Document Type : Research article

Authors

Department of Electrical Engineering, Faculty of Engineering, Malayer University, Malayer, Iran.

Abstract

Nowadays, the use of renewable energy sources has gained more attention due to their lower pollution and cost compared to traditional fossil fuel generators. Microgrid (MG) structures are used for better management of these resources. This article focuses on power control in three-terminal AC/DC hybrid MGs. For this purpose, a network backup converter is used to improve power sharing and reduce power quality disturbances. The components of the MG include distributed generation units, AC loads, DC loads, energy storage system (battery), and parallel connecting converters. In the studied topology of AC/DC hybrid MG in this article, there are two main converters: a grid-forming converter that acts as an intermediary converter and is used to control the MG voltage, and a VSC converter that is located between the DC link (including the DC MG and battery) and the AC MG. In this article, a control system is implemented for a hybrid MG and simulations are performed in MATLAB software for four different scenarios related to active and reactive power of the MG and loads. Simulation results show that the energy management system and power control in the AC/DC hybrid MG have reduced harmonics and improved system reliability in the MG.

Graphical Abstract

Control and Improvement of Power Quality in Hybrid Three-Terminal AC/DC Microgrids

Highlights

 

  • Presenting a synchronized power control technique for power sharing between power electronic converters
  • Presenting a distributed cooperative control method for voltage and frequency control in AC MGs
  • Providing voltage and current control in a DC MG for hybrid AC/DC MGs
  • Performing both power control and power quality improvement of the AC/DC MG system

 

Keywords