Abstract
Abstract In order to suppress the transient overvoltage at the bus bar of the transmission terminal of the AC-DC system, a transient overvoltage suppression strategy based on an improved VDCOL curve is proposed. Firstly, the expression of transient overvoltage is derived based on the DC short-circuit ratio, and then an evaluation index of transient overvoltage is proposed according to the standard of overvoltage. Then, according to the control curve design principle of VDCOL, an improved VDCOL curve based on the Tanh function is proposed. Finally, this suppression strategy is used to suppress the transient overvoltage at the bus terminal. Through the actual network data verification, the results show that the improved VDCOL curve has a better suppression effect on transient voltage than the traditional control curve, which proves that the strategy has higher applicability.
Published Version
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