Reduce Order Damping Controller Design for Interconnected Power System

Abstract

For smooth working of a power system, it is necessary that all generators working in a power system must be synchronized i.e., operate at some fixed constant frequency. In power system generators and loads are connected through a network. If any generator deviates from synchronous speed due to some fault, resultantly all generators in system gets also affected. In the presence of disturbance low frequency oscillations produce and propagate in all machines. A safe operation of an interconnected Power System is mainly depended on sufficient damping of these oscillations. Thus, if a proper control mechanism is not used in Power System, there are high chances of blackout. This research develops a controlling mechanism of low frequency oscillations by using control system theory. In this research a reduce order H-infinity damping controller is design by using Loop Shaping technique. The designed controller is a low-cost solution for such problems with much better results in modern interconnected Power Systems. To test effectiveness of designed controller a prototype model of inter-connected New England test system (NETS) and New York power system (NYPS) is taken. The time domain simulation of disturbed system without and with controller has been performed by using MATLAB. Results shows that the developed controller successfully removes the low frequency oscillations, maintains synchronism among generators and guarantees the stability of Power System