Luis Marroyo

Bio: Luis Marroyo is an academic researcher from Universidad Pública de Navarra. The author has contributed to research in topics: Photovoltaic system & Maximum power point tracking. The author has an hindex of 40, co-authored 146 publications receiving 7985 citations. Previous affiliations of Luis Marroyo include Polytechnic University of Catalonia & ENSEEIHT.

Doubly Fed Induction Machine : Modeling and Control for Wind Energy Generation

Abstract: Analysis of Electric Machinery and Drive SystemsModeling and Control of AC Machine using MATLAB®/SIMULINKModeling, simulation and control of a doubly-fed induction machine controlled by a back-to-back converter[Model Predictive Control for Doubly-Fed Induction Generators and Three-Phase Power ConvertersHigh Performance Control of AC Drives with Matlab/SimulinkGreen EnergyModeling, Control and Analysis of a Doubly Fed Induction Generator Based Wind Turbine System with Voltage RegulationModel Predictive Control of Wind Energy Conversion SystemsModeling of Turbomachines for Control and Diagnostic ApplicationsModel Predictive Control for Doubly-Fed Induction Generators and Three-Phase Power ConvertersFrom Dynamic Modeling to Experimentation of Induction Motor Powered by Doubly-Fed Induction Generator by Passivity-Based ControlWind Driven Doubly Fed Induction GeneratorDynamics and Control of Electric Transmission and MicrogridsModeling and Modern Control of Wind PowerInduction Machines HandbookHigh Performance Control of AC Drives with Matlab / Simulink ModelsModeling and Analysis with Induction Generators, Third EditionPower Conversion and Control of Wind Energy SystemsModeling, Simulation and Control of Doubly-Fed Induction Machine Controlled by Back-to-Back ConverterDoubly Fed Induction GeneratorsWind FarmModeling and Control of AC Machine using MATLAB®/SIMULINKDoubly Fed Induction MachineModeling and Analysis of Doubly Fed Induction Generator Wind Energy SystemsAdvanced Control of Doubly Fed Induction Generator for Wind Power SystemsAdvanced Modeling and Analysis of the Doubly-fed Induction Generator Based Wind TurbinesPower Electronics for Renewable Energy Systems, Transportation and Industrial ApplicationsDoubly Fed Induction Generators2019 4th World Conference on Complex Systems (WCCS)Advanced Control of Doubly Fed Induction Generator for Wind Power SystemsModeling, Analysis, Control and Design Application Guidelines of Doubly Fed Induction Generator (DFIG) for Wind Power ApplicationsModeling, Identification and Control Methods in Renewable Energy SystemsAdvances in Systems, Control and AutomationRenewable Energy Devices and Systems with Simulations in MATLAB® and ANSYS®2018 IEEE PES/IAS PowerAfricaModeling of Wind Turbines with Doubly Fed Generator SystemAnalysis of Sub-synchronous Resonance (SSR) in Doubly-fed Induction Generator (DFIG)-Based Wind FarmsDoubly Fed Induction MachineWind Energy Generation: Modelling and ControlDoubly-fed Induction Generator Based Wind Power Plant Models

Transformerless Inverter for Single-Phase Photovoltaic Systems

Abstract: When no transformer is used in a grid-connected photovoltaic (PV) system, a galvanic connection between the grid and the PV array exists. In these conditions, dangerous leakage currents (common-mode currents) can appear through the stray capacitance between the PV array and the ground. In order to avoid these leakage currents, different inverter topologies that generate no varying common-mode voltages, such as the half-bridge and the bipolar pulsewidth modulation (PWM) full-bridge topologies, have been proposed. The need of a high-input voltage represents an important drawback of the half-bridge. The bipolar PWM full bridge requires a lower input voltage but exhibits a low efficiency. This letter proposes a new high-efficiency topology that generates no varying common-mode voltage and requires the same low-input voltage as the bipolar PWM full bridge. The proposed topology has been verified in a 5-kW prototype with satisfactory results

Transformerless Single-Phase Multilevel-Based Photovoltaic Inverter

Abstract: The elimination of the output transformer from grid- connected photovoltaic (PV) systems not only reduces the cost, size, and weight of the conversion stage but also increases the system overall efficiency. However, if the transformer is removed, the galvanic isolation between the PV generator and the grid is lost. This may cause safety hazards in the event of ground faults. In addition, the circulation of leakage currents (common-mode currents) through the stray capacitance between the PV array and the ground would be enabled. Furthermore, when no transformer is used, the inverter could inject direct current (dc) to the grid, causing the saturation of the transformers along the distribution network. While safety requirements in transformerless systems can be met by means of external elements, leakage currents and the injection of dc into the grid must be guaranteed topologically or by the inverter's control system. This paper proposes a new high-efficiency topology for transformerless systems, which does not generate common-mode currents and topologically guarantees that no dc is injected into the grid. The proposed topology has been verified in a 5-kW prototype with satisfactory results.

