This research investigates a low-cost generator and power electronics unit for smallscale (<10kW) wind turbines, for both standalone and grid-connected applications. The proposed system uses a high-inductance permanent magnet generator together with a switched-mode rectifier (SMR) to produce a variable magnitude output current. The high inductance characteristic allows the generator to operate as a current source, which has the following advantages over conventional low-inductance generator (voltage source) systems: it offers simple control, and avoids the need for bulky / costly energy storage elements, such as capacitors and inductors. The SMR duty-cycle is controlled in an open-loop manner such that 1) maximum power is obtained for wind speeds below rated, and 2) the output power and turbine speed is limited to safe values above rated wind speed. This topology also has the ability to extract power at low wind speeds, which is well suited to small-scale wind turbines, as there is often limited flexibility in their location and these commonly see low average wind speeds. The thesis is divided into two parts; the first part examines the use of the SMR as a DC-DC converter, for use in standalone applications. The duty-cycle is essentially kept constant, and is only varied for maximum power tracking and turbine speed / power limiting purposes. The SMR operates in to a fixed voltage source load, and has the ability to allow current and hence power to be drawn from the generator even at low wind and hence turbine speeds, making it ideal for battery charging applications. Initial dynamometer testing and limited wind-tunnel testing of a commercially available wind turbine show that turbine power can be maximised and its speed can be limited by adjusting the SMR duty-cycle in an open-loop manner. The second part of the thesis examines the use of the SMR as a DC-AC converter for grid-connected applications. The duty-cycle is now modulated sinusoidally at the mains frequency such that the SMR produces an output current that resembles a fullwave rectified sinewave that is synchronised to the mains voltage. An additional H-bridge inverter circuit and low-pass filter is used to unfold, filter and feed the sinusoidal output current in to the utility grid. Simulation and initial resistive load and preliminary grid-connected tests were used to prove the inverter concept, however, the permanent magnet generator current source is identified as non-ideal and causes unwanted harmonic distortion. The generator harmonics are analysed, and the system performance is compared with the Australian Standard THD requirement. It is concluded that the harmonics are caused by 1) the low-cost single-phase output design, 2) the use of an uncontrolled rectifier, and 3) the finite back-EMF voltage. The extent of these harmonics can be predicted based on the inverter operating conditions. A feed-forward current compensation control algorithm is investigated, and shown to be effective at removing the harmonics caused by the nonideal current source. In addition, the unipolar PWM switching scheme, and its harmonic components are analysed. The low-pass filter design is discussed, with an emphasis on power factor and THD grid requirements. A normalised filter design approach is used that shows how design aspects, such as cutoff frequency and quality factor, affect the filter performance. The filter design is shown to be a trade-off between the output current THD, power loss, and quality factor. The final chapter summarises the thesis with the design and simulation of a 1kW single-phase grid-connected inverter. The inverter is designed based on the low-pass filter and feed-forward compensation analysis, and is shown to deliver an output current to the utility grid that adheres to the Australian Standards. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1375316 / Thesis (Ph.D.) - University of Adelaide, School of Electrical and Electronic Engineering, 2009

