<i>dq</i>-Frame Impedance Modeling of Three-Phase Grid-Tied Voltage Source Converters Equipped With Advanced PLLs

With the increased prevalence of power converters in systems, especially three-phase voltage source (VSCs), stability analysis electronics-based systems has received much attention recently. To this end, different impedance models, such as dq -domain, sequence-domain, and phasor-domain models among others, have been developed for VSCs recent years. A common trend all these which no noticeable practical advantage compared to each other, is considering a standard synchronous reference frame phase-locked loop (SRF-PLL) synchronization VSC with grid. The SRF-PLL, however, limited filtering ability and, therefore, may not be very most applications. deal shortcoming great number advanced PLLs proposed literature. These feedback/feedforward loops filters their structures, make including dynamics available complicated. Bridging gap research objective article. it demonstrated that an alternative representation, can easily obtained included -frame model. Several case studies are presented verify idea.