Three-Phase Inverter with Voltage-Current Dual-Loop Control

This paper introduces a three-phase inverter utilizing voltage-current dual-loop control, which efficiently converts DC power to AC power. The mathematical model of the inverter is analyzed under the two-phase synchronous rotating coordinate system (also known as the dq-frame), enabling the design of a voltage and current controller. The controller employs dual closed-loop regulation—inner current loop and outer voltage loop—using PI regulators to automatically adjust voltage and current parameters, ensuring stable and high-quality output current with minimized harmonic distortion. Key functions in implementation include Clark and Park transformations for coordinate conversion, as well as Space Vector Pulse Width Modulation (SVPWM) for generating switching signals. The performance of this inverter is thoroughly analyzed and evaluated, including dynamic response and steady-state accuracy, and compared with other inverter topologies. This type of three-phase inverter, with its robust dual-loop control structure, shows broad application potential in industrial production and energy conversion systems, such as renewable energy integration and motor drives.