Abstract
This paper presents a modified sinusoidal pulse width modulation (SPWM) switching method for one-phase and investigated two-phase impedance-source inverter structures. The proposed structure generates pulses for a quasi- Z-source converter and this block produces a unilateral voltage sine wave in the block's output. This signal is applied to the inverter as its input wave. For this purpose, the novel SPWM method is proposed for power switches while being switched complementarily. Two power switches are used in the structure to generate the pure sinusoidal output voltage and to minimize total harmonic distortion (THD), which is an essential parameter in inverter design. The results show that the proposed method generates the pure sinusoidal voltage and current signals for resistive and inductive loads and pure voltage and improved current waves for capacitive loads in comparison with existing techniques, since the THD of the output voltage and current signals is strongly affected by the dynamic loads. This method leads to final cost improvement and reduction of the size of the system with fewer number of components, which are essential parameters for renewable energy resource applications. A mathematical model is validated with the 2017a version of MATLAB/Simulink and 1.51% and 1.33% THD values are reported for low and high power loads, respectively, in the one-phase structure and 0.95% and 0.87% in the two-phase system. Finally, a 120 W prototype has been implemented and tested. A sine-wave with 620 Vac peak to peak amplitude and 50 Hz frequency has been gained in the inverter?s output and the quality of the voltage and current waveforms has been evaluated for different two 1.8 k$\Omega$ and 600 $\Omega$ resistive loads in the one-phase structure. Experimental results confirm all mathematical and simulation results.
Highlights
Considering the reduction in the amount of fossil fuel reserves and their damage to nature, renewable energy sources (RESs) as alternative energy resources are emerging to ensure sustainable energy production
This study presents a novel sinusoidal pulse width modulation (SPWM) switching method for Z-source converters connected to H bridge inverters
In this study, a modified SPWM technique is introduced for a Z-source-based inverter structure in order to get pure sinusoidal voltage and current waveforms for inductive and capacitive loads that can solve the nonlinear voltage gain problem with minimum total harmonic distortion (THD)
Summary
Considering the reduction in the amount of fossil fuel reserves and their damage to nature, renewable energy sources (RESs) as alternative energy resources are emerging to ensure sustainable energy production. Schmidt et al [16] presented a highly efficient and reliable inverter concept (HERIC) structure containing from a full-bridge inverter and an AC bypass or FB-ACBP In this topology a minimized and acceptable leakage current can be obtained, the common mode oscillation for the voltage can be addressed by considering the not-clamped potential for the freewheeling path. Z-source converters [26] are presented for RES-based applications because of their performance, efficiency, and low cost This inverter does not need doubly grounded problems features and calculations, and it has suitable power quality without applying any type of THD limiter structures. One of the other benefits of the semi-Z-source inverter structure is that to produce a sinusoidal voltage signal through a load we need to apply only two power switches and this can directly decrease the complexity and total cost of the proposed structure. A laboratory-scaled prototype has been investigated for the one-phase system and confirms all mathematical and simulation results
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