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The response of the DSTATCOM-BESS system with an unbalanced nonlinear load is as depicted in Figure 4.15. At 0.25 seconds, the three-phase load is transformed to two-phase, and at 0.3 seconds, one-phase and loads are disconnected at 0.35 seconds. The d component of currents is fixed at 35 A. The proposed BESS system supports load levelling and balancing during these loading conditions. The connected nonlinear load is again connected in the same sequence at 0.4, 0.45, and 0.5 seconds. It has been seen that the DSTATCOM provides a compensating current to maintain the source current and voltage sinusoidal and is balanced when keeping the terminal voltage at its calculated reference voltage. Moreover, the source current harmonics and load current harmonics are illustrated in Figures 4.16 and 4.17 and are visualized at 0.19% and 30.31%, respectively, which shows the proposed system’s superiority.

Figure 4.15 Response of DSTATCOM-BESS under an unbalanced nonlinear load.

Figure 4.16 Source side frequency spectrum.

Figure 4.17 Load side frequency spectrum.