[특허]System of load flow calculation for electric power system

[미국특허] System of load flow calculation for electric power system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-003/18
출원번호	US-0237696 (1988-08-26)
발명자 / 주소	Nakamura Shizuka (Kohbe JPX)
출원인 / 주소	Mitsubishi Denki Kabushiki Kaisha (Tokyo JPX 03)
인용정보	피인용 횟수 : 24 인용 특허 : 0

초록 ▼

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.

대표청구항 ▼

A method of controlling a power system, comprising the steps of: obtaining on-line data of voltages and phases at nodes of main power buses of the power system, setting an initial control adjustment amount for one or more of the voltages and/or phases, calculating load flow at said nodes of the power system by a decoupled calculation employing a Jacobian matrix for reactive power with respect to voltage and a Jacobian matrix for effective power with respect to phase, and including triangular factorization of the Jacobian matrix for effective power to calculate discrepancy of effective power from specified values through such nodes, deriving triangular factorization of said Jacobian matrix for reactive power from the result of triangular factorization of said Jacobian matrix for effective power, said calculating including introducing variables representing quotients of the discrepancies of the effective power and the reactive power flowing in through each node from specified values divided by the square of the voltage on each node, and using such variables to calculate correction values of phase and voltage for said effective power and reactive power respectively from specified values through each node, by using the triangular factorization of said Jacobian matrices for effective and reactive power, evaluating the calculated load flow, correcting the control adjustment amount with said correction values and repeating the calculating and evaluating steps until the evaluating step indicates a good power system, and effecting a change in the voltages and phases at said nodes of the power system in accordance with the control adjustment amount after the evaluating step finds a good power system.

이 특허를 인용한 특허 (24) 인용/피인용 타임라인 분석

Nelson, William Christian Tracy; Berkowitz, Donald S.; Bik, Witold; Maloney, Michael A., Method and apparatus for automated reconfiguration of an electric power distribution system with enhanced protection.
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William Christian Tracy Nelson ; Donald S. Berkowitz ; Witold Bik ; Michael A. Maloney, Method and apparatus for automated reconfiguration of an electric power distribution system with enhanced protection.
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Huff,Frederick C.; Cheng,Xu; Francino,Peter N., Method and apparatus for determining actual reactive capability curves.
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Patel, Sureshchandra B., Method and apparatus for parallel loadflow computation for electrical power system.
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Huff,Frederick C.; Cheng,Xu; Francino,Peter N., Method and apparatus for providing economic analysis of power generation and distribution.
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Huff,Frederick C.; Cheng,Xu; Francino,Peter N., Method and apparatus for providing economic analysis of power generation and distribution.
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Nelson William Christian Tracy ; Partridge Daniel ; Berkowitz Donald S. ; Bik Witold ; Brasher Ed ; Tangney Barry, Method for automated reconfiguration of a distribution system using distributed control logic and communications.
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Nelson William Christian Tracy ; Partridge Daniel ; Berkowitz Donald S. ; Bik Witold ; Brasher Ed ; Tangney Barry, Method for automated reconfiguration of a distribution system using distributed control logic and communications.
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Nelson William Christian Tracy ; Partridge Daniel ; Berkowitz Donald S. ; Bik Witold ; Brasher Ed ; Tangney Barry, Method for automated reconfiguration of a distribution system using distributed control logic and communications.
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Schlueter Robert A. (Holt MI), Method for improving voltage stability security in a power transmission system.
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Schlueter Robert A. (Holt MI), Method for performing a voltage stability security assessment for a power transmission system.
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Patel, Sureshchandra B., Method of super super decoupled loadflow computation for electrical power system.
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Anderson, Larry W.; Bearden, Michael K.; Berthiaume, Guy H., Multi-level transformer and line loss compensator and method.
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Pomatto Lawrence A. (Santa Ana CA), Power distribution system control network.
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Pomatto Lawrence A. (Santa Ana CA), Power distribution system control network.
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Nagata Atsushi,JPX, Printer.
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Trias, Antonio, Sigma algebraic approximants as a diagnostic tool in power networks.
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Baone, Chaitanya Ashok; Premerlani, William James; Pan, Yan; Dai, Jing; Veda, Santosh Sambamoorthy; Tan, Zhenyu, System and method for modelling load in an electrical power network.
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Trias, Antonio, System and method for monitoring and managing electrical power transmission and distribution networks.
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Trias, Antonio, System and method for monitoring and managing electrical power transmission and distribution networks.
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Trias, Antonio, System and method for obtaining the powerflow in DC grids with constant power loads and devices with algebraic nonlinearities.
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Ekanayake, Sanji; Scipio, Alston Ilford; Davis, Dale J.; Kauffman, Eric J.; Yang, Timothy Tah-teh, System and method to minimize grid spinning reserve losses by pre-emptively sequencing power generation equipment to offset wind generation capacity based on geospatial regional wind conditions.
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Krok, Michael Joseph; Ren, Wei, Systems, methods, and apparatus for accelerating volt/VAR load flow optimization.
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Krok, Michael Joseph; Ren, Wei; Genc, Sahika, Systems, methods, and apparatus for integrated volt/VAR control in power distribution networks.
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[미국특허] System of load flow calculation for electric power system 원문보기

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