Hitachi, Ltd.

Hitachi Engineering Co., Ltd.

Satoshi Kitamura

Koichi Kimura

Hiroaki Aotsu

Akihisa Kaihara

Masuo Goto

Akira Isono

Yasushi Momochi

Takaaki Kai

Hirosi Okada

Yoichi Kato

A synchronous machine regulator is provided to simplify an adjustment work of current distribution to thyristors, the synchronous machine regulator having a circuit boardmounting a gate drive circuitfor supplying a gate pulse to each of thyristor bridges constituting a plurality of thyristor rectifiersconnected in parallel and supplying excitation current to a field windingof a synchronous machineand phase control meansfor controlling a phase angle of each gate pulse to be supplied to each thyristor, wherein the current distribution to thyristors is controlled by the phase control means

Excitation system for synchronous machine

A field control apparatus for a generator having a field winding comprises a terminal voltage control unit for controlling a field current of the generator in accordance with a difference between a terminal voltage signal of the generator and a reference voltage signal, which control unit has at least one of a line drop compensation function, an under-excitation limitation function, an over-excitation limitation function, a power factor regulation function, an armature winding over-current compensation function and a cross-current compensation function. The field control apparatus includes a detector as a common signal source for detecting active power and reactive power components at an output terminal of the generator and means responsive to the output of the detector for performing scalar operation in accordance with a function of the added compensation/control function described above. An output of the operating means is added to the differential signal as an added function signal to control the field current for excitation of the field winding.

Excitation control apparatus for a generator

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Hitachi, Japan

Satoshi Kitamura