Alternative unified power flow controller using energy storage

This paper describes a new topology of an intelligent power compensation system utilizing energy storage to enhance power system performance and reliability. The system can also provide all the benefits associated with a unified power flow controller (UPFC). In one single device, the alternative unified power flow controller (AUPFC) can provide (i) fast control of real and reactive power along a transmission corridor, (ii) phase angle control, (iii) series compensation, (iv) shunt reactive power compensation, (v) harmonic compensation, (vi) load leveling, (vii) voltage stability improvement and (viii) back-up supply. These UPFC's can provide improved power system operation and control, added system security and reduced power system losses.