Application of interphase inductor for parallel three-phase grid-connected inverters

Rui Li, Dian Guo Xu, Zhuang Xu, Xun Wen Su

Research output: Journal PublicationArticlepeer-review

4 Citations (Scopus)


To increase the power rating of three-phase grid-connected inverters, a topology of parallel three-phase grid-connected inverters composed of interphase inductors is proposed. The equivalent circuit was derived by decoupling the interphase inductors. Besides, the average-value models were obtained in the three-phase stationary coordinates and the synchronous rotating coordinates respectively. The fundamental mechanism of zero-sequence circulating current suppression with interphase inductors is that the interphase inductors can increase the impedance of zero-sequence circulating current. Then the control strategy of the system was designed according to the average-value model in the synchronous rotating coordinates. The zero-sequence circulating currents were suppressed well and the discrepancy and distortion of currents were overcome. Therefore, the reliability and efficiency of the system were improved. Finally, the parallel three-phase grid-connected inverters with the power rating of 1.5 MW were simulated, which verified the validity of the above analysis and control strategy.

Original languageEnglish
Pages (from-to)7-12
Number of pages6
JournalDianji yu Kongzhi Xuebao/Electric Machines and Control
Issue number12
Publication statusPublished - Dec 2012
Externally publishedYes


  • Average-value model
  • Grid-connected inverter
  • Interphase inductor
  • Parallel operation
  • Zero-sequence circulating current

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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