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The nodal image
Characterization of structures and operating conditions by nodal images
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abscissa axis active and reactive active current admittances angle aspect asymmetric faults boundary nodes busbars central node chapter characteristics co-linear coefficients considered constant corresponding deduced denoted dependent variable deterioration determine diagram dQ/dU effect electric networks established evolution external network fault fictitious node figurative concepts final equivalent geometry homothety impedance indicators initial network interconnection lines introduced linear branches load nodes load short-circuit current loss formula machines magnitudes matrix equation method network extended nodal analysis nodal image node currents node under consideration node voltage non-linear branches operating conditions power plants power systems reactive power real network reduced model reduced scheme reference REI graph REI models REI nets representation rotors shown in Figure simple simplified single single-load equivalent single-load node single-load REI equivalent static stability sub-networks synchronous condenser tion total power transformation transient reactances transient stability values variant forms variation laws vector chain visualization voltage regulation