Frequency Stability and Performance Analysis of Grid Forming Inverter in Grid-Tied Mode Using AC Current Limitation

International Journal of Electrical and Electronics Engineering

© 2025 by SSRG - IJEEE Journal

Volume 12 Issue 4

Year of Publication : 2025

Authors : Hetal Desai, Shweta Dour, Pramod Modi

10.14445/23488379/IJEEE-V12I4P114

How to Cite?

Hetal Desai, Shweta Dour, Pramod Modi, "Frequency Stability and Performance Analysis of Grid Forming Inverter in Grid-Tied Mode Using AC Current Limitation," SSRG International Journal of Electrical and Electronics Engineering, vol. 12,  no. 4, pp. 201-209, 2025. Crossref, https://doi.org/10.14445/23488379/IJEEE-V12I4P114

Abstract:

Integrating renewable distributed generation with a grid-tied Grid Forming Inverter (GFI) in AC power systems is essential for voltage amplitude and frequency stability. Frequency stability and its performance are governed by classical mechanics in AC power systems having high inertia. Grid-Forming Inverter control strategy is widely accepted by researchers for seamless integration with renewable distributed generation networks. The prime advantage of the GFI control strategy is low inertia compared to conventional Synchronous Machines (SMs). As a result, it provides a fast control response to maintain system stability incorporated due to Synchronous Machines (SMs). An inverter may be compelled to operate in a current-limiting mode that modifies inverter dynamics during grid emergencies like faults, voltage decreases, or frequency and phase jumps. As a result, it is susceptible to losing grid synchronization. In this paper, the system of Synchronous Machine and GFI (low inertia) with AC current limitation control strategy is being introduced. To maintain an appropriate power profile, mitigate load disturbances and limit over current, the AC current limit technique in GFI is used, which introduces reference current restricted to the maximum (Saturated) allowable current value. Frequency stability is taken as a performance parameter here. MATLAB Simulink simulates complete systems with SMs, Droop Control Strategy at SMs side, GFI with voltage and current loop to generate switching time, and AC current limitation techniques. The frequency, voltage and power dynamics have been studied for load disturbance conditions.

Keywords:

Droop control, Grid forming inverter, AC current limiter, inertia, Frequency stability.

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