Harmonic Current Suppression in Three-Phase Grids Under an Unbalanced Installation of Single-Phase Distributed Generation Units

Abstract

As a result of the progress in renewable energy technologies, distributed generation (DG) with harmonic compensation capability has become an attractive topic. If photovoltaic (PV) systems have harmonic compensation functionality, they can help suppress the harmonic currents produced by multiple harmonic sources like energy-saving household appliances. This paper proposes harmonic circulate control, which is a harmonic suppression method that uses DG units. Using the proposed method, the current distortion in three-phase distribution grids can be suppressed by a smaller number of harmonic compensators than with conventional methods. In order to verify the validity of the proposed control strategy, experimental results using a laboratory system are presented.