Active Power Ramp Characteristics and Frequency Instability in a 230 kV Industrial Transmission Corridor with Clustered Steel Furnaces

Large steel plants employing Electric Arc Furnaces (EAFs) and Induction Furnaces (IFs) impose rapid and stochastic active-power variations on power systems [1]. When such plants are clustered along a transmission corridor with limited inertia, aggregated MW ramps can propagate beyond local substations and manifest as measurable grid-frequency deviations [2]. This short paper presents a corridor-level technical analysis of frequency behavior observed in the Dhaka–Chattogram 230 kV industrial transmission corridor supplying three major steel producers. System-operator trend data indicate aggregate MW fluctuations of approximately 150–350 MW associated with frequency variations in the range of 49.85–51.10 Hz. The paper explains the physical origin of industrial MW ramping, highlights the moderating effect of Quantum EAF flat-bath and scrap-preheating operation at one plant, clarifies the limitations of Static Var Compensators (SVCs) for such disturbances, and outlines mitigation strategies aligned with the time scale of modern steelmaking load dynamics.