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Dissertation
Les problèmes de l'industrie agroalimentaire: les motivations et les pratiques mises en oeuvre par les initiatives de "circuit-court". Enquête en Province de Liège
Authors: --- --- ---
Year: 2018 Publisher: Liège Université de Liège (ULiège)

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Abstract

Over the last two centuries, the emergence of new technologies has profoundly changed the
way food is produced, distributed and consumed. Shifting from an agricultural to an
agribusiness status, the food system comprises nowadays a multitude of actors which are highly
dependent on one another with farmers being the least fortunate. Upwards, the latter depend on
a few multinational company owning the seeds and inputs essential to their production.
Downwards, a few powerful processers and distributors put pressure on their prices and impose
more and more constraints on them.
But not only farmers suffer from this evolution. The opacity of the whole food supply chain
leaves consumers unaware of the food they eat and conventional farming leads to the
destruction of biodiversity and environment as a whole.
Thus, a few actors decide to take actions to counter the undesirable effects generated by the
food system. By opting for alternative production methods – such as organic farming – and by
distributing food directly to final consumers, producers can free themselves from the companies
upwards and recoup the added-value they had lost to the benefit of the powerful companies
downwards.
In a first phase, this thesis introduces the problems of the food sector explaining them through
the concept of Market Failures. Then, the concept of Short Food Supply Chains is defined and
the organizations falling within its scope are listed and classified.
In a second phase, by carrying out a survey in the province of Liège (Belgium), this work seeks
to appreciate the diversity of these organizations. What activities do they carry out? What forms
do they take? What are the profiles of their creators and members? How do they finance
themselves? Then, the link between the profile of the members and creators of these
organizations, their motivations – the problems of the food sector they address – and their
practices – the actions they take to tackle those problems – is examined. Finally, the consistency
between the actions they take and the failures against which they claim to fight is reviewed.


Book
Power Converters in Power Electronics
Author:
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

In recent years, power converters have played an important role in power electronics technology for different applications, such as renewable energy systems, electric vehicles, pulsed power generation, and biomedical sciences. Power converters, in the realm of power electronics, are becoming essential for generating electrical power energy in various ways. This Special Issue focuses on the development of novel power converter topologies in power electronics. The topics of interest include, but are not limited to: Z-source converters; multilevel power converter topologies; switched-capacitor-based power converters; power converters for battery management systems; power converters in wireless power transfer techniques; the reliability of power conversion systems; and modulation techniques for advanced power converters.

