VOLTAGE REGULATION OF SEIG USING SHORT AND LONG SHUNT CAPACITORS

Abstract

Self excited ir►cluction generators (SEIG)' have rugged construction, lower 1111i1 cost, relative case of operation and maintenance compared to conventional synchronous generators. Slitis are being used in place of synchronous generator to harness energy in the range of few K to one MW from renewable energy sources . In literature considerable information about the self excitation pltenomcnot and steady state operation of SFR; is available, but not enough attention has been given to the transient performance. The bottleneck shown in the literature about the applicability of SEl0 its inherent poor voltage regulation, and the consequent requirement of a well designed wimp regulator. 'The cost, complexity, and operational problem vitiate the advantages gained in usinf induction machine for isolated mode operation. The dissertation work was carried out with the objective of developing ncv methodology for improvement in voltage regulation and to study the suitability of SEl0 nude different operational conditions. To start with steady state analysis of SEIG with static load is critical'. analyzed. The effectiveness of developed algorithm is verified under different conditions and lo different machines. Effect of capacitance on performance of SEIG is studied to enable selectio of a suitable capacitor for given operating conditions. Observation are made on the effect c prime mover speed on the performance of SEIG. The steady state analysis is done with the help of NEWTON-RAPIISON technique Following the steady state analysis, response of SEIG under differet transient conditions is studied to know its suitability under sudden switching. The generalize d-q axis model, which is used for the analysis of an induction machine is developed for under stationary reference frame. In this nonlinear differential equations are solved by fourt order RUNGS-KUTTA method.