A Simple Method to Determine Synchronous Machine Quantities Using Frequency Characteristics of Operational Impedances |
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| Authors: | AKIRA TANAKA SHU YAMAMOTO TAKAHIRO ARA KAZUTO SAKAI SHUJI KOMURO |
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| Affiliation: | 1. Course of Electricity, Electronics and Communications, Graduate School of Science and Engineering, Kujirai, Kawagoe, Japan;2. Polytechnic University 2‐32‐1, Ogawanishi‐machi, Kodaira, Japan;3. Kanto Polytechnic College 612‐1, Mitake, Yokokura, Oyama, Japan |
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| Abstract: | 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). |
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| Keywords: | synchronous machine quantities operational impedance frequency characteristics dc test |
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