Juan Manuel Carrasco Solís

Bio: Juan Manuel Carrasco Solís is an academic researcher from University of Seville. The author has contributed to research in topics: AC power & Voltage source. The author has an hindex of 5, co-authored 15 publications receiving 90 citations.

System for using energy stored in the mechanical inertia of the rotor of a wind turbine

Abstract: The invention relates to a system for using the mechanical energy stored in a rotary element in order to contribute to the dynamic stability and frequency control of the network to which said rotary element is connected. The inventive system is primarily intended for use in the field of aerogenerators in which the inertial energy stored in the rotor of said aerogenerators can be used. Said system comprises two back-to-back power converters, a rectifier (4) and an inverter (6) with a control system (16) that generates the transfer torque Topt which ensures optimum energy capture for any wind speed. Said system comprises two additional torque components: the first ΔTf at the output of the control block (20) with the purpose of ensuring that the frequency of the distribution network follows a reference frequency; the second component, comprising a torque generated by the control block (18), performs the gain calculation for torque ΔTi in order to help improve the dynamic stability of the distribution network. In this way, the system is provided with an inertial torque which is similar to the equivalent inertial power of a synchronous generator connected to the distribution network of a standard generating station. As a result, reference torque Tref is obtained which is the torque set point that the rectifier circuit (4) will have to follow so that the electric torque of the generator (3) follows said reference and so that the control objectives are achieved.

System and method for the distributed control and management of a microgrid

Abstract: System and method for the distributed control and management of a microgrid. The system comprises a plurality of intelligent devices (1, 1') in communication through a network (8) with a data model unit (2) for storing global parameters of the microgrid, an input profile generator module (4) and an exchange manager module (6). When a global parameter is updated in a data model unit (2), it is replicated in every data model unit (2). A first set of intelligent devices (1) is associated and in communication with different power devices (3) of the microgrid, the data model units (2) collecting data monitored by the power device (3) and the input profile generator module (4) iteratively calculating an available range of power that the power device (3) can produce or consume. The exchange manager module (6) iteratively calculates power exchanges between different power devices (3) of the microgrid considering the available ranges of power of the power devices (3) and at least one input parameter.

System for conditioning and generating/storing power in electrical distribution networks in order to improve the dynamic stability and frequency control thereof

Abstract: The invention relates to a system for conditioning and generating/storing power in electrical distribution networks in order to improve the dynamic stability and frequency control thereof. The invention comprises a DC/AC converter (1) which is used to connect a power source (14) to the electrical distribution network (13), e. g. a wind energy collection system, and a DC busbar which consists of a group of capacitors (12). A system for storing/generating power, such as batteries or a superconducting coil (11), is connected to said busbar. A power control system (3) is used to measure the currents and voltages of the electrical network, said currents being measured by means of Hall effect measuring sensors (4) and the voltages by means of measuring transformers (5). In this way, the triggers for the power switches are generated and, as a result, the instantaneous active power supplied is the reference power, the set value of which is obtained in the block (7).

A novel space-vector algorithm for multilevel converters based on geometrical considerations using a new sequence control technique

Abstract: This paper presents a fast and simple space vector modulation algorithm for voltage source multilevel converters for calculating the switching times and the space vectors using simple geometrical considerations. This method provides the nearest switching vectors sequence to the reference vector and calculates the on-state durations of the respective switching state vectors without involving trigonometric functions, look-up tables or coordinate system transformations which increase the computational load corresponding to the modulation of a multilevel converter. The low computational cost of the proposed method is always the same and it is independent of the number of levels of the converter. In addition, a new switching sequence control technique is presented for reducing the ripple of the DC-link voltage approximately in 66%.

New space vector modulation algorithms applied to multilevel converters with balanced DC-link voltage

Abstract: This work presents a survey of new space vector modulation algorithms for high power voltage source multilevel converters. These techniques provide the nearest switching vectors sequence to the reference vector and calculates the on-state durations of the respective switching state vectors without involving trigonometric functions, look-up tables or coordinate system transformations which increase the computational load corresponding to the modulation of a multilevel converter. These algorithms drastically reduce the computational load maintained permitting the on-line computation of the switching sequence and the on-state durations of the respective switching state vectors. The onstate durations are reduced to a simple addition. In addition, the low computational cost of the proposed methods is always the same and it is independent of the number of levels of the converter. The algorithms have been satisfactorily implemented in very low-cost microcontrollers.

The age of multilevel converters arrives

Abstract: This work is devoted to review and analyze the most relevant characteristics of multilevel converters, to motivate possible solutions, and to show that we are in a decisive instant in which energy companies have to bet on these converters as a good solution compared with classic two-level converters. This article presents a brief overview of the actual applications of multilevel converters and provides an introduction of the modeling techniques and the most common modulation strategies. It also addresses the operational and technological issues.

Energy Storage Systems for Transport and Grid Applications

Abstract: Energy storage systems (ESSs) are enabling technologies for well-established and new applications such as power peak shaving, electric vehicles, integration of renewable energies, etc. This paper presents a review of ESSs for transport and grid applications, covering several aspects as the storage technology, the main applications, and the power converters used to operate some of the energy storage technologies. Special attention is given to the different applications, providing a deep description of the system and addressing the most suitable storage technology. The main objective of this paper is to introduce the subject and to give an updated reference to nonspecialist, academic, and engineers in the field of power electronics.

Multilevel Converters: An Enabling Technology for High-Power Applications

Abstract: Multilevel converters are considered today as the state-of-the-art power-conversion systems for high-power and power-quality demanding applications. This paper presents a tutorial on this technology, covering the operating principle and the different power circuit topologies, modulation methods, technical issues and industry applications. Special attention is given to established technology already found in industry with more in-depth and self-contained information, while recent advances and state-of-the-art contributions are addressed with useful references. This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.

Multilevel Converters: An Enabling Technology for High-Power Applications Multilevel converters generate voltage and current waveforms of improved quality, that can be used to power drives for trains and other vehicles, and many other applications.

Abstract: Multilevel converters are considered today as the state-of-the-art power-conversion systems for high-power and power-quality demanding applications. This paper presents a tutorialonthistechnology,coveringtheoperatingprincipleand the different power circuit topologies, modulation methods, technical issues and industry applications. Special attention is given to established technology already found in industry with more in-depth and self-contained information, while recent advances and state-of-the-art contributions are addressed with useful references. This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.

Modeling Strategy for Back-to-Back Three-Level Converters Applied to High-Power Wind Turbines

Abstract: Three-level converters are becoming a realistic alternative to the conventional converters in high-power wind-energy applications. In this paper, a complete analytical strategy to model a back-to-back three-level converter is described. This tool permits us to adapt the control strategy to the specific application. Moreover, the model of different loads can be incorporated to the overall model. Both control strategy and load models are included in the complete system model. The proposed model pays special attention to the unbalance in the capacitors' voltage of three-level converters, including the dynamics of the capacitors' voltage. In order to validate the model and the control strategy proposed in this paper, a 3-MW three-level back-to-back power converter used as a power conditioning system of a variable speed wind turbine has been simulated. Finally, the described strategy has been implemented in a 50-kVA scalable prototype as well, providing a satisfactory performance