Performance analysis of SLMS based control for PV-STATCOM using a CHB-MLI

ABSTRACT

Due to a phenomenal increase in non-linear/linear loads in the last two decades, power quality (PQ) has been a major concern nowadays. PQ issues and solutions for problems such as injection of harmonics by non-linear loads, voltage regulation, power factor correction etc. are current topics of research. So, harmonic mitigation using a Cascaded-H Bridge Multilevel Inverter (CHB-MLI) is the focus of this paper. In this paper, photovoltaic Static compensator (PV-STATCOM) is designed and simulated; its working is checked in two modes. In mode-I, both active and reactive power are supplied to the grid, which is performed during day time only. In mode-II, only reactive power is supplied to the grid, and this mode works during night time. Therefore, the proposed PV-STATCOM can be utilised to its full potential throughout the day. A new proposed adaptive control technique-Sigmoid Least mean square (SLMS) and PV feed-forward term are combined to generate reference currents. Phase shift pulse width modulation (PS-PWM) technique is implemented to generate the pulses. The complete system is simulated in both the modes under various load conditions. Hardware results for the developed five-level MLI prototype are also illustrated.

KEYWORDS:

• PV-STATCOM
• CHB-MLI
• MPPT
• PS-PWM
• SLMS

Acknowledgement:

The authors are thankful to the Department of Science and Technology, Government of India for the Sponsored research project

Disclosure statement

No potential conflict of interest was reported by the authors.