Voltage control for electric power systems

Electricity: power supply or regulation systems – Input level responsive – Using a transformer or inductor as the final control device

Reexamination Certificate

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Details

C323S255000

Reexamination Certificate

active

07956596

ABSTRACT:
A limitation of the interaction between cascaded tap changers and/or between a tap changer and a shunt compensator independently of any real-time communication between the respective controllers is disclosed. Coordinated voltage control in distribution networks can be achieved by an adaptive updating or tuning of control parameters DB4, TD4of a voltage control unit controlling a second voltage control device, depending on instantaneous or actual operating conditions evaluated by the voltage control unit itself. Instead of using constant control parameters initially set by a commissioning engineer, the parameters are updated based on a voltage level UP4, which in turn is responsive to or affected by any control action performed by a first voltage control device neighboring the second voltage control device. The voltage control unit calculates a deviation of an instantaneous value of the voltage level from a reference value, and translates or maps this deviation to an update of its dead bands and/or time delay characteristics. Hence, the voltage control unit can anticipate, or determine a likelihood of, a control action of the first voltage control device, without the need for a real-time transmission of this information to the voltage control unit.

REFERENCES:
patent: 5272462 (1993-12-01), Teyssandier et al.
patent: 5646512 (1997-07-01), Beckwith
patent: 7069159 (2006-06-01), Zima et al.
patent: 2009/0079267 (2009-03-01), Korba et al.
patent: 1 923 765 (2008-05-01), None
patent: WO 96/23250 (1996-08-01), None
Form PCT/ISA/210 (International Search Report) dated Mar. 18, 2008.
Form PCT/ISA/237 (Written Opinion of the International Searching Authority) dated Mar. 18, 2008.
Form PCT/IPEA/409 (International Preliminary Report on Patentability) dated Feb. 6, 2009.
European Search Report dated May 18, 2007.
Mats Larsson, “Coordination of Cascaded Tap Changers Using a Fuzzy-Rule-Based Controller”,Fuzzy Sets and Systems, Feb. 16, 1999, vol. 102, No. 1, pp. 113-123, XP-004153045.
Yan-Jun Li et al., “Optimal Coordinated Voltage Control of Power Systems”,Journal of Zhejiang University Science A, An International Applied Physics & Engineering Journal, Feb. 1, 2006. vol. 7, No. 2, pp. 257-262, XP-019360963.
C. Taylor, “Power System Voltage Stability”, ISBN 0-07-063184-0, McGraw-Hill, 1994, Chapter 7.5, pp. 174-179.
Mats Larsson, “Coordination of Cascaded Tap Changers Using a Fuzzy-Rule Based Controller”,Dept. of Industrial Electrical Engineering and Automation, Lund Institute of Technology, Oct. 13, 2004, 25 pages.

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