Orientador: Carlos Alberto Canesin / Resumo: Frente aos novos desafios impostos ao cenário energético mundial, esta tese de doutorado implementa e analisa uma micro-rede de geração distribuída (GD), com acumulação e capacidade de operação conectada ou desconectada da rede de distribuição de energia elétrica (RDEE). A energia é fornecida à RDEE através de seis inversores monofásicos, constituindo uma rede trifásica, sendo três deles com capacidade de operação ilhada e conectada, e outros três com características de fonte de corrente que podem injetar energia de forma controlada, ativa ou reativa, no ponto de conexão comum (PCC). Através do sistema de acumulação com baterias do tipo chumbo-ácido, também é possível que o sistema minimize o consumo de energia da RDEE, mesmo quando não há energia solar, extraindo potência das baterias. Tendo em vista que a quase totalidade dos inversores utilizados em um sistema de GD fornecem somente potência ativa, ou trabalhem com fator de potência fixo, este trabalho também implementa o controle dinâmico de P e Q na micro-rede, atuando como compensador de tensão no PCC e promovendo melhorias na qualidade da energia elétrica. A micro-rede é gerenciada por um programa desenvolvido para o controle de todos os dispositivos essenciais presentes na GD, incluindo controle da carga e descarga do sistema de acumulação, controle dos contatores de conexão de todo o sistema, e controle do firmware dos inversores conectados, permitindo total liberdade de gestão da energia disponível, resultando numa ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Considering the new challenges imposed in the energetic scenario around the world, this PhD thesis implements and analyzes a micro-grid of Distributed Generation (DG) plant with accumulation and capability of operation connected or islanded from the electric power distribution grid. The system will supply power to the utility grid and local loads through six single-phase inverters, constituting a three-phase system, among which three are with capability to operate in islanded and connected mode, and the other three single-phase inverters with current source characteristic that can inject active or reactive power in a controlled manner at the point of common coupling (PCC). Through the accumulation system with lead-acid batteries technology, it is also possible that the system minimizes the utility grid consumption, though without solar energy. Given that most of the available inverters for DG are designed only to provide active power or to operate with a fixed power factor, this work, in the meantime, implements the dynamic control of the supplied active and reactive power (P and Q) in micro-grid, acting as a voltage compensator at the PCC to improve the quality of electric power. The micro-grid is managed by software designed to control and communicate with all essential devices in DG, including control of charge and discharge of the accumulation system, control of the whole system connection contactors, and the firmware control of grid connected inverters, which allow a wid... (Complete abstract click electronic access below) / Doutor

Submitted by MARCOS GUTIERREZ ALVES null (mmarkos.alves@gmail.com) on 2017-10-18T17:25:15Z No. of bitstreams: 1 Marcos Gutierrez Alves - Tese.pdf: 10359243 bytes, checksum: 24da24ccb395d0581201cc49607f4bf6 (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-10-23T18:18:25Z (GMT) No. of bitstreams: 1 alves_mg_dr_ilha.pdf: 10359243 bytes, checksum: 24da24ccb395d0581201cc49607f4bf6 (MD5) / Made available in DSpace on 2017-10-23T18:18:25Z (GMT). No. of bitstreams: 1 alves_mg_dr_ilha.pdf: 10359243 bytes, checksum: 24da24ccb395d0581201cc49607f4bf6 (MD5) Previous issue date: 2017-08-21 / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Frente aos novos desafios impostos ao cenário energético mundial, esta tese de doutorado implementa e analisa uma micro-rede de geração distribuída (GD), com acumulação e capacidade de operação conectada ou desconectada da rede de distribuição de energia elétrica (RDEE). A energia é fornecida à RDEE através de seis inversores monofásicos, constituindo uma rede trifásica, sendo três deles com capacidade de operação ilhada e conectada, e outros três com características de fonte de corrente que podem injetar energia de forma controlada, ativa ou reativa, no ponto de conexão comum (PCC). Através do sistema de acumulação com baterias do tipo chumbo-ácido, também é possível que o sistema minimize o consumo de energia da RDEE, mesmo quando não há energia solar, extraindo potência das baterias. Tendo em vista que a quase totalidade dos inversores utilizados em um sistema de GD fornecem somente potência