Modeling method of sequence admittance for three-phase voltage source converter under unbalanced grid condition

Journal of Modern Power Systems and Clean Energy - Tập 6 Số 3 - Trang 595-606 - 2018
CEN, Yang1, HUANG, Meng1, ZHA, Xiaoming1
1School of Electrical Engineering, Wuhan University, Wuhan, China

Tóm tắt

The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters (VSCs) especially in grid-connected mode. However, the sequence admittance is hard to calculate when the VSC is operating under unbalanced grid voltage conditions. In this paper, a simple and direct modeling method is proposed for a three-phase VSC taking the unbalanced grid voltage as a new variable for the system. Then coupling in the three-phase system can be calculated by applying the harmonic linearization method. The calculated admittance of three-phase VSCs is verified by detailed circuit simulations.

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