Grid-tied Multilevel Inverter with
Phase-locked Loop Algorithm
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abstract
A multilevel inverter is an electronic device capable of changing direct current energy
to alternant current energy with a voltage and frequency established by the user.
They are ideal for connecting renewable energy sources to the AC grid, energy
plants, and smart grids. The voltage must be balanced and synchronized with the
electrical network for adequate performance. This paper shows the voltage
synchronization between an inverter output voltage and the AC grid using a phaselocked loop based on an adaptive observer. The proposed algorithm can perform
under grid uncertainties such as noise and generates a reference signal for the
modulation used in the inverter. The algorithm is robust and computationally efficient
and can be implemented through basic elements such as operational amplifiers,
resistors, and capacitors, reducing its difficulty in executing it in a system.
