Control of DSTATCOM with Parallel Tangent Method Based Adaptive Control Algorithm under Distorted Grid Conditions

Abstract

This paper presents a new adaptive control algorithm for a cascaded multilevel inverter (CHB-MLI) used as a Distribution Static compensator (DSTATCOM) unit to mitigate various power quality (PQ) issues. A Parallel Tangent (PARTAN) Least Mean Square (LMS) adaptive control algorithm controls the compensator. The shunt CHB-MLI exports reactive power needed by the nonlinear load and improves the power factor to unity on the supply side. The system’s closed-loop performance is also studied under a distorted grid employing an additional Second-order generalized integrator (SOGI) block. Modeling of a five-level inverter along with the proposed PARTAN-LMS controller has been done in Matlab/Simulink. Experimental verification of the same system is tested in the laboratory. Simulation and experimental results demonstrate satisfactory performance of the proposed system under dynamic load variation and distorted grid conditions. Further, the performance of the proposed algorithm is compared with conventional and new adaptive algorithms to ascertain its advantages and effectiveness. The THD obtained in supply current and voltages are within stipulated IEEE-519 limits.

Keywords:

• active filter
• adaptive control
• multilevel inverter
• nonlinear loads
• power quality

DISCLOSURE STATEMENT

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

DATA AVAILABILITY

The data that support the findings of this study are available on request from the corresponding author

Additional information

Notes on contributors

Praveen Bansal

Praveen Bansal has done B.Tech in Electrical Engineering from Madhav Institute of Technology and Science, Gwalior in 2009  then complete M.Tech from Maulana Azad National Institute of Technology (MANIT), Bhopal in 2012 in the stream of Electrical Drives and completed PhD from Delhi Technological University, Delhi in year 2023. He is currently working as a Assistant Professor in the department of Electrical engineering at MITS, Gwalior. His research area includes Multilevel inverters, Power Quality improvement techniques, Solar PV array for grid integration, etc.

Alka Singh

Alka Singh graduated with a BE (electrical) from the Delhi College of Engineering in 1996, an MTech in power systems from the IIT Delhi in 2001 and a PhD from NSIT (Delhi University) in 2006. She is professor in the Department of Electrical Engineering, at Delhi Technological University, Delhi, India. Her research interests include FACTS, power systems and power quality. She is a life member of the Indian Society for Technical Edcation.