A three-phase four-wire inverter control technique for a single distributed generation unit in Island mode

Min Dai, Mohammad Nanda Marwali, Jin Woo Jung, Ali Keyhani

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

Abstract

A control technique is developed for a three-phase four-wire split dc bus inverter of a single distributed generation unit working in island mode. The control technique combines an inner discrete-time sliding mode controlled (DSMC) current loop and an outer robust servomechanism controlled voltage loop. The control algorithms are developed under stationary αβ0 (Clarke's) reference frame and a modified space vector pulsewidth modulation (MSVPWM) is proposed to implement the algorithm under Clarke's reference frame. The proposed technique achieves voltage regulation with low steady state error and low total harmonic distortion and fast transient response under various load disturbances. Meanwhile the usage of MSVPWM in a stationary αβ0 reference frame yields better transient performance under limited dc bus voltage compared to conventional uniformly sampled sine wave modulation in ABC reference frame. In this paper, besides the development and description of the algorithms, a series of discussions, analysis and studies are performed on the proposed control technique, including the LC filter design issue, frequency domain closed-current-loop and closed-voltage-loop responses, and time domain simulations and experiments under various load conditions. All the analysis, simulations, and experiments demonstrate the effectiveness of the proposed control solution.

Original languageEnglish
Pages (from-to)322-331
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume23
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • Current control
  • Inverters
  • Optimal control
  • Power conversion
  • Pulsewidth modulation (PWM)
  • Robustness
  • Stability
  • Variable structure systems
  • Voltage control

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