Improved DC-Link Voltage Regulation Strategy for Grid-Connected Converters

Yonghao Gui (Corresponding author), Frede Blaabjerg, Xiongfei Wang, Jan D. Bendtsen, Dongsheng Yang, Jakob Stoustrup

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

In this article, an improved dc-link voltage regulation strategy is proposed for grid-connected converters applied in dc microgrids. For the inner loop of the grid-connected converter, a voltage modulated direct power control is employed to obtain two second-order linear time-invariant systems, which guarantees that the closed-loop system is globally exponentially stable. For the outer loop, a sliding mode control strategy with a load current sensor is employed to maintain a constant dc-link voltage even in the presence of constant power loads at the dc-side, which adversely affect the system stability. Furthermore, an observer for the dc-link current is designed to remove the dc current sensor at the same time improving the reliability and decreasing the cost. From both simulation and experimental results obtained from a 15-kVA prototype setup, the proposed method is demonstrated to improve the transient performance of the system and has robustness properties to handle parameter mismatches compared with the input-output linearization method.

Original languageEnglish
Article number9080581
Pages (from-to)4977-4987
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume68
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • DC microgrid
  • direct power control
  • grid-connected converter
  • observer
  • sliding mode control

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