Browsing by Keyword "Matrix converter"
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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 solution for matrix converter double sided space vector modulation algorithm(2008-01) Andreu, J.; Bidarte, U.; Astarloa, A.; De Alegria, I. Martinez; Ibanez, P.; SGMatrix Converters (MCs) present several advantages, but yet several barriers must be overcome, such as MC modulation and control technique complexity. This article proposes a multiplatform environment that allows the implementation of the Double Sided Space Vector Modulation (DS-SVM) algorithm in a last-generation Field Programmable Gate Array (FPGA) device. The traditional digital control architecture, based on a SP and some additional devices, is improved by means of a last generation FPGA where the main processor (PowerPC), internal memory, communication interfaces, I/O capabilities and a hardware core that executes the DS-SVM have been connected using on-chip buses. The methodology begins by defining the DS-SVM in a Matlab-Simulink environment. The PowerPC delivers 680 MIPS, but it is not a good candidate to execute the DS-SVM algorithm because it is not possible to achieve the modulation frequency that is necessary for an MC. A new configurable hardware circuit that implements the whole DS-SVM algorithm is proposed. This solution achieves modulation frequencies over 100 kHz. This hardware core is connected to one of the PowerPC buses and the processor can configure it or get feedback information at any time. As the processor is liberated from the very time-consuming DS-SVM computation, it can execute many higher level tasks.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 A matrix converter control embedded in a single system on chip based on a FPGA(2010) Ormaetxea, E.; Andreu, J.; Kortabarria, I.; Martínez De Alegría, I.; Robles, E.; RENOVABLES OFFSHOREThe matrix converter (MC) presents a promising topology that needs to overcome certain barriers (complexity of the modulation and control techniques, protection systems, etc.) in order to gain a foothold in the industry. This article deals with the implementation of the DS SVM vector modulation, commutation and protection of the MC through a series of hardware blocks (cores) integrally implemented in an FPGA. Likewise, given that all the processing capabilities have been integrated in a single chip, it can be said that an FPGA-based System on a Chip (SoC) has been designed.Item Matrix converter: Improvement on the start-up and the switching behavior(2008) Andreu, Jon; De Diego, José Miguel; De Alegría, Iñigo Martínez; Kortabarria, Iñigo; Martín, José Luis; Ceballos, Salvador; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe matrix converter (MC) presents a promising topology that needs to overcome certain barriers (protection systems, durability, the development of converters for real applications, etc.) in order to gain a foothold in the market. Taking into consideration that the great majority of efforts are being oriented towards control algorithms and modulation, this article focuses on MC hardware. In order to improve the switching speed of the MC and thus obtain signals with less harmonic distortion, several different IGBT excitation circuits are being studied. Below, the appropriate topology is selected for the MC and a configuration is presented which reduces the excursion range of the drivers and optimizes the switching speed of the IGBTs. Inadequate driver control can lead to the destruction of the MC due to its low ride-through capability. Moreover, this converter is specially sensitive during start-up, as at that moment there are high overcurrents and overvoltages. With the aim of finding a solution for starting-up the MC, a circuit is presented (separate from the control software) which ensures a correct sequencing of supplies, thus avoiding a short-circuit between input phases. Moreover, it detects overcurrent, connection/disconnection, and converter supply faults. Faults cause the circuit to protect the MC by switching off all the IGBT drivers without latency. All this operability is guaranteed even when the supply falls below the threshold specified by the manufacturers for the correct operation of the circuits. All these features are demonstrated with experimental results. For all these reasons, it can be said that the techniques proposed in this article substantially improve the MC start-up cycle, representing a step forward towards the development of reliable matrix converters for real applications.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 Sequencing of supplies of the matrix converter: Improvement of the start-up and MC interaction with the filter and clamp circuit(2008) Andreu, J.; De Diego, J. M.; De Alegria, I. M.; Kortabarria, I.; Martín, J. L.; Ceballos, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe matrix converter (MC) presents a promising topology that needs to overcome certain barriers (protection systems, durability, the development of converters for real applications, etc.) in order to gain a foothold in the market. This article focuses on MC hardware. In order to improve the switching speed of the MC and thus obtain signals with less harmonic distortion, the appropriate driver topology is selected. Inadequate driver control can lead to the destruction of the MC. Moreover, this converter is specially sensitive during start-up, as at that moment there are high overcurrents and overvoltages. With the aim of finding a solution for starting-up the MC, a circuit is presented which ensures a correct sequencing of supplies, thus avoiding a short-circuit between input phases. Furthermore, it detects overcurrent, connection/disconnection, and converter supply faults. Faults cause the circuit to protect the MC by switching off all the IGBT drivers without latency. Lastly, an analysis is made of the interaction that takes place during the start-up of the MC between the input filter, clamp circuit and the converter. A variation of the clamp circuit strategy is presented which minimizes the overcurrents that circulate through the converter. For all these reasons, it can be said that the techniques described in this article substantially improve the MC start-up cycle, representing a step forward towards the development of reliable matrix converters for real applications.