Proportional?resonant based control strategy for grid?connected packed?E cell inverters with Lyapunov filter?based PLL

A proportional-resonant (PR)-based current control strategy for grid-connected packed-E cell (PEC) inverter is presented. Unlike the existing strategies, which are based on proportional-integral controller, developed packed-U and PEC inverters, proposed PR-based achieves zero steady-state error in grid current. Furthermore, it eliminates necessity of employing loop regulating dc capacitor voltages. Also, synchronization achieved by using a Lyapunov filter-based phase locked (PLL). The consequence PLL that sinusoidal signal can be extracted from distorted voltage. performances under steady-state, load variation non-ideal voltage investigated laboratory-scale experimental prototype. It reported both dc- ac-side variables system accomplished.