A Simple Yet Robust Mechanism for the Improvement of Phase-Locked-Loop System and its Verification with Grid Side Converter Control

다국어 초록 (Multilingual Abstract)

The increasing number of nonlinear loads and the integration of renewable energy sources into the grid make the conventional SRF-PLL less accurate for estimating the phase and frequency of the grid voltage. A variety of enhanced fi ltering-based PLLs have been reported in the literature to solve this issue. However, these techniques are computationally more complex.
For this reason, a method has been proposed to improve the performance of low pass fi lter (LPF)-based SRF-PLL, which is easy to implement and is computationally less expensive. In this paper, two in-loop second-order notch fi lters have been used with an LPF to nullify the eff ect of dominant lower order harmonics. The dynamic performance of the proposed technique is improved by implementing a PID type loop fi lter. The proposed scheme is compared with the other methods, like MRFPLL, conventional and LPF-based SRF-PLL. The response of the proposed PLL is found to be encouraging under diff erent grid disturbances. The effi cacy of the proposed PLL has been verifi ed by implementing the current controller to control the active and reactive grid current for the grid side converter in the hardware setup.

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