The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 1989
Filed:
Aug. 26, 1988
Shizuka Nakamura, Kohbe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In the load flow calculating method of the present invention, a Jacobian matrix for reactive power with respect to voltage is made to coincide with a part of a Jacobian matrix for effective power with respect to phase by introducing variables of the quotients of differences between effective power and reactive power flowing through each node and specified values divided by the square of voltage on each node, whereby the need for triangular factorization of the Jacobian matrix for reactive power with respect to voltage is eliminated, and, at the time of calculating a voltage correction amount, the voltage correction amount is compensated by the use of the product of a Jacobian matrix for reactive power with respect to phase and a vector of phase correction amount, and by virtue of the needlessness of triangular factorization of the Jacobian matrix for reactive power with respect to voltage and nonnecessity, at the time of calculating the voltage correction amount, for calculating discrepancy of reactive power newly flowing in through each node from a specified value, and so forth, a speed-up of the load flow calculating process becomes possible.