基于托里拆利点的柔性互联装置直流电压波动抑制策略OACSTPCD

Considering that the problem of voltage fluctuations on the DC side caused by the three-phase imbalance of the AC grid of the flexible interconnection device,a DC voltage fluctuation suppression strategy for flexible interconnection device based on the Torricelli point was proposed.Firstly,by defining the Torricelli point of the triangle formed by the voltage vector in the three-phase unbalanced fault system as the"new neutral point",the voltage amplitude asymmetry and phase angle drift faults in the traditional three-phase coordinate system were transformed into voltage amplitude faults in the Torricelli point coordinate system;secondly,the relationship between the active power oscillation of the three-phase power system and DC fluctuations was analyzed,a new control strategy was established to suppress the voltage fluctuations of the DC bus voltage by suppressing the fluctuation of double frequency component of active power effectively.Finally,the proposed method was proved to be effective by the Matlab/Simulink simulation model.