基于改进型<em>p</em>-<em>q</em>算法的基波正序有功电流与谐波电流检测

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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 i_p-i_q algorithm under severe power grid operating conditions are analyzed. By fusing the robustness of the p-q algorithm, the real-time performance of the i_p-i_q 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.

Key words： p-q algorithm i_p-i_q fundamental positive-sequence active current harmonic current

Received: 28 October 2025

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	GAO Yucheng
	LI Jinbin
	SHAO Ming

Cite this article:

GAO Yucheng,LI Jinbin,SHAO Ming. Detection of fundamental positive-sequence active curent and harmonic current based on the improved p-q algorithm[J]. Electrical Engineering, 2026, 27(5): 11-19.

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https://dqjs.cesmedia.cn/EN/Y2026/V27/I5/11

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