Theoretical Considerations for Single-Phase Interleaved Converters Operated With SHE-PWM

This letter defines selective harmonic elimination pulse width modulation (SHE-PWM) formulations for single-phase, interleaved converters. Through precalculated solutions, interleaved converters work at the same operating point while eliminating multiple low-order harmonics. It is shown that multiple continuous solutions can be acquired for three-level interleaved waveforms. Extending the method to multiple levels further complicates the problem and reduces both the number and continuity of the solutions. Searching for solutions when the maximum possible number of harmonics, that can be minimized using this PWM method, is reduced confirms that such compromise can provide additional solutions with a minimal effect on the waveform´s harmonic distortion. The SHE-PWM considerations are verified with simulations and experimental results.