Synchronous machine excitation control device for absorbing harm

Electricity: motive power systems – Positional servo systems – With stabilizing features

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318629, 318721, G05B 1101

Patent

active

058864938

ABSTRACT:
An excitation control device controls excitation of a synchronous machine so as to absorb the harmonic current of a specified order superposed onto the current flowing between an electric power system to the synchronous machine.
A harmonic detector selectively passes a harmonic component of the order of 6n.+-.1 in the detection signal detected by a current transformer. A pass signal of the harmonic detector is. 3-phase/2-phase converted by a rotating coordinate circuit into components on the orthogonal 2 axes on the rotating coordinate system rotating at an angular frequency of a fundamental current of the electric power system. At this time, the pass signal is calculated as a 6n-order harmonic current represented by the components on the normal two axes. The obtained 6n-order harmonic current is retrieved through a 6n-order harmonic filter, amplified by a power amplifier, and provided as an excitation current for the synchronous machine. Using the excitation current, a current having the same amplitude as, but opposite phase to, the harmonic current of the order of 6n.+-.1 flows as an armature current in the synchronous machine. Thus, the harmonic current of the specified order superposed onto the system current can be canceled.

REFERENCES:
patent: 4137489 (1979-01-01), Lipo
patent: 4736143 (1988-04-01), Nakamura et al.
patent: 5016157 (1991-05-01), Rozman et al.
patent: 5023924 (1991-06-01), Tajima et al.
patent: 5126641 (1992-06-01), Putman et al.
patent: 5274313 (1993-12-01), Amrhein
patent: 5334923 (1994-08-01), Lorenz et al.
patent: 5392607 (1995-02-01), Wu
patent: 5410228 (1995-04-01), Shibata et al.
patent: 5426720 (1995-06-01), Bozich et al.
patent: 5481172 (1996-01-01), Minowa et al.
patent: 5510689 (1996-04-01), Lipo et al.
patent: 5559421 (1996-09-01), Miyakawa
patent: 5594630 (1997-01-01), Baker
patent: 5636193 (1997-06-01), Ohmi

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