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

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.