TITLE:
Investigational Validation of PV Based DCD-MLI Using Simplified SVM Algorithm Utilizing FPGA Tied with Independent Sources
AUTHORS:
M. Valan Rajkumar, P. Prakasam, P. S. Manoharan
KEYWORDS:
Diode-Clamped-Multilevel Inverter (DCD-MLI), Space Vector Modulation (SVM), Field Programmable Gate Array (FPGA), Total Harmonic Distortion (THD), Photovoltaic (PV) System
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.11,
September
20,
2016
ABSTRACT: This
paper presents the independent source tied photovoltaic (PV) based three-phase
three-level diode-clamped-multilevel inverter (DCD-MLI) utilizing field
programmable gate array (FPGA) controller. The maximum power point (MPP) is
tracked by using fuzzy logic algorithm. Employed for gating signal generation,
the space vector modulation (SVM) strategy eradicates the complexity in determining the reference vector location, the ON-time
calculations and switching state selection. A digital proportional integral
(PI) control algorithm is implemented on a FPGA to keep the current injected
into the independent source (grid) sinusoidal and to achieve high dynamic
performance with low total harmonic distortion (THD) of output voltage and
output current which are 0.97% and 1.26%. With the proposed configuration, the adjustments of
modulation index and phase angle are synthesized onto a FPGA by means of hardware description
language (VHDL). The efficacy of the scheme is verified through simulation
study. To confirm the feasibility of the scheme, experimental studies are
carried out on a scaled-down laboratory prototype.