Performance analysis of shunt, short shunt and long shunt self excited induction generator: Analysis of shunt, short shunt and long shunt SEIG

This paper presents a simple method for the steady state analysis of a self excited induction generator (SEIG) operating in shunt, short shunt and long shunt configurations. The method is based on solution of nonlinear equations obtained through impedance model of steady state equivalent circuit of a single phase SEIG. The circuit model of SEIG is developed in a generalized manner to accommodate all three modes of operation by changing series capacitance placements. The developed model is used to obtain various performance characteristics of SEIG configurations through computer simulations. For the veracity of proposed method, results of shunt model are validated through experimental investigation on a 1hp, 220/230 volts single phase induction motor. An analysis of results establishes the fact that for optimum SEIG performance it is imperative that shunt and series capacitances are chosen optimally for each configuration. The optimum value of shunt capacitance for shunt and short shunt models comes out to be the same. However, to get optimum values of capacitances for long shunt model a slightly different approach has to be adopted. The optimum values of shunt and series capacitances for each configuration are reported in the paper. Finally, the paper is concluded by comparing performances of three SEIG models operating with optimum parameters.