Modeling and Control of $N$ -Paralleled Grid-Connected Inverters With LCL Filter Coupled Due to Grid Impedance in PV Plants

Abstract: Designing adequate control laws for grid-connected inverters with LCL filters is complicated. The power quality standards and the system resonances burden the task. In order to deal with resonances, system damping has to be implemented. Active damping is preferred to passive damping so as to improve the efficiency of the conversion. In addition, paralleled grid-connected inverters in photovoltaic (PV) plants are coupled due to grid impedance. Generally, this coupling is not taken into account when designing the control laws. In consequence, depending on the number of paralleled grid-connected inverters and the grid impedance, the inverters installed in PV plants do not behave as expected. In this paper, the inverters of a PV plant are modeled as a multivariable system. The analysis carried out enables to obtain an equivalent inverter that describes the totality of inverters of a PV plant. The study is validated through simulation and field experiments. The coupling effect is described and the control law design of paralleled grid-connected inverters with LCL filters in PV plants is clarified.

Dynamic Behavior of the Doubly Fed Induction Generator During Three-Phase Voltage Dips

Abstract: The use of doubly fed induction generators (DFIGs) in large wind turbines has become quite common over the last few years. These machines provide variable speed and are driven with a power converter which is sized for a small percentage of the turbine-rated power. A drawback of the DFIG is that it is very sensitive to grid disturbances, especially to voltage dips. However, the operation of the machine in these situations has only been studied in the literature by means of simulations. This paper develops a theoretical analysis of the dynamic behavior of the induction machine during three-phase voltage dips. The proposed analysis contributes to understanding the causes of the problem and represents a very useful tool to improve the existing solutions and propose new alternatives. Experimental results are in good agreement with those obtained theoretically and validate the proposed analysis.

Recent Advances and Industrial Applications of Multilevel Converters

Abstract: Multilevel converters have been under research and development for more than three decades and have found successful industrial application. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. The aim of this paper is to group and review these recent contributions, in order to establish the current state of the art and trends of the technology, to provide readers with a comprehensive and insightful review of where multilevel converter technology stands and is heading. This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry. In addition, new promising topologies are discussed. Recent advances made in modulation and control of multilevel converters are also addressed. A great part of this paper is devoted to show nontraditional applications powered by multilevel converters and how multilevel converters are becoming an enabling technology in many industrial sectors. Finally, some future trends and challenges in the further development of this technology are discussed to motivate future contributions that address open problems and explore new possibilities.

A Survey on Cascaded Multilevel Inverters

Abstract: Cascaded multilevel inverters synthesize a medium-voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltages and input currents and also outstanding availability due to their intrinsic component redundancy. Due to these features, the cascaded multilevel inverter has been recognized as an important alternative in the medium-voltage inverter market. This paper presents a survey of different topologies, control strategies and modulation techniques used by these inverters. Regenerative and advanced topologies are also discussed. Applications where the mentioned features play a key role are shown. Finally, future developments are addressed.

Review of Nonisolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications

Abstract: The photovoltaic (PV) grid-connected power system in the residential applications is becoming a fast growing segment in the PV market due to the shortage of the fossil fuel energy and the great environmental pollution. A new research trend in the residential generation system is to employ the PV parallel-connected configuration rather than the series-connected configuration to satisfy the safety requirements and to make full use of the PV generated power. How to achieve high-step-up, low-cost, and high-efficiency dc/dc conversion is the major consideration due to the low PV output voltage with the parallel-connected structure. The limitations of the conventional boost converters in these applications are analyzed. Then, most of the topologies with high-step-up, low-cost, and high-efficiency performance are covered and classified into several categories. The advantages and disadvantages of these converters are discussed. Furthermore, a general conceptual circuit for high-step-up, low-cost, and high-efficiency dc/dc conversion is proposed to derive the next-generation topologies for the PV grid-connected power system. Finally, the major challenges of high-step-up, low-cost, and high-efficiency dc/dc converters are summarized. This paper would like to make a clear picture on the general law and framework for the next-generation nonisolated high-step-up dc/dc converters.

Medium-Voltage Multilevel Converters—State of the Art, Challenges, and Requirements in Industrial Applications

Abstract: This paper gives an overview of medium-voltage (MV) multilevel converters with a focus on achieving minimum harmonic distortion and high efficiency at low switching frequency operation. Increasing the power rating by minimizing switching frequency while still maintaining reasonable power quality is an important requirement and a persistent challenge for the industry. Existing solutions are discussed and analyzed based on their topologies, limitations, and control techniques. As a preferred option for future research and application, an inverter configuration based on three-level building blocks to generate five-level voltage waveforms is suggested. This paper shows that such an inverter may be operated at a very low switching frequency to achieve minimum on-state and dynamic device losses for highly efficient MV drive applications while maintaining low harmonic distortion.