A Composite Nonlinear Controller Design to Enhance the Large-Signal Stability of a DC Distribution System with Constant Power Loads

S. K. Ghosh, T. K. Roy, M. A.H. Pramanik, M. A. Mahmud

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A composite backstepping integral sliding mode controller (BISMC) is proposed in this work for a DC-DC boost converter feeding a constant power load (CPL) in a simple DC distribution system. Here, the main objective is to ensure the large-signal stability with wide variations in operating regions. The proposed BISMC is designed based on the feedback linearized model of the DC-DC boost converter with a CPL where the average state-space model is exactly linearized. The use of exact feedback linearization overcomes the non-minimum phase problem of a DC-DC boost converter due to the presence of the CPL that exhibits negative impedance characteristics. The control law is obtained using the combination of backstepping and integral sliding mode control schemes where both approaches ensure the faster convergence of errors for all states and the integral action on the sliding surface is designed in such a fashion that will ensure the constant frequency operation of the power converter feeding the CPL while eliminating the variable frequency associated problem of the existing controllers. In addition, the stability of the whole system is analyzed through the Lyapunov stability theory. Numerical simulations are conducted to verify the performance of the designed composite nonlinear controller whose performance is also compared with a double-loop proportional integral (PI) controller to verify the superiority of the designed controller.

Original languageEnglish
Title of host publicationProceedings of 2021 IEEE 2nd International Conference on Smart Technologies for Power, Energy and Control, STPEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781665443197
ISBN (Print)9781665443203
DOIs
Publication statusPublished - 2021
Externally publishedYes
Event2nd IEEE International Conference on Smart Technologies for Power, Energy and Control, STPEC 2021 - Bilaspur, India
Duration: 19 Dec 202122 Dec 2021

Publication series

NameProceedings of 2021 IEEE 2nd International Conference on Smart Technologies for Power, Energy and Control, STPEC 2021

Conference

Conference2nd IEEE International Conference on Smart Technologies for Power, Energy and Control, STPEC 2021
Country/TerritoryIndia
CityBilaspur
Period19/12/2122/12/21

Keywords

  • backstepping integral sliding mode controller
  • Constant power load
  • exact feedback linearization approach
  • Lyapunov stability theory
  • negative impedance characteristics
  • nonlinear dynamical model

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