Use of Super Conductor Magnetic Energy Storage System and FACTS Devices for Two-Area Load Frequency Control Having Synchronous Generators and DFIG Wind Generators

Abstract

The load change in a synchronous generator (SG) based power generation system is common which will mainly influence the change in voltage, power flows, frequency, load angle and burden of transmission lines and transformers due to change in current flow. The study which analyses the behavior of load change, compensating devices and its impact on change in frequency and real power flow is termed as load frequency control. The generators like Doubly Fed Induction Generator (DFIG), SG are supplying power in one area, and a total of two areas are considered in this paper. The load change is done in area-1 only and a change in frequency is observed in both areas. Two cases, one with thyristor-based controller capacitor storage phase shifters (TCPS) and the other with a superconducting magnetic storage system and hybrid models of such are done and in another case, Flexible AC Transmission devices such as TCPS, SSSC, UPFC and IPFC are used. Earlier authors have shown that compared to battery and ultra-capacitors, superconductor magnetic energy storage system (SMES) plays a vital role and few authors observed frequency regulation with different FACTS devices. Hence, we extended with SMES and FACTS devices and also in a coordinated manner to observe which combination gives better performance for the same disturbance. Using MATLAB software, the frequency change is observed in both cases, in the first case, TCPS is found better and in the second case, IPFC is found better in compensating the frequency change.