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In electrified liquefied natural gas (LNG) plants variable frequency drives (VFDs) interact with turbine-generator (TG) units creating torsional vibrations known as sub-synchronous torsional interactions (SSTIs). Torsional vibrations can be dangerous for an LNG plant when they involve torsional instability. The stability of an LNG plant depends on the plant configuration and on the number of TG units and of VFDs. In such peculiar configurations stability cannot be achieved acting of the VFDs control system. Alternatively, dedicated equipment is needed to damp the torsional vibrations. In this paper, a sub-synchronous damper (SSD) converter is used to mitigate the SSTI phenomena. The SSD converter consists of a thyristor H-bridge regulating the phase of the additional torque provided at the TG unit air-gap. A phase control system is proposed and is based on the torsional torque oscillations measurement. An adaptive reference signal is employed, also guaranteeing high performance in island-mode operation. The proposed solution increases the damping of the LNG plant in all the considered configurations. The LNG plant successful operation is validated by comprehensive results.
Lorenzo Bongini; Rosa Anna Mastromauro; Daniele Sgrò; Fabrizio Malvaldi. Phase-Controlled Thyristor Sub-Synchronous Damper Converter for a Liquefied Natural Gas Plant. Energies 2021, 14, 5238 .
AMA StyleLorenzo Bongini, Rosa Anna Mastromauro, Daniele Sgrò, Fabrizio Malvaldi. Phase-Controlled Thyristor Sub-Synchronous Damper Converter for a Liquefied Natural Gas Plant. Energies. 2021; 14 (17):5238.
Chicago/Turabian StyleLorenzo Bongini; Rosa Anna Mastromauro; Daniele Sgrò; Fabrizio Malvaldi. 2021. "Phase-Controlled Thyristor Sub-Synchronous Damper Converter for a Liquefied Natural Gas Plant." Energies 14, no. 17: 5238.
The research of innovative solutions to improve the efficiency of electric drives is of considerable interest to challenges related to energy savings and sustainable development. In order to successfully validate the adoption of new and innovative software or hardware solutions in the field of electric drives, accurate measurement procedures for either efficiency or power losses are needed. Moreover, high accuracy and expensive measurement equipment are required to satisfy international standard prescriptions. In this scenario, this paper describes an accurate measurement procedure, which is independent of the accuracy of the adopted instrumentation, for the power losses variations involved in electrical drives, namely ΔΔP, useful to detect the efficiency enhancement (or power losses reduction) due to the real-time modification of the related control algorithm. The goal is to define a valuable measurement procedure capable of comparing the impact of different control algorithms on electric drive performance. This procedure is carried out by experimentally verifying the action of different control algorithms by the use of a Field Oriented Control (FOC) with different values of the direct-axis current component (i.e., Id = 0 A and Id = −1 A) applied for fixed working conditions in terms of speed and load torque. Two different measurement systems of power losses, each one characterized by different accuracy and cost, are taken into account for the validation of the proposed method. An investigation is, then, carried out, based on the comparison between the measurements acquired by both instrumentations, for different working conditions in terms of load and speed, highlighting that the uncertainty generated by systematic errors does not affect the ΔΔP measurements. The results reported in this work demonstrate how the ΔΔP parameter can be used as a valuable index for the characterization of the power drive system, which can also be evaluated even with low-accuracy instrumentation.
Massimo Caruso; Antonino Di Tommaso; Giuseppe Lisciandrello; Rosa Mastromauro; Rosario Miceli; Claudio Nevoloso; Ciro Spataro; Marco Trapanese. A General and Accurate Measurement Procedure for the Detection of Power Losses Variations in Permanent Magnet Synchronous Motor Drives. Energies 2020, 13, 5770 .
AMA StyleMassimo Caruso, Antonino Di Tommaso, Giuseppe Lisciandrello, Rosa Mastromauro, Rosario Miceli, Claudio Nevoloso, Ciro Spataro, Marco Trapanese. A General and Accurate Measurement Procedure for the Detection of Power Losses Variations in Permanent Magnet Synchronous Motor Drives. Energies. 2020; 13 (21):5770.
Chicago/Turabian StyleMassimo Caruso; Antonino Di Tommaso; Giuseppe Lisciandrello; Rosa Mastromauro; Rosario Miceli; Claudio Nevoloso; Ciro Spataro; Marco Trapanese. 2020. "A General and Accurate Measurement Procedure for the Detection of Power Losses Variations in Permanent Magnet Synchronous Motor Drives." Energies 13, no. 21: 5770.
