Abstract: The single-loop weighted average current (WAC) control is attractive for the LCL-type grid-connected inverter owing to its inherent active damping. High robustness can be naturally harvested without any additional damping, but it requires two current sensors. Depending on the different weight values, a family of the splitting current single-loop control schemes with the associated filter configurations was developed in this paper, where only one current sensor is needed. Furthermore, considering the potential damping of the point of common coupling (PCC) voltage feedforward, a unified model of these splitting current single-loop control schemes was established, and the overall active damping performance was evaluated, paving a way for the robust design. To tolerate the grid impedance variation, the robust range of the weight value was depicted, which helps select the proper correlative splitting current single-loop control scheme. Experimental results are in well agreement with the theoretical expectations, and confirm that high robustness, high-quality grid current and cost-efficiency can be concurrently achieved.