Investigations for Transient Stability Enhancement of Multi machine Power System Integrated with Large Scale Renewable Energy Sources using Modified Series Resonance type Fault Current Limiter

Abstract

The electrical power generation is augmented by the deployment of renewable energy sources newlineapart from the conventional synchronous generators (SGs). The wind energy, one of the extensively newlineextracted renewable resource is mainly derived using induction generators (IGs). The newlineIGs have different electrical performance characteristics depending on its type and hence their newlinebehaviour under faulty conditions are quite different as compared to synchronous generators. newlineThe researchers have proposed the peak current contribution of IGs during various faults at newlinepoint of common coupling (PCC) when connected to the single machine infinite bus (SMIB) newlinesystem. A number of researchers are pursuing to improve the low voltage ride through (LVRT) newlinecapability of wind farms i.e. ensure them to remain in synchronism with the grid despite of the newlinepower system disturbance. The literature available attempts various techniques for low voltage newlineride through improvement of grid-connected wind farms - either by modifications in control newlinetechnique or by using various fault current limiters (FCLs) mainly for various faults at PCC newlinewith SMIB. newlineThis research work presents investigations on performance evaluation of different types of newlineIGs operating in synchronism with SGs in a multi-machine power system by considering a high newlinepenetration of wind energy. The reactance diagram of multi-machine power system is deliberated. newlineA 3L-G fault is simulated at weak bus of the system and results are presented and analysed newlinefor induction generators and their short circuit current contributions. The research work proposes newlinea novel series resonance type fault current limiter and its implementation to improve newlineLVRT performance of wind farms connected in the multi-machine power system. The authors newlinehave analysed the system behaviour in case of symmetrical fault at point of common coupling newlinein the SMIB and at the weak bus in a multi-machine system. To check the effectiveness of the newlineproposed FCL, its performance is compared with the FCLs in the literature. The simulation newlinebased re