An analytical method is demonstrated which allows the level of negative phase sequence (NPS) voltage at a busbar to be expressed as a sum of phasors representing independent sources. The method is extended to enable the balancing capability of Static Var Compensators (SVCs) with individual phase voltage control to be assessed. The capability of such SVCs and the allowable levels of NPS voltage on the system, including any short term limits, can be combined in a capability chart showing the unbalanced loads which can be supplied from a substation. The approach facilitates the treatment of fixed unbalances due to filters or intentional offsets designed to maximise the SVC balancing range for specific loads. Field tests results are presented which validate the analyitcal methods used.


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    Title :

    Using phasors to analyze power system negative phase sequence voltages caused by unbalanced loads


    Additional title:

    Anwendung von Vektoren zur Analyse von durch unsmymmetrische Belastung hervorgerufenen gegenläufigen Spannungen in Energienetzen


    Contributors:
    Ledwich, G. (author) / George, T.A. (author)

    Published in:

    Publication date :

    1994


    Size :

    7 Seiten, 11 Bilder, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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