RGA-Based Stabilizer for Stability Enhancement Using Local and Wide-Area Signals

Abstract

The chapter proposes a combination of conventional power system stabilizer (CPSS) and wide-area power system stabilizer (WAPSS) controller for enhancing the synchronous generator rotor angle stability by damping the local and inter-area mode of oscillations. From wide-area monitoring system (WAMS), based on the observability of the wide-area signal, the input to WAPSS is the inter-area tie-line power signal. The robustness of the proposed controller has augmented by optimal tuning of the parameter of the controller using the real-coded genetic algorithm. The objective for optimal tuning of the parameters is formulated based on the damping ratio. The strategy adopted to tune the parameter to make the system stable is by defining a D-shaped safe zone in the s-plane, to shift the eigenvalues to the stable region. The effectiveness of the proposed controller has justified by testing it in a multi-machine system under the different operating conditions and system loading, and the performance of the controller is evaluated by comparing with CPSS alone and reside-based wide-area PSS (RWAPSS), respectively.