Computational Performance Analysis of an Electromagnetic Dynamic Voltage Restorer: Physical Conception and Operational Approaches

Abstract

The present paper focuses an electromagnetic device to restore busbar voltages to acceptable limits using an electromagnetic arrangement conception. The new device has been called by electromagnetic dynamic voltage restorer (EDVR) due to its physical structure. As for the insertion of the degree of the series voltage compensation, two approaches are considered. The first can be recognized as a discrete procedure as the restoring voltage procedure makes use of electronically switched tap changers. The second relies on a continuous voltage variation offered by a single tap supply and a controllable electronic device. It is shown that the overall compensator idea lies on positive or negative insertion of a variable voltage in series with de feeder so as to achieve a consumer supply voltage in accordance with acceptable levels. The device comprises a traditional shunt autotransformer linked to a series transformer which provides the necessary restoring property. The paper highlights the EDVR physical structure, the control units, the ATP platform models and results associated to case studies to show the overall compensation equipment and control performance offered by the given solutions.