Technological Institute of Superior Studies of Irapuato ITESI

Irapuato, Mexico

Technological Institute of Superior Studies of Irapuato ITESI

Irapuato, Mexico
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Escobar G.,ABB | Martinez-Montejano M.F.,Autonomous University of San Luis Potosi | Valdez A.A.,Technological Institute of Superior Studies of Irapuato ITESI | Martinez P.R.,Technological Institute of Superior Studies of Irapuato ITESI | Hernandez-Gomez M.,French National Center for Scientific Research
IEEE Transactions on Industrial Electronics | Year: 2011

This paper presents a grid synchronization scheme aimed to provide an estimation of the angular frequency and both the positive and negative sequences of the fundamental component of an unbalanced three-phase signal. These sequences are provided in fixed-reference-frame coordinates, and thus, the proposed algorithm is referred to as fixed-reference-frame phase-locked loop (PLL) (FRF-PLL). In fact, the FRF-PLL does not require transformation of variables into the synchronous frame coordinates as in most PLL schemes. Therefore, the proposed scheme is not based on the phase angle detection. Instead, the angular frequency is detected and used for synchronization purposes. The design of the FRF-PLL is based on a complete description of the source voltage involving both positive and negative sequences in stationary coordinates and considering the angular frequency as an uncertain parameter. Therefore, the FRF-PLL is intended to perform properly under severe unbalanced conditions and to be robust against angular frequency variations, sags, and swells in the three-phase utility voltage signal. Due to the selective nature of the scheme, it shows certain capability to alleviate the effect of harmonic distortion that is present in the utility voltage signal. © 2010 IEEE.


Martinez-Rodriguez P.R.,Technological Institute of Superior Studies of Irapuato ITESI | Escobar G.,Autonomous University of Yucatán | Valdez-Fernandez A.A.,Autonomous University of San Luis Potosi | Hernandez-Gomez M.,Technological Institute of Superior Studies of Irapuato ITESI | Sosa J.M.,Technological Institute of Superior Studies of Irapuato ITESI
IEEE Transactions on Industrial Electronics | Year: 2014

This paper presents a model-based controller for the direct control of real and reactive powers in a three-phase three-wire rectifier. As the unbalanced operation is considered, it is convenient to express the grid voltage in terms of both positive and negative sequences, in order to obtain a more complete description of the system. In particular, the positive sequence of the grid voltage is used as the transformation basis to reconstruct the average, i.e., a particular subset, of the conventional power definition. Based on this transformation, the regulation of the average of both real and reactive powers is possible without deformation of the grid current. The proposed controller also incorporates an adaptation mechanism to cope with parameter uncertainties. For comparison purposes, a conventional controller based on the complete definition of the instantaneous powers is also presented. Experimental results are provided to assess the performance of the proposed positive-sequence-based solution and compared with those obtained using a conventional controller. © 1982-2012 IEEE.


Valdez-Fernandez A.A.,Autonomous University of San Luis Potosi | Martinez-Rodriguez P.R.,Technological Institute of Superior Studies of Irapuato ITESI | Escobar G.,Autonomous University of Yucatán | Limones-Pozos C.A.,Technological Institute of Superior Studies of Irapuato ITESI | Sosa J.M.,Technological Institute of Superior Studies of Irapuato ITESI
IEEE Transactions on Industrial Electronics | Year: 2013

This paper presents the modeling and control processes of the single-phase cascade H-bridge multilevel converter used as a shunt active filter. Based on the obtained model, a controller is proposed to compensate for harmonic distortion and reactive power caused by a nonlinear load. These issues are solved by guaranteeing tracking of the line current toward an appropriately defined current reference. In the proposed approach, the current reference has been selected to be a signal proportional to either the line voltage or to its fundamental component; however, the proposed method can also be extended to other reference definitions. The proposed controller also includes voltage loops to guarantee regulation and balance of the involved capacitor voltages toward constant references. Experimental results on a 2-kVA prototype are presented to assess the performance of the proposed controller. © 1982-2012 IEEE.


Escobar G.,Autonomous University of Yucatán | Mattavelli P.,Virginia Polytechnic Institute and State University | Hernandez-Gomez M.,Toshiba Corporation | Martinez-Rodriguez P.R.,Technological Institute of Superior Studies of Irapuato ITESI
IEEE Transactions on Industrial Electronics | Year: 2014

This paper proposes some modifications aimed for the practical implementation of repetitive-based schemes used in harmonic distortion compensation schemes. Practical implementation of repetitive schemes requires both to limit the gain originally infinite and to restrict the bandwidth of the controller originally of infinite dimension. Roughly speaking, each delay line in the repetitive scheme must include an associated limiting gain and a low-pass filter (LPF). However, it has been observed that this practical modifications can produce a considerable phase shift at the frequencies of interest. As a consequence, the compensation of harmonics cannot be guaranteed anymore. One possibility to compensate such a phase shift deterioration consists in modifying the delay time associated to the delay line of the repetitive scheme. However, in the case of conventional LPFs, this phase shift is usually a nonlinear function of the frequency, which makes this task extremely difficult if not impossible. To overcome this issue, this paper proposes the use of low-pass finite impulse response filters, whose phase shift can be made linear by following appropriate design rules. The idea behind this approach is that an LPF with a linear phase produces a constant delay time, which is much easier to compensate in the delay line. Experimental results are presented to confirm the benefits of the proposed scheme. © 1982-2012 IEEE.


Sosa J.M.,Technological Institute of Superior Studies of Irapuato ITESI | Martinez-Rodriguez P.R.,Technological Institute of Superior Studies of Irapuato ITESI | Vazquez G.,Technological Institute of Superior Studies of Irapuato ITESI
Asian Journal of Control | Year: 2015

This paper presents an elementary result on the uniform stability of an equilibrium point for a class of autonomous systems that have an exponentially decreasing factor in their dynamics. The mapping that defines the dynamics may be not Lipschitz so uniqueness of solutions is not assured. Such a class of systems may arise in the stability analysis of some closed-loop control systems, as is the case that leads to this problem, namely, the application of the vertically transverse function approach to the practical point-stabilization of underactuated mechanical systems evolving on Lie groups. ©2014 Chinese Automatic Control Society and Wiley Publishing Asia Pty Ltd.

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