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AssigneesHitachi, Ltd., Hitachi Engineering Co., Ltd.
InventorsHiroaki Aotsu, Akira Isono, Masuo Goto, Koichi Kimura, Yasushi Momochi, Takaaki Kai, Satoshi Kitamura, Akihisa Kaihara, Hirosi Okada
Estimating the term…
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.
An excitation control apparatus for a generator having a terminal voltage regulating means for regulating a field current of the generator in accordance with a differential signal between a terminal voltage signal of the generator and a reference voltage signal, comprising:
An excitation control apparatus for a generator having at least one auxiliary compensation/control function for the operation of the generator added to a terminal voltage regulating function for regulating a field current of the generator in accordance with a differential signal between a terminal voltage signal of the generator and a reference voltage signal, comprising:
A regulator system for an alternating circuit generator having a field excitation winding and output terminals connected to an electrical system comprising:
An excitation control apparatus for a generator having a terminal voltage regulating means for regulating a field current of the generator in accordance with a differential signal between a voltage signal from a terminal voltage of the generator connected in parallel with at least one other generator and a reference voltage, said voltage signal being compensated by a cross-current between the generators and an impedance, said control apparatus including at least one of means producing a control signal for limiting and under-excitation of the generator, means producing a control signal for limiting and over-excitation of the generator, means producing a control signal for maintaining a constant power factor operation of the generator, and means for producing a control signal for suppressing an over current of an armature winding of the generator, at least one of said signal producing means being responsive to active and reactive power signals of the generator for scalar-operating the magnitude of the control signal produced thereby, said control signal being added to the output of said voltage regulating means.
An excitation control apparatus for a generator having a terminal voltage regulating means for regulating a field current of the generator in accordance with a differential signal from a voltage signal from a terminal voltage of the generator connected in parallel with at least one other generator and a reference voltage, said control apparatus including at least one of means producing a control signal for limiting an under-excitation of the generator, means producing a control signal for limiting an over-excitation of the generator, means producing a control signal for maintaining a constant power factor operation of the generator, and additional means for producing a control signal for compensating for a cross-current between the generators connected in parallel, at least one of said signal producing means being responsive to active and reactive power signals of the generator for scalar-operating the magnitude of the control signal, said additional signal producing means being responsive to the reactive power signals of the generators connected in parallel, the control signals of said signal producing means and additional signal producing means being added to the output of said voltage regulating means.
Dependencies are inferred from the claim text.