Fast Grid Voltage Synchronization using Modified Frequency-locked Loop in Single Phase Grid-connected Power Systems

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Hassanpour H.; Ehsanian M.

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Journal Paper

Paper Information

Journal: International Journal of Engineering Year:2021 | Volume:34 | Issue:6 Page(s): 1430-1437

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Information Journal Paper

Title

Fast Grid Voltage Synchronization using Modified Frequency-locked Loop in Single Phase Grid-connected Power Systems

Author(s)

Hassanpour H. | Ehsanian M. | Issue Writer Certificate

Keywords

Phase-locked Loop

Phase jump

Second-order Generalized Integrator

Frequency-locked Loop

DC Offset

Abstract

One of the critical components for the efficient operation of single-phase grid-connected converters is the synchronization unit. This paper presents a fast and adaptive Phase-locked Loop (PLL) structure that ameliorates the dynamic response of the estimated frequency and amplitude for grid-connected single-phase power systems. The Second-order Generalized Integrator (SOGI) with a novel Frequency-locked Loop (FLL) is utilized which contains a DC Offset rejection loop. The proposed method not only eliminates the transient response of the estimated frequency which is produced by FLL in grid voltage phase angle jumps, but also improves the PLL dynamic characteristics. The whole system has been simulated in MATLAB Simulink environment where a very small settling time for the estimated frequency of the FLL has been achieved. Therefore, it will improve the whole dynamic parameters of the system. Based on the simulation results, the settling time for the estimated frequency and amplitude are 22 ms and 10 ms, respectively.

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