Impedance Modeling With Stability Boundaries for Constant Power Load During Line Failure

Utkal Ranjan Muduli, Mohamed Shawky El Moursi, Iraklis P. Nikolakakos, Khalifa Al Hosani, Sayed Abdelaziz Mohammad, Tareg Ghaoud

    Research output: Contribution to journalArticlepeer-review


    Harbor cranes particularly use induction motors (IM) as the main prime mover, which are powered by the grid through the machine side converter (MSC) followed by a grid side converter (GSC). To supply power to multiple cranes in parallel, double-circuit lines are utilized. Failure of a single feeder causes voltage instability in the load bus. To analyze the voltage stability on the load bus, this article proposes a comprehensive model of the GSC while simplifying the MSC as constant power loads (CPL). When used to describe the CPL behavior of the connected IM load, the proposed modeling shows how input admittance behaves as a negative incremental, growing voltage instability on the load bus. This study uses Nyquist-based stability analyzes to address the voltage stability issue caused by a double-circuit line failure and a negative incremental input admittance. The feasibility of creating a phase-locked loop (PLL) for such grid disturbances is investigated. The possibility of installing a static VAR compensator (SVC) with a battery energy storage system (BESS) on the load bus is explored if there is no equilibrium point in the $P_{e}$ - $\delta$ curves during line failure.

    Original languageBritish English
    Pages (from-to)1484-1496
    Number of pages13
    JournalIEEE Transactions on Industry Applications
    Issue number1
    StatePublished - 1 Jan 2024


    • Constant power load
    • energy storage system
    • grid side converter
    • phase locked loop
    • static VAR compensator
    • voltage stability


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