Several control methods have been proposed for inverter stability enhancement by adding passive components or extra converters , , , . Industrial applications commonly add the passive components to realize passive damping .
For example, changes in grid impedance and the inverter output power are prone to stability problems . Thus, it is imperative to enhance the ability of the grid-connected inverter in weak grids. Several control methods have been proposed for inverter stability enhancement by adding passive components or extra converters , , , .
They can be realized by the narrowband digital filtering technique , compensator added in feedforward voltages and currents , , , , and the power controller with a high pass filter . The results show that the phase response of the inverter impedance has a phase lead (phase boost).
Fig. 21 exhibits the grid voltage and current waveforms of the inverter-grid system under different output powers using FCIN, FCOUT, and the proposed methods. The output power is changed from 0.6 pu to 0.8 pu at t = 0.4 s.
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