Browsing by Author "Ormaetxea, Enekoitz"
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Item A fault tolerant space vector modulation strategy for matrix converters(2009) Ibarra, Edorta; Andreu, Jon; Kortabarria, Iñigo; Ormaetxea, Enekoitz; Robles, Eider; RENOVABLES OFFSHOREThe topology of the Matrix Converter (MC) is promising because of its intrinsic advantages. Nevertheless, the MC is not as robust as other converters and therefore, under certain fault situations, the converter may be damaged. Certain applications of the MC, such as aeronautics, submarines, etc. require fault tolerant strategies that guarantee the continuous operation of the system under fault conditions. This article examines, in the first place, the behavior of the MC when it is protected by the clamp circuit and one of its switches is in open circuit due to a fault. In order to improve the fault tolerance of the MC, three SVM modulation variations are proposed. On the one hand, two of these variations guarantee the safety of the converter, but the THD of the synthesized voltages and currents is high. On the other hand, the third strategy enhances these and ensures the control of a PMSM in a fault situation.Item FPGA based real time simulation of a Matrix Converter(2010) Ormaetxea, Enekoitz; Ibarra, Edorta; Andreu, Jon; Kortabarria, Inigo; Santosy, Maider; POWER SYSTEMSRecently, Matrix Converter (MC) has attracted the interest of the scientific community. Due to the complexity of its control, simulation of this converter is a time consuming task. In this work, an FPGA based MC model is presented, allowing the simulation of a detailed MC in real-time.Item FPGA-based generalized scalar pulse-width-modulation for matrix converters(Institution of Engineering and Technology, 2010) Bradaschia, Fabrício; Ormaetxea, Enekoitz; Andreu, Jon; Cavalcanti, Marcelo C.; Apiñaniz, Susana; POWER ELECTRONICS AND SYSTEM EQUIPMENTThis paper presents an entire FPGA implementation of a modulation technique for matrix converter known as Double-Sided Generalized Scalar Pulse Width Modulation. The main advantage of this technique is the possibility to emulate the behaviour of many modulation techniques, including the well-known Space Vector Modulation. Due to the absence of complex algebraic and trigonometric operations in the generalized modulation technique, it is possible to implement the entire control system of the matrix converter in a single FPGA chip. Simulations and experimental results show the effectiveness of the implementation.Item Implementation of an electrical micro-grid through matrix converters connected in parallel(2010) Planas, Estefanía; Ibarra, Edorta; Ormaetxea, Enekoitz; Andreu, Jon; Gabiolay, Igor; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe matrix converter (MC) arouses a growing interest because it provides many advantages. On the other hand, the association of these converters in parallel makes the operation of the system operation more reliable and offers the possibility of creating electrical micro-grids. This article presents a parallel association of MCs by droop parallelization technique, which allows the control of several parallel MCs without needing communication between them. This configuration also offers the possibility to achieve an even load sharing. The obtained results demonstrate the feasibility of this technique.Item New fault tolerant matrix converter(2011-02) Ibarra, Edorta; Andreu, Jon; Kortabarria, Iñigo; Ormaetxea, Enekoitz; De Alegría, Iñigo Martínez; Martín, José Luís; Ibañez, Pedro; SGThe matrix converter (MC) presents a promising topology that will have to overcome certain barriers (protection systems, durability, the development of converters for real applications, etc.) in order to gain a foothold in the industry. In some applications, where continuous operation must be insured in the case of a system failure, improved reliability of the converter is of particular importance. In this sense, this article focuses on the study of a fault tolerant MC. The fault tolerance of a converter is characterized by its total or partial response in the case of a breakage of any of its components. Taking into consideration that virtually no work has been done on fault tolerant MCs, this paper describes the most important studies in this area. Moreover, a new method is proposed for detecting the breakage of MC semiconductors. Likewise, a new variation of SVM modulation with failure tolerance capacity is presented. This guarantees the continuous operation of the converter and the pseudo-optimum control of a PMSM. This paper also proposes a novel MC topology, which allows the flexible reconfiguration of this converter, when one or several of its semiconductors are damaged. In this way, the MC can continue operating at 100% of its performance without having to double its resources. In this way, it can be said that the solution described in this article represents a step forward towards the development of reliable matrix converters for real applications.Item A step forward towards the development of reliable matrix converters(2012-01) Andreu, Jon; Kortabarria, Iñigo; Ormaetxea, Enekoitz; Ibarra, Edorta; Martin, José Luís; Apiñaniz, Susana; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe matrix converter can be used in a wide range of applications. Nevertheless, it does not yet represent a sufficiently mature option for industrialization. In order to resolve this problem, this paper examines the hardware of the matrix converter and identifies all the circuits that should be included in this. It also quantifies the operating conditions and provides practical guidelines for the step-by-step design of a matrix converter. These considerations are validated with experimental results. In this way, it can be said that this paper represents a step forward toward the development of reliable matrix converters for real applications.