volume | PIER Journals

Abstract

A direct-through three-level inverter topology based on center-tap inductance and its complex vector control strategy are proposed. This topology structurally avoids the direct short-circuit problem of the DC side capacitor, eliminates the need to set a dead zone in the drive signal, and eliminates the low-order harmonics introduced by the dead zone. For this direct-through inverter, the corresponding complex vector control strategy is studied. By establishing a full-frequency domain model of the system, the fundamental cause of the coupling of DQ-axis currents in the synchronous rotating coordinate system was analyzed. To address the issue of poor dynamic response caused by coupling, a complex coefficient controller was designed. By introducing imaginary parts into the controller parameters, the additional poles introduced by coordinate transformation were offset, achieving decoupling control of active and reactive currents.Simulation and experimental results show that, compared with the traditional real-coefficient PI controller, the proposed complex vector control strategy can effectively reduce the coupling degree of DQ-axis current, improve the dynamic performance of the system, and verify the correctness and effectiveness of the proposed topology and control method. This inverter topology features both high reliability and excellent output performance without increasing the number of power switch devices.

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Dr. Yao He

Dr. Xiangyi Sun

Dr. Xinxin Zheng

Dr. Xintian Liu

Dr. Yanan Zhou

Dr. Lin He