A Low Harmonic Control Method of Bi-Directional Three- Phase Z- Sources
Mr. G. Srikanth1, Mr. J. Nagaraju2, Ms. K. Anusha 3, Mr. K. Srihari 4
1Department of Electrical and Electronics Engineering, School of Engineering, Anurag University, Hyderabad
2Department of Electrical and Electronics Engineering, School of Engineering, Anurag University, Hyderabad
3Department of Electrical and Electronics Engineering, School of Engineering, Anurag University, Hyderabad
4Department of Electrical and Electronics Engineering, School of Engineering, Anurag University, Hyderabad
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Abstract - Three-phase Z-source inverters offer a voltage boosting solution of single-stage topology. They can also operate bidirectionally as rectifiers, hence have excellent potential for applications in the area of transportation electrification like Vehicle-to-Grid (V2G) chargers. In this paper, three new modulation schemes for three-phase Z-source converters are presented and analyzed. The best performed one is further extended to a closed-loop PI control technique. Although the voltage conversion ratio is adjustable, the output voltage. Total Harmonics Distortion (THD) is less than 3% between the voltage ratio range of 0.5 to 2.5. The effectiveness of the developed method has been completely verified in MATLAB/Simulink simulations and RT- LAB Hardware-In-Loop (HIL) experiments according to the real-time simulator OPAL-RT OP4510. The proposed one is compared with conventional control techniques
operates better with lower harmonics, adjustable voltage gains, and less complex control algorithm. Index Terms—Z-source converter, Bi-directional converter, shoot-through states, voltage harmonics, closed-loop control.
Key Words: Z-source inverter, power electronics, vehicle-to-grid (V2G), renewable energy, three-phase inverter, low harmonic control, power conversion efficiency, bidirectional operation.
