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

• Published in: IEEE transactions on industry applications 2024-01, Vol.60 (1), p.1484-1496
• Main Authors: Muduli, Utkal Ranjan, Moursi, Mohamed Shawky El, Nikolakakos, Iraklis P., Hosani, Khalifa Al, Mohammad, Sayed Abdelaziz, Ghaoud, Tareg
• Format: Article
• Language: English
• Subjects: Circuits; Compensators; Constant power load; Cranes; Double circuit; Electrical impedance; Energy storage; energy storage system; Failure; grid side converter; Impedance; Induction motors; Load modeling; Modelling; phase locked loop; Phase locked loops; Power system stability; Stability analysis; Stability criteria; static VAR compensator; Tractors; Transient analysis; Voltage control; Voltage stability
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2023.3321031

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.