부산대학교 도서관

A recursive method that eliminates $n+1$ harmonics and their respective multiples from the output voltage of a cascaded H-bridge (CHB) multilevel inverters with $s=2^{n}$ dc sources $(n=1,2,3,\ldots)$ is proposed. It solves $2 \times 2$ linear systems with no singular matrices and always gives an exact solution with very low computational effort. Simulated results in three-phase five-, nine-, 17-, and 33-level CHB inverters, and experimental results in a five-level inverter demonstrate the validity of the method.