EPE Association: EPE 2011 - DS1i: Topic 07: Application of Control Methods to Electrical Systems

EPE 2011 - DS1i: Topic 07: Application of Control Methods to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 07: Application of Control Methods To Electrical Systems > EPE 2011 - DS1i: Topic 07: Application of Control Methods to Electrical Systems

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   An Improved Finite Control Set -Model Predictive Control (FCS-MPC) algorithm with Imposed Optimized Weighting Factor
By S. Alireza DAVARI, Davood ARAB KHABURI, Peter STOLZE, Ralph KENNEL [View]
[Download]

Abstract: In this paper an improved FCS-MPC algorithm with optimized weighting factor is presented. The main goal is reducing the torque ripples for the two-level inverter utilization. The weighting factor is optimized based on dividing the control interval in two parts. The method is validated by simulations and experiments.

   Comparative Evaluation of Fuzzy-PI and PI Control Methods for a Three Phase Grid Connected Inverter
By Georgios TSENGENES, Georgios ADAMIDIS [View]
[Download]

Abstract: This research addresses the issue of power electronics control scheme for grid integration of a distribution generation unit. For the improvement of the current control and DC bus voltage control, the application of the PI and Fizzy-PI controller is investigated. Theoretical and mathematical analysis of the internal structure of the PI and Fuzzy-PI controller is carried out. Using the software Matlab/Simulink, the behavior of the controllers for DC bus voltage and current control is investigated. A comparative evaluation of the controllers both in steady state and transient response is presented. Furthermore the PI and Fuzzy-PI controller are compared based on THDi index of the inverter’s current. The ability of the inverter to provide ancillary services to the electric power system though the uninterrupted compensation of the reactive power of the load is studied, as well.

   Design and Analysis of a Flatness-Based Control Approach for Speed Control of Drive Systems with Elastic Couplings and Uncertain Loads
By Sönke THOMSEN, Friedrich W. FUCHS [View]
[Download]

Abstract: Finite stiffness of drive shafts in drive applications can cause undesired torsional oscillations which can lead to a reduced control performance, high stress on the mechanical parts and therefore a reduced lifetime of the drive system.For a high dynamic speed control and the reduction of torsional oscillations, the dynamic of the shaft torsion has to be considered in the control synthesis. Conventional control structures with a PI-based feedback controller are not able to reduce torsional oscillations effectively. Model based control methods are promising to handle this problem. The model based control method presented in this analysis is based on the system property called flatness. It consists of a flatness-based feedforward control and a feedback stabilizing controller.The flatness-based control is designed for drive systems with elastic couplings and analyzed concerning the achievable dynamic performance and the robustness concerning parameter as well as unstructured uncertainties.The effectiveness of the flatness-based control method is verified by simulations and measurements on a laboratory test bench.

   Finite-Set Model Predictive Control of a Flying Capacitor Converter With Hysteresis Voltage Balancing
By Peter STOLZE, Peter LANDSMANN, Ralph KENNEL, Hendrik du Toit MOUTON [View]
[Download]

Abstract: This paper presents a predictive strategy for current control of a three-phase flying capacitor converter.Future values of the load current and flying capacitor voltages are predicted with discrete-time systemmodels. An offline solution for obtaining the best one of the 19 possible voltage vectors is combined witha hysteresis-based voltage balancing algorithm which makes use of the redundancy of the 64 switchingpossibilities of the converter. With few modifications this principle can easily be extended to inverterswith a higher number of voltage levels.

   Finite-Set Model Predictive Control with Heuristic Voltage Vector Preselection for Higher Prediction Horizons
By Peter STOLZE, Peter LANDSMANN, Ralph KENNEL, Hendrik du Toit MOUTON [View]
[Download]

Abstract: This paper presents a direct model-based predictive control strategy for current control of a resistive-inductive-active load with a two-level inverter. A heuristic method is used in order to reduce the calculationeffort and to increase the prediction horizon. The active part of the load is determined by adisturbance observer.