ativa, ou trabalhem com fator de potência fixo, este trabalho também implementa o controle dinâmico de P e Q na micro-rede, atuando como compensador de tensão no PCC e promovendo melhorias na qualidade da energia elétrica. A micro-rede é gerenciada por um programa desenvolvido para o controle de todos os dispositivos essenciais presentes na GD, incluindo controle da carga e descarga do sistema de acumulação, controle dos contatores de conexão de todo o sistema, e controle do firmware dos inversores conectados, permitindo total liberdade de gestão da energia disponível, resultando numa importante ferramenta acadêmica de aprendizagem. Adicionalmente, a planta de GD é monitorada por meio de um programa de aquisição de dados do fluxo de energia elétrica que flui entre a GD e a RDEE, armazenando os dados relevantes em um banco de dados de informações para análises em longo prazo. É apresentada uma revisão bibliográfica para o cenário energético mundial e no Brasil, além das configurações de micro-rede com GD mais utilizadas no setor atualmente. O diagrama geral da micro-rede com GD é exposto, com descrição de cada equipamento e dimensionamento das fontes de energia solar. Finalmente, resultados experimentais e estruturas dos códigos são apresentados e discutidos. / Considering the new challenges imposed in the energetic scenario around the world, this PhD thesis implements and analyzes a micro-grid of Distributed Generation (DG) plant with accumulation and capability of operation connected or islanded from the electric power distribution grid. The system will supply power to the utility grid and local loads through six single-phase inverters, constituting a three-phase system, among which three are with capability to operate in islanded and connected mode, and the other three single-phase inverters with current source characteristic that can inject active or reactive power in a controlled manner at the point of common coupling (PCC). Through the accumulation system with lead-acid batteries technology, it is also possible that the system minimizes the utility grid consumption, though without solar energy. Given that most of the available inverters for DG are designed only to provide active power or to operate with a fixed power factor, this work, in the meantime, implements the dynamic control of the supplied active and reactive power (P and Q) in micro-grid, acting as a voltage compensator at the PCC to improve the quality of electric power. The micro-grid is managed by software designed to control and communicate with all essential devices in DG, including control of charge and discharge of the accumulation system, control of the whole system connection contactors, and the firmware control of grid connected inverters, which allow a wide control over the available energy and provide a significant academic studying platform. In addition, the energy flow between the DG and the utility grid is monitored through a power quality monitoring device, which is capable to send daily reports by email. In this way, a program was developed to store and recover all the relevant data in a database for the long-term analysis, compiling the results for easy interpretation. A literature review is presented for the world energy scenario, with more focus in Brazil, besides the micro-grid configurations with DG most used in the sector currently. This work also shows the general diagram of the micro-grid with DG describing the equipment and dimensioning the solar energy sources. Finally, it demonstrates and discusses experimental results and code structures.

Η επιβάρυνση του φυσικού περιβάλλοντος από τους συμβατικούς τρόπους ηλεκτροπαραγωγής έστρεψε τα τελευταία χρόνια την παγκόσμια ενεργειακή πολιτική στην ανάπτυξη και βελτίωση μεθόδων ηλεκτροπαραγωγής βασισμένων σε Ανανεώσιμες Πηγές Ενέργειας (ΑΠΕ). Αν και η ενσωμάτωση των ΑΠΕ στο δίκτυο μέσης τάσης δε συνοδεύεται από ιδιαίτερες πρακτικές δυσκολίες, δεν συμβαίνει το ίδιο και με το ηλεκτρικό δίκτυο των αστικών περιοχών, εξαιτίας της δομής των σύγχρονων μεγάλων αστικών κέντρων. Λαμβάνοντας υπόψη ότι οι μεγάλοι καταναλωτές (εργοστάσια και βιομηχανίες) θεωρούνται κατά κοινή πρακτική ως σταθερά φορτία, γίνεται κατανοητό πως ο βαθμός ανάπτυξης των αστικών κέντρων διαδραματίζει πολύ σημαντικό ρόλο τόσο στη ζήτηση ηλεκτρικής ενέργειας όσο και στη διαμόρφωση