A Unified Control Design of Three Phase Inverters Suitable for Both Grid‐Forming and Following Modes of Operation

ABSTRACT The primary cascaded control loops and the phase‐locked loop (PLL) can enable voltage source inverter operation in grid‐forming and grid‐following mode. This article proposes a unified control for such inverters with current control, voltage control, and power control loops, including the PLL impact on ‐ transformations as the building blocks. Small‐signal‐based linearization techniques are adopted to achieve the resultant linear time‐invariant model. Moreover, a systematic definition of the unified controller is proposed to ensure the easy portability of the controller code in a model‐driven development set‐up. Model verification and experimental results of a 5 kW inverter set‐up approve the efficacy of the proposed design approach.