Bus voltage cooperative control strategy of AC/DC system based on VDCOL link and fuzzy controller

In order to suppress the transient overvoltage at the bus terminal of AC/DC system, a transient overvoltage coordination control strategy based on improved VDCOL curve and fuzzy control algorithm is proposed. According to the design principle of VDCOL control curve, an improved VDCOL curve based on Tanh function is proposed. Then fuzzy control algorithm is used to control the reactive power compensation device of LCC-HVDC system. Finally, a coordinated suppression strategy is used to suppress the transient overvoltage at the bus terminal. Through the actual network data verification, the results show that the coordinated suppression strategy has better suppression effect on transient voltage, which proves that the strategy has higher applicability.