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http://dx.doi.org/10.5370/JEET.2015.10.5.1958

A New Definition of Short-circuit Ratio for Multi-converter HVDC Systems  

Liu, Dengfeng (State Key Laboratory of Advanced Electro-magnetic Engineering and Technology, Huazhong University of Science and Technology)
Shi, Dongyuan (State Key Laboratory of Advanced Electro-magnetic Engineering and Technology, Huazhong University of Science and Technology)
Li, Yinhong (State Key Laboratory of Advanced Electro-magnetic Engineering and Technology, Huazhong University of Science and Technology)
Publication Information
Journal of Electrical Engineering and Technology / v.10, no.5, 2015 , pp. 1958-1968 More about this Journal
Abstract
In this paper, a new definition of short-circuit ratio concept for multi-converter HVDC systems is proposed. Analysis results of voltage interaction between converters show that the reactive power-voltage characteristic of a converter has a dominant effect on voltage interaction level compared with its active power-voltage characteristic. Such a relation between converter reactive power and voltage interaction level supports taking the former into account in the definition of short-circuit ratio concept for multi-converter systems. The proposed definition is verified by the method of maximum power curve for various system configurations. Furthermore, a formula to calculate transient overvoltage for multi-converter systems is derived based on the proposed definition, and the efficiency of the derived formula is verified.
Keywords
High voltage direct current; Multi-converter system; Short-circuit ratio; Multi infeed interaction factor; Converter reactive power-voltage characteristic; Transient overvoltage;
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