της αιχμής της καταναλισκόμενης ισχύος. Στο Ελληνικό Σύστημα Ηλεκτρικής Ενέργειας οι μήνες κατά τους οποίους βάλλεται περισσότερο η επάρκεια του ηλεκτρικού συστήματος επικεντρώνονται στη διάρκεια της θερινής περιόδου. Από την άλλη πλευρά, η μέγιστη παραγωγή ηλεκτρικής ενέργειας από την ηλιακή συμπίπτει χρονικά με τις ημερήσιες αιχμές ζήτησης των καλοκαιρινών μηνών. Συνεπώς, η χρήση μικρών ευέλικτων φωτοβολταϊκών (Φ/Β) συστημάτων, που μπορούν να εγκατασταθούν τόσο σε κατοικίες, όσο και σε εμπορικά ή δημοσία κτίρια (Διασυνδεδεμένα κτιριακά Φ/Β συστήματα) μπορεί να συμβάλει τόσο στην εξομάλυνση των αιχμών φορτίου όσο και στη μείωση του συνολικού κόστους ηλεκτροπαραγωγής. Η τελευταία και νεώτερη τεχνολογική τάση στα διασυνδεδεμένα κτιριακά φωτοβολταϊκά συστήματα είναι γνωστή με τον όρο Φωτοβολταϊκά Πλαίσια Εναλλασσομένου Ρεύματος (Φ/Β Πλαίσια Ε.Ρ). Πρόκειται για Φ/Β διατάξεις μικρής ισχύος (έως 300W), οι οποίες δημιουργούνται από την ενσωμάτωση ενός μόνο Φ/Β πλαισίου και ενός μονοφασικού αντιστροφέα σε μια αυτοτελή ηλεκτρονική διάταξη. Σκοπός της παρούσας εργασίας είναι η συμβολή της στον τομέα των Φ/Β μονάδων διεσπαρμένης παραγωγής, με την αναζήτηση μιας διάταξης διασύνδεσης φωτοβολταϊκών γεννητριών μικρής ισχύος με το ηλεκτρικό δίκτυο των αστικών περιοχών. Συγκεκριμένα, διερευνάται η δυνατότητα ανάπτυξης μιας ηλεκτρονικής διάταξης με απομόνωση, η οποία αφ’ ενός μεν θα εξασφαλίζει υψηλό συντελεστή ισχύος και υψηλό βαθμό απόδοσης για ευρύ φάσμα λειτουργίας, αφ’ ετέρου δε θα διέπεται από μικρό βαθμό πολυπλοκότητας στο κύκλωμα ισχύος της προκειμένου να εξασφαλίζεται υψηλή αξιοπιστία. Επιπρόσθετα, ιδιαίτερα χαρακτηριστικά αυτής της διάταξης θα πρέπει να είναι ο μικρός όγκος και το μικρό βάρος, ιδιότητες πολύ σημαντικές εάν αναλογιστούμε τις εφαρμογές για τις οποίες προορίζεται (ενσωμάτωση σε Φ/Β γεννήτριες που θα τοποθετηθούν σε όψεις ή οροφές κτιρίων). Το ενδιαφέρον της εργασίας εστιάσθηκε στον υψίσυχνο αντιστροφέα ρεύματος τοπολογίας Flyback. Για τη διάταξη αυτή διερευνήθηκαν δύο διαφορετικές τεχνικές ελέγχου (οι οποίες οδηγούν σε διαφορετικές καταστάσεις λειτουργίας) και ελέγχθηκε η καταλληλότητα τους για διαφορετικά επίπεδα ισχύος. Για τις δύο αυτές τεχνικές ελέγχου αναπτύχθηκαν μαθηματικά μοντέλα που συνδέουν τη μεταφερόμενη στο δίκτυο ισχύ με τις κατασκευαστικές παραμέτρους του αντιστροφέα και εξήχθησαν κριτήρια για τα ασφαλή όρια λειτουργίας του αντιστροφέα, με γνώμονα την καταπόνηση των ημιαγωγικών στοιχείων ισχύος. Επιπλέον, προτάθηκε η συνδυασμένη εφαρμογή των δύο τεχνικών ελέγχου και παρουσιάστηκε μια στρατηγική σχεδιασμού του αντιστροφέα, ώστε να γίνεται βέλτιστη επιλογή όλων των επιμέρους λειτουργικών του στοιχείων με ταυτόχρονη ελαχιστοποίηση του όγκου του, επίτευξη υψηλού συντελεστή ισχύος καθώς και υψηλού βαθμού απόδοσης, για ευρύ φάσμα της παραγόμενης ισχύος. Τέλος, διερευνήθηκε η δυνατότητα ανάπτυξης ενός ενεργού φίλτρου, για την αποτελεσματική εξομάλυνση της έντονης κυμάτωσης του ρεύματος εισόδου του προτεινόμενου αντιστροφέα. Η κυμάτωση αυτή είναι αποτέλεσμα της τροφοδότηση του μονοφασικού ηλεκτρικού δικτύου Ε.Ρ. από τη συνεχή τάση και το συνεχές ρεύμα που παράγουν οι φωτογεννήτριες και ο περιορισμός της είναι ιδιάζουσας σημασίας προκειμένου να καταστεί δυνατή η αποδοτική λειτουργία της όλης διάταξης. Η λειτουργία του προτεινόμενου ενεργού φίλτρου είναι ανεξάρτητη τόσο των καταστάσεων λειτουργίας του αντιστροφέα τύπου Flyback, όσο και γενικότερα της τοπολογίας του αντιστροφέα, καθιστώντας την έτσι ως μια ελκυστική λύση και για διαφορετικές τοπολογίες μετατροπέων. Η ακρίβεια των μαθηματικών μοντέλων, η ορθότητα της προτεινόμενης στρατηγικής σχεδιασμού και η αποτελεσματικότητα του προτεινόμενου ενεργού φίλτρου επιβεβαιώθηκαν μέσω προσομοίωσης και πειραματικών δοκιμών, ενώ τέλος παρατίθενται τα συμπεράσματα από το σύνολο της εργασίας. Η εργασία αυτή συγχρηματοδοτείται κατά: 80% της Δημόσιας Δαπάνης από την Ευρωπαϊκή Ένωση – Ευρωπαϊκό Κοινωνικό Ταμείο, 20% της Δημόσιας Δαπάνης από το Ελληνικό Δημόσιο – Υπουργείο Ανάπτυξης – Γενική Γραμματεία Έρευνας και Τεχνολογίας και από τον Ιδιωτικό Τομέα, στο πλαίσιο του Μέτρου 8.3 του Ε.