EPE Association: EPE 2017 - DS3e: Topic 03: Standard and Advanced Control techniques for Power Converters III

EPE 2017 - DS3e: Topic 03: Standard and Advanced Control techniques for Power Converters III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - DS3e: Topic 03: Standard and Advanced Control techniques for Power Converters III

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   An Efficient Modulation Algorithm for 3-phase NPC Voltage Source Converters
By Andrzej STRAS [View]
[Download]

Abstract: This paper presents an effective pulse width modulation algorithm for four-leg three-level Neutral-Point-Clamped Voltage Source Converters. The proposed method is based on natural coordinates abc and canbe used in three- or four-leg converters. The algorithm is characterized by simplicity and the lack ofa coordinate system transformation. The method was verified by simulations and experiments using alaboratory setup.

   An improved dc-link voltage control for a three-phase PWM rectifier using an adaptive PI controller combined with load current estimation
By Meriem MERAI [View]
[Download]

Abstract: This paper presents a dc-link voltage control for a three-phase PWM rectifier that combines an adaptive PI controller with a feed-forward of the load current which is estimated through a Luenberger observer. A systematic design approach is presented for the adjustment of the adaptive PI and the observer gains. Several simulation and experimental results are presented and discussed in order to show the effectiveness of the proposed dc-link voltage controller compared to the standard one.

   An innovative digitally controlled Power Supply for pulsed Plasma Nitriding Systems
By Lisa FRANKE [View]
[Download]

Abstract: Nitriding in plasma is a power-saving technology that provides thermochemical heat treatment used for metallic workpieces in order to improve their mechanical characteristics like hardness and resistance to wear. This paper describes the new implementation of a microcontroller based platform for pulsed Power Supplies used in Plasma Nitriding Systems (PNS). A programmable hardware was integrated into an existing PNS to optimize the control signals and its flexibility for the high voltage switch (IGBT). Furthermore, comprehensive R&D work as well as according practical implementations were done to set up a microcontroller based feedback control, measurement and monitoring of the current flowing in the load circuit during the treatment process with the objective of completely preventing over currents caused by arc discharge and so leading to a significant improvement of power quality.

   Deadbeat Voltage Mode Control of a DC-DC Boost Converter
By Albert ISKHAKOV [View]
[Download]

Abstract: A control system for a DC-DC boost converter based on a deadbeat controller providing a finite duration transient in a small neighborhood of the equilibrium state is proposed. Deadbeat control is implemented by reducing a system matrix to the Frobenius form without transformation of state variables. A procedure to obtain deadbeat controller parameters for DC-DC boost converter is stated. Mathematical simulation of boost converter in startup mode validated the efficiency of the deadbeat controller.

   Experimental Evaluation of Sphere Decoding for Long-Horizon Direct Model Predictive Control
By Martinus DORFLING [View]
[Download]

Abstract: In the past few years, the interest in model predictive control (MPC) for power electronics has increasedsignificantly. It proves to be a good alternative to space-vector modulation at low switching frequencies.It has been shown that an increase in the prediction horizon improves the system performance.Unfortunately, increasing the horizon leads to an exponential increase in the complexity of the optimizationproblem. To date, most of the work that has been done is only in simulation, ignoring real-timerequirements.This paper offers a practical implementation of long-horizon direct MPC. Methods on how to efficientlyimplement the controller on a field programmable gate array are discussed. Sphere decoding is used tosolve the optimization problem. Results show that the implementation of a 5-step horizon MPC and asphere decoder is very efficient and effective, as it requires only 8.6µs, in roughly 80\% of the cases,to execute the control law with a sampling period of 25µs when a three-phase neutral-point clampedinverter with an RL load is examined.

   Generalized PWM Generator with Transformer Flux Balancing for Dual Active Bridge Converter
By Milos STOJADINOVIC [View]
[Download]

Abstract: For Dual Active Bridge (DAB) converters a large number of modulation schemes exist, which allow to operate the converter in a wide voltage/power range at a very high efficiency. However, the implementation of these modulation schemes and the transition between the schemes during transient conditions is relatively complicated. Therefore, a simple and flexible concept for generating the PWM signals of the eight switches for all possible modulation schemes and also transient conditions is presented in this paper. The concept is validated by Simulink/Plecs cosimulations for a single module of interleaved DC-DC converter system designed as a battery interface for high power drive systems.

   Hybrid Control Concept for Highly Dynamic Buck Converter Systems
By Georgios TSOLARIDIS [View]
[Download]

Abstract: In this paper, a hybrid control concept for highly dynamic DC-DC buck converter systems in current regulationmode is introduced and described in detail. The controller combines the time-optimal dynamic response and excellent large signal properties of an adaptive hysteretic current controller with the reference tracking and insensitivity to parameter uncertainties of an average current controller (eg. PI control). The control concept is compared with benchmark controllers and its superior transient response as well as disturbance-rejection capability under dynamically changing loads is highlighted.

