Time-optimal switching surface for photovoltaic MPPT

Francisco Paz, Rafael Peña-Alzola, Martin Ordonez

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

The dynamic response of photovoltaic (PV) power converters plays a critical role to perform fast Maximum Power Point Tracking (MPPT). Among different options, linear controllers are a very popular choice to control power converters due to their design simplicity and basic implementation. However, the simplicity of the controller comes with a sacrifice in the speed and performance given the extremely large operating range in PV applications (V OC to ISC). For example, in the boost topology, the Right-Half-Plane Zero induces overshoot and the severe inability to handle extreme operating points. In this paper, a non-linear controller based on phase-plane analysis is implemented for a boost converter for PV-battery charging applications. The novel proposed controller provides a number of advantages, including: 1) Faster transient response, close to the physical limit; 2) Overshoot elimination; 3) Minimization and tight handling of disturbances caused by changes in environmental conditions. The combination of these benefits translates into faster MPPT algorithms and a minimization of the losses during the MPPT scan process. A comparative analysis is presented to demonstrate the characteristic features of the controller, showing significant improvements over the traditional dual-loop linear controller tuned by an optimal method.

Original languageEnglish
Title of host publication2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2014
Place of PublicationPiscataway, N.J.
Number of pages5
DOIs
Publication statusPublished - 18 Aug 2014
Event2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2014 - Galway, Ireland
Duration: 24 Jun 201427 Jun 2014

Conference

Conference2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2014
CountryIreland
CityGalway
Period24/06/1427/06/14

Keywords

  • Maximum power point trackers (MPPT)
  • Nonlinear control systems
  • Solar power generation

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  • Cite this

    Paz, F., Peña-Alzola, R., & Ordonez, M. (2014). Time-optimal switching surface for photovoltaic MPPT. In 2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2014 [6878683]. https://doi.org/10.1109/PEDG.2014.6878683