An Effective Current Limiting Strategy to Enhance Transient Stability of Virtual Synchronous Generator

TL;DR

This paper proposes an improved current limiting strategy for virtual synchronous generators that enhances transient stability, using the Equal Proportional Area Criterion for intuitive analysis and validating results through MATLAB/Simulink simulations.

Contribution

It introduces a novel current limiting strategy based on EPAC that effectively improves system stability compared to previous methods.

Findings

Proposed strategy shows superior stability in simulations

EPAC provides intuitive understanding of CL effects

Validated effectiveness through MATLAB/Simulink tests

Abstract

VSG control has emerged as a crucial technology for integrating renewable energy sources. However, renewable energy have limited tolerance to overcurrent, necessitating the implementation of current limiting (CL)strategies to mitigate the overcurrent. The introduction of different CL strategies can have varying impacts on the system. While previous studies have discussed the effects of different CL strategies on the system, but they lack intuitive and explicit explanations. Meanwhile, previous CL strategy have failed to effectively ensure the stability of the system. In this paper, the Equal Proportional Area Criterion (EPAC) method is employed to intuitively explain how different CL strategies affect transient stability. Based on this, an effective current limiting strategy is proposed. Simulations are conducted in MATLAB/Simulink to validate the proposed strategy. The simulation results demonstrate that, the proposed effective CL strategy exhibits superior stability.