Open AccessStructure preserving energy function including the synchronous generator magnetic saturation and sub‐transient models
Author(s) -
Younis Mohamed Ramadan,
Iravani Reza
Publication year - 2017
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2016.2005
Subject(s) - transient (computer programming) , saturation (graph theory) , permanent magnet synchronous generator , generator (circuit theory) , control theory (sociology) , transient analysis , energy (signal processing) , computer science , physics , transient response , mathematics , engineering , electrical engineering , voltage , power (physics) , thermodynamics , artificial intelligence , control (management) , operating system , combinatorics , quantum mechanics
This study presents, develops and evaluates a structure preserving energy function based on the sixth‐order generator model which is formulated with respect to the centre‐of‐inertia. Flux saturation and leakage flux effects are also included in the model. Each load is represented as voltage‐dependent load. It is demonstrated that the proposed energy function satisfies the energy function required conditions. This study also derives a modified energy function from the original development which provides a simpler representation with less computational need while preserving the same accuracy. Physical interpretation of each term of the modified energy function is also discussed. To evaluate and verify the accuracy of the modified energy function, the critical clearing time using potential energy boundary surface method and the time‐domain simulation results of a test system are presented. The calculation of the critical energy based on the proposed energy function differs by at least 10% (more accurate) compared with the existing energy functions.