دانلود رایگان مقاله انگلیسی ساختار بهینه اینورتور چندسطحی سوئیچ کاهش داده شده یک فاز سه گانه ی تعمیم شده - الزویر 2018

abstract

This study presents a new generalized three-phase multilevel converter based on the combinations of half-bridge modules along with a three-phase T-Type multilevel inverter. The proposed topology reduces the number of switches and associated gate-driver circuits that attains much higher number of output voltage levels. The optimized structure of the proposed three-phase inverter topology has been developed to obtain the maximum number of output voltage levels of the inverter with a minimum number of power electronic switches and the DC voltage sources. The operation, control and performance analysis of the proposed generalized multilevel inverter have been considered here. A nearest level control (NLC) technique is adopted to generate the gating signal for the proposed three-phase hybrid inverter. A laboratory prototype of a specimen three-phase low power fifteen-level inverter have been designed using twenty four switches and nine voltage sources. The conduction losses of the proposed fifteen level inverter is around 14.71 watt/phase compared to 23.26 watt/phase in an asymmetrical cascaded inverter. The exhaustive simulations ofthe proposed three-phase inverter are performed usingMATLAB/SIMULINK and the results are verified experimentally and presented for the different modulation index.

7. Conclusion

The paper demonstrated a new generalized three-phase hybrid multilevel inverter configuration with reduced number of switches and the DC sources. The optimal design of the proposed generalized MLI has been developed for any given number of switches and DC voltage sources using the generalized expressions developed. The optimum value of switches and voltage sources required to design the proposed three-phase inverter that generates maximum inverter voltage levels have been studied and plotted for various combinations of the above inverter components. The NLC based modulation technique have been developed for any voltage level and simulated for the threephase fifteen-level inverter using MATLAB/Simulink platform and implemented in real-time using DS1103. Experiments have been conducted on a laboratory prototype of the proposed fifteen-level inverter for the R–L load. The experimental results corresponding to the different modulation index are also presented that verified the respective simulation results. The effectiveness of the proposed reduced switch three-phase MLI configuration have been studied by comparing the LSR, LDR and number of voltage source (NV) of the proposed MLI with the other MLI configuration and it is found better than the existing MLIs presented here.