Abstract
This paper aims to develop a new switched inductor assisted strong boost Z-source inverter (SL-SBZSI) topology with high voltage gain and analyze the steady-state characteristics of the proposed topology. In the proposed topology, two switched inductors are used within the series impedance structure of the Z-source inverter (ZSI) in order to achieve the high voltage gain. The steady-state characteristics of the proposed topology are analyzed to disseminate its several advantages as compared to traditional ZSIs. The key advantages include the higher boost factor with lower shoot-through duty ratio and lower voltage stresses on capacitors as well as on switches of the inverter bridge. Furthermore, the proposed topology has the soft-start ability which significantly reduces the inrush start-up current while comparing with the traditional ZSI. In the proposed topology, a common ground is shared between the output AC voltage and the input DC voltage source which categorizes this topology to the doubly grounded inverter. The characteristics of the proposed SL-SBZSI are analyzed by considering two operating condition where the simple boost pulse width modulation (PWM) scheme is used to extract the shoot-through pulses. The characteristics of the proposed topology are also compared with different existing topologies along with the conventional modified capacitor assisted Z-source inverter (MCA-ZSI), whose boost factor is much closer to the proposed topology. Rigorous mathematical analyses are presented to clearly demonstrate the benefits of the proposed topology while simulation studies are carried out to demonstrate its distinct features as compared to the existing topology. Finally, experimental studies are conducted to further validate the theoretical and simulation results.
Highlights
Modern power networks are dominated by power electronic converters as these converters convert power from one to another, e.g., DC to AC or vice-versa
The performance of the designed SL-SBZSI topology as shown in Figure 1 is verified through simulation results in Matlab/Simulink and compared with the existing MCA-Z-source inverter (ZSI) topology
pulse width modulation (PWM) scheme is adopted as a shoot-through control technique for both topologies
Summary
Modern power networks are dominated by power electronic converters as these converters convert power from one to another, e.g., DC to AC or vice-versa. The lower modulation index is considered as another limitation of the existing ZSI as this affects voltage gain and produces distorted output voltage waveforms [13] These problems are avoided in several works of literature where new topologies such as an improved ZSI [12], embedded ZSI [14], qZSI [15], and series ZSI [16] are developed by introducing distinct impedance configurations. The high boost factor is achieved by composing additional capacitors, inductors, and diodes to the impedance network of ZSIs while using a low shoot-through duty ratio This low shoot-through duty ratio increases the modulation index which improves the quality of output voltage waveforms.
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