<div>This paper presents an improved selective harmonics elimination
technique for PV assisted single phase</div>


<div>grid-tied pulse width modulated (PWM) voltage source</div>


<div>inverter (VSI). The switching angles are determined offline</div>


<div>through numerical techniques and stored in microcontroller</div>


<div>memory as a function of modulation index md for online</div>


<div>application. For multiple solution, the solution which leads to</div>


<div>lower change of switching angles (α) from the previous md, is considered
for storing in the processor memory. This leads to less no. of sections
for the processor when a piecewise mixed model is considered for storing
the entire switching angle curve. This technique is well suited for
limiting voltage THD in two level grid connected VSI with L-C filter.
The verification of theoretical concept is done in laboratory prototype
of PV (500 W) connected to grid-tied PWM inverter. The control
environment is realized in embedded FPGA interfaced national instrument
hardware.</div>