Study on Grid Control Methods Based on Three-Phase Current Source Type 5-Level Converters

Against the backdrop of global energy transition and climate change, enhancing the grid integration efficiency and quality of renewable energy sources is pivotal for achieving sustainable development goals. This paper introduces a three-phase current source type 5-level grid-connected inverter and its control method, designed to offer a system with adjustable power factor for high-quality stable grid operation. This system is particularly suitable for grid integration of renewable energy generation, effectively suppressing the resonance of the CL filter and reducing harmonic distortion in grid current. Detailed simulations of the system demonstrate that the design maintains exceptional performance under various conditions, particularly showing outstanding adaptability and stability in response to grid voltage fluctuations and load changes.