Multi resonant Component-Based Grid-Voltage-Weighted Feedforward Scheme for Grid-Connected Inverter to Suppress the Injected Grid Current Harmonics Under Weak Grid

The grid voltage full feedforward scheme is an effective method to improve the injected grid current quality of the grid-connected inverter. However, due to the digital control delay, the suppression of the injected grid current harmonics is weakened, and the inverter output impedance has an additional negative phase shift, which deteriorates the system stability under weak grid. In this article, a multi resonant component-based...