A Complex-Based High Bandwidth Current Control Design for LCL Grid-Connected Inverter

In modern electrical power systems, inverters play a crucial role of energy conversion and power control. Meanwhile, inverter control also plays a key role in the hierarchical structure control of power grid. In this paper, a dominant pole elimination current control technique is proposed, which is suitable for grid-following inverter. The dominant pole with slow dynamic is eliminated by the basic zero-pole cancellation principle, and the load the load disturbance-rejection performance is improved. For double-loop control structures with power control outer loop and current control inner loop, due to the elimination of the dominant pole, the corresponding rapidity of the current control inner loop achieves an approximate unit gain from the reference point to the output, greatly improving the performance of the power control outer loop. In addition, the difficulty of parameter design is simplified by using complex coefficients. The effectiveness and superiority of the proposed method are verified by simulation.