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... particularly under challenging conditions. This paper is described in the following sections: Section II details the microgrid description, Section III describes controller modeling, Section IV seamless transition logic, Section V gives results and discussion of the different scenario analysis, and Section VI concludes the work done in the paper. Fig. 1 illustrates a proposed MG configuration featuring three DG units that utilize VSI: GFM and GFL units. This setup is used to assess controller performance during network dynamics. It assumes that the dynamic characteristics of prime movers in DERs are simplified as DC voltage sources. Each DG unit connects to the bus via a three-phase ...
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... in the desired operating range, as shown in Fig. 3. When the corresponding MG parameters are matched with the grid parameters, the circuit breaker is closed; otherwise, it is open. The MG simulation model compares different scenarios involving the connection of GFM units with GFL units within a local network linked to a weak grid, as depicted in Fig. 1. The inverter switching controller modeling is shown in Fig. 2. MATLAB/SIMULINK is used to simulate this work, assessing MG's steady-state stability during network transitions in various conditions. The system parameters are uniform across all DG units, see Table I. Different case studies have been developed to examine stability and ...
Citations
In this study the grid impedance-based stability is concerned and improve the inverter stability for lower-voltage distribution networks. Also proposes the optimal filter and controller parameters for weak grids, considering IEEE std 519. The two methods are employed to enhance the inverter stability: (A). Changing the output impedance of the VSI by adjusting the grid-side inductance, (B). Optimizing the parameters for filter design and VSI controller. Ziegler-Nichols (ZN), Particle Swarm Optimization (PSO) and a real coded Genetic Algorithm (GA) are used to obtain the optimized CCL parameters to maintain the VSI stability and Total Harmonic Distortion (THD) level at the Point of Common Coupling (PCC) during the parametric uncertainty. The VSI-based system connected to the weak grid and in standalone mode is simulated on a real-time simulator, i.e., Typhoon HIL, to validate the effectiveness of obtained optimized CCL parameters by changing various conditions like filter inductance variation, grid Short Circuit Ratio (SCR), output power regulation and sudden load change in a standalone distribution network. The MATLAB/SIMULINK with m-files is utilized for the parameters optimization and controller model simulation purposes for VSI-based system. This paper presents a comprehensive review on how to choose the best inverter component parameters and their impact under different real-world conditions, whether the inverter is connected to the grid or not.