Liquefied Natural Gas (LNG) plants are commonly island-operated weak grids where the interaction of high-power Variable Frequency Drives (VFDs) with the Turbine-Generator (TG) units might cause Sub-Synchronous Torsional Interaction (SSTI) phenomena. SSTI phenomena can lead the LNG plant to instability conditions. Each LNG plant configuration is characterized by a risk level, which is considered high when the electrical damping at the TG Torsional Natural Frequencies (TNFs) is negative. Starting from a real case study, a detailed electromechanical model of an LNG plant is presented. The model is comprehensive of the control system of the power conversion stage and of the TG unit. Sensitivity analysis, performed on control system parameters, allows one to detect the parameters that impact the electrical damping and the stability of the overall LNG plant. A complete simulation platform is developed. Experimental results are carried out on a real LNG plant considering four different configurations. The theoretical model and the simulation platform allow one to estimate the electrical damping and the results are confirmed by the experimental validation. It is demonstrated that fine tuning of the power conversion stage control parameters can reduce the risk related to torsional instability.
Lorenzo Bongini; Rosa Anna Mastromauro; Daniele Sgrò; Fabrizio Malvaldi. Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation. Energies 2020, 13, 4084 .
AMA StyleLorenzo Bongini, Rosa Anna Mastromauro, Daniele Sgrò, Fabrizio Malvaldi. Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation. Energies. 2020; 13 (16):4084.
Chicago/Turabian StyleLorenzo Bongini; Rosa Anna Mastromauro; Daniele Sgrò; Fabrizio Malvaldi. 2020. "Electrical Damping Assessment and Sensitivity Analysis of a Liquefied Natural Gas Plant: Experimental Validation." Energies 13, no. 16: 4084.
Battery models have gained great importance in recent years, thanks to the increasingly massive penetration of electric vehicles in the transport market. Accurate battery models are needed to evaluate battery performances and design an efficient battery management system. Different modeling approaches are available in literature, each one with its own advantages and disadvantages. In general, more complex models give accurate results, at the cost of higher computational efforts and time-consuming and costly laboratory testing for parametrization. For these reasons, for early stage evaluation and design of battery management systems, models with simple parameter identification procedures are the most appropriate and feasible solutions. In this article, three different battery modeling approaches are considered, and their parameters' identification are described. Two of the chosen models require no laboratory tests for parametrization, and most of the information are derived from the manufacturer’s datasheet, while the last battery model requires some laboratory assessments. The models are then validated at steady state, comparing the simulation results with the datasheet discharge curves, and in transient operation, comparing the simulation results with experimental results. The three modeling and parametrization approaches are systematically applied to the LG 18650HG2 lithium-ion cell, and results are presented, compared and discussed.
Nicola Campagna; Vincenzo Castiglia; Rosario Miceli; Rosa Anna Mastromauro; Ciro Spataro; Marco Trapanese; Fabio Viola. Battery Models for Battery Powered Applications: A Comparative Study. Energies 2020, 13, 4085 .
AMA StyleNicola Campagna, Vincenzo Castiglia, Rosario Miceli, Rosa Anna Mastromauro, Ciro Spataro, Marco Trapanese, Fabio Viola. Battery Models for Battery Powered Applications: A Comparative Study. Energies. 2020; 13 (16):4085.
Chicago/Turabian StyleNicola Campagna; Vincenzo Castiglia; Rosario Miceli; Rosa Anna Mastromauro; Ciro Spataro; Marco Trapanese; Fabio Viola. 2020. "Battery Models for Battery Powered Applications: A Comparative Study." Energies 13, no. 16: 4085.
Synchronization and islanding detection represent some of the main issues for grid-connected photovoltaic systems (PVSs). The synchronization technique allows to achieve PVS high power factor operation and it provides grid voltage monitoring. The islanding detection control function ensures safe operation of the PVS. Focusing on low-power single-stage PVSs, in this study the most adopted and the highest performance synchronization and islanding detection methods are discussed. The role of the synchronization system is fundamental to detect the grid conditions, for the islanding detection purpose, and to manage the reconnection to the grid after a PVS trip. Hence a combined review is advantageous.
Rosa Anna Mastromauro. Grid Synchronization and Islanding Detection Methods for Single-Stage Photovoltaic Systems. Energies 2020, 13, 3382 .
