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.
Highlights
A reliable and stable distribution network represents a crucial aspect to successful power distribution to load demands
The simulations on MATLAB/Simulink are conducted on circuit configuration given in Figure 1 for three-phase 50 Hz islanded MG wherein the two paralleled connected DG1 and DG2 are connected to the RL load via feeder impedance X1–R1 and X2–R2
Case 1 outlines the results obtained with a conventional control scheme, while case 2 validates the effectiveness of the proposed control strategy
Summary
A reliable and stable distribution network represents a crucial aspect to successful power distribution to load demands. MG puts its contribution in a grid-dependent radial distribution system when load demand exceeds and power quality goes down. MG gives the power during the excess demand in grid-dependent systems, minimizes loss, and maintains power quality [17,18] It acts as a backup power source during the islanded mode of operation or gird failure situation, controls the loads, converts DC power into AC power, and promises security and protection [19,20]. The secondary control layers use to correct the voltage and system deviations in order to improve the power quality, while the tertiary control employs to interact with the main grid [46]. A distributed secondary control layer is employed to restore the load voltage and frequency deviations. It presents the simulation and experimental results in detail with a comparison of the conventional and proposed control scheme, and Section 5 concludes the paper
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