Fast Energy Storage with Bi-Directional Converter Controlled Super Capacitor Based UPQC

Abstract

In the proposed concept UPQC with Super Capacitor for fast energy storage super capacitor can be used. Modern power grids must be highly reliable and provide power with a high quality. Power quality issues like voltage sags or current harmonics must be minimized, in order to achieve high levels of reliability in the system. One possible way to overcome such problems is through the utilization of active power filters like a Unified Power Quality Conditioner (UPQC). On the other hand, Superconducting Magnetic Energy Storage (SMES) is one of the most promising superconducting devices, considering its possible applications in power systems. This concept contains a combination of a SMES with a UPQC for power quality improvement in an electric grid. Through the utilization of a SMES unit, it is possible to increase the stored energy in the DC link of the UPQC, thus improving the system capacity to overcome power quality issues. Voltage sags and current harmonics are simulated and the system behavior is demonstrated.