Cascaded Extended State Observer-Based Sliding Mode Control for DC-DC Converter with Time- Varying Power Fluctuation

Liangcai Xu, Jianxing Liu, Shengrong Zhuo, Yigeng Huangfu, Fei Gao

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a cascaded extended state observer- based sliding mode control (SMC) is proposed for the typical microgrid (MG) interfaced dc-dc boost converter. For a given MG system, the power fluctuation is unpredictable, which may cause an unstable dc-bus voltage. In that situation, all the dc-bus connected electronic loads cannot work normally. In order to maintain a stable dc-bus voltage, additional power sources with a suitable power converter and the advanced controller are necessary. Especially, the controller for the power converter plays a crucial role in reducing the power fluctuation and regulating the dc-bus voltage. In this paper, to improve the ability of the converters to reject external power disturbance, a cascaded extended state observer is designed to estimate the lumped disturbance more accurately. Besides, the continuous SMC method is adopted to provide a feedback control loop. The corresponding simulation results could highly validate the effectiveness of the proposed control method.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalIEEE Transactions on Industry Applications
DOIs
StateAccepted/In press - 2022

Keywords

  • DC-DC converter
  • DC-DC power converters
  • Fluctuations
  • Inductors
  • Observers
  • Power system stability
  • Resistors
  • Voltage control
  • cascaded extended state observer
  • sliding mode control
  • time-varying disturbance

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