EPE Association: EPE 2020 - LS2d: Converter Control

EPE 2020 - LS2d: Converter Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - LS2d: Converter Control

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   Comparison of Decoupling Techniques via Discrete Luenberger Style Observer for Voltage Oriented Control
By Gyanendra Kumar SAH [View]
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Abstract: This work focuses on the implementation, analysis, and comparison of discrete-time synchronous framecurrent controllers for grid-connected three-phase VSIs using Discrete Luenberger Style Observers(DLSO) in both synchronous (dq), and stationary (aß) frames including the controller's computationaldelay compensation. Further, the unique cross-coupling effects of the voltages and currents in thediscrete domain are discussed. Pole-zero cancellation techniques are used for the tuning of the currentcontrollers. A discrete Phase-Locked Loop (PLL) with decoupled nonlinearities is proposed. For eachtopology, Frequency Response Function (FRF) plots and the step responses are obtained and analyzed.

   Cost Function Design for Stability Assessment of Modulated Model Predictive Control
By Fernanda CARNIELUTTI [View]
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Abstract: This paper proposes a quadratic cost function for Modulated Model Predictive Control, M2PC, designedin a way such as to guarantee that the inverter under consideration will be stable for a desired steadystate operational condition, also considering parametric variations. The M2PC results in better harmonicperformance, less current ripple and less steady-state error when compared to the classical FCS-MPC.Hardware-in-the-Loop, HIL, results are presented comparing the performance of the implemented M2PCand a classical FCS-MPC for a two-level inverter connected to an RL load, considering the same costfunction. The HIL results have demonstrated the good performance of the proposed approach, showingthe stability and performance despite the model of the implemented M2PC.

   Exploring the Boundaries and Effects of the Discontinuous Conduction Mode in H-Bridge Inverter with Dead-time
By Qihao YU [View]
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Abstract: Dead-time of an H-bridge inverter can cause nonlinear error on the inverter output. In different switching cycles during a fundamental period, the effect of dead-time might be different. The H-bridge inverter in different switching cycles can operate in three kinds of modes, including soft-switching continuous conduction mode, discontinuous conduction mode and hard-switching continuous conduction mode. In addition, the discontinuous conduction mode can be further classified into four different types, which have not been fully studied in previous research. In this paper, four different kinds of switching cycle in the discontinuous conduction mode are investigated. The effect of the dead-time on the voltage error is elaborated and the boundaries of each kind of switching cycle are determined by a series of constraint functions. Based on the analysis, a complete mathematical expression of the voltage error in a fundamental period is given and it yields a better accuracy compared to previous publications.

   Multistep MPC of Dual Inverter for Switching Losses Optimization
By Martin VOTAVA [View]
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Abstract: A novel control method based on model predictive control (MPC) dedicated to dual inverter (DI) control with minimization of switching losses is introduced. Optimal compromise between switching losses and current tracking error is reached by enlarging of the predicted steps count. The computational burden is reduced by employing the sphere decoding algorithm (SDA).

EPE 2020 - LS2d: Converter Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - LS2d: Converter Control
	[return to parent folder]

	Comparison of Decoupling Techniques via Discrete Luenberger Style Observer for Voltage Oriented Control By Gyanendra Kumar SAH	[View] [Download]
Abstract: This work focuses on the implementation, analysis, and comparison of discrete-time synchronous framecurrent controllers for grid-connected three-phase VSIs using Discrete Luenberger Style Observers(DLSO) in both synchronous (dq), and stationary (aß) frames including the controller's computationaldelay compensation. Further, the unique cross-coupling effects of the voltages and currents in thediscrete domain are discussed. Pole-zero cancellation techniques are used for the tuning of the currentcontrollers. A discrete Phase-Locked Loop (PLL) with decoupled nonlinearities is proposed. For eachtopology, Frequency Response Function (FRF) plots and the step responses are obtained and analyzed.

	Cost Function Design for Stability Assessment of Modulated Model Predictive Control By Fernanda CARNIELUTTI	[View] [Download]
Abstract: This paper proposes a quadratic cost function for Modulated Model Predictive Control, M2PC, designedin a way such as to guarantee that the inverter under consideration will be stable for a desired steadystate operational condition, also considering parametric variations. The M2PC results in better harmonicperformance, less current ripple and less steady-state error when compared to the classical FCS-MPC.Hardware-in-the-Loop, HIL, results are presented comparing the performance of the implemented M2PCand a classical FCS-MPC for a two-level inverter connected to an RL load, considering the same costfunction. The HIL results have demonstrated the good performance of the proposed approach, showingthe stability and performance despite the model of the implemented M2PC.

	Exploring the Boundaries and Effects of the Discontinuous Conduction Mode in H-Bridge Inverter with Dead-time By Qihao YU	[View] [Download]
Abstract: Dead-time of an H-bridge inverter can cause nonlinear error on the inverter output. In different switching cycles during a fundamental period, the effect of dead-time might be different. The H-bridge inverter in different switching cycles can operate in three kinds of modes, including soft-switching continuous conduction mode, discontinuous conduction mode and hard-switching continuous conduction mode. In addition, the discontinuous conduction mode can be further classified into four different types, which have not been fully studied in previous research. In this paper, four different kinds of switching cycle in the discontinuous conduction mode are investigated. The effect of the dead-time on the voltage error is elaborated and the boundaries of each kind of switching cycle are determined by a series of constraint functions. Based on the analysis, a complete mathematical expression of the voltage error in a fundamental period is given and it yields a better accuracy compared to previous publications.

	Multistep MPC of Dual Inverter for Switching Losses Optimization By Martin VOTAVA	[View] [Download]
Abstract: A novel control method based on model predictive control (MPC) dedicated to dual inverter (DI) control with minimization of switching losses is introduced. Optimal compromise between switching losses and current tracking error is reached by enlarging of the predicted steps count. The computational burden is reduced by employing the sphere decoding algorithm (SDA).