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Estimation of Amplitude, instantaneous phase and frequency of single-phase grid voltage signal have been studied in this paper. The proposed approach uses a novel circular limit cycle oscillator (CLO) coupled with frequency-locked loop (FLL). Due to the nonlinear structure of the CLO, the proposed frequency adaptive CLO technique is robust against various perturbations faced in the practical settings e.g. discontinuous jump of phase, frequency and amplitude. Global stability analysis of the CLO and local stability analysis of the frequency adaptive CLO has been performed. Experimental results demonstrate the effectiveness of the proposed technique over a very recent technique proposed in the literature.

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