   Model Predictive Control of a 3-Phase Grid-Connected B6-Inverter with LCL-Filter in abc-Coordinates
By Benjamin STICKAN [View]
[Download]

Abstract: A MIMO current-control approach for 3-phase grid connected inverter systems in the abc-frame is proposed.Redundant states are eliminated and the system is controlled via an explicit MPC-approach. Toachieve steady-state accuracy, the system-model is augmented by a simplified grid-model to obtain ahigh dynamic control structure, which supersedes the use of resonant controllers and coordinate transformations. The developed control structure can handle balanced as well as unbalanced grid conditionswithout loss in accuracy and only consists of a single controller whithout any decoupling techniques.Furthermore, the property of MPC-schemes to explicitly respect state and input constraints facilitates theuse of implicit flat-top alike modulation schemes to improve the efficiency for certain inverter topologies.

   Model predictive DC bus voltage regulator with active power curtailment capability for single-phase inverters
By Joan-Marc RODRIGUEZ-BERNUZ [View]
[Download]

Abstract: This document describes a predictive controller specifically designed to trade-off DC bus voltage regulation error, reactive power compensation and active power curtailment during abnormal operating conditions. The controller proposed evaluates different curtailment alternatives during grid faults and applies the optimal control action that enhances the system performance.

   Predictive control of 5-levels AC/DC converter with reduced number of calculations
By Krzysztof KULIKOWSKI [View]
[Download]

Abstract: This paper presents two predictive control methods with reduced number of calculations for five-levelAC/DC rectifier. The first method is the simpler and required to calculate the value of cost function foronly three converter voltage vectors. The second method is using two steps prediction horizon andrequired to calculate cost function for seven vectors in first step and for three vectors for second step.The proposed methods are compared with both one and two step standard model predictive control(MPC) methods. Simulation results confirm a good control quality of proposed methods.

   Three-channels Interleaved PFC Exploiting Mixed Signal Control
By Mario CACCIATO [View]
[Download]

Abstract: A three-channel interleaved Power Factor Correction (PFC) based on a new digital controller STNRGPF01 [7] operating in Continuous Conduction Mode (CCM) is presented in this paper. The control structure is based on a mixed signal concept where the time critical functions such as input current control and fast overcurrent protections are performed using analog parts. All the non-time critical functions, such as e.g. voltage regulation, voltage protections and multiplier, are implemented digitally. Experimental results on a 3kW prototype are provided showing the suitability and the benefits of the mixed signal control.

EPE 2017 - DS3e: Topic 03: Standard and Advanced Control techniques for Power Converters III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - DS3e: Topic 03: Standard and Advanced Control techniques for Power Converters III
	[return to parent folder]

	An Efficient Modulation Algorithm for 3-phase NPC Voltage Source Converters By Andrzej STRAS	[View] [Download]
Abstract: This paper presents an effective pulse width modulation algorithm for four-leg three-level Neutral-Point-Clamped Voltage Source Converters. The proposed method is based on natural coordinates abc and canbe used in three- or four-leg converters. The algorithm is characterized by simplicity and the lack ofa coordinate system transformation. The method was verified by simulations and experiments using alaboratory setup.

	An improved dc-link voltage control for a three-phase PWM rectifier using an adaptive PI controller combined with load current estimation By Meriem MERAI	[View] [Download]
Abstract: This paper presents a dc-link voltage control for a three-phase PWM rectifier that combines an adaptive PI controller with a feed-forward of the load current which is estimated through a Luenberger observer. A systematic design approach is presented for the adjustment of the adaptive PI and the observer gains. Several simulation and experimental results are presented and discussed in order to show the effectiveness of the proposed dc-link voltage controller compared to the standard one.

	An innovative digitally controlled Power Supply for pulsed Plasma Nitriding Systems By Lisa FRANKE	[View] [Download]
Abstract: Nitriding in plasma is a power-saving technology that provides thermochemical heat treatment used for metallic workpieces in order to improve their mechanical characteristics like hardness and resistance to wear. This paper describes the new implementation of a microcontroller based platform for pulsed Power Supplies used in Plasma Nitriding Systems (PNS). A programmable hardware was integrated into an existing PNS to optimize the control signals and its flexibility for the high voltage switch (IGBT). Furthermore, comprehensive R&D work as well as according practical implementations were done to set up a microcontroller based feedback control, measurement and monitoring of the current flowing in the load circuit during the treatment process with the objective of completely preventing over currents caused by arc discharge and so leading to a significant improvement of power quality.

	Deadbeat Voltage Mode Control of a DC-DC Boost Converter By Albert ISKHAKOV	[View] [Download]
Abstract: A control system for a DC-DC boost converter based on a deadbeat controller providing a finite duration transient in a small neighborhood of the equilibrium state is proposed. Deadbeat control is implemented by reducing a system matrix to the Frobenius form without transformation of state variables. A procedure to obtain deadbeat controller parameters for DC-DC boost converter is stated. Mathematical simulation of boost converter in startup mode validated the efficiency of the deadbeat controller.

