Abstract
With more and more environmental problems, renewable energy begins to play an increasingly large proportion. High-voltage direct current technology based on voltage source converter (VSC-HVDC) enables smooth access to renewable energy. Traditional DC grids system is generally radial connections, but In recent years, there are many parallel lines between the two converter stations in some meshed DC grids. However, the converter stations can't control the power flow of parallel lines completely, and some lines might cause too much loss even overload.According to the theory of circuit,there are four types of power flow control devices, variable resistors, DC transformers, CFC and series voltage sources have been proposed for the power flow control in a meshed DC grid .In this paper, their topology and operation properties were compared.
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