Π. Ανταγωνιστικότητα – Γ΄ Κοινοτικό Πλαίσιο Στήριξης. / The aggravation of natural environment from the conventional ways of electricity generation turned during past few years the worldwide energy policy to the development and the improvement of electricity generation methods based on Renewable Energy Sources (RES). Although the interconnection of RES in the medium voltage network is not accompanied by particular practical difficulties, this is not the case for the electric network of urban regions, by reason of the structure of modern big urban centres. Taking into consideration that in common practice the big consumers (factories and industries) are considered as constant loads, it becomes comprehensible that the growth of urban centres plays very important role both in the demand of electrical energy and the formation of peak electricity power consumption. Τhe time period where the sufficiency of the Greek Electric Energy System is threatened is during the aestival period. On the other hand, the peak electricity production from solar energy coincides with the daily peak consumption of summer months. Consequently, the use of small flexible photovoltaic (PV) systems, installed in residences or in commercial and public buildings (BIPV – Building Integrated Photovoltaic’s), can contribute to the normalisation of electrical energy consumption as well as to the reduction of electricity generation total cost. The latest technology on small scale grid-connected residential PV systems is the Alternative Current Photovoltaic Modules (AC-PV Modules) where the power production varies under 0.3kW. An AC-PV Module is the combination of a single PV module and a single-phase power electronic inverter in a single electrical device. The scope of the present work is to contribute in the sector of the Dispersed Power Generation PV systems, with the development of an inverter that will be used for the interconnection of small PV generators with the electric network of urban regions. In more details, the development of an inverter with electrical isolation is investigated, which on the one hand it will ensure high power factor regulation and high efficiency for wide power range and on the other hand it will be characterised by simple power electronic circuit structure in order to ensure high reliability. Moreover, particular characteristics of this inverter should be the small volume and the small weight, attributes very important considering its applications (incorporation in PV generators that will be placed in aspects or roofs of buildings). The interest of present work is focused in the high frequency current source Flyback inverter. For this topology two different control techniques were investigated, leading to different operation modes. Moreover, their suitability is studied for different power levels. For both control techniques mathematic models were developed, connecting the transferred power in the public grid with the inverter operational parameters, as well as criteria for the inverter safe operation area were exported, considering the acceptable peak voltage and current values for the semiconductor switches. Moreover, the combined application of two control techniques is proposed and an optimum inverter design strategy is presented, aiming to the development of an inverter with the smallest possible volume, as well as to the achievement of high power factor regulation and high efficiency for wide power range. Last but not least, a current pulsation smoothing active filter is investigated and developed, which permits the elimination of the low frequency inverter input current. The current pulsation is a result of the power pulsation, due to the single-phase power generation, and its elimination is of great importance in order to exploit the maximum PV generated electricity power. The active filter configuration is independent from the inverter topology and its operation mode and hence it can be applied for various single stage topologies. The precision of the mathematic models, the correctness of the proposed design strategy and the effectiveness of the proposed active filter are validated via simulation and experimental results. Finally, the conclusions of whole study are exhibited. This thesis is part of the 03ED300 research project, implemented within the framework of the “Reinforcement Programme of Human Research Manpower” (PENED) and cofinanced by National and Community Funds (20% from the Greek Ministry of Development-General Secretariat of Research and Technology and 80% from E.U.- European Social Fund).