	Experimental Evaluation of Sphere Decoding for Long-Horizon Direct Model Predictive Control By Martinus DORFLING	[View] [Download]
Abstract: In the past few years, the interest in model predictive control (MPC) for power electronics has increasedsignificantly. It proves to be a good alternative to space-vector modulation at low switching frequencies.It has been shown that an increase in the prediction horizon improves the system performance.Unfortunately, increasing the horizon leads to an exponential increase in the complexity of the optimizationproblem. To date, most of the work that has been done is only in simulation, ignoring real-timerequirements.This paper offers a practical implementation of long-horizon direct MPC. Methods on how to efficientlyimplement the controller on a field programmable gate array are discussed. Sphere decoding is used tosolve the optimization problem. Results show that the implementation of a 5-step horizon MPC and asphere decoder is very efficient and effective, as it requires only 8.6µs, in roughly 80\% of the cases,to execute the control law with a sampling period of 25µs when a three-phase neutral-point clampedinverter with an RL load is examined.

	Generalized PWM Generator with Transformer Flux Balancing for Dual Active Bridge Converter By Milos STOJADINOVIC	[View] [Download]
Abstract: For Dual Active Bridge (DAB) converters a large number of modulation schemes exist, which allow to operate the converter in a wide voltage/power range at a very high efficiency. However, the implementation of these modulation schemes and the transition between the schemes during transient conditions is relatively complicated. Therefore, a simple and flexible concept for generating the PWM signals of the eight switches for all possible modulation schemes and also transient conditions is presented in this paper. The concept is validated by Simulink/Plecs cosimulations for a single module of interleaved DC-DC converter system designed as a battery interface for high power drive systems.

	Hybrid Control Concept for Highly Dynamic Buck Converter Systems By Georgios TSOLARIDIS	[View] [Download]
Abstract: In this paper, a hybrid control concept for highly dynamic DC-DC buck converter systems in current regulationmode is introduced and described in detail. The controller combines the time-optimal dynamic response and excellent large signal properties of an adaptive hysteretic current controller with the reference tracking and insensitivity to parameter uncertainties of an average current controller (eg. PI control). The control concept is compared with benchmark controllers and its superior transient response as well as disturbance-rejection capability under dynamically changing loads is highlighted.

	Model Predictive Control of a 3-Phase Grid-Connected B6-Inverter with LCL-Filter in abc-Coordinates By Benjamin STICKAN	[View] [Download]
Abstract: A MIMO current-control approach for 3-phase grid connected inverter systems in the abc-frame is proposed.Redundant states are eliminated and the system is controlled via an explicit MPC-approach. Toachieve steady-state accuracy, the system-model is augmented by a simplified grid-model to obtain ahigh dynamic control structure, which supersedes the use of resonant controllers and coordinate transformations. The developed control structure can handle balanced as well as unbalanced grid conditionswithout loss in accuracy and only consists of a single controller whithout any decoupling techniques.Furthermore, the property of MPC-schemes to explicitly respect state and input constraints facilitates theuse of implicit flat-top alike modulation schemes to improve the efficiency for certain inverter topologies.

	Model predictive DC bus voltage regulator with active power curtailment capability for single-phase inverters By Joan-Marc RODRIGUEZ-BERNUZ	[View] [Download]
Abstract: This document describes a predictive controller specifically designed to trade-off DC bus voltage regulation error, reactive power compensation and active power curtailment during abnormal operating conditions. The controller proposed evaluates different curtailment alternatives during grid faults and applies the optimal control action that enhances the system performance.

	Predictive control of 5-levels AC/DC converter with reduced number of calculations By Krzysztof KULIKOWSKI	[View] [Download]
Abstract: This paper presents two predictive control methods with reduced number of calculations for five-levelAC/DC rectifier. The first method is the simpler and required to calculate the value of cost function foronly three converter voltage vectors. The second method is using two steps prediction horizon andrequired to calculate cost function for seven vectors in first step and for three vectors for second step.The proposed methods are compared with both one and two step standard model predictive control(MPC) methods. Simulation results confirm a good control quality of proposed methods.

	Three-channels Interleaved PFC Exploiting Mixed Signal Control By Mario CACCIATO	[View] [Download]
Abstract: A three-channel interleaved Power Factor Correction (PFC) based on a new digital controller STNRGPF01 [7] operating in Continuous Conduction Mode (CCM) is presented in this paper. The control structure is based on a mixed signal concept where the time critical functions such as input current control and fast overcurrent protections are performed using analog parts. All the non-time critical functions, such as e.g. voltage regulation, voltage protections and multiplier, are implemented digitally. Experimental results on a 3kW prototype are provided showing the suitability and the benefits of the mixed signal control.