AMA StyleRosa Anna Mastromauro. Grid Synchronization and Islanding Detection Methods for Single-Stage Photovoltaic Systems. Energies. 2020; 13 (13):3382.
Chicago/Turabian StyleRosa Anna Mastromauro. 2020. "Grid Synchronization and Islanding Detection Methods for Single-Stage Photovoltaic Systems." Energies 13, no. 13: 3382.
In recent years, the Oil & Gas industry has been subjected to a progressive electrification process aiming to comply with global environmental requirements on CO2 emissions reduction. High-power electric motors fed by Variable Frequency Drives (VFDs) have replaced gas turbines as drivers for gas compression applications. In Liquefied Natural Gas (LNG) plants, unexpected downturns could be experienced in case of high torsional vibrations of power generations units. These torsional vibrations derive from the interaction among turbine-generator (TG) units and VFDs and are known as Sub-Synchronous Torsional Interactions (SSTIs). SSTIs can lead to instability when the overall electromechanical system lacks sufficient damping. In this scenario, electrical damping assessment is fundamental in order to ensure stability and reliable operation of an LNG plant. Negative electrical damping is strictly related to the negative incremental resistance behavior of the power converters and it is influenced by the converter’s control system. In this paper, a real case study based on Thyristor Variable Frequency Drives (TVFDs) is considered. Ad hoc dynamic models of the power converters and of the TG unit are developed and combined in order to provide an accurate estimation of the electrical damping. It is demonstrated that the electrical damping is affected by variations of the main control system parameters and how the use of a simplified model instead of an ad hoc model can impact the stability evaluation.
Lorenzo Bongini; Rosa Anna Mastromauro; Daniele Sgrò; Fabrizio Malvaldi. Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant. Energies 2020, 13, 2612 .
AMA StyleLorenzo Bongini, Rosa Anna Mastromauro, Daniele Sgrò, Fabrizio Malvaldi. Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant. Energies. 2020; 13 (10):2612.
Chicago/Turabian StyleLorenzo Bongini; Rosa Anna Mastromauro; Daniele Sgrò; Fabrizio Malvaldi. 2020. "Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant." Energies 13, no. 10: 2612.
Power electronics-based three-stage smart transformers (ST) can be seriously damaged by inrush currents and overvoltages during the start-up phase if the control of the stages is not correctly coordinated. Hence, it is crucial to design properly the start-up procedure, especially in case of modular architectures with distributed DC-links. The design of the start-up procedure depends on the ST power stages topologies, their control systems and the operation modes. This work proposes a soft-shift start modulation technique that allows to limit the inrush current in the DC/DC isolation stage during the DC-link capacitors pre-charging. A fast voltage balancing control, performed by the DC/DC isolation stage, is introduced to avoid overvoltages and unbalanced voltage conditions among the different power cells. Under the proposed method, fast control dynamics is guaranteed thanks to the high frequency bandwidth of the DC/DC isolation stage converters. Theoretical analysis, based on a detailed small signal model of the ST, and simulations are used to demonstrate the principle of the operation. Experimental results, carried out in a ST prototype, confirm the performances of proposed solution in realizing a smooth start-up without voltage/current overshoots.
Sante Pugliese; Giampaolo Buticchi; Rosa Anna Mastromauro; Markus Andresen; Marco Liserre; Silvio Stasi. Soft-Start Procedure for a Three-Stage Smart Transformer Based on Dual-Active Bridge and Cascaded H-Bridge Converters. IEEE Transactions on Power Electronics 2020, 35, 11039 -11052.
AMA StyleSante Pugliese, Giampaolo Buticchi, Rosa Anna Mastromauro, Markus Andresen, Marco Liserre, Silvio Stasi. Soft-Start Procedure for a Three-Stage Smart Transformer Based on Dual-Active Bridge and Cascaded H-Bridge Converters. IEEE Transactions on Power Electronics. 2020; 35 (10):11039-11052.
Chicago/Turabian StyleSante Pugliese; Giampaolo Buticchi; Rosa Anna Mastromauro; Markus Andresen; Marco Liserre; Silvio Stasi. 2020. "Soft-Start Procedure for a Three-Stage Smart Transformer Based on Dual-Active Bridge and Cascaded H-Bridge Converters." IEEE Transactions on Power Electronics 35, no. 10: 11039-11052.
