Improving Power Response of Single-Controllable VSG-Based Active Distribution Network

Abstract

Controlling an active distribution network (ADN) from a single PCC has been advantageous for improving the performance of coordinated Intermittent RESs (IRESs). Recent studies have proposed a constant PQ regulation approach at the PCC of ADNs using coordination of non-MPPT based DGs. However, due to the intermittent nature of DGs coupled with PCC through uni-directional broadcast communication, the PCC becomes vulnerable to transient issues. To address this challenge, this study first presents a detailed mathematical model of an ADN from the perspective of PCC regulation to realize rigidness of PCC against transients. Second, an $H_{\infty}$ controller is formulated and employed to achieve optimal performance against disturbances, consequently, ensuring the least oscillations during transients at PCC. Third, an eigenvalue analysis is presented to analyze convergence speed limitations of the newly derived system model. Last, simulation results show the proposed method offers superior performance as compared to the state-of-the-art methods.