Keywords

History of engineering & technology --- current source converter --- power decoupling --- power ripple --- computational complexity --- direct power control --- finite control set model predictive control --- PI controllers --- space vector modulation --- three-level T-type inverter --- input current ripple --- voltage multiplier --- shoot through state --- quasi-switched boost inverter --- Z-source inverter --- transformerless --- SEPIC converter --- single phase --- cascaded H-bridge inverter --- three-phase inverter --- Z-source network --- quasi-switched-boost network --- shoot-through --- quasi-z-source inverter --- grid-tied --- leakage current --- power efficiency --- counter-based --- one-comparator --- PWFM --- PWM --- PFM --- dc converter --- full bridge converter --- zero voltage operation --- multilevel inverter --- Pulse Width Modulation --- minimal number of commutations --- state machine --- Neutral Point Clamped Converter --- power converters --- EMI --- intelligent control --- classical gate driver --- interference sources --- carrier-based pulse width modulation --- offset function --- switching loss reduction --- H-bridge five-level inverter --- electromagnetic compatibility (EMC) --- switching model power supply (SMPS) --- conducted emission --- parametric modeling method --- vector fitting algorithm --- full-power testing --- high-power --- individual phase --- operation test --- static synchronous compensator (STATCOM) --- bidirectional DC/DC converter (BDC) --- dual mode operation --- current sharing --- multiplexed modulation --- low-voltage and high-current --- Lyapunov algorithm --- current sharing control --- confluence plate --- state feedback linearization --- grid-connected inverter --- LCL filter --- inductive power transfer (IPT) --- three-bridge switching --- constant current (CC) --- constant voltage (CV) --- fixed frequency --- fractional order elements --- high-frequency switching --- wireless power transmission --- active balance circuit --- bi-directional converter --- lithium battery --- series-connected battery --- fast charging --- motor drives --- full-bridge Buck inverter --- DC motor --- mathematical model --- differential flatness --- time-varying duty cycle --- circuit simulation --- experimental validation --- current source inverter --- common-mode voltage --- diode clamped multilevel inverter --- flying capacitor multilevel inverter --- cascade H bridge multilevel inverter --- total harmonic distortion --- PWM control techniques --- PSCAD/MULTISIM simulation --- model predictive control (MPC) --- neutral-point clamped (NPC) inverter --- disturbance observer --- parameter uncertainty --- stability analysis --- power factor adjustment --- matrix rectifier --- peak-current-mode (PCM) control --- boost converter --- stability --- parameter perturbation --- target period orbit tracking --- space-vector pulse-width modulation --- common-mode voltage elimination --- quasi-switched boost --- impedance network --- add-on pulse charger --- quick charge --- pulse charging --- Li-ion battery --- full bridge (FB) --- modular multilevel dc-dc converters (MMDCs) --- zero-voltage switching (ZVS) --- zero-current switching (ZCS) --- Photovoltaics --- Z-Source --- Current-fed --- Medium-Frequency --- Power-Imbalance --- harmonic --- RPWM --- selective voltage harmonic elimination --- single-phase inverter --- n/a


Book
Power Converters in Power Electronics
Author:
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Bookmark

Abstract

In recent years, power converters have played an important role in power electronics technology for different applications, such as renewable energy systems, electric vehicles, pulsed power generation, and biomedical sciences. Power converters, in the realm of power electronics, are becoming essential for generating electrical power energy in various ways. This Special Issue focuses on the development of novel power converter topologies in power electronics. The topics of interest include, but are not limited to: Z-source converters; multilevel power converter topologies; switched-capacitor-based power converters; power converters for battery management systems; power converters in wireless power transfer techniques; the reliability of power conversion systems; and modulation techniques for advanced power converters.

Keywords

current source converter --- power decoupling --- power ripple --- computational complexity --- direct power control --- finite control set model predictive control --- PI controllers --- space vector modulation --- three-level T-type inverter --- input current ripple --- voltage multiplier --- shoot through state --- quasi-switched boost inverter --- Z-source inverter --- transformerless --- SEPIC converter --- single phase --- cascaded H-bridge inverter --- three-phase inverter --- Z-source network --- quasi-switched-boost network --- shoot-through --- quasi-z-source inverter --- grid-tied --- leakage current --- power efficiency --- counter-based --- one-comparator --- PWFM --- PWM --- PFM --- dc converter --- full bridge converter --- zero voltage operation --- multilevel inverter --- Pulse Width Modulation --- minimal number of commutations --- state machine --- Neutral Point Clamped Converter --- power converters --- EMI --- intelligent control --- classical gate driver --- interference sources --- carrier-based pulse width modulation --- offset function --- switching loss reduction --- H-bridge five-level inverter --- electromagnetic compatibility (EMC) --- switching model power supply (SMPS) --- conducted emission --- parametric modeling method --- vector fitting algorithm --- full-power testing --- high-power --- individual phase --- operation test --- static synchronous compensator (STATCOM) --- bidirectional DC/DC converter (BDC) --- dual mode operation --- current sharing --- multiplexed modulation --- low-voltage and high-current --- Lyapunov algorithm --- current sharing control --- confluence plate --- state feedback linearization --- grid-connected inverter --- LCL filter --- inductive power transfer (IPT) --- three-bridge switching --- constant current (CC) --- constant voltage (CV) --- fixed frequency --- fractional order elements --- high-frequency switching --- wireless power transmission --- active balance circuit --- bi-directional converter --- lithium battery --- series-connected battery --- fast charging --- motor drives --- full-bridge Buck inverter --- DC motor --- mathematical model --- differential flatness --- time-varying duty cycle --- circuit simulation --- experimental validation --- current source inverter --- common-mode voltage --- diode clamped multilevel inverter --- flying capacitor multilevel inverter --- cascade H bridge multilevel inverter --- total harmonic distortion --- PWM control techniques --- PSCAD/MULTISIM simulation --- model predictive control (MPC) --- neutral-point clamped (NPC) inverter --- disturbance observer --- parameter uncertainty --- stability analysis --- power factor adjustment --- matrix rectifier --- peak-current-mode (PCM) control --- boost converter --- stability --- parameter perturbation --- target period orbit tracking --- space-vector pulse-width modulation --- common-mode voltage elimination --- quasi-switched boost --- impedance network --- add-on pulse charger --- quick charge --- pulse charging --- Li-ion battery --- full bridge (FB) --- modular multilevel dc-dc converters (MMDCs) --- zero-voltage switching (ZVS) --- zero-current switching (ZCS) --- Photovoltaics --- Z-Source --- Current-fed --- Medium-Frequency --- Power-Imbalance --- harmonic --- RPWM --- selective voltage harmonic elimination --- single-phase inverter --- n/a


