Voltage or reactive power control method and control device ther

Details Voltage or reactive power control method and control device ther Voltage or reactive power control method and control device ther

1992-01-17

1994-07-05

Black, Thomas G.

Boots, shoes, and leggings

364492, 364495, 395900, 395907, 395915, G05F 120

Patent

active

053273559

ABSTRACT:
In order to control a voltage using e.g. a tap transformer, the difference .DELTA.V between the actual voltage and a reference voltage is obtained and integrated over time. That integral is then modified by at least one parameter generated by fuzzy logic from control conditions of the voltage. In this way the fuzzy logic may find the optimum control strategy which keeps the actual voltage closest to the reference voltage without an excessive number of tap position changes. The reference voltage may vary with time, and therefore the control of the voltage with time may be evaluated, and the control conditions varied accordingly, e.g. by fuzzy logic, so that the control arrangement can exhibit learning. Normally, the integral is modified such that

REFERENCES:
patent: 4623834 (1986-11-01), Klingbiel et al.
patent: 4748341 (1988-05-01), Gupta
patent: 5019979 (1991-05-01), Takahashi
patent: 5119012 (1992-06-01), Okamura
patent: 5136233 (1992-08-01), Klinkenberg et al.
Satoshi Matsuda et al. IEEE Trans. on Indust. Electronics and Control Instrumentation "Power System Voltage Control by Distributed Expert Systems" vol. 37, No. 3 pp. 236-240 Jun. 1990.
D. Chui et al., Power System Control Convention 24, "Power System Control Using Fuzzy Reasons" Aug. 1990.

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