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OA

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.