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A Simple Method to Determine Synchronous Machine Quantities Using Frequency Characteristics of Operational Impedances
Author(s) -
TANAKA AKIRA,
YAMAMOTO SHU,
ARA TAKAHIRO,
SAKAI KAZUTO,
KOMURO SHUJI
Publication year - 2017
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22983
Subject(s) - reactance , transient (computer programming) , electrical impedance , control theory (sociology) , power (physics) , engineering , time constant , synchronous motor , simple (philosophy) , voltage , electronic engineering , electrical engineering , computer science , physics , philosophy , control (management) , epistemology , quantum mechanics , artificial intelligence , operating system
SUMMARY This paper presents a simple method for determining synchronous machine quantities: d‐ and q‐axes time constants and reactances. This method determines them only by drawing additional lines in the frequency characteristics of operational impedances. A new systematic drawing strategy for determining transient/subtransient open‐circuit time constants and the d‐axis transient reactance is proposed. The frequency characteristics of operational impedances are obtained by the standstill dc test using a small dc power supply. Since the rotational test becomes unnecessary, the proposed method is suitable for tests in a factory. The validity of the proposed method was demonstrated with a numerical calculation example on a large‐capacity machine (800 MVA, 25 kV, two poles, 60 Hz) and an implementation test on a small‐capacity machine (10 kVA, 200 V, 31.9 A, four poles, 50 Hz).