基于实时阻抗角补偿的并网型电压源逆变器解耦电流控制

This paper proposes an impedance angle compensation (IAC)-based current control strategy for voltage source inverters (VSIs), to improve dynamic performance and mitigate cross-axis coupling under varying interface impedance, a common challenge in grid-tied renewable energy systems. Unlike traditional methods that rely on explicitly tuned feed-forward, feed-back, or complex compensators, the proposed approach introduces a real-time transformation based on the interface impedance angle. This transformation normalizes the plant transfer function, enabling conventional PI controllers to maintain high current regulation accuracy with minimal tuning. Experimental results demonstrate that the IAC method reduces overshoot to less than 0.1% and achieves consistent settling times of approximately 17-19 ms, even under ±40% impedance variation. Comparative analysis confirms superior transient response and decoupling performance over existing techniques. Additionally, by leveraging the predictability of the terminal voltage angle, the method ensures direct control trajectories and strong adaptability to real-world operating conditions. With low computational complexity and operational consistency, the IAC strategy presents a practical and scalable solution for grid-tied inverters and high-speed motor drives. This method is designed for single-phase grid-tied inverters and verified through simulation and experimental implementation.