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Analysis. Simulation, and Implementation of Zero Output Impedance for Single-phase Inverter

To demonstrate an ideal inverter, zero output impedance for single-phase inverters is proposed based on the state space model. The proposed controller consists of four parallel parts: a reference output voltage compensation part, a direct load current feed-forward compensation part, a capacitor current controller and an output voltage controller. Zero tracking error of the inverter can be achieved by the reference output voltage compensation. Furthermore, zero output impedance can be realized by matching filter parameters to their actual values. Moreover, for linear or nonlinear loads, a fast dynamic response can be achieved using the inner current controller, and a good steady-state performance can be obtained because of the outer voltage controller. Finally, simulation and experimental results show that the proposed control scheme has a fast dynamic response, zero steady-state error and strong robustness.