An enhanced control system for single-phase inverters interfaced with weak and distorted grids

Sushil Silwal, Seyedfoad Taghizadeh, Masoud Karimi-Ghartemani, M. Jahangir Hossain, Masoud Davari

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

This paper presents an enhanced current controller for improving the performance of a class of single-phase gridconnected inverters operating in weak and distorted grid conditions. An inverter designed to operate at normal (strong or stiff and clean) grid conditions may not perform satisfactorily during weak and distorted grid conditions. One major reason is the interfering dynamics of the synchronization or phase-locked loop (PLL). This paper proposes an enhanced control structure for a popular class of single-phase inverters to address this problem. The proposed idea is to include the PLL state variables into the main inverter controller thereby minimizing the undesirable interactions of the PLL with the other components. A method for optimally designing the controller gains is also proposed. Compared to the conventional one, the proposed controller is shown to have a more robust performance over a substantially wider range of weak and distorted grid conditions. Extensive simulation and experimental results are presented to validate the proposed controls.
Original languageEnglish
Pages (from-to)12538-12551
Number of pages14
JournalIEEE Transactions on Power Electronics
Volume34
Issue number12
Early online date8 Apr 2019
DOIs
Publication statusPublished - Dec 2019

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