   Open-loop Approach for Control of Multi-terminal DC systems based on Modular Multilevel Converters
By Arif HAIDER, Noman AHMED, Lennart ANGQUIST, Hans-Peter NEE [View]
[Download]

Abstract: In this paper a multi-terminal direct current (MTDC) system with modular multilevel converters (M2Cs) is suggested. An open loop control method is used for the control of the converters. Each converter is modeled with 36 sub-modules per arm with a total of 216 sub-modules consisting of half bridges. Power-synchronization control is used instead of a phase-locked loop (PLL) for synchronization. Thus, the short circuit capacities of the ac systems are no longer limiting factors and the instability caused by the PLL in weak ac systems is avoided [10]. A direct voltage controller is implemented with power-synchronization control as an inner loop in one station. Several scenarios are analyzed to demonstrate control flexibility and ride-through capability for grid transients. By means of analytical calculations and time simulations in PSCAD/EMTDC, the validity of the proposed MTDC system is confirmed.

   Optimal control of voltage source converters for fault operation
By Fernando BIANCHI, Agustì EGEA-ALVAREZ, Adrià JUNYENT-FERRÉ, Oriol GOMIS-BELLMUNT [View]
[Download]

Abstract: An optimal control scheme for voltage source converters (VSC) is presented. The proposed control is based on multi-variable and anti-windup control ideas with the objective of improving the ride-through capability of the VSC. The proposed scheme is evaluated by simulations and compared with classical controls.

   Research on the Z-source inverter grid-connected control of micro-grid based on differential geometry
By Chen YAN [View]
[Download]

Abstract: Aiming at the Z-source inverter used in the micro-grid and its grid-connected control research, the photovoltaic system was taken as the example. The inverter integrated three functions including MPPT (Maximum Power Point Tracking), step-up/down DC-side voltage and output grid-connected. In order to overcome the system instability caused by zero point of Z-source net in the right half-plane, the paper proposed nonlinear control method based on differential geometry theoretic, which overcomes the non-minimum phase behavior. When the input condition of the photovoltaic system changes, this control method could make the Z-source inverter DC side output track the MPP rapidly, steadily and little overshoot, and the inverting side output three-phase voltage transmit rapidly and steadily, then improved the quality of grid-connected current. The simulation contrast and experiment result proved the proposed method in the paper is correct and effective.

   Sensor Fault-Tolerant Control of an Induction Motor Based Electric Vehicle
By Bekheïra TABBACHE, Mohamed BENBOUZID, Abdelaziz KHELOUI, Jean-Matthieu BOURGEOT [View]
[Download]

Abstract: This paper deals with sensor fault detection within a reconfigurable direct torque control of aninduction motor-based electric vehicle. The proposed strategy concerns current, voltage and speedsensors faults that are detected and followed by control reconfiguration in order to allow the vehiclecontinuous operation.The proposed approach is validated through experiments on an induction motor drive and simulationson an electric vehicle using a European urban and extra urban driving cycle.

   Sliding mode control, dynamic assessment and practical implementation of a bidirectional buck / boost dc to dc converter
By Anthony GEE, Francis ROBINSON , Rod DUNN [View]
[Download]

Abstract: This paper presents a bidirectional half bridge DC/DC converter, featuring a novel sliding-mode controller, input and output short-circuit protection and a wide input voltage operating range. The ability to achieve step-up or step-down voltage conversion and accommodate a wide input voltage variation makes this design particularly useful for interfacing energy storage devices whose voltage varies widely with state of charge such as supercapacitor modules. The control theory and design methodology are described and converter performance is assessed at realistic operating levels by simulation and experiment. Benefits are shown to include good performance over a wide range of operating conditions and a relatively simple controller-hardware requirement.

   Speed Estimation using ANFIS With The Adaptive Controller Of Magnetically Saturated InductionMotor
By Mohamed Ahmed MOUSTAFA HASSAN, Mohamed M. ISMAIL [View]
[Download]

Abstract: The problem of controlling the π-model induction motor with magnetic saturation is considered in this proposed research. The speed sensorless using Adaptive Neuro Fuzzy Inference Systems (ANFIS) technique will be used for the adaptive controller with stator current and speed measurement. This proposed research introduces the use of ANFIS technique for motor speed estimation, so there is no need of speed sensor which can reduce the cost than the old method with the classical estimation of any deviation in rotor resistance and load torque. A comparison study is illustrated between the new proposed method and with the previous works that done with speed measurement, which depends on stator currents and speed measurements. All the unknown parameters are assumed constant or slowly varying and are estimated online by the controller. Simulation results are provided for illustration. The proposed technique shows promising results.

