Equivalent Circuit Constants of Synchronous Machine Using Frequency Characteristics of Operational Impedances and Application to Brushless-Excited Machine

Tanaka Akira, Yamamoto Shu, Ara Takahiro, Sakai Kazuto, Komuro Shuji

doi:10.1541/ieejias.137.256

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Other Title

演算子インピーダンスの周波数特性を利用した同期機の等価回路定数算出法とブラシレス機への適用
エンザンシインピーダンスノシュウハスウトクセイオリヨウシタドウキキノトウカカイロテイスウサンシュツホウトブラシレスキエノテキヨウ

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Description

This study proposes a method for determining the equivalent circuit constants of synchronous machines. First, a new approach to calculate the equivalent circuit constants considering mutual leakage reactance between field and damper windings is proposed. This method can determine the constants by substituting synchronous machine constants (time constants and reactances) in simple formulae. As these machine constants are easily obtained from the frequency characteristics of the d-axis and q-axis operational impedances measured through the standstill DC test, determining the equivalent circuit constants is considerably simplified. Second, an improved DC test that can measure the operational impedances of a synchronous machine with a brushless excitation system is proposed. This method allows for performing the DC test without separating the diode rectifier circuit from the field winding of a rotor. As a practical example, the proposed method is implemented on a 10-kW salient-pole synchronous generator with an external diode bridge rectifier connected to field winding terminals. Using the determined equivalent circuit constants, the field and armature transient currents at a sudden three-phase short circuit are simulated. By comparing the simulation results with measurement test data, the validity of the proposed method is verified.

Journal

IEEJ Transactions on Industry Applications

IEEJ Transactions on Industry Applications 137 (3), 256-266, 2017

The Institute of Electrical Engineers of Japan

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