A sliding mode control based stabilization solution for multiple constant power loads with identical input filters interfaced with the DC bus of a 'More Electric' Aircraft

Rahul Mishra, Mosaddique Nawaz Hussain, Vivek Agarwal

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

The DC onboard microgrid of a More Electric Aircraft (MEA) comprises of multiple Point Of Load (POL) converters to cater to diverse loads at different voltage levels. Lightly damped LC filters are typically used at the inputs of these POLs to reduce the noise in the system. Any tightly regulated POL acts like a Constant Power Load (CPL) and exhibits negative incremental impedance. The interaction of a CPL with its input filter leads to instability in the form of voltage oscillations at the input filter capacitor. The problem becomes more complex with multiple loads when identical LC input filters are used for the parallel CPLs connected to the same DC bus. The linear active damping solutions fail to stabilize such a system. To overcome this issue, a nonlinear solution based on Sliding Mode Control (SMC) is proposed. A parabolic sliding surface is presented which successfully stabilizes the system. Stability analysis using Eigen value plots are demonstrated. Extensive analytical results and simulation results are shown to validate the effectiveness of the proposed scheme.

Original languageEnglish
Pages1-6
Number of pages6
DOIs
StatePublished - Apr 27 2017
Externally publishedYes
Event2016 IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2016 - Trivandrum, Kerala, India
Duration: Dec 14 2016Dec 17 2016

Conference

Conference2016 IEEE International Conference on Power Electronics, Drives and Energy Systems, PEDES 2016
Country/TerritoryIndia
CityTrivandrum, Kerala
Period12/14/1612/17/16

Keywords

  • Constant Power Loads
  • MEA stability
  • Multiple filters
  • Point of Load converters
  • Sliding Mode Control

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