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Efficient approach to characterising harmonic currents generated by a cluster of three-phase AC/DC converters

Efficient approach to characterising harmonic currents generated by a cluster of three-phase AC/DC converters

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Published

An efficient approach to characterising harmonic currents generated by a cluster of parallel-operated AC/DC converters in the steady state is presented. The approach is carried out in the time domain and the interactions between converters are considered. In calculating harmonic currents generated by a single converter, the Poincaré map-based approach is applied to increase the computational efficiency. A solution procedure that is sequentially solving a single-converter problem with detailed model in the time domain, while the others are fixed as equivalent AC current sources, is proposed to find the overall source-side harmonic currents. The computed AC-side harmonic components of each converter current are then extracted via FFT. Solutions obtained by the proposed method are compared with those obtained by using a brute-force time-domain simulation tool, Simulink. It is shown that the AC-side harmonic currents determined by the proposed approach agree well with those obtained by the time-domain simulation tool, but the solution time is significantly reduced. Therefore, the proposed approach is useful for quantifying harmonic currents generated by a cluster of AC/DC converters and to facilitate the harmonic mitigation implementations, such as passive and active harmonic filter designs, for complying with harmonic standards such as IEC 61000-3-4 and IEEE-519. In addition, the proposed approach is suitable for characterising harmonic currents generated by other types of power-electronic devices, such as AC and/or DC drives, operated in parallel simultaneously. The solution algorithm can also be integrated into a harmonic power flow program for penetration studies to provide a fast quantification of the impact of multiple harmonic sources on the power system.

Inspec keywords: Poincare mapping; fast Fourier transforms; power conversion harmonics; power electronics; IEEE standards; AC-DC power convertors; IEC standards; harmonic generation; harmonics suppression; time-domain analysis

Other keywords: harmonic current generation; power-electronic device; FFT; three-phase AC-DC converter; power flow; brute-force time-domain simulation; Poincare map-based approach; IEEE-519; IEC 61000-3-4; harmonic filter; AC-DC drive

Subjects: Integral transforms; Power convertors and power supplies to apparatus

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