Virtual Inertia Based SVPN Sequence Control Scheme for Voltage Unbalance Mitigation in Coordination with DSM on a Stand Alone Microgrid

Abstract

There is a growing proliferation of renewable sources of energy and single-phase loads, which are unevenly distributed across distribution networks. This imbalanced distribution intensifies unfavorable conditions within the network, leading to detrimental impacts on power quality, stability, and reliability. The objective of this paper is to demonstrate the collaborative functioning of a space vector-based positive and negative (SVPN) sequence controller and demand-side management to maintain voltage unbalance factor in the accepted threshold of 2%, as specified by the IEC standard 61000-3-13 in a typical IEEE 33 bus network. The presented approach for managing thermostatically controlled devices also proves to be highly effective in ensuring the thermal comfort of end users. Also, the absence of rotational masses in converter-interfaced microgrids leads to a reduction in system inertia. Any disturbance in the system leads to significant issues, such as an increase in the rate of change of frequency (RoCoF) and poor frequency response. Therefore, virtual synchronous generator is integrated with the SVPN controller to improve the frequency response of the system. The coordinated control scheme of the islanded microgrid has undergone assessment using the MATLAB/Simulink platform. Small signal modeling technique has been applied to the converters based on VSG control, incorporating positive and negative sequence controllers to address the escalating dynamic challenges in power electronics-based microgrids. This enhanced stability analysis facilitates handling the ever-increasing dynamic issues encountered in such microgrids.

Keywords:

• Voltage unbalance factor
• sequence control
• thermostatically controlled devices
• virtual synchronous generator
• small signal stability

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Nada Ali

Nada Ali received the B. Tech. degree in Electrical and Electronics Engineering from Integral University, Lucknow, India, in 2011, and the M. E. degree in Electrical Engineering from Birla Institute of Technology (BIT), Ranchi, India, in 2015. She is currently a Research Scholar with the Department of Electrical and Electronics Engineering, Birla Institute of Technology (BIT), Ranchi, India. Her current research interests include microgrid planning, inverter control strategies, renewable energy integration, power quality improvement and demand side management.

Deepak Kumar

Deepak Kumar received the B.Eng. in Electrical and Electronics Engineering (EEE) and M.Eng. in Electrical Engineering (EE) from Birla Institute of Technology (BIT), Ranchi, India, in 2007 and 2011, respectively. He received his Ph.D. (Power Systems) from the School of Electrical Sciences (SES), Indian Institute of Technology (IIT), Bhubaneswar, Odisha, India in 2016. Currently, he is an Assistant Professor in the Department of Electrical and Electronics Engineering, Birla Institute of Technology (BIT), Ranchi, India, working since June 2015. In 2018, he visited Department of Electrical Engineering and Automation, Aalto University, Finland as a Postdoctoral Research Fellow. Dr. Deepak was the recipient of the prestigious national level POSOCO Power System Award under Doctoral category in recognition for his research contribution in power system field in 2016. His major research interests include microgrid control with distributed generation, distributed energy storage systems, demand side management, distribution system design and planning, blockchain application in microgrid, and applications of intelligent computational techniques to power systems.