P ∗(p.u.) Q ∗(p.u.) Table 1. The parameters of the simulated converters. 1 0 SBR Energy Balancing Off -1 0.28 0 -0.28 0 0.5 1 1.5 2 Time (ms) Grid Voltages (V) Grid Currents (A) dc Link Current (A) Lower Upper Branch Branch Currents (A) Currents (A) Simulation 2 Rated power (P ) 1 MW 1.5 MW Input voltage (Vdc ) 5 kV 5 kV Number of SMs per SBR (N) 5 5 SM rated voltage (VSM ) 1 kV 1 kV SM capacitance (C SM ) 0.83 mF 0.83 mF Number of SBRs per branch (M) 2 3 SBR inductance (L br) 5 mH 7.5 mH 2.5 FIG 11 The reference power profile used to test the dynamic operation of simulated converters. In all of the simulated cases, the normalization was performed with respect to the rated powers provided in Table 1. Lower SBR Upper SBR Voltages (V) Voltages (V) Simulation 1 ) SBR resistance (R br) 60 mX 60 mX PWM carrier frequency ( fc ) 999 Hz 999 Hz 2,400 vgA 0 vgB vgC -2,400 270 igA 0 igB igC -270 200 idc 100 0 -100 210 ipA ipB 0 ipC -130 210 inA inB 0 inC -140 1,100 990 890 1,100 1,000 910 0.5 1 1.5 2 2.5 3 Time (s) FIG 12 The operation of the converter utilizing two parallel SBRs within a branch. June 2020 z IEEE POWER ELECTRONICS MAGAZINE 59