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Operational capability of generator-HVDC convertor units

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4 Author(s)
Arrillaga, J. ; Dept. of Electr. & Electron. Eng., Canterbury Univ., Christchurch, New Zealand ; Sankar, S. ; Watson, N.R. ; Arnold, C.P.

The authors demonstrated the limitations of the formulation based on the concepts of commutating voltage and commutating reactance when applied to unit connected generators-HVDC convertors. In general each individual application requires extensive dynamic analysis to determine the harmonic ratings and the external characteristics of the unit connection scheme in periodical steady state. Such information is derived for a typical test case with the aid of a state variable solution. The results show, as expected, a reduction in harmonic current levels caused by the increased commutation overlaps. However, the generator harmonic voltages in the presence of rotor saliency are considerably higher. while the unit connection can be designed to provide any specified nominal power, the absence of filters limits the operation capability at larger current levels and thus reduces the ability of the HVDC link to provide temporary power increases

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Power Delivery, IEEE Transactions on  (Volume:6 ,  Issue: 3 )