An Enhanced Distributed Voltage Regulation Scheme for Radial Feeder in Islanded Microgrid

Abstract

Even the simplest version of the distribution networks face challenges such as maintaining load voltage and system frequency stability and at the same time minimizing the circulating reactive power in grid-forming nodes. As the consumers at the far end of the radial distribution network face serious voltage fluctuations and deviations once the load varies. Therefore, this paper presents an enhanced distributed control strategy to restore the load voltage magnitude and to realize power-sharing proportionally in islanded microgrids. This proposed study considers the voltage regulation at the load node as opposed to the inverter terminal. At the same time, a supervisory control layer is put on to observe and correct the load voltage and system frequency deviations. This presented method is aimed at replacing paralleled inverter control methods hitherto used. Stability analysis using system-wide methodical small-signal models, the MATLAB/Simulink, and experimental results obtained with conventional and proposed control schemes verify the effectiveness of the proposed methodology.

A Mixed integer linear programming‐based distributed energy management for networked microgrids considering network operational objectives and constraints

“…As an efficient form of integrating local distributed energy resources (DERs) and providing carbon-free energy, an increasing number of microgrids have been installed in the last decade [1]. In a grid-connected operation, microgrids can support economic and reliable operation of distribution grids via various kinds of regulation services [2][3][4] and other methods. During extreme weather events, microgrids can transform into an islanded operation and provide uninterrupted power supply [5].…”

Robust Scheduling of Networked Microgrids for Economics and Resilience Improvement

“…Normally, a microgrid is connected to a utility grid through the Point of Common Coupling (PCC) but has the capability of operating independently [1]. When connected to the utility grid, a microgrid can not only import power from or export power to the utility distribution network under different operational conditions, but also provide various kinds of ancillary services, e.g., frequency regulation, voltage support, virtual inertia, etc., to the utility grid [2][3][4]. For energy consumers, a microgrid can reduce carbon emission, improve energy efficiency, and serve low-cost and clean energy.…”

An MILP-Based Distributed Energy Management for Coordination of Networked Microgrids

“…In addition, a microgrid could facilitate the secure and efficient operation of the utility grid by providing operational supports in many aspects, e.g., frequency and voltage regulation, virtual inertia, etc. [1][2][3][4]. As a unique virtue, a microgrid could seamlessly transit from grid-connected to islanding operation and continue to supply its local customers independently [5,6].…”