A New Type of Three-phase Asymmetric-LCL Power filter for Grid-Tied Voltage Source Inverter with Step-up Transformer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Journal / PublicationIEEE Transactions on Industrial Electronics
Online published13 Dec 2021
Publication statusOnline published - 13 Dec 2021


Power filters have been widely adopted to suppress harmonics caused by the pulse width modulation of grid-connected inverters. In order to save the total inductance, the cost and the size of system, different kinds of power filters had been proposed for the three-phase three-wire grid-connected inverter. However, in industrial applications, due to production cost considerations, the difficulties caused by actual parameter deviations must be considered. In this paper, a new three-phase three-wire power filter is proposed, being with a simple structure almost the smallest total inductance, and strong resistance to the adverse effects of parameter shifts. The design of the filter parameters and the grid-connected system controller is introduced in details. A comparable study on the influence of parameter offset between different types of notch power filters is also given. Simulation and experimental results on a 380 V/50 Hz/6 kW three-phase inverter prototype verify the performance of the proposed power filter

Research Area(s)

  • Asymmetric, Capacitors, Harmonic analysis, Inductance, LC trap, LCL filter, Parameter shifts, Power filters, Power harmonic filters, Switches, Switching frequency