DC Smart Grids represent an alternative to traditional AC power distribution systems. The power conversion stage, interfacing the AC and the DC distribution systems, is the enabling technology to manage multiple DC loads and sources. The three-stage Smart Transformer (ST) is a promising solution, because it includes a DC/DC power conversion stage providing a DC Multibus in output. The modular ST architecture supplies several DC outputs, which allow interfacing a DC Smart Grid with the AC power system. In this paper, the three-stage ST is based on a Cascaded H-Bridge (CHB) converter for the AC/DC power conversion, whereas Dual Active Bridge (DAB) converters are adopted for the DC/DC power conversion stage. The peculiarity is that the DC voltage balancing is performed by the DC/DC power conversion stage instead of the CHB converter. It is advantageous for DC Smart Grids applications where the power sharing among the DC sources and loads is often not balanced. The design of the entire control system is based on the detailed small signal model of the AC/DC and DC/DC power conversion stages of the ST. High dynamic performance of the voltage balancing is fulfilled due to the commonly high switching frequency of the DAB converters.
Sante Pugliese; Markus Andresen; Rosa Anna Mastromauro; Giampaolo Buticchi; Silvio Stasi; Marco Liserre. A New Voltage Balancing Technique for a Three-Stage Modular Smart Transformer Interfacing a DC Multibus. IEEE Transactions on Power Electronics 2018, 34, 2829 -2840.
AMA StyleSante Pugliese, Markus Andresen, Rosa Anna Mastromauro, Giampaolo Buticchi, Silvio Stasi, Marco Liserre. A New Voltage Balancing Technique for a Three-Stage Modular Smart Transformer Interfacing a DC Multibus. IEEE Transactions on Power Electronics. 2018; 34 (3):2829-2840.
Chicago/Turabian StyleSante Pugliese; Markus Andresen; Rosa Anna Mastromauro; Giampaolo Buticchi; Silvio Stasi; Marco Liserre. 2018. "A New Voltage Balancing Technique for a Three-Stage Modular Smart Transformer Interfacing a DC Multibus." IEEE Transactions on Power Electronics 34, no. 3: 2829-2840.
Reactive power handling by distributed power generation systems (DPGS) was prevented in the past in order to avoid additional power losses in the distribution feeders, however several new national grid codes request reactive power generation/absorption by the converters of active users. Actually almost no literature is focused on power losses analysis in case of reactive current circulation from the DPGS converter point of view. In the reactive power management, it has to be considered that the amount of the power losses varies on basis of the converter topology and the related modulation strategy. In this paper an accurate power losses evaluation is provided in case of two-levels and three-levels single-phase PWM inverters in grid-connected operation. The H-Bridge converter and the Neutral Point Clamped (NPC) half-bridge converter are compared. Reactive power handling feasibility is demonstrated up to low power factors (leading and lagging) involving a very limited increase of the power losses.
F. Gervasio; Rosa Anna Mastromauro; M. Liserre. Power losses analysis of two-levels and three-levels PWM inverters handling reactive power. 2015 IEEE International Conference on Industrial Technology (ICIT) 2015, 1123 -1128.
AMA StyleF. Gervasio, Rosa Anna Mastromauro, M. Liserre. Power losses analysis of two-levels and three-levels PWM inverters handling reactive power. 2015 IEEE International Conference on Industrial Technology (ICIT). 2015; ():1123-1128.
Chicago/Turabian StyleF. Gervasio; Rosa Anna Mastromauro; M. Liserre. 2015. "Power losses analysis of two-levels and three-levels PWM inverters handling reactive power." 2015 IEEE International Conference on Industrial Technology (ICIT) , no. : 1123-1128.
A combined centralized/decentralized reactive power control strategy for PV systems connected to LV distribution networks is discussed in the present paper. The proposed solution is based on a centralized control performed by the Distribution System Operator (DSO) coordinated with a local/decentralized control operated at the PV converter level. The proposed strategy ensures high performance in terms of proper voltage regulation both in the overall network (considering the voltage in every node) and locally (controlling the voltage at the point of common coupling of every PV system). The presented method aims to provide a viable solution towards the fulfillment of a real DG integration into the distribution network and the achievement of a LV "active" network. A radial distribution topology, commonly used in LV networks, is selected to evaluate the proposed strategy. Results are also included in the paper.
A. Molina Garcia; Rosa Anna Mastromauro; M. Liserre. A combined centralized/decentralized voltage regulation method for PV inverters in LV distribution networks. 2014 IEEE PES General Meeting | Conference & Exposition 2014, 1 -5.
