A Novel Synchronously Rotating Reference Frame Based Adaptive Control Architecture for Enhanced Grid Support Functions of Single-Phase Inverters

Abstract

This article presents a novel adaptive control architecture for - connected single-phase inverters (SPIs) that can dynamically regulate active and reactive power, thus enabling grid support functions effectively. The base controller framework is that of the active and reactive power control in the dq-domain. The proposed controller is based on an adaptive minimum variance framework and utilizes an online parametric identifier. The advantage of the proposed scheme is that the architecture can concurrently provide voltage support and line power balancing capability with a performance factor greater than a static proportional-integral (PI) and proportional-resonant (PR) controller. First, the controller capability is evaluated on a proof of concept aggregated power grid model or a single machine infinite bus system. Then, the tests for concurrently providing line balancing and voltage support are conducted by connecting SPIs at several locations on an unbalance three-phase IEEE 123 node distribution system model. It has been demonstrated that the proposed architecture is adaptable and performs better (3% to 5% improvement in error) when compared to static PI and PR controller during varying operating conditions.