The necessity to incorporate renewable energy systems into existing electric power grid and need of efficient utilization of electrical energy are growing every day. A shunt connected Voltage Source Inverter(VSI) capable of bidirectional power flow and fast control has become one of the building block to address such requirements. However with growing number of grid connected VSI, new requirements related to harmonic injection, higher overall efficiency and better performances during short term grid disturbances have emerged as challenges. For this purpose a grid connected three phase four wire VSI with LCL filter can be considered as a general module to study different control approaches and system behavior under ideal and non-ideal grid conditions. This work focuses on achieving enhanced performance by analyzing effect of non-ideal conditions on system level and relating it to individual control blocks. In this work a phase locked loop structure has been proposed which is capable of extracting positive sequence fundamental phase information under non-ideal grid conditions. It can also be used in a single phase system without any structural modification. The current control for the three phase four wire VSI system has been implemented using Proportional Resonant (PR) controller in a per phase basis in stationary reference frame. A simplified controller design procedure based on asymptotic representation of the system transfer function is proposed. Using this method expressions for controller gains can be derived. A common mode model of the inverter system has been derived for low frequencies. Using this model a controller is designed to mitigate DC bus imbalance caused by sensor and ADC channel offsets. A multi-rate approach for digital implementation of PR controller with low resource consumption, that is suitable for an FPGA like digital controller ,is proposed. This multi-rate method can maintain resonance frequency accuracy even at low sampling frequency and can easily be frequency adaptive. Anti-wind up methods for PI controller have been studied to find suitable anti-wind up methods for PR controller. The tracking anti-wind up method is shown to be suitable for use with a PR controller. The effectiveness of this method under sudden disconnection and reconnection of VSI from grid is experimentally verified. A resonant integrator based second order filter is shown to be useful for active damping of LCL filter resonance with a wide range of grid inductance variation. The proposed method utilizes the LCL filter capacitor voltage to estimate resonance frequency current. Suitability of fundamental current PR controller for active damping alone, and with the proposed method show the superiority of the proposed method especially for low switching frequencies. Design oriented analysis of the above topics are included in the thesis. The theoretical understandings developed have been verified through experiments in the laboratory and can be readily implemented in industrial power electronic systems.

