Parallel operation of modular power factor correction circuits

Moo, C.S.; Cheng, Hung‐Liang; Lin, Ping

doi:10.1109/tpel.2002.1004247

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…This may increase switching losses and components. However, as these power converters have to meet very high load demand, which leads to more heat dissipation and high rating of the device, modular converters with different configurations are arrived employing various control methods [14][15][16][17]. Among the various three-phase circuit topologies for power-factor correction (PFC) [18], these modular AC to DC converters have many advantages like flexible load demand, effective current sharing and reduced voltage stress on the switches.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of a linear quadratic regulator controlled active power conditioner for effective source utilisation and voltage regulation in low‐power wind energy conversion systems

Nallusamy¹,

Velayutham²,

Uma³

2015

IET Power Electronics

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Power electronic converters play a major role in wind energy conversion systems (WECS). A typical variable speed WECS includes wind turbine, permanent magnet synchronous generator (PMSG) and power conditioners. In this study, a three-phase modular boost converter supplied from a PMSG and controlled using a linear quadratic regulator (LQR) is proposed for battery charging applications. Each phase of PMSG is connected to a single phase diode rectifier and a DC-DC boost converter. All boost converters have a common output capacitor and load. The proportionalintegral-based voltage controller provides voltage regulation on the DC side. A fixed frequency LQR-based current controller applied for the individual phases provides a better three-phase source utilisation. The instantaneous pq theory is adopted for the reference current calculation. Extensive simulation studies based on the models developed using MATLAB/SIMULINK reveal that the proposed system performs satisfactorily for step variations in wind speed and load. The performance of the low power prototype developed and controlled using a dSPACE 1104 digital signal processor shows good output voltage regulation and better source utilisation for wide variations in load.

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Section: Introductionmentioning

confidence: 99%

Design and implementation of a linear quadratic regulator controlled active power conditioner for effective source utilisation and voltage regulation in low‐power wind energy conversion systems

Nallusamy¹,

Velayutham²,

Uma³

2015

IET Power Electronics

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“…In recent years, the performances of higher order converter with controllers such as hysteresis control, sliding mode control and linear quadratic regulator (LQR) were analysed in many literatures [14][15][16][17][18][19]. However, only few of them address the problems like fault at one phase, module loss and total unbalance supply voltage conditions [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Power quality improvement in a low‐voltage DC ceiling grid powered system

Nallusamy¹,

Velayutham²,

Uma³

et al. 2015

IET Power Electronics

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Power quality is an important issue in low-voltage DC (LVDC) grids which drives light-emitting diode lighting system and many other DC loads in residential applications. The requirement of high-quality power to the lighting system necessitates power factor correction (PFC). This study presents a three-phase modular AC-to-DC converter with a simple controller for PFC in LVDC grids under balanced and unbalanced supply voltage conditions. The proposed circuit consists of three separate single-phase boost converter modules. Each module includes a diode rectifier at the front end, followed by a boost converter. The main advantage of this converter is module loss operation where the DC supply given to the lighting system and other DC loads will be continued even in case of failure of one module. The 24 V DC output voltage is regulated using an outer proportional-integral controller and the input current wave shape in each phase is improved by three individual hysteresis controllers. The controller works successfully in tracking the reference voltage changes in order to vary the regulated DC output voltage. The effectiveness of the controller has been verified by the results obtained through MATLAB/SIMULINK. A prototype model has been developed to validate this system and tested using dSPACE1104 processor.

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“…En el cas dels rectificadors amb elevat factor de potència, la seva paral•lelització és un camp a seguir investigant. Existeixen alguns treballs previs que apunten en aquesta direcció [Moo02] [Kim03] [Huang03], ara bé, es tracta de treballs inicials amb restriccions com la necessitat d'utilitzar mòduls molt similars, o fils d'interconnexió entre convertidors.…”

Section: Rectificadorsunclassified

Aplicació de tècniques de control no lineal per a convertidors electrònics de potència amb consignes variables en el temps

