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Vidal J.,Infineon Technologies | Abad G.,University of Mondragon | Arza J.,Ingeteam Technology | Aurtenechea S.,Renewable Energy Systems Area in Ingeteam Technology
IEEE Transactions on Energy Conversion | Year: 2013

This paper presents two new single-phase crowbar protection topologies, for doubly fed induction generator (DFIG) based wind turbines. These crowbar topologies, can be suitable for fulfilling the low voltage ride through (LVRT) requirements demanded by the grid codes, in next generation of high-power DFIG-based wind turbines, allowing the possibility to use simpler and more cost effective crowbar designs, than the classic three-phase dc crowbar, commonly used among manufacturers. Therefore, this paper compares the differences of the classic three-phase dc crowbar and the new proposed ones, together with the study of the behavior of a prototype of 6.25 MW DFIG, when is affected with severe voltage symmetric and asymmetric voltage dips. Control actions and design ideas are discussed, trying to accomplish the LVRT requirements, concluding by means of simulation results that the proposed new single-phase crowbar topologies can be an attractive alternative crowbar solution, for high-power wind turbines. © 2012 IEEE.

Laka A.,University of Mondragon | Barrena J.A.,University of Mondragon | Chivite-Zabalza J.,Ingeteam Technology | Rodriguez M.A.,Ingeteam Technology
IEEE Transactions on Power Delivery | Year: 2013

The demand of power-electronic devices is increasing in several applications, and power-electronic building blocks (PEBBs) are a strategic concept to increase the reliability of the power-electronic converters and to minimize their cost. A possible solution to increase the power rate of these converters is the use of series or parallel connected PEBBs in multipulse configurations. Magnetic elements, such as zig-zag transformers, phase-shifted transformers (pst), or zero-sequence blocking transformers (ZSBT), are used to interconnect the PEBBs. In this paper, the operation of multipulse converters will be analyzed, describing the harmonic cancellation and minimization techniques that could be used in these multipulse converters, focusing on the power-electronics flexible ac transmission systems devices installed at the NYPA Marcy substation. In order to improve the dynamic response of this system, the use of selective harmonic elimination modulation is proposed and implemented. © 1986-2012 IEEE.

Laka A.,University of Mondragon | Barrena J.A.,University of Mondragon | Chivite-Zabalza J.,Ingeteam Technology | Vidal M.A.R.,Ingeteam Technology | Calvo G.,Ingeteam Technology
IEEE Transactions on Energy Conversion | Year: 2013

Zero-sequence blocking transformers (ZSBTs), used to block the zero-sequence components that are present in a three-phase system, are commonly built winding the three phases around the same core limb. They are difficult to construct, especially in high-power applications that use large cross-sectional cables, as they require a symmetrical winding distribution for not to produce any flux for positive- and negative-sequence components. This paper presents a novel ZSBT configuration using three single-phase transformers. Although slightly greater in size, they can be easily wound, even when thick cables are used. Moreover, the proposed topology can be used as a simulation model of any ZSBT configuration, where core losses and magnetic saturation of the core are included by connecting a single inductor to the secondary windings of the transformers. This paper provides full details of the circuit and is supported by simulation and experimental results of the proposed ZSBT. © 1986-2012 IEEE.

Chivite-Zabalza F.J.,Ingeteam Technology | Izurza P.,Ingeteam Technology | Calvo G.,Ingeteam Technology | Rodriguez M.A.,Ingeteam Technology
Proceedings of the 2011 14th European Conference on Power Electronics and Applications, EPE 2011 | Year: 2011

In this paper, a novel technique to balance the voltage of the two split dc capacitors of a 3-Level Neutral-Point-Clamped inverter using triangular carrier PWM modulation is presented. This technique, suitable for reactive power compensation and for inverters operating with a relatively low switching frequency, consists in adding a square wave at six times the output frequency. Subsequently, the paper presents a comparison with two already known strategies in which a sinusoidal waveform at two and six times the output frequency are injected. The current contribution to the mid-point of the dc bus is then analysed for different modulation indexes and operating conditions. Based on this analysis, a small-signal averaged model, suitable for control design purposes is presented. Finally, simulation and experimental results on a 690 V AC, 120 kVA test bench that validate the theory are shown. © 2011 EPE Association - European Power Electr.

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