Electrical transmission or interconnection systems – Plural load circuit systems – Plural sources of supply
Patent
1988-08-26
1989-09-19
Beha, Jr., William H.
Electrical transmission or interconnection systems
Plural load circuit systems
Plural sources of supply
307 24, 307 33, 323205, 364492, H02J 318
Patent
active
048684104
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.
REFERENCES:
Despotovic, "A New Decoupled Load Flow Method", IEEE Transactions on Power App. and Syst., vol. 93, No. 3, pp. 859-869 (1974).
Stott et al., Fast Decoupled Load Flow, IEEE, PAS-93, No. 3, pp. 859-867, 1973.
Beha Jr. William H.
Mitsubishi Denki & Kabushiki Kaisha
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