Universal Decoupling Grid-Forming Control for Utility-Scale Distributed Energy Resources in Low-Strength Distribution Grids
Shenyuan Yu, Lina He · 2025
This paper presents an innovative decoupling grid-forming (GFM) control strategy for utility-scale distributed energy resources (DERs) within weak distribution networks. Traditional control methods often fall short in providing effective frequency (f) and voltage (V) regulation primarily due to their device-centric design and reliance on P-f and Q-V droop mechanisms. These mechanisms, while suitable for inductive transmission systems, overlook the resistive nature of weak distribution grids. Consequently, this oversight results in significant active power (P) and reactive power (Q) coupling, which degrades dynamic performance and stability. To address this challenge, the proposed model adopts a systematic perspective, meticulously considering the coupling dynamics within the distribution grid. Through rigorous MATLAB and OPAL-RT simulations, this paper demonstrates the ability of the proposed control scheme to achieve precise P and Q decoupling. This enables DERs to offer accurate, autonomous f and V control, significantly improving grid stability and response. This work represents a substantial advancement in GFM control technology, addressing critical limitations in existing practices.