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  • 1975-1979  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 57 (1976), S. 345-354 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Es wird ein System von parallelen Rechnern vorgeschlagen, mit dem “on-line” Berechnungen in einem Verteilernetz (um eine Größenordnung) beschleunigt werden können. In der Einführung werden ein solches System und seine Arbeitsweise beschrieben, mehrere Vorteile angegeben und das Lastflußproblem definiert. Im zweiten Abschnitt wird eine neue iterative Lösungsmethode entwickelt, die sich sowohl für serielle wie auch parallele Bearbeitung eignet. Ihre Vorteile und Simulationsergebnisse werden angegeben. Im dritten Abschnitt werden die verschiedenen Faktorisierungsmethoden zur direkten Lösung der Lastflußprobleme auf neue Algorithmen erweitert, dann in zwei Gruppen eingeteilt, parallelisiert und simuliert.
    Notes: Contents It is suggested that in order to speed up the solution for on-line dispatching by an order of magnitude, a parallel-computer system should be employed. The introduction describes such a system and its mode of operation, shows its many advantages and defines the load-flow problem to be solved on it. The second section develops a new algorithm for iterative solution which may be used both sequentially and in parallel. Its advantages and simulation results are also given. The third section extends the number of direct (factorization) methods, unifies them into two groups, adapts them for parallelism and shows some results.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 61 (1979), S. 1-6 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Eine neue Methode der Lösung von nichtlinearen algebraischen Gleichungen wird beschrieben. Sie kann als eine Näherung zur bekannten Methode von Newton-Raphson angeschen werden, die mit einer einmaligen Inversion der Jacobi-Matrix bei linearer Konvergenz auskommt. Angewendet auf das Lastflußproblem wo man Blöcke von 2×2-Matrizen benützt, ergeben sich zusätzliche Vorteile. Operationen an Blöcken und die Konvergenz der neuen Methode werden diskutiert. Resultate zeigen, daß die neue Methode der Lösung des Lastflußproblemes vorteilhaft ist.
    Notes: Contents A new method for solving nonlinear algebraic equations is introduced. It may be considered an approximation to the well-known method of Newton-Raphson and attains linear convergence with a single inversion of the Jacobian matrix. If applied to the particular case of load-flow, it may lead to computational savings when operations on blocks (2×2 matrices) are used. Efficient operations on blocks and the convergence of the new method are discussed. Numerical results support the claim that the algorithm is indeed useful.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 59 (1977), S. 61-68 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht In Aufsatz [1] wurden ein Modell eines parallelen Rechner-systems (PAPROS) und zugehörige Algorithmen zur Lösung des Lastflußproblems vorgeschlagen. In Abschnitt 2 wird ein Bewertungsfaktord definiert, um den Vorteil von PAPROS gegenüber den üblichen “Mono-Computern” angeben zu können. Dieser Faktor wird für verschiedene Algorithmen berechnet. Bei der Diskussion der dabei erhaltenen Ergebnisse zeigt sich, daß die parallele Ausführung der Gauss-Jordan-Methode einer direkten Elimination vorzuziehen ist. Die Begründung für dieses unerwartete Ergebnis wird gegeben. In Abschnitt 3 werden zwei neue, direkte Methoden diskutiert: “Block-Elimination” und ein Algorithmus nach Danilewski. Der erste erweist sich bei einer parallelen Ausführung als anderen Methoden überlegen. In Abschnitt 4 wird eine all-gemeine Methode zur Beschleunigung der direkten Lösungen beschrieben. Die Arbeit schließt mit einer Zusammenstellung der Ergebnisse.
    Notes: Contents In a recent paper [1], a model of a parallel processing system (PAPROS) was described and associated algorithms for solving the load flow problem were developed. In order to evaluate gains brought about by using PAPROS instead of a standard mono-computer, an “overhead” factord will be defined and computed in Section 2. This computation shows that for parallel execution the Gauss- Jordan method is preferable to straightforward elimination and the reasons for this unexpected result are explained. In Section 3, two new factorization methods, the “block-elimination” and Danilewski algorithms, are discussed. The first is superior to known methods, if executed on PAPROS. In Section 4 a general method to speed up the solution of direct methods is developed. In conclusion (Section 5) the contributions of the paper are listed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 27 (1976), S. 371-372 
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 32 (1979), S. 105-108 
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65F10 ; CR: 5.14
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary A generalization of alternating methods for sets of linear equations is described and the number of operations calculated. It is shown that the lowest number of arithmetic operations is achieved in the SSOR algorithm.
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  • 6
    Publication Date: 1976-11-01
    Print ISSN: 0948-7921
    Electronic ISSN: 1432-0487
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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  • 7
    Publication Date: 1977-01-01
    Print ISSN: 0948-7921
    Electronic ISSN: 1432-0487
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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  • 8
    Publication Date: 1979-01-01
    Print ISSN: 0948-7921
    Electronic ISSN: 1432-0487
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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  • 9
    Publication Date: 1976-12-01
    Print ISSN: 0029-599X
    Electronic ISSN: 0945-3245
    Topics: Mathematics
    Published by Springer
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  • 10
    Publication Date: 1979-03-01
    Print ISSN: 0029-599X
    Electronic ISSN: 0945-3245
    Topics: Mathematics
    Published by Springer
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