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EP0308621A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power system stabilizer

Assignee: Mitsubishi Electric Corp
•
Filing: 1988-07-27
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Granted: —
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Expires: 2008-07-27
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Abstract

Abstract A power system stabilizer (PSS) to bring the constant in a phase lead-lag circuit of the PSS to an optimum value by having such procedures carried out in its phase lead-lag compensation circuit as to apply the rule to lead the phase of the PSS when the period of the power fluctuation in each mode tends to decrease and to lag the phase of the PSS when conversely the period tends to increase by means of a fuzzy inference device to detected results of the periods weighted by the degrees of the tendency, to superpose the outputs obtained by application of the rule to obtain the center of gravity, and therewith finally to vary the constant in the amplification and phase lead-lag circuit of the PSS.

Inventors

  • 👤 Seiichi Mitsubishi Denki K.K. Tanaka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 02:02
CPC Classifications
G; G05; G05B; G05B5/00; G05B5/01; H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 121 words
In a power system stabilizer (hereinafter to be referred to as PSS) detecting one of such quantities as motor output, number of revolutions of the motor, and frequency of the system, and passing the detected quantity through gain and phase compensation circuits, and, based upon the output, adjusting the excitation quantity for a synchronous motor by means of an automatic voltage regulator thereby to achieve stabilization of a power system, said power system stabilizer comprising a plurality of period detectors for detecting periods of power swing and phase lead-lag compensation circuit compensating for the phase of the PSS based upon the detected periods, wherein the phase of the PSS is adapted to be compensated for dependent upon variations in the period.
Claim 2
Dependent Claim 121 words
In a power system stabilizer (hereinafter to be referred to as PSS) detecting one of such quantities as motor output, number of revolutions of the motor, and frequency of the system, and passing the detected quantity through gain and phase compensation circuits, and, based upon the output, adjusting the excitation quantity for a synchronous motor by means of an automatic voltage regulator thereby to achieve stabilization of a power system, said power system stabilizer comprising a plurality of period detectors for detecting periods of power swing and phase lead-lag compensation circuit compensating for the phase of the PSS based upon the detected periods, wherein the phase of the PSS is adapted to be compensated for dependent upon variations in the period.
Claim 3
Dependent Claim 24 words
A power system stabilizer according to claim 1, wherein said phase lead-lag compensation circuit includes a fuzzy inference device with fuzzy inference applied thereto.

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