Abstract：To address the challenge of extracting fundamental positive-sequence current and specified-order harmonic currents in complex power grid environments, this paper proposes an improved p-q algorithm. Founded on the reactive power theory, the limitations of the traditional p-q algorithm and ip-iq algorithm under severe power grid operating conditions are analyzed. By fusing the robustness of the p-q algorithm, the real-time performance of the ip-iq algorithm, and a fine harmonic component detection mechanism, a detection algorithm more suitable for complex operating conditions is developed. Simulation results demonstrate that, compared with conventional detection methods based on the average-current theory and the second-order generalized integrator (SOGI) approach, the proposed improved algorithm can still quickly and accurately extract the active and reactive components of fundamental positive-sequence current, as well as the active and reactive components of specified-order harmonic positive-sequence/negative-sequence currents, even when the grid voltage suffers from simultaneous severe distortion and asymmetry.
高宇承, 李锦彬, 邵明. 基于改进型p-q算法的基波正序有功电流与谐波电流检测[J]. 电气技术, 2026, 27(5): 11-19.
GAO Yucheng, LI Jinbin, SHAO Ming. Detection of fundamental positive-sequence active curent and harmonic current based on the improved p-q algorithm. Electrical Engineering, 2026, 27(5): 11-19.
2026, Vol. 27 