AMA StyleA. Molina Garcia, Rosa Anna Mastromauro, M. Liserre. A combined centralized/decentralized voltage regulation method for PV inverters in LV distribution networks. 2014 IEEE PES General Meeting | Conference & Exposition. 2014; ():1-5.
Chicago/Turabian StyleA. Molina Garcia; Rosa Anna Mastromauro; M. Liserre. 2014. "A combined centralized/decentralized voltage regulation method for PV inverters in LV distribution networks." 2014 IEEE PES General Meeting | Conference & Exposition , no. : 1-5.
In the More-Electric-Aircrafts the role of the power converters is fundamental and in the last years the amount of electric power has increased rapidly. In this paper a power conversion stage is proposed and controlled for the Ground Power Unit of a More-Electric-Aircraft. The power conversion topology is based on paralleled converters with interleaved modulation which allows to overcome constraints due to low ratio between the switching frequency and the fundamental frequency (400 Hz) and to minimize the size of the filtering elements. Simulation results prove the effectiveness of the proposed solution.
Rosa Anna Mastromauro; S. Stasi; F. Gervasio; M. Liserre; Mastromauro R.A.; Stasi S.; Liserre M.. A ground power unit based on paralleled interleaved inverters for a More-Electric-Aircraft. 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion 2014, 216 -221.
AMA StyleRosa Anna Mastromauro, S. Stasi, F. Gervasio, M. Liserre, Mastromauro R.A., Stasi S., Liserre M.. A ground power unit based on paralleled interleaved inverters for a More-Electric-Aircraft. 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion. 2014; ():216-221.
Chicago/Turabian StyleRosa Anna Mastromauro; S. Stasi; F. Gervasio; M. Liserre; Mastromauro R.A.; Stasi S.; Liserre M.. 2014. "A ground power unit based on paralleled interleaved inverters for a More-Electric-Aircraft." 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion , no. : 216-221.
Marco Liserre; Rosa Anna Mastromauro; Antonella Nagliero. Universal Operation of Small/Medium-Sized Renewable Energy Systems. Power Electronics for Renewable Energy Systems, Transportation and Industrial Applications 2014, 231 -269.
AMA StyleMarco Liserre, Rosa Anna Mastromauro, Antonella Nagliero. Universal Operation of Small/Medium-Sized Renewable Energy Systems. Power Electronics for Renewable Energy Systems, Transportation and Industrial Applications. 2014; ():231-269.
Chicago/Turabian StyleMarco Liserre; Rosa Anna Mastromauro; Antonella Nagliero. 2014. "Universal Operation of Small/Medium-Sized Renewable Energy Systems." Power Electronics for Renewable Energy Systems, Transportation and Industrial Applications , no. : 231-269.
Rosa Anna Mastromauro. Voltage control of a grid-forming converter for an AC microgrid: a real case study. 3rd Renewable Power Generation Conference (RPG 2014) 2014, 3 -3.
AMA StyleRosa Anna Mastromauro. Voltage control of a grid-forming converter for an AC microgrid: a real case study. 3rd Renewable Power Generation Conference (RPG 2014). 2014; ():3-3.
Chicago/Turabian StyleRosa Anna Mastromauro. 2014. "Voltage control of a grid-forming converter for an AC microgrid: a real case study." 3rd Renewable Power Generation Conference (RPG 2014) , no. : 3-3.
In the field of wind energy generation particular interest has been focused in recent years on distributed generation through small wind-turbines (power unit 200 kW) because of their limited size and lower environmental impact. The field of small generation was dominated by the use of asynchronous generators directly connected to the grid, while recently permanent magnet synchronous generators (PMSG) with power converter, either partially or fully controlled, became popular. This paper reviews the control issues related to these small wind-turbine systems: generator torque control, speed/position estimation, pitch control, braking chopper control, dc/dc converter control, and grid converter control. Specific issues for small wind-turbines arise in the wind energy extraction optimization and limitation and in the innovative concept of “universal” wind-turbine operation, that leads these system to operate grid-connected, standalone or in load supporting mode.
Natalia Angela Orlando; Marco Liserre; Rosa Anna Mastromauro; Antonio Dell'Aquila. A Survey of Control Issues in PMSG-Based Small Wind-Turbine Systems. IEEE Transactions on Industrial Informatics 2013, 9, 1211 -1221.
