Voltage-Oriented Control-Based Three-Phase, Three-Leg Bidirectional AC–DC Converter with Improved Power Quality for Microgrids

Moshammed Nishat Tasnim, Tofael Ahmed (), Monjila Afrin Dorothi, Shameem Ahmad, G. M. Shafiullah (), S. M. Ferdous and Saad Mekhilef
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Moshammed Nishat Tasnim: Advanced Power System Laboratory, Department of Electrical & Electronic Engineering, Chittagong University of Engineering and Technology (CUET), Chittagong 4349, Bangladesh
Tofael Ahmed: Advanced Power System Laboratory, Department of Electrical & Electronic Engineering, Chittagong University of Engineering and Technology (CUET), Chittagong 4349, Bangladesh
Monjila Afrin Dorothi: Advanced Power System Laboratory, Department of Electrical & Electronic Engineering, Chittagong University of Engineering and Technology (CUET), Chittagong 4349, Bangladesh
Shameem Ahmad: Department of Electrical & Electronics Engineering, Faculty of Engineering, American International University-Bangladesh (AIUB), Dhaka 1229, Bangladesh
G. M. Shafiullah: School of Engineering and Energy, Murdoch University, Perth, WA 6150, Australia
S. M. Ferdous: School of Engineering and Energy, Murdoch University, Perth, WA 6150, Australia
Saad Mekhilef: School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Melbourne, VIC 3122, Australia

Energies, 2023, vol. 16, issue 17, 1-32

Abstract: Renewable energy sources (RESs) and energy storage schemes (ESSs) integrated into a microgrid (MG) system have been widely used in power generation and distribution to provide a constant supply of electricity. The power electronics converters, particularly the bidirectional power converters (BPCs), are promising interfaces for MG infrastructure because they control the power management of the whole MG system. The controller of BPCs can be designed using several different control strategies. However, all the existing controllers have system stability, dynamics, and power quality issues. Therefore, this study demonstrates the development of an LCL-filtered grid-connected bidirectional AC–DC converter’s (BADC) control strategy based on voltage-oriented control (VOC) to overcome these issues. The proposed VOC-based inner current control loop (ICCL) is implemented in synchronous dq -coordinate with the help of proportional-integral (PI) controllers. An observer-based active damping (AD) is also developed in order to estimate the filter capacitor current from the capacitor voltage instead of directly measuring it. This developed AD system helps to damp the resonance effect of the LCL filter, improves system stability, and also eliminates the practical challenges of measuring capacitor current. The proposed controller with AD is able to realize bidirectional power transfer (BPT) with reduced power losses due to the elimination of passive damping and improved power quality, system dynamics, and stability. The mathematical modeling of the suggested system was developed, and the structure of the system model was established in the MATLAB/Simulink environment. The performance of the proposed system was validated with real-time software-in-the-loop (RT-SIL) simulation using the OPAL-RT simulator for a 16 kVA converter system. The real-time (RT) simulation results show that the BADC with the proposed control scheme can provide better dynamic performance and operate with tolerable total harmonic distortion (THD) of 2.62% and 2.71% for inverter and rectifier modes of operation, respectively.

Keywords: bidirectional converter; control strategy; microgrid; power quality; VOC (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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