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Topological and Modulation Design of Three-Level Z-Source Inverters

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I E E E
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  • Ecology

Abstract

I Asymmetrical Grid Fault Ride-Through Strategy of Three-phase Grid-connected Inverter Considering Network Impedance Impact in Low Voltage Grid Xiaoqiang Guo, Member, IEEE, Xue Zhang, Baocheng Wang, Weiyang Wu, and Josep M. Guerrero, Senior Member, IEEE Abstract—This paper presents a new control strategy of three-phase grid-connected inverter for the positive sequence voltage recovery and negative sequence voltage reduction under asymmetrical grid faults. Unlike the conventional control strategy based on an assumption that the network impedance is mainly inductive, the proposed control strategy is more flexible and effective by considering the network impedance impact, which is of great importance for the high penetration of grid-connected renewable energy systems into low-voltage grids. The experimental tests are carried out to validate the effectiveness of the proposed solution for the flexible voltage support in a low voltage grid, where the network impedance is mainly resistive. Index Terms—Fault ride-through, grid faults, grid-connected inverter, flexible voltage support X. Guo is with the Key Lab of Power Electronics for Energy Conservation and Motor drive of Hebei province, Department of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China (e-mail: [email protected]) J. M. Guerrero is with the Department of Energy Technology, Aalborg University, Aalborg DK-9220, Denmark (e-mail: [email protected]). joz Typewritten Text This document is the preprint version of the final paper: nullX. Guo, X. Zhang, B. Wang, W. Wu, and J. M. Guerrero, "Grid Asymmetrical Fault Ride Strategy of Three-phase Grid-connected Inverter Considering Network Impedance in Low Voltage Grid," IEEE Trans. Power Electron., 2013.null joz Typewritten Text joz Typewritten Text joz Typewritten Text joz Typewritten Text I. INTRODUCTION With the high penetration of grid-connected renewable energy systems, the new grid

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