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<p>Deterioration in the performance of the grid-tied system due to nonlinear loads such as static power converters need to be improved. Further, adequate filter structures and precise synchronisation schemes are mandatory for interfacing converters to electrical grid. In this paper, a novel cascaded hybrid-based phase-locked loop (PLL) synchronisation technique is designed using a Least mean square (LMS) and a Second Order Generalised Integrator (SOGI) filter for testing the dynamic performances under adverse grid conditions. The proposed cascaded hybrid (H-LMS-SOGI) PLL is used as a phase detector (PD) of the PLL for detecting the phase angle. This hybrid PLL is able to eliminate the dc offset and harmonics associated with polluted grid voltage. Analysing and testing of the dynamic performances has been done by comparing the proposed H-LMS-SOGI PLL with cascaded LMS-PLL (CLMS-PLL), cascaded SOGI PLL (CSOGI-PLL), single LMS and single SOGI under adverse grid conditions. The simulation results are obtained using MATLAB Simulink environment. The experimental results are obtained on a prototype developed in the laboratory using single phase programmable supply (Gwinstek APS1102) with dSPACE 1104 and digital storage oscilloscope (Keysight DSO X-214A). The results show the steady state and dynamic performance of the proposed H-LMS-SOGI PLL under non-ideal grid conditions like30% voltage sag and 35% swell, + 5&#xa0;Hz frequency change, 30o phase shift, 20% dc offset and polluted environment. Stability analysis of the proposed PLL w.r.t conventional CLMS-PLL, and CSOGI PLLis discussed through the bode plots and pole-zero map of H-LMS-SOGI PLL. The application of the proposed hybrid technique is also tested for inverter control and load compensation.</p>

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Design of hybrid LMS-SOGI-based phase-locked loop tested under adverse grid conditions

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Oinam Lotika Devi,
  • Alka Singh

摘要

Deterioration in the performance of the grid-tied system due to nonlinear loads such as static power converters need to be improved. Further, adequate filter structures and precise synchronisation schemes are mandatory for interfacing converters to electrical grid. In this paper, a novel cascaded hybrid-based phase-locked loop (PLL) synchronisation technique is designed using a Least mean square (LMS) and a Second Order Generalised Integrator (SOGI) filter for testing the dynamic performances under adverse grid conditions. The proposed cascaded hybrid (H-LMS-SOGI) PLL is used as a phase detector (PD) of the PLL for detecting the phase angle. This hybrid PLL is able to eliminate the dc offset and harmonics associated with polluted grid voltage. Analysing and testing of the dynamic performances has been done by comparing the proposed H-LMS-SOGI PLL with cascaded LMS-PLL (CLMS-PLL), cascaded SOGI PLL (CSOGI-PLL), single LMS and single SOGI under adverse grid conditions. The simulation results are obtained using MATLAB Simulink environment. The experimental results are obtained on a prototype developed in the laboratory using single phase programmable supply (Gwinstek APS1102) with dSPACE 1104 and digital storage oscilloscope (Keysight DSO X-214A). The results show the steady state and dynamic performance of the proposed H-LMS-SOGI PLL under non-ideal grid conditions like30% voltage sag and 35% swell, + 5 Hz frequency change, 30o phase shift, 20% dc offset and polluted environment. Stability analysis of the proposed PLL w.r.t conventional CLMS-PLL, and CSOGI PLLis discussed through the bode plots and pole-zero map of H-LMS-SOGI PLL. The application of the proposed hybrid technique is also tested for inverter control and load compensation.