Abstract
This paper presents a carrier modulation technique to control the three-phase, two-level quasi switched boost inverter. This PWM algorithm uses three carrier waves, the first of which is for the inverter while the others are for the booster. The boost factor depends on the short circuit interval on the DC/DC booster and the inverter. When the short circuit interval on the DC boost is twice that on the inverter, the modulation index can be enlarged. The new algorithm is analyzed, calculated, simulated, and tested. The analysis and calculation results show that the proposed technique can reduce the voltage on the DC link capacitor compared to a conventional approach. It can reach 22.16% when the ratio of the DC source voltage to the effective reference voltage is 0.5. The modulation index can extend to 29% under these conditions and the current ripple in the boost inductor can be reduced by 4.8%. The simulation and experimental results also show similarities, thereby confirming the analysis and calculation.
Highlights
Single-stage direct boost inverters are widely used in electrical systems such as wind power, solar cells (PV), UPS, and electric vehicles [1,2,3,4]
Because the quasi switched boost inverter (QSBI) adds a controllable switch for DC/DC boost, the stageuses direct boost inverters: source inverter (ZSI) of andgives the more quasi
Because the QSBI adds a controllable switch for DC/DC boost, the current ripple turning additional switch at a different of the shoot-through
Summary
Single-stage direct boost inverters are widely used in electrical systems such as wind power, solar cells (PV), UPS, and electric vehicles [1,2,3,4]. As a result of using a low modulation index at a high boost factor for the buck inductor current ripple by turning on the additional switch at a different time of the shootmode operation, the QSBI has a lower efficiency and a higher current distortion. As a result of using a low modulation index at a high boost factor for main parts: an analysis of QSBI in Section 2; the QSBI control technique will be analyzed the buck mode operation, the QSBI has a lower efficiency and a higher current distortion. The disadvantage of QSBIs are the low modulation index (m), the high voltage on the DC link in Section 3; Section 4 presents the simulation and experimental results; and Part 5 will link capacitor, and the high input current ripple [15].
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