse width modulation; delta PWM inverters; delta modulation; discrete Fourier transform; filter cutoff frequency; harmonic minimization; harmonic performance; integrator; modulator; tuned filters; variable-frequency applications; Application software; Cutoff frequency; Delta modulation; Discrete Fourier transforms; Filtering; Frequency modulation; Low pass filters; Power harmonic filters; Pulse inverters; Pulse width modulation inverters;
Conference_Titel :
Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE
Conference_Location :
Kyoto, Japan
DOI :
10.1109/PESC.1988.18168
