Papers by Pablo Zumel Vaquero
2015 9th International Conference on Compatibility and Power Electronics (CPE), 2015
Distributed Maximum Power Point Tracking (DMPPT) architectures are one of the most promising solu... more Distributed Maximum Power Point Tracking (DMPPT) architectures are one of the most promising solutions to overcome the drawbacks associated to mismatching phenomena in photovoltaic (PV) applications. In these PV architectures, there is a DC-DC converter dedicated to perform the Maximum Power Point Tracking (MPPT) for each PV panel. In order to have the greatest flexibility, the converter needs to have the ability of voltage step-up and step-down. Other desired specifications for the converters applied in DMPPT architectures are high efficiency and low cost. This paper proposes a new DCDC converter topology for PV applications. Its operating principle, as well as its static characteristics, is analyzed. Moreover, a theoretical efficiency comparison analysis, between the proposed converter and the Non-Inverting Buck-Boost (NIBB) converter, is carried out for a 100 kW solar plant. Three different scenarios are studied, according to different mismatching conditions. In all the scenarios, the proposed converter provides higher efficiency than the NIBB converter.
2010 IEEE 12th Workshop on Control and Modeling for Power Electronics (COMPEL), 2010
This paper is focused on the measurement of a Bode plot of a switching power converter from a sin... more This paper is focused on the measurement of a Bode plot of a switching power converter from a single simulation in the time domain by means of a multisine signal. The proposed procedure allows an important saving in simulation time compared to a single-tone injection approach. It can be especially useful in the case of evaluating power converters with digital
2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2011
In this paper, a simple method to obtain the frequency response of a switching DC/DC converter is... more In this paper, a simple method to obtain the frequency response of a switching DC/DC converter is proposed. The Bode plot is obtained from a single simulation in the time domain using the switching model of the power converter, and injecting a multisine perturbation. The procedure to generate the perturbation, simulate the converter and post-process the response is explained. It is applied to several simulators, both analog (OrCAD/PSPICE, PSIM) and digital (ModelSim), and different DC/DC converters (open- loop and closed-loop). The main advantage of the proposed approach is the important saving in simulation time compared to a single-tone injection approach. I. INTRODUCTION There are several commercial electrical circuit simulators in the market, each one with its particular features, but all of them capable of performing analysis of the circuits in order to obtain time domain waveforms. However, the dynamic performance of power systems is usually evaluated analyzing the behavior of the system in the frequency domain, measuring the Bode plot and calculating the bandwidth and the phase margin. Power systems are mainly based on switching topologies, but most simulators are not oriented to obtain this kind of Bode plots from the switching model. Consequently other alternatives have to be considered, like deriving average models or testing the dynamic behavior from experiments in the time domain, for example step- based ones. Only few commercial simulators perform this kind of Bode plots using the switching model, most of them applying the following methods:
2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2010
Abstract Today, black-box behavioral models of power converters are becoming interesting for s... more Abstract Today, black-box behavioral models of power converters are becoming interesting for system-level analysis. These models can be used to evaluate the response of power electronics systems which are composed of commercial converters, since they can be fully ...
2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2012
ABSTRACT In this paper, the application of multisine signals to the frequency-response measuremen... more ABSTRACT In this paper, the application of multisine signals to the frequency-response measurement of switching converters is addressed. It makes some considerations on the available parameters of the signal and its influence on the measurement. The experimental set-up, where a boost converter is considered due to its well known non-linear effects, is described. Additionally, several experimental results are provided to illustrate all the concepts involved.
2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL), 2013
This paper is focused on a power converter system based on Dual Active Bridge modules input-serie... more This paper is focused on a power converter system based on Dual Active Bridge modules input-series and outputparallel connected (ISOP). Converter modularization is a promising technique from a practical point of view, providing higher input voltage, lower cost and better performance. On the other hand, Dual Active Bridge converter is an interesting topology in bidirectional applications. However, the ISOP connection of DAB converters implies some important control issues, since the connection of independent modules does not ensure a proper distribution of the power, voltages and currents. In this paper a dynamic study of the DAB converter with ISOP connection is done and a control strategy is proposed to warranty a stable operation and an adequate input voltage distribution.
2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL), 2013
ABSTRACT This paper analyzes the behavior of a modular system of DC/DC converters with input-seri... more ABSTRACT This paper analyzes the behavior of a modular system of DC/DC converters with input-series output-series connections. Modularization is a good alternative to provide higher voltage capability, reduce the cost by using the same module to build different power converters or even increase the performance in some cases. However, the control of the converters should be considered carefully, since the system becomes more complex and there are some unstable behaviors that must be avoided. The goal of this work is to explore a simple solution that provides an inherent stable operation thanks to the operation mode of the converters (all of them working as loss-free resistors but on that works in continuous conduction mode). This proposal allows the modular system to operate with a control scheme dramatically simplified.
2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013
ABSTRACT The design of linear compensators is usually based on the frequency response of the syst... more ABSTRACT The design of linear compensators is usually based on the frequency response of the system, considering phase margin PM and cross-over frequency fc as the initial specifications. Applying the k-factor method for synthesis of linear compensators, not all combinations of fc and PM yield feasible or stable designs, and in many cases the design procedure is based on a trial and error procedure. The objective of this paper is to define the fc-PM design space of linear compensators designed applying the k-factor method. This design space can be used to determine in a straightforward way the most appropriate compensator for a given topology, sensor and modulator.
IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243)
ABSTRACT
2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL), 2014
The design of linear compensators is usually based on the frequency response of the system, consi... more The design of linear compensators is usually based on the frequency response of the system, considering phase margin PM and cross-over frequency fc as the initial specifications. Applying the k-factor method for synthesis of linear compensators, not all combinations of fc and PM yield feasible or stable designs, and in many cases the design procedure is based on a trial and error procedure. The objective of this paper is to provide some easy algorithms to define the fc-PM design space of linear compensators designed applying the kfactor method. This design space can be used to determine in a straightforward way the most appropriate compensator for a given topology, sensor and modulator. The example of a VMC buck converter is analyzed, though the presented method can be applied to any topology. I.
2008 IEEE Power Electronics Specialists Conference, 2008
In a contact-less power supply, energy is supplied to the load by means of a loosely coupled tran... more In a contact-less power supply, energy is supplied to the load by means of a loosely coupled transformer. Primary and secondary windings of this transformer are physically and electrically isolated. In most applications, the relative position of the windings can change, but the load has to be supplied despite variations in the coupling coefficient. In this paper, a control strategy
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009
In this work a very simple structure for the implementation of a digital reconfigurable compensat... more In this work a very simple structure for the implementation of a digital reconfigurable compensator based on specific hardware is presented. Its main advantages are the easy way to change the transfer function by changing the clock frequency of the compensator and the reduction of the required digital resources. This approach can be used in systems implementing capabilities such as
Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04.
Interleaved converters are an interesting alternative for many applications due to their advantag... more Interleaved converters are an interesting alternative for many applications due to their advantage in terms of dynamic response, output ripple cancellation, EMI reduction, thermal management and optimized design. In this paper, the benefits of interleaving from the point of view of size and losses reduction of the passive components are quantified. An extensive study has been made considering actual components and technologies and their implication in the final design.
2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551), 2004
... Digital control is suitable for controlling multi-phase converters with simple resources. ...... more ... Digital control is suitable for controlling multi-phase converters with simple resources. ... IkW DC/DC converter with 16 interleaved phases has been built and tested. Results show a very good current distribution and efficiency. ...
2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014
ABSTRACT Current trends in power distribution systems, such as telecommunications, computers, tra... more ABSTRACT Current trends in power distribution systems, such as telecommunications, computers, transportation and utility grid applications, are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since a network of power electronics converters is required to distribute power with appropriate performance. Hence, new challenges regarding integration of a power distribution systems made up by multiple converters must be addressed since the active nature of power electronic converters results in complex dynamic behavior when they are interconnected to each other. In addition, these power distribution systems are typically comprised of subsystems made up by a variety of manufacturers, which do not provide the data required to parameterize a model due to reasons of confidentiality. In this paper, a practical approach to analyze the stability of power distribution systems is proposed in order to provide an easy method to develop the integration of power distribution systems.
2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014
ABSTRACT This work presents the analysis of the behavior of a modular system of DC/DC converters ... more ABSTRACT This work presents the analysis of the behavior of a modular system of DC/DC converters with input-series output-series connections. The goal is to explore a simple solution that provides a stable operation by connecting totally independent converters working in DCM, except one of them (working in CCM) that determines the input-output voltage ratio. This alternative can be applicable when the input voltage and load vary in a very small range. Otherwise, the working conditions or the modules are very variable and they have to be oversized. The paper deals with an improved version of this solution that allows the variation of the input voltage and load in a wider range, achieving a better performance when including an additional control of the input voltages of the DCM modules.
2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014
This paper describes a modular 1 architecture based on the Dual Active Bridge (DAB) converter in ... more This paper describes a modular 1 architecture based on the Dual Active Bridge (DAB) converter in input series, output parallel (ISOP) connection. The work is focused on the input voltage sharing to ensure a proper operation of each module by means of an active control of input and output voltages. A small signal model of the modular architecture is proposed and a decoupled control loops scheme is used to implement the control strategy. An experimental setup has been built in order to validate the model of the DAB converter in ISOP connection and the proposed control strategy, taking into account different operating conditions and constructive parameter values. I.
2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289)
The goal of this paper is to show and quantify the advantages and drawbacks of flex foil technolo... more The goal of this paper is to show and quantify the advantages and drawbacks of flex foil technology and its application field in manufacturing flat HF transformers. A comparison between three different winding technologies (wires, PCB type and flex-foil) based both on experimental and simulation results is presented. Three multiwinding transformers have been built and tested for the same power
APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition, 2007
Contact-less power transference by means of magnetic coupling is a very suitable for powering mov... more Contact-less power transference by means of magnetic coupling is a very suitable for powering moving objects: the lack of wires between the power source and the load avoids possible obstacles to the free movement of the load. In this paper a contact-less power supply for a low power moving load (less that 1 W) is analysed. The design and modelling
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Papers by Pablo Zumel Vaquero