scholarly journals An Efficient Grid-Connected Three-Phase Single-Stage Boost Current Source Inverter

2019 ◽  
Vol 6 (3) ◽  
pp. 142-151 ◽  
Author(s):  
Akanksha Singh ◽  
Behrooz Mirafzal
Keyword(s):  
Current Source ◽  
Single Stage ◽  
Current Source Inverter ◽  
Three Phase

scholarly journals Enhanced Performance Modified Discontinuous PWM Technique for Three-Phase Z-Source Inverter

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 578 ◽  
Author(s):  
Hossameldin ◽  
Abdelsalam ◽  
Ibrahim ◽  
Williams
Keyword(s):  
Current Source ◽  
Operating Conditions ◽  
Single Stage ◽  
Superior Performance ◽  
Voltage Source ◽  
Passive Component ◽  
Operating Range ◽  
Three Phase ◽  
Voltage Stress ◽  
Conversion Stage

Various industrial applications require a voltage conversion stage from DC to AC. Among them, commercial renewable energy systems (RES) need a voltage buck and/or boost stage for islanded/grid connected operation. Despite the excellent performance offered by conventional two-stage converter systems (dc–dc followed by dc–ac stages), the need for a single-stage conversion stage is attracting more interest for cost and size reduction reasons. Although voltage source inverters (VSIs) are voltage buck-only converters, single stage current source inverters (CSIs) can offer voltage boost features, although at the penalty of using a large DC-link inductor. Boost inverters are a good candidate with the demerit of complicated control strategies. The impedance source (Z-source) inverter is a high-performance competitor as it offers voltage buck/boost in addition to a reduced passive component size. Several pulse width modulation (PWM) techniques have been presented in the literature for three-phase Z-source inverters. Various common drawbacks are annotated, especially the non-linear behavior at low modulation indices and the famous trade-off between the operating range and the converter switches’ voltage stress. In this paper, a modified discontinuous PWM technique is proposed for a three-phase z-source inverter offering: (i) smooth voltage gain variation, (ii) a wide operating range, (iii) reduced voltage stress, and (iv) improved total harmonic distortion (THD). Simulation, in addition to experimental results at various operating conditions, validated the proposed PWM technique’s superior performance compared to the conventional PWM techniques.

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