Parallel Operation Control of D-STATCOM based on Load Current Detection

This paper proposed a repetitive learning control strategy based on abc three phase static coordinate with distribution-static synchronous compensator (D-STATCOM). D-STATCOM adopts self-exciting start-up mode i, with low impulse current and good dynamic performance. In the low voltage and high current occasion, the D-STATCOMs parallel operating adopts only one centralized controller in this paper. PQ operation method is using to realize reactive current detection. The voltage outer loop adopts average voltage PI control to achieve DC voltage stability, and the current inner loop adopts repetitive learning control to ensure current tracking accuracy. Finally, the two D-STATCOMs parallel operating model is set up on the platform of PSCAD/EMTDC, the simulation results show that the proposed control strategy is feasible and efficient.