MUMBAI, India, Sept. 28 -- Intellectual Property India has published a patent application (202631112297 A) filed by Indian Institute Of Technology Indian School Of Mines, Dhanbad on September 18, 2026, for System And Method For Impedance-Based Stability Analysis Of A Multi-Source Multi-Converter Dc Microgrid Using Bode-Nyquist Mapping.
Inventors include Khalid Raza Khan; and Dr. Kartick Chandra Jana.
The application for the patent was published on September 25, 2026, under issue no. 39/2026.
Abstract: A stability analysis system for a multi-source multi-converter DC microgrid (DCMG) comprises an impedance modelling unit deriving closed-loop source and load impedances (Zs, ZL) of subsystems separated at a DC bus and a minor loop gain as the ratio thereof; a pole determination unit determining a number (P) of open-loop right-half-plane poles thereof; a frequency response unit generating Bode magnitude and phase responses of both impedances; a forbidden region identification unit identifying forbidden regions (FR), bounded by crossing points (CP1, CP2), wherein |Zs| exceeds |ZL|; a phase difference evaluation unit determining, from the phase- difference amplitudes at those crossing points alone, whether a 180-degree phase crossing exists therein, without a crossing boundary or the Nyquist contour; a crossing classification unit classifying each crossing as clockwise (CC) or anti-clockwise (ACC); and a stability determination unit declaring the DCMG stable when a Nyquist encirclement number (N) equals -P.
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