A Universal Three-phase Power System Harmonic Current Detection Method

doi:10.11985/2019.03.010

Abstract

Abstract:

Harmonic current detection is the precondition for harmonic suppression and power quality optimization. Considering traditional ip-iq detection methods have errors in three-phase asymmetric systems, an improved detection method based on ip-iq detection is proposed. By using symmetrical component method, trigonometric function transformation, coordinate transformation and other mathematical operations, the negative sequence components of the fundamental wave can be separated from the power grid current, which makes the result of harmonic current detection more accurate. By setting the frequency in the transformation matrix of the ip-iq detection method as a fixed value equaling to grid frequency, the problem of phase uncertainty caused by the phase locked loop can be eliminated. By adding zero sequence current separation modules, the method can also be applied to three-phase three wire and three-phase four wire circuits. Using the Matlab/Simulink software to model and verify the simulation results, the results show that the improved method can detect the harmonic current and fundamental current in the three-phase symmetrical system and asymmetric system more accurately, thus the feasibility of the improved method is proved.

Key words: Harmonic current detection, ip-iq detection, negative sequence component, non-phase locked loop, zero sequence components

CLC Number:

TM935

MENG Ying,WEN Xiaoyan. A Universal Three-phase Power System Harmonic Current Detection Method[J]. Journal of Electrical Engineering, 2019, 14(3): 67-73.

Figures/Tables 11

References 21

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畸变率(THD)/%	传统的ip-iq检测法				改进的ip-iq检测法
	三相对称		三相不对称		三相对称		三相不对称
	三相三线制	三相四线制	三相三线制	三相四线制	三相三线制	三相四线制	三相三线制	三相四线制
a相基波电流	50.24	–	27.83	–	0.55	0.55	0.19	0.34
a相谐波电流	78.19	–	133.89	–	0.52	0.52	1.28	1.98