UNIFIED POWER FLOW CONTROLLER USING A POWER ELECTRONICS INTEGRATED TRANSFORMER

This paper presents a Unified Power Flow Controller (UPFC) application of the Custom Power Active Transformer (CPAT);
a power electronics integrated transformer which provides services to the grid through its auxiliary windings. The CPAT structure integrates three single-phase transformers
into one shunt-series combining transformer. This integration empowers a sub-station with the capability of dynamically regulating the terminal voltage and current
of a transformer through isolated power electronics converters. This paper investigates the CPAT’s capability to
provide UPFC services which includes power flow control, reactive power compensation, voltage regulation and harmonics elimination. Moreover, the impact of the CPAT-UPFC during load perturbations on the power system is investigated to further validate its transient and steady-state response. Furthermore, an experimental prototype reveals the operation of the three-phase CPAT-UPFC confirming its stable operation according to the theoretical expectations.