High Gain PWM Method and Active Switched Boost Z-source Inverter With Less Voltage Stress on the Devices

Abstract

This article presents a new circuit topology for high voltage gain active switched boost quasi Z-source inverter (qZSI) and a pulsewidth modulation (PWM) technique. The higher boosting capability with a lower number of elements, the continuous source current, the less voltage stress across the devices, and having the common ground are the main advantages of the proposed structure. The voltage gain of the proposed inverter is twice that of the conventional capacitor-assisted qZSI (sCA-qZSI). Other benefits of the proposed inverter over the sCA-qZSI are the reduction of Z-source passive components and shoot-through current. Compared to the conventional active switched inductor boost qZSI, the proposed inverter has higher output voltage and also lower shoot-through current, while it has fewer components (one fewer inductor, two fewer diodes, but one more capacitor). The boost factor of the proposed inverter is more than twice that of the classic ones. Besides, a high gain PWM technique is proposed, which can be applied to any types of Z-source inverters. Both the simulation and experimental results of the proposed inverter under the proposed PWM technique are examined to validate their operation.

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

“…This technique can reduce the number of passive components, while, because of an extra switch, a driver circuit must be designed and implemented. [7][8][9] Furthermore, these kinds of inverters operate with two different stages, which require two synchronized control loops. To achieve high voltage gain in low duty cycles, small circuit size and high power in ZSI, the switched-inductor (SI) structures were introduced.…”

“…A common technique in designing ZSI and qZSI is the use of active switches in the impedance network section. This technique can reduce the number of passive components, while, because of an extra switch, a driver circuit must be designed and implemented 7–9 . Furthermore, these kinds of inverters operate with two different stages, which require two synchronized control loops.…”

“…More researchers tried to solve these problems by combining SI with ZSI and qZSI structures 10,11 . The structure introduced in Abbasi et al 8 integrates the conventional ZSI converter with a SI network and reduces the number of components; nonetheless, the problem of input current discontinuity exists. The proposed structure in Karbalaei and Mardaneh 11 is a combination of qZSI and SI, which solves the problem of input current discontinuity, whereas the number of passive elements is increased.…”

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

“…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.…”

“…The essential reasons of utilizing quasi-Z-source inverter for MPIs are their advantages such as flexibility in combination with boosting techniques and continuous input current. 16,17 The study in Ge et al 18 presents a qzs-MPI including a battery in parallel with middle capacitor of quasi-Z-source converter, where the configuration does not contain a bidirectional port to control charging/discharging modes of the battery. A gridtied qzs-MPI with low voltage gain is proposed in Rasin et al, 19 which has one bidirectional port for battery and a unidirectional port to transfer power of PV.…”