The Cause of Insufficient Damping in Phase-Locked-Loop and Its Influence

Conference · Sun Jul 16 04:00:00 EDT 2023 · 2023 IEEE Power & Energy Society General Meeting (PESGM)

DOI:https://doi.org/10.1109/pesgm52003.2023.10252612· OSTI ID:2202809

Wang, Zhengyu ^[1]; Fan, Lingling ^[2]; Miao, Zhixin ^[2]

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1. University of South Florida,Department of Electrical Engineering,Tampa,FL,USA,33620; University of South Florida
2. University of South Florida,Department of Electrical Engineering,Tampa,FL,USA,33620

Phase-locked loop (PLL) is a critical component that synchronizes grid-following (GFL) inverter-based resources (IBR) to the grid. Insufficient damping in PLL has been identified as a cause associated with real-world weak grid stability issues. This paper reveals that the second-order low-pass filter deployed in a sophisticated PLL structure can have negative influence on damping performance and lead to system instability when the grid is weak and power generation is low. Improving the PLL damping is illustrated as one of the mitigation approaches. The dynamic study is carried out in electromagnetic transient (EMT) simulation environment. In addition to EMT demonstration, a simplified analytical model of PLL is developed to represent a PLL with the sophisticated structure. The resulting overall analytical model of the entire system is then used for eigenvalue- based analysis to illustrate the influence of PLL on dynamic modes.

• Research Organization: University of South Florida
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
• DOE Contract Number: EE0008771
• OSTI ID: 2202809
• Conference Information: Journal Name: 2023 IEEE Power & Energy Society General Meeting (PESGM)
• Country of Publication: United States
• Language: English