Book
Power Converters in Power Electronics
Author:
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

Loading...
Export citation

Choose an application

Bookmark

Abstract

In recent years, power converters have played an important role in power electronics technology for different applications, such as renewable energy systems, electric vehicles, pulsed power generation, and biomedical sciences. Power converters, in the realm of power electronics, are becoming essential for generating electrical power energy in various ways. This Special Issue focuses on the development of novel power converter topologies in power electronics. The topics of interest include, but are not limited to: Z-source converters; multilevel power converter topologies; switched-capacitor-based power converters; power converters for battery management systems; power converters in wireless power transfer techniques; the reliability of power conversion systems; and modulation techniques for advanced power converters.

Keywords

History of engineering & technology --- current source converter --- power decoupling --- power ripple --- computational complexity --- direct power control --- finite control set model predictive control --- PI controllers --- space vector modulation --- three-level T-type inverter --- input current ripple --- voltage multiplier --- shoot through state --- quasi-switched boost inverter --- Z-source inverter --- transformerless --- SEPIC converter --- single phase --- cascaded H-bridge inverter --- three-phase inverter --- Z-source network --- quasi-switched-boost network --- shoot-through --- quasi-z-source inverter --- grid-tied --- leakage current --- power efficiency --- counter-based --- one-comparator --- PWFM --- PWM --- PFM --- dc converter --- full bridge converter --- zero voltage operation --- multilevel inverter --- Pulse Width Modulation --- minimal number of commutations --- state machine --- Neutral Point Clamped Converter --- power converters --- EMI --- intelligent control --- classical gate driver --- interference sources --- carrier-based pulse width modulation --- offset function --- switching loss reduction --- H-bridge five-level inverter --- electromagnetic compatibility (EMC) --- switching model power supply (SMPS) --- conducted emission --- parametric modeling method --- vector fitting algorithm --- full-power testing --- high-power --- individual phase --- operation test --- static synchronous compensator (STATCOM) --- bidirectional DC/DC converter (BDC) --- dual mode operation --- current sharing --- multiplexed modulation --- low-voltage and high-current --- Lyapunov algorithm --- current sharing control --- confluence plate --- state feedback linearization --- grid-connected inverter --- LCL filter --- inductive power transfer (IPT) --- three-bridge switching --- constant current (CC) --- constant voltage (CV) --- fixed frequency --- fractional order elements --- high-frequency switching --- wireless power transmission --- active balance circuit --- bi-directional converter --- lithium battery --- series-connected battery --- fast charging --- motor drives --- full-bridge Buck inverter --- DC motor --- mathematical model --- differential flatness --- time-varying duty cycle --- circuit simulation --- experimental validation --- current source inverter --- common-mode voltage --- diode clamped multilevel inverter --- flying capacitor multilevel inverter --- cascade H bridge multilevel inverter --- total harmonic distortion --- PWM control techniques --- PSCAD/MULTISIM simulation --- model predictive control (MPC) --- neutral-point clamped (NPC) inverter --- disturbance observer --- parameter uncertainty --- stability analysis --- power factor adjustment --- matrix rectifier --- peak-current-mode (PCM) control --- boost converter --- stability --- parameter perturbation --- target period orbit tracking --- space-vector