Influence of the Thermal Transient Response of Thermoelectric Generators in Maximum Power Point Tracking Algorithms

Thermoelectric generators (TEGs) are used in a wide range of applications to convert heat into electricity. Heat waste recovery systems or radioisotope thermoelectric generators (RTGs) are examples of such applications. In most scenarios, TEGs are operated with limited heat flux sources where the te...

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Published in:2023 13th European Space Power Conference (ESPC) pp. 1 - 5
Main Authors: Torrecilla, Marcos Compadre, Montecucco, Andrea, Siviter, Jonathan, Strain, Andrew, Knox, Andrew R
Format: Conference Proceeding
Language:English
Published: IEEE 02.10.2023
Subjects:
constant heat flux
Maximum power point trackers
MPPT
Space heating
Temperature
Thermal resistance
thermoelectric generators
Transient response
Waste heat
Waste recovery
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Abstract Thermoelectric generators (TEGs) are used in a wide range of applications to convert heat into electricity. Heat waste recovery systems or radioisotope thermoelectric generators (RTGs) are examples of such applications. In most scenarios, TEGs are operated with limited heat flux sources where the temperature difference across the TEG cannot be considered as constant due to the induced Peltier effect, which is considered as parasitic in electrical power generation systems. A proper understanding of the behavior of a TEG under constant, or limited, heat flux, along with the transient response to load changes, is fundamental for the development of optimal maximum power point tracking (MPPT) control techniques. Most MPPT control techniques developed for TEG applications optimize the power generated when the TEG operates under constant temperature gradient but are not optimized when the device operates under a limited heat flux. This paper presents the transient response of a TEG under constant heat flux conditions, which is used to build a model of the TEG. The model is then used to develop an MPPT algorithm that optimizes the generation of electrical power when operated with a limited heat source. This paper presents simulation and test results of the performance of the developed algorithm against two of the most widely used MPPT algorithms, perturb and observe (P&O) and fractional open circuit (FOV).
AbstractList Thermoelectric generators (TEGs) are used in a wide range of applications to convert heat into electricity. Heat waste recovery systems or radioisotope thermoelectric generators (RTGs) are examples of such applications. In most scenarios, TEGs are operated with limited heat flux sources where the temperature difference across the TEG cannot be considered as constant due to the induced Peltier effect, which is considered as parasitic in electrical power generation systems. A proper understanding of the behavior of a TEG under constant, or limited, heat flux, along with the transient response to load changes, is fundamental for the development of optimal maximum power point tracking (MPPT) control techniques. Most MPPT control techniques developed for TEG applications optimize the power generated when the TEG operates under constant temperature gradient but are not optimized when the device operates under a limited heat flux. This paper presents the transient response of a TEG under constant heat flux conditions, which is used to build a model of the TEG. The model is then used to develop an MPPT algorithm that optimizes the generation of electrical power when operated with a limited heat source. This paper presents simulation and test results of the performance of the developed algorithm against two of the most widely used MPPT algorithms, perturb and observe (P&O) and fractional open circuit (FOV).
Author Torrecilla, Marcos Compadre
Strain, Andrew
Knox, Andrew R
Siviter, Jonathan
Montecucco, Andrea
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  givenname: Marcos Compadre
  surname: Torrecilla
  fullname: Torrecilla, Marcos Compadre
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  givenname: Andrea
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  givenname: Jonathan
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  givenname: Andrew
  surname: Strain
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  givenname: Andrew R
  surname: Knox
  fullname: Knox, Andrew R
  email: a.knox@elec.gla.ac.uk
  organization: University of Glasgow,Glasgow,United Kingdom
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SubjectTerms constant heat flux
Maximum power point trackers
MPPT
Space heating
Temperature
Thermal resistance
thermoelectric generators
Transient response
Waste heat
Waste recovery
Title Influence of the Thermal Transient Response of Thermoelectric Generators in Maximum Power Point Tracking Algorithms
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