Abstract
In this study, a three-phase unified power quality conditioner (UPQC) topology based on a quadruple-active-bridge (QAB) is presented as an attractive solution to power quality issues. It is composed of three single-phase series converters, a three-phase shunt converter and a QAB converter located at the common DC-link. Since the bulky low frequency isolation transformers are replaced by the high frequency ones in QAB, it leads to higher power density, reduced weight and volume. The QAB converter could function as an energy router to provide multiple DC-link voltage access ports in the UPQC, which increase the flexibility of the UPQC. Finally, the MATLAB/Simulink simulation results and hardware-in-the-loop testing verify the correctness and effectiveness of the proposed topology and control method.
Highlights
Nowadays, the power quality (PQ) issues, including reactive and harmonic currents, sags/swells in the supply voltage, and distortion, are critical and not new [1], [2]
In [14], [15], the unified power quality conditioner (UPQC) integrated with distributed generator (DG) system (UPQC-DG) is presented to relieve the load active power demand on the grid, The associate editor coordinating the review of this manuscript and approving it for publication was Nagesh Prabhu
Due to the removal of the bulky low frequency isolation transformers and the use of the QAB, the UPQC-QAB has the advantages of higher power density and more flexibility
Summary
The power quality (PQ) issues, including reactive and harmonic currents, sags/swells in the supply voltage, and distortion, are critical and not new [1], [2]. Because the QAB converter functions as an energy router in the UPQC, it cannot only provide more power electronic interfaces for renewable energy sources, and make it possible to mitigate the unbalanced grid currents caused by the unbalanced load. Three DC ports (ports a, b and c) of the QAB are connected with the three single-phase series converters, and the fourth one (port d) is connected with the shunt converter In this topology, the QAB functions as an energy router in the UPQC, and it provides flexible power electronic interfaces for renewable energy sources. Apart from the merits of removing the LF transformer and providing more electronics interfaces, the proposed UPQC-QAB has the advantages of mitigation of voltage sag/swell, compensation of load reactive power, elimination of current harmonics and mitigation of unbalanced grid current simultaneously. Lse and Cse represent the filter inductance and capacitance, and Rse is the equivalent resistance
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