Modeling and Experimental Investigation on Vector Control of Grid-connected Inverter-Based Distributed Generation

ABSTRACT

As the distributed generation (DG) systems based on small hydro, wind turbine and solar energy etc., are intermittent power sources, the grid-connected inverter is employed as an interfacing device to maintain voltage at the point of common coupling (PCC) and power quality. If these systems are not well controlled then their connection to the utility network can lead to grid instability or even failure. In order to solve this problem, current controller plays an important role on grid-connected inverter system. In this article vector control of grid connected-inverter system based on grid-flux oriented reference frame is presented. In addition, a modified delta-sigma modulator in the inner feedback loop is proposed to maintain voltage quality at the utility end with sinusoidal current injection. Moreover, the proposed control strategy ensures independent control of active and reactive power flowing into the grid. The overall performance of proposed control strategy is analyzed in MAT-LAB-Simulink environment and the obtained results are validated with experimental results in the laboratory prototype using a TMS320F2812 DSP platform.

Key Words::

• Current Controller
• Delta modulator
• Delta-sigma modulator
• Distributed Generation (DG)
• Total Harmonic Distortion (THD)
• Vector Control
• Voltage Source Inverter (VSI)

Additional information

Notes on contributors

Mohamayee Mohapatra

Mohamayee Mohapatra received the B.E degree from Biju Patnaik University of Technology (BPUT), Rourkela, India, in 2003, and the M.Tech (By Res.,) degree from National Institute of Technology Rourke-la, India, in 2012. She is currently working as a lecturer in IGIT Sarang, Odisha. India. Her interests include power electronics and drives, distributed power generation system, and power quality. E-mail: [email protected]

B. Chitti Babu

B. Chitti Babu (corresponding author) received the B.E degree in Electrical & Electronics Engineering from Madurai Kamaraj University, India and M.E degree in Power Electronics & Drives from Anna University Chennai, India and Ph.D. in Electrical Engineering from National Institute of Technology Rourkela, India in 2003, 2006 and 2012, respectively. He is currently a Postdoctoral Research Fellow with the Centrum ENET, VSB-Technical University of Ostrava, Czech Republic. He is a recipient of Post-Doctoral Research fellowship from STRONGTiES/Euro-pean Union Project, U.K to carry out research work at Wroclaw University of Technology (WUT), Poland from 2013-2014. His research interests include power electronics applications in distributed power generation systems and low-power electronics design, including photovoltaic energy systems. He is a senior member of IEEE, USA. E-mail: [email protected]

K.B. Mohanty

Kanungo Barada Mohanty has received B.E. degree from Sambalpur Univ., M.Tech. and Ph.D. degrees from Indian Institute of Technology, Kharagpur in the years 1989, 1991 and 2002 respectively, in Electrical Engineering. He is a faculty member of Electrical Engg. Dept, National Institute of Technology, Rourkela since 1991, and currently serving as an Associate Professor. He has published 17 journal papers and more than 40 conference papers. His research interests include control and estimation in induction machine specifically vector control, DTC and wind energy conversion systems. Dr. Mohanty is a Senior Member of the IEEE, Fellow of the IE (India), Fellow of IETE, and Life Member of Solar Energy Society of India. E-mail: [email protected]