Modeling of A Realistic DC Source in A CVSR

TL;DR

This paper models a CVSR with a realistic DC source, analyzing its magnetic flux, induced voltages, and power exchange, highlighting differences from ideal source models using a gyrator-capacitor approach.

Contribution

It introduces a realistic DC source model for CVSR and investigates its effects on core flux, voltages, and power flow, advancing the understanding of practical CVSR operation.

Findings

Realistic DC source affects flux density and voltage behavior.

Power interchange varies with source type during normal operation.

Modeling approach improves accuracy of CVSR behavior prediction.

Abstract

Continuously Variable Series Reactor (CVSR) can adjust the total reactance in an ac circuit using the saturation characteristic of the ferromagnetic core, shared by an ac and a dc winding. The bias magnetic flux produced by the dc winding can regulate the equivalent ac inductance in order to control power flow, damp oscillations, or limit fault currents. Gyrator-Capacitor approach is used to model the interface between the magnetic and the electric circuits. Two different dc control source models are considered: the usual ideal dc source and a realistic dc source composed of a power electronics-based converter and an ac voltage source. This paper investigates CVSR's behaviour in terms of induced voltage across ac winding, flux densities (B) throughout the CVSR core, and power interchange with the dc control circuit during normal conditions in both cases.