EPE Association: EPE 2022 - LS4d: Power Electronics for Renewables

EPE 2022 - LS4d: Power Electronics for Renewables
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2022 - LS4d: Power Electronics for Renewables

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   Cooperative Control of Online Spectroscopy Impedance Monitoring Method and Maximum Power Point Tracking Method for Photovoltaic Panels
By Xin WANG [View]
[Download]

Abstract: Health monitoring is essential for the photovoltaic (PV) panels to improve the system's efficiency and stability. Existing health monitoring methods are applied either offline or need additional equipment. Impedance spectroscopy (IS) methods can characterize online the internal processes of electrochemical systems with corresponding equivalent circuit model. However, it is rarely used for PV panels. This paper focuses on the online implementation of IS based on existing power converter for real-time health monitoring of PV panels. The injection region and type of perturbation signal for PV panels during IS measuring are analyzed. Based on PV panel's equivalent circuit model, a theoretical analysis of the influence of temperature and irradiance on internal parameters is made. Besides, a cooperative control method of online IS method and maximum power point tracking (MPPT) method is proposed. Even during the IS measuring, the quasi-maximum output power of PV panels can be maintained. The feasibility of the proposed method is verified by both simulation and experiment under different operating conditions.

   Energy Storage Systems for Airborne Wind Generators
By Bakr BAGABER [View]
[Download]

Abstract: Several electrical drive concepts and control strategies for airborne wind energy systems are compared in this work. The results suggest that the proposed modified kite trajectory control and the parallel drive concept can indeed reduce the required silicon chip area and prolong the converter's lifetime without significantly impacting the overall system efficiency. The compromise is however, a higher system complexity and larger torque ripples which could impact the noise profile of the electrical machine. The investigation also reveals that the power converter size is influenced by the installation location and the associated wind class. Where installations around land agricultural areas have the biggest impact on the drive train because of the high wind turbulence.

   Evaluation of common-mode leakage current of Aalborg-type transformerless PV inverters
By Georgios ORFANOUDAKIS [View]
[Download]

Abstract: Single-phase transformerless photovoltaic (PV) inverters with voltage step-up capability are widely employed for integrating PV generation to the electric grid. Transformerless PV inverter topologies include special features to suppress common-mode (CM) leakage currents that can flow through parasitic capacitances that appear between the PV array and the ground. The Aalborg inverter belongs to the family of dual-mode time-sharing PV inverters, in which a voltage step-up (Boost) stage operates alternatively to a step-down (Buck) stage to create a rectified sine wave DC-link voltage, which is then unfolded to the grid. This paper analyses, quantifies and improves CM leakage current generation for Aalborg-type transformerless PV inverters. It highlights the factors that can lead to high peak and RMS values of leakage current for these topologies and proposes an output filter modification to reduce them by up to 70\%. The analytical results are supported by simulation in MATLAB-Simulink and are applicable to other topologies with rectified sine wave DC-link voltages.

EPE 2022 - LS4d: Power Electronics for Renewables
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2022 - LS4d: Power Electronics for Renewables
	[return to parent folder]

	Cooperative Control of Online Spectroscopy Impedance Monitoring Method and Maximum Power Point Tracking Method for Photovoltaic Panels By Xin WANG	[View] [Download]
Abstract: Health monitoring is essential for the photovoltaic (PV) panels to improve the system's efficiency and stability. Existing health monitoring methods are applied either offline or need additional equipment. Impedance spectroscopy (IS) methods can characterize online the internal processes of electrochemical systems with corresponding equivalent circuit model. However, it is rarely used for PV panels. This paper focuses on the online implementation of IS based on existing power converter for real-time health monitoring of PV panels. The injection region and type of perturbation signal for PV panels during IS measuring are analyzed. Based on PV panel's equivalent circuit model, a theoretical analysis of the influence of temperature and irradiance on internal parameters is made. Besides, a cooperative control method of online IS method and maximum power point tracking (MPPT) method is proposed. Even during the IS measuring, the quasi-maximum output power of PV panels can be maintained. The feasibility of the proposed method is verified by both simulation and experiment under different operating conditions.

	Energy Storage Systems for Airborne Wind Generators By Bakr BAGABER	[View] [Download]
Abstract: Several electrical drive concepts and control strategies for airborne wind energy systems are compared in this work. The results suggest that the proposed modified kite trajectory control and the parallel drive concept can indeed reduce the required silicon chip area and prolong the converter's lifetime without significantly impacting the overall system efficiency. The compromise is however, a higher system complexity and larger torque ripples which could impact the noise profile of the electrical machine. The investigation also reveals that the power converter size is influenced by the installation location and the associated wind class. Where installations around land agricultural areas have the biggest impact on the drive train because of the high wind turbulence.

	Evaluation of common-mode leakage current of Aalborg-type transformerless PV inverters By Georgios ORFANOUDAKIS	[View] [Download]
Abstract: Single-phase transformerless photovoltaic (PV) inverters with voltage step-up capability are widely employed for integrating PV generation to the electric grid. Transformerless PV inverter topologies include special features to suppress common-mode (CM) leakage currents that can flow through parasitic capacitances that appear between the PV array and the ground. The Aalborg inverter belongs to the family of dual-mode time-sharing PV inverters, in which a voltage step-up (Boost) stage operates alternatively to a step-down (Buck) stage to create a rectified sine wave DC-link voltage, which is then unfolded to the grid. This paper analyses, quantifies and improves CM leakage current generation for Aalborg-type transformerless PV inverters. It highlights the factors that can lead to high peak and RMS values of leakage current for these topologies and proposes an output filter modification to reduce them by up to 70\%. The analytical results are supported by simulation in MATLAB-Simulink and are applicable to other topologies with rectified sine wave DC-link voltages.