Fast Estimation of Phase and Frequency for Single-Phase Grid Signal

Abstract

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Modified phase locked loop for grid connected single phase inverter

“…The voltage sag effect didn't show any change in the time delay adjustment as the deviation in frequency settled to less 0.5Hz in less than one cycle (0.02 sec). The results were also benchmarked against results obtained in [18] to verify the efficiency and accuracy of the proposed technique. Table 1 summaries the steady state performance as obtained from the proposed MTDPLL and from SOGI-FLL and AO methods.…”

“…The results in Table 1 showed that the proposed MTDPLL produced a comparable performance in terms of steady state error and settling time given the simplicity of the proposed technique. [18] Finally, the effect of low order harmonic distortion is examined. Figure 11 shows the harmonic content in the grid signal that has been used in this part of the simulation.…”

“…Recently, research topics such as; Discrete Fourier Transform [6,7], Kalman filtering [8,9], least-squares estimation [10], Artificial Neural Networks [11], the Enhanced PLL technique [12], Second Order Generalized Integrator (SOGI) [13], and Inverse Park Transform (IPT) based PLL methods [14], have been implemented to estimate the phase and frequency of the grid. As reported in [15][16][17][18] one of the major challenges faced by various PLL schemes is to present immunity against the high frequency disturbances and low order harmonics, while at the same time to maintain a reasonable dynamic response in case of frequency and phase jumps. Various modifications and enhancements have been made to improve PLL performance under various grid conditions.…”

“…Various modifications and enhancements have been made to improve PLL performance under various grid conditions. Methods presented in [12][13][14] offer well-established synchronization techniques and can filter high frequency harmonics; however, they suffer from immunity against low order harmonics according to [15][16][17][18].…”

“…In [18] a comparative time domain performance evaluation of adaptive techniques; such as Pseudo Linear -enhanced PLL (PL-EPLL), SOGI -Frequency Locked Loop (SOGI-FLL) and Adaptive sliding mode Observer (AO) for various grid condition is presented. However, the effects of lower order harmonics on estimating the phase and frequency of the grid using these techniques were not reported.…”