The grid-connected photovoltaic inverter is the interface between photovoltaic energy sources and the grid, and it plays a key role in controlling the quality of grid at the point of common coupling. The current control methods of the PV grid-connected inverter is numerous, and there are a variety of current regulators, but there is a big difference between the regulators in control structure, realization method and effect of control. The PV grid-connected inverters are overviewed in the view of the current linear regulator. The main linear current regulators: proportional-integral, proportion resonance and deadbeat regulators are compared and evaluated in terms of advantage and disadvantage of algorithm, complexity of realization, real-time performance, steady-state error, etc. Some possible future research fields of the linear current regulator are discussed.

grid-connected photovoltaic inverter  /  control strategy  /  direct current control  /  linear regulator