New combined impedance‐source network inverter with high gain performance in low shoot‐through and improved quality factors

Abstract

Summary In this paper, a new combined impedance‐source network inverter (CISI) with high voltage gain in low duty cycle is presented. With common ground between the input source and the inverter bridge and a continuous input current, the proposed converter is a suitable choice for renewable energy applications. The duty cycle of the inverter switches is low, leading to a reduction in losses and improving the efficiency. Also, due to the small duty cycle, the modulation index can be increased, and as a result, the quality of output voltages and currents is greatly improved. The proposed circuit has no switch in the input impedance network, and the number of components is reasonable compared to other works. Another advantage of the proposed converter is the low voltage stress on its capacitors and diodes. The proposed circuit is designed and tested at 180 W. The experimental results and the calculated values are close to each other, verifying the accuracy of the analysis.

Multi‐port single‐phase inverter considering battery‐alone mode for stand‐alone applications

“…Figure 17A illustrates CSF curves of the diodes for the proposed converter compared to previous studies. 17,[22][23][24] The results prove the excellence of both the proposed converter and the converter in Yousefi Moghadam et al 24 for 0 ≤ d ST ≤ 0.12. According to the experimental results, the working range of the d ST for the proposed converter is under 0.1.…”

“…Using the power loss analysis, the efficiency curve of the proposed converter is obtained and compared with other works in Figure 19. According to the results, the efficiency of the proposed converter has higher values compared to the almost all converters except for Yousefi Moghadam et al 24 In addition, for the powers above 100 W (P ≥ 100 W), the proposed converter transfers power with the efficiency greater than 90%. It must be noted that the efficiency of the converter can be further improved using more qualified components, especially semiconductors and output filter.…”

“…The voltage stress of the capacitors is obtained by analyzing the circuit in Figure 2 for the single input mode. Figure 12 is drawn based on the equations and analysis in previous studies 17,[22][23][24] that present single port DC-AC inverters. By referring to the converters configurations, we understand that they include capacitors with three levels of voltage stress depending on the location of the capacitors in the circuit.…”

“…have the lowest stress in this level. The capacitors C 2 in Yousefi Moghadam et al 24 and C 2 and C 3 in Zhu et al 22 suffer from higher voltage stress.…”

“…According to the results, the capacitor C 2 in the proposed converter and C 4 in Abbasi et al 17 have the lowest stress in this level. The capacitors C 2 in Yousefi Moghadam et al 24 and C 2 and C 3 in Zhu et al 22 suffer from higher voltage stress.…”