Initially, the system is stable. As the active power of inverter 2 increases, the system transitions from stability to instability. Decreasing the active power of inverter 1 restores stability to the system.
According to Fig. 3, it can be recognized that the grid-connected inverter system demonstrates small-signal stability for the operating conditions situated behind the red border. Moreover, the corresponding maximum real part is significantly negative, indicating that the system has a large stability margin.
As the active power of inverter 2 increases, the system transitions from stability to instability. Decreasing the active power of inverter 1 restores stability to the system. These variations in system stability are consistent with Fig. 15, confirming the applicability of the proposed algorithm to the grid-connected multi-inverter system. Fig. 14.
When the grid-connected inverter system is in steady state, the control system d q -frame is aligned with the grid system d q -frame.
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