Title :
Improved spectral performance of random PWM schemes with weighted switching decision
Author :
Shrivastava, Yash ; Sathiakumar, S. ; Hui, S. Y Ron
Author_Institution :
Dept. of Electr. Eng., Sydney Univ., NSW, Australia
fDate :
11/1/1998 12:00:00 AM
Abstract :
The authors present a statistical approach to the analysis of random pulsewidth modulation (RPWM) methods which generate PWM signals by comparing a reference modulating function with random numbers or signals. Such an approach is used to analyze and optimize a new weighted RPWM (WRPWM) method and also a standard trapezoidal RPWM method. The WRPWM scheme combines the advantages of the nondeterministic and deterministic PWM methods by adding some deterministic nature into the nondeterministic RPWM method. Both theoretical and experimental results confirm that the optimized WRPWM method has better spectral performance over the standard RPWM schemes and has attractive features such as the potential of third-harmonic boosting, reduced acoustic noise, and minimal low-order harmonics under an overmodulation condition for electronic drive applications
Keywords :
PWM power convertors; power conversion harmonics; statistical analysis; switching; PWM signals generation; deterministic PWM method; electronic drive applications; minimal low-order harmonics; nondeterministic PWM method; overmodulation condition; random PWM schemes; reduced acoustic noise; reference modulating function; spectral performance; statistical approach; third-harmonic boosting; trapezoidal RPWM method; weighted switching decision; Boosting; Optimization methods; Probability distribution; Pulse generation; Pulse width modulation; Pulse width modulation converters; Pulse width modulation inverters; Sampling methods; Signal analysis; Space vector pulse width modulation;
Journal_Title :
Power Electronics, IEEE Transactions on