Design procedure of single phase PWM DC-AC inverter by divided optimization algorithm

We consider a design method of single-phase PWM DC-AC inverter by using a divided optimization algorithm which is proposed by us. The divided optimization algorithm is one of meta-heuristic algorithms for optimization problems. The divided optimization algorithm searches the optimal value of each particle in parallel. By using the divided optimization algorithms, the switching-phase of the single-phase PWM DC-AC inverter is determined. The updating rule of the particles of the system can be classified into asynchronous updating and synchronous updating. The synchronized updating is that all particles are updated simultaneously. On the other hand, the asynchronous updating is that each particle is updated independently. In this paper, we compare the performance of the synchronous updating with the asynchronous updating by numerical simulations. The design of the switching-phase is an important role to improve the efficiency of the single-phase PWM DC-AC inverter. In order to design the switching-phase by using the divided optimization algorithm, we evaluate the effective value of the output and the total harmonic distortion (abbr. THD). The THD serves as an index to evaluate all harmonics. Since the output of the inverter passes through a low-pass filter, the actual output wave contains only the restricted frequencies. Therefore, we apply a modified THD to evaluate the output. The modified THD treats only limited frequencies.