Research on Harmonic Transfer of Metro Traction Rectifier Unit Based on Dynamic Phasor Method
The metro traction power supply system faces a potential stability threat,because of the AC and DC harmon-ics transfered and interacted by the nonlinear time-varying characteristics of traction rectifier unit.In order to reveal the internal transfer mechanism of AC and DC harmonics in traction rectifier unit,the dynamic phasor analysis expressions of voltage and current switching functions were used to describe the nonlinear time-varying characteristics of traction rectifier units,to analyze the influence of different connection modes of rectifier transformers on the switching function.The dynamic phasor calculation formulas for each order of switching function were given.Subsequently,the matrix opera-tion based on dynamic phasor was used to calculate the harmonic transfer of traction rectifier unit,including AC harmon-ic voltage transfer and DC harmonic current transfer,which completely simulated the harmonic transfer process of traction rectifier unit and clarified the conversion relationship of harmonic frequency.Finally,the accuracy and effective-ness of the proposed method were verified by comparing with the detailed electromagnetic transient simulation results in PSCAD/EMTDC,which could serve as a theory reference for filter device design and harmonic suppression strategy for-mulation.
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维普
