This paper presents a dual-loop control scheme in coordinates for paralleled three-phase four-leg voltage source inverters. Using --coordinate, output voltages of the inverter can be controlled in each channel ( ) independently as the voltage component in relating to the inductor in the fourth leg only exists in o-channel. The use of interleaving for paralleled three-phase four-leg inverter would contribute to harmonic cancellation. For control loop, a proportional-resonant regulator in the outer loop and a proportional regulator in the inner loop are incorporated. Meanwhile a state observer for estimating the output voltage and inductor current in each channel is introduced to compensate one time-step delay of the system. The performance of proposed control scheme is verified by experimental results.Index Terms--Four-leg inverter, proportional-resonant regulator, interleaving method, state observer
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