Effect of a modulated HVDC link on power system transients
Teshome, Asrat
Teshome, Asrat
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1992
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This paper presents the details of a digital computer study of the effects of transient interactions, during large system disturbances, between an AC system and an associated high voltage DC transmission line with the rapid change in power transfer capability (modulated HVDC). The combined system consists of a large turboalternator synchronized to an infinite bus through two long-distance high voltage AC lines in parallel with an equally long controlled HVDC link. In the analysis, a rigorous nonlinear mathematical model, based on Park's equations, is formed by transforming the machine variables and the AC and DC transmission line parameters to a rotating reference frame attached to the alternator rotor, thereby providing the detailed transient behavior of the interconnected AC/DC system. Results of the studies demonstrate that a modulated HVDC link can provide significant increases in the loadability of AC lines by reducing or eliminating the constraints imposed by transient stability limitations. It appears, however, that, for certain systems, adverse stability behavior may result if the modulation setting exceeds 50%. Possible effects of HVDC modulation on the incidence of turboalternator torsional interactions are also considered. These interactions, however, are dependent upon parameters such as AC transmission, configuration, and the control mode characteristics of the HVDC terminals. © 1992.
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Elsevier BV
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Electric Power Systems Research
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0378-7796