Chapter 10 - Finite position set phase-locked loop operating under nonideal grid voltages

Abstract

This chapter introduces the finite position set phase-locked loop applied to the grid position estimation. In this way, the grid angle is computed using the predicted behavior of the positive sequence of the grid voltage and using the minimized cost function. This function selects the optimum angle by means of a finite set of grid positions. This method is based on MPC and it does not need PI controllers that are common in phase-locked loop applications. The positive sequence of the grid voltage in the fundamental components is achieved using a dual second-order generalized integrator and a moving average filter to increase the performance of the finite position set phase-locked loop when the grid voltages have distortions due to harmonic elements.