AMA StyleNatalia Angela Orlando, Marco Liserre, Rosa Anna Mastromauro, Antonio Dell'Aquila. A Survey of Control Issues in PMSG-Based Small Wind-Turbine Systems. IEEE Transactions on Industrial Informatics. 2013; 9 (3):1211-1221.
Chicago/Turabian StyleNatalia Angela Orlando; Marco Liserre; Rosa Anna Mastromauro; Antonio Dell'Aquila. 2013. "A Survey of Control Issues in PMSG-Based Small Wind-Turbine Systems." IEEE Transactions on Industrial Informatics 9, no. 3: 1211-1221.
Reactive power handling capability is requested to distributed power generation systems by the new national grid codes. The reactive power exchange should be maintained inside a triangular/rectangular reactive power capability curve. Among distributed power generation systems based on renewable sources, small wind turbines systems are becoming an increasingly attractive structure for the proposal of an active low voltage (LV) distribution network. A hierarchical control applied to a small wind turbine system, and enabling a real integration into the distribution network, is proposed in this paper. It consists of: a local control system (primary and secondary level) performed on the back-to-back converter and a remote control system providing the set-points for the local control. The local control system is based on a coordinated active/reactive power control strategy carried out by means of three-levels cascade loops. Simulation results and some selected experimental results validate the effectiveness of the proposed solution.
Rosa Anna Mastromauro; Natalia A. Orlando; Domenico Ricchiuto; Marco Liserre; Antonio Dell'aquila. Hierarchical control of a small wind turbine system for active integration in LV distribution network. 2013 International Conference on Clean Electrical Power (ICCEP) 2013, 426 -433.
AMA StyleRosa Anna Mastromauro, Natalia A. Orlando, Domenico Ricchiuto, Marco Liserre, Antonio Dell'aquila. Hierarchical control of a small wind turbine system for active integration in LV distribution network. 2013 International Conference on Clean Electrical Power (ICCEP). 2013; ():426-433.
Chicago/Turabian StyleRosa Anna Mastromauro; Natalia A. Orlando; Domenico Ricchiuto; Marco Liserre; Antonio Dell'aquila. 2013. "Hierarchical control of a small wind turbine system for active integration in LV distribution network." 2013 International Conference on Clean Electrical Power (ICCEP) , no. : 426-433.
Fast change of the irradiance conditions entails failure of the maximum power point tracking (MPPT) algorithm in a photovoltaic system (PVS). In this paper it is proposed the combination of a modified Perturb and Observe (P&O) distributed MPPT and an adaptive algorithm. The MPPT has been tested in case of hard mismatch conditions through simulation showing high performance in terms of efficiency.
F. Scarpetta; M. Liserre; Rosa Anna Mastromauro. Adaptive distributed MPPT algorithm for photovoltaic systems. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society 2012, 5708 -5713.
AMA StyleF. Scarpetta, M. Liserre, Rosa Anna Mastromauro. Adaptive distributed MPPT algorithm for photovoltaic systems. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. 2012; ():5708-5713.
Chicago/Turabian StyleF. Scarpetta; M. Liserre; Rosa Anna Mastromauro. 2012. "Adaptive distributed MPPT algorithm for photovoltaic systems." IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , no. : 5708-5713.
This paper is focused on the control of small wind turbines, rated less than 200 kW, in grid-interactive microgrids. The considered system is based on a back-to-back power conversion stage. The management of the active and reactive power exchange in the different operating conditions is the key point to allow a practical integration of wind turbine systems in the main electrical grid. This issue lies in a proper control system design achieving high performance in grid-connection as in stand-alone operation modes. A cascade control loops structure is proposed in the paper. Some simulation and experimental results validate the control algorithm.
Natalia A. Orlando; Antonella Nagliero; Rosa Anna Mastromauro; Marco Liserre; Antonio Dell'aquila. Small wind turbines in grid-interactive microgrids. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society 2012, 1156 -1161.
AMA StyleNatalia A. Orlando, Antonella Nagliero, Rosa Anna Mastromauro, Marco Liserre, Antonio Dell'aquila. Small wind turbines in grid-interactive microgrids. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. 2012; ():1156-1161.
Chicago/Turabian StyleNatalia A. Orlando; Antonella Nagliero; Rosa Anna Mastromauro; Marco Liserre; Antonio Dell'aquila. 2012. "Small wind turbines in grid-interactive microgrids." IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , no. : 1156-1161.
