Maximum boost control for interleaved single-phase Quasi-Z-Source inverter

Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

“…According to the study, a full-SiC 2-level qZSI solution has a clear advantage over the 3-level NPC qZSI solution with Si MOSFETs, in terms of higher efficiency, along with the lower volume of the heatsink, while the volume of passive elements remains the same. The interleaved 2-level qZSI for a single-phase PV application and the control approaches, including different modulation techniques, are discussed in detail in [23][24][25][26][27]. Our work is devoted to the feasibility study of the interleaving approach in terms of size, efficiency and the overall cost of the converter.…”

“…Splitting power flow between the two channels with the same resistance may reduce conduction losses up to two times. As a result, interleaving is an approach that enables converter design with extremely high efficiency and power density by means of N channel utilization [34,35]. Evidently, however, this leads to an increase in cost.…”

Experimental Comparison of Two-Level Full-SiC and Three-Level Si–SiC Quasi-Z-Source Inverters for PV Applications

“…The main parts of the topology include the QZS network represented by L 1 , D 1 , C 1 , L 2 , and C 2 ; the FB 2L inverter based on MOSFET switches S 1 , S 2 , S 3 , and S 4 ; and the output filter L F1 , C F , and L F2 feeding the load or connected to the grid. Detailed discussions and explanations on the 2L QZSI for a single-phase PV application as well as the control approaches, including SBC, MBC, constant boost control and their modifications, are provided in [31,[33][34][35]. In this study, SBC was used for generating the ST states.…”

“…To improve the reliability of the system and achieve higher power density by the reduction of redundant passive components, the approach of interleaving is often used in VSI. It enables significant reduction of the current ripple in QZS-stage inductors and the voltage ripple at the DC-link [27,31,[33][34][35]. A topology of the Interleaved QZSI (IQZSI) under the Simple Boost Control (SBC) was proposed in Reference [34] for PV applications.…”

“…It smoothes out variation in the Shoot-Through (ST) duty cycle. The operation of MBC in IQZSI revealed the importance and proved the necessity of power decoupling in such PV systems [35]. Additionally, some control approaches for 3l NPC QZSI are proposed in [37][38][39].…”