Grid-Forming Controllers in the Distribution Network Landscape

Abstract

The rapid expansion of renewable capacity is reshaping the power system landscape by introducing new actors into play, such as prosumers and energy communities, that would play a key role in the stability of the network under the distribution system landscape. This acceleration in the deployment of PV, wind and battery systems is leading to an extended use of advanced control strategies that mitigate the loss of inertia, flexibility and support towards the grid, so-called grid-forming (GFM) control. The decline of conventional synchronous generators has reduced native system inertia, leaving networks, both at the transmission and distribution levels, more vulnerable to instability. This reduces massively the time available for actuation to avoid escalated fault scenarios. In this regard, GFM technology offers a potential solution for synthetic inertia emulation and dynamic support for both voltage and frequency deviations, making it a key tool for enhancing stability in renewable-dominated distribution networks of the future. However, large-scale deployment increases the risk of oscillations and uncontrolled interactions due to voltage regulators and synchronization mechanisms or islanding procedures. The paper aims to address these challenges by developing a step-by-step analysis to ensure a safe, reliable and coordinated integration of distributed GFM resources in future power systems, validating them in realistic distribution network environments.