Design of Excitation Capacitance for Self-Excited Induction Generator
This paper presents simple and accurate approach to compute the minimum value of capacitance required for initiating the voltage build-up in a three-phase self-excited induction generator. Based on the steady-state equivalent circuit model different numerical methods for solving frequency are known from previous literature, which are of 6th order polynomial. In this paper the order of the polynomial is reduced to the 4th order frequency with a new, simple and direct method is developed to find the capacitance requirement. Critical values of the impedance and speed, below which the machine fails to self excite irrespective of the capacitance used, are found to exist.