EPE Association: EPE 2020 - LS3c: PWM & Control Techniques

EPE 2020 - LS3c: PWM & Control Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 03: Measurement and Control > EPE 2020 - LS3c: PWM & Control Techniques

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   Adaptive Predictive-DPC for LCL-Filtered Grid Connected VSC with Reduced Number of Sensors
By Hosein GHOLAMI-KHESHT [View]
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Abstract: An adaptive predictive direct power control (P-DPC) method using a Luenberger observer is proposed in conjunction with conventional P-DPC, which reduces the system sensitivity to parameter mismatches and control delays. Moreover, the observer facilitates sensorless operation of the proposed method. The performance of the proposed adaptive P-DPC is confirmed under various simulation and experimental tests.

   Carrier-Based Modulated Model Predictive Control for Vienna Rectifiers
By Junzhong XU [View]
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Abstract: The implementation of traditional finite-control-set model predictive control (FCS-MPC) with variableswitching frequency in voltage source rectifiers (VSRs) can make the system suffer from poor currentharmonics performance. In fact, the resulting wide-spread voltage harmonic generated at the AC terminalsmakes the design of the typical multi-order AC filtering bulky and prone to control instabilities. Thispaper proposed a fixed frequency carrier-based modulated model predictive control (CB-MMPC) whichis able to overcome these issues. This control strategy aims to improve the total harmonic distortion(THD) of the AC current waveform without introducing any additional weight factor in the cost functionof the optimization routine, while maintaining the typical performance of fast current dynamic responseof the FCS-MPC. Herein, the detailed implementation of the proposed CB-MMPC is given, while consideringits application to the current feedback control loop of a three-phase three-level Vienna rectifier.Finally, PLECS based simulation results are used to verify the feasibility and the effectiveness of theproposed control strategy and to benchmark its performance to the classical FCS-MPC strategy and theconventional application of a current closed loop implementing a proportional-integral(PI)-controller.

   Effect of Unipolar and Bipolar SPWM on the Lifetime of DC-link Capacitors in Single-Phase Voltage Source Inverters
By Silpa BABURAJAN [View]
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Abstract: This paper explores the impact of different modulation techniques on the lifetime of DC-link capacitors for different modulation indices and varying operating power of voltage source inverter system. The conducted analysis show that the capacitor lifetime improves when using unipolar Sinusoidal pulse-width modulation (SPWM), which introduces the highest lifetime for DC-link capacitors when a single unit voltage source inverter is used. Likewise, for two paralleled voltage source inverter unit' topology, both units using unipolar SPWM, having the same switching frequency produces the least thermal stress on the capacitor and consequently giving the highest lifetime.

   On the Limitations of Using a LTI Modelling Approach for Control Tuning of VSC-HVDC Systems
By Pablo BRIFF [View]
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Abstract: This paper investigates the tuning methods of a High Voltage Direct Current (HVDC) Voltage Source Converter (VSC) system using double dq synchronous rotating reference frames. This work shows, and confirms by simulation results, that commonly used Linear Time-Invariant (LTI) tuning methods may lead to undesired behaviours when the underlying system is Linear Time-Periodic (LTP). In order to find the optimal tuning parameters, LTP system has been tuned using a machine learning method called Gradient Descent. As a result of this work, new LTP-based tuning methods may be used in the field of VSC-HVDC control.

EPE 2020 - LS3c: PWM & Control Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 03: Measurement and Control > EPE 2020 - LS3c: PWM & Control Techniques
	[return to parent folder]

	Adaptive Predictive-DPC for LCL-Filtered Grid Connected VSC with Reduced Number of Sensors By Hosein GHOLAMI-KHESHT	[View] [Download]
Abstract: An adaptive predictive direct power control (P-DPC) method using a Luenberger observer is proposed in conjunction with conventional P-DPC, which reduces the system sensitivity to parameter mismatches and control delays. Moreover, the observer facilitates sensorless operation of the proposed method. The performance of the proposed adaptive P-DPC is confirmed under various simulation and experimental tests.

	Carrier-Based Modulated Model Predictive Control for Vienna Rectifiers By Junzhong XU	[View] [Download]
Abstract: The implementation of traditional finite-control-set model predictive control (FCS-MPC) with variableswitching frequency in voltage source rectifiers (VSRs) can make the system suffer from poor currentharmonics performance. In fact, the resulting wide-spread voltage harmonic generated at the AC terminalsmakes the design of the typical multi-order AC filtering bulky and prone to control instabilities. Thispaper proposed a fixed frequency carrier-based modulated model predictive control (CB-MMPC) whichis able to overcome these issues. This control strategy aims to improve the total harmonic distortion(THD) of the AC current waveform without introducing any additional weight factor in the cost functionof the optimization routine, while maintaining the typical performance of fast current dynamic responseof the FCS-MPC. Herein, the detailed implementation of the proposed CB-MMPC is given, while consideringits application to the current feedback control loop of a three-phase three-level Vienna rectifier.Finally, PLECS based simulation results are used to verify the feasibility and the effectiveness of theproposed control strategy and to benchmark its performance to the classical FCS-MPC strategy and theconventional application of a current closed loop implementing a proportional-integral(PI)-controller.

	Effect of Unipolar and Bipolar SPWM on the Lifetime of DC-link Capacitors in Single-Phase Voltage Source Inverters By Silpa BABURAJAN	[View] [Download]
Abstract: This paper explores the impact of different modulation techniques on the lifetime of DC-link capacitors for different modulation indices and varying operating power of voltage source inverter system. The conducted analysis show that the capacitor lifetime improves when using unipolar Sinusoidal pulse-width modulation (SPWM), which introduces the highest lifetime for DC-link capacitors when a single unit voltage source inverter is used. Likewise, for two paralleled voltage source inverter unit' topology, both units using unipolar SPWM, having the same switching frequency produces the least thermal stress on the capacitor and consequently giving the highest lifetime.

	On the Limitations of Using a LTI Modelling Approach for Control Tuning of VSC-HVDC Systems By Pablo BRIFF	[View] [Download]
Abstract: This paper investigates the tuning methods of a High Voltage Direct Current (HVDC) Voltage Source Converter (VSC) system using double dq synchronous rotating reference frames. This work shows, and confirms by simulation results, that commonly used Linear Time-Invariant (LTI) tuning methods may lead to undesired behaviours when the underlying system is Linear Time-Periodic (LTP). In order to find the optimal tuning parameters, LTP system has been tuned using a machine learning method called Gradient Descent. As a result of this work, new LTP-based tuning methods may be used in the field of VSC-HVDC control.