EPE 2011 - DS1i: Topic 07: Application of Control Methods to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 07: Application of Control Methods To Electrical Systems > EPE 2011 - DS1i: Topic 07: Application of Control Methods to Electrical Systems
	[return to parent folder]

	An Improved Finite Control Set -Model Predictive Control (FCS-MPC) algorithm with Imposed Optimized Weighting Factor By S. Alireza DAVARI, Davood ARAB KHABURI, Peter STOLZE, Ralph KENNEL	[View] [Download]
Abstract: In this paper an improved FCS-MPC algorithm with optimized weighting factor is presented. The main goal is reducing the torque ripples for the two-level inverter utilization. The weighting factor is optimized based on dividing the control interval in two parts. The method is validated by simulations and experiments.

	Comparative Evaluation of Fuzzy-PI and PI Control Methods for a Three Phase Grid Connected Inverter By Georgios TSENGENES, Georgios ADAMIDIS	[View] [Download]
Abstract: This research addresses the issue of power electronics control scheme for grid integration of a distribution generation unit. For the improvement of the current control and DC bus voltage control, the application of the PI and Fizzy-PI controller is investigated. Theoretical and mathematical analysis of the internal structure of the PI and Fuzzy-PI controller is carried out. Using the software Matlab/Simulink, the behavior of the controllers for DC bus voltage and current control is investigated. A comparative evaluation of the controllers both in steady state and transient response is presented. Furthermore the PI and Fuzzy-PI controller are compared based on THDi index of the inverter’s current. The ability of the inverter to provide ancillary services to the electric power system though the uninterrupted compensation of the reactive power of the load is studied, as well.

	Design and Analysis of a Flatness-Based Control Approach for Speed Control of Drive Systems with Elastic Couplings and Uncertain Loads By Sönke THOMSEN, Friedrich W. FUCHS	[View] [Download]
Abstract: Finite stiffness of drive shafts in drive applications can cause undesired torsional oscillations which can lead to a reduced control performance, high stress on the mechanical parts and therefore a reduced lifetime of the drive system.For a high dynamic speed control and the reduction of torsional oscillations, the dynamic of the shaft torsion has to be considered in the control synthesis. Conventional control structures with a PI-based feedback controller are not able to reduce torsional oscillations effectively. Model based control methods are promising to handle this problem. The model based control method presented in this analysis is based on the system property called flatness. It consists of a flatness-based feedforward control and a feedback stabilizing controller.The flatness-based control is designed for drive systems with elastic couplings and analyzed concerning the achievable dynamic performance and the robustness concerning parameter as well as unstructured uncertainties.The effectiveness of the flatness-based control method is verified by simulations and measurements on a laboratory test bench.

	Finite-Set Model Predictive Control of a Flying Capacitor Converter With Hysteresis Voltage Balancing By Peter STOLZE, Peter LANDSMANN, Ralph KENNEL, Hendrik du Toit MOUTON	[View] [Download]
Abstract: This paper presents a predictive strategy for current control of a three-phase flying capacitor converter.Future values of the load current and flying capacitor voltages are predicted with discrete-time systemmodels. An offline solution for obtaining the best one of the 19 possible voltage vectors is combined witha hysteresis-based voltage balancing algorithm which makes use of the redundancy of the 64 switchingpossibilities of the converter. With few modifications this principle can easily be extended to inverterswith a higher number of voltage levels.

	Finite-Set Model Predictive Control with Heuristic Voltage Vector Preselection for Higher Prediction Horizons By Peter STOLZE, Peter LANDSMANN, Ralph KENNEL, Hendrik du Toit MOUTON	[View] [Download]
Abstract: This paper presents a direct model-based predictive control strategy for current control of a resistive-inductive-active load with a two-level inverter. A heuristic method is used in order to reduce the calculationeffort and to increase the prediction horizon. The active part of the load is determined by adisturbance observer.