Ces dernières années, un intérêt croissant pour les systèmes électroniques de puissance a été motivé par l'émergence de sources d'énergie distribuées et renouvelables raccordées aux réseaux électriques. Dans ce contexte, la nécessité de topologies de faibles puissances alimentées par quelques modules photovoltaïques, en évitant l'utilisation de transformateurs, a ouvert l'étude de convertisseurs spéciaux et l’étude des stratégies de commande associées afin d’assurer la stabilité, la fiabilité et un rendement élevé du dispositif. Une possible solution est d’utiliser un dispositif générique connu dans la littérature scientifique et commerciale comme « micro-onduleur » ou «convertisseur intégré au module » qui avec le module photovoltaïque définit un produit « plug and play » appelé "module AC".Ce travail est consacré à l'étude d'un micro-onduleur monophasé avec deux étapes sans transformateur raccordée au réseau. La topologie proposée est composé d’un convertisseur DC-DC non isolé élévateur avec un gain quadratique et un onduleur réducteur lié au réseau connectés en cascade. Le convertisseur DC-DC extrait en permanence la puissance maximale du module photovoltaïque malgré les changements dans les conditions environnementales. L'étape DC-AC injecte la puissance extraite par l'étape DC-DC dans le réseau et assure un niveau élevé de qualité de l’énergie. Les efforts de recherche de ce travail sont concentrés sur la mise au point de commandes utilisant comment base, la théorie de contrôle par mode de glissement, qui conduit à une mise en œuvre simple avec une description théorique complète validée á partir de simulations et expérimentations.Après avoir décrit l'état de l’art dans le premier chapitre, le manuscrit est divisé en quatre chapitres, qui sont dédiés respectivement à l’algorithme de recherche du point de puissance maximale (MPPT), á l’étape de conversion DC-DC, á l'étape de conversion DC-AC et finalement au micro-onduleur complet. Un nouvel algorithme de recherche extrémal du point de puissance maximale est développé (SM-ESC). Pour la étape DC-DC, le convertisseur élévateur quadratique avec seulement un interrupteur contrôlé est étudié utilisant le concept de résistance sans perte par mode de glissement (de l’acronyme anglais : Sliding-Mode Loss-Free-Resistor – SM-LFR) afin d’obtenir un gain de tension élevé avec un fonctionnement sûr et compatible avec l’algorithme MPPT. Pour la étape DC-AC, le convertisseur de pont complet est contrôlé comme un onduleur de source de puissance (de l’acronyme anglais : Power Source Inverter - PSI) en utilisant une commande par mode de glissement qui poursuit une référence sinusoïdale de courant de sortie. Cette commande est complétée par une boucle de régulation de la tension du bus DC qui assure une haute qualité d’énergie injectée dans le réseau. Enfin, les trois étapes constitutives sont fusionnées pour obtenir un micro-onduleur complètement contrôlé par la technique de mode de glissement, ce qui constitue le principal résultat et contribution de cette thèse. / These last years, a growing interest in power electronic systems has been motivated by the emergence of distributed renewable energy resources and their interconnection with the grid. In this context, the need of low power topologies fed by a few photovoltaic modules avoiding the use of transformers opens the study of special converters and the associated control strategies ensuring stability, reliability and high efficiency. A resulted generic device known in the commercial and scientific literature as “microinverter” or “module integrated converter” performs a plug and play product together with the PV module called an “AC module”.This work is devoted to the study of a transformer-less single-phase double-stage grid-connected microinverter. The proposed topology has a non-isolated high-gain boost type DC-DC converter and a non-isolated buck type DC-AC converter connected in cascade through a DC bus. The DC-DC converter permanently extracts the maximum power of the PV module ensuring at the same time a good performance coping with power changes introduced by the change in the environmental conditions. The DC-AC stage injects the power extracted by the DC-DC stage into the grid ensuring a high level of power quality. The research efforts focus on the involved control functions based on the sliding mode control theory, which leads to a simple implementation with a comprehensive theoretical description validated through simulation and experimental results.After giving the state-of-the-art in the first chapter, the manuscript is divided into four chapters, which are dedicated to the Maximum Power Point Tracking (MPPT), the DC-DC stage and its control, the DC-AC stage and its control and the complete microinverter. A new Extremum Seeking Control (ESC) MPPT algorithm is proposed. The single-switch quadratic boost converter is studied operating as a Loss-Free-Resistor (LFR) obtaining a high DC output voltage level with a safe operation. The full-bridge converter is controlled as a Power Source Inverter (PSI) using a simple sliding-mode based tracking law, regulating the voltage of the DC bus and then ensuring a high power quality level in the grid connection. Finally, the three building blocks are merged to obtain a sliding mode controlled microinverter constituting the main result and contribution of the work