EPE Association: EPE 2014 - LS3e: Standards and Advanced Control Techniques for Power Converters

EPE 2014 - LS3e: Standards and Advanced Control Techniques for Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 03: Measurement and Control > EPE 2014 - LS3e: Standards and Advanced Control Techniques for Power Converters

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   Analysis of the effect of modulation delays on the size of the output capacitor
By Jorge CORTÉS, Vladimir SVIKOVIC, Pedro ALOU, Jesus Angel OLIVER, José Antonio COBOS [View]
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Abstract: Constant frequency (PWM), constant on-time (COT) and constant off-time modulations exhibit inherentdelays where the controller is unable to respond instantaneously. These delays can increasethe required size of the output capacitor to meet dynamic requirements in applications with highdemanding load such as the supply of microprocessors. This paper analyzes the minimum requiredoutput filter (output inductor and output capacitor) to meet a given specification and quantifies theeffect that different modulations have in the minimum size of the output capacitor. The paper alsoshows a novel technique to mitigate the delays of the modulations by means of synchronizing theload step with the clock of the modulation. This technique is applicable to most of controllers as itonly acts on the modulator

   Common-mode EMI Suppression Based on Chaotic SPWM for a Single-phase Transformerless Photovoltaic Inverter
By Hong LI, Zhichang YANG, Trillion Q. ZHENG, Bo ZHANG, Hu SUN [View]
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Abstract: The transformerless photovoltaic (TPV) inverters can cause serious common-mode electromagnetic interference (EMI) due to the parasitic capacitors between the solar arrays and ground. In this paper, chaotic SPWM is firstly proposed to suppress the common-mode EMI in TPV inverters. The EMI suppression mechanism of chaotic SPWM is introduced, and chaotic SPWM is further applied into a single-phase TPV inverter, the equivalent common-mode current loop of the single-phase TPV inverter is established, moreover, the common mode currents of the TPV inverter under SPWM and chaotic SPWM are given and their spectra are analyzed. Finally, the simulation and experiment results validate the effectiveness of chaotic SPWM in common-mode EMI suppression.

   DC / DC converters as DC circuit-breakers in HVDC networks operation
By Miguel JIMENEZ CARRIZOSA, Jorge CORTÉS, Abdelkrim BENCHAIB, Pedro ALOU, Gilney DAMM, José Antonio COBOS, Françoise LAMNABHI [View]
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Abstract: This paper presents the modeling and control of a DC/DC bidirectional converter suitable for medium voltage and power applications in Multi-Terminals HVDC (MT-HVDC) grids. Moreover its use as DC circuit-breaker is described. This is a new concept, against the contemporary studies of DC breakers, which could help for the implementation of MT-HVDC networks. The proposed multilevel topology is based on Dual Active Bridge (DAB). The overall control of the DC/DC converter is achieved by using a nonlinear control based in Lyapunov theory.

   Flatness-Based Voltage Tracking Control for Power Converters in Autonomous Microgrids
By BJÖRN HEINBOKEL, SIBYLLE DIECKERHOFF [View]
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Abstract: This paper presents a new voltage tracking controller for LCL-filter connected distributed power converters.The control system incorporates droop control laws using a second order low-pass filter and a high-bandwidth numerical differentiation method. Spectral analyses show an enhanced output impedance and command tracking compared to industry standard regulators.

EPE 2014 - LS3e: Standards and Advanced Control Techniques for Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 03: Measurement and Control > EPE 2014 - LS3e: Standards and Advanced Control Techniques for Power Converters
	[return to parent folder]

	Analysis of the effect of modulation delays on the size of the output capacitor By Jorge CORTÉS, Vladimir SVIKOVIC, Pedro ALOU, Jesus Angel OLIVER, José Antonio COBOS	[View] [Download]
Abstract: Constant frequency (PWM), constant on-time (COT) and constant off-time modulations exhibit inherentdelays where the controller is unable to respond instantaneously. These delays can increasethe required size of the output capacitor to meet dynamic requirements in applications with highdemanding load such as the supply of microprocessors. This paper analyzes the minimum requiredoutput filter (output inductor and output capacitor) to meet a given specification and quantifies theeffect that different modulations have in the minimum size of the output capacitor. The paper alsoshows a novel technique to mitigate the delays of the modulations by means of synchronizing theload step with the clock of the modulation. This technique is applicable to most of controllers as itonly acts on the modulator

	Common-mode EMI Suppression Based on Chaotic SPWM for a Single-phase Transformerless Photovoltaic Inverter By Hong LI, Zhichang YANG, Trillion Q. ZHENG, Bo ZHANG, Hu SUN	[View] [Download]
Abstract: The transformerless photovoltaic (TPV) inverters can cause serious common-mode electromagnetic interference (EMI) due to the parasitic capacitors between the solar arrays and ground. In this paper, chaotic SPWM is firstly proposed to suppress the common-mode EMI in TPV inverters. The EMI suppression mechanism of chaotic SPWM is introduced, and chaotic SPWM is further applied into a single-phase TPV inverter, the equivalent common-mode current loop of the single-phase TPV inverter is established, moreover, the common mode currents of the TPV inverter under SPWM and chaotic SPWM are given and their spectra are analyzed. Finally, the simulation and experiment results validate the effectiveness of chaotic SPWM in common-mode EMI suppression.

	DC / DC converters as DC circuit-breakers in HVDC networks operation By Miguel JIMENEZ CARRIZOSA, Jorge CORTÉS, Abdelkrim BENCHAIB, Pedro ALOU, Gilney DAMM, José Antonio COBOS, Françoise LAMNABHI	[View] [Download]
Abstract: This paper presents the modeling and control of a DC/DC bidirectional converter suitable for medium voltage and power applications in Multi-Terminals HVDC (MT-HVDC) grids. Moreover its use as DC circuit-breaker is described. This is a new concept, against the contemporary studies of DC breakers, which could help for the implementation of MT-HVDC networks. The proposed multilevel topology is based on Dual Active Bridge (DAB). The overall control of the DC/DC converter is achieved by using a nonlinear control based in Lyapunov theory.

	Flatness-Based Voltage Tracking Control for Power Converters in Autonomous Microgrids By BJÖRN HEINBOKEL, SIBYLLE DIECKERHOFF	[View] [Download]
Abstract: This paper presents a new voltage tracking controller for LCL-filter connected distributed power converters.The control system incorporates droop control laws using a second order low-pass filter and a high-bandwidth numerical differentiation method. Spectral analyses show an enhanced output impedance and command tracking compared to industry standard regulators.