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Keywords

Z source inverter, single cycle control, active damping method, straight through signal, LCL filtering

Abstract

The Z-source inverter has been widely used because it overcomes the shortcomings of the conventional voltage-type inverter that can only be stepped down and cannot be boosted, and must be added to the dead time. This paper proposes a single-cycle and LCL active damping control scheme to control the grid connection of three-phase Z-source inverter. Compared with the traditional PWM control, the singlecycle control has the advantages of simple structure, low-harmonic content and high output power quality while the LCL filter performs better than the LC and L filters, but the resonance peak reduces system stability. Therefore, the active damping method is adopted and the filter capacitor current loop and the grid-connected current loop are introduced to form a double loop control structure to suppress the adverse effect of the resonance peak on the system stability. Finally, simulations under Simulink verify the feasibility and effectiveness of the proposed scheme.

DOI

10.19781/j.issn.1673-9140.2021.02.019

First Page

155

Last Page

161

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