@article{YAN2025, 
author = {Qingzeng YAN and Ye LIU and Baiqiang SUN and Longlong ZHANG and Jinkui HE and Xiaoying SONG},
title = {Minimization of current zero-crossing distortions without filter parameters based on DSOGI-PLL for Vienna rectifiers},
year = {2025},
journal = {Experimental Technology and Management},
volume = {42},
number = {7},
pages = {134-142},
keywords = {Vienna rectifier, zero-crossing distortion, double second-order general integrator phase-locked loop (DSOGI-PLL), without filter parameters},
url = {https://www.sciopen.com/article/10.16791/j.cnki.sjg.2025.07.017},
doi = {10.16791/j.cnki.sjg.2025.07.017},
abstract = {[Objective]The Vienna rectifier, evolved from the T-type three-level inverter, offers a simple structure, few power devices, and no dead zone effect. These advantages not only reduce output voltage distortions and simplify control strategies but also mitigate switching losses of power devices. The Vienna rectifier has become one of the most well-known rectifier topologies and is widely applicable in electric vehicle fast charging stations, renewable energy grid integration, and high-performance power factor correction systems. However, the Vienna rectifier can only operate under the condition where the alternating current (AC) and AC voltage of the rectifier have the same phase; otherwise, serious current zero-crossing distortion problems will occur. Because of sampling delays and the influence of grid-side three-phase filters, there exists a phase difference between the AC voltage and current of the rectifier, leading to significant distortions at three-phase current zero-crossing points. Given that the filter parameters of the Vienna rectifier are nonlinear and affected by several factors, such as current frequencies and temperature, accurate values are difficult to obtain. Consequently, the effectiveness of existing strategies for current zero-crossing minimization with filter parameters will be impaired by inaccurate parameters.[Methods]Therefore, in this study, the factors causing current zero-crossing distortions are analyzed from the perspective of current flow paths and vector graphics with the conventional dual closed-loop control strategy. Based on the analysis, a current zero-crossing distortion minimization strategy without filter parameters for the Vienna rectifier is proposed. A double second-order general integrator phase-locked loop (DSOGI-PLL) is adopted to extract the phases of the grid and rectifier AC voltages, and the phase difference caused by the L or LCL filter is accurately obtained. The reactive current command is first calculated using the integration of DSOGI-PLL and then set as the q-axis current reference. The reactive current compensation is subsequently implemented using a cascaded control structure composed of outer voltage stabilization and inner current tracking loops. With a dual closed-loop control strategy, the Vienna rectifier AC voltages and the grid-connected currents are synchronized, thereby suppressing current zero-crossing distortions.[Results]Simulation models in MATLAB/Simulink are built for Vienna rectifiers with L and LCL filters. In the simulation results, the output current is severely distorted when the conventional dual closed-loop control strategy is employed without the reactive current compensation, and the total harmonic distortions (THDs) of the currents with L filters are 1.52%, 1.53%, and 1.49%. With the proposed current zero-crossing distortion minimization strategy, the distortions of the three-phase currents are significantly reduced, and the harmonic distortions have been significantly attenuated. The corresponding THDs of the three-phase currents are all 1.26%. At the same time, the proposed strategy is also effective with LCL filters. With the conventional dual closed-loop control strategy, the THDs of the three-phase currents with LCL filters are all 1.11%. After the proposed current zero-crossing distortion minimization strategy is employed, the THDs of the three-phase currents with LCL filters are 1.01%, 0.98%, and 0.99%. The current zero-crossing distortions are also effectively suppressed.[Conclusions]The theoretical analysis and simulation results verified that the proposed control strategy for the Vienna rectifier can effectively minimize current zero-crossing distortions without filter parameters.}
}