Optimized PID controller for both single phase inverter and MPPT SEPIC DC/DC converter of PV module

Introduced here is an implementation of an optimized Proportional, Integral, and Derivative (PID) controller that controls single-phase inverter and single-ended primary-inductor DC/DC converter (SEPIC). The main improvement is the endowment of classical PID controller with gradient-descent optimization method, which generates exact values for PID-controller parameters K_p, K_i, and K_d, which in turns track the maximum power. The method was applied post-use of Ziegler-Nichols method, reducing optimization time. SEPIC maximum-power-point tracker (MPPT) ensures optimal utilization of PV cells. The method further proves its efficacy in variable-load conditions. TMS320F28335 DSP has been used to implement the controlled pulse width modulation (PWM). The controlled system has been verified by simulation and implemented in a prototype. Then, experimental results have been compared with those for conventional single-phase inverter.