AC-Chopper-Based Inrush Current Suppressor in a Wind Power Generation System with Squirrel-Cage Induction Machines

Abstract

This paper proposes the inrush current suppressor using an AC chopper in a large-capacity wind power generation system (WPGS) with two squirrel-cage induction machines (SCIMs), which are switched over depending on the wind speed. The input side of the AC chopper is connected to the source in parallel. The output side of the AC chopper is connected in series with the SCIM through matching transformers. In the proposed inrush current suppressor, the output voltage of the AC chopper is the same as the receiving-end voltage before connecting the SCIM. By gradually decreasing the output voltage of the AC chopper, the applied voltage of the SCIM is gradually increased without the inrush current. The basic principle of the proposed inrush current suppressor is discussed in detail. A computer simulation is implemented to confirm the validity and practicability of the proposed inrush current suppressor using a power system computer-aided design/electromagnetic transients including DC (PSCAD/EMTDC). Simulation results demonstrate that the proposed inrush current suppressor can suppress the inrush current.

Digital Soft Start Implementation for Minimizing Start Up Transients in High Power DAB-IBDC Converter

“…In high power energy systems, it is strongly advised to remove the inrush current completely because it can affect the source and loads. Therefore, every high-power converter and inverter circuit is being designed with start-up topologies to avoid or reduce the inrush current [3,4]. In the below Figure 1, the given plot is shown that the inrush current effect at converter circuit in both cases that with soft-start and without soft-start.…”