Miret Tomàs

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El principal objetivo de esta Tesis ha sido establecer nuevas estrategias de control para convertidores de potencia simples y paralelizados, que siguen consignes variables en el tiempo. En la Tesis Doctoral se propone una metodología para la síntesis de controladores basados en la linealització por realimentación usando el promediado de estados del convertidor. Esta técnica presenta la ventaja de conseguir controladores sencillos de implementar y que no necesitan sensado de corriente. Esta técnica se ha probado con éxito obteniendo resultados satisfactorios para el caso de seguimiento de señal en convertidores CC/CA y CA/CC, y en la paralelización de estos convertidores. Los objetivos de la investigación han sido los siguientes: a) La síntesis de controladores basados en el modo deslizante y la linealización por realimentación. b) La aplicación de estas estrategias de control para onduladores, filtros activos y rectificadores con elevado factor de potencia. c) La extensión de estos controles a sistemas modulares formados por diversos convertidores en paralelo. d) La simulación de los controles y verificación experimental de los mas representativos, implementándolos digitalmente en una DSP. Estos objetivos se han desarrollado y han quedado plasmados en la redacción de esta Tesis Doctoral y en las diversas publicaciones que se citan en la bibliografía particular de los autores. La metodología que hemos usado en nuestra investigación se puede desglosar en los siguientes puntos: 1. Modelado del convertidor o sistema de convertidores. 2. Síntesis de los controladores utilizando las técnicas de control seleccionadas para cada casuística. 3. Simulación del sistema, obteniendo así sus características dinámicas, a la vez que se valida el controlador. 4. Verificación experimental de los resultados de simulación. Las diferentes fases de la Tesis se han desarrollado siguiendo aproximadamente el orden de los capítulos del documento: El primer capítulo expone el alcance de la Tesis y el estado del arte en la tecnología de control de los sistemas que se trataran. En el segundo capítulo se exponen las ideas del seguimiento en la teoría del control. En el tercer capítulo se desarrolla la teoría básica del control no lineal, haciendo especial énfasis en el control en modo deslizante y el control de linealización por realimentación, que serán aplicados a diversos tipos de convertidores electrónicos de potencia. En el cuarto capítulo se aplican las técnicas de control no lineal a los rectificadores con elevado factor de potencia. En el quinto capítulo se trata de los onduladores y se desarrollan diversos controles no lineales para su control. En el sexto capítulo se trata de los filtros activos correctores de la distorsión harmónica de la corriente de red y diversos controles aplicados. En el séptimo capítulo se trata del diseño de controles para la paralelización de convertidores de potencia con consignas variables en el tiempo. El último capítulo aborda las conclusiones de la Tesis y los futuros caminos para la investigación en este campo abiertos por la Tesis doctoral. The main objective of this Thesis was obtain new control strategies for simple power converters and for converters in parallel. We propose a methodology to synthesize controllers based in feedback linearization, using the converter state averaging. This technique presents the advantage of obtain simple implementation controllers, and that avoids the use of current sensors. This technique was successfully used in this work, with satisfying results for AC/DC converters and DC/AC converters. Good performance was obtained too in the control of multi-module systems, composed of some converters in parallel. The research objectives of the Thesis are the following: a) The controller synthesis, using sliding mode control and feedback linearization. b) The application of this control strategies to inverters, active filters and rectifiers with unity power factor. c) The extension of this controls to modular systems. d) The controller simulation and experimental verification, implementing the control in a DSP platform. Our research methodology was: a) The converter modeling. b) The controller synthesis, using the optimal control techniques for each purpose. c) The system simulation, obtaining its dynamic characteristics to validate the controller. d) The experimental verification of the simulation results. The different stages of the Thesis were developed following approximately the chapter's order of the Thesis document: The first chapter exposes the objectives of the Thesis. The state of the art in the control technology for the converters to study is presented too. The second chapter explains the main objectives in the control theory for signal following converters. The third chapter develops the basic non-linear control theory, with special emphasis in sliding mode control and feedback linearization control. In the fourth chapter the non-linear techniques are used for unity power factor rectifier control synthesis. In the fifth chapter we develop some non-linear controllers for inverters. In the sixth chapter some active filter controls are designed. In the seventh chapter we develop non-linear controllers for power converters in parallel. The conclusions and future perspectives are exposed in the last chapter.

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Parallel operation of modular power factor correction circuits

Cited by 11 publications

References 14 publications

Design and implementation of a linear quadratic regulator controlled active power conditioner for effective source utilisation and voltage regulation in low‐power wind energy conversion systems

Design and implementation of a linear quadratic regulator controlled active power conditioner for effective source utilisation and voltage regulation in low‐power wind energy conversion systems

Power quality improvement in a low‐voltage DC ceiling grid powered system

Aplicació de tècniques de control no lineal per a convertidors electrònics de potència amb consignes variables en el temps

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