Method of the identification of weak and/or strong nodes of...

Details Method of the identification of weak and/or strong nodes of... Method of the identification of weak and/or strong nodes of...

2005-06-07

2005-06-07

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S059000, C702S060000, C702S064000, C702S065000

Reexamination Certificate

active

06904372

ABSTRACT:
A method is disclosed for the identification of weak and/or strong nodes of an electric power transmission system. Electric parameters characterizing nodes and branches of an electric power transmission system are subject to computational treatment to obtain equations of power flow in all nodes of the system at assumed 100 percent system load value. Using earth as the reference point, nodal impedance values are computed for all nodes, and used to construct a P-Q curve which presents the functional relation between the system's reactive and active load. The nodal coefficient of voltage stability is determined as the relative distance between the base load point of that node and the critical point on the P-Q curve situated most closely to the base point. The coefficient is compared with a threshold value considered to be a safe margin to maintain voltage stability for a given node.

REFERENCES:
patent: 5745368 (1998-04-01), Ejebe et al.
patent: 5796628 (1998-08-01), Chiang et al.
patent: 1134867 (2001-09-01), None
Dehnel et al., “A method for identifying weak nodes in nonconvergent load flows”, May 1989, IEEE, IEEE Transactions on Power Systems, vol. 4, issue 2, pp. 801-807.
Yorino et al., “A method to approximate a closest loadability limit using multiple load flow solutions”, Feb. 1997, IEEE, IEEE Transactions on Power Systems, vol. 12, issue 1, pp. 424-429.
Chen et al., “Efficient methods for identifying weak nodes in electrical power networks”, May 1995, IEEE, IEEE Proceedings—Generation, Transmission and Distribution, vol. 142, issue 3, pp. 317-322.

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