A Review of Synchronous Fixed-Frequency Microgrid Control Methods and Power Allocation Strategies

Abstract

Guided by the dual-carbon goal, new energy generation has become the focus due to its environmentally friendly, renewable and low-emission characteristics. As a bridge for the transformation of the smart grid, the microgrid effectively integrates distributed energy resources and loads to promote the green transformation of the energy system. This paper focuses on the AC microgrid, especially its fixed-frequency control method, which aims to ensure frequency stability. The article first examines the shortcomings of traditional control methods and then introduces the concept of fixed-frequency control. The fixed-frequency control strategy is then refined into three categories: phase angle droop, voltage fixed-frequency VI droop, and virtual impedance droop. Targeted improvement measures to optimize power distribution are outlined. Finally, a comparative analysis of the characteristics of each method points the way forward for future research.