Transformer-less photovoltaic (PV) inverters specifically designed to achieve high efficiency shall also comply with leakage current limits, low current harmonic distortion and reactive power handling capability. This paper aims at benchmarking some recently published or patented topologies with the most successful industrial products and it offers a complete trends scenario and a critical comparison. The performances are evaluated in terms of efficiency, common-mode voltage, leakage current, power quality, reactive power handling capability, size of the grid filter and power converter rating.
M. C. Poliseno; Rosa Anna Mastromauro; M. Liserre. Transformer-less photovoltaic (PV) inverters: A critical comparison. 2012 IEEE Energy Conversion Congress and Exposition (ECCE) 2012, 3438 -3445.
AMA StyleM. C. Poliseno, Rosa Anna Mastromauro, M. Liserre. Transformer-less photovoltaic (PV) inverters: A critical comparison. 2012 IEEE Energy Conversion Congress and Exposition (ECCE). 2012; ():3438-3445.
Chicago/Turabian StyleM. C. Poliseno; Rosa Anna Mastromauro; M. Liserre. 2012. "Transformer-less photovoltaic (PV) inverters: A critical comparison." 2012 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 3438-3445.
Transformer-less photovoltaic (PV) inverters offer better efficiency compared to inverters connected to the grid through a transformer providing galvanic isolation. However, in case the transformer is omitted, the generated common-mode voltage greatly influences the leakage current flowing to ground through the parasitic capacitance of the PV array. Hence, both the power stage and the modulation strategy of the converter, shall be properly designed to avoid leakage current while guaranteeing high efficiency and reactive power handling capability that are requested by national grid codes. In this paper, three single phase transformer-less inverter topologies are analyzed: the Highly Efficient and Reliable Inverter Concept converter (HERIC), a recently published topology based on a combination of step-down converters and a recently patented modification of the Neutral Point Clamped converter (NPC) optimized for MOSFET use. Simulation results are used to show: current waveform, reactive power handling capability, efficiency and produced common-mode voltage.
M. C. Poliseno; Rosa Anna Mastromauro; M. Liserre; A. Dell'aquila. High efficiency transformerless PV power converters. International Symposium on Power Electronics Power Electronics, Electrical Drives, Automation and Motion 2012, 93 -98.
AMA StyleM. C. Poliseno, Rosa Anna Mastromauro, M. Liserre, A. Dell'aquila. High efficiency transformerless PV power converters. International Symposium on Power Electronics Power Electronics, Electrical Drives, Automation and Motion. 2012; ():93-98.
Chicago/Turabian StyleM. C. Poliseno; Rosa Anna Mastromauro; M. Liserre; A. Dell'aquila. 2012. "High efficiency transformerless PV power converters." International Symposium on Power Electronics Power Electronics, Electrical Drives, Automation and Motion , no. : 93-98.
This paper deals with a small wind turbine system (WTS) constituted by a permanent magnet synchronous generator (PMSG) connected to the grid via a back-to-back converter. The Low Voltage Ride through (LVRT) requirements for the WTS are described and the nonlinear dynamics of a grid-side converter is analyzed in the presence of voltage sags. The study shows that new chaotic phenomena are generated when the size of the dc-link capacitor is reduced. The reported time waveforms and state-space attractors clearly highlight that the system becomes chaotic during the voltage sag, being stable before and after the occurrence of the disturbance. Finally, the chaotic behavior is validated via the 0-1 test for chaos, thus confirming the novel phenomenon described herein.
Natalia A. Orlando; Rosa Anna Mastromauro; Marco Liserre; Donato Cafagna; Giuseppe Grassi. New chaotic phenomena occurring during voltage sags in small wind turbine systems based on back-to-back converters. 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG) 2012, 505 -512.
AMA StyleNatalia A. Orlando, Rosa Anna Mastromauro, Marco Liserre, Donato Cafagna, Giuseppe Grassi. New chaotic phenomena occurring during voltage sags in small wind turbine systems based on back-to-back converters. 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). 2012; ():505-512.
Chicago/Turabian StyleNatalia A. Orlando; Rosa Anna Mastromauro; Marco Liserre; Donato Cafagna; Giuseppe Grassi. 2012. "New chaotic phenomena occurring during voltage sags in small wind turbine systems based on back-to-back converters." 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG) , no. : 505-512.