A State Space Discrete-Time Realization of the Three-phase Generalized Second-Order Integrator Frequency Locked Loop

In this paper, a discrete three-phase second-order generalized integrator frequency-locked loop system model is designed. The fundamental positive and negative sequence components of the common coupling point after the fault are accurately extracted in C language simulation. The fifth harmonic of the most significant component of the general fault is filtered to less than 15% of the input content. At the same time, the discrete three-phase second-order generalized integrator frequency-locked loop can accurately track the fundamental frequency change of the common coupling point and has high steady-state accuracy and good dynamic performance.