EPE Association: EPE 2016 - LS6d: Standard and Advanced Control Techniques for Power Converters

EPE 2016 - LS6d: Standard and Advanced Control Techniques for Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 03: Measurement and Control > EPE 2016 - LS6d: Standard and Advanced Control Techniques for Power Converters

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   A new modulation method for multilevel converters
By Francisco GORDILLO [View]
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Abstract: This paper presents a simple method for modulation in multilevel converters, which is hardly affected with the number of levels. The method is based on a simple graph, whose x-axis is directly related to the extra degree of freedom associated with component gamma (in the alpha-beta-gamma reference frame) of the desired reference vector. In the $y$-axis, the different possibilities for the phase averaged references are plotted. In this way, the degree of freedom is more explicit than in Space Vector Modulation (SVM) and it can be the basis of new algorithms to pursue additional control objectives such as voltage balancing or common-mode reduction, among others. A comparison with SVM based on examples is included, showing the benefits of the proposed modulation strategy.

   Direct Model Predictive Voltage Control of Quasi-Z-Source Inverters with LC Filters
By Ayman AYAD [View]
[Download]

Abstract: This paper presents a direct model predictive control (MPC) strategy for the quasi-Z-source inverter connected to a linear/nonlinear load via an intermediate LC filter. The proposed scheme simultaneously controls the ac-side output voltage and the dc-side capacitor voltage and inductor current. The discretetime model of the converter is derived which can be used for both modes of operations, namely the buck and boost mode. Evaluation results are presented to highlight the performance of the proposed strategy.

   Efficiency Comparison of Active and Passive Grid Filter Damping Methods using Direct Matrix Converter
By Nico REMUS [View]
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Abstract: In this paper two recent presented active grid current stabilisation strategies for direct matrix converterbased drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts.While the functionality of the active stabilisation strategies has been proven already this publicationfocuses on the harmonic distortion of grid and machine current as well as the efficiency of converterand machine. The purpose is to rate the performance of the active damping approaches. After a shortintroduction of the stabilisation strategies the experimental setup is described. Finally, several points ofoperation will be used to evaluate the strategies for long term use.

   High Bandwidth Phase Voltage and Phase Current Control Loop of a Permanent Magnet Synchronous Motor based on Delta Sigma Bitstreams
By Michael HOMANN [View]
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Abstract: Delta Sigma analog digital converters are usually comprised of an analog modulator and a digital low pass filter. These converters are used for phase voltage and phase current measurement in control loops. A new approach, the delta sigma signal processing (DSSP), directly processes the high frequent delta sigma bitstream. Due to the high frequent sampling rate of the DSSP, sampling effects can be neglected and a high closed loop bandwidth is achieved. In order to fully utilize the advantages of this concept, a high bandwidth three phase hysteresis modulator for power electronics is presented. Since the hysteresis modulator is based on DSSP, the delta sigma bitstreams of phase voltage and current measurement can be directly processed. The performance of this feedback is evaluated with regard to the compensation of inverter nonlinearities, average switching frequencies and the dynamic behavior of the control loops.

EPE 2016 - LS6d: Standard and Advanced Control Techniques for Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 03: Measurement and Control > EPE 2016 - LS6d: Standard and Advanced Control Techniques for Power Converters
	[return to parent folder]

	A new modulation method for multilevel converters By Francisco GORDILLO	[View] [Download]
Abstract: This paper presents a simple method for modulation in multilevel converters, which is hardly affected with the number of levels. The method is based on a simple graph, whose x-axis is directly related to the extra degree of freedom associated with component gamma (in the alpha-beta-gamma reference frame) of the desired reference vector. In the $y$-axis, the different possibilities for the phase averaged references are plotted. In this way, the degree of freedom is more explicit than in Space Vector Modulation (SVM) and it can be the basis of new algorithms to pursue additional control objectives such as voltage balancing or common-mode reduction, among others. A comparison with SVM based on examples is included, showing the benefits of the proposed modulation strategy.

	Direct Model Predictive Voltage Control of Quasi-Z-Source Inverters with LC Filters By Ayman AYAD	[View] [Download]
Abstract: This paper presents a direct model predictive control (MPC) strategy for the quasi-Z-source inverter connected to a linear/nonlinear load via an intermediate LC filter. The proposed scheme simultaneously controls the ac-side output voltage and the dc-side capacitor voltage and inductor current. The discretetime model of the converter is derived which can be used for both modes of operations, namely the buck and boost mode. Evaluation results are presented to highlight the performance of the proposed strategy.

	Efficiency Comparison of Active and Passive Grid Filter Damping Methods using Direct Matrix Converter By Nico REMUS	[View] [Download]
Abstract: In this paper two recent presented active grid current stabilisation strategies for direct matrix converterbased drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts.While the functionality of the active stabilisation strategies has been proven already this publicationfocuses on the harmonic distortion of grid and machine current as well as the efficiency of converterand machine. The purpose is to rate the performance of the active damping approaches. After a shortintroduction of the stabilisation strategies the experimental setup is described. Finally, several points ofoperation will be used to evaluate the strategies for long term use.

	High Bandwidth Phase Voltage and Phase Current Control Loop of a Permanent Magnet Synchronous Motor based on Delta Sigma Bitstreams By Michael HOMANN	[View] [Download]
Abstract: Delta Sigma analog digital converters are usually comprised of an analog modulator and a digital low pass filter. These converters are used for phase voltage and phase current measurement in control loops. A new approach, the delta sigma signal processing (DSSP), directly processes the high frequent delta sigma bitstream. Due to the high frequent sampling rate of the DSSP, sampling effects can be neglected and a high closed loop bandwidth is achieved. In order to fully utilize the advantages of this concept, a high bandwidth three phase hysteresis modulator for power electronics is presented. Since the hysteresis modulator is based on DSSP, the delta sigma bitstreams of phase voltage and current measurement can be directly processed. The performance of this feedback is evaluated with regard to the compensation of inverter nonlinearities, average switching frequencies and the dynamic behavior of the control loops.