	Open-loop Approach for Control of Multi-terminal DC systems based on Modular Multilevel Converters By Arif HAIDER, Noman AHMED, Lennart ANGQUIST, Hans-Peter NEE	[View] [Download]
Abstract: In this paper a multi-terminal direct current (MTDC) system with modular multilevel converters (M2Cs) is suggested. An open loop control method is used for the control of the converters. Each converter is modeled with 36 sub-modules per arm with a total of 216 sub-modules consisting of half bridges. Power-synchronization control is used instead of a phase-locked loop (PLL) for synchronization. Thus, the short circuit capacities of the ac systems are no longer limiting factors and the instability caused by the PLL in weak ac systems is avoided [10]. A direct voltage controller is implemented with power-synchronization control as an inner loop in one station. Several scenarios are analyzed to demonstrate control flexibility and ride-through capability for grid transients. By means of analytical calculations and time simulations in PSCAD/EMTDC, the validity of the proposed MTDC system is confirmed.

	Optimal control of voltage source converters for fault operation By Fernando BIANCHI, Agustì EGEA-ALVAREZ, Adrià JUNYENT-FERRÉ, Oriol GOMIS-BELLMUNT	[View] [Download]
Abstract: An optimal control scheme for voltage source converters (VSC) is presented. The proposed control is based on multi-variable and anti-windup control ideas with the objective of improving the ride-through capability of the VSC. The proposed scheme is evaluated by simulations and compared with classical controls.

	Research on the Z-source inverter grid-connected control of micro-grid based on differential geometry By Chen YAN	[View] [Download]
Abstract: Aiming at the Z-source inverter used in the micro-grid and its grid-connected control research, the photovoltaic system was taken as the example. The inverter integrated three functions including MPPT (Maximum Power Point Tracking), step-up/down DC-side voltage and output grid-connected. In order to overcome the system instability caused by zero point of Z-source net in the right half-plane, the paper proposed nonlinear control method based on differential geometry theoretic, which overcomes the non-minimum phase behavior. When the input condition of the photovoltaic system changes, this control method could make the Z-source inverter DC side output track the MPP rapidly, steadily and little overshoot, and the inverting side output three-phase voltage transmit rapidly and steadily, then improved the quality of grid-connected current. The simulation contrast and experiment result proved the proposed method in the paper is correct and effective.

	Sensor Fault-Tolerant Control of an Induction Motor Based Electric Vehicle By Bekheïra TABBACHE, Mohamed BENBOUZID, Abdelaziz KHELOUI, Jean-Matthieu BOURGEOT	[View] [Download]
Abstract: This paper deals with sensor fault detection within a reconfigurable direct torque control of aninduction motor-based electric vehicle. The proposed strategy concerns current, voltage and speedsensors faults that are detected and followed by control reconfiguration in order to allow the vehiclecontinuous operation.The proposed approach is validated through experiments on an induction motor drive and simulationson an electric vehicle using a European urban and extra urban driving cycle.

	Sliding mode control, dynamic assessment and practical implementation of a bidirectional buck / boost dc to dc converter By Anthony GEE, Francis ROBINSON , Rod DUNN	[View] [Download]
Abstract: This paper presents a bidirectional half bridge DC/DC converter, featuring a novel sliding-mode controller, input and output short-circuit protection and a wide input voltage operating range. The ability to achieve step-up or step-down voltage conversion and accommodate a wide input voltage variation makes this design particularly useful for interfacing energy storage devices whose voltage varies widely with state of charge such as supercapacitor modules. The control theory and design methodology are described and converter performance is assessed at realistic operating levels by simulation and experiment. Benefits are shown to include good performance over a wide range of operating conditions and a relatively simple controller-hardware requirement.

	Speed Estimation using ANFIS With The Adaptive Controller Of Magnetically Saturated InductionMotor By Mohamed Ahmed MOUSTAFA HASSAN, Mohamed M. ISMAIL	[View] [Download]
Abstract: The problem of controlling the π-model induction motor with magnetic saturation is considered in this proposed research. The speed sensorless using Adaptive Neuro Fuzzy Inference Systems (ANFIS) technique will be used for the adaptive controller with stator current and speed measurement. This proposed research introduces the use of ANFIS technique for motor speed estimation, so there is no need of speed sensor which can reduce the cost than the old method with the classical estimation of any deviation in rotor resistance and load torque. A comparison study is illustrated between the new proposed method and with the previous works that done with speed measurement, which depends on stator currents and speed measurements. All the unknown parameters are assumed constant or slowly varying and are estimated online by the controller. Simulation results are provided for illustration. The proposed technique shows promising results.