Model Predictive Control for Three-Level Cascaded H-bridge D-STATCOM

ABSTRACT

In this paper, a model predictive control (MPC) is investigated for a three-level H-bridge D-STATCOM. To predict the future behavior, a discrete-time model of the D-STATCOM is used. Here in the MPC, a single objective cost function is used to avoid the weighted factors in a multivariable objective function, which in turn leads to complex optimization problem. A single objective cost function controls the error in the reference and actual current. A separate proportional integral controller and a capacitor balancing algorithm are used to self-support the DC capacitor voltage under load variation. The reference current for D-STATCOM is generated by using d-q control strategy for the compensation of reactive power and current harmonics. The switching state which minimizes the current error and the corresponding redundant switching state which meets for the DC capacitor voltage balancing are applied at the next sampling instant. The performance of the investigated MPC control scheme is developed in MATLAB-SIMULINK model and steady-state performance is experimentally verified for non-linear load.

KEYWORDS:

• Cascaded H-bridge
• Capacitor balancing
• D-STATCOM
• Model predictive control
• Optimized function
• Weighted factors

Additional information

Notes on contributors

Y. Srinivasa Rao

Yarlagadda Srinivasa Rao received his BTech degree from Jawaharlal Nehru Technological University, Kakinada, India, in 2009 and MTech degree from IIT, Roorkee, India, in 2011. He is currently working towards the PhD degree in the Department of Electrical Engineering, IIT Roorkee. He was associated with Lovely Professional University, Jalandhar, India, as an assistant professor during 2011–2013, where he actively participated in research work. His current research interest includes electric drives, power quality, active converters, and FACTS.

M. K. Pathak

Mukesh Kumar Pathak did his graduation in electrical engineering from L.D. Engineering College, Ahmedabad (Gujarat), India, in 1986. He joined Electrical Engineering Department of NIT, Kurukshetra (Haryana), India, as a Lecturer in 1987. In 1989, he joined Electrical Engineering Department of NIT, Hamirpur (HP), India, where he served till 2007. Presently, he is working as an Associate Professor in Electrical Engineering Department of IIT Roorkee, India, where he joined in 2007. He obtained both his MTech and PhD degrees from IIT Delhi, India. He has co-authored a book on Electric Machines, and published numerous research publications in reputed journals. He is a member of IEEE, life fellow of Institution of Engineering (India), life member of Indian Society of Technical Education (ISTE) and Systems Society of India (SSI). His current research includes artificial intelligence applications to drives, renewable energy, power quality, and FACTS. E-mail: [email protected]