三相无锁相环单次谐波检测法

doi:10.3969/j.issn.0255-8297.2018.05.006

Abstract

Abstract: The accuracy of traditional single harmonic detection method performs overdependency performance of PLL. When the network voltage distorts, the PLL will get wrong phase information. In this paper, a three-phase single harmonic detection method without phase locked loop is proposed to address this problem. By distinguishing the positive sequence components of the supply voltage by means of mathematical analysis, the voltage phase information can be precisely obtained. This method performs optimizes the function of PLL. In addition, the feasibility of the improved single harmonic detection method under the condition of three-phase voltage distortion is verified by principal analysis. And the detection accuracy of single phase harmonic detection without phase locked loop is simulated on PSCAD/EMTDC simulation plattorm. Finally, an experimental platform is built and experimental results prove the reliability of the proposed method.

Key words: active power filter, single harmonic detection, separation of positive and negative sequence, symmetrical component method, without phase locked loop

CLC Number:

TN713+.8

LI Wen-juan, SHAO Xue-xin, BAO Han, XU Wei. Three-Phase Single Harmonic Detection without Phase Locked Loop[J]. Journal of Applied Sciences, 2018, 36(5): 787-797.

References

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Three-Phase Single Harmonic Detection without Phase Locked Loop

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