Work

PLL Frequency Stability Enhancement Under Weak Grid Considering Reactive Current Support

Year: 2025

Type: article

Abstract: The phase-locked loop (PLL) plays an essential role for synchronizing renewable power generation to the grid. However, as per the grid-code compliance for reactive current support, the PLL output frequency fluctuates significantly and exceeds the limitation, which seriously threaten the safe supply of electricity. In this paper, the underlying theoretical mechanism and dominant force behind the maximum PLL frequency deviation are revealed. Accordingly, two feasible approaches are proposed to enhance the PLL frequency stability with validations in experimental results.

Source: CES Transactions on Electrical Machines and Systems

DOI: 10.30941/cestems.2025.00007

Authors: Bin Hu, Ling Zhan, Heng Nian, Donglian Qi

Institution: Zhejiang University

Language: English

Topic: Microgrid Control and Optimization

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: diamond

Funders: National Natural Science Foundation of China, China Postdoctoral Science Foundation, Science and Technology Program of Zhejiang Province