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Modified Dual Second-order Generalized Integrator FLL for Frequency Estimation Under Various Grid Abnormalities

Patil K. R., Patel H. H.

Transactions on Environment and Electrical Engineering

2016

Vol. 1, No. 4

10--18

Proper synchronization of Distributed Generator with grid and its performance in grid-connected mode relies on fast and precise estimation of phase and amplitude of the fundamental component of grid voltage. However, the accuracy with which the frequency is estimated is dependent on the type of grid voltage abnormalities and structure of the phase-locked loop or frequency locked loop control schemes. Among various control schemes, second-order generalized integrator based frequency- locked loop (SOGI-FLL) is reported to have the most promising performance. It tracks the frequency of grid voltage accurately even when grid voltage is characterized by sag, swell, harmonics, imbalance, frequency variations etc. However, estimated frequency contains low frequency oscillations in case when sensed grid-voltage has a dc offset. This paper presents a modified dual second-order generalized integrator frequency-locked loop (MDSOGI-FLL) for three-phase systems to cope with the non-ideal three-phase grid voltages having all type of abnormalities including the dc offset. The complexity in control scheme is almost the same as the standard dual SOGI-FLL, but the performance is enhanced. Simulation results show that the proposed MDSOGI-FLL is effective under all abnormal grid voltage conditions. The results are validated experimentally to justify the superior performance of MDSOGI-FLL under adverse conditions.

Application of Frequency Locked Loop in Consumption Peak Load Control

Perišić D., Žorić A., Obradović S., Spalević P.

Przegląd Elektrotechniczny

2012

R. 88, nr 1b

264-267

This article describes the application of the Frequency Locked Loop (FLL) in the Consumption Peak Load Control (PLC). The digital content of FLL represents the main information for optimal control. Particular significance was given to the description of the extended FLL, which is suitable for this application. Detailed solutions of FLL input module and FLL adjustments are given. The performances of the realized PLC System are demonstrated by the graphics, which are recorded on the applied PLC System.

W tym artykule opisano zastosowanie Frequency Locked Loop (FLL) do sterowania obciążeniem szczytowym Peak Load Control (PLC). Szczególne znaczenie nadano opisowi rozszerzonego FLL, który jest odpowiedni dla tej aplikacji. Podano szczegółowe rozwiązania w module FLL wejściowych i korekt FLL . PLC.