Supplementary Feedforward Voltage Control in a Reconfigurable Distribution Network

TL;DR

This paper introduces a robust feedforward voltage control strategy for reconfigurable distribution networks, enhancing real-time voltage regulation during network reconfiguration and load restoration by preemptively compensating voltage deviations.

Contribution

It develops a new robust optimization-based feedforward control method for voltage regulation in reconfigurable distribution networks, considering uncertainties and dynamic network reconfiguration.

Findings

The proposed FVCs effectively reduce voltage deviations during network reconfiguration.

Robust control design improves voltage regulation under parameter uncertainties.

Case studies confirm the strategy's effectiveness across various operating conditions.

Abstract

Network reconfiguration (NR) has attracted much attention due to its ability to convert conventional distribution networks (DNs) into self-healing grids. This paper proposes a new strategy for real-time voltage regulation (VR) in a reconfigurable DN, whereby optimal feedforward control of synchronous and inverter-based distributed generators (DGs) is achieved in coordination with the operation of feeder line switches (SWs). This enables preemptive compensation of upcoming deviations in DN voltages caused by NR-aided load restoration. A robust optimization problem is formulated using a dynamic analytical model of NR to design the feedforward voltage controllers (FVCs) that minimize voltage deviations with respect to the H infinity norm. Errors in the estimates of DG parameters and load demands are reflected in the design of optimal FVCs through polytopic uncertainty modeling, further improving the robustness of the proposed VR strategy. Small-signal analysis and case studies are conducted, demonstrating the effectiveness of the optimal robust FVCs in improving real-time VR when NR is activated for load restoration. The performances of the proposed FVCs are also verified under various operating conditions of a reconfigurable DN, characterized principally by SW operations, network parameter errors, and communication time delays.