Abstract
A new modulation strategy has been introduced in this paper in order to enhance the boost factor for the three-level quasi-switched boost T-type inverter (3L-qSBT2I). Under this approach, the component rating of power devices is significantly decreased. Moreover, the use of a larger boost factor produces a smaller shoot-through current. This benefit leads to reducing the conduction loss significantly. Furthermore, the neutral voltage unbalance is also considered. The duty cycle of two active switches of a quasi-switched boost (qSB) network is redetermined based on actual capacitor voltages to recovery balance condition. Noted that the boost factor will not be affected by the proposed capacitor voltage balance strategy. The proposed method is taken into account to be compared with other previous studies. The operation principle and overall control strategy for this configuration are also detailed. The simulation and experiment are implemented with the help of PSIM software and laboratory prototype to demonstrate the accuracy of this strategy.
Highlights
Currently, a conventional three-level T-type inverter (3L-T2I) is applied for low voltage applications due to its advantages of low conduction loss due to not using extra diodes compared to neutral point clamped inverter (NPCI) configuration or producing better output quality compared to two-level inverter [1,2]
This topology is recently adopted for many applications, especially photovoltaic (PV) systems and motor drives, etc. [3,4,5]
Several applications based on ZS inverter (ZSI) were discussed for the motor drive system, micro-grid connection, and PV applications [9,10]
Summary
A conventional three-level T-type inverter (3L-T2I) is applied for low voltage applications due to its advantages of low conduction loss due to not using extra diodes compared to neutral point clamped inverter (NPCI) configuration or producing better output quality compared to two-level inverter [1,2]. Like the ZS network, this type of impedance-source structure was considered to incorporate with the three-level inverter to provide multilevel characteristics [17,18,19,20,21,22] In these approaches, two qZS circuits are connected to guarantee three-level operation at the output. In [27,28,29,30], the qSB network utilized only one inductor and one DC input source, which saves one inductor and a split DC source compared to [25] These works proposed a new pulse-width modulation (PWM) strategy based on the phase shift carrier method to provide some benefits such as high voltage gain [21,27], common-mode voltage elimination [28], the capability of operating in normal and open-circuit faults [29], and small component rating.
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