Coordinated Control for Balanced Current and Constant Power of Grid-Connected Inverters Under Distorted Voltage Conditions

To address the issues of output current distortion and power fluctuations in grid-connected inverters (GCI) under harmonic grid conditions, this study proposes a coordinated control strategy based on the delayed signal cancellation (DSC) theory, which eliminates the need for phase-locked loops and asymmetric positive-negative sequence component calculations. The strategy ensures both current balance and power stability in grid-connected inverters. First, the impact of harmonic voltage on current and power is analyzed. Subsequently, the DSC method is employed to extract harmonics from the reference current, and a regulation coefficient is introduced to control their magnitude, thereby achieving coordinated control of constant output power and balanced current in the grid-connected inverter. Finally, simulation results validate the effectiveness of the proposed control strategy.