A high performance generalized discontinuous PWM algorithm

In this paper a generalized discontinuous pulse width modulation (GDPWM) method with superior high modulation operating range performance characteristics is developed. An algorithm which employs the conventional space vector PWM method in the low modulation range, and the GDPWM method in the high modulation range is established. As a result, the current waveform quality, switching losses, voltage linearity range and the overmodulation region voltage gain of a PWM-VSI drive are optimized online as opposed to conventional modulators with fixed characteristics. Due to its compactness, simplicity and superior performance, the algorithm is suitable for most high performance PWM-VSI drive applications. The paper provides a detailed performance analysis of the method and compares it to the other methods. Experimental results verify the superiority or this algorithm to conventional PWM methods.