Model Predictive Control of LC-Filtered Voltage Source Inverters with Optimal Switching Sequence

Changming Zheng, Tomislav Dragicevic, Zhenbin Zhang, Jose Rodriguez, Frede Blaabjerg

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Voltage source inverters with output LC filter enable a sinusoidal output voltage with low harmonics, suitable for islanded ac microgrid or uninterruptible power supply applications. Conventional finite-set model predictive voltage control (MPVC) applies only a single switching vector per control period, leading to a variable switching frequency and significant output ripple. This article resolves these issues by proposing an improved MPVC with optimal switching sequence (OSS-MPVC). First, an improved vector switching sequence is defined, aiming to reduce the output-voltage ripple with a constant switching frequency. Then, to tackle the difficulty in extending the OSS to high-order systems due to the coupling effect of the output filter, a generalized 'one-step estimation' solution is proposed, which directly associates the control-variable gradients with the vector switching sequence. To further enhance the output-voltage tracking accuracy, intersample dynamics are taken into account in the cost function. The control delay and dead-time compensation are also considered. Simulations and experimental results verify the feasibility of the proposed method.

Original languageEnglish
Article number9165198
Pages (from-to)3422-3436
Number of pages15
JournalIEEE Transactions on Power Electronics
Volume36
Issue number3
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Fixed switching frequency
  • inverters
  • microgrid
  • model predictive control (MPC)
  • optimal switching sequence (OSS)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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