pulse-width modulation --- common-mode voltage elimination --- quasi-switched boost --- impedance network --- add-on pulse charger --- quick charge --- pulse charging --- Li-ion battery --- full bridge (FB) --- modular multilevel dc-dc converters (MMDCs) --- zero-voltage switching (ZVS) --- zero-current switching (ZCS) --- Photovoltaics --- Z-Source --- Current-fed --- Medium-Frequency --- Power-Imbalance --- harmonic --- RPWM --- selective voltage harmonic elimination --- single-phase inverter --- current source converter --- power decoupling --- power ripple --- computational complexity --- direct power control --- finite control set model predictive control --- PI controllers --- space vector modulation --- three-level T-type inverter --- input current ripple --- voltage multiplier --- shoot through state --- quasi-switched boost inverter --- Z-source inverter --- transformerless --- SEPIC converter --- single phase --- cascaded H-bridge inverter --- three-phase inverter --- Z-source network --- quasi-switched-boost network --- shoot-through --- quasi-z-source inverter --- grid-tied --- leakage current --- power efficiency --- counter-based --- one-comparator --- PWFM --- PWM --- PFM --- dc converter --- full bridge converter --- zero voltage operation --- multilevel inverter --- Pulse Width Modulation --- minimal number of commutations --- state machine --- Neutral Point Clamped Converter --- power converters --- EMI --- intelligent control --- classical gate driver --- interference sources --- carrier-based pulse width modulation --- offset function --- switching loss reduction --- H-bridge five-level inverter --- electromagnetic compatibility (EMC) --- switching model power supply (SMPS) --- conducted emission --- parametric modeling method --- vector fitting algorithm --- full-power testing --- high-power --- individual phase --- operation test --- static synchronous compensator (STATCOM) --- bidirectional DC/DC converter (BDC) --- dual mode operation --- current sharing --- multiplexed modulation --- low-voltage and high-current --- Lyapunov algorithm --- current sharing control --- confluence plate --- state feedback linearization --- grid-connected inverter --- LCL filter --- inductive power transfer (IPT) --- three-bridge switching --- constant current (CC) --- constant voltage (CV) --- fixed frequency --- fractional order elements --- high-frequency switching --- wireless power transmission --- active balance circuit --- bi-directional converter --- lithium battery --- series-connected battery --- fast charging --- motor drives --- full-bridge Buck inverter --- DC motor --- mathematical model --- differential flatness --- time-varying duty cycle --- circuit simulation --- experimental validation --- current source inverter --- common-mode voltage --- diode clamped multilevel inverter --- flying capacitor multilevel inverter --- cascade H bridge multilevel inverter --- total harmonic distortion --- PWM control techniques --- PSCAD/MULTISIM simulation --- model predictive control (MPC) --- neutral-point clamped (NPC) inverter --- disturbance observer --- parameter uncertainty --- stability analysis --- power factor adjustment --- matrix rectifier --- peak-current-mode (PCM) control --- boost converter --- stability --- parameter perturbation --- target period orbit tracking --- space-vector pulse-width modulation --- common-mode voltage elimination --- quasi-switched boost --- impedance network --- add-on pulse charger --- quick charge --- pulse charging --- Li-ion battery --- full bridge (FB) --- modular multilevel dc-dc converters (MMDCs) --- zero-voltage switching (ZVS) --- zero-current switching (ZCS) --- Photovoltaics --- Z-Source --- Current-fed --- Medium-Frequency --- Power-Imbalance --- harmonic --- RPWM --- selective voltage harmonic elimination --- single-phase inverter

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