Hysteretic Strategy of D-STATCOM Adapting to the Distribution Network with Fluctuant DG

To make D-STATCOM adapt to the distribution network with fluctuant distribution generators (DG), this paper studies the relationship between reactive power, DG and target voltage of D-STATCOM by establishing the model of the distribution network equipped with D-STATCOM, which also has fluctuation DG accessed. Then, based on the voltage adjustment coefficient, the reactive power-voltage hysteresis operation strategy of D-STATCOM is proposed and the switching condition between different operating modes is given. Finally, based on the random DG output data, the effectiveness of the proposed strategy is verified. The results show that the D-STATCOM hysteresis strategy can effectively reduce the variability of reactive power and voltage when the distribution network operating status changes randomly, in improving the reactive power margin of